CA2127743A1 - Method and composition for enhancing hydrocarbon production from wells - Google Patents
Method and composition for enhancing hydrocarbon production from wellsInfo
- Publication number
- CA2127743A1 CA2127743A1 CA002127743A CA2127743A CA2127743A1 CA 2127743 A1 CA2127743 A1 CA 2127743A1 CA 002127743 A CA002127743 A CA 002127743A CA 2127743 A CA2127743 A CA 2127743A CA 2127743 A1 CA2127743 A1 CA 2127743A1
- Authority
- CA
- Canada
- Prior art keywords
- concentrate
- well
- carrier
- percent
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/927—Well cleaning fluid
- Y10S507/929—Cleaning organic contaminant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/927—Well cleaning fluid
- Y10S507/929—Cleaning organic contaminant
- Y10S507/93—Organic contaminant is asphaltic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/927—Well cleaning fluid
- Y10S507/929—Cleaning organic contaminant
- Y10S507/931—Organic contaminant is paraffinic
Abstract
ABSTRACT
A concentrate for use with an oil or water carrier for injection into a well to enhance production and a method of well treatment are disclosed. The five part concentrate contains xylene, an aliphatic hydrocarbon solvent such as kerosene, a non-ionic emulsifier, a non-ionic surfactant and an amphoteric detergent. The xylene and kerosene create a solvent hole in the materials restricting flow. The surfactant expands the holes while the detergent and emulsifier assist in dispersing the removed material to thereby stimulate production from the well. The injection of the concentrate and carrier mixture can take place during shut-in of the well or during continued production.
A concentrate for use with an oil or water carrier for injection into a well to enhance production and a method of well treatment are disclosed. The five part concentrate contains xylene, an aliphatic hydrocarbon solvent such as kerosene, a non-ionic emulsifier, a non-ionic surfactant and an amphoteric detergent. The xylene and kerosene create a solvent hole in the materials restricting flow. The surfactant expands the holes while the detergent and emulsifier assist in dispersing the removed material to thereby stimulate production from the well. The injection of the concentrate and carrier mixture can take place during shut-in of the well or during continued production.
Description
21277~3 "-' , (.,.' METHOD AND COMPOSITION FOR ENHANCING HYDROCARBON
PRODUCTION FROM WELLS
BACKGR~)UND OF THE IN~ENTION
This invention relates to the enhancement of production from oi] and gas wells by tlle removal of material such as wax and scale which tend to plug the well ~nd retard the flow of hydrocarbons from the production zone.
The presence of flow restrictions in oil and gas wells which tend to reduce the production rate over a period of time is a problem that has long plagued the production industry. Typically, the fluid ~lowing iiom the production zone leaves solid residues, both inorganic and organic, in the portion of the formation proximate the well and in the tubing, piping, valves and the like which form the well structure.
.
The deposits common to fluid hydrocarbon production are comprised not only of the hydrocarbon chains characteristic of paraffin and wax, but also include other : . , ~ .
1~ components such as water, rust, clay, and additional hydrocarbon compounds. Buildup within the formation, at the production face and within the well equipment occurs over a period of time and can be characterized by a composition that can vary with time. In addition, the production retarding buildup contains materials *om the interleaved and adjacent formations. As a result, the l emoval of production-reducillg buildup by chemical '~Q methods is difflGult and often unpredictable. Specific treating agents such as xylene are known to dissolve asphaltenes and paraffins, but have limited effectiveness on buildup deposits containing inorganic materials. Furthermore, some organic solvents are ineffective , ~ ~ : . : .
21277~3 with asphaltenes. In U.S. Pat. No. 3,~37,146 a process for removing paraffin deposits from a producing well utilizes the injection of heated ~ylene to enhance productio~.
Since the use of a single agent is likely to be effective only in specific instances which are empirically detelmined through field testing, the use of ~ combination of 5 ingredients to treat solid phase hydrocarbons that are built up around the face of the producing formation has been advocated. For example, a method relying on the injection of an oil and water emulsion in combination with an inert ~,as and surface active agents to promote removal of the buildup is described in U.S. Pat. No. ~,775,~89. Another e:Yample of the use of a combination of ingredients is the multi-purpose solvent for the removal of production-reducing bui]dup in the well described in U.S. Pat. No. 3,L~02,770 wherein xylene is combined with an acid and a liquid having mutual solubility for oil and watel. The liquid is either an alcohol or an ether. The three components are mixed and injected into the well and after a period of time removed along~ with dissolved materials. The recommended organic solvent is carbon disulfide with benzene and xylene cited as alternative solvents.
15 The objective of this reference is to provide a single phase liquid that can be tested on site and its composition then adjusted based on local conditions. 1 he three component solvent is stated to dissolve both organic accumulations, such as oil and asphalt, as well as inorganic accumulations such as scale or silt. The reference s~ates that the acids are required for the dissolution of the inorganic deposits. Byproducts folmed as a result of the reaction 2Q bet~,veen the oil and the acid are retained in solution according to the reference to limit interference with the. elimination of the production-reducing buildup. The reference further states that other additives such as detergents, surfactants or deemulsifiers can be - , , ~
, . . , . . - ..
PRODUCTION FROM WELLS
BACKGR~)UND OF THE IN~ENTION
This invention relates to the enhancement of production from oi] and gas wells by tlle removal of material such as wax and scale which tend to plug the well ~nd retard the flow of hydrocarbons from the production zone.
The presence of flow restrictions in oil and gas wells which tend to reduce the production rate over a period of time is a problem that has long plagued the production industry. Typically, the fluid ~lowing iiom the production zone leaves solid residues, both inorganic and organic, in the portion of the formation proximate the well and in the tubing, piping, valves and the like which form the well structure.
.
The deposits common to fluid hydrocarbon production are comprised not only of the hydrocarbon chains characteristic of paraffin and wax, but also include other : . , ~ .
1~ components such as water, rust, clay, and additional hydrocarbon compounds. Buildup within the formation, at the production face and within the well equipment occurs over a period of time and can be characterized by a composition that can vary with time. In addition, the production retarding buildup contains materials *om the interleaved and adjacent formations. As a result, the l emoval of production-reducillg buildup by chemical '~Q methods is difflGult and often unpredictable. Specific treating agents such as xylene are known to dissolve asphaltenes and paraffins, but have limited effectiveness on buildup deposits containing inorganic materials. Furthermore, some organic solvents are ineffective , ~ ~ : . : .
21277~3 with asphaltenes. In U.S. Pat. No. 3,~37,146 a process for removing paraffin deposits from a producing well utilizes the injection of heated ~ylene to enhance productio~.
Since the use of a single agent is likely to be effective only in specific instances which are empirically detelmined through field testing, the use of ~ combination of 5 ingredients to treat solid phase hydrocarbons that are built up around the face of the producing formation has been advocated. For example, a method relying on the injection of an oil and water emulsion in combination with an inert ~,as and surface active agents to promote removal of the buildup is described in U.S. Pat. No. ~,775,~89. Another e:Yample of the use of a combination of ingredients is the multi-purpose solvent for the removal of production-reducing bui]dup in the well described in U.S. Pat. No. 3,L~02,770 wherein xylene is combined with an acid and a liquid having mutual solubility for oil and watel. The liquid is either an alcohol or an ether. The three components are mixed and injected into the well and after a period of time removed along~ with dissolved materials. The recommended organic solvent is carbon disulfide with benzene and xylene cited as alternative solvents.
15 The objective of this reference is to provide a single phase liquid that can be tested on site and its composition then adjusted based on local conditions. 1 he three component solvent is stated to dissolve both organic accumulations, such as oil and asphalt, as well as inorganic accumulations such as scale or silt. The reference s~ates that the acids are required for the dissolution of the inorganic deposits. Byproducts folmed as a result of the reaction 2Q bet~,veen the oil and the acid are retained in solution according to the reference to limit interference with the. elimination of the production-reducing buildup. The reference further states that other additives such as detergents, surfactants or deemulsifiers can be - , , ~
, . . , . . - ..
2~27743 ~ . (..
added to the solvent to aid in keeping all the materials in solution. As noted in the references, this composition requires an acid and therefore tends to corrode all the metal ~
parts and piping that it encounters. Furthermore, tbe use of quantities of acid being ~ -pumped into a well is likely to encounter environmental objections and is to be avoided. --5 In applications where the chemical treatments contain hazardous materials or are incompatible with the subsequent processing equipment, considerable attention is directed to the recovery and handling of the treatment fluid.
:..- .. :
Accordingly, a major objective of the present invention is the provision of a well .
treatment fluid to provide enhanced production rates fiom oil and gas wells without 10 requirill~ the use o~ acid components or other potentially hazardous materials. In addition, ., . ~ .
the present composition and the method of applying same to a well can be utilized effectively ~o remove hydrocarbon-based and water-based solids in the well. Further, the present invention provides a concentrate that can be utilized with either a water or oil carrier. The components of the concentrate are compatible with typical downstream 1~ processin;, techniques so that segregation and separate recovely oe the well treatment fluid . . .
after treatment is not required. Tlius, the need for separate disposal of the fluid is .:: .
obviated.
: . -: .
SUMMARY OF THE INVENTION
~0 The enllancement of production from oil and gas wells obtained by the practice of the present invention is provided by the addition of a concen~rate to a carrier ~uid. 'rhe combination is injected into the well. The injection can be completed in a short interval - ( 2~277~3 when the well is rendered nonproductive or can occur concurrently with production over a longer peliod of time.
The concentrate of the present invention comprises five components. One component is an aromatie hydrocarbon component containing one or more isomers of S xylene. The ability of xylene to promote the solubilizing of complex hydrocarbons from the solid phase is recognized. The xylene component provides the initial interaction of the treatment fluid with the solid buildup by establishing an attraction bond at the surface of , the solid phase hydrocarbons found in the fo~nation and well.
The second component is an aliphatic hydrocarbon solvent which is found to expand 10 the softening or solution effect of the Yylene when the hydrocarbon deposit has been penetrated by the Yylene. During use, the surfaces of the plugging material are partly dissolved to eYpose additional material and are found to be softened by the eombination of the xylene and aromatic hydrocarbon. The extended chain of the aliphatic hydrocarbon solvent is responsible for the continued solution of the complex hydrocarbons in the 15 plugged material. In general, the higher the molecular weight of the aliphatic hydrocarbon solvent, the ;,reater the absolptive quality for the hydrocarbon deposit dissolved by the xylene. The xylene and aliphatic hydrocarbon solvent are both present in the concentrate in the range of 20 to 60 percent by weight.
The concentrate further includes an amphoteric amide detergent which aids in the ~0 solution of hydrophobie and hydrophilic molecules into each other. The detergent continues the dissolution of the hydrocarbons so that they may be removed from proximity to the surface of ~he deposit. This component is a link in the sequence of aetivity at the .
21 27(~43 continually eroding surface o the deposit that takes an insoluble hydrocarbon to a carrier molecule and out of the formation. Il~e detergent is present in the concentrate in the range of 2 to 10 percent by weight. The fourth component of the concentrate is a non~
ionic sulfactant, such as sorbitan monooleate which is soluble in most oils and assists in the solution of the hydrocarbons into the carrier. In the case of a water carrier for the concentrate or formations that contain significant amounts of water, this component works with the detergent and a non-ionic emulsifier to trap hydrocarbons in a disbursed and soluble form for transport out of the fonnation. In the case of an oi1 carrier, the transport of the disbursed hydrocarbon molecules occurs through the action of the hydrocarbon carrier. However, in cases where a water carrier is used, the solubilized mass is disbursed via an emulsion augmented by the effect of the cletergent and surfactant. The non-ionic surfactant is present in the range of ~ to 10 percent by weight of concentlate.
The final link in the chain of events that places the ~ormation-plugging deposits into a physical state that allows their transport out of the formation via the oil or water carrier is the fifth component, a non-ionic emulsifier. The emulsifier is present in the range of 10 to 30 percent by weight of the concentrate. The emulsifier permits the hydrocarbons that have been removed fiom the solid phase to move into the water carrier. The emulsifier :
maintains ~he removed hydrocarbon molecules in suspension or solution until removal from :
the local environment proximate to the surface of the deposit.
The five components of the concentrate complement each other in attacking and dissolving forrnation plugs and softening scale buildup causing it to break fiee to thereby increase the flow of product from an oil or gas producing zone of formation. FuIthermore, S
, .
21277~3 the concentrate provides a coating on e~posed surfaces of the well structure which reduces the rate at wbich scale builds up during resumed production. The concentrate also reduces surface tension to enhance flow during resumed production. These effects persist for a period during resumed production thereby increasing the intelval between treatments. In general, the steps of the process include first detelrnining the type of deposited material plugging the well or the acljacent region of the production zone. After obtaining the information, a selection is made between an oil or water carrier. The concentrate is then added to the selected carrier and the combination is injected into the well. In cases where thele are high levels of oil sludge ol paraffil1s, the carrier utilized is oil, preferably heated.
However, if there is a high level of nliYed scales and water~based sludves, thén the carrie1 is water, preferably heated. The concentrate is folmulated in a basic miYture and separately contained.
The present invention utilizes materials having a low level of environmental danger.
The solvents utilized possess a higher flash point than many hydrocarbon solvents, such as carbon disulfide, recommended by one of the cited references for use in well trea~nent.
The aliphatic hydrocarbon solvent is nolmally chosen for low flammability and cost, which favors kerosene. The remaining three constituents of the concentrate are generally recognized not to pose environmental problems. It is significant that the present invention does not require that large quantities of acid be handled and later injected into the well.
Further features and advantages of the invention will become more readily apparent from the following detailed description of preferred embodiments.
6 ~ -2~2'774~
DESCRIPTION OF PREFERRED EMBODIMENTS
The present invention is directed to a composition for treating hydrocarbon producing wells and the surrounding folmation and the method of providing the treatment.
The composition in the form of a concentrate is mixed with an oil or water carrier based 5 on the nature of the down hole accumulations retarding production from the well. The mLxtule is injected into the well to reduce the impediments to production. After the mixture is pumped into the well and the adjacent fonnatioll, the well is shut-in and the mixture begins to take action on the accumulations. After a period of twenty-four to seventy-two hours, the well is allowed to flow back since the injected ~uid mixture is 10 captured through the production process. The well is brought into production at an enhanced production rate.
111e concentrate of the present invention is comprised of five constituents each of which takes an interactive part in the breakdown and removal of solid buildup from the well and the adjacent portion of the folmation. The buildup of solid material can include 15 paraffins and oil sludge as well as scale and water soluble sludge based on the composition of the hydrocarbon being produced, the nature of the producing folmation, and the I)resence of layers of different material in the fol~nation. The concentrate of the present invention is added to different carriers based on an initial analysis of the nature of the conditions at the well.
~0 The concentrate includes an aromatic hydrocarbon solvent containing at least one isomer of xylene in the range of 20 to 60 percent by weight. The properties of xylene as a hydrocarbon solvent are that it is aggressive in making an initial penetration of 21277~3 hydrocarbon-bàsed solid buildup. Xylene has three isomers; ortho, meta and para, based on the position of the CH3 groups orl the benzene ring which structurally characterizes the compound. The present invention utilizes one or more of the isomers of xylene with essentially the same beneficial results being attained.
The xylene component aids in establishing an attraction bond between the surface of the solid hydrocarbon found in the formulation and the other components of the concentrate. These solids can include coal, carbonaceous shale, asphalt, oil shale, paraffins, waxes, tar and oil sands and ~eologically-entrained materials. The xylenes begin the solution of complex hydrocarbons by interacting with the wide molecular spacing found in 10 most solid phase hydrocarbons. In addition, the xylenes ale partly soluble in water so as to be compatible with different types of carriers.
The second component of the concentrate is an aliphatic hydroc~rbon solvent, such as kerosene, gasoline and diesel fuel. This component is present in the concentrate in the range of 20 to 60 percent by weight. The aliphatic solvent is a mrxture of straight chain 15 and branched chain hydrocarbons and provides for tbe continued solution of the complex hydrocarbons initially penetrated and softened by the xylene component. After the initial action of the xylene to penetrate and soften the solid hydrocarbon buildup, the aliphatic solvent then further dissolves and softens the pluggiDg material. The use of kerosene as the aliphatic solvent is preferred due to its low flammability and low cost. The higher ~0 molecular weight oils are preferred for use as a hydrocarbon carrier !to provide the adsorption of dissolved hydrocarboDs.
21277~
While xylenes are known to be useful in well treatment and the solvent properties of kerosene have been recognized, the combination of the xylene and the aliphatic solvent are found to provide enhanced action in this environment when used with the remaining three components of the concentrate which selve to disperse, suspend and emulsify the hydrocarbons for removal fiom the formation and the well.
The dispersion of the removed hydrocarbon molecules is aided by the third component which is a cocoamide detergent present in the range of 2 to 10 percent by ,. wei;,ht. The component is designated cocoamide diethylamine or DEA and is avai]able commercially as monoamid 3-~OA. The detergent is amphoteric in that it is soluble in both water and oil and promotes the dissolution of hydrophobic and hydrophilic molecules into each other. The hydrocarbons dissolved from the folmation and the solid hydrocarbo buildup are dissolved or dispersed into the more charged phase which can be the aromatic Yylene phase ol the water phase. The amide detergent continues the dissolution Oe the hydrocarbons so that the molecules are rernoved fiom the solid phase being treated.
The cocoamide DEA is one of the five active elements that cooperate to take an insoluble hydrocarbon to the carrier and out of the formation and well. The final removal is produced by the action of this detergent molecule in combination with that of the remaining two components: a nonionic surfactant and a nonionic emulsifier. Each component is present in the range of 2 to 10 percent by weight of the concentrate.
The nonionic s;lrfactant is sorbitan monooleate. This surfactant is highly soluble in most oils and assists in the solution of many types of hydrocarbons into oil-based carriers.
The chief task of this component is to assist in the dispersion of the organic material that 21277~
(, has been solubilized by the xylenes, kerosene or other aliphatic solvent and the cocoamide DEA into a nonpolar region in the carrier. The dispersion of these molecules facilitates their transport out of the formation by an oil-based carrier. In the situation where a water-based carrier is used or the producing folmation being treated contains significant amounts of water, the surfactant molecule works in combination with the deter,,ent and ernulsifying components to trap oil and other hydrocarbon molecules iIl a dispersed solubilized form for transport. By employing a heated water-based carrier the solubilized mass is dispersed . via an emulsion/solution augmented by the detergent and surfactant effects of the two other constituents.
The fifth component of the concentrate is a nonionic emulsifier which provides the final link in the series of reaction events that causes the formation-plugging materials, both charged and unchalged molecules, to reach a pllysical state tbat permits transport thereof via the oil or water based c~rriers. The nonionic emulsifier is polysorbate 80 which is sorblc acid with eighty units of polymer as defined in the Merck Inde~ th Edition.
The polysorbate ~0 component is water soluble and enables the hydrocarbon molecules that have been removed from the solid phase to move into a water-based or other charged solution. The molecules once freed from the surface that they have adhered to are kept in suspension or solution until removed from the region proximate to the producing folmation. Furthermore, the emulsifier selves as an antifoaming agent to aid 20 in the removal of the carrier and the entrained materials ~om the for~nation and well.
In use, the components of the concentrate begin to dissolve folmation plugs and increase flow from the production zone by a cooperative action which begins with the initial ~: ~
~,. "~ ~, -.. ..
.
.
2.t277~3 "
. . .
(~ ( penetration of the ~ylenes followed by softening and partial dissolution by the aliphatic .
solvent such as kerosene. In addition, the concentrate acts to soften scale causing it to break free from its substrate and be dispersed in the carrier fluid. The concentrate provides a residual coating on the well structure which selves to retard subsequent scale S buildup. By exposina the surfaces of the production-limiting material to the combined action of the detergent and surfactant, the hydlocarbon molecules move fiom the surface of the mass and they become suspended by the emulsifier in the carrier. ~e benefits of the novel combination of components in the concentrate in removing hydrocarbon solid reducing scale deposits and reducing surf<lce tension are apparent from the following results 10 of the injection of the present concentrate and carlier into limited prodllction wells.
E:~ample I
Gas Well - San Juan County, New Mexico Picture Cliff Folmation Prior Production Rate 317 MCF/day After Treatment 509 ~lCF/day ~0 :. --: '.' EYample II ;
Oil and Gas Well ~5 Sandoval County, New Mexico Dakota Folmation Prior Production Rate 51 MCF/day ! .
6.5 Bbl/day .
After Treatment 81 MCF/day 9.5 Bbl/day ''' ~ ~ :' -, ` 21277~3 ' E:cample III
Gas and Oil Well Rio AlTiba County, New MeYico S Mesa Verde Folmation - Prior Production Rate 3Z3 ~ICF/day ~.8 BbL/day : ` ' ' ' After Treatment ~38 MCF/day 6.1 Bbl/day 15. Example IV
Oil and Gas Well Rio Arriba County, New Me:cico Gallup Formation Prior Production Rate 32 l\~lCF/day 3.1 Bbl/day After Treatment ~S MCF/day 6.7 Bbl/day '~5 The concentrate used in the above-noted test had the following composition by weight: sorbitan monooleate and cocoamide DEA ~.6C/~, xylene 36.3C/t., kerosene 36.3~ and polysorbate ~0 at 13.~Yc.
The composition is prepared as a miYtule of the components which produces a c~ear 30 solution or a partially turbid solution based on the relative ranges of the ingredients. There is no known chemical reaction between the ingredients themselves so that the concentrate .is stable in the container. No special packaging techniques need be employed to contain the concentrate. Since the concentrate is separately contained, it is normally transported to the well site for addition to the carrier fluid. ~he preferred mrxture is about a fifty^five 35 to 1 ratio or 1 ~allon of concentrate to a barrel of carrier fluid.
17 ~ .
.. . , ~ : . . .
2~2~7743 (, Plior to the addition of the concentrate to the carrier fluid, determiDatiorl is made of the type of material plugging the well or production zone and the chemical composition of the produced oil and gas. This allows the selection of an appropriate oil-based or water-based carr;er fluid for the well treatment. For example, if the test show a predominance 5 of paraffins, waxes and oil sludges the selection of a heated oil carlier is indicated with additional emulsifier added. Should the tests sllow a high level of mixed scales and water based sludges then a heated water-based carrier with high levels of detergents and surfactants is indicated. As mentioned, the concentrate can be mixed in a standard compositional range for a particular prodllcing area w~th the additions and adjustments 10 made in the field if deemed necessaly.
The selected carrier is deliveled to the wellsite in a conventional "hot oil" truck which can provide a heated carrier fluid. The best results have been attained with a heated mixture of about 175 degrees F. The concentrate is added to the carrier in the "hot oil"
pumper truck. The tmck is then connected to the well and the mixture is forced down the 1~ well and into the surrounding region of the producing formation.
After the working mixture is pumped in, the well is shllt off and the mixture allowed to react with the materials in the collection system and the geological formation for up to .: ~
96 hours. Then, the well is allowed to flow back and the injected fluids ~re included in the production stream and normally passed to the subsequent processing facility. As shown by 20 the examples, the well is brought back into production at an enhanced rate. Normally, the process is repeated when production again drops to the operator's economic cut-off level.-However, should the well prove difficult to treat or the production rate be found to rapidly 2.~.27rl~ ~?
drop, the mrxture can be injected into the well at a low daily rate to reduce the rate at which production falls through buildup of plugving material.
While the above description has referred to a range of embodiments, it is to be noted that v~riations may be made therein without departing ~rom the scope of the .;
5 invention as claimed. - .
1~
added to the solvent to aid in keeping all the materials in solution. As noted in the references, this composition requires an acid and therefore tends to corrode all the metal ~
parts and piping that it encounters. Furthermore, tbe use of quantities of acid being ~ -pumped into a well is likely to encounter environmental objections and is to be avoided. --5 In applications where the chemical treatments contain hazardous materials or are incompatible with the subsequent processing equipment, considerable attention is directed to the recovery and handling of the treatment fluid.
:..- .. :
Accordingly, a major objective of the present invention is the provision of a well .
treatment fluid to provide enhanced production rates fiom oil and gas wells without 10 requirill~ the use o~ acid components or other potentially hazardous materials. In addition, ., . ~ .
the present composition and the method of applying same to a well can be utilized effectively ~o remove hydrocarbon-based and water-based solids in the well. Further, the present invention provides a concentrate that can be utilized with either a water or oil carrier. The components of the concentrate are compatible with typical downstream 1~ processin;, techniques so that segregation and separate recovely oe the well treatment fluid . . .
after treatment is not required. Tlius, the need for separate disposal of the fluid is .:: .
obviated.
: . -: .
SUMMARY OF THE INVENTION
~0 The enllancement of production from oil and gas wells obtained by the practice of the present invention is provided by the addition of a concen~rate to a carrier ~uid. 'rhe combination is injected into the well. The injection can be completed in a short interval - ( 2~277~3 when the well is rendered nonproductive or can occur concurrently with production over a longer peliod of time.
The concentrate of the present invention comprises five components. One component is an aromatie hydrocarbon component containing one or more isomers of S xylene. The ability of xylene to promote the solubilizing of complex hydrocarbons from the solid phase is recognized. The xylene component provides the initial interaction of the treatment fluid with the solid buildup by establishing an attraction bond at the surface of , the solid phase hydrocarbons found in the fo~nation and well.
The second component is an aliphatic hydrocarbon solvent which is found to expand 10 the softening or solution effect of the Yylene when the hydrocarbon deposit has been penetrated by the Yylene. During use, the surfaces of the plugging material are partly dissolved to eYpose additional material and are found to be softened by the eombination of the xylene and aromatic hydrocarbon. The extended chain of the aliphatic hydrocarbon solvent is responsible for the continued solution of the complex hydrocarbons in the 15 plugged material. In general, the higher the molecular weight of the aliphatic hydrocarbon solvent, the ;,reater the absolptive quality for the hydrocarbon deposit dissolved by the xylene. The xylene and aliphatic hydrocarbon solvent are both present in the concentrate in the range of 20 to 60 percent by weight.
The concentrate further includes an amphoteric amide detergent which aids in the ~0 solution of hydrophobie and hydrophilic molecules into each other. The detergent continues the dissolution of the hydrocarbons so that they may be removed from proximity to the surface of ~he deposit. This component is a link in the sequence of aetivity at the .
21 27(~43 continually eroding surface o the deposit that takes an insoluble hydrocarbon to a carrier molecule and out of the formation. Il~e detergent is present in the concentrate in the range of 2 to 10 percent by weight. The fourth component of the concentrate is a non~
ionic sulfactant, such as sorbitan monooleate which is soluble in most oils and assists in the solution of the hydrocarbons into the carrier. In the case of a water carrier for the concentrate or formations that contain significant amounts of water, this component works with the detergent and a non-ionic emulsifier to trap hydrocarbons in a disbursed and soluble form for transport out of the fonnation. In the case of an oi1 carrier, the transport of the disbursed hydrocarbon molecules occurs through the action of the hydrocarbon carrier. However, in cases where a water carrier is used, the solubilized mass is disbursed via an emulsion augmented by the effect of the cletergent and surfactant. The non-ionic surfactant is present in the range of ~ to 10 percent by weight of concentlate.
The final link in the chain of events that places the ~ormation-plugging deposits into a physical state that allows their transport out of the formation via the oil or water carrier is the fifth component, a non-ionic emulsifier. The emulsifier is present in the range of 10 to 30 percent by weight of the concentrate. The emulsifier permits the hydrocarbons that have been removed fiom the solid phase to move into the water carrier. The emulsifier :
maintains ~he removed hydrocarbon molecules in suspension or solution until removal from :
the local environment proximate to the surface of the deposit.
The five components of the concentrate complement each other in attacking and dissolving forrnation plugs and softening scale buildup causing it to break fiee to thereby increase the flow of product from an oil or gas producing zone of formation. FuIthermore, S
, .
21277~3 the concentrate provides a coating on e~posed surfaces of the well structure which reduces the rate at wbich scale builds up during resumed production. The concentrate also reduces surface tension to enhance flow during resumed production. These effects persist for a period during resumed production thereby increasing the intelval between treatments. In general, the steps of the process include first detelrnining the type of deposited material plugging the well or the acljacent region of the production zone. After obtaining the information, a selection is made between an oil or water carrier. The concentrate is then added to the selected carrier and the combination is injected into the well. In cases where thele are high levels of oil sludge ol paraffil1s, the carrier utilized is oil, preferably heated.
However, if there is a high level of nliYed scales and water~based sludves, thén the carrie1 is water, preferably heated. The concentrate is folmulated in a basic miYture and separately contained.
The present invention utilizes materials having a low level of environmental danger.
The solvents utilized possess a higher flash point than many hydrocarbon solvents, such as carbon disulfide, recommended by one of the cited references for use in well trea~nent.
The aliphatic hydrocarbon solvent is nolmally chosen for low flammability and cost, which favors kerosene. The remaining three constituents of the concentrate are generally recognized not to pose environmental problems. It is significant that the present invention does not require that large quantities of acid be handled and later injected into the well.
Further features and advantages of the invention will become more readily apparent from the following detailed description of preferred embodiments.
6 ~ -2~2'774~
DESCRIPTION OF PREFERRED EMBODIMENTS
The present invention is directed to a composition for treating hydrocarbon producing wells and the surrounding folmation and the method of providing the treatment.
The composition in the form of a concentrate is mixed with an oil or water carrier based 5 on the nature of the down hole accumulations retarding production from the well. The mLxtule is injected into the well to reduce the impediments to production. After the mixture is pumped into the well and the adjacent fonnatioll, the well is shut-in and the mixture begins to take action on the accumulations. After a period of twenty-four to seventy-two hours, the well is allowed to flow back since the injected ~uid mixture is 10 captured through the production process. The well is brought into production at an enhanced production rate.
111e concentrate of the present invention is comprised of five constituents each of which takes an interactive part in the breakdown and removal of solid buildup from the well and the adjacent portion of the folmation. The buildup of solid material can include 15 paraffins and oil sludge as well as scale and water soluble sludge based on the composition of the hydrocarbon being produced, the nature of the producing folmation, and the I)resence of layers of different material in the fol~nation. The concentrate of the present invention is added to different carriers based on an initial analysis of the nature of the conditions at the well.
~0 The concentrate includes an aromatic hydrocarbon solvent containing at least one isomer of xylene in the range of 20 to 60 percent by weight. The properties of xylene as a hydrocarbon solvent are that it is aggressive in making an initial penetration of 21277~3 hydrocarbon-bàsed solid buildup. Xylene has three isomers; ortho, meta and para, based on the position of the CH3 groups orl the benzene ring which structurally characterizes the compound. The present invention utilizes one or more of the isomers of xylene with essentially the same beneficial results being attained.
The xylene component aids in establishing an attraction bond between the surface of the solid hydrocarbon found in the formulation and the other components of the concentrate. These solids can include coal, carbonaceous shale, asphalt, oil shale, paraffins, waxes, tar and oil sands and ~eologically-entrained materials. The xylenes begin the solution of complex hydrocarbons by interacting with the wide molecular spacing found in 10 most solid phase hydrocarbons. In addition, the xylenes ale partly soluble in water so as to be compatible with different types of carriers.
The second component of the concentrate is an aliphatic hydroc~rbon solvent, such as kerosene, gasoline and diesel fuel. This component is present in the concentrate in the range of 20 to 60 percent by weight. The aliphatic solvent is a mrxture of straight chain 15 and branched chain hydrocarbons and provides for tbe continued solution of the complex hydrocarbons initially penetrated and softened by the xylene component. After the initial action of the xylene to penetrate and soften the solid hydrocarbon buildup, the aliphatic solvent then further dissolves and softens the pluggiDg material. The use of kerosene as the aliphatic solvent is preferred due to its low flammability and low cost. The higher ~0 molecular weight oils are preferred for use as a hydrocarbon carrier !to provide the adsorption of dissolved hydrocarboDs.
21277~
While xylenes are known to be useful in well treatment and the solvent properties of kerosene have been recognized, the combination of the xylene and the aliphatic solvent are found to provide enhanced action in this environment when used with the remaining three components of the concentrate which selve to disperse, suspend and emulsify the hydrocarbons for removal fiom the formation and the well.
The dispersion of the removed hydrocarbon molecules is aided by the third component which is a cocoamide detergent present in the range of 2 to 10 percent by ,. wei;,ht. The component is designated cocoamide diethylamine or DEA and is avai]able commercially as monoamid 3-~OA. The detergent is amphoteric in that it is soluble in both water and oil and promotes the dissolution of hydrophobic and hydrophilic molecules into each other. The hydrocarbons dissolved from the folmation and the solid hydrocarbo buildup are dissolved or dispersed into the more charged phase which can be the aromatic Yylene phase ol the water phase. The amide detergent continues the dissolution Oe the hydrocarbons so that the molecules are rernoved fiom the solid phase being treated.
The cocoamide DEA is one of the five active elements that cooperate to take an insoluble hydrocarbon to the carrier and out of the formation and well. The final removal is produced by the action of this detergent molecule in combination with that of the remaining two components: a nonionic surfactant and a nonionic emulsifier. Each component is present in the range of 2 to 10 percent by weight of the concentrate.
The nonionic s;lrfactant is sorbitan monooleate. This surfactant is highly soluble in most oils and assists in the solution of many types of hydrocarbons into oil-based carriers.
The chief task of this component is to assist in the dispersion of the organic material that 21277~
(, has been solubilized by the xylenes, kerosene or other aliphatic solvent and the cocoamide DEA into a nonpolar region in the carrier. The dispersion of these molecules facilitates their transport out of the formation by an oil-based carrier. In the situation where a water-based carrier is used or the producing folmation being treated contains significant amounts of water, the surfactant molecule works in combination with the deter,,ent and ernulsifying components to trap oil and other hydrocarbon molecules iIl a dispersed solubilized form for transport. By employing a heated water-based carrier the solubilized mass is dispersed . via an emulsion/solution augmented by the detergent and surfactant effects of the two other constituents.
The fifth component of the concentrate is a nonionic emulsifier which provides the final link in the series of reaction events that causes the formation-plugging materials, both charged and unchalged molecules, to reach a pllysical state tbat permits transport thereof via the oil or water based c~rriers. The nonionic emulsifier is polysorbate 80 which is sorblc acid with eighty units of polymer as defined in the Merck Inde~ th Edition.
The polysorbate ~0 component is water soluble and enables the hydrocarbon molecules that have been removed from the solid phase to move into a water-based or other charged solution. The molecules once freed from the surface that they have adhered to are kept in suspension or solution until removed from the region proximate to the producing folmation. Furthermore, the emulsifier selves as an antifoaming agent to aid 20 in the removal of the carrier and the entrained materials ~om the for~nation and well.
In use, the components of the concentrate begin to dissolve folmation plugs and increase flow from the production zone by a cooperative action which begins with the initial ~: ~
~,. "~ ~, -.. ..
.
.
2.t277~3 "
. . .
(~ ( penetration of the ~ylenes followed by softening and partial dissolution by the aliphatic .
solvent such as kerosene. In addition, the concentrate acts to soften scale causing it to break free from its substrate and be dispersed in the carrier fluid. The concentrate provides a residual coating on the well structure which selves to retard subsequent scale S buildup. By exposina the surfaces of the production-limiting material to the combined action of the detergent and surfactant, the hydlocarbon molecules move fiom the surface of the mass and they become suspended by the emulsifier in the carrier. ~e benefits of the novel combination of components in the concentrate in removing hydrocarbon solid reducing scale deposits and reducing surf<lce tension are apparent from the following results 10 of the injection of the present concentrate and carlier into limited prodllction wells.
E:~ample I
Gas Well - San Juan County, New Mexico Picture Cliff Folmation Prior Production Rate 317 MCF/day After Treatment 509 ~lCF/day ~0 :. --: '.' EYample II ;
Oil and Gas Well ~5 Sandoval County, New Mexico Dakota Folmation Prior Production Rate 51 MCF/day ! .
6.5 Bbl/day .
After Treatment 81 MCF/day 9.5 Bbl/day ''' ~ ~ :' -, ` 21277~3 ' E:cample III
Gas and Oil Well Rio AlTiba County, New MeYico S Mesa Verde Folmation - Prior Production Rate 3Z3 ~ICF/day ~.8 BbL/day : ` ' ' ' After Treatment ~38 MCF/day 6.1 Bbl/day 15. Example IV
Oil and Gas Well Rio Arriba County, New Me:cico Gallup Formation Prior Production Rate 32 l\~lCF/day 3.1 Bbl/day After Treatment ~S MCF/day 6.7 Bbl/day '~5 The concentrate used in the above-noted test had the following composition by weight: sorbitan monooleate and cocoamide DEA ~.6C/~, xylene 36.3C/t., kerosene 36.3~ and polysorbate ~0 at 13.~Yc.
The composition is prepared as a miYtule of the components which produces a c~ear 30 solution or a partially turbid solution based on the relative ranges of the ingredients. There is no known chemical reaction between the ingredients themselves so that the concentrate .is stable in the container. No special packaging techniques need be employed to contain the concentrate. Since the concentrate is separately contained, it is normally transported to the well site for addition to the carrier fluid. ~he preferred mrxture is about a fifty^five 35 to 1 ratio or 1 ~allon of concentrate to a barrel of carrier fluid.
17 ~ .
.. . , ~ : . . .
2~2~7743 (, Plior to the addition of the concentrate to the carrier fluid, determiDatiorl is made of the type of material plugging the well or production zone and the chemical composition of the produced oil and gas. This allows the selection of an appropriate oil-based or water-based carr;er fluid for the well treatment. For example, if the test show a predominance 5 of paraffins, waxes and oil sludges the selection of a heated oil carlier is indicated with additional emulsifier added. Should the tests sllow a high level of mixed scales and water based sludges then a heated water-based carrier with high levels of detergents and surfactants is indicated. As mentioned, the concentrate can be mixed in a standard compositional range for a particular prodllcing area w~th the additions and adjustments 10 made in the field if deemed necessaly.
The selected carrier is deliveled to the wellsite in a conventional "hot oil" truck which can provide a heated carrier fluid. The best results have been attained with a heated mixture of about 175 degrees F. The concentrate is added to the carrier in the "hot oil"
pumper truck. The tmck is then connected to the well and the mixture is forced down the 1~ well and into the surrounding region of the producing formation.
After the working mixture is pumped in, the well is shllt off and the mixture allowed to react with the materials in the collection system and the geological formation for up to .: ~
96 hours. Then, the well is allowed to flow back and the injected fluids ~re included in the production stream and normally passed to the subsequent processing facility. As shown by 20 the examples, the well is brought back into production at an enhanced rate. Normally, the process is repeated when production again drops to the operator's economic cut-off level.-However, should the well prove difficult to treat or the production rate be found to rapidly 2.~.27rl~ ~?
drop, the mrxture can be injected into the well at a low daily rate to reduce the rate at which production falls through buildup of plugving material.
While the above description has referred to a range of embodiments, it is to be noted that v~riations may be made therein without departing ~rom the scope of the .;
5 invention as claimed. - .
1~
Claims (15)
1. A concentrate to be added to carrier fluid, the combination of concentrate and carrier being injected into a well to increase the production of fluid hydrocarbons, said concentrate comprising:
a) xylene in the range of 20 to 60 percent by weight;
b) an aliphatic hydrocarbon solvent in the range of 20 to 60 percent by weight:
c) a nonionic emulsifier in the range of 10 to 30 percent by weight;
d) a nonionic surfactant in the range of 2 to 10 percent by weight; and e) an amide detergent in the range of 2 to 10 percent by weight.
a) xylene in the range of 20 to 60 percent by weight;
b) an aliphatic hydrocarbon solvent in the range of 20 to 60 percent by weight:
c) a nonionic emulsifier in the range of 10 to 30 percent by weight;
d) a nonionic surfactant in the range of 2 to 10 percent by weight; and e) an amide detergent in the range of 2 to 10 percent by weight.
2. The invention in accordance with Claim 1 further comprising water as a carrier fluid.
3. The invention in accordance with Claim 1 further comprising oil as a carrier fluid.
4. The invention in accordance with Claim 1 wherein the concentrate and carrier are heated to about 175 degrees F.
5. The invention in accordance with Claim 1 wherein said nonionic emulsifier is polysorbate 80.
6. The invention in accordance with Claim 5 wherein said nonionic surfactant is sorbitan monooleate.
7. The invention in accordance with Claim 5 wherein said amide deterdent is cocoamide diethylamine.
8. A concentrate to be added to carrier fluid, the combination of concentrate and carrier being injected into a well to increase the production of fluid hydrocarbons, said concentrate comprising:
a) an aromatic solvent containing at least one isomer of xylene, said solvent being present in the mixture in the range of 20 to 60 percent by weight;
b) an aliphatic hydrocarbon solvent in the range of 20 to 60 percent by weight;
c) a polysorbate emulsifier in the range of 10 to 30 percent by weight:
d) sorbitan monooleate in the range of 2 to 10 percent by weight: and e) a cocoamide detergent in the range of 2 to 10 percent by weight.
a) an aromatic solvent containing at least one isomer of xylene, said solvent being present in the mixture in the range of 20 to 60 percent by weight;
b) an aliphatic hydrocarbon solvent in the range of 20 to 60 percent by weight;
c) a polysorbate emulsifier in the range of 10 to 30 percent by weight:
d) sorbitan monooleate in the range of 2 to 10 percent by weight: and e) a cocoamide detergent in the range of 2 to 10 percent by weight.
9. The invention in accordance with Claim 8 wherein said aliphatic hydrocarbon is kerosene.
10. The invention in accordance with Claim 9 further comprising water as a carrier fluid.
11. The invention in accordance with Claim 9 further comprising oil as a carrier fluid.
12. A method of stimulating production of hydrocarbons from a well by the injection of a mixture of carrier and concentrate which comprises the steps of:
a) select from a hydrocarbon carrier or a water carrier in accordance with a determination of the type of material interfering with production from the well:
b) add to the selected carrier a concentrate comprising:
i. an aromatic solvent containing at least one isomer of xylene in the range of 20 to 60 percent by weight;
ii. an aliphatic hydrocarbon solvent in the range of 20 to 60 percent by weight;
iii. polysorbate 80 emulsifier in the range of 2 to 10 percent by weight;
iv. sorbitan monooleate in the range of 2 to 10 percent by weight; and v. cocoamide diethylamine detergent in the range of 2 to 10 percent by weight.
c) inject the mixture of carrier and concentrate into the well: and d) recover the mixture from the well.
a) select from a hydrocarbon carrier or a water carrier in accordance with a determination of the type of material interfering with production from the well:
b) add to the selected carrier a concentrate comprising:
i. an aromatic solvent containing at least one isomer of xylene in the range of 20 to 60 percent by weight;
ii. an aliphatic hydrocarbon solvent in the range of 20 to 60 percent by weight;
iii. polysorbate 80 emulsifier in the range of 2 to 10 percent by weight;
iv. sorbitan monooleate in the range of 2 to 10 percent by weight; and v. cocoamide diethylamine detergent in the range of 2 to 10 percent by weight.
c) inject the mixture of carrier and concentrate into the well: and d) recover the mixture from the well.
13. The invention in accordance with Claim 12 further comprising the steps continually injecting the mixture of carrier and concentrate into the well concurrently with the production of hydrocarbons from the well.
14. The invention in accordance with Claim 12 wherein said concentrate is added to the carrier at a rate of about 1:55 by volume.
15. The invention in accordance with Claim 14 further comprising the step of preheating the mixture to a temperature of about 175 degrees F prior to injection of the mixture into the well.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9515693A | 1993-07-20 | 1993-07-20 | |
| US095,156 | 1993-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2127743A1 true CA2127743A1 (en) | 1995-01-21 |
Family
ID=22250205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002127743A Abandoned CA2127743A1 (en) | 1993-07-20 | 1994-07-11 | Method and composition for enhancing hydrocarbon production from wells |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5670460A (en) |
| CA (1) | CA2127743A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19708499A1 (en) * | 1997-03-03 | 1998-09-10 | Henkel Kgaa | Process for removing solid asphalt residues from oil production |
| EP1212385B1 (en) * | 1999-09-07 | 2015-12-30 | Akzo Nobel Surface Chemistry Aktiebolag | Quaternary ammonium salts as thickening agents for aqueous systems |
| US7358215B1 (en) | 1999-09-07 | 2008-04-15 | Akzo Nobel Surface Chemistry Llc | Quaternary ammonium salts as thickening agents for aqueous systems |
| GB2371823B (en) | 1999-09-24 | 2004-09-01 | Akzo Nobel Nv | A method of improving the permeability of an underground petroleum-containing formation |
| US8273693B2 (en) | 2001-12-12 | 2012-09-25 | Clearwater International Llc | Polymeric gel system and methods for making and using same in hydrocarbon recovery |
| US20070125542A1 (en) * | 2005-12-07 | 2007-06-07 | Akzo Nobel N.V. | High temperature gellant in low and high density brines |
| US8065905B2 (en) | 2007-06-22 | 2011-11-29 | Clearwater International, Llc | Composition and method for pipeline conditioning and freezing point suppression |
| US8099997B2 (en) | 2007-06-22 | 2012-01-24 | Weatherford/Lamb, Inc. | Potassium formate gel designed for the prevention of water ingress and dewatering of pipelines or flowlines |
| US20100108570A1 (en) * | 2008-11-06 | 2010-05-06 | Nath Cody W | Method for improving liquid yield in a delayed coking process |
| US8480812B2 (en) * | 2009-06-04 | 2013-07-09 | Refined Technologies, Inc. | Process for removing hydrocarbons and noxious gasses from reactors and media-packed equipment |
| US20100311620A1 (en) * | 2009-06-05 | 2010-12-09 | Clearwater International, Llc | Winterizing agents for oil base polymer slurries and method for making and using same |
| US20110056694A1 (en) * | 2009-09-10 | 2011-03-10 | Refined Technologies, Inc. | Methods For Removing Paraffinic Hydrocarbon Or Bitumen In Oil Producing Or Disposal Wells |
| CA2789917C (en) * | 2011-09-16 | 2015-10-20 | Sabatino Nacson | Method of oil extraction |
| US9127542B2 (en) * | 2014-01-28 | 2015-09-08 | Lawrence O. Price | Subterranean well treatment process |
| CN107236530B (en) * | 2017-07-10 | 2019-01-04 | 山东大学 | A kind of water-base viscosity-reducing agent of emulsified superthick oil and preparation method thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2753939A (en) * | 1954-03-15 | 1956-07-10 | Union Oil Co | Removal of waxy sludges from pipelines and oil wells |
| US2817635A (en) * | 1954-07-27 | 1957-12-24 | Texas Co | Prevention of paraffin deposition and plugging |
| US3241614A (en) * | 1963-07-08 | 1966-03-22 | Socony Mobil Oil Co Inc | Cleaning of wellbores |
| US3402770A (en) * | 1965-06-02 | 1968-09-24 | Mobil Oil Corp | Multiple-purpose solvent and method for treating subterranean formations |
| US3437146A (en) * | 1968-01-11 | 1969-04-08 | Midwest Chem & Processing Co I | Method of removing paraffin from a well with heated solvent |
| US3718586A (en) * | 1971-12-02 | 1973-02-27 | W Rollo | Solvent for cleaning well bores,flowlines,etc. |
| US4436638A (en) * | 1981-04-15 | 1984-03-13 | Exxon Research & Engineering Co. | Additive composition for release of stuck drill pipe |
| US4614236A (en) * | 1984-05-29 | 1986-09-30 | Union Oil Company Of California | Self-breaking foamed oil-in-water emulsion for stimulation of wells blocked by paraffinic deposits |
| US4614235A (en) * | 1985-04-15 | 1986-09-30 | Exxon Chemical Patents Inc. | Use of mono and polyalkylene glycol ethers as agents for the release of differentially stuck drill pipe |
| US4925497A (en) * | 1987-10-13 | 1990-05-15 | Petrolite Corporation | Solvent for paraffin removal from oilfield equipment |
-
1994
- 1994-07-11 CA CA002127743A patent/CA2127743A1/en not_active Abandoned
-
1996
- 1996-01-16 US US08/587,040 patent/US5670460A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5670460A (en) | 1997-09-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2127743A1 (en) | Method and composition for enhancing hydrocarbon production from wells | |
| CA2183339C (en) | Application of n,n-dialkylamides to control the formation of emulsions or sludge during drilling or workover of producing oil wells | |
| US20140128296A1 (en) | Tunable polymeric surfactants for mobilizing oil into water | |
| US20170198194A1 (en) | Asphaltene inhibitors for squeeze applications | |
| US6112814A (en) | Method for cleaning wellbore surfaces using coiled tubing with a surfactant composition | |
| US3724553A (en) | Paraffin well treatment method | |
| US3794523A (en) | Scale removal | |
| US5358052A (en) | Conditioning of formation for sandstone acidizing | |
| US20100130384A1 (en) | Compositions and Methods for Removal of Asphaltenes from a Portion of a Wellbore or Subterranean Formation | |
| EA023408B1 (en) | Asphaltene removal composition and methods | |
| US4414035A (en) | Method for the removal of asphaltenic deposits | |
| CA2091541C (en) | Anionic compositions for sludge prevention and control during acid stimulation of hydrocarbon wells | |
| US20060281636A1 (en) | Single fluid acidizing treatment | |
| US20100022417A1 (en) | Composition and Method for the Removal or Control of Paraffin Wax and/or Asphaltine Deposits | |
| CA2530584C (en) | Composition and method for diversion agents for acid stimulation of subterranean formations | |
| CA2132041A1 (en) | Process for removing and preventing near-wellbore damage due to asphaltene precipitation | |
| O'Neil et al. | Prevention of acid-induced asphaltene precipitation: a comparison of anionic vs. cationic surfactants | |
| US9862873B2 (en) | System for removing organic deposits | |
| Samuelson | Alternatives to aromatics for solvency of organic deposits | |
| US7115547B2 (en) | Additive for enhanced treatment of oil well contaminants | |
| CA2090306E (en) | Oil and gas well operation fluid used for the solvation of waxes and asphaltenes, and method of use thereof | |
| US20220340806A1 (en) | Silica substrates for slow release asphaltene control chemical squeeze treatments | |
| Rosanel | Novel Multi-Functional Chemistry to Maximize Performance in Paraffin Coated Acid Soluble Scale Cleanups | |
| SU1002541A1 (en) | Method of treating hole bottom zone of oil-bearing formation | |
| GB2167468A (en) | A non-emulsifying agent and its use for the increased recovery of oil from the stimulation of an oil reservoir |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |