CN114152554A - Hydraulic shear stimulation hot dry rock reservoir permeability increasing simulation experiment system and experiment method - Google Patents
Hydraulic shear stimulation hot dry rock reservoir permeability increasing simulation experiment system and experiment method Download PDFInfo
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Abstract
The invention discloses a hydraulic shear stimulation hot dry rock reservoir permeability-increasing simulation experiment system and an experiment method, and the experiment system comprises an experiment part, a water circulation part and a control part; the experiment part is used for carrying out simulation experiments on the test piece and comprises a frame, an experiment assembly and a pressure applying assembly are fixedly connected to the frame, and the pressure applying assembly is fixedly installed with the frame; the test piece is arranged in the experiment assembly; the water circulation part is used for performing water circulation simulation hydraulic shearing in a simulation experiment; the water circulation part comprises a water inlet component and a water return component; the water inlet assembly and the water return assembly are communicated with the experiment assembly; the control part is used for automatically controlling the experiment; the control part is respectively and electrically connected with the experiment part and the water circulation part. The experimental device disclosed by the invention is simple in structure and novel in experimental method, can truly simulate the constant rigidity boundary condition under the deep stratum, simulate the occurrence of rock stratum hydraulic shear slip, explore the law and condition of the occurrence of slip, provide theoretical support for the anti-reflection of the deep geothermal reservoir and accelerate the process of large-scale commercial exploitation of geothermal heat.
Description
Technical Field
The invention relates to the technical field of geothermal development of hot dry rock, in particular to a hydraulic shear stimulation hot dry rock reservoir permeability increasing simulation experiment system and an experiment method.
Background
The Enhanced Geothermal System (EGS) is characterized in that a crack net is artificially constructed in an underground high-temperature rock body by utilizing engineering technology or an original crack net is improved, the constructed or improved crack net has enough permeability, the rock volume and the crack surface area are large enough, so that cold water injected from the ground surface flows through the crack net and returns to the ground surface, the temperature of the cold water is increased, and flash evaporation or double circulation power generation or heat supply is utilized. Thus, EGS includes both engineered underground heat storage and rock underground heat storage that has been engineered to improve or enhance rock permeability. The existing EGS aims at shallow geothermal exploitation, and is generally supported by a proppant through acid corrosion of a channel; however, the stratum at the deep part is granite, the hardness is high, acid cannot corrode a channel, the gap width of the existing crack is larger than the diameter of the propping agent, the propping effect is poor, and the propping agent is easy to crush due to the large deep part ground stress.
In deep geothermal exploitation, hydraulic fracturing is generally adopted to form a fracture network to form a water flow channel, and the granite stratum is driven by the hydraulic power to slide to form a support, so that the fracture channel is prevented from being closed under the action of huge ground stress; however, the constant load boundary condition adopted in the current hydraulic shear slip simulation experiment is not consistent with the constant stiffness boundary of the actual stratum, and the simulated experimental data is not representative, so that a hydraulic shear stimulation hot dry rock reservoir permeability increasing simulation experimental system and an experimental method are urgently needed to perform simulation under the constant stiffness boundary condition, obtain more representative simulated data, and provide data support for deep hot dry rock geothermal development.
Disclosure of Invention
The invention aims to provide a hydraulic shear stimulation hot dry rock reservoir permeability increasing simulation experiment system and an experiment method, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a hydraulic shear stimulation hot dry rock reservoir permeability increasing simulation experiment system and an experiment method, comprising
The experiment part is used for carrying out simulation experiments on the test piece; the experiment part comprises a frame, an experiment assembly is fixedly connected to the frame, a pressure applying assembly is arranged at the top end in the experiment assembly, and the pressure applying assembly is fixedly installed with the frame; the test piece is arranged in the experiment assembly;
the water circulation part is used for performing water circulation simulation hydraulic shearing in a simulation experiment; the water circulation part comprises a water inlet assembly and a water return assembly; the water inlet assembly and the water return assembly are both communicated with the experiment assembly;
a control section for automatically controlling the progress of an experiment; the control part is respectively and electrically connected with the experiment part and the water circulation part.
Preferably, the experimental part comprises a bottom plate fixed on the frame, a confining pressure chamber is abutted to the top surface of the bottom plate, the test piece is installed in the confining pressure chamber, a pressure head matched with the inner cavity of the confining pressure chamber is abutted to the top surface of the test piece, and the top surface of the pressure head is fixedly connected with the pressure applying assembly; the pressure head is communicated with the water return assembly, and the bottom plate is communicated with the water inlet assembly.
Preferably, the control part comprises a control panel and a monitoring component which are electrically connected; the monitoring assembly is mounted on the confining pressure chamber, and a probe of the monitoring assembly abuts against the test piece and is used for detecting the displacement of the test piece; the control panel is respectively electrically connected with the experiment part and the water circulation part.
The anti-reflection simulation experiment method for the hydraulic shear stimulated hot dry rock reservoir comprises the following experiment steps:
manufacturing a test piece, and recording test piece data;
mounting a test piece;
connecting an experiment system;
carrying out an experiment;
and recording experimental data in real time.
Preferably, in the step of manufacturing the test piece, an included angle between the inclined plane of the test piece and the vertical axis is θ.
Preferably, in the step of installing the test piece, a rubber sleeve is sleeved on the side wall of the test piece; the monitoring assembly is used for detecting the radial displacement delta z and the axial displacement delta x of the test piece.
Preferably, in the performing experiment step, a confining pressure σ is applied to the test piece by the confining pressure chamber3The pressure head applies axial pressure sigma to the test piece1The water inlet pressure of the water inlet component is P0The water return pressure of the water return component is P1。
Preferably, in the performing step, the confining pressure σ is set to be lower than the critical pressure3And the axial pressure σ1And updating iteration in real time to achieve the condition of constant boundary rigidity.
Preferably, the initial shear stress τ is from 0.9 to 0.95 times the peak shear stress in the conducting step.
Preferably, in the step of performing the experiment, the confining pressure σ is applied to the test piece first3And the axial pressure σ1Then gradually increasing the water inlet pressure to P0The pressure of the return water is P1The confining pressure σ3And the axial pressure σ1Changing along with the change, the boundary rigidity kn is ensured to be constant.
The invention discloses the following technical effects: the invention discloses a hydraulic shear stimulation hot dry rock reservoir permeability-increasing simulation experiment system and an experiment method, wherein a test piece is subjected to a hydraulic shear simulation experiment through the experiment system, and a hydraulic shear process is carried out after hydraulic fracturing of granite under a deep stratum is simulated, so that the pressed granite slides, and fracture surfaces are mutually supported to prevent fractures from being closed by high pressure; by simulating the actual situation under the deep stratum, the conditions and the rules of hydraulic shear slip generation are explored, data support is provided for the actual hydraulic shear slip, convenience is brought to deep geothermal exploitation and use, and a further data basis is provided for the utilization of an EGS system; compared with the conventional constant load boundary condition, the constant rigidity boundary condition adopted by the test method disclosed by the invention can better simulate the geological environment under the deep stratum, the obtained data is more accurate and more practical, and theoretical support is provided for geothermal exploitation of the deep stratum. The experimental device disclosed by the invention is simple in structure and novel in experimental method, can truly simulate the constant rigidity boundary condition under a deep stratum, simulate the generation of rock stratum water conservancy shear slip, explore the law and condition of the slip generation, provide theoretical support for deep geothermal hydraulic fracturing and slip, and accelerate the progress of geothermal development.
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 diagram of a testing system according to the present invention;
FIG. 2 is a schematic view of the structure of the test section of the present invention;
FIG. 3 is a schematic diagram of the experimental assembly of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a chart of the test specimen in the test method of the present invention;
FIG. 6 is a line graph of test data in the present invention;
wherein, 1, a test piece; 2. a frame; 3. an experimental component; 4. a pressure applying assembly; 5. a water intake assembly; 6. a water return assembly; 7. a control panel; 8. a monitoring component; 9. a rubber sleeve; 11. a first module; 12. a second module; 13. a slip surface; 14. a first water hole; 15. a second water hole; 31. a base plate; 32. a confining pressure chamber; 33. a pressure head; 34. a first perforated plate; 35. a second perforated plate; 51. a water inlet tank; 52. a water inlet pump; 53. a water inlet valve; 61. returning to a water tank; 62. a water return pump; 63. a water return valve.
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.
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.
Referring to fig. 1-6, the invention provides a hydraulic shear stimulation hot dry rock reservoir permeability increase simulation experiment system and an experiment method, comprising
The experiment part is used for carrying out simulation experiments on the test piece 1; the experiment part comprises a frame 2, an experiment component 3 is fixedly connected to the frame 2, a pressure applying component 4 is arranged at the top end in the experiment component 3, and the pressure applying component 4 is fixedly installed with the frame 2; the test piece 1 is arranged in the experiment assembly 3;
the water circulation part is used for carrying out water circulation simulation hydraulic shearing in a simulation experiment; the water circulation part comprises a water inlet component 5 and a water return component 6; the water inlet assembly 5 and the water return assembly 6 are both communicated with the experiment assembly 3;
a control part for automatically controlling the experiment; the control part is respectively and electrically connected with the experiment part and the water circulation part.
According to the invention, the experiment part simulates the stratum environment, the water circulation part provides water circulation for water conservancy shearing, the control part controls the experiment to be carried out, and the hydraulic shearing process is carried out after hydraulic fracturing of granite under deep stratum is deeply simulated, so that the pressed granite slides, and the crack surfaces are mutually supported, thereby preventing the crack from being closed by high pressure; by simulating the actual situation under the deep stratum, the conditions and the rules of hydraulic shear slip generation are explored, data support is provided for the actual hydraulic shear slip, convenience is brought to deep geothermal exploitation and use, and a further data basis is provided for the utilization of an EGS system; compared with the conventional constant load boundary condition, the constant rigidity boundary condition adopted by the test method disclosed by the invention can better simulate the geological environment under the deep stratum, the obtained data is more accurate and more practical, and theoretical support is provided for geothermal exploitation of the deep stratum.
Further, the test piece 1 comprises a first module 11 and a second module 12 which are spliced up and down, and a splicing surface between the first module 11 and the second module 12 forms a sliding surface 13; a first water hole 14 is longitudinally formed at the top end of the first module 11, and the first water hole 14 is communicated with the sliding surface 13; a second water hole 15 is longitudinally formed in the bottom surface of the second module 12, and the second water hole 15 is communicated with the sliding surface 13; during the experiment, water flow stimulating slippage enters the test piece 1 from the second hole, rises along the slippage surface 13 and then flows out from the first hole, and the first module 11 and the second module 12 generate slippage along the slippage surface 13 under the driving of water pressure; the slip surface 13 is a rough contact surface.
According to a further optimized scheme, the experimental part comprises a bottom plate 31 fixed on the frame 2, the top surface of the bottom plate 31 is abutted with a confining pressure chamber 32, the test piece 1 is installed in the confining pressure chamber 32, the top surface of the test piece 1 is abutted with a pressure head 33 matched with the inner cavity of the confining pressure chamber 32, and the top surface of the pressure head 33 is fixedly connected with the pressure applying assembly 4; the pressure head 33 is communicated with the water return assembly 6, and the bottom plate 31 is communicated with the water inlet assembly 5. During the experiment, water is pressed into the test piece 1 from the water inlet assembly 5 at a specific pressure and is recovered from the water return assembly 6.
Further, the water inlet assembly 5 comprises a water inlet tank 51, the water inlet tank 51 is communicated with a water inlet hole of the bottom plate 31 through a pipeline, and the pipeline is provided with a water inlet valve 53 and a water inlet pump 52 to control the on-off of water inlet and the water inlet pressure so as to simulate water supply in hydraulic shearing; the water inlet valve 53 is an electromagnetic valve, the water inlet pump 52 has a pressure regulating function, the water inlet valve 53 and the water inlet pump 52 are electrically connected with the control panel 7, and the water inlet time and the water inlet pressure of the water inlet assembly 5 are controlled through the control panel 7, which is the prior art and is not described in detail again.
Further, the water return assembly 6 comprises a water return tank 61 communicated with the water outlet hole of the pressure head 33 through a pipeline, and a water return valve 63 and a water return pump 62 are communicated on the pipeline and used for recovering water supply for a water conservancy shearing experiment and detecting water return pressure; wherein, the water return valve 63 and the water return pump 62 are both electrically connected to the control panel 7, and are prior art and will not be described herein again.
Furthermore, a second porous plate 35 is arranged between the top surface of the bottom plate 31 and the bottom surface of the pressure head 33 at the upper end and the lower end of the test piece 1 respectively, a water inlet hole of the bottom plate is communicated with the second porous plate 35, water enters a second water hole 15 of the test piece 1 through a through hole of the second porous plate 35, rises along the sliding surface 13, finally flows out of the first water hole 14, enters a water outlet hole in the pressure head 33 through the second porous plate 35 above, and water circulation is completed; the second porous plate 35 is used to uniformly distribute the pressure applied by the indenter 33 so that the pressure of the indenter 33 uniformly acts on the top end of the test piece 1.
Further, the side wall of the test piece 1 is provided with a first porous plate 34, and the probe of the monitoring assembly 8 is fixed on the first porous plate 34 and used for detecting the displacement when the test piece 1 slides.
In a further optimized scheme, the control part comprises a control panel 7 and a monitoring component 8 which are electrically connected; the monitoring assembly 8 is arranged on the confining pressure chamber 32, and a probe head of the monitoring assembly is abutted against the test piece 1 and is used for detecting the displacement of the test piece 1; the control panel 7 is respectively electrically connected with the experiment part and the water circulation part.
Furthermore, the monitoring component 8 is preferably a linear variable differential transformer, can perform linear voltage transformation according to the displacement of the test piece 1, and is high in sensitivity, practical and convenient; the linear variable differential transformer is prior art and will not be described herein.
The anti-reflection simulation experiment method for the hydraulic shear stimulated hot dry rock reservoir comprises the following experiment steps:
manufacturing a test piece 1, and recording data of the test piece 1; manufacturing a test piece 1 according to geological conditions of a stratum to be simulated, wherein the deep stratum is composed of granite with stable properties, so that the test piece 1 in the embodiment is made of granite; cutting granite into a cylinder which is matched with the test part, obliquely dividing the side wall of the cylinder into a first module 11 and a second module 12, and forming a sliding surface 13 with certain roughness by a separation line of the first module and the second module; a first water hole 14 and a second water hole 15 which are vertical are respectively rotated on the first module 11 and the second module 12 to be communicated with a sliding surface 13 formed by joint surfaces of the first water hole and the second water hole; the outside dimensions of the test piece 1 and the angle of the slip plane 13 from the vertical are recorded as θ.
Installing a test piece 1; the permeability of the first water hole 14 and the second water hole 15 ensures that the communicating sliding surface 13 is smooth, then a layer of rubber sleeve 9 is sleeved on the periphery of the test piece 1 to prevent the water pressure in the test piece 1 from leaking, and prevent the hydraulic oil in the confining pressure chamber 32 from permeating into the test piece 1 to influence the experimental result, finally, a first porous plate 34 is installed outside the rubber sleeve 9 and the monitoring assembly 8 is installed on the porous plate according to the requirement, finally, the test piece 1 is vertically placed on the bottom plate 31 in the confining pressure chamber 32, and a second porous plate 35 is laid between the bottom plate 31 and the test piece 1; then a layer of porous mounting is mounted on the practical top end, and the pressure head 33 is pressed on the practical top surface to complete the mounting of the test piece 1.
Connecting an experiment system; a water pipe of the water inlet component 5 is communicated with a water inlet hole of the bottom plate 31, a water pipe of the water return component 6 is communicated with a water outlet hole of the pressure head 33, and a water inlet pump 52, a water inlet valve 53, a water return pump 62 and a water return valve 63 decibels are electrically connected with the control panel 7; the confining pressure chamber 32 is filled with hydraulic oil, the hydraulic oil generates confining pressure on the test piece 1, and the pressure of the hydraulic oil is recorded as sigma3The pressing assembly 4 applies a downward axial pressure σ to the test piece 1 by the indenter 331The shear stress profile of the test piece 1 on the control panel 7 was observed so that the shear stress τ of the experiment was 0.9 to 0.95 times, preferably 0.92 times, the peak shear stress and was kept constant, and the confining pressure σ 3 and the axial pressure σ 1 at that time were recorded, wherein
σn′＝(σ3-Pp)+(σ1-σ3)sin2θ
τ＝(σ1-σ3)sinθcosθ ①
Where τ is the shear stress of the test piece 1, σn' is the normal stress of test piece 1; theta is an included angle between the slip plane 13 and the vertical direction; sigma1Axial pressure applied to the test piece 1 for the indenter 33; sigma3Confining pressure applied to the test piece 1 for the confining pressure chamber 32.
Carrying out an experiment; the test is started, the control panel 7 is used for controlling the water inlet pump 52 and the water inlet valve 53,The water return pump 62 and the water return valve 63 are opened, water in the water inlet tank 51 is pumped into the test piece 1 from the water inlet hole of the bottom plate 31, the water rises along the sliding surface 13 and finally flows out from the water outlet hole of the pressure head 33 through the water return pump 62, and the water pressure of the water inlet hole of the bottom plate 31 is recorded as P0The water pressure of the water outlet hole of the pressure head 33 is P1The hydraulic power in the experiment is then:
wherein, PpRecording the Water pressure, P, for the experiment0For the pressure of the inlet water, P1The water outlet pressure is adopted.
The control panel 7 controls the water inlet pump 52 and the water return pump 62 to change the water inlet pressure P0And the pressure P of return water1To make the experimental water pressure PpAccording to the set amplification rise, the increase is not carried out once, the stability is carried out for 5min-10min, the radial displacement delta z and the axial displacement delta x of the first module 11 of the test piece 1 on the sliding surface 13 are recorded through the monitoring component 8, and the calculation is carried out according to the formula:
dn＝Δzsinθ-Δxcosθ
ds＝Δzcosθ+Δxsinθ ③
wherein dn is the normal displacement of the test piece 1, and ds is the shear displacement of the test piece 1; delta z is the radial displacement of the test piece 1, delta x is the axial displacement of the test piece 1, and theta is the included angle between the sliding surface 13 and the vertical direction;
according to the constant stiffness boundary condition formula:
σn’(t+Δt)＝σn’(t)+kn·d n ④
wherein σn' is the normal stress of test piece 1, kn is the normal stiffness, σn' (t + Δ t) is the normal stress at the next time, σn' (t) is the normal stress at this time, dn is the normal displacement of the test piece 1; the value of kn is assigned according to the actual formation condition to be simulated.
Substituting formula (c) into (c) to calculate sigman' substituting the formula to calculate sigma1And σ3Thereby achieving a constant normal stiffness boundary condition. Transforming the formula (I) can obtain the formula (V),
σn′＝σ1sin2θ+(1-sin2θ)σ3-Pp
τ＝σ1sinθcosθ-σ3sinθcosθ ⑤
the calculation of the probability of the calculation is carried out,
and
and is disclosed in sixth to seventh to get,
[σn′+Pp-(1-sin2θ)σ3]sinθcosθ＝(τ+σ3sinθcosθ)sin2θ ⑧
calculated by the formula [ sigma ]3And will be3The numerical value is substituted into a formula (c) to obtain the sigma1The numerical value of (c).
According to the calculated achieved sigma1And σ3When P is the numerical value of (A), through numerical control programming of the control panel 7pAfter a single rise, σ1And σ3The value of (1) is subjected to corresponding iterative change, so that the normal stiffness kn is kept unchanged; wherein the numerical control of the control panel 7 is calculated1And σ3The algorithm for adjusting the numerical value of (a) is commonly used in industrial production and testing.
And recording experimental data in real time. Recording input data for each stage, including applying a confining pressure σ to the test piece 1 via the confining chamber 323The indenter 33 applies an axial pressure σ to the test piece 11The water inlet pressure of the water inlet component 5 is P0The water return pressure of the water return component 6 is P1And the whole process of the slippage of the test piece 1 is observed and photographed.
The experimental device disclosed by the invention is simple in structure and novel in experimental method, can truly simulate the constant rigidity boundary condition under a deep stratum, simulate the generation of rock stratum water conservancy shear slip, explore the law and condition of the slip generation, provide theoretical support for deep geothermal hydraulic fracturing and slip, and accelerate the progress of geothermal development.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A hydraulic shear stimulation hot dry rock reservoir permeability-increasing simulation experiment system is characterized in that: comprises that
An experiment part for performing a simulation experiment on a test piece (1); the experiment part comprises a frame (2), an experiment component (3) is fixedly connected to the frame (2), a pressure applying component (4) is arranged at the top end of the experiment component (3), and the pressure applying component (4) is fixedly installed with the frame (2); the test piece (1) is arranged in the experiment assembly (3);
the water circulation part is used for performing water circulation simulation hydraulic shearing in a simulation experiment; the water circulation part comprises a water inlet assembly (5) and a water return assembly (6); the water inlet assembly (5) and the water return assembly (6) are both communicated with the experiment assembly (3);
a control section for automatically controlling the progress of an experiment; the control part is respectively and electrically connected with the experiment part and the water circulation part.
2. The hydraulic shear stimulation hot dry rock reservoir permeability improvement simulation experiment system of claim 1, wherein: the experimental part comprises a bottom plate (31) fixed on the frame (2), the top surface of the bottom plate (31) is abutted with a confining pressure chamber (32), the test piece (1) is installed in the confining pressure chamber (32), the top surface of the test piece (1) is abutted with a pressure head (33) matched with the inner cavity of the confining pressure chamber (32), and the top surface of the pressure head (33) is fixedly connected with the pressure applying assembly (4); the pressure head (33) is communicated with the water return assembly (6), and the bottom plate (31) is communicated with the water inlet assembly (5).
3. The hydraulic shear stimulation hot dry rock reservoir permeability improvement simulation experiment system of claim 2, wherein: the control part comprises a control panel (7) and a monitoring component (8) which are electrically connected; the monitoring assembly (8) is arranged on the confining pressure chamber (32), and a probe head of the monitoring assembly (8) is abutted to the test piece (1) and used for detecting the displacement of the test piece (1); the control panel (7) is respectively electrically connected with the experiment part and the water circulation part.
4. The hydraulic shear stimulation hot dry rock reservoir permeability-increasing simulation experiment method is characterized by comprising the following experiment steps of:
manufacturing a test piece (1) and recording the data of the test piece (1);
mounting a test piece (1);
connecting an experiment system;
carrying out an experiment;
and recording experimental data in real time.
5. The hydraulic shear stimulation hot dry rock reservoir permeability improvement simulation experiment method of claim 4 is characterized in that: in the step of manufacturing the test piece (1), an included angle between the inclined plane of the test piece (1) and the vertical axis is theta.
6. The hydraulic shear stimulation hot dry rock reservoir permeability improvement simulation experiment method of claim 4 is characterized in that: in the step of installing the test piece (1), a rubber sleeve is sleeved on the side wall of the test piece (1); the monitoring assembly (8) is used for detecting the radial displacement delta z and the axial displacement delta x of the test piece (1).
7. The hydraulic shear stimulation hot dry rock reservoir permeability improvement simulation experiment method of claim 4 is characterized in that: in the step of performing an experiment, a confining pressure σ is applied to the test piece (1) through the confining pressure chamber (32)3，The indenter (33) applies an axial pressure σ to the test piece (1)1The water inlet pressure of the water inlet component (5) is P0The water return pressure of the water return component (6) is P1。
8. The hydraulic shear stimulation hot dry rock reservoir permeability improvement simulation experiment method of claim 7 is characterized in that: in the step of performing an experiment, the confining pressure σ3And the axial pressure σ1And updating iteration in real time to achieve the condition of constant boundary rigidity.
9. The hydraulic shear stimulation hot dry rock reservoir permeability improvement simulation experiment method of claim 8 is characterized in that: in the experimental procedure, the initial shear stress τ is 0.9 to 0.95 times the peak shear stress.
10. The hydraulic shear stimulation hot dry rock reservoir permeability improvement simulation experiment method of claim 9 is characterized in that: in the experiment step, the confining pressure sigma is firstly applied to a test piece (1)3And the axial pressure σ1Then gradually increasing the water inlet pressure to P0The pressure of the return water is P1The confining pressure σ3And the axial pressure σ1Varying therewith to ensure boundary stiffness knIs constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111470121.9A CN114152554B (en) | 2021-12-03 | 2021-12-03 | Hydraulic shear stimulation hot dry rock reservoir permeability increasing simulation experiment system and experiment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111470121.9A CN114152554B (en) | 2021-12-03 | 2021-12-03 | Hydraulic shear stimulation hot dry rock reservoir permeability increasing simulation experiment system and experiment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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