CN117166981A - Well completion device and method for efficiently developing geothermal system of dry-hot rock - Google Patents
Well completion device and method for efficiently developing geothermal system of dry-hot rock Download PDFInfo
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Abstract
The invention provides a well completion device and a well completion method for efficiently developing a geothermal system of hot dry rock, and belongs to the technical field of hot dry rock development. The completion device includes a vertical main wellbore casing; a plurality of first-layer branch wellbore casings and second-layer branch wellbore casings which are respectively oriented in different directions are communicated with the vertical main wellbore casing, and the first-layer branch wellbore casing is positioned above the second-layer branch wellbore casing; a central tubing string is arranged in the vertical main well casing, a packer is connected to the central tubing string, and the packer seals an oil casing annulus formed by the vertical main well casing and the central tubing string. The invention can form a huge heat exchange system, increase the heat exchange contact area and improve the heat exchange efficiency; meanwhile, a jet cavitation device is connected and arranged in the central tubing string, so that water flow generates pulsation, the problem of constant water flow scaling is solved, and the stable operation time of the whole system is prolonged.
Description
Technical Field
The invention belongs to the technical field of dry-hot rock development, and particularly relates to a well completion device and method for a geothermal system for efficiently developing dry-hot rock, which are suitable for the development and utilization of dry-hot rock resources.
Background
Compared with renewable energy sources such as solar energy, wind energy and the like, the geothermal energy has the advantages of stability (not influenced by seasons and day-and-night changes), high utilization rate (the geothermal power generation utilization efficiency can exceed 73 percent and is 5.2 times of solar photovoltaic power generation and 3.5 times of wind power generation), safety, low operation cost, comprehensive utilization (power generation, heating, bathing, cultivation, snow melting, urban hot water supply) and the like, and very important geothermal development has an emission reduction function.
The geothermal dry-hot rock is considered as a green energy source, generally refers to granite rock bodies with buried depths of 3000-5000m and temperatures of more than 180 ℃, and belongs to a low-carbon clean energy source. The geothermal energy of the dry thermal rock (also called as an enhanced geothermal system) has the characteristics of large energy, wide distribution, extremely high utilization rate, good safety, no pollution, no need of tail water recharging, stable and continuous heat energy, strong power generation controllability, good disaster reduction and emission reduction effects and the like. Dry rock power generation tests and commercial operations have been conducted in the united states, australia, united kingdom, germany, france, japan, swiss, sweden, etc. to date.
Dry hot rock refers to a rock mass of high temperature underground but low porosity and permeability lacking fluid, and the heat stored in the dry hot rock needs to be manually fractured to form an enhanced geothermal system for exploitation.
According to the technical means at the present stage, the geothermal resource of the dry hot rock is a hot rock mass which has shallow burial depth, higher temperature and development economic value. The energy stored in the dry hot rock (3-10 km deep) in the crust is conservatively estimated to be 30 times of the energy stored in all petroleum, natural gas and coal worldwide. According to the report of the university of hemp and province institute of technology in 2006, the storage capacity of dry hot rock resources with the depth of 3500-7500 m and 2% can reach 260000 and EJ, which is 2600 times of the total energy consumption in the whole year of 2005 in the United states, and the method has great development potential. The enhanced geothermal system is provided on the basis of the technology of the dry thermal rock, the definition of the United states energy department is that a method of manually forming geothermal reservoirs is adopted, the development and the utilization of the dry thermal rock of the artificial geothermal system for economically extracting deep heat energy from low-permeability rock are mainly realized by constructing a single well or injecting cold water into the well (an injection well and a production well), absorbing heat, converting the heat into high temperature water or steam, lifting the water to the ground surface for utilization, and reinjecting the water after the heat is extracted, so that the purpose of 'taking heat without taking water' without interference conversion is achieved. However, the areas of the methods contacted with the dry hot rock are smaller, the heat absorption range is small, the heat transfer is limited, and the technology in the present stage ensures that the collected heat is small, and the heat production efficiency is low.
Chinese patent publication CN106640028A discloses a well completion method of a two-well communication circulation enhanced geothermal system, wherein the U-shaped well adopts a method of thermal insulation sleeve well completion to extract heat of dry hot rock, and the method improves heat exchange compared with the method of extracting dry hot rock by a straight well, but the path through which exchange water passes and the heat exchange area are smaller, which is not beneficial to improving development power.
Therefore, there is a need to develop a well completion and method for efficiently developing geothermal systems for hot dry rock, so as to improve the heat exchange efficiency of hot dry rock, reduce the development cost and solve the technical limitations.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a well completion device and a well completion method for efficiently developing a geothermal system of dry hot rock, which can form a huge heat exchange system, increase heat exchange contact area and improve heat exchange efficiency; meanwhile, by arranging the jet cavitation device in the central oil pipe, the water flow generates pulsation, the problem of constant water flow scaling is eliminated, and the stable operation time of the whole system is prolonged.
The invention is realized by the following technical scheme:
in a first aspect of the invention, there is provided a well completion apparatus for efficient development of a dry hot rock geothermal system, the well completion apparatus comprising a vertical main wellbore casing;
the vertical main well bore casing is communicated with a plurality of first layers of branch well bore casings and a plurality of second layers of branch well bore casings which are respectively oriented in different directions, and the first layers of branch well bore casings are positioned above the second layers of branch well bore casings;
a central tubing string is arranged in the vertical main well casing, a packer is connected to the central tubing string, and the packer seals an oil casing annulus formed by the vertical main well casing and the central tubing string.
The invention further improves that:
the packer is positioned between the first layer of branch wellbore casing and the second layer of branch wellbore casing.
The invention further improves that:
the bottom of the central tubing string is matched with the bottom of the vertical main well bore casing, and a plurality of through holes are formed in the side wall of the central tubing string at positions corresponding to the second layer of branch well bore casing.
The invention further improves that:
and a jet cavitation device is connected in the central tubing string and is positioned above the second layer of branch wellbore casing.
The invention further improves that:
and a first layer of branch wellbore tubing string is arranged in the first layer of branch wellbore casing.
The invention further improves that:
a first layer of branch wellbore packer is arranged in an oil sleeve annulus formed by the first layer of branch wellbore casing and the first layer of branch wellbore tubing string, and the first layer of branch wellbore packer is positioned at one end, close to the vertical main wellbore casing, in the oil sleeve annulus;
and a centralizer is arranged at the other end in an oil sleeve annulus formed by the first layer of branch wellbore casing and the first layer of branch wellbore tubing string.
The invention further improves that:
and a second layer of branch wellbore tubing string is arranged in the second layer of branch wellbore casing.
The invention further improves that:
a second layer of branch wellbore packer is arranged in an oil sleeve annulus formed by the second layer of branch wellbore casing and the second layer of branch wellbore tubing string, and the second layer of branch wellbore packer is positioned at one end, close to the vertical main wellbore casing, in the oil sleeve annulus;
and a centralizer is arranged at the other end in an oil sleeve annulus formed by the second layer of branch wellbore casing and the second layer of branch wellbore tubing string.
The invention further improves that:
the vertical main well casing comprises a production casing and a surface casing sleeved on the upper portion of the production casing, and a bottom hole support is arranged at the bottom of the production casing.
In a second aspect of the present invention, there is provided a method of efficiently developing a completion of a geothermal system for hot dry rock, the completion method comprising the steps of:
first step, main wellbore drilling construction
Firstly, performing first-drilling well down-hole surface casing, and then performing second-drilling well down-hole production casing;
second step, drilling construction of first layer branch well bore
Drilling a plurality of first layers of branch wellbores in different directions, putting into a first layer of branch wellbore casing after drilling, then performing staged fracturing on the first layer of branch wellbores, and putting into a first layer of branch wellbore tubing string, a centralizer and a first layer of branch wellbore packer after fracturing is finished;
third step, drilling construction of second layer branch well bore
Drilling a plurality of second-layer branch wellbores at the designed position below the first-layer branch wellbores, putting into a second-layer branch wellbore casing after drilling, then performing staged fracturing of the second-layer branch wellbores, and putting into a second-layer branch wellbore tubing string, a centralizer and a second-layer branch wellbore packer after fracturing;
fourthly, a bottom support is arranged at the bottom of the production casing, a central tubing string is arranged in the production casing, and the central tubing string is matched with the bottom of the production casing;
fifthly, setting a packer in an oil sleeve annulus formed by the production sleeve and the central tubing string, and enabling the packer to be positioned between the first layer of branch wellbore sleeve and the second layer of branch wellbore sleeve;
and sixthly, connecting a jet cavitation device in the central tubing string, so that the jet cavitation device is positioned above the second layer of branch wellbore casing.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a well completion device and a well completion method for a geothermal system for efficiently developing hot dry rock, which can realize the efficient development and utilization of hot dry rock resources, realize the sufficient and large-area heat exchange of injected water (liquid) and hot dry rock, realize the temperature and heat value of produced water (liquid) to meet the efficient development requirements, realize the same well to meet the injection and production requirements, realize the intensification of hot dry rock development, improve the development efficiency and benefit and prolong the service life of a hot dry rock well.
According to the invention, the jet cavitation device is arranged in the central oil pipe, so that the water flow generates pulsation, the problem of constant water flow scaling is solved, and the crack can be promoted to keep a good crack width, so that the flow conductivity is high, and the stable operation time of the whole system is prolonged.
According to the invention, the branch well oil pipe is put into the branch well, so that the short circuit of injected water (liquid) is avoided, the development efficiency and benefit are improved, and the service life of the dry-hot rock well is prolonged.
The invention has simple principle and high reliability, improves the development effect of the dry-hot rock, and is beneficial to carbon reduction and environmental protection actions.
Drawings
FIG. 1 is a schematic diagram of a well completion device of a geothermal system for efficient development of dry-hot rock in accordance with the present invention;
FIG. 2 is a schematic diagram of a well completion well bore configuration for a high efficiency development dry hot rock geothermal system;
wherein: a1 and A2 are branch wellbores of a first layer, and B1 and B2 are branch wellbores of a second layer;
FIG. 3 is a schematic illustration of the construction process of the A1, A2 branch wellbores in a high-efficiency developed dry-hot rock geothermal system completion;
FIG. 4 is a schematic diagram of the construction process of branch B1, B2 wellbores in a well completion of a high-efficiency development dry-hot rock geothermal system.
Wherein: 1. surface casing, 2, production casing, 3, central tubing string, 4, jet cavitation device, 5, packer, 6, first layer branch wellbore packer, 7, first layer branch wellbore tubing string, 8, centralizer, 9, bottom hole support, 10, first layer branch wellbore casing, 11, second layer branch wellbore casing, 12, second layer branch wellbore tubing string, 13, second layer branch wellbore packer.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
according to the invention, a well completion device and a well completion method of a high-efficiency development dry-hot rock geothermal system are adopted, in the dry-hot rock development process, a well completion pipe column is respectively put into a well completion hole and a main well hole through well drilling and well fracturing communication of a branch well, so that a novel enhanced geothermal development system is built, a huge heat exchange system for dry-hot rock injection circulation is realized, injected water (liquid) circularly flows for a plurality of times, full heat exchange is carried out, the temperature of produced water (liquid) is increased, and the development benefit and the service life of the dry-hot rock development well are improved.
The invention utilizes the principle of reverse gravity flow to exchange the full contact heat exchange of the injection fluid and the geothermal rock mass, and the temperature of the injection fluid is increased as much as possible.
The method adopts a central oil pipe injection and annular extraction mode, can be relatively suitable for a high-pressure injection mode, and can also meet the requirement of large-displacement injection, so that the requirement of high-power generation can be met, further, the income of projects is improved, the overall cost of the projects is reduced, and the investment recovery rate is improved.
The invention provides a completion device for efficiently developing a geothermal system of dry-hot rock, which comprises the following embodiments:
[ example 1 ]
As shown in fig. 1, the completion apparatus includes a vertical main wellbore casing;
the vertical main well bore casing is communicated with a plurality of first layers of branch well bore casings 10 and second layers of branch well bore casings 11 which are oriented in different directions, and the first layers of branch well bore casings 10 are positioned above the second layers of branch well bore casings 11; in the well completion process, staged fracturing is carried out on the first layer branch well bore and the second layer branch well bore respectively to form a modified crack, so that the first layer branch well bore and the second layer branch well bore are effectively communicated through the modified crack, and a seepage channel is provided for water (liquid) injection;
a central tubing string 3 is arranged in the vertical main well casing, the bottom of the central tubing string 3 is matched with the bottom of the vertical main well casing, a plurality of through holes are formed in the side wall of the central tubing string 3 and at the positions corresponding to the second layer of branch well casing 11, so that after injected water (liquid) is injected through the central tubing, the injected water (liquid) enters the second layer of branch well casing through the through holes in the side wall of the central tubing string 3, permeates into the first layer of branch well casing through the modified cracks, and an oil sleeve annulus formed by the vertical main well casing and the central tubing string 3 is extracted from a wellhead;
the packer 5 is arranged in an oil sleeve annulus formed by the vertical main well bore casing and the central tubing string 3 for sealing, and the packer 5 is positioned between the first layer of branch well bore casing 10 and the second layer of branch well bore casing 11, so that injected water (liquid) injected through the central tubing string 3 is prevented from directly flowing out through the oil sleeve annulus.
[ example 2 ]
The vertical main well casing comprises a production casing 2 and a surface casing 1 sleeved on the upper part of the production casing 2, a bottom support 9 is arranged at the bottom of the production casing 2, and the bottom support 9 can ensure the support, centering and depth positioning of the vertical main well casing. The production sleeve 2 adopts a heat insulation sleeve, so that produced water (liquid) is kept warm, and heat loss is prevented.
The jet cavitation device 4 is connected in the central tubing string 3, and the jet cavitation device 4 is positioned above the second layer of branch wellbore casing 11, so that water flow can be pulsed, the problem of constant water flow scaling is solved, and cracks can be promoted to keep good seam width, thereby having high diversion capability, and the stable running time of the whole system is prolonged.
The jet cavitation device is a product of the prior art and is not described in detail herein.
The first layer of branch wellbore casing 10 and the second layer of branch wellbore casing 11 may be provided in plural in different directions, and the first layer of branch wellbore casing 10 and the second layer of branch wellbore casing 11 each correspond, for example, the upper layers are A1 and A2 each being the first layer of branch wellbore casing, the lower layers are B1 and B2 each being the second layer of branch wellbore casing, A1 and B1 each corresponding, and A2 and B2 each corresponding.
[ example 3 ]
The second layer branch well hole casing 11 is internally provided with a second layer branch well hole tubing string 12, the bottom of the second layer branch well hole tubing string 12 is kept at a certain distance (or clearance) from the bottom of the second layer branch well hole casing 11, an oil sleeve annulus formed by the second layer branch well hole casing 11 and the second layer branch well hole tubing string 12 is internally provided with a second layer branch well hole packer 13, and the second layer branch well hole packer 13 is positioned at one end, close to the vertical main well hole casing, in the oil sleeve annulus, so that injected water (liquid) can enter from the second layer branch well hole tubing string 12, enter into a crack through the oil sleeve annulus, and flow into the first layer branch well hole casing 10 through seepage.
The other end in the oil sleeve annulus formed by the second layer of branch wellbore casing 11 and the second layer of branch wellbore tubing string 12 is provided with a centralizer 8, which performs centralizing and supporting functions on the second layer of branch wellbore tubing string 12.
The first layer branch well bore casing 10 is internally provided with a first layer branch well bore tubing string 7, the bottom of the first layer branch well bore tubing string 7 is kept at a certain distance (or clearance) from the bottom of the first layer branch well bore casing 10, the oil sleeve annulus formed by the first layer branch well bore casing 10 and the first layer branch well bore tubing string 7 is internally provided with a first layer branch well bore packer 6, and the first layer branch well bore packer 6 is positioned at one end, close to the vertical main well bore casing, in the oil sleeve annulus, so that injected water (liquid) flowing into the first layer branch well bore casing 10 through seepage flows into the first layer branch well bore tubing string 7 through the oil sleeve annulus formed by the first layer branch well bore casing 10 and the first layer branch well bore tubing string 7, and then flows into the oil sleeve annulus formed by the vertical main well bore casing and the central tubing string 3 to produce a wellhead.
The other end in the oil sleeve annulus formed by the first layer of branch wellbore casing 10 and the first layer of branch wellbore tubing string 7 is provided with a centralizer 8, which performs centralizing and supporting functions on the first layer of branch wellbore tubing string 7.
The device can improve the heat exchange volume and the heat exchange capacity of the enhanced geothermal system, improve the heat exchange efficiency and the heat exchange power, improve the development efficiency and the development effect of the dry hot rock, prolong the service life of the dry hot rock well and improve the overall development benefit.
The invention also provides a well completion method for efficiently developing the geothermal system of the dry-hot rock, which comprises the following steps:
[ example 4 ]
The well completion method specifically comprises the following steps:
first step, determining the well position of the dry-hot rock
The method comprises the following steps: collecting geophysical prospecting seismic data, geothermal data and the like, selecting favorable blocks in favorable areas, selecting coordinate positions of a developed dry-hot rock well, and determining a developed favorable layer section.
And secondly, collecting various data, carrying out the design of a drilling and completion scheme and engineering design of the dry-hot rock branch well, determining the well body structure and the well track of the branch well, determining the fracturing construction process parameters and the well completion pipe string structure parameters, and providing index requirements for engineering control, wherein the well body structure is shown in figure 2.
The length of the branch well bore is reasonably determined according to the ground power generation installed power calculation optimization result and the dry hot rock stratum matching result, and is generally 60m-3000m, preferably 80m-1600 m. The distance between the first and second lateral boreholes in the vertical direction is determined by the thickness of the dry heat formation, and is typically 50m to 250m, preferably 110m to 180m.
Third step, vertical main well drilling construction
The specific operation is as follows: firstly, a first drilling is carried out, the surface casing 1 is put into the well, the diameter of the surface casing 1 is 244.5mm, then, a second drilling is carried out, the production casing 2 is put into the well, the diameter of the production casing 2 is 177.5mm, and the production casing 2 is a heat insulation casing according to requirements.
Fourth, drilling construction of first layer branch well bore
The specific operation is as follows: as shown in fig. 3, the construction of the first layer branch wellbores A1 and A2 is performed, the diameter of the wellbore is 127mm, the length of the first layer branch wellbore is 300m, after the first layer branch wellbore is drilled, the first layer branch wellbore casing 10 is put into the first layer branch wellbore, the staged fracturing strings A1 and A2 are subjected to staged fracturing, the spacing between the stages is 60m, the staged fracturing strings can be selected to perform the construction, the staged fracturing strings can be dragged by double packers, the staged fracturing stages and the control parameters of each stage are required to determine the dry thermal rock volume required to be reformed according to the heat exchange area required by the dry thermal rock development power calculation, the simulation calculation is repeated for a plurality of times, the optimization result parameters are selected, after the fracturing is finished, the first layer branch wellbore tubing string 7, the centralizer 8 and the first layer branch wellbore 6 are put into, the first layer branch wellbore tubing string 7 adopts soluble materials, the dissolution time is determined according to the construction time of the second layer branch wellbores B1 and B2, and sufficient safety coefficients are reserved to prevent the branch wellbores A1 and A2 from being polluted during the branch construction.
Fifth step, drilling construction of second layer branch well bore
As shown in fig. 4, construction of the second layer branch wellbores B1 and B2 is performed, the length of the second layer branch wellbores is 330m, the vertical distance from the A1 and A2 wellbores is 70m, the diameter of the wellbore is 114mm, after drilling, the second layer branch wellbore casing 11 is put into the second layer branch wellbore, staged fracturing of the second layer branch wellbores B1 and B2 is performed, the staged fracturing string can select a multi-stage hydraulic jet string to perform construction, dual-packer dragging staged fracturing string construction can also be selected, the number of staged fracturing stages and each stage of control parameters are required to determine the dry thermal rock volume to be reformed according to the heat exchange area required by the dry thermal rock development power calculation, simulation calculation is repeated for a plurality of times, optimized result parameters are selected, after fracturing is finished, the second layer branch wellbore tubing string 12, the completion centralizer 8 and the second layer branch packer 13 are put into the second layer branch wellbore tubing string 12 to be plugged by adopting soluble materials, the dissolution time is determined according to the vertical main wellbore construction time, and a sufficient safety coefficient is reserved to prevent pollution to the second layer branch wellbores B1 and B2 during the vertical main wellbore construction.
And respectively carrying out staged fracturing on the first layer branch wellbores and the second layer branch wellbores to form modified cracks, so that the first layer branch wellbores and the second layer branch wellbores are effectively communicated through the modified cracks, and a seepage channel is provided for water (liquid) injection.
And step six, a bottom hole support 9 is arranged below the vertical main well hole to ensure the support, centering and depth positioning of the vertical main well hole casing.
Seventh, a central tubing string 3 is put into the production casing 2, a packer 5 is set in an oil sleeve annulus formed by the production casing 2 and the central tubing string 3, the packer 5 is positioned between the first layer branch well bores and the second layer branch well bores, the packer 5 seals the first layer branch well bores A1 and A2 and the second layer branch well bores B1 and B2, a jet cavitation device 4 is connected in the central tubing string 3, pressure fluctuation is generated after injected water (liquid) passes through the jet cavitation device 4, scaling of the injected water (liquid) in cracks is prevented, the permeability of a through-flow passage is kept, the injected water (liquid) enters the second layer branch well bores B1 and B2, flows into the first layer branch well bores A1 and A2 through the transformed cracks, and flows through the oil sleeve annulus to be produced at a wellhead.
And eighth step, installing ground pumping equipment, power generation equipment and the like, completing equipment installation and debugging, and realizing dry-hot rock development of formal power generation and the like. The injection pump and the extraction pump of the invention are arranged on the ground, thus not only improving the flexibility of pump configuration, but also remarkably improving the service life and maintenance flexibility of the pump.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, unless otherwise indicated, the terms "upper," "lower," "left," "right," "inner," "outer," and the like are used for convenience in describing the present invention and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The foregoing technical solution is only one embodiment of the present invention, and various modifications and variations can be easily made by those skilled in the art based on the principles disclosed in the present invention, and are not limited to the technical solutions described in the foregoing specific examples of the present invention, therefore, the foregoing description is only preferred and not in any limiting sense.
Claims (10)
1. A completion device for efficiently developing a geothermal system for hot dry rock, wherein the completion device comprises a vertical main wellbore casing;
the vertical main well bore casing is communicated with a plurality of first layers of branch well bore casings and a plurality of second layers of branch well bore casings which are respectively oriented in different directions, and the first layers of branch well bore casings are positioned above the second layers of branch well bore casings;
a central tubing string is arranged in the vertical main well casing, a packer is connected to the central tubing string, and the packer seals an oil casing annulus formed by the vertical main well casing and the central tubing string.
2. The high efficiency development dry rock geothermal system completion of claim 1, wherein the packer is positioned between the first layer of lateral wellbore casing and the second layer of lateral wellbore casing.
3. The device of claim 1, wherein the bottom of the central tubing string mates with the bottom of the vertical main wellbore casing, and wherein a plurality of through holes are provided in the sidewall of the central tubing string at locations corresponding to the second layer of branch wellbore casing.
4. A high efficiency development dry hot rock geothermal system completion according to claim 3 wherein a jet cavitation device is connected within the central tubing string and above the second layer of lateral wellbore casing.
5. The device of claim 4, wherein a first layer of branch wellbore tubing string is disposed within the first layer of branch wellbore casing.
6. The device for efficiently developing a geothermal system for dry-rock and hot-rock, according to claim 5, wherein a first layer of branch wellbore packer is arranged in an oil casing annulus formed by the first layer of branch wellbore casing and the first layer of branch wellbore tubing string, and the first layer of branch wellbore packer is positioned at one end of the oil casing annulus close to the vertical main wellbore casing;
and a centralizer is arranged at the other end in an oil sleeve annulus formed by the first layer of branch wellbore casing and the first layer of branch wellbore tubing string.
7. The device of claim 6, wherein a second layer of branch wellbore tubing string is disposed within the second layer of branch wellbore casing.
8. The device for efficiently developing a geothermal system for dry-rock and hot-rock, according to claim 7, wherein a second layer of branch wellbore packer is arranged in an oil casing annulus formed by the second layer of branch wellbore casing and the second layer of branch wellbore tubing string, and the second layer of branch wellbore packer is positioned at one end of the oil casing annulus close to the vertical main wellbore casing;
and a centralizer is arranged at the other end in an oil sleeve annulus formed by the second layer of branch wellbore casing and the second layer of branch wellbore tubing string.
9. The device of claim 8, wherein the vertical main wellbore casing comprises a production casing and a surface casing disposed over the production casing, the bottom of the production casing being provided with a bottom hole support.
10. A method of efficiently developing a completion of a geothermal system for hot dry rock, the method comprising the steps of:
first step, main wellbore drilling construction
Firstly, performing first-drilling well down-hole surface casing, and then performing second-drilling well down-hole production casing;
second step, drilling construction of first layer branch well bore
Drilling a plurality of first layers of branch wellbores in different directions, putting a first layer of branch wellbore casing into the first layer of branch wellbore after drilling, then performing staged fracturing of the first layer of branch wellbore, and putting a first layer of branch wellbore tubing string, a centralizer and a first layer of branch wellbore packer into the first layer of branch wellbore after fracturing;
third step, drilling construction of second layer branch well bore
Drilling a plurality of second-layer branch wellbores at the designed position below the first-layer branch wellbores, putting into a second-layer branch wellbore casing after drilling, then performing staged fracturing of the second-layer branch wellbores, and putting into a second-layer branch wellbore tubing string, a centralizer and a second-layer branch wellbore packer after fracturing;
fourthly, a bottom support is arranged at the bottom of the production casing, a central tubing string is arranged in the production casing, and the central tubing string is matched with the bottom of the production casing;
fifthly, setting a packer in an oil sleeve annulus formed by the production sleeve and the central tubing string, and enabling the packer to be positioned between the first layer of branch wellbore sleeve and the second layer of branch wellbore sleeve;
and sixthly, connecting a jet cavitation device on the central tubing string to enable the jet cavitation device to be positioned above the second layer of branch wellbore casing.
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