CN113846968A - Lateral drilling branch well heat taking device and method suitable for hot dry rock development - Google Patents
Lateral drilling branch well heat taking device and method suitable for hot dry rock development Download PDFInfo
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- CN113846968A CN113846968A CN202111186105.7A CN202111186105A CN113846968A CN 113846968 A CN113846968 A CN 113846968A CN 202111186105 A CN202111186105 A CN 202111186105A CN 113846968 A CN113846968 A CN 113846968A
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- 239000011435 rock Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005553 drilling Methods 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 88
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
- 238000005065 mining Methods 0.000 claims abstract description 24
- 238000000605 extraction Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 38
- 238000010276 construction Methods 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
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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
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Abstract
The invention discloses a sidetracking branch well heat taking device and a heat taking method thereof suitable for dry and hot rock development, which relate to the technical field of heat energy exploitation and comprise the following steps: the main well comprises a non-exploitation well section and a production well section, and the non-exploitation well section is positioned above the production well section; the technical casing is sleeved in the non-development well section; the upper end of the branch well is connected to the side wall of the technical casing, the branch pipe is communicated with the technical casing, and the lower end of the branch well is positioned on the dry-hot rock stratum; the production tubing is positioned in the technical casing, the lower end of the production tubing is connected with an impeller pump, and the impeller pump is connected with a power device; the mining tee joint is fixed at the upper end of the production tubing, and a liquid outlet of the mining tee joint is communicated with the production tubing; the injection tee joint is fixed on the ground surface and is provided with a liquid inlet, an upper injection through hole and a lower injection through hole; and the packer is arranged on the outer wall of the oil extraction pipe. The invention only needs to arrange one main well on the earth surface, and the construction cost is low.
Description
Technical Field
The invention relates to the technical field of thermal energy exploitation, in particular to a sidetracking branch well heat taking device and a heat taking method thereof, which are suitable for hot dry rock development.
Background
The dry hot rock is a new geothermal energy source, and is a high-temperature rock body which is generally at the temperature of more than 180 ℃, buried for thousands of meters and has no fluid or only a small amount of underground fluid (compact and waterproof) inside. The inventory is huge.
The dry-hot rock has the outstanding characteristics of large resource amount, zero pollution emission, good safety, no season restriction on heat energy continuity and the like, and is a practical, feasible and competitive clean energy. At present, the method of establishing EGS engineering is generally adopted to exploit dry and hot rock resources, and generally a straight well is drilled firstly to serve as an injection well, then the volume of a seam network is enlarged by adopting hydraulic fracturing, then one or more wells are drilled to serve as production wells, cold water is injected from the injection wells, and hot water is exploited from the production wells, so that deep heat energy utilization is realized.
However, the above method requires additional drilling of several production wells on the basis of the injection well, which increases construction costs and also increases damage to surface vegetation.
Therefore, in the field of heat extraction from hot dry rock, a new heat extraction device and method thereof are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a sidetracking branch well heat taking device and a heat taking method thereof, which are suitable for hot dry rock development and are used for solving the technical problems in the prior art, only one main well needs to be built on the ground surface, and no additional production well needs to be arranged, so that the construction cost is effectively reduced.
In order to achieve the purpose, the invention provides the following scheme:
the invention discloses a sidetracking branch well heat taking device suitable for development of hot dry rock, which comprises:
the main well comprises a non-exploitation well section and a production well section, the non-exploitation well section is positioned above the production well section, and the lower end of the production well section is positioned in the dry heat rock stratum;
a technical casing sleeved within the non-development well section;
the upper end of the branch well is connected to the side wall of the technical casing, the branch pipe is communicated with the technical casing, and the lower end of the branch well is positioned on the dry-hot rock stratum;
the oil production pipe is positioned in the technical casing, a first annular gap is formed between the oil production pipe and the technical casing, the lower end of the oil production pipe is connected with an impeller pump, and the impeller pump is connected with a power device;
the mining tee joint is fixed at the upper end of the production oil pipe, and a liquid outlet of the mining tee joint is communicated with the production oil pipe;
the injection tee joint is fixed on the ground surface and provided with a liquid inlet, an upper-end injection through hole and a lower-end injection through hole, the production tubing sequentially penetrates through the upper-end injection through hole and the lower-end injection through hole, and the lower-end injection through hole is communicated with the technical sleeve;
and the packer is arranged on the outer wall of the production oil pipe and is positioned below the upper end of the branch well.
Preferably, a screen is provided in the production wellbore section.
Preferably, the power device comprises a motor and a long shaft, an output shaft of the motor is fixed at the upper end of the long shaft, the lower end of the long shaft is fixed at an input shaft of the impeller pump, and a second annular gap is formed between the long shaft and the production oil pipe.
Preferably, the mining tee joint further comprises an upper end mining through hole and a lower end mining through hole, and the long shaft sequentially penetrates through the upper end mining through hole and the lower end mining through hole.
Preferably, the outer side of the upper end of the main well is sleeved with a surface casing.
Preferably, the main well is a vertical well.
Preferably, the branch well is plural.
The invention also discloses a heat taking method of the sidetracking branch well heat taking device suitable for dry hot rock development, which comprises the following steps:
s1: firstly, drilling a main well, and putting a technical casing in a non-development well section at the upper part;
s2: performing hydraulic fracturing on a production well section to form an artificial fracturing network outside a main well to be used as a later-stage circulating heat extraction channel;
s3: a branch well is drilled on the side wall of the technical casing pipe by windowing, and the branch well needs to drill through a fracturing network formed by hydraulic fracturing;
s4: installing a production tubing, a packer, a production tee joint, an injection tee joint, an impeller pump and a power device;
s5: injecting the cryogenic fluid into a first annular gap between the technical casing and the production tubing through an injection tee at the ground surface, wherein the cryogenic fluid descends along the first annular gap;
s6: when the cryogenic fluid encounters the obstruction of the packer, the cryogenic fluid will flow from the upper end of the lateral to the lower end of the lateral;
s7: when the low-temperature fluid flows out of the branch well, the low-temperature fluid enters the fracturing network, is continuously heated in the circulating process of the fracturing network, is changed into high-temperature fluid and then flows to the main well;
s8: the high-temperature fluid entering the production well section enters the production tubing under the suction action of the impeller pump, is conveyed to the production tee joint on the ground surface, and is collected.
Compared with the prior art, the invention has the following technical effects:
1. according to the invention, only one well needs to be drilled on the ground surface, so that the occupied area can be greatly reduced, the damage to the vegetation on the ground surface is reduced, and the well site construction cost is saved;
2. furthermore, compared with the arrangement of a plurality of production wells, the method does not need to repeatedly drill the upper non-development well section, can greatly reduce the drilling workload and well forming materials, and saves the drilling cost;
3. the invention can sidetrack one or more branch wells, greatly improves the heat exchange volume, and has more sidetrack branch wells and more obvious economic benefit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sidetrack branch well heat extraction device for hot dry rock development according to an embodiment of the invention.
In the figure: 1-a motor; 2-exploiting the tee joint; 3-injection of a tee; 4-surface casing; 5-technical sleeve; 6-cement; 7-long axis; 8-producing the oil production pipe; 9-a packer; 10-a vane pump; 11-a production interval; 12-fracturing the fracture network; 13-Branch well.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a sidetracking branch well heat taking device and a heat taking method thereof, which are suitable for hot dry rock development and are used for solving the technical problems in the prior art, only one main well needs to be built on the ground surface, and no additional production well needs to be arranged, so that the construction cost is effectively reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present embodiment provides a sidetracking branch well heat extraction device suitable for hot dry rock development, which includes:
the main well comprises a non-exploitation well section and a production well section 11, the non-exploitation well section is positioned above the production well section 11, the upper end of the non-exploitation well section is positioned at the earth surface, and the lower end of the production well section 11 is positioned in the dry heat rock stratum;
the technical casing 5 is sleeved in the non-exploitation well section, the outer wall of the technical casing 5 is fixed on the inner wall of the non-exploitation well section, and the technical casing 5 is not required to be arranged on the production well section 11;
the branch well 13 is obliquely arranged, the inclination angle is set according to the actual situation, the upper end of the branch well 13 is connected to the side wall of the technical casing 5, the branch well 13 penetrates through the main well, the branch pipe is communicated with the technical casing 5, and the lower end of the branch well 13 is positioned at the dry-hot rock stratum;
the production pipe 8 is positioned in the technical casing 5, a first annular gap is formed between the production pipe 8 and the technical casing 5, the lower end of the production pipe 8 is connected with an impeller pump 10, the impeller pump 10 is connected with a power device, and the power device drives the impeller pump 10 to rotate;
the production tee 2 is fixed at the upper end of the production tubing 8, a liquid outlet (a left opening in the drawing) of the production tee 2 is communicated with the production tubing 8 through an inner cavity of the production tee 2, and liquid in the production tubing 8 can finally flow out of the liquid outlet;
the injection tee joint 3 is fixed on the ground surface, the mining tee joint 2 is positioned above the injection tee joint 3, the injection tee joint 3 is provided with a liquid inlet, an upper end injection through hole and a lower end injection through hole (which respectively correspond to a right opening, an upper opening and a lower opening in the drawing), the production oil pipe 8 sequentially penetrates through the upper end injection through hole and the lower end injection through hole, the lower end injection through hole is communicated with the technical sleeve 5, namely the liquid inlet is communicated with the first annular gap but is not communicated with the production oil pipe 8;
a packer 9, which is prior art, the packer 9 being arranged on the outer wall of the production tubing 8 for plugging a first annular gap between the production tubing 8 and the non-productive wellbore section, the packer 9 being located below the upper end of the branch wellbore 13.
When the fracturing device is used, firstly, the production well section 11 of the main well is utilized to perform hydraulic fracturing, so that the fracturing fracture network 12 is formed around the production well section 11. Then, the cryogenic fluid is injected into the first annular gap between the technical casing 5 and the production tubing 8 by a circulating pump at the surface through the injection tee 3, and descends along the first annular gap. Because of the action of the packer 9, the low-temperature fluid cannot flow downwards continuously when flowing to the packer 9, and only can flow back to the branch well 13, the low-temperature fluid flowing out of the branch well 13 enters the fracturing network 12, and the low-temperature fluid is heated continuously during the circulation process of the fracturing network 12, so that the low-temperature fluid is converted into high-temperature fluid. Then the high-temperature fluid enters the production well section 11 again, enters the production tubing 8 under the pumping action of the impeller pump 10 and then is sent to the production tee joint 2 on the ground surface, thereby realizing the purpose that the formation heat is produced to the ground surface for use.
In this embodiment, a sieve tube is arranged in the production well section 11, and the purpose of the sieve tube is to filter out particles and impurities in the high-temperature fluid and prevent sand and soil from entering the production string 8 together with the high-temperature fluid. One skilled in the art may choose not to have a screen and any casing.
In this embodiment, the power device includes a motor 1 and a long shaft 7, the motor 1 is disposed on the ground surface, an output shaft of the motor 1 is fixed to an upper end of the long shaft 7, a lower end of the long shaft 7 is fixed to an input shaft (pump shaft) of the vane pump 10, and a second annular gap is formed between the long shaft 7 and the production tubing 8. When the high-temperature fluid pumping unit is used, the long shaft 7 can be driven to rotate only by starting the motor 1 to rotate, and the long shaft 7 can drive the impeller of the impeller pump 10 to rotate, so that high-temperature fluid below the production oil pipe 8 is pumped into the production oil pipe 8 and is continuously conveyed upwards.
In this embodiment, the mining tee 2 further includes an upper mining through-hole and a lower mining through-hole (corresponding to the upper and lower holes in the drawing, respectively), and the long shaft 7 sequentially passes through the upper mining through-hole and the lower mining through-hole and is rotatably connected with the upper mining through-hole and the lower mining through-hole.
In this embodiment, the upper end outside cover of main shaft is equipped with surface casing 4, and the outside of surface casing 4 is cement 6, and surface casing 4 only sets up the upper portion of non-development well section, plays the supporting role can.
In this embodiment, the main well is a vertical well, and those skilled in the art can set it as a directional well as required.
In this embodiment, the number of the branch wells 13 may be one or more, and the plurality of branch wells 13 can greatly increase the heat exchange volume. Therefore, the more the lateral branch wells 13 are drilled, the more obvious the economic benefit is.
The embodiment also provides a heat extraction method of the sidetracking branch well 13 heat extraction device suitable for hot dry rock development, which comprises the following steps:
s1: firstly, drilling a main well which is generally a straight well or a directional well, running a technical casing 5 and a surface casing 4 into an upper non-development well section, and optionally running a screen pipe into a production well section 11 according to needs;
s2: performing hydraulic fracturing on the production well section 11 to form an artificial fracturing network 12 outside the main well as a later-stage circulating heat extraction channel;
s3: a branch well 13 is drilled on the side wall of the technical casing 5 by windowing, and the branch well 13 needs to drill through a fracturing network 12 formed by hydraulic fracturing;
s4: installing a production tubing 8, a packer 9, a production tee joint 2, an injection tee joint 3, an impeller pump 10 and a power device (a motor 1 and a long shaft 7), wherein the power of the motor 1 can be transmitted to the impeller pump 10 through the long shaft 7 and is used for pumping high-temperature fluid in the well;
s5: the cryogenic fluid is injected into a first annular gap between the technical casing 5 and the production tubing 8 through the injection tee 3 at the ground surface by using a circulating pump, and the cryogenic fluid descends along the first annular gap;
s6: when the cryogenic fluid encounters the obstruction of packer 9, the cryogenic fluid will flow from the upper end of lateral 13 to the lower end of lateral 13;
s7: when the low-temperature fluid flows out of the branch well 13, the low-temperature fluid enters the fracturing network 12, is continuously heated in the circulation process of the fracturing network 12, is changed into high-temperature fluid and then flows to the main well;
s8: the high-temperature fluid entering the production well section 11 enters the production tubing 8 under the pumping action of the impeller pump 10, is conveyed to the production tee 2 on the surface and is collected.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A sidetracking lateral branch well heat extraction device suitable for hot dry rock development is characterized by comprising:
the main well comprises a non-exploitation well section and a production well section, the non-exploitation well section is positioned above the production well section, and the lower end of the production well section is positioned in the dry heat rock stratum;
a technical casing sleeved within the non-development well section;
the upper end of the branch well is connected to the side wall of the technical casing, the branch pipe is communicated with the technical casing, and the lower end of the branch well is positioned on the dry-hot rock stratum;
the oil production pipe is positioned in the technical casing, a first annular gap is formed between the oil production pipe and the technical casing, the lower end of the oil production pipe is connected with an impeller pump, and the impeller pump is connected with a power device;
the mining tee joint is fixed at the upper end of the production oil pipe, and a liquid outlet of the mining tee joint is communicated with the production oil pipe;
the injection tee joint is fixed on the ground surface and provided with a liquid inlet, an upper-end injection through hole and a lower-end injection through hole, the production tubing sequentially penetrates through the upper-end injection through hole and the lower-end injection through hole, and the lower-end injection through hole is communicated with the technical sleeve;
and the packer is arranged on the outer wall of the production oil pipe and is positioned below the upper end of the branch well.
2. The sidetrack lateral well heat extraction device suitable for hot dry rock development of claim 1, wherein: and a sieve tube is arranged in the production well section.
3. The sidetrack lateral well heat extraction device suitable for hot dry rock development of claim 1, wherein: the power device comprises a motor and a long shaft, an output shaft of the motor is fixed at the upper end of the long shaft, the lower end of the long shaft is fixed at an input shaft of the impeller pump, and a second annular gap is formed between the long shaft and the oil production pipe.
4. The sidetrack lateral well heat extraction device suitable for hot dry rock development of claim 3, wherein: the mining tee joint further comprises an upper end mining through hole and a lower end mining through hole, and the long shaft sequentially penetrates through the upper end mining through hole and the lower end mining through hole.
5. The sidetrack lateral well heat extraction device suitable for hot dry rock development of claim 1, wherein: and a surface casing is sleeved on the outer side of the upper end of the main well.
6. The sidetrack lateral well heat extraction device suitable for hot dry rock development of claim 1, wherein: the main well is a vertical well.
7. The sidetrack lateral well heat extraction device suitable for hot dry rock development of claim 1, wherein: the branch well is multiple.
8. A heat extraction method of the sidetrack branch well heat extraction device suitable for the development of the hot dry rock based on any one of claims 1-7, characterized by comprising the following steps:
s1: firstly, drilling a main well, and putting a technical casing in a non-development well section at the upper part;
s2: performing hydraulic fracturing on a production well section to form an artificial fracturing network outside a main well to be used as a later-stage circulating heat extraction channel;
s3: a branch well is drilled on the side wall of the technical casing pipe by windowing, and the branch well needs to drill through a fracturing network formed by hydraulic fracturing;
s4: installing a production tubing, a packer, a production tee joint, an injection tee joint, an impeller pump and a power device;
s5: injecting the cryogenic fluid into a first annular gap between the technical casing and the production tubing through an injection tee at the ground surface, wherein the cryogenic fluid descends along the first annular gap;
s6: when the cryogenic fluid encounters the obstruction of the packer, the cryogenic fluid will flow from the upper end of the lateral to the lower end of the lateral;
s7: when the low-temperature fluid flows out of the branch well, the low-temperature fluid enters the fracturing network, is continuously heated in the circulating process of the fracturing network, is changed into high-temperature fluid and then flows to the main well;
s8: the high-temperature fluid entering the production well section enters the production tubing under the suction action of the impeller pump, is conveyed to the production tee joint on the ground surface, and is collected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111186105.7A CN113846968A (en) | 2021-10-12 | 2021-10-12 | Lateral drilling branch well heat taking device and method suitable for hot dry rock development |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111186105.7A CN113846968A (en) | 2021-10-12 | 2021-10-12 | Lateral drilling branch well heat taking device and method suitable for hot dry rock development |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114961668B (en) * | 2022-05-18 | 2023-12-29 | 太原理工大学 | Fracture type dry hot rock reservoir double inclined shaft sectional regulation and control reinforced heat collection method |
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Application publication date: 20211228 |
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