CN111764867A - Method for inhibiting fluid loss in geothermal reservoir by using honeycomb concrete plugging agent - Google Patents
Method for inhibiting fluid loss in geothermal reservoir by using honeycomb concrete plugging agent Download PDFInfo
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- CN111764867A CN111764867A CN202010608008.1A CN202010608008A CN111764867A CN 111764867 A CN111764867 A CN 111764867A CN 202010608008 A CN202010608008 A CN 202010608008A CN 111764867 A CN111764867 A CN 111764867A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—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
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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
Abstract
The invention discloses a method for inhibiting fluid loss in a geothermal reservoir by using a honeycomb-shaped concrete plugging agent, which comprises the steps of drilling at least one injection well from the surface of the earth to the geothermal reservoir, and forming cracks communicated with the injection well on the periphery of the injection well in the thermal reservoir; and drilling the exploitation well in the expansion range of the crack near the periphery of the injection well, forming a crack communicated with the exploitation well in the thermal reservoir layer around the exploitation well, and communicating the crack near the periphery of the injection well with the crack near the periphery of the exploitation well to form a circulation channel. The invention utilizes the foaming agent to mix with the concrete to form the honeycomb concrete, and has the characteristics of simple operation, low cost, more formed pores, stability and the like. The loss of drilling mud and circulating water can be effectively reduced by injecting honeycomb concrete into natural large faults, karst caves and collapse positions of a well hole; the artificial heat storage transformation is carried out on the basis of the injection of the honeycomb concrete, an effective pore-crack communication network is formed, the fluid heat exchange area is increased, and the heat collection efficiency is improved.
Description
Technical Field
The invention relates to the technical field of geothermal energy exploitation, in particular to a method for inhibiting fluid loss in a geothermal reservoir by using a honeycomb-shaped concrete plugging agent, which is suitable for plugging in a deep geothermal reservoir containing a deep large fault, a karst cave and a loose sandstone big-belly well hole and can effectively inhibit the risk of fluid loss in geothermal exploitation.
Background
In recent 30 years, the Chinese economy has been increasing rapidly, and the proportion of the total Chinese economy to the total world economy is less than 3% in the 80's of the 20 th century, and the Chinese economy has been jumping to nearly 16.6% of the 2019's. The rapid development of economy has led to a dramatic increase in domestic demand for energy. According to statistical data, the external dependency of the Chinese petroleum in 2019 is as high as 72 percent, the external dependency of the natural gas is as high as 43 percent, and the strong unsafe factors of international politics make the risk of external continuous safe supply of the Chinese energy very high. In order to ensure the safety of energy supply in China, local energy, especially the proportion of renewable energy, should be vigorously developed. Geothermal energy is an extremely thick energy source, can be supplied continuously for 24 hours all day, has huge resource amount and stable energy form, and is rapidly developed in recent years. Generally, geothermal resources near a fracture zone are abundant, and in the development process of the geothermal resources, reservoir reconstruction methods such as hydraulic fracturing and acid fracturing are often involved, and in the hydraulic fracturing process, the existence of a natural fault or a fracture zone has a certain influence on reservoir reconstruction. On one hand, the existence of the natural fault or the fracture zone can increase the heat exchange area of the fluid, on the other hand, the injected fluid is seriously leaked due to the strong conductivity of the natural fault, so that the water loss is serious, and the earthquake risk is increased due to the slippage of the fault. For carbonate rock heat storage, particularly in the development zone of a hole or cave, bit idling and mud leakage often occur, so that well completion fails. In addition, for loose sandstone type heat storage, due to the low strength of the stratum, collapse often occurs in the drilling process, so that a large-belly well hole is generated, and the completion is difficult. In response to the problems in typical thermal stores described above, most thermal stores are treated substantially without any plugging, so that the wells in question are substantially abandoned. And special concrete is injected into the large fault zone or the strong broken zone to form a honeycomb-shaped pore space, so that the heat exchange area and the water storage space can be greatly increased, on the basis, a communicated crack-pore combination system is formed through secondary modification of methods such as hydraulic fracturing or acid fracturing, and the problem of fluid leakage can be effectively inhibited.
Disclosure of Invention
The invention aims to provide a method for preventing fluid loss in a geothermal reservoir by using a honeycomb concrete plugging agent, aiming at the problems of serious fluid loss injection, low exploitation efficiency and the like in the process of geothermal exploitation, and the method can effectively realize plugging of large faults, karst caves, large-belly boreholes and the like which cause the fluid loss in the process of geothermal exploitation, thereby greatly improving the utilization rate of geothermal circulating fluid and realizing the sustainable development of geothermal exploitation.
The above object of the present invention is achieved by the following technical solutions:
a method for inhibiting fluid loss in a geothermal reservoir by using a cellular concrete plugging agent comprises the following steps:
drilling at least one injection well from the surface to a thermal reservoir, and forming cracks communicated with the injection well on the periphery of the injection well positioned on the thermal reservoir;
drilling a production well from the ground surface to the thermal reservoir in the expansion range of the cracks near the periphery of the injection well, forming cracks communicated with the production well around the thermal reservoir of the production well, and communicating the cracks near the periphery of the injection well with the cracks near the periphery of the production well to form a circulation channel;
and step three, injecting circulating water from the injection well, wherein the circulating water sequentially passes through the cracks near the well periphery of the injection well and the cracks near the well periphery of the exploitation well, and then is exploited out of the exploitation well.
The thermal reservoir is a fracture type dry hot rock thermal reservoir:
the steps of fracture formation in a thermal reservoir near the perimeter of an injection well are: injecting high-pressure water flow into the injection well, and manually modifying the thermal reservoir around the injection well in a hydraulic fracturing mode to form cracks in the thermal reservoir around the injection well;
the method for forming the fracture in the thermal storage layer near the well periphery of the exploitation well comprises the following steps: injecting high-pressure water flow into the exploitation well, and manually modifying a thermal reservoir around the exploitation well in a hydraulic fracturing mode to form cracks in the thermal reservoir around the exploitation well;
pumping concrete into a natural fault layer in the fractured dry-hot rock thermal reservoir through the fractures near the well peripheries of the injection well or the exploitation well, and condensing the concrete to form honeycomb concrete with honeycomb pores;
the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well or the fractures in the thermal reservoir near the perimeter of the production well, or the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well and the fractures in the thermal reservoir near the perimeter of the production well.
Further comprising the steps of:
and after the honeycomb concrete is formed by condensation, performing hydraulic fracturing transformation under the action of secondary high-pressure water flow of the thermal reservoir through the injection well and the production well.
Case where the reservoir is a karst-cave carbonate-type thermal reservoir:
before drilling of the injection well and the exploitation well, concrete is injected into the detected karst cave, and after the concrete is condensed, honeycomb-shaped concrete with honeycomb-shaped pores is formed.
The steps of fracture formation in a thermal reservoir near the perimeter of an injection well are: injecting acid fluid into an injection well at high pressure, and modifying a thermal reservoir near the periphery of the injection well in an acidification fracturing mode to form cracks in the thermal reservoir near the injection well;
the method for forming the fracture in the thermal storage layer near the well periphery of the exploitation well comprises the following steps: acid fluid is injected into the exploitation well at high pressure, and the thermal reservoir around the exploitation well is modified in an acidification fracturing mode to form cracks in the thermal reservoir near the exploitation well.
The voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well or the fractures in the thermal reservoir near the perimeter of the production well, or the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well and the fractures in the thermal reservoir near the perimeter of the production well.
The thermal reservoir is a loose sandstone type thermal reservoir:
and injecting concrete into the collapse section of the injection well or the exploitation well, and forming honeycomb concrete with honeycomb pores after the concrete in the collapse section of the injection well or the exploitation well is condensed.
The steps of fracture formation in a thermal reservoir near the perimeter of an injection well are: carrying out perforation method from the injection well to the surrounding heat reservoir to reform the heat reservoir, and forming cracks in the heat reservoir near the well circumference of the injection well;
the method for forming the fracture in the thermal storage layer near the well periphery of the exploitation well comprises the following steps: and (4) carrying out perforation method from the inside of the exploitation well to the surrounding thermal reservoir to reform the thermal reservoir, and forming cracks in the thermal reservoir near the circumference of the exploitation well.
The concrete is formed by mixing a foaming agent and concrete.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention utilizes the ZML-1 foaming agent to mix with the concrete to form the honeycomb concrete, and has the characteristics of simple operation, low cost, more formed pores, stability and the like.
2. The loss of drilling mud and circulating water can be effectively reduced by injecting honeycomb concrete into natural large faults, karst caves and collapse positions of a well hole;
3. the artificial heat storage transformation is carried out on the basis of the injection of the honeycomb concrete, an effective pore-crack communication network is formed, the fluid heat exchange area is increased, and the heat collection efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a large fault plugging process of a fractured dry-hot rock reservoir, wherein (A) is a schematic diagram of concrete pumped into a natural fault; (B) a schematic diagram of secondary hydraulic fracturing heat storage transformation under the action of high-pressure water flow;
FIG. 2 is a schematic diagram of a plugging process of a carbonate karst cave type geothermal reservoir, wherein (A) is a schematic diagram of the location of a karst cave; (B) to illustrate after formation of a fracture;
FIG. 3 is a schematic diagram of a honeycomb concrete plugging process after a big belly well hole collapses, wherein (A) is a schematic diagram of the big belly well hole; (B) to illustrate after the formation of the fracture.
In the drawings, the reference numerals denote:
1-a ground pipeline; 2-a mudstone layer; 3-an injection well under the condition that the thermal reservoir is a fractured dry-hot rock thermal reservoir; 4-a production well under the condition that the thermal reservoir is a fractured dry-hot rock thermal reservoir; 5-a hot dry rock reservoir; 6-hydraulic fracturing of fractures; 7-natural fault; 8-connected fractures; 9-an injection well in the case that the thermal reservoir is a karst-cave carbonate-type thermal reservoir; 10-a production well under the condition that the thermal reservoir is a carbonate rock type thermal reservoir containing a karst cave; 11-karst cave; a 12-carbonate formation; 13-cellular concrete; 14-acid fracturing the fracture; 15-overburden of unconsolidated sandstone reservoirs; 16-a production well under the condition that the thermal reservoir is a loose sandstone type thermal reservoir; 17-a unconsolidated sandstone layer; 18-big belly wellbore; 19-a hot water layer; 20-perforation seams.
Detailed Description
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
A method of preventing fluid loss from a geothermal reservoir using a cellular concrete plugging agent comprising the steps of:
drilling at least one injection well from the surface of the earth to a thermal reservoir, forming cracks communicated with the injection well around the part of the injection well, which is positioned in the thermal reservoir, and monitoring the expansion range of the cracks near the injection well by using microseismic;
drilling a production well from the ground surface to the thermal reservoir in the expansion range of the fracture near the periphery of the injection well, forming a production well fracture communicated with the production well around the part of the production well, which is positioned in the thermal reservoir, and communicating the injection well fracture with the production well fracture to form a circulating channel;
and step three, injecting circulating water from the injection well, wherein the circulating water is produced from the production well after sequentially passing through the cracks in the thermal storage layer near the well periphery of the injection well and the cracks in the thermal storage layer near the well periphery of the production well.
Aiming at the condition that the thermal reservoir is a fractured dry-hot rock thermal reservoir:
the injection well fracture formation steps are: high-pressure fluid (water can be used) is injected into the injection well, and the thermal reservoir around the injection well is artificially reformed by adopting a hydraulic fracturing mode to form cracks (hydraulic fractures) in the thermal reservoir around the injection well.
The method for forming the fractures near the well periphery of the production well comprises the following steps: high-pressure fluid (water) is injected into the production well, the thermal reservoir around the production well is artificially transformed in a hydraulic fracturing mode, and cracks in the thermal reservoir around the production well are formed, so that the fluid heat exchange area of the production well can be enlarged.
Pumping concrete into a natural large fault in the fractured dry hot rock thermal reservoir through cracks in the thermal reservoir near the periphery of the injection well or cracks in the thermal reservoir near the periphery of the exploitation well, and forming cellular concrete with cellular pores after the concrete is condensed to prevent the leakage of circulating fluid; meanwhile, the heat exchange area of the circulating fluid in the cracks in the thermal storage layer near the well periphery of the injection well or the cracks in the thermal storage layer near the well periphery of the production well can be increased.
The pores in the cellular concrete are in communication with the fissures in the thermal storage layer near the perimeter of the injection well or the thermal storage layer near the perimeter of the production well, or the pores in the cellular concrete are in communication with the fissures in the thermal storage layer near the perimeter of the injection well and the fissures in the thermal storage layer near the perimeter of the production well.
In order to prevent the honeycomb concrete from completely blocking natural cracks in the thermal storage layers near the periphery of the injection well and near the periphery of the production well, cracks in the thermal storage layers near the periphery of the injection well or cracks in the thermal storage layers near the periphery of the production well, secondary hydraulic fracturing reformation can be performed by injecting fluid at high pressure through the injection well and the production well after the honeycomb concrete is formed by condensation. Because the strength of the natural cracks, the cracks in the thermal storage layer near the periphery of the injection well and the honeycomb-shaped concrete in the cracks in the thermal storage layer near the periphery of the exploitation well is lower than that of the hot dry rock thermal storage layer, the cracks in the thermal storage layer near the periphery of the injection well and the cracks in the thermal storage layer near the periphery of the exploitation well after the secondary hydraulic fracturing can be expanded along the distribution direction of the cracks before plugging, so that the leakage of circulating fluid is prevented, the flow path of the circulating fluid is prolonged, and the sufficient fluid heat exchange is realized.
Aiming at the condition that the heat reservoir is a carbonate rock type heat reservoir containing a karst cave:
in the drilling process or the thermal reservoir transformation process of the injection well and the exploitation well (namely, in the formation process of cracks in the thermal reservoir near the injection well and cracks in the thermal reservoir near the exploitation well), the existence of the karst cave can cause serious loss of mud or injected water, and the exploitation efficiency of geothermal water is seriously influenced. Therefore, before the well drilling of the injection well and the production well, concrete can be injected into the detected karst cave, and after the concrete is condensed, cellular concrete is formed.
The fracture forming step in the thermal reservoir near the well periphery of the injection well comprises the following steps: acid fluid is injected into the injection well at high pressure, and the thermal reservoir near the well periphery of the injection well is artificially reconstructed in an acidizing and fracturing mode to form cracks in the thermal reservoir near the well periphery of the injection well.
The method for forming the fracture in the thermal storage layer near the well periphery of the exploitation well comprises the following steps: acid fluid is injected into the production well at high pressure, the thermal reservoir near the well periphery of the production well is artificially transformed in an acidification fracturing mode, and cracks in the thermal reservoir near the well periphery of the production well are formed, so that the fluid heat exchange area of the production well can be enlarged.
The acid fluid injected in the acid fracturing adopts the water-based polymer fracturing fluid commonly used at present.
The voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well or the fractures in the thermal reservoir near the perimeter of the production well, or the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well and the fractures in the thermal reservoir near the perimeter of the production well.
Aiming at the condition that the heat reservoir is a loose sandstone type heat reservoir;
collapse of the wellbore, and even formation of a upset wellbore, often occurs during drilling of an injection or production well. The concrete is injected into the collapse section of the injection well or the exploitation well, and the honeycomb-shaped concrete with the honeycomb-shaped pores is formed after the concrete in the collapse section of the injection well or the exploitation well is condensed.
The fracture forming step in the thermal reservoir near the well periphery of the injection well comprises the following steps: and carrying out manual reconstruction on the thermal reservoir by using a perforation method from the inside of the injection well to the thermal reservoir at the periphery to form cracks in the thermal reservoir near the well periphery of the injection well.
The method for forming the fracture in the thermal storage layer near the well periphery of the exploitation well comprises the following steps: and carrying out manual transformation on the thermal reservoir by using a perforation method from the interior of the exploitation well to the thermal reservoir at the periphery to form cracks in the thermal reservoir near the well periphery of the exploitation well.
The voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well or the fractures in the thermal reservoir near the perimeter of the production well, or the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well and the fractures in the thermal reservoir near the perimeter of the production well.
The perforation method adopts the method and the flow which are commonly used in the petroleum industry and the geothermal exploitation.
The honeycomb-shaped pore-crack mutual communication is realized, the heat exchange area can be increased, the big-belly well hole can be repaired, and the stratum near the original big-belly well hole is inhibited from continuously collapsing.
After the adverse factors causing fluid loss in the geothermal reservoir are repaired, a good fluid circulation channel can be formed through secondary reservoir transformation, and sustainable geothermal exploitation is realized.
The concrete used in the invention is prepared by mixing the foaming agent and the concrete, the foaming amount of the foaming agent is ensured to be rich, the stability of the foam is ensured to be good, the foaming agent can be ZML-1 foaming agent, and the formula of the foaming agent mainly comprises sodium dodecyl sulfate (4g/L) + dodecanol (0.7g/L) + hydroxyethyl cellulose (1.8g/L) + triethanolamine (6 g/L).
And when the fluid pressure obtained by the well fluid pressure monitors in the injection well and the component obtained by the component monitors in the extraction well are similar, the fracture in the thermal storage layer near the injection well is communicated with the fracture in the thermal storage layer near the extraction well, and a circulating channel is formed.
It should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. The method for inhibiting the fluid loss in the geothermal reservoir by using the honeycomb concrete plugging agent is characterized by comprising the following steps of:
drilling at least one injection well from the surface to a thermal reservoir, and forming cracks communicated with the injection well on the periphery of the injection well positioned on the thermal reservoir;
drilling a production well from the ground surface to the thermal reservoir in the expansion range of the cracks near the periphery of the injection well, forming cracks communicated with the production well around the thermal reservoir of the production well, and communicating the cracks near the periphery of the injection well with the cracks near the periphery of the production well to form a circulation channel;
and step three, injecting circulating water from the injection well, wherein the circulating water sequentially passes through the cracks near the well periphery of the injection well and the cracks near the well periphery of the exploitation well, and then is exploited by the exploitation well.
2. The method for suppressing fluid loss from a geothermal reservoir using a cellular concrete plugging agent according to claim 1, wherein in the case where the thermal reservoir is a fractured-type hot dry rock thermal reservoir,
the steps of fracture formation in a thermal reservoir near the perimeter of an injection well are: injecting high-pressure water flow into the injection well, and modifying the thermal reservoir around the injection well in a hydraulic fracturing mode to form cracks in the thermal reservoir around the injection well;
the method for forming the fracture in the thermal storage layer near the well periphery of the exploitation well comprises the following steps: injecting high-pressure water flow into the exploitation well, reforming a thermal reservoir around the exploitation well in a hydraulic fracturing mode, and forming cracks in the thermal reservoir around the exploitation well;
pumping concrete into a natural fault layer in the fractured dry-hot rock thermal reservoir through the fractures near the well peripheries of the injection well or the exploitation well, and condensing the concrete to form honeycomb concrete with honeycomb pores;
the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well or the fractures in the thermal reservoir near the perimeter of the production well, or the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well and the fractures in the thermal reservoir near the perimeter of the production well.
3. The method of using cellular concrete plugging agents to inhibit fluid loss from a geothermal reservoir according to claim 2, further comprising the steps of:
and performing hydraulic fracturing transformation on secondary high-pressure water flow of the thermal reservoir through the injection well and the production well after the honeycomb concrete is formed by condensation.
4. The method of using cellular concrete plugging agent to suppress fluid loss from a geothermal reservoir according to claim 1, wherein in the case where the thermal reservoir is a cavern-containing carbonate-type thermal reservoir, comprising the steps of:
before drilling of the injection well and the exploitation well, concrete is injected into the detected karst cave, and after the concrete is condensed, honeycomb-shaped concrete with honeycomb-shaped pores is formed.
5. The method for suppressing fluid loss from a geothermal reservoir using a cellular concrete plugging agent according to claim 4,
the steps of fracture formation in a thermal reservoir near the perimeter of an injection well are: injecting acid fluid into an injection well at high pressure, and modifying a thermal reservoir near the periphery of the injection well in an acidification fracturing mode to form cracks in the thermal reservoir near the injection well;
the method for forming the fracture in the thermal storage layer near the well periphery of the exploitation well comprises the following steps: acid fluid is injected into the exploitation well at high pressure, and the thermal reservoir around the exploitation well is modified in an acidification fracturing mode to form cracks in the thermal reservoir near the exploitation well.
6. The method for suppressing fluid loss from a geothermal reservoir using a cellular concrete plugging agent according to claim 5,
the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well or the fractures in the thermal reservoir near the perimeter of the production well, or the voids in the cellular concrete are in communication with the fractures in the thermal reservoir near the perimeter of the injection well and the fractures in the thermal reservoir near the perimeter of the production well.
7. The method of claim 1 for suppressing fluid loss from a geothermal reservoir using a cellular concrete plugging agent, wherein the thermal reservoir is a unconsolidated sandstone-type thermal reservoir, comprising the step of injecting concrete into a collapsed section of an injection well or a production well, and forming cellular concrete having cellular pores after the concrete in the collapsed section of the injection well or the production well is condensed.
8. The method for suppressing fluid loss from a geothermal reservoir using a cellular concrete plugging agent according to claim 7,
the steps of fracture formation in a thermal reservoir near the perimeter of an injection well are: carrying out perforation method from the injection well to the surrounding heat reservoir to reform the heat reservoir, and forming cracks in the heat reservoir near the well circumference of the injection well;
the method for forming the fracture in the thermal storage layer near the well periphery of the exploitation well comprises the following steps: and (4) carrying out perforation method from the inside of the exploitation well to the surrounding thermal reservoir to reform the thermal reservoir, and forming cracks in the thermal reservoir near the circumference of the exploitation well.
9. The method for inhibiting fluid loss from a geothermal reservoir using a cellular concrete plugging agent according to any one of claims 1 to 8, wherein the concrete is formed by mixing a foaming agent and the concrete.
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