CN104293330A - High-temperature low-permeability oil reservoir CO2 gas-flooding channel-blocking agent - Google Patents

High-temperature low-permeability oil reservoir CO2 gas-flooding channel-blocking agent Download PDF

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Publication number
CN104293330A
CN104293330A CN201310297000.8A CN201310297000A CN104293330A CN 104293330 A CN104293330 A CN 104293330A CN 201310297000 A CN201310297000 A CN 201310297000A CN 104293330 A CN104293330 A CN 104293330A
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agent
temperature low
high temperature
low permeability
acrylamide
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CN201310297000.8A
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CN104293330B (en
Inventor
罗跃
李凡
丁康乐
汪庐山
刘巍
罗宵
肖清燕
安科
王鼎
李博阳
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Yangtze University
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Yangtze University
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    • 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
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
    • 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
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
    • 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
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
    • C09K8/493—Additives for reducing or preventing gas migration
    • 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
    • C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas

Abstract

The invention relates to a high-temperature low-permeability oil reservoir CO2 gas-flooding channel-blocking agent, and relates to the technical field of oil drilling engineering chemical agent application. The channel-blocking agent is characterized in that the agent is composed of, by weight, 4.5-7.5% of acrylamide, 0.2-0.5% of a modifier, 0.05-0.1% of an emulsifier, 0.02-0.05% of an initiator, 0.3-1% of N,N-methylene-bis-acrylamide, 0.1-0.5% of formaldehyde, 0.5-4.5% of a retarder, and balance of water. The channel-blocking agent provided by the invention has low viscosity under normal temperature before gelling, and can be easily pumped into stratum. When the channel-blocking agent is gelled, the agent has high strength. The channel-blocking agent has the characteristics of acid resistance, high-temperature resistance, erosion resistance, stable performance, controllable gelling time, and high blocking rate.

Description

A kind of high temperature LOW PERMEABILITY RESERVOIR CO 2gas drive envelope alters agent
Technical field:
The present invention relates to a kind of high temperature LOW PERMEABILITY RESERVOIR CO 2gas drive envelope alters agent, belongs to petroleum drilling engineering chemical agent applied technical field.
Background technology:
The most oil reservoir of China is based on nonmarine deposit, the rhythm is complicated, main force oil field is in High water cut or ultra-high water-containing productive life at present, reservoir heterogeneity aggravates, macropore phenomenon is serious, remaining oil distribution scatteredization, conventional water drive, chemical flooding and Microbial Enhanced Oil Recovery can not meet the Production requirement of maturing field, and increasing substantially oil recovery factor becomes a very important task.Statistical information shows, improve at maturing field in the utilisation technology of recovery ratio, gas-injection oil-production is worldwide occupied an leading position.In recent years, gas injection is driven the situation that increases year by year and significant effect and is become the EOR technology had a high potential in world today's oil production.
The oil reservoir of China belongs to nonmarine deposit mostly, serious heterogeneity, at CO 2in the process of the gas displacement of reservoir oil, by the impact of the factors such as the slippage effect of gas, viscous fingering and Reservoir Heterogeneity, be easy to has channeling occurs and has channeling situation differs greatly, generally there is macropore channelling, most permeable zone such as to be advanced by leaps and bounds at the problem.Inject CO 2early breakthrough was not involved causing most of reservoir of oil reservoir, made oil reservoir injection CO 2exploitation is difficult to the development effectiveness reaching expection.Therefore at CO 2before gas drive work, shutoff most permeable zone effectively, to preventing at CO 2occur most important along the has channeling of high permeability zone during gas drive.
For high temperature LOW PERMEABILITY RESERVOIR CO 2problems existing in gas drive process, develops the temperature resistance of excellent property, agent is altered by anti-salt, easily injection envelope, is improve to improve CO 2flooding Efficiency in the urgent need to.
Summary of the invention:
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of high temperature LOW PERMEABILITY RESERVOIR CO 2gas drive envelope alters agent, and the viscosity under the non-Gelation Conditions of normal temperature is low, easily pumps into stratum, and after waiting the glue that congeals into, intensity is high, and have antiacid, high temperature resistance, antiscour, stable performance, gelation time is controlled, the feature that sealing ratiod is high.
The present invention realizes above-mentioned purpose by following technical solution.
A kind of high temperature LOW PERMEABILITY RESERVOIR CO provided by the present invention 2gas drive envelope alters agent, and it consists of: acrylamide, properties-correcting agent, emulsifying agent, initiator, N,N methylene bis acrylamide, formaldehyde, retarder and water;
Wherein the weight percent of each component is:
Acrylamide: 4.5 ~ 7.5%;
Properties-correcting agent: 0.2 ~ 0.5%;
Emulsifying agent: 0.05 ~ 0.1%;
Initiator: 0.02 ~ 0.05%;
N,N methylene bis acrylamide: 0.3 ~ 1%;
Formaldehyde: 0.1 ~ 0.5%;
Retarder: 0.5 ~ 4.5%;
Water: surplus;
Described properties-correcting agent is: the one in solution property, acrylyl oxy-ethyl-trimethyl salmiac, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, dimethyl diallyl ammonium chloride;
Described emulsifying agent is: the one in sodium lauryl sulphate salt, calcium salt of dodecylbenzene sulfonate, OP-10, OP-15, T-60, T-80, S-80, S-85;
Described initiator is: the one in Potassium Persulphate, benzoyl peroxide, di-t-butyl peroxide, dilauroyl peroxide, Diisopropyl azodicarboxylate, the peroxidation trimethylacetic acid tert-butyl ester, isopropyl benzene hydroperoxide;
Described retarder is: the one in Resorcinol, para benzoquinone, phenothiazine, p-ten.-butylcatechol, methylene blue, cuprous chloride, iron trichloride;
Described water is simulated formation water, and its salinity is: 57728.92mg.L -1.
A kind of high temperature LOW PERMEABILITY RESERVOIR CO provided by the present invention 2the preparation method that gas drive envelope alters agent is:
Join in the beaker of 250mL by acrylamide, properties-correcting agent, emulsifying agent, initiator, N,N methylene bis acrylamide, formaldehyde, retarder in proportion, then adding salinity is 57728.92mg.L -1simulated formation water, constant volume, to 100mL, stirs, and obtains envelope of the present invention and alters agent solution.
The present invention has following beneficial effect compared with prior art:
1, to alter the viscosity of agent under the non-Gelation Conditions of normal temperature lower for envelope of the present invention, and easily pump into stratum, injection pressure is very low, is specially adapted to the shutoff of LOW PERMEABILITY RESERVOIR.
2, to alter agent gelation time controlled for envelope of the present invention, and the gelation time 126 DEG C time can control at 2-30 hour, and after complete plastic, intensity is high, and viscosity is 10 6more than mPa.s.
3, envelope of the present invention alters that agent is antiacid, high temperature resistance, and the gel after plastic, under pH=3,126 DEG C of conditions, places 3 months viscosity stablization.
4, envelope of the present invention alters agent energy antiscour, and the sealing ratiod after waterflood flush 40PV is still greater than 90%.
Accompanying drawing illustrates:
Fig. 1 is the graph of relation that envelope alters agent injection rate and sealing ratiod.
Fig. 2 is the graph of relation of water drive fill out sand tube shutoff logistics organizations.
Fig. 3 is CO 2drive the graph of relation of fill out sand tube shutoff logistics organizations.
Embodiment:
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1:
By 4.5g acrylamide, 0.2g properties-correcting agent, 0.03g initiator, 0.05g emulsifying agent, 0.5gN, N-methylene-bisacrylamide, 0.25g formaldehyde, 0.5g retarder join in 250mL beaker, and then add simulated formation water, constant volume is to 100mL, stir, obtain L-1 envelope and alter agent solution.
This envelope altered under agent solution is placed on the condition of 126 DEG C, sealing is placed time and to be congealed into glue; Gelation time is about 10h, becomes gumminess to be 241 × 10 4mPa.s.
Embodiment 2:
By 4.5g acrylamide, 0.3g properties-correcting agent, 0.04g initiator, 0.05g emulsifying agent, 0.5g N, N-methylene-bisacrylamide, 0.25g formaldehyde, 1g retarder join in 250mL beaker, and then add simulated formation water, constant volume is to 100mL, stir, obtain L-2 envelope and alter agent solution.
This envelope altered under agent solution is placed on the condition of 126 DEG C, sealing is placed time and to be congealed into glue; Gelation time is about 11.5h, becomes gumminess to be 150 × 10 4mPa.s.
Embodiment 3:
By 5g acrylamide, 0.4g properties-correcting agent, 0.05g initiator, 0.1g emulsifying agent, 0.5g N, N-methylene-bisacrylamide, 0.25g formaldehyde, 5g retarder join in 250mL beaker, and then add simulated formation water, constant volume is to 100mL, stir, obtain L-3 envelope and alter agent solution.
This envelope altered under agent solution is placed on the condition of 126 DEG C, sealing is placed time and to be congealed into glue; Gelation time is about 18h, becomes gumminess to be 128 × 10 4mPa.s.
Embodiment 4:
Rock core erosion resistibility measures:
L-1 envelope in embodiment 1 is altered agent solution to be injected in natural core, under the condition of 126 DEG C, waits solidifying 48h plastic, then continues water drive, measure the sealing ratiod of rock core.Result is as shown in table 1, table 2.
Table 1 rock core basic parameter
Result shows: the flushing resistance that this envelope alters agent gel is good.Reservoir core plugging rate slowly declines with the increase of volume of water input, and when the sealing ratiod after waterflood flush 40PV is still greater than 90%, sealing characteristics is good.
Embodiment 5:
The relation of injection rate and sealing ratiod measures:
In order to select the injection rate of economical rationality, devising 8 kinds of different injection rates, the L-1 envelope in embodiment 1 being altered agent solution and is injected into after in fill out sand tube, under the condition of 126 DEG C, place 48h and wait the glue that congeals into, then carry out water drive, measure the sealing ratiod of fill out sand tube.Result shows, along with envelope alters the increase of agent solution injection rate, fill out sand tube sealing ratiod improves constantly, and when injection rate reaches 0.6PV, sealing ratiod can reach more than 90%, and as can be seen here, it is relatively good that this envelope alters the sealing characteristics of agent to rock core.Experimental result as shown in Figure 1.
Embodiment 6:
Water drive fill out sand tube shutoff logistics organizations:
After L-1 envelope in embodiment 1 is altered agent solution injection fill out sand tube, the gelling temperature of fill out sand tube is set as 126 DEG C, 48h, after treating plastic, measures its plugging effect.When envelope alters agent solution in fill out sand tube after plastic, follow-up water-flooding pressure, compared with the water-flooding pressure before shutoff, significantly increases.Test known thus, this envelope alters agent system can play good plugging action.Experimental result as shown in Figure 2.
Embodiment 7:
CO 2drive fill out sand tube shutoff logistics organizations:
After L-1 envelope in embodiment 1 is altered agent solution injection fill out sand tube, the gelling temperature of fill out sand tube is set as 126 DEG C, 48h, after treating plastic, measures its plugging effect.Water In The Experiment drives and injects envelope to alter the pressure of agent solution all very low, approximately only has about 0.08MPa, illustrates that to seal the injection of altering agent solution good.CO is used again after shutoff 2displacement, recording its breakthrough pressure is 2.2MPa, illustrates that this envelope alters agent gel to CO 2there is extraordinary plugging action.Experimental result as shown in Figure 3.

Claims (6)

1. a high temperature LOW PERMEABILITY RESERVOIR CO 2gas drive envelope alters agent, it is characterized in that it consists of: acrylamide, properties-correcting agent, emulsifying agent, initiator, N,N methylene bis acrylamide, formaldehyde, retarder and water; Wherein the weight percent of each component is:
Acrylamide: 4.5 ~ 7.5%;
Properties-correcting agent: 0.2 ~ 0.5%;
Emulsifying agent: 0.05 ~ 0.1%;
Initiator: 0.02 ~ 0.05%;
N,N methylene bis acrylamide: 0.3 ~ 1%;
Formaldehyde: 0.1 ~ 0.5%;
Retarder: 0.5 ~ 4.5%;
Water: surplus.
2. a kind of high temperature LOW PERMEABILITY RESERVOIR CO according to claim 1 2gas drive envelope alters agent, it is characterized in that described properties-correcting agent is: the one in solution property, acrylyl oxy-ethyl-trimethyl salmiac, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, dimethyl diallyl ammonium chloride.
3. a kind of high temperature LOW PERMEABILITY RESERVOIR CO according to claim 1 2gas drive envelope alters agent, it is characterized in that described emulsifying agent is: the one in sodium lauryl sulphate salt, calcium salt of dodecylbenzene sulfonate, OP-10, OP-15, T-60, T-80, S-80, S-85.
4. a kind of high temperature LOW PERMEABILITY RESERVOIR CO according to claim 1 2gas drive envelope alters agent, it is characterized in that described initiator is: the one in Potassium Persulphate, benzoyl peroxide, di-t-butyl peroxide, dilauroyl peroxide, Diisopropyl azodicarboxylate, the peroxidation trimethylacetic acid tert-butyl ester, isopropyl benzene hydroperoxide.
5. a kind of high temperature LOW PERMEABILITY RESERVOIR CO according to claim 1 2gas drive envelope alters agent, it is characterized in that described retarder is: the one in Resorcinol, para benzoquinone, phenothiazine, p-ten.-butylcatechol, methylene blue, cuprous chloride, iron trichloride.
6. a kind of high temperature LOW PERMEABILITY RESERVOIR CO according to claim 1 2gas drive envelope alters agent, and it is characterized in that described water is simulated formation water, its salinity is: 57728.92mg.L -1.
CN201310297000.8A 2013-07-16 2013-07-16 A kind of high temperature LOW PERMEABILITY RESERVOIR CO2Gas drive envelope alters agent Active CN104293330B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN107882531A (en) * 2017-12-01 2018-04-06 中国石油天然气股份有限公司 Method is altered in the selectively control water seal of watered out reservoirs fireflood producing well

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Publication number Priority date Publication date Assignee Title
CN107882531A (en) * 2017-12-01 2018-04-06 中国石油天然气股份有限公司 Method is altered in the selectively control water seal of watered out reservoirs fireflood producing well

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