CN103912246A - Combined geothermal well with perforation structure - Google Patents
Combined geothermal well with perforation structure Download PDFInfo
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- CN103912246A CN103912246A CN201210593247.XA CN201210593247A CN103912246A CN 103912246 A CN103912246 A CN 103912246A CN 201210593247 A CN201210593247 A CN 201210593247A CN 103912246 A CN103912246 A CN 103912246A
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- cement
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- sleeve pipe
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Abstract
The invention provides a combined geothermal well with a perforation structure. The combined geothermal well comprises a first casing, a second casing and a third casing which are nested with one another, wherein the first casing, the second casing and the third casing are orderly arranged from the outside to inside and from the top to bottom; the first casing is composed of a surface casing and a first cement tube outside the surface casing; the second casing is composed of an intermediate casing at the inner layer, a first cement casing at the outer layer and a second cement tube at the outer layer; the first cement casing is arranged on the second cement tube in a sleeving manner; the third casing is composed of an oil casing and a third cement tube sleeving outside the oil casing; the third casing is provided with a perforation and a well bottom which is sealed by a cement plug; the cement plug is of a multi-layer structure; the aperture of the perforation is 5-31mm, the hole density is 6-24 holes/m, the phase is 45 degrees, 60 degrees, 90 degrees, 120 degrees or 135 degrees and the penetration depth of the perforation is 146-813m. The combined geothermal well has the advantages that sand production after perforating is reduced, water yield is increased and geothermal exploration development effect is also improved.
Description
Technical field
The invention belongs to the exploitation field of geothermal energy resources, especially relate to a kind of combined type perforation hot well being structurally transformed into by oil disused well.
Background technology
Perforation completion is the at present domestic and international most popular a kind of completion method of oil well.In recent years, some oil fields are applied to discarded oil well by perforating technology and transform as on geothermal well, but because geothermal reservoir is different from petroleum reservoir, as granular size, degree of sorting, reservoir compactness all has larger difference, and other well drilling technology of different well and mining type and yield also have very big difference, therefore, indiscriminately imitating oil well gun perforation process is applied in geothermal well, can cause geothermal well water yield to reduce, continued sand production, brings unnecessary trouble to exploitation and utilization of geotherm resources.Therefore after how reducing perforation, shake out, increase water yield, improved geothermal prospecting development effectiveness, become the present stage technical issues that need to address.
Summary of the invention
For the deficiencies in the prior art, the problem to be solved in the present invention is to provide a kind of combined type perforation hot well structurally, consider aperture, Kong Mi, phase place and the penetration depth of perforation, after reducing perforation, shake out and increase water yield, improve geothermal prospecting development effectiveness.
Technical scheme of the present invention is:
A kind of combined type perforation hot well structurally, comprise the first mutually nested sleeve pipe, the second sleeve pipe and the 3rd sleeve pipe, and described the first sleeve pipe, described the second sleeve pipe and described the 3rd sleeve pipe ecto-entad, set gradually from top to bottom, described the first sleeve pipe forms by showing cover and be located at the first outside pipe of cement of described table cover, described the second sleeve pipe is made up of the skill cover of internal layer and outer field the first cement sheath and outer field the second pipe of cement, described the first cement sheath is located at the top of described the second pipe of cement, described the 3rd sleeve pipe is made up of oil jacket and the 3rd pipe of cement that is sheathed on described oil jacket outside, described the 3rd sleeve pipe is provided with perforation and is sealed the shaft bottom forming by cement plug, described cement plug is multilayer setting, the aperture of described perforation is 5-31mm, Kong Miwei 6-24 hole/m, phase place is 45 °, 60 °, 90 °, 120 ° or 135 °, perforation penetration is 146～813mm.
Described perforation diameter is 31mm, Kong Miwei 13 holes/m, and phase place is 90 °, perforation penetration is 152mm.
Described the first cement sheath and described the second cement sheath are to backfilling cement position after oil well transformation cutting.
Advantage and good effect that the present invention has are:
Major parameter (Kong Mi, aperture, phase place, the penetrate dark) combination that the present invention is directed to perforation is set out, and shakes out after reducing perforation, increases water yield, has improved geothermal prospecting development effectiveness.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Fig. 2 is perforation penetration and relationship between productivity figure
1, the first sleeve pipe 2, the second sleeve pipe 3, the 3rd sleeve pipe
4, table cover 5, skill cover 6, oil jacket
7, the first pipe of cement 8, cement plug 9, perforation
10, the first cement sheath 11, the second cement sheath 12, the second pipe of cement
13, the 3rd pipe of cement
The specific embodiment
As shown in Figure 1: the invention provides a kind of combined type perforation hot well structurally, comprise the first mutually nested sleeve pipe 1, the second sleeve pipe 2 and the 3rd sleeve pipe 3, and described the first sleeve pipe 1, described the second sleeve pipe 2 and described the 3rd sleeve pipe 3 ecto-entads, set gradually from top to bottom, described the first sleeve pipe 1 is by table cover 4 and be located at the first pipe of cement 7 that described table overlaps 4 outsides and form, described the second sleeve pipe 2 is made up of the skill cover 5 of internal layer and outer field the first cement sheath 10 and outer field the second pipe of cement 11, described the first cement sheath 10 is located at the top of described the second pipe of cement 12, described the 3rd sleeve pipe 3 is made up of oil jacket 6 and the 3rd pipe of cement 13 that is sheathed on described oil jacket 6 outsides, described the 3rd sleeve pipe 3 is provided with perforation 9 and is sealed the shaft bottom forming by cement plug 8, described cement plug 8 is multilayer setting, the aperture of described perforation 9 is 5-31mm, Kong Miwei 6-24 hole/m, phase place is 45 °, 60 °, 90 °, 120 ° or 135 °, perforation 9 penetration depths are 146～813mm.
Described perforation 9 apertures are 31mm, Kong Miwei 13 holes/m, and phase place is 90 °, perforation 9 penetration depths are 152mm.
Described the first cement sheath 10 and described the second cement sheath 11 are to backfilling cement position after oil well transformation cutting.
The performance of the parameter such as the aperture on perforation, Kong Mi, phase place and penetration depth on geothermal well and the impact of production capacity is below introduced:
1, aperture
Perforation diameter is conventionally at 5～31mm, and the selection in aperture and well-completing process have important relation.Sand control completion requires aperture large, and the capacity of gravel pack is large, and the flow area in duct is large, and mobile resistance and the speed of minimizing GEOTHERMAL WATER, is conducive to improve water yield and minimizing is shaked out.In the situation that other conditions are identical, to conventional completion and volume increase completion, perforation diameter is larger, and the production capacity of production is larger.Except structure types and institute's explosive payload of perforating bullet determine to affect aperture, the factor that affects perforation bore is the gap between perforating gun and sleeve pipe, in the time that perforation is ignited in the center of perforating gun in sleeve pipe, and the aperture maximum of perforation; And in the time that perforating gun is ignited perforation near sleeve pipe position on one side, aperture minimum; In the time that perforation is ignited in the position of perforating gun in cover tube hub and between keeping to the side, aperture falls between.Therefore, perforating gun is best in wellbore centre position perforating effect.
2, Kong Mi and phase place
Kong Mi and phase place are that productivity of well completion increases along with the increase of Kong Mi and reducing of phase place on the impact of productivity of well completion.When shot density is that 13 holes/m (4 holes/ft), phase place are 90 ° and perforation penetration while reaching 152mm, under the ideal conditions polluting without drilling fluid contamination and perforation, productivity of well completion can reach the effect of barefoot completion.
In completion practice, the completion quality of different Perforation Densities and phase combination, effect have different.The close sand controlling result in He Gao hole, large aperture is better; High Kong Mi and deep penetration meet conventional completion requirement; Effect of increasing production is good for high Kong Mi and low phase place completion technology.As can be seen here, Gao Kongmi is the essential condition that various completion methods all require.In permeability anisotropy and the oil-gas Layer that contains intercalated shale, the increase of Kong Mi is very favourable to the raising of production capacity, and its impact even exceedes perforation and wears deeply.
The selection of perforation phase place not only has impact to process method for well completion and production capacity, and the intensity after well-case perforating is also had to impact.When perforation phase place is 135 ° or 45 °, casing strength remains in higher ratio range, reaches the more than 80% of former casing strength, and this Production Life to geothermal well has material impact.
Select suitable phase angle can improve the production capacity of perforation completion, at homogeneous formation, 90 ° of phase angle the bests, at inhomogeneous formation, 120 ° of phase place the bests, in 60 ° of phase place the bests of loose sand, 60 ° of phase places are also the optimum phases that maintains casing strength simultaneously.
3, perforation penetration
Perforation penetration is the length of perforation tunnel, and penetration depth is generally in the scope of 146～813mm.Different process method for well completion are different to the requirement of perforation penetration with formation physical property.The stratum of conventional completion and severe contamination requires deep penetration, high permeability formation, fractured reservoir and the large stratum of drilling fluid contamination degree, also require deep penetrating perforating, makes to set up unimpeded flow channel between pit shaft and high permeability formation, fractured reservoir, reduce resistance, improve production capacity.
In a word, the requirement of Different Strata physical property type aperture, Kong Mi, phase place and hole depth to perforation with well-completing process mode is different.According to actual formation physical property and well-completing process requirement, optimize the parameter combinations such as rational aperture, Kong Mi, phase place and hole depth.As shown in table 1, the sand control completion of unstressed sand, first the selection of perforating parameter generally considers aperture, is secondly Kong Mi, moreover is phase place, is finally hole depth.
The selection of table 1 well-completing process mode to perforating parameter
1.
1. the significance level of 1,2,3,4 expression parameters in table, numeral is more little more important.
2. Kong Mi, phase place are all same value, represent both of equal importance.
Various physical property types of formations in well-completing process to the combining structure of perforating parameter select can reference table 2 order.
The selection of table 2 stratigraphic type to perforating parameter
The significance level of 1,2,3,4 expression parameters in table, numeral is more little more important.
Since 2006, my company is successively by T38, T38-1, T38-2, T20, the discarded oil well such as T20-2 has been transformed successfully Guantao group and Dongying Formation geothermal well, all perforation Cheng Jing according to the method described above, geothermal well outflow water temperature 68-85 degree, water yield 58-108 cubic meter/hour, geothermal well is for geothermal heating system and supply domestic hot-water, and area of heat-supply service is up to more than 20 ten thousand square meters, obtain remarkable economy, environment and social effect.
Above one embodiment of the present of invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variation and improvement etc. of doing according to the present patent application scope, within all should still belonging to patent covering scope of the present invention.
Claims (3)
1. combined type perforation hot well structurally, comprise the first mutually nested sleeve pipe, the second sleeve pipe and the 3rd sleeve pipe, and described the first sleeve pipe, described the second sleeve pipe and described the 3rd sleeve pipe ecto-entad, set gradually from top to bottom, described the first sleeve pipe forms by showing cover and be located at the first outside pipe of cement of described table cover, described the second sleeve pipe is made up of the skill cover of internal layer and outer field the first cement sheath and outer field the second pipe of cement, described the first cement sheath is located at the top of described the second pipe of cement, described the 3rd sleeve pipe is made up of oil jacket and the 3rd pipe of cement that is sheathed on described oil jacket outside, it is characterized in that: described the 3rd sleeve pipe is provided with perforation and is sealed the shaft bottom forming by cement plug, described cement plug is multilayer setting, the aperture of described perforation is 5-31mm, Kong Miwei 6-24 hole/m, phase place is 45 °, 60 °, 90 °, 120 ° or 135 °, perforation penetration is 146～813mm.
2. combined type perforation according to claim 1 hot well structurally, is characterized in that: described perforation diameter is 31mm, Kong Miwei 13 holes/m, and phase place is 90 °, perforation penetration is 152mm.
3. combined type perforation according to claim 1 hot well structurally, is characterized in that: described the first cement sheath and described the second cement sheath are for transforming the rear backfilling cement of cutting position to oil well.
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| CN201210593247.XA CN103912246A (en) | 2012-12-29 | 2012-12-29 | Combined geothermal well with perforation structure |
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| CN201210593247.XA CN103912246A (en) | 2012-12-29 | 2012-12-29 | Combined geothermal well with perforation structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653148A (en) * | 2014-12-30 | 2015-05-27 | 王作韬 | Well group reforming comprehensive utilization method for waste oil wells |
| CN105804654A (en) * | 2016-03-16 | 2016-07-27 | 中石化绿源地热能开发有限公司 | Novel well bore structure and well completion method for geothermal well |
| CN107313747A (en) * | 2017-08-17 | 2017-11-03 | 李建峰 | One kind only takes hot ground hot hole pore-fixing device and the method for not fetching water |
| CN109723401A (en) * | 2017-10-27 | 2019-05-07 | 中国石油化工集团公司 | The method that oilfield waste well is transformed into geothermal well |
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| CN1215790A (en) * | 1998-11-25 | 1999-05-05 | 王素英 | Matching technique for changing production well into geothermal exploitation well |
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| CN101832673A (en) * | 2010-01-27 | 2010-09-15 | 龚智勇 | Method and device for conducting and recycling subterranean heat with production casings |
| US20110036571A1 (en) * | 2007-07-03 | 2011-02-17 | Ivan Vitalievich | Perforation strategy for heterogeneous proppant placement in hydraulic fracturing |
| CN202117575U (en) * | 2011-07-07 | 2012-01-18 | 天津滨海世纪能源科技发展有限公司 | Geothermal well formed by reforming petroleum abandoned well |
| CN203022712U (en) * | 2012-12-29 | 2013-06-26 | 天津滨海世纪能源科技发展有限公司 | Combined geothermal well with perforation structure |
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2012
- 2012-12-29 CN CN201210593247.XA patent/CN103912246A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1215790A (en) * | 1998-11-25 | 1999-05-05 | 王素英 | Matching technique for changing production well into geothermal exploitation well |
| US20110036571A1 (en) * | 2007-07-03 | 2011-02-17 | Ivan Vitalievich | Perforation strategy for heterogeneous proppant placement in hydraulic fracturing |
| CN101187961A (en) * | 2007-11-20 | 2008-05-28 | 中国海洋石油总公司 | Output prediction system for emission hole complete well |
| CN101832673A (en) * | 2010-01-27 | 2010-09-15 | 龚智勇 | Method and device for conducting and recycling subterranean heat with production casings |
| CN202117575U (en) * | 2011-07-07 | 2012-01-18 | 天津滨海世纪能源科技发展有限公司 | Geothermal well formed by reforming petroleum abandoned well |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653148A (en) * | 2014-12-30 | 2015-05-27 | 王作韬 | Well group reforming comprehensive utilization method for waste oil wells |
| CN105804654A (en) * | 2016-03-16 | 2016-07-27 | 中石化绿源地热能开发有限公司 | Novel well bore structure and well completion method for geothermal well |
| CN105804654B (en) * | 2016-03-16 | 2019-02-05 | 中石化绿源地热能开发有限公司 | A kind of novel casing programme of geothermal well and completion method |
| CN107313747A (en) * | 2017-08-17 | 2017-11-03 | 李建峰 | One kind only takes hot ground hot hole pore-fixing device and the method for not fetching water |
| CN109723401A (en) * | 2017-10-27 | 2019-05-07 | 中国石油化工集团公司 | The method that oilfield waste well is transformed into geothermal well |
| CN109723401B (en) * | 2017-10-27 | 2021-10-29 | 中国石油化工集团公司 | Method for reforming abandoned oil well of oil field into geothermal well |
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