CN113513298A - Hot dry rock branch well same-well synchronous injection-production method and injection-production device - Google Patents
Hot dry rock branch well same-well synchronous injection-production method and injection-production device Download PDFInfo
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- CN113513298A CN113513298A CN202110888882.XA CN202110888882A CN113513298A CN 113513298 A CN113513298 A CN 113513298A CN 202110888882 A CN202110888882 A CN 202110888882A CN 113513298 A CN113513298 A CN 113513298A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 180
- 239000011435 rock Substances 0.000 title claims abstract description 58
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 140
- 239000007924 injection Substances 0.000 claims abstract description 140
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 9
- OWZREIFADZCYQD-NSHGMRRFSA-N deltamethrin Chemical compound CC1(C)[C@@H](C=C(Br)Br)[C@H]1C(=O)O[C@H](C#N)C1=CC=CC(OC=2C=CC=CC=2)=C1 OWZREIFADZCYQD-NSHGMRRFSA-N 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000007667 floating Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 2
- 206010017076 Fracture Diseases 0.000 description 10
- 208000010392 Bone Fractures Diseases 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 208000013201 Stress fracture Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000003832 thermite Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a synchronous injection and production method and an injection and production device for a branch well of a dry hot rock, wherein the injection and production method comprises the following steps: drilling: drilling a main well, an upper branch injection well and a lower branch production well, wherein the upper branch injection well and the lower branch production well are communicated with the main well, an injection horizontal well of the upper branch injection well and a production horizontal well of the lower branch production well are positioned in a dry hot rock reservoir, and the injection horizontal well is positioned above the production horizontal well; a fracturing step: carrying out crack-up control fracturing on the injection horizontal well, carrying out crack-down control fracturing on the production horizontal well, and forming an artificial crack between the injection horizontal well and the production horizontal well; and (3) injection and production steps: injecting low-temperature water into the upper branch injection well, and pumping out the high-temperature mixture entering the lower branch production well through a lifting pump. The high-temperature mixture in the lower branch production well can be pumped out by the lifting pump while injecting low-temperature water into the upper branch injection well, so that synchronous circulating injection and production are realized, and the injection and production efficiency is greatly improved.
Description
Technical Field
The invention relates to the field of dry hot rock exploitation, in particular to a dry hot rock branch well same-well synchronous injection and production method and an injection and production device.
Background
The Hot Dry Rock (Hot Dry Rock, HDR) is a storage medium for heat energy in the earth, and since the us Los Alamos national laboratory proposed the concept of Hot Dry Rock heat energy in the 70 th 20 th century, the definition of Hot Dry Rock is continuously developing, and the latest definition of Hot Dry Rock in geothermal energy terminology is that an abnormally high temperature Rock mass with no or only a small amount of fluid in the interior and a temperature higher than 180 ℃. According to conservative estimation, the energy contained in the dry heat rock (usually 3-10 km deep) in the crust is 30 times of the energy contained in all petroleum, natural gas and coal in the world. Evaluation data of the Chinese geological survey bureau show that the total amount of hot and dry rock resources at a depth of 3-10 km in the Chinese continent is 2.5 multiplied by 1025J (856 trillion standard coals), and if 2% of the hot and dry rock resources can be mined, the total amount of the hot and dry rock resources is 4400 times of the total amount of disposable energy consumption in 2015 years in China.
The development of conventional hot dry rock resources mainly utilizes an Enhanced Geotherm System (EGS) to extract heat inside the System. The enhanced geothermal system forms artificial cracks in underground deep low-permeability high-temperature rock bodies through engineering means such as hydraulic fracturing, water is injected through the recharge well, the injected water moves along reservoir cracks and joints or artificial seam networks and exchanges heat with surrounding rocks, and high-temperature high-pressure water or a water-vapor mixture is generated. After high-temperature steam is extracted from the production well to the ground, the high-temperature steam is used for power generation and comprehensive utilization through heat exchange and a ground circulating device. The utilized warm water is injected into the underground dry and hot rock mass through the recharging well, so that the aim of recycling is fulfilled. Hydraulic fracturing has become a key tool in the development of enhanced geothermal systems in order to increase geothermal resource utilization. In the prior art, injection and production are usually carried out in a double-well matching mode, the requirements on the areas of drilling wells and injection and production well sites are large, and the construction cost is high; in the fracturing process, how hydraulic fractures form an optimized and maximized enhanced geothermal system in space is not clear, and the problems of low utilization rate of geothermal resources and the like exist, so that the commercial application of development of a dry-hot rock reservoir is restricted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a synchronous injection and production method and an injection and production device for a branch well of dry hot rock.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for synchronously injecting and extracting the hot dry rock branch well from the same well is provided, and comprises the following steps:
drilling: drilling a main well, an upper branch injection well and a lower branch production well, wherein the upper branch injection well and the lower branch production well are communicated with the main well, an injection horizontal well of the upper branch injection well and a production horizontal well of the lower branch production well are positioned in a dry hot rock reservoir, and the injection horizontal well is positioned above the production horizontal well;
a fracturing step: carrying out crack-up control fracturing on the injection horizontal well, carrying out crack-down control fracturing on the production horizontal well, and forming an artificial crack seam net structure between the injection horizontal well and the production horizontal well;
and (3) injection and production steps: injecting low-temperature water into the upper branch injection well, and pumping out the high-temperature mixture entering the lower branch production well through a lifting pump.
In the synchronous injection and production method for the hot dry rock branch well in the same well, the fracturing steps are as follows:
performing crack control on an injection horizontal well, and forming an asymmetric first upper crack and a first lower crack above and below the injection horizontal well respectively, wherein the height of the first upper crack is less than that of the first lower crack;
and carrying out lower seam control fracturing on the production horizontal well, and respectively forming an asymmetric second upper seam and a second lower seam above and below the production horizontal well, wherein the height of the second upper seam is greater than that of the second lower seam.
In the method for synchronously injecting and extracting the hot dry rock branch well in the same well, the method for implementing crack-controlling fracturing on the injection horizontal well comprises the following steps:
injecting a floating diverting agent into the fracturing fluid;
in the upper seam control fracturing process, the upward extension of the first upper seam is controlled through the floating diverting agent;
the method for implementing the lower seam control fracturing on the production horizontal well specifically comprises the following steps:
injecting a sinking diverting agent into the fracturing fluid;
and in the lower seam control fracturing process, the second lower seam is controlled to extend downwards through the sinking diverting agent.
In the synchronous injection and production method of the branch well of the dry hot rock in the same well, the injection and production steps further comprise:
lowering a production string and a lifting pump into the downward branch production well;
and a packer for plugging an annular area is arranged at the joint of the main well and the lower branch production well, and the packer is fixedly sleeved outside the production pipe column.
In the method for synchronously injecting and producing the hot dry rock branch well in the same well, the connecting port of the upper branch injection well and the main well is positioned above the packer.
In the synchronous injection and production method of the hot dry rock branch well in the same well, the production pipe column comprises a heat insulation oil pipe arranged in the main well and a common oil pipe arranged in the lower branch production well, and the heat insulation oil pipe and the common oil pipe are fixedly connected and communicated.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a synchronous injection and production device of a hot dry rock branch well in the same well, wherein the injection and production device comprises a main well, an upper branch injection well communicated with the main well and a lower branch production well communicated with the main well, an injection horizontal well of the upper branch injection well and a production horizontal well of the lower branch production well are both positioned in a hot dry rock reservoir, and the injection horizontal well is positioned above the production horizontal well;
the injection and production device also comprises upper seam control fracturing equipment which can be put into the injection horizontal well to control upper seam fracturing, lower seam control fracturing equipment which can be put into the production horizontal well to control lower seam fracturing, a production pipe column which can be put into the lower branch production well and a lifting pump.
In the synchronous injection and production device for the hot dry rock branch well and the well, the injection and production device further comprises a packer fixedly sleeved outside the production pipe column and used for plugging an annular area, and the packer is arranged at the joint of the main well and the lower branch production well.
In the synchronous injection and production device for the hot dry rock branch well and the same well, the production pipe column comprises a heat insulation oil pipe arranged in the main well and a common oil pipe arranged in the lower branch production well, and the heat insulation oil pipe and the common oil pipe are fixedly connected and communicated.
In the synchronous injection and extraction device for the hot dry rock branch well and the same well, the lifting pump is a high-temperature resistant lifting pump, and the packer is a high-pressure and high-temperature resistant recyclable packer.
The implementation of the synchronous injection and production method and the synchronous injection and production device for the branch well of the dry hot rock of the invention has the following beneficial effects: when the method for synchronously injecting and extracting the branch wells of the dry hot rock is implemented, the upper branch injection well and the lower branch production well are respectively arranged in the dry hot rock storage layer and share the main well, and the upper crack control fracturing and the lower crack control fracturing are respectively implemented on the injection horizontal well and the production horizontal well in the process of manual fracturing, so that a manual crack seam network structure can be formed between the injection horizontal well and the production horizontal well, and the formation of large cracks above the injection horizontal well and below the production horizontal well can be avoided, and safety accidents are induced. When injection and production are carried out, low-temperature water can be injected into the upper branch injection well, the low-temperature water enters the horizontal production well from a crack between the injection horizontal well and the production horizontal well and exchanges heat with the hot dry rock reservoir, the low-temperature water absorbing heat of the hot dry rock reservoir is changed into a high-temperature water-vapor mixture and enters the horizontal production well, and finally the high-temperature water-vapor mixture is lifted out of the main well by the lifting pump for development and utilization. In this application, can pour into the low-temperature water in the well into in the branch that makes progress, take out the high temperature mixture in the production well of branch down through the lift pump, realize the synchronous cycle and annotate and adopt, improved notes greatly and adopted efficiency, reduced development cost simultaneously.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic flow chart of a synchronous injection and production method for a dry hot rock branch well in the same well according to the invention;
FIG. 2 is a schematic structural diagram of the synchronous injection and production device for the hot dry rock branch well.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of the method for injecting and producing hot dry rock into a branch well synchronously, the method comprises the following steps:
s101, drilling: drilling a main well 10, an upper branch injection well 11 and a lower branch production well 12, wherein the upper branch injection well 11 and the lower branch production well 12 are communicated with the main well 10, an injection horizontal well 13 of the upper branch injection well 11 and a production horizontal well 14 of the lower branch production well 12 are positioned in the thermite reservoir 100, and the injection horizontal well 13 is positioned above the production horizontal well 14;
s102, fracturing step: performing crack-up control fracturing on the injection horizontal well 13, performing crack-down control fracturing on the production horizontal well 14, and forming an artificial crack between the injection horizontal well 13 and the production horizontal well 14;
s103, injection-production step: low temperature water is injected into the upper branch injection well 11 and high temperature mixture entering the lower branch production well 12 is pumped out by lift pump 16.
When the synchronous injection and production method of the hot dry rock branch well is implemented, the upper branch injection well 11 and the lower branch production well 12 are respectively arranged in the hot dry rock reservoir 100, the upper branch injection well 11 and the lower branch production well 12 share the main well 10, and in the process of artificial fracturing, crack-controlling fracturing on an upper crack and crack-controlling fracturing on a lower crack are respectively implemented on the injection horizontal well 13 and the production horizontal well 14, so that an artificial crack can be formed between the injection horizontal well 13 and the production horizontal well 14, and large cracks above the injection horizontal well 13 and below the production horizontal well 14 can be avoided, and safety accidents are induced. When injection and production are carried out, low-temperature water can be injected into the upper branch injection well 11, the low-temperature water enters the horizontal production well from a crack between the injection horizontal well 13 and the production horizontal well 14 and exchanges heat with the hot dry rock reservoir 100, the low-temperature water absorbing heat of the hot dry rock reservoir 100 is changed into high-temperature water-vapor mixture and enters the horizontal production well, and finally the high-temperature water-vapor mixture is lifted out of the main well 10 by the lifting pump 16 for development and utilization. In this application, can be when injecting the low temperature water into the branch injection well 11 that makes progress, take out the high temperature mixture in the branch production well 12 down through lifting pump 16, realize synchronous cycle injection and adopt, improved the injection greatly and adopted efficiency, reduced development cost simultaneously.
In this application, through injecting the well into and set up in the producing well top, can be convenient for water from highly flowing to the low, improve the efficiency of cycle recovery.
In this embodiment, the fracturing step is specifically:
and performing crack control fracturing on the injection horizontal well 13, and forming an asymmetric first upper crack 20 and a first lower crack 21 above and below the injection horizontal well 13 respectively, wherein the height of the first upper crack 20 is smaller than that of the first lower crack 21. And performing fracture-controlled fracturing on the production horizontal well 14, and forming an asymmetric second upper seam 23 and a second lower seam 22 above and below the production horizontal well 14 respectively, wherein the height of the second upper seam 23 is greater than that of the second lower seam 22.
The steps of controlling the upper seam fracturing and controlling the lower seam fracturing are not sequential, can be implemented sequentially, and can also be implemented synchronously.
In this embodiment, the method for performing fracture control on the injection horizontal well 13 specifically includes:
injecting a floating diverting agent into the fracturing fluid;
in the crack-control fracturing process, the upward extension of the first upper crack 20 is controlled by the floating diverter.
When the upper seam control fracturing is carried out, the floating diverting agent can form a low-permeability artificial interlayer at the top of the first upper seam 20 to control the artificial fracture to extend upwards.
Similarly, the method for implementing the controlled-fracture fracturing on the production horizontal well 14 specifically comprises the following steps:
injecting a sinking diverting agent into the fracturing fluid;
in the controlled lower fracture fracturing process, the second lower fracture 22 is controlled to extend downward by the sinking diverting agent.
When the lower crack control fracturing is carried out, the sinking diverting agent can form a low-permeability artificial separation layer at the bottom of the second lower crack 22 to control the downward extension of the artificial crack.
Preferably, the first lower slits 21 and the second upper slits 23 are plural, and the first upper slits 20 and the second upper slits 23 are alternately arranged. And when performing controlled-top and controlled-bottom fractures, secondary microfractures 24 are also formed in the hot dry rock reservoir 100 between the injection horizontal well 13 and the production horizontal well 14.
Further, the injection-production step further comprises:
running a production string 15 and a lift pump 16 into the down-branch production well 12;
at the junction of the main well 10 and the lower branch production well 12, a packer 17 is provided to seal off the annular region, the packer 17 being fixedly sleeved outside the production string 15.
Further, the connection port of the upper branch injection well 11 and the main well 10 is positioned above the packer 17.
By setting the packer 17, the high temperature mixture in the lower branch production well 12 is prevented from flowing from the annular region into the upper branch injection well 11. Further, when low-temperature water is injected, the low-temperature water can be directly injected into the annular region, and due to the presence of the packer 17, the low-temperature water can only flow into the upper branch injection well 11 from the annular region. Therefore, only one production pipe column 15 is needed to be used for extracting the high-temperature mixture, and meanwhile, the low-temperature water is injected, so that the production cost is reduced.
In order to reduce the heat exchange between the high-temperature mixture and the outside during the lifting process, the production string 15 comprises an insulated oil pipe 18 arranged in the main well 10 and a common oil pipe 19 arranged in the lower branch production well 12, wherein the insulated oil pipe 18 and the common oil pipe 19 are fixedly connected and communicated.
As shown in fig. 2, in the first embodiment of the apparatus for simultaneous injection and production of a hot dry rock multilateral well of the present invention, the apparatus for injection and production comprises a main well 10, an upper multilateral injection well 11 communicating with the main well 10, and a lower multilateral production well 12 communicating with the main well 10, wherein an injection horizontal well 13 of the upper multilateral injection well 11 and a production horizontal well 14 of the lower multilateral production well 12 are both located in a hot dry rock reservoir 100, and the injection horizontal well 13 is located above the production horizontal well 14; the injection and production device also comprises a crack-controlling fracturing device which can be put into the injection horizontal well 13 for crack-controlling fracturing, a crack-controlling fracturing device which can be put into the production horizontal well 14 for crack-controlling fracturing, a production string 15 which can be put into the lower branch production well 12 and a lifting pump 16.
When the synchronous injection and production device for the branch dry hot rock wells is used, the upper branch injection well 11 and the lower branch production well 12 are respectively arranged in the dry hot rock reservoir 100, the upper branch injection well 11 and the lower branch production well 12 share the main well 10, and in the process of artificial fracturing, crack-controlling fracturing equipment and crack-controlling fracturing equipment are respectively used for performing crack-controlling fracturing and crack-controlling fracturing on the injection horizontal well 13 and the production horizontal well 14, so that artificial fractures can be formed between the injection horizontal well 13 and the production horizontal well 14, and large fractures above the injection horizontal well 13 and below the production horizontal well 14 can be avoided, and safety accidents are induced. When injection and production are carried out, low-temperature water can be injected into the upper branch injection well 11, the low-temperature water enters the horizontal production well from a crack between the injection horizontal well 13 and the production horizontal well 14 and exchanges heat with the hot dry rock reservoir 100, the low-temperature water absorbing heat of the hot dry rock reservoir 100 is changed into high-temperature water-vapor mixture and enters the horizontal production well, and finally the high-temperature water-vapor mixture is lifted out of the main well 10 by the lifting pump 16 for development and utilization. In this application, can be when injecting the low temperature water into the branch injection well 11 that makes progress, take out the high temperature mixture in the branch production well 12 down through lifting pump 16, realize synchronous cycle injection and adopt, improved the injection greatly and adopted efficiency, reduced development cost simultaneously.
In this embodiment, the injection and production device further comprises a packer 17 fixedly sleeved outside the production string 15 and used for sealing off the annular region, wherein the packer 17 is arranged at the joint of the main well 10 and the lower branch production well 12. Preferably, the connection port of the upper branch injection well 11 to the main well 10 is located above the packer 17.
By setting the packer 17, the high temperature mixture in the lower branch production well 12 is prevented from flowing from the annular region into the upper branch injection well 11. Further, when low-temperature water is injected, the low-temperature water can be directly injected into the annular region, and due to the presence of the packer 17, the low-temperature water can only flow into the upper branch injection well 11 from the annular region. Therefore, only one production pipe column 15 is needed to be used for extracting the high-temperature mixture, and meanwhile, the low-temperature water is injected, so that the production cost is reduced.
In order to reduce the heat exchange between the high-temperature mixture and the outside during the lifting process, the production string 15 comprises an insulated oil pipe 18 arranged in the main well 10 and a common oil pipe 19 arranged in the lower branch production well 12, wherein the insulated oil pipe 18 and the common oil pipe 19 are fixedly connected and communicated.
Preferably, to prevent the lift pump 16 and the packer 17 from being damaged in a high temperature environment, the lift pump 16 is a high temperature resistant lift pump 16, and the packer 17 is a high pressure and high temperature resistant retrievable packer 17.
In addition, in the present invention, unless otherwise expressly specified or limited, the terms "connected," "stacked," and the like are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A synchronous injection and production method for a branch well of dry hot rock in the same well is characterized by comprising the following steps:
drilling: drilling a main well, an upper branch injection well and a lower branch production well, wherein the upper branch injection well and the lower branch production well are communicated with the main well, an injection horizontal well of the upper branch injection well and a production horizontal well of the lower branch production well are positioned in a hot dry rock reservoir, and the injection horizontal well is positioned above the production horizontal well;
a fracturing step: carrying out crack-up control fracturing on the injection horizontal well, carrying out crack-down control fracturing on the production horizontal well, and forming an artificial crack between the injection horizontal well and the production horizontal well;
and (3) injection and production steps: injecting low-temperature water into the upper branch injection well, and pumping out the high-temperature mixture entering the lower branch production well through a lifting pump.
2. The hot dry rock branch well same-well synchronous injection and production method according to claim 1, wherein the fracturing step specifically comprises the following steps:
performing crack control fracturing on an injection horizontal well, and forming an asymmetric first upper crack and a first lower crack above and below the injection horizontal well respectively, wherein the height of the first upper crack is smaller than that of the first lower crack;
and performing fracture-controlled fracturing on the production horizontal well, and respectively forming an asymmetric second upper seam and a second lower seam above and below the production horizontal well, wherein the height of the second upper seam is greater than that of the second lower seam.
3. The hot dry rock branch well co-well synchronous injection and production method according to claim 2, wherein the method for implementing crack-controlling fracturing on the injection horizontal well specifically comprises the following steps:
injecting a floating diverting agent into the fracturing fluid;
in the upper seam control fracturing process, the upward extension of the first upper seam is controlled through the floating diverting agent;
the method for implementing the lower seam control fracturing on the production horizontal well specifically comprises the following steps:
injecting a sinking diverting agent into the fracturing fluid;
and in the lower seam control fracturing process, the second lower seam is controlled to extend downwards through the sinking diverting agent.
4. The hot dry rock lateral well co-well synchronous injection and production method according to claim 1, wherein the injection and production step further comprises:
lowering a production string and a lifting pump into the downward branch production well;
and a packer for plugging an annular area is arranged at the joint of the main well and the lower branch production well, and the packer is fixedly sleeved outside the production pipe column.
5. The hot dry rock branch well simultaneous injection and production method according to claim 4, wherein a connection port of the upper branch injection well and a main well is located above the packer.
6. The hot dry rock branch well co-well synchronous injection and production method according to claim 5, wherein the production string comprises an insulated tubing disposed in the main well and a plain tubing disposed in the lower branch production well, the insulated tubing and the plain tubing being fixedly connected and communicating.
7. The device is characterized by comprising a main well, an upper branch injection well communicated with the main well and a lower branch production well communicated with the main well, wherein an injection horizontal well of the upper branch injection well and a production horizontal well of the lower branch production well are both positioned in a hot dry rock reservoir, and the injection horizontal well is positioned above the production horizontal well;
the injection and production device further comprises upper seam control fracturing equipment which can be lowered into the injection horizontal well to perform upper seam control fracturing, lower seam control fracturing equipment which can be lowered into the production horizontal well to perform lower seam control fracturing, a production pipe column and a lifting pump which can be lowered into the lower branch production well.
8. The apparatus of claim 7, further comprising a packer fixedly secured to the outside of the production string for sealing off an annular region, wherein the packer is disposed at a junction of the main well and the lower branch production well.
9. The hot dry rock branch well co-well synchronous injection and production device according to claim 8, wherein the production string comprises an insulated tubing disposed in the main well and a plain tubing disposed in the lower branch production well, the insulated tubing and the plain tubing being fixedly connected and communicating.
10. The hot dry rock branch well co-well synchronous injection and production device according to claim 8, wherein the lift pump is a high temperature resistant lift pump, and the packer is a high pressure and high temperature resistant recoverable packer.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115234209A (en) * | 2022-07-25 | 2022-10-25 | 广州海洋地质调查局 | Synchronous exploitation method for same well of hot dry rock horizontal well and injection-production tubular column structure |
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