CN107143313B - A kind of water filling exploitation of geothermal energy and hydrate are hidden simultaneously well construction design and method - Google Patents

A kind of water filling exploitation of geothermal energy and hydrate are hidden simultaneously well construction design and method Download PDF

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Publication number
CN107143313B
CN107143313B CN201710573416.6A CN201710573416A CN107143313B CN 107143313 B CN107143313 B CN 107143313B CN 201710573416 A CN201710573416 A CN 201710573416A CN 107143313 B CN107143313 B CN 107143313B
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well
branch
hydrate
injection
geothermal
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CN107143313A (en
Inventor
刘永革
侯健
杜庆军
张广福
赵海峰
陆努
刘晓宇
刘璟垚
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China University of Petroleum East China
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China University of Petroleum East China
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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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
    • 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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20—Displacing by water
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well

Abstract

The invention discloses a kind of water filling exploitation of geothermal energy and hydrate are hidden simultaneously well construction designs and method, it mainly include a Ge Shuan branch injection well and a horizontal production well, wherein double branch's injection well injection cold fluids return to hydrate hiding after geothermal layer heats, by self-contained heat transfer to hydrate, promote decomposition of hydrate.Its specific practice is：The well group system being made of double branch's injection wells and horizontal production well is made a call on sea level, wherein double branch's injection wells include that the vertical bore of geothermal layer is extended to from sea level, positioned at the first branch well cylinder of hydrate hiding and positioned at the second branch well cylinder of geothermal layer, cold fluid is injected in the well mouth oil pipe of double branch's injection wells, cold fluid enters oil jacket annulus in the end of the second branch well cylinder and heat exchange occurs with geothermal layer, heating fluid transfers heat to hydrate hiding after entering hydrate hiding, cause decomposition of hydrate, the fluid-mixing of the natural gas and injection fluid composition that decompose generation stitches under gravity and pressure effect through hydraulic fracturing to be produced by horizontal production well.The present invention provides energy using geothermal energy for the decomposition of hydrate, compensates for the deficiencies of traditional thermal excitation extraction system heat utilization efficiency is low, development cost is high, and equipment is simple and convenient to operate, and economy is strong, and the reasonable development that can be hidden for hydrate provides guidance.

Description

A kind of water filling exploitation of geothermal energy and hydrate are hidden simultaneously well construction design and method
Technical field
The present invention relates to a kind of recovery methods of gas hydrates, espespecially establish one by double branch's injection wells and level Produce the well construction design and method of the well group system local use geothermal energy exploitation of gas hydrate hiding of well construction.
Background technique
With a large amount of consumption of petroleum resources, the mankind will face serious crisis of resource in later period 21 century.And geothermal energy Clean energy resource with gas hydrates as rich reserves has caused the extensive concern of scientists from all over the world.
The recovery method that ocean gas hydrate is imagined at present mainly has thermal excitation extraction system, decompression extraction system, chemistry Agent injection method and solids production method.But the above various recovery methods have its own limitation, such as thermal excitation extraction system heat waste Mistake is big, utilization efficiency is low；Decompression extraction system only when hydrate hiding is located near temperature and pressure equilibrium boundary, just there is economically feasible Property；Chemical agent injection method is slow to the effect of hydrate layer and costly.
For the geothermal energy of earth interior by forms such as rock conduction, hot spring, earthquakes to external diffusion, underground heat extraction system is exactly to receive Collect geothermal energy, sea bed gas hydrate is exploited using heat shock forwarding method.Research shows that China South Sea sea bed gas hydrate With geothermal energy resources all very abundants, as can effective use Development of Geothermal Resources gas hydrates can avoid causing environmental pollution, Meet sustainable development requirement.However a kind of method using geothermal energy development gas hydrates is not proposed still at present, Largely constrain the development and utilization of gas hydrates.Present invention proposition establishes one by double branch's injection wells and water The well group system exploitation of geothermal energy on the spot of well construction is produced all one's life, and transfers thermal energy to hydrate hiding, promotes the decomposition of hydrate, The problem that defeated hot cost is too high in traditional thermal excitation extraction system is overcome, equipment is simple and convenient to operate, and economy is strong, can be water The reasonable development for closing object hiding provides guidance.
Summary of the invention
The present invention relates to a kind of water filling exploitation of geothermal energy and hydrate are hidden simultaneously well construction designs and method, mainly include Following steps：
(1) geologic information is hidden according to hydrate, selection top is there are cap rock and there are the regions of geothermal layer to be applied for lower part Work industry, and the geothermal layer temperature is at 100 DEG C or more；
(2) the well group system being made of double branch's injection wells and horizontal production well is made a call on sea level, wherein described double Branch's injection well includes that the vertical bore of geothermal layer is extended to from sea level, is located at hydrate and hides apart from topAt position The first branch well cylinder and be located at geothermal layer apart from top that length is 300~700mLength at position is 300~700m The second branch well cylinder, the horizontal production well be located at hydrate hiding apart from topAt position, and described double points with lower section The first branch well cylinder of branch injection well is parallel；
(3) perforation is carried out respectively to the first branch well cylinder and the horizontal production well of double branch's injection wells, in institute It installs and insulates in oil jacket annulus above Shu Shuan branch the first branch well cylinder of injection well and the vertical bore binding site at 2~5m Device；
(4) hydrate is hidden by the horizontal production well and carries out hydraulic fracturing job, hydrofrac fluid is water packet Oil type emulsion；
(5) cold fluid is injected from the well mouth oil pipe of double branch's injection wells, controls the injection speed of the cold fluid Degree is 100~200m3/ d, the cold fluid enter oil jacket annulus simultaneously in the end of double second branch well cylinders of branch's injection well Heat exchange occurs with geothermal layer, heats fluid and enters hydrate hiding under the barrier of the packer, cause decomposition of hydrate, point The natural gas generated and injection fluid composition fluid-mixing is solved to stitch through hydraulic fracturing by the level under gravity and pressure effect Producing well extraction, in order to reduce the loss of heat in conveying heating flow liquid process, double first branch well cylinders of branch's injection well And the oil pipe and casing of the second vertical well section between branch well cylinder are all made of heat-insulating material, the heat-insulating material is glass fibers Dimension；
(6) the production gas velocity degree of the horizontal production well is persistently recorded, same day gas production is lower than 1000m3When/d, described double points Branch injection well stops injection, and the horizontal production well stops exploitation.
The beneficial effects of the invention are as follows：
It provides energy using geothermal energy for the decomposition of hydrate, compensate for traditional thermal excitation extraction system heat utilization efficiency it is low, The deficiencies of costly.Present device is simple and convenient to operate, and economy is strong, and the reasonable development that can be hidden for hydrate provides guidance.
Detailed description of the invention
Fig. 1 is a kind of water filling well group system schematic that exploitation of geothermal can be hidden with hydrate simultaneously.
Fig. 2 is vertical well section casing programme schematic diagram between double branch's the first branch well cylinders of injection well and the second branch well cylinder.
In figure：1, cap rock；2, gas hydrates；3, geothermal layer；4, casing；5, oil pipe；6, packer；7, it is insulated Layer；8, production level well；9, fluid flow direction；10, hydraulic fracturing is stitched；11, heat transfer direction.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings, but does not limit practical range of the invention.
(1) as shown in Figure 1, according to the geologic information of hydrate hiding 2, selection top is there are cap rock 1 and there are underground heat for lower part The region of layer 3 carries out construction operation, and 3 temperature of geothermal layer is 120 DEG C；
(2) as shown in Figure 1, making a call to the well group system being made of double branch's injection wells and horizontal production well 8 in construction area System is located at hydrate hiding 2 apart from top wherein double branch's injection wells include extending to the vertical bore of geothermal layer 3 from sea levelThe first branch well cylinder and be located at geothermal layer 3 apart from top that length at position is 700mLength at position is the of 700m Two branch well cylinders, horizontal production well 8 are located at hydrate hiding 2 apart from topAt position, and with lower section double branch's injection wells One branch well cylinder is parallel；
(3) as shown in Figure 1, the first branch well cylinder and horizontal production well 8 to double branch's injection wells are penetrated respectively Hole is installed in the oil jacket annulus above double first branch well cylinders of branch's injection well with the vertical bore binding site at 5m Packer 6；
(4) as shown in Figure 1, carrying out hydraulic fracturing job to hydrate hiding 2 by horizontal production well 8, hydrofrac fluid is Oil-in-water emulsion；
(5) as illustrated in fig. 1 and 2, cold fluid is injected from the well mouth oil pipe 5 of double branch's injection wells, controls the cold flow The injection rate of body is 120m3/ d, the cold fluid enter oil jacket in the end of double second branch well cylinders of branch's injection well Simultaneously with geothermal layer 3 heat exchange occurs for annular space, conducts heat direction as shown in 11 in figure, heating fluid enters under the barrier of packer 6 Hydrate hiding 2, causes decomposition of hydrate, and the natural gas and injection fluid composition fluid-mixing for decomposing generation are made in gravity and pressure It is produced through hydraulic fracturing seam 10 by horizontal production well 8 with lower, fluid flow direction is as shown in Figure 9, in order to reduce conveying heating The loss of heat in flow liquid process, vertical well section between double first branch well cylinders of branch's injection well and the second branch well cylinder Oil pipe 5 and casing 4 are all made of heat-insulating material, and 7 material of heat insulation layer is glass fibre；
(6) continue the production gas velocity degree of recording level producing well 8, same day gas production is lower than 1000m3When/d, double branch's injections Well stops injection, and horizontal production well 8 stops exploitation.
The part that do not address in detail above is the common knowledge of those of ordinary skill in the art, and the present invention is not limited to Preferred forms are stated, it is all to have with of the invention anyone should learn that the structure change made under the inspiration of the present invention Same or similar technical solution, falls within the scope of the present invention.

Claims (9)

1. exploitation of geothermal can beat the double branch's injection wells of a bite, including flat from sea with the method for hydrate hiding simultaneously for a kind of water filling Face extends to the vertical bore of geothermal layer, positioned at the first branch well cylinder of hydrate hiding and positioned at the second Multilateral Wells of geothermal layer Cylinder, injection cold fluid carry out heat exchange through double branch's injection wells and geothermal layer, and heating fluid can substantially promote after entering hydrate hiding Into decomposition of hydrate, the fluid-mixing that the natural gas and injection fluid of generation form is under gravity and pressure effect through hydraulic fracturing Seam is produced by upper horizontal producing well, it is characterised in that is included the following steps：
Step (1)：Geologic information is hidden according to hydrate, and selection top is there are cap rock and there are the regions of geothermal layer to be applied for lower part Work industry；
Step (2)：The well group system being made of double branch's injection wells and horizontal production well is made a call on sea level, wherein described double Branch's injection well includes that the vertical bore of geothermal layer is extended to from sea level, is located at hydrate and hides apart from topAt position First branch well cylinder and be located at geothermal layer apart from topThe second branch well cylinder at position, the horizontal production well are located at water Object hiding is closed apart from topAt position, and it is parallel with lower section double first branch well cylinders of branch's injection well；
Step (3)：Perforation is carried out respectively to the first branch well cylinder and the horizontal production well of double branch's injection wells, in institute It installs and insulates in oil jacket annulus above Shu Shuan branch the first branch well cylinder of injection well and the vertical bore binding site at 2~5m Device；
Step (4)：The hydrate is hidden by the horizontal production well and carries out hydraulic fracturing job；
Step (5)：Cold fluid is injected from the well mouth oil pipe of double branch's injection wells, the cold fluid is in double branches The end of the second branch well cylinder of injection well enters oil jacket annulus and heat exchange occurs with geothermal layer, heats fluid in the packer Barrier under enter hydrate hiding, cause decomposition of hydrate, decompose generation natural gas and injection fluid composition fluid-mixing exist It stitches under gravity and pressure effect through hydraulic fracturing and is produced by the horizontal production well；
Step (6)：The production gas velocity degree of the horizontal production well is persistently recorded, same day gas production is lower than 1000m3When/d, described double points Branch injection well stops injection, and the horizontal production well stops exploitation.
2. exploitation of geothermal can be with the method for hydrate hiding simultaneously for a kind of water filling as described in claim 1, which is characterized in that on the spot Using geothermal energy, the problem that defeated hot cost is too high in traditional thermal excitation extraction system is overcome.
3. exploitation of geothermal can be with the method for hydrate hiding simultaneously for a kind of water filling as described in claim 1, which is characterized in that described Oil pipe is not present in first branch well cylinder of double branch's injection wells.
4. exploitation of geothermal can be with the method for hydrate hiding simultaneously for a kind of water filling as described in claim 1, which is characterized in that described Geothermal layer temperature is at 100 DEG C or more.
5. exploitation of geothermal can be with the method for hydrate hiding simultaneously for a kind of water filling as described in claim 1, which is characterized in that described The length of double the first branch well cylinders of branch's injection well and the second branch well cylinder is 300~700m.
6. exploitation of geothermal can be with the method for hydrate hiding simultaneously for a kind of water filling as described in claim 1, which is characterized in that waterpower Fracturing fluid is oil-in-water emulsion.
7. exploitation of geothermal can be with the method for hydrate hiding simultaneously for a kind of water filling as described in claim 1, which is characterized in that described The oil pipe and casing of vertical well section between double the first branch well cylinders of branch's injection well and the second branch well cylinder are all made of heat-insulating material To reduce the loss for conveying heat in heating flow liquid process.
8. exploitation of geothermal can be with the method for hydrate hiding simultaneously for a kind of water filling as claimed in claim 1 or 7, which is characterized in that The heat-insulating material of double branch's injection wells is glass fibre.
9. exploitation of geothermal can be with the method for hydrate hiding simultaneously for a kind of water filling as described in claim 1, which is characterized in that double points The fluid injection rate of branch injection well is 100~200m3/d。
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WO2023059896A1 (en) * 2021-10-08 2023-04-13 Global Energy Venture Llc Geothermal heating of hydrocarbon reservoirs for in situ recovery

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CN108005626B (en) * 2017-11-27 2020-11-24 华南理工大学 Natural gas hydrate exploitation device and method based on heat pipe technology
CN109882133A (en) * 2019-03-06 2019-06-14 大连理工大学 A kind of device and method using discarded high temperature and pressure gas reservoir exploitation gas hydrates
CN109736754A (en) * 2019-03-06 2019-05-10 大连理工大学 A kind of device and method using hot dry rock exploitation of gas hydrate
CN109958410A (en) * 2019-03-06 2019-07-02 大连理工大学 A kind of device and method closing object using individual well joint underground heat production of water
CN109915083B (en) * 2019-04-09 2020-07-17 中国石油大学(北京) Deepwater natural gas hydrate injection and production system and deepwater natural gas hydrate injection and production method
CN111271035B (en) * 2020-02-13 2021-10-26 中国石油大学(华东) Natural gas hydrate exploitation well structure
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