CN105804654A - Novel well bore structure and well completion method for geothermal well - Google Patents
Novel well bore structure and well completion method for geothermal well Download PDFInfo
- Publication number
- CN105804654A CN105804654A CN201610149818.9A CN201610149818A CN105804654A CN 105804654 A CN105804654 A CN 105804654A CN 201610149818 A CN201610149818 A CN 201610149818A CN 105804654 A CN105804654 A CN 105804654A
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- well
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- pipe
- sealing
- well cementation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention aims to provide a well completion method to overcome existing technical defects. According to the well completion method, a casing string is put into a drilled borehole according to design standards, and cement is poured into the well wall annulus of a well so that the well bore design quality can be ensured. The well completion method mainly depends on the grading well cementation technique and the water stopping technology of a geothermal well, cement is poured into an annulus between a second-opening borehole water taking section and a casing through an outer casing packer, a classification hoop and other components, and the effect of permanent separation and water stopping is achieved. The invention further provides a novel well bore structure for the geothermal well. The well bore structure is a perpendicular drilling well structure. A surface casing, a well fixing section and a production casing are sequentially arranged from the ground to the well bottom. The surface casing is arranged from the ground to the well fixing section, and one section of the upper end of the well fixing section is wrapped with the surface casing in the circumferential direction. The well fixing section is composed of a wellhead well fixing section body and a well bore well fixing section body. The adopted structure has the following advantages that permanent water stopping of the geothermal well can be achieved, surface water can be protected permanently, heat losses of a production well can be reduced, and the heat preservation effect is achieved.
Description
Technical field
The present invention relates to geothermal well well bore technical field, particularly to a kind of geothermal well Novel well body structure and completion method.
Background technology
Geothermal energy resources include " 13 " ENERGY PLANNING in as a kind of regenerative resource.How to develop one of the strategy that geothermal energy resources are national energy industrial patterns.Effectively go out, from underground mining, the major subjects that our required geothermal energy resources are underground heat worker research.
The research of geothermal well well structure design and completion mode is an important step in geothermal well shaft building process, is also be connected drilling well and exploitation and a systematic engineering of business relatively independent again.
The quality of geothermal well well structure design and completion mode technology will directly affect the water temperature water yield and service efficiency, so we will consider from on-the-spot angle and study and solve geothermal well casing programme and completion mode technology, and shall prevent cave-in, improve the water temperature water yield, reduce sand content, prolongedly hot well service life as technological staff, strive constantly promoting geothermal well well structure design and completion mode from technical research aspect.
Current sandstone geothermal well becomes well construction to have two kinds: one is two opening structures, and one opens well cementing of cement, and two exploitation water-stops add filter pipe hole protecting method；Another kind is three opening structures, and one opens and two exploitation well cementing of cement, and three open filter pipe completion mode Cheng Jing.
Above two becomes well construction to be respectively arranged with drawback, the first two opening structure, and well is simple, expense is little for one-tenth, but the method for employing water-stop sealing is temporary leaking water after all, it is difficult to ensure sealing quality.The second three opening structure, Cheng Jingxiao is better, but costly, long in time limit, becomes well complicated.
Summary of the invention
For solving above-mentioned prior art defect, it is an object of the invention to provide a kind of geothermal well Novel well body structure and completion method, it by entering sleeve string under design standard, and injects cement at its borehole wall annular space in the well being drilled to, to ensure well bore designing quality.It mainly relies on the sealing technique of fraclional well cementing technology and geothermal well, adopts the parts such as external packer of pipe, sizing collar to drive a well eye water intaking section to two with the annular space injection cement between shallow and sleeve pipe, it is achieved permanent separation sealing.
Its technical scheme is: a kind of geothermal well Novel well body structure, this casing programme is vertical drilling, it is characterized in that, it is disposed with surface pipe to shaft bottom from ground, well cementation section and production casing, surface pipe is by ground to the section of well cementation, and one section, the upper end of well cementation section is wrapped circumferentially around, well cementation section is made up of well head well cementation section and well bore well cementation section, well head well cementation section includes hanger, hang base, annular space sealing, surplus sealing and well cementation protection pipe nipple, hanger is positioned on suspension base, centre has a surplus to form rabbet channel, the top surplus sealing of hanger, the inner side of surplus sealing is well cementation protection pipe nipple, the lower end of annular space sealing is well bore well cementation section, well bore well cementation section is by cement sealing district, its built-in production casing.
Preferably, described production casing is from top to bottom disposed with hydraulic stage-cementing device, external packer of pipe, adopt filling water-stop, blind plate, one-level water-stop, bag net filament wrapped filter pipe and two grades of injectors, described hydraulic stage-cementing device is arranged on inside production casing, and classification section from the bottom to top carries out cement sealing, and external packer of pipe is positioned at the lower section of well bore well cementation section, the lower section of external packer of pipe is blind plate, is adopt filling water-stop between external packer of pipe and blind plate.
Preferably, described surface pipe adopts internal diameterSurface pipe, its external diameter is
Preferably, described production casing adopts internal diameterSurface pipe, its external diameter is
Preferably, described bag net filament wrapped filter pipe adopts internal diameterBag net filament wrapped filter pipe.
The invention provides the completion method of a kind of geothermal well Novel well body structure, it is characterised in that method step is as follows:
1) bottom production casing, guide shoe has been constructed；
2) adopt two opening structures to set up and production casing pipe string as claimed in claim 2 is installed, from top to bottom it is disposed with hydraulic stage-cementing device, external packer of pipe, adopt filling water-stop, blind plate, one-level water-stop, bag net filament wrapped filter pipe and two grades of injectors, described hydraulic stage-cementing device is arranged on inside production casing, classification section from the bottom to top carries out cement sealing, external packer of pipe is positioned at the lower section of well bore well cementation section, the lower section of external packer of pipe is blind plate, is adopt filling water-stop between external packer of pipe and blind plate；
3) by step 2) set up the production casing pipe string installed and put into precalculated position, and successfully hang setting；
4) adopt step 2) in hydraulic stage-cementing device classification structure note well bore well cementation section cement sealing district；
5) step 4) setting up the sleeve pipe overlap well cementation section installing as claimed in claim 1 section of cementing the well after completion；
6) step 6) completion after from protection pipe nipple go out back-off send into drilling tool, circulation replace out unnecessary cementing concrete amount, finally bore open blind plate complete clean-out service；
7) completion is gone into operation.
7. the completion method of a kind of geothermal well Novel well body structure according to claim 6, is characterized in that, step 5) sleeve pipe overlap well cementation section establishment installation steps as follows:
1) on the top in cement sealing district along the outside structure note annular space sealing of one section, production casing upper end, the top of annular space sealing maintains an equal level with protection pipe nipple top；
2) installing suspension base in annular space sealing, hang base and be arranged to the wedge shape with right angle, right-angle side side is connected with surface pipe, its wedge shape plate is the obcuneate hanger with right angle, has a surplus to form rabbet channel in the middle of both；
3) forming one section of surplus sealing in the upper end of hanger, the inner side of surplus sealing is well cementation protection pipe nipple, and the upper end of well cementation protection pipe nipple upwardly extends one section and shields；
4) step 3) completion after from protection pipe nipple go out back-off send into drilling tool, circulation replace out unnecessary cementing concrete amount, finally bore open blind plate complete clean-out service.
Preferably, described guide shoe is tilted inside well by the borehole wall.
Technique has the advantage that
1) can permanent sealing for geothermal well；
2) can forever protect for superficial water；
3) for producing well, it is possible to accurately stratified pumping；
4) for inverted well, it is possible to layering is recharged；
5) thermal losses can be reduced for producing well, play heat insulation effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Detailed description of the invention
For the purpose of the embodiment of the present invention, technical scheme and advantage clearly; below in conjunction with the accompanying drawing in the embodiment of the present invention; technical scheme in the present invention is clearly and completely described; obviously; described embodiment is a part of embodiment of the present invention, rather than whole embodiments, based on embodiments of the invention; other embodiments that those skilled in the art is acquired under the premise not paying creative work, broadly fall into the protection domain of patent of the present invention.
With reference to Fig. 1, a kind of geothermal well Novel well body structure, this casing programme is vertical drilling, it is characterized in that, surface pipe 1 it is disposed with from ground to shaft bottom, well cementation section and production casing 8, surface pipe 1 is by ground to the section of well cementation, and one section, the upper end of well cementation section is wrapped circumferentially around, well cementation section is made up of well head well cementation section and well bore well cementation section, well head well cementation section includes hanger 4, hang base 5, annular space sealing 17, surplus sealing 3 and well cementation protection pipe nipple 2, hanger 4 is positioned on suspension base 5, centre has a surplus to form rabbet channel 6, the top surplus sealing 3 of hanger 4, the inner side of surplus sealing 3 is well cementation protection pipe nipple 2, the lower end of annular space sealing 7 is well bore well cementation section, well bore well cementation section is by cement sealing district 7, its built-in production casing 8.
Preferably, described production casing 1 is from top to bottom disposed with hydraulic stage-cementing device 9, external packer of pipe 10, adopt filling water-stop 11, blind plate 12, one-level water-stop 13, bag net filament wrapped filter pipe 14 and two grades of injectors 15, it is internal that described hydraulic stage-cementing device 9 is arranged on production casing 8, classification section from the bottom to top carries out cement sealing, external packer of pipe 10 is positioned at the lower section of well bore well cementation section, the lower section of external packer of pipe 10 is blind plate 12, is adopt filling water-stop 11 between external packer of pipe 10 and blind plate 12.
Preferably, described surface pipe 1 adopts internal diameterSurface pipe, its external diameter is
Preferably, described production casing 8 adopts internal diameterSurface pipe, its external diameter is
Preferably, described bag net filament wrapped filter pipe 14 adopts internal diameterBag net filament wrapped filter pipe.
The invention provides the completion method of a kind of geothermal well Novel well body structure, it is characterised in that method step is as follows:
1) bottom production casing, guide shoe 16 has been constructed；
2) adopt two opening structures to set up and production casing pipe string as claimed in claim 2 is installed, from top to bottom it is disposed with hydraulic stage-cementing device 9, external packer of pipe 10, adopt filling water-stop 11, blind plate 12, one-level water-stop 13, bag net filament wrapped filter pipe 14 and two grades of injectors 15, it is internal that described hydraulic stage-cementing device 9 is arranged on production casing 8, classification section from the bottom to top carries out cement sealing, external packer of pipe 10 is positioned at the lower section of well bore well cementation section, the lower section of external packer of pipe 10 is blind plate 12, it is adopt filling water-stop 11 between external packer of pipe 10 and blind plate 12；
3) by step 2) set up the production casing pipe string installed and put into precalculated position, and successfully hang setting 16；
4) adopt step 2) in hydraulic stage-cementing device 9 classification structure note well bore well cementation section cement sealing district 7；
5) step 4) setting up the sleeve pipe overlap well cementation section installing as claimed in claim 1 section of cementing the well after completion；
6) step 6) completion after from protection pipe nipple 2 back-off send into drilling tool, circulation replace out unnecessary cementing concrete amount, finally bore open blind plate 9 complete clean-out service；
7) completion is gone into operation.
Preferably, step 5) well head well cementation section establishment installation steps as follows:
1) on the top in cement sealing district 7 along the outside structure note annular space sealing 17 of one section, production casing 1 upper end, the top of annular space sealing 17 is fair with the top of protection pipe nipple 1；
2) installing suspension base 5 in annular space sealing 17, hang base 5 and be arranged to the wedge shape with right angle, right-angle side side is connected with surface pipe 1, its wedge shape plate is the obcuneate hanger 4 with right angle, has a surplus to form rabbet channel 6 in the middle of both；
3) forming one section of surplus sealing 3 in the upper end of hanger 4, the inner side of surplus sealing 3 is well cementation protection pipe nipple 2, and the upper end of well cementation protection pipe nipple 2 upwardly extends one section and shields；
4) step 3) completion after from protection pipe nipple 2 back-off send into drilling tool, circulation replace out unnecessary cementing concrete amount, finally bore open blind plate 9 complete clean-out service.
Preferably, described guide shoe 16 is tilted inside well by the borehole wall.
Its know-why is, opens surface pipe 1 at next and enters to hang base at present, opens the micro-step of sleeve pipe in order to two and hangs.Two end well after; utilize drilling rod to send two to drive sleeve pipe and enter well suspension: pipe string structure is that guide shoe 16+ water intaking section pipe string+blind plate 12+ external packer of pipe 10+ hydraulic stage-cementing device 9+ protective casing+hanger 4+ well cementation protection pipe nipple 2+ sends into drilling tool; wherein in water intaking section, simple and easy broad-mouthed receptacle for holding liquid formula water-stop is installed; position is stratum boundary or company's scientific research appointment position, mainly in order to detect geothermal well supply, runoff and excretion.Owing to one drives sleeve pipe and enters to hang base down, when bunch tube arrives precalculated position, utilize sleeve pipe suspending weight judges to run through whether hang by predetermined operation.Guaranteeing that sleeve pipe hangoff receptacle is honored as a queen, rotate forward drilling rod, open from well cementation protection pipe nipple 2, tripping out drilling rod, protection pipe nipple 2 stays well.Adjust mud property, unload kelly bar stacks cementing head (plug loads in advance), connect well cementation pipeline, pipeline water flowing pressure testing of cementing the well；Building the pressure and utilize waterpower opening type structure and external packer of pipe 10 to have certain pressure reduction level to open sizing collar, in adopting plug to replace, the outer form returned of note carries out cement injection operation by design；After cemented up slurry, discharge drilling rod plug, with cement mortar top plug；For mud to bruising, pressure release, check backflow.Now having confirmed that cement mortar has returned to annular space and formed one section of surplus sealing 3 in the upper end of hanger 4, the inner side of surplus sealing 3 is well cementation protection pipe nipple 2, and the upper end of well cementation protection pipe nipple 2 upwardly extends one section and shields.Unloading cementing head, connect kelly bar, pressure of spraining, slowly lift up drilling tool, when pump pressure declines, turn on pump rinses superfluous water mud, rotates and spudding up and down in cyclic process, it is ensured that circulation is clean；Pull out of hole, Hou Ning, complete whole anchorage.The mode that acoustically radiating is surveyed in well cementation is finally utilized to carry out well cementation detection.To be detected qualified after, lower bore bore open blind plate 12 carry out clean-out service until hand over well.
Claims (8)
1. a geothermal well Novel well body structure, this casing programme is vertical drilling, it is characterized in that, it is disposed with surface pipe to shaft bottom from ground, well cementation section and production casing, surface pipe is by ground to the section of well cementation, and one section, the upper end of well cementation section is wrapped circumferentially around, well cementation section is made up of sleeve pipe overlap well cementation section and well bore well cementation section, sleeve pipe overlap well cementation section includes hanger, hang base, annular space sealing, surplus sealing and well cementation protection pipe nipple, hanger is positioned on suspension base, centre has a surplus to form rabbet channel, the top surplus sealing of hanger, the inner side of surplus sealing is well cementation protection pipe nipple, the lower end of annular space sealing is well bore well cementation section, well bore well cementation section is by cement sealing district, its built-in production casing.
2. a kind of geothermal well Novel well body structure according to claim 1, it is characterized in that, described production casing is from top to bottom disposed with hydraulic stage-cementing device, external packer of pipe, adopt filling water-stop, blind plate, one-level water-stop, bag net filament wrapped filter pipe and two grades of injectors, described hydraulic stage-cementing device is arranged on inside production casing, classification section from the bottom to top carries out cement sealing, external packer of pipe is positioned at the lower section of well bore well cementation section, the lower section of external packer of pipe is blind plate, is adopt filling water-stop between external packer of pipe and blind plate.
3. a kind of geothermal well Novel well body structure according to claim 1, is characterized in that, described surface pipe adopts internal diameterSurface pipe, its external diameter is
4. a kind of geothermal well Novel well body structure according to claim 1, is characterized in that, described production casing adopts internal diameterSurface pipe, its external diameter is
5. a kind of geothermal well Novel well body structure according to claim 2, is characterized in that, described bag net filament wrapped filter pipe adopts internal diameterBag net filament wrapped filter pipe.
6. the completion method of a geothermal well Novel well body structure, it is characterised in that method step is as follows:
1) bottom production casing, guide shoe has been constructed；
2) adopt two opening structures to set up and production casing pipe string as claimed in claim 2 is installed, from top to bottom it is disposed with hydraulic stage-cementing device, external packer of pipe, adopt filling water-stop, blind plate, one-level water-stop, bag net filament wrapped filter pipe and two grades of injectors, described hydraulic stage-cementing device is arranged on inside production casing, classification section from the bottom to top carries out cement sealing, external packer of pipe is positioned at the lower section of well bore well cementation section, the lower section of external packer of pipe is blind plate, is adopt filling water-stop between external packer of pipe and blind plate；
3) by step 2) set up the production casing pipe string installed and put into precalculated position, and successfully hang setting；
4) adopt step 2) in hydraulic stage-cementing device classification structure note well bore well cementation section cement sealing district；
5) step 4) setting up the sleeve pipe overlap well cementation section installing as claimed in claim 1 section of cementing the well after completion；
6) step 6) completion after from protection pipe nipple go out back-off send into drilling tool, circulation replace out unnecessary cementing concrete amount, finally bore open blind plate complete clean-out service；
7) completion is gone into operation.
7. the completion method of a kind of geothermal well Novel well body structure according to claim 6, is characterized in that, step 5) sleeve pipe overlap well cementation section establishment installation steps as follows:
1) on the top in cement sealing district along the outside structure note annular space sealing of one section, production casing upper end, the top of annular space sealing maintains an equal level with protection pipe nipple top；
2) installing suspension base in annular space sealing, hang base and be arranged to the wedge shape with right angle, right-angle side side is connected with surface pipe, its wedge shape plate is the obcuneate hanger with right angle, has a surplus to form rabbet channel in the middle of both；
3) forming one section of surplus sealing in the upper end of hanger, the inner side of surplus sealing is well cementation protection pipe nipple, and the upper end of well cementation protection pipe nipple upwardly extends one section and shields；
4) step 3) completion after from protection pipe nipple go out back-off send into drilling tool, circulation replace out unnecessary cementing concrete amount, finally bore open blind plate complete clean-out service.
8. the completion method of a kind of geothermal well Novel well body structure according to claim 6, is characterized in that, described employing two opening structure complete two drive a well eye water intaking section realize permanent separation water-stopping method with the annular space between shallow and sleeve pipe.
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| CN201610149818.9A CN105804654B (en) | 2016-03-16 | 2016-03-16 | A kind of novel casing programme of geothermal well and completion method |
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| CN201610149818.9A CN105804654B (en) | 2016-03-16 | 2016-03-16 | A kind of novel casing programme of geothermal well and completion method |
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| CN105804654B CN105804654B (en) | 2019-02-05 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948795A (en) * | 2017-03-30 | 2017-07-14 | 中国石油大学(北京) | A kind of method that multi-branched horizontal well closed cycle develops hot water type underground heat |
| CN107191143A (en) * | 2017-06-23 | 2017-09-22 | 天津世纪天源集团股份有限公司 | Lower filling well device and production practice are adopted in one kind |
| 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 |
| CN108222821A (en) * | 2018-01-04 | 2018-06-29 | 河北绿源地热能开发有限公司 | A kind of well drilling technology suitable for middle low temperature geothermal well |
| CN109156303A (en) * | 2018-08-16 | 2019-01-08 | 浙江普天园林建筑发展有限公司 | A kind of water-saving garden landscape method of construction |
| CN109519149A (en) * | 2018-09-28 | 2019-03-26 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas passes through the full well cementing method of goaf well |
| CN109826598A (en) * | 2019-03-22 | 2019-05-31 | 陕西绿源地热能开发有限公司 | A kind of method of sandstone geothermal well hierarchical-development |
| CN110185429A (en) * | 2019-05-09 | 2019-08-30 | 陕西绿源地热能开发有限公司 | A kind of sandstone geothermal well casing programme |
| WO2021102829A1 (en) * | 2019-11-28 | 2021-06-03 | 深圳大学 | Borehole wall protection assembly, device, and method |
| CN113107367A (en) * | 2021-04-02 | 2021-07-13 | 中石化绿源地热能(陕西)开发有限公司 | Same-well same-layer mining and irrigating well completion method |
| CN114876439A (en) * | 2022-06-28 | 2022-08-09 | 张�林 | Geothermal well body structure for well wall heat exchange and well cementation method |
| TWI805036B (en) * | 2021-10-21 | 2023-06-11 | 結元能源開發股份有限公司 | A material for acid resistant cementation of geothermal well and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948795A (en) * | 2017-03-30 | 2017-07-14 | 中国石油大学(北京) | A kind of method that multi-branched horizontal well closed cycle develops hot water type underground heat |
| US10401056B2 (en) | 2017-03-30 | 2019-09-03 | China University Of Petroleum-Beijing | Hydrothermal geothermal development method of multilateral well closed circulation |
| CN107191143A (en) * | 2017-06-23 | 2017-09-22 | 天津世纪天源集团股份有限公司 | Lower filling well device and production practice are adopted in one kind |
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| 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 |
| CN108222821B (en) * | 2018-01-04 | 2019-06-28 | 河北绿源地热能开发有限公司 | A kind of well drilling technology suitable for middle low temperature geothermal well |
| CN108222821A (en) * | 2018-01-04 | 2018-06-29 | 河北绿源地热能开发有限公司 | A kind of well drilling technology suitable for middle low temperature geothermal well |
| CN109156303B (en) * | 2018-08-16 | 2021-11-16 | 杭州市园林绿化股份有限公司 | Water-saving type garden landscape building method |
| CN109156303A (en) * | 2018-08-16 | 2019-01-08 | 浙江普天园林建筑发展有限公司 | A kind of water-saving garden landscape method of construction |
| CN109519149A (en) * | 2018-09-28 | 2019-03-26 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas passes through the full well cementing method of goaf well |
| CN109826598A (en) * | 2019-03-22 | 2019-05-31 | 陕西绿源地热能开发有限公司 | A kind of method of sandstone geothermal well hierarchical-development |
| CN110185429A (en) * | 2019-05-09 | 2019-08-30 | 陕西绿源地热能开发有限公司 | A kind of sandstone geothermal well casing programme |
| WO2021102829A1 (en) * | 2019-11-28 | 2021-06-03 | 深圳大学 | Borehole wall protection assembly, device, and method |
| CN113107367A (en) * | 2021-04-02 | 2021-07-13 | 中石化绿源地热能(陕西)开发有限公司 | Same-well same-layer mining and irrigating well completion method |
| CN113107367B (en) * | 2021-04-02 | 2023-09-26 | 中石化绿源地热能(陕西)开发有限公司 | Same-well same-layer mining and irrigation well completion method |
| TWI805036B (en) * | 2021-10-21 | 2023-06-11 | 結元能源開發股份有限公司 | A material for acid resistant cementation of geothermal well and method thereof |
| CN114876439A (en) * | 2022-06-28 | 2022-08-09 | 张�林 | Geothermal well body structure for well wall heat exchange and well cementation method |
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