CN113686693B - Rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system - Google Patents

Rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system Download PDF

Info

Publication number
CN113686693B
CN113686693B CN202110978856.6A CN202110978856A CN113686693B CN 113686693 B CN113686693 B CN 113686693B CN 202110978856 A CN202110978856 A CN 202110978856A CN 113686693 B CN113686693 B CN 113686693B
Authority
CN
China
Prior art keywords
plate
pressing plate
pressure
loader
sample
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110978856.6A
Other languages
Chinese (zh)
Other versions
CN113686693A (en
Inventor
刘造保
王凯旋
冯涛
朱宝全
王川
吴名
徐建宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northeastern University China
Original Assignee
Northeastern University China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northeastern University China filed Critical Northeastern University China
Priority to CN202110978856.6A priority Critical patent/CN113686693B/en
Publication of CN113686693A publication Critical patent/CN113686693A/en
Application granted granted Critical
Publication of CN113686693B publication Critical patent/CN113686693B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/18—Performing tests at high or low temperatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/005—Electromagnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0067—Fracture or rupture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/023—Pressure
    • G01N2203/0232—High pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/025—Geometry of the test
    • G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0694—Temperature
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fluid Mechanics (AREA)
  • Dispersion Chemistry (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention provides a rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system, which is characterized in that: the device comprises a main stress loader, a host frame, a high-temperature heating box, a sample clamp, a working platform, a servo high-pressure pump and a high-pressure pulse motor; the sample clamp is used for clamping a rock sample; the high-temperature heating box is arranged in the main machine frame and is used for high-temperature loading and heat preservation of rock samples in the sample clamp; the main stress loader provides true three-way stress for a rock sample in the sample clamp through the force measuring assembly and the pressure head assembly; the sample clamp is assembled by pressing plates, and the pressing plates comprise conventional pressing plates for joint fracturing and geothermal injection and production and seepage pressing plates for seepage simulation tests; and a servo high-pressure pump and a high-pressure pulse motor are arranged below a working platform of the test system. The invention provides a new test and research means for the joint fracturing of the rock under the high temperature true three-dimensional, geothermal injection and extraction and the anisotropic seepage characteristic of the rock sample.

Description

Rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system
Technical Field
The invention belongs to the technical field of rock mechanics and engineering, and particularly relates to a rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system.
Background
In recent years, geothermal resources have been receiving wide attention from various countries as a clean renewable energy source with a huge reserve. And hot dry rock, which is representative of high-temperature geothermal resources, has been attempted to be developed and used for power generation since the last 70 th century. The development of hot dry rock is generally carried out by hydraulic fracturing at a deep reservoir through drilling to form a fracture network. Then injection and production are carried out, and heat extraction is carried out through fluid flow. Therefore, the development of the hot dry rock relates to hydraulic fracturing, water injection and heat recovery and seepage processes.
However, in the development of hot dry rocks all over the world at present, the problems that the hydraulic fracturing efficiency is low and the fracturing fracture is difficult to generate directionally exist. In the research of exploitation of the hot dry rock, a numerical simulation means is limited at present, and an indoor test for simulating fracture thermal storage injection exploitation under a real high-temperature and high-pressure environment is lacked. In hot dry rock development, hydraulic fracturing tests help to reveal the fracture initiation mechanism and law. And the simulation of fracture thermal storage injection and production tests and seepage tests in a real environment is helpful for exploring key influence factors in the process of geothermal exploitation.
For this reason, some units developed hydraulic fracturing equipment, such as "coal rock hydraulic fracturing test method in true three-way state (CN 102735547A)" of the university of Chongqing, wuhan rock and soil mechanics institute of Chinese academy of sciences, "a true three-way pressure device (CN102621000A) capable of realizing hydraulic fracturing test", and "true three-way hydraulic fracturing test device and hydraulic fracturing test method (CN 111257129A)" of the university of Chongqing. However, the above devices are all used for performing single hydraulic fracturing on rock samples at medium and low temperature (<150 ℃). And the traditional hydraulic fracturing has low efficiency and is difficult to control the direction. Therefore, the existing equipment and method lack the combined fracturing technology and are difficult to meet the engineering and research requirements. The research about geothermal exploitation is limited to numerical simulation at present, and fracture thermal storage injection and production tests and equipment under a simulated real environment are not shown. For the three-way seepage of a large sample, the prior art has the defects of difficult sealing and inaccurate deformation measurement.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system which can carry out combined fracturing tests of liquid nitrogen cold shock fracturing, high-pressure pulse fracturing and hydraulic fracturing on a rock sample under the conditions of high temperature, high pressure and three-dimensional direction. And the geothermal injection and production test under the real environment can be carried out through the fractured rock sample or the prefabricated fracture similar material sample. Meanwhile, according to the invention and the deformation thereof, a three-way seepage test can be carried out on a large rock sample. The method provides a research means for researching the directional crack initiation mechanism and rule of the rock under the high-temperature high-pressure true three-dimensional condition, provides a new test method for researching geothermal injection and production and researching the seepage anisotropy of the rock, and makes up for the deficiency of numerical simulation research.
The technical scheme adopted by the invention for solving the technical problems is that the rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system comprises a main stress loader, a main frame, a high-temperature heating box, a sample clamp, a working platform, a servo high-pressure pump and a high-pressure pulse motor; the sample clamp is used for clamping a rock sample; the high-temperature heating box is arranged in the main frame and is used for high-temperature loading and heat preservation of a rock sample in the sample clamp; the main stress loader provides true three-way stress for a rock sample in the sample clamp through the force measuring assembly and the pressure head assembly; the sample clamp is assembled by pressing plates, the pressing plates comprise conventional pressing plates for joint fracturing and geothermal injection and seepage pressing plates for seepage simulation tests, a servo high-pressure pump and a high-voltage pulse motor are arranged below a working platform of the test system, and the servo high-pressure pump and the high-voltage pulse motor are used for providing high-pressure water, liquid nitrogen and high-voltage pulse current when the joint fracturing test is carried out on a rock sample.
Further, the principal stress loader consists of σ1Directional loader, σ2Directional loader, σ3A direction loader; the sigma1The direction loader comprises a first sigma1Direction loader, second sigma1The direction loader and the direction loader are horizontally and symmetrically arranged and are respectively and fixedly arranged on the left side and the right side of the host frame; the sigma2The direction loader comprises a first sigma2Direction loader, second sigma2A direction loader arranged horizontally, wherein the first sigma2The direction loader is detachably arranged right in front of the host frame, and the second sigma2The direction loader is fixedly arranged on the main bodyRight behind the machine frame; the sigma3The direction loader comprises a first sigma3Direction loader, second sigma3A directional loader of which the first sigma3The direction loader is fixed above the main frame and the second sigma is3The direction loader is fixedly arranged at the inner lower part of the test system through a loader reaction frame and a transverse rigid plate.
Further, a guide rail is arranged on a working platform of the test system, and the first sigma is2The lower part of the direction loader is provided with a pulley with a first sigma2After the direction loader is disassembled, the first sigma can be driven by the motor2The direction loader moves along the guide rail of the working plane, the test system further comprises a sample crane arranged on one side of the working platform, the sample crane can move through the guide rail, the rock sample can be taken out of or sent into the high-temperature heating box through the mechanical arm before and after the test, and the tail end of the guide rail is provided with a limiting block.
Furthermore, the high-temperature heating box is fixedly arranged in a loading bin of the test system formed by the main machine frame and comprises a heating box front box plate and a heating box main box body, the heating box main box body is formed by fixedly arranging five box plates at the upper, lower, left, right and rear sides, the heating box front box plate is packaged with the heating box main box body through a buckle lock, and rectangular through holes are formed in the six box plates at the upper, lower, left, right, front and rear sides of the high-temperature heating box and used for penetrating of a pressure head assembly; the acoustic emission probe that passes the heating cabinet box is equipped with on the high temperature heating cabinet box, the high temperature heating cabinet outside is equipped with the cooling ring canal for the cooling protection of high temperature heating cabinet exterior structure.
Further, be equipped with high temperature resistant annular rubber sleeve on the briquetting of pressure head subassembly, the hole is buried underground to the inside a plurality of "L" type pipelines that are used for connecting servo high-pressure pump and high-voltage pulse motor's last pressure head in the pressure head of pressure head subassembly, the hole is buried underground respectively to be used for burying underground high pressure water/liquid nitrogen pipe, notes, outlet pipe to and high-voltage pulse electrode interface, high pressure water/liquid nitrogen pipe, water injection pipe and outlet pipe are the spiral setting in vertical direction, have compression resilience ability.
Further, the air conditioner is provided with a fan,the sample holder has a pressure plate comprising sigma3Direction press plate, σ3Direction hold-down plate, σ1Left directional pressure plate, sigma1Direction right press plate, σ2Direction front press plate, σ2A rear directional pressure plate; the sigma1A sigma is arranged in the left/right pressure plate2Direction LVDT sensor through hole, σ2Is internally provided with a sigma in the front/rear pressure plate1Directional LVDT sensor through-hole, σ3The pressing plate in the direction is provided with a packer through hole for penetrating out of the packer and the high-voltage pulse electrode circuit, sigma3The center of the direction lower press plate is provided with a positioning bolt hole.
Further, σ is3Directional platen and σ3The direction lower pressing plate is in a double-layer step shape, the inner surface of the direction lower pressing plate contacting the rock sample and the outer surface of the direction lower pressing plate contacting the pressure head are both rectangular, the middle layer surface is a concentric rectangular step surface, and the middle layer surface comprises a middle plane and an arc curved surface for transitionally connecting the middle plane and the inner surface; the sigma3Directional platen and σ3The length and the width of the inner surface of the pressing plate in the direction are respectively less than the length and the width of the rock sample by 10 mm; the sigma3Directional platen and σ3The length of the outer surface of the pressure plate contacting the pressure head in the direction is equal to the length of the rock sample + sigma1Full thickness of left press plate + sigma1The square right pressing plate is full thick, and the width of the square right pressing plate is equal to the width of the rock sample + sigma2Full thickness of front pressing plate + sigma2The direction back pressing plate is full thick;
the sigma2Front press plate and sigma2The inner surface of the pressure plate contacting the rock sample is rectangular, the length and the width of the inner surface are respectively less than the length and the height of the rock sample by 10mm, and the sigma is2Directional front press plate and sigma2The outer surface of the rear pressure plate contacting the pressure head in the direction is rectangular, the length of the outer surface is 10mm less than the length of the rock sample, and the height of the outer surface is equal to the height of the rock sample plus sigma3Total thickness of upper press plate + sigma3Full thickness-sigma of direction lower pressing plate3 Directional press plate 3101 has rectangular side thickness- σ3The rectangular side of the direction lower platen 3102 is-10 mm thick; the sigma2Directional front press plate and sigma2The upper and lower side surfaces of the directional rear pressing plate are provided with a rectangle with a width dThe inner surface of the pressing plate is in transition connection with the upper side and the lower side through arc curved surfaces;
the sigma1Left directional platen and σ1Shape, arrangement and sigma of right pressing plate2Directional front press plate and sigma2The direction back pressure plate sets up the same, and clamp plate length is for being less than rock sample width 10 mm.
Further, the σ1Left directional pressure plate, σ1Direction right press plate, σ2Directional front press plate and sigma2The side surface of the direction back pressing plate is detachably provided with a T-shaped pressing plate slide rail, and the sigma is3Directional platen and σ3The side surfaces of the direction lower pressing plates are provided with pressing plate slideways corresponding to the sliding rails; the length of the pressing plate slide rail is equal to the width d of a rectangular plane on the upper side and the lower side of the four pressing plates, namely the front pressing plate, the rear pressing plate, the left pressing plate and the right pressing plate;
the sigma1Left directional pressure plate, σ1Direction right press plate, σ2Directional front press plate and sigma2Lower side surface and sigma of direction rear press plate3The lower press plates are directly contacted and pressed, and the upper side surfaces of the front, the rear, the left and the right press plates and the sigma are3The interval of 10mm is reserved on the pressing plate in the direction, and the height of the pressing plate slide way is greater than that of the pressing plate slide way; the sigma1Left directional pressure plate, σ1Direction right press plate, σ2Directional front press plate and sigma2The width d of the upper rectangular side and the lower rectangular side of the directional rear pressing plate is less than sigma3Directional platen and σ3The width difference of the middle plane of the direction lower pressing plate D is 5mm (delta D-D).
Further, σ1、σ2The direction LVDT deformation sensors are embedded into corresponding LVDT sensor through holes, and two ends of each LVDT deformation sensor are fixed on adjacent pressing plates through L-shaped sensor supports; sigma3The directional LVDT deformation sensor is arranged in a right-angle blank area of the sample clamp and is fixed on the sigma through an L-shaped sensor bracket3Directional platen and σ3The direction is lower than the pressing plate.
Furthermore, in the conventional pressing plate, except for the upper pressing plate provided with the packer through hole, the other pressing plates are all solid pressing plates; the seepage pressure plate comprises a pressure plate body and a flow guide plate, wherein a rectangular groove is formed in the inner surface of the pressure plate body, the flow guide plate is embedded in the rectangular groove of the pressure plate in a sleeved mode, and a water inlet and outlet hole passage and a vertical water hole connected with the water inlet and outlet hole passage are formed in the pressure plate body below the rectangular groove; the upper surface of the guide plate is carved with a transverse guide groove and a longitudinal guide groove, and the cross position of the guide groove is provided with an seepage hole penetrating through the guide plate; when the seepage simulation test is carried out, the pressure plates corresponding to the set inlet and outlet flow directions can be set to be seepage pressure plates with the same size, and the other pressure plates are solid pressure plates.
Furthermore, the seepage press plate can be used as a solid press plate after the guide plate in the seepage press plate is replaced by a solid plate with the same size.
Furthermore, during the test, the exposed corners of the rock sample between the pressing plates are coated with the sealant so as to achieve the purpose of completely sealing the rock sample.
The invention also provides a simulation test method for rock deep combined fracturing, geothermal injection and production and seepage, which is based on the test system to carry out combined fracturing test, geothermal injection and production test or anisotropic seepage test.
The rock sample was placed horizontally in the long axis direction. The rock sample has a maximum principal stress sigma in the horizontal long axis (left and right) direction1Direction, horizontal front-to-back direction, being the median principal stress σ2Direction, vertical direction, being the minimum principal stress σ3And (4) direction. The rock sample needs to be treated before being tested, and the concrete steps are as follows:
(1) drilling a hole in the center of the upper end surface of the rock sample along the vertical direction to the center height of the rock sample, plugging a packer, sealing gaps between the packer and the periphery of the drilled hole by using sealant, and simultaneously treating the redundant sealant exceeding the range of a through hole of the packer of the sample clamp;
(2) drilling small-diameter drill holes in the positions, close to the left side and the right side, of the upper end face axis of the rock sample along the vertical direction until the center height of the rock sample, and respectively plugging high-voltage pulse electrodes into the small holes and sealing and fixing the high-voltage pulse electrodes;
(3) drilling a small drill hole with the depth of 35mm and the diameter of less than 3mm at a position, close to the right side, on the front side surface of the rock sample, fixing a thermocouple temperature sensor into the drill hole, and forming a horizontal narrow groove rightwards from the thermocouple drill hole position on the surface of the sample; fixing the line of the thermocouple temperature sensor into the horizontal narrow groove, and ensuring that the line of the thermocouple temperature sensor does not protrude out of the surface of the rock sample;
(4) installing a sample clamp, selecting a temporary fastener of the installation clamp according to test requirements, and coating high-temperature-resistant glue on exposed corners of the rock sample for sealing and air-drying;
(5) temporary fastening piece for dismounting sample clamp during installation, and sigma is installed according to test requirements1，σ2And σ3Directional LVDT deformation sensor.
The rock deep combined fracturing, geothermal injection and production and seepage simulation test system can realize the following test functions:
(1) and carrying out combined fracturing test on the large rock sample under the conditions of high temperature, high pressure and true three-dimensional stress (the maximum temperature is 400 ℃, the maximum three-dimensional rated loading force is 100 MPa).
(2) The simulation test of geothermal injection and production under the real warm-pressing condition can be carried out through a fractured rock sample or a prefabricated fracture similar material sample.
(3) According to the sample clamp and the deformation thereof, three-dimensional (X direction, Y direction, Z direction or any inlet and outlet path) permeability test can be carried out on a large sample under high-temperature true three-dimensional stress.
(4) The stress and the real deformation of the sample can be accurately measured in the experimental process, and particularly, the contradiction between the sealing and deformation measurement accuracy of the large rock sample in the prior art is made up.
According to the invention, the cracking mechanism and the cracking rule of the rock under the high-temperature true three-dimensional stress condition can be revealed, and a new test means is provided for geothermal injection and production simulation and anisotropic seepage research of large samples.
Drawings
FIG. 1 is a longitudinal plane view of a test system of the present invention;
FIG. 2 shows the first σ of the present invention2The direction loader moves the top view of the test system in the front (1) and the back (2);
FIG. 3 is a side view in the direction X of the testing system of the present invention;
FIG. 4 is a cross-sectional view of a testing system of the present invention;
FIG. 5 is an enlarged view of the heating chamber of the present invention;
FIG. 6 is a three-dimensional perspective view of the cover plate of the heating chamber of the present invention;
FIG. 7 is an enlarged view of a portion of the heating chamber of the present invention at I;
FIG. 8 is a view showing the internal structure of the heating chamber when the indenter of the present invention is not in contact with the jig;
FIG. 9 is a diagram of a rock sample pipeline installation for a combined fracture test of the present invention;
FIG. 10 is an enlarged view of the internal structure of the upper ram of the present invention;
FIG. 11 is a view of piping arrangement during injection-production simulation test according to the present invention;
FIG. 12 is a pre-fabricated fracture-containing specimen of a geothermal injection-production experiment of the present invention;
FIG. 13 is a three-dimensional block diagram of a sample holder of the present invention;
FIG. 14 shows σ in accordance with the present invention2Partial enlarged view of structure at II position of front pressing plate
FIG. 15 is a three dimensional oblique view of a sample holder after installation of an LVDT sensor of the present invention;
FIG. 16 is a cross-sectional view of a sample holder of the present invention;
FIG. 17 is a longitudinal cross-sectional view of a sample holder of the present invention;
FIG. 18 is a three-dimensional view of a sample holder pressing plate having a seepage function according to the present invention (expressed as σ)3Lower platen for example);
FIG. 19 is a longitudinal section view (at σ) of a sample holder with percolation function according to the present invention3Lower platen for example);
in the figure: 101-first σ1Directional loader, 102-second σ1Directional loader, 201-first σ2Directional loader, 202-second σ2Directional loader, 301-first σ3Directional loader, 302-second σ3A directional loader, 4-a main frame, 5-a loader counter-force frame, 6-a pulley, 7-a loader base, 8-a transverse rigid plate, 9-a high-temperature heating box, 901-a heating plate,902-a heat preservation and insulation board, 903-an outer wrapping steel plate, 904-a heating box front box plate, 905-a lock catch, 906-a heating box main box body, 10-an acoustic emission probe, 11-a pressure head, 12-a heat insulation pad, 13-a pressing block, 14-a force measuring sensor pressure head, 15-a force measuring sensor, 16-an annular rubber sleeve, 17-a loading bin, 18-a cooling ring pipe, 19-a working platform, 20-a guide rail, 21-a sample crane, 22-a rock sample, 23-a limiting block, 24-a gas-liquid bin, 25-a servo high-pressure pump, 26-a high-pressure pulse motor, 27-a packer, 28-a high-pressure pulse electrode, 29-a thermocouple temperature sensor, 30-a horizontal narrow groove, 31-a sample clamp and 3101-sigma.3Direction Upper pressure plate, 3102-sigma3Direction lower press plate, 3103-sigma1Left directional pressure plate, 3104-sigma1Right pressing plate, 3105-sigma2Direction front pressure plate, 3106-sigma2Direction Back pressure plate, 3107-packer through hole, 3108-sigma2Direction LVDT sensor Via, 3109- σ1Through holes of a direction LVDT sensor, 3110 positioning bolt holes, 3111 pressing plate slide rails, 3112 pressing plate slide ways, 3113 fastening screws, 3114 guiding plates, 3115 guiding grooves, 3116 seepage holes, 3117 vertical water holes, 3118 water inlet and outlet channels, 32 pipeline embedding holes, 33 high-pressure water/liquid nitrogen pipes, 34 water injection pipes, 35 water outlet pipes, 36 high-pressure pulse electrode interfaces, 3701-sigma1Direction LVDT deformation sensor, 3702-sigma2Direction LVDT deformation sensor, 3703-sigma3Direction LVDT deformation sensor, 38-sensor mount.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Examples
As shown in fig. 1 to 19, the rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system comprises a main stress loader, a host frame 4, a high-temperature heating box 9, a sample clamp 31, a working platform 19, a servo high-pressure pump 25 and a high-pressure pulse motor 26, wherein the sample clamp 31 is used for clamping a rock sample 22; the high-temperature heating box 9 is arranged in the main frame 4 and is used for high-temperature loading and heat preservation of the rock sample 22 in the sample clamp 31; the primary stress loader is used to provide true triaxial stress to the rock sample 22; the sample clamp 31 is assembled by pressing plates, and the pressing plates comprise a conventional pressing plate for joint fracturing and geothermal injection and production and a seepage pressing plate for a seepage simulation test; a servo high-pressure pump 25 and a high-voltage pulse motor 26 are arranged below a working platform 19 of the test system, and the servo high-pressure pump 25 and the high-voltage pulse motor 26 are used for providing high-pressure water, liquid nitrogen and high-voltage pulse current when performing a combined fracturing test on a rock sample.
As shown in fig. 1-4, the principal stress loader consists of1Directional loader, σ2Directional loader, σ3A direction loader; the sigma1The direction loader comprises a first sigma1Direction loader 101, second σ1The directional loader 102 is horizontally and symmetrically arranged and fixedly arranged on the left side and the right side of the host frame through a loader reaction frame 5 and a loader base 7 respectively; the sigma2The directional loader comprises a first sigma2Direction loader 201, second σ2A direction loader 201, arranged horizontally, with a first σ2The direction loader is fixedly arranged in the loader reaction frame, is arranged right in front of the main frame and can be separated from the main frame through a fastener, and the second sigma is2The direction loader is fixedly arranged right behind the host frame through a loader reaction frame 5 and a loader base 7; the sigma3The direction loader comprises a first sigma3Directional loader 301, second σ3Directional loaders 302, both arranged in vertical symmetry, with a first σ3The direction loader is fixed above the main frame and the second sigma is3The direction loader is fixedly arranged at the inner lower part of the test system through a loader reaction frame 5 and a transverse rigid plate 8; at time of loading, σ1Directional loader, σ2Directional loader and sigma3The direction loaders all maintain synchronous loading.
The main frame 4 is of a square structure, the upper surface, the lower surface, the left surface and the right surface are of an integrated rigid structure, and the loader reaction frame 5 is of a U-shaped structure and provides reaction force for the main stress loader during stress loading.
The working platform 19 of the test system is provided with a guide rail 20, and the first sigma is2The lower part of the reaction frame of the direction loader is provided with a pulley 6, a first sigma2After the direction loader 201 is disassembled, the first sigma can be driven by the motor2The direction loader moves to 19 one end of work platform along work plane's guide rail 20, test system is still including setting up the sample hoist 21 in work platform one side, sample hoist 21 accessible guide rail 19 removes, can take out rock sample 22 from high temperature heating case 9 or send into in high temperature heating case 9 through the arm around experimental, 20 end of guide rail is provided with stopper 23 to prevent sample hoist 21 and first sigma2The direction loader 201 moves excessively, a gas-liquid cabin 24 is arranged below the working platform 19, a servo high-pressure pump 25, a high-voltage pulse motor 26 and other devices required by experiments can be arranged in the gas-liquid cabin, and the servo high-pressure pump 25 and the high-voltage pulse motor 26 are used for providing high-pressure water, liquid nitrogen and high-voltage pulse current when hydraulic fracturing, liquid nitrogen cold shock fracturing and high-voltage pulse fracturing tests are carried out on the rock sample 22.
The pressure head assembly consists of a pressure head 11, a heat insulation pad 12 and a pressing block 13, the force measuring assembly connected with the pressure head assembly consists of a force measuring sensor pressure head 14 and a force measuring sensor 15, in the test process, the pressure head assembly sequentially penetrates into the high-temperature heating box 9 and contacts with the sample clamp 31, the shape of the pressure head assembly is rectangular, the pressure head 14 and the force cell 15 of the force cell sensor on one side of the pressure head assembly are both cylindrical structures, each pressing block 13 is sleeved with a high-temperature resistant annular rubber sleeve 16, after the stress loading, the annular rubber sleeve 16 extrudes the gap between the through hole of the high-temperature heating box 9 and the pressing block 13 which are positioned outside, thereby effectively preventing heat leakage, the positions of the annular rubber sleeve 16 and the pressing block 13 are not fixedly arranged, only slightly larger elastic fastening force is kept, when the extrusion force of the annular rubber sleeve 16 and the high-temperature heating box 9 is overlarge during loading, the annular rubber sleeve can slide backwards to a certain degree, and the stress loading precision is ensured.
As shown in fig. 4, 5, 6, and 7, the high temperature heating box 9 is fixedly installed inside a test system loading bin 17 formed by the host frame 4, the high temperature heating box 9 is a cuboid, and includes a heating box front box plate 904 and a heating box main box 906, the heating box main box 906 is fixedly installed by five box plates, namely, an upper box plate, a lower box plate, a left box plate, a right box plate, a left box plate, a right box plate, a front box plate, a right box plate, a front plate, a right box plate, a left box, a right box, a; the left and right side box plates of the high-temperature heating box 9 are provided with 8-channel sound emission interfaces, and the sound emission probes 10 penetrate through the box body of the heating box;
every boxboard structure is by interior and outer hot plate 901, heat preservation heat insulating board 902 and outsourcing steel sheet 903 constitution in proper order, and the inside heating resistor circle that sets up of hot plate 901, heat preservation heat insulating board 902 are made by the effectual high temperature resistant material that keeps warm, and outsourcing steel sheet 903 then is used for protecting high temperature heating box 9, and high temperature heating box 9 passes through the quick encapsulation of padlock 905, can reach good sealed effect when having simplified the encapsulation step. During the test, the heating plate 901 is started through the servo temperature control system to heat and preserve heat of the rock test piece 22 in the high-temperature heating box 9.
And a cooling ring pipe 18 is fixedly arranged at the outer side of the high-temperature heating box 9 and in the loading bin 17, the cooling ring pipe 17 is a hollow pipe, and is annularly wound outside the pressure head assembly and the force measuring assembly. In the high temperature fracturing test, a cryogenic fluid is driven to circulate in the cooling loop 17 by a refrigerator. The cooling and protection of the external device of the high-temperature heating box 9 are realized, and the influence of the temperature on the stress measurement precision of the force measuring sensor 15 and the servo loading system is reduced. In addition, the loading bin 17 of the test system is not a sealing structure, the outdoor environment can be fully utilized for cooling protection, and the heat concentration of the loading bin 17 caused by heat leakage of the high-temperature heating box 9 is reduced.
As shown in fig. 8, 9 and 10, 3 "L" type pipeline embedding holes 32 are arranged in the pressure head 11 right above the rock sample 22, the pipeline embedding hole 32 on the right side of the upper pressure head 11 is communicated with the pipeline embedding hole 32 in the middle in the horizontal direction, the pipeline embedding hole 32 in the middle of the upper pressure head 11 is provided with a high-pressure water/liquid nitrogen pipe 33, the high-pressure water/liquid nitrogen pipe 33 is used for conveying high-pressure water and liquid nitrogen fluid during hydraulic fracturing and liquid nitrogen cold shock fracturing, the pipeline embedding holes on the left side and the right side of the upper pressure head 11 are respectively embedded with a water injection pipe 34, a water outlet pipe 35 and a high-pressure pulse electrode interface 36. The water injection pipe 34 and the water outlet pipe 35 are connected with the packer 27 inside the rock sample 22 and used for water injection and water pumping in the geothermal injection and production simulation test. The high-voltage pulse electrode interface 36 is used for connecting the positive and negative high-voltage pulse electrodes 28 in the rock sample 22, so that the high-voltage pulse current is directly radiated in the rock sample 22 for pre-cracking. The high-pressure water/liquid nitrogen pipe 33, the water injection pipe 34 and the water outlet pipe 35 are spirally arranged in the vertical direction, and have certain elasticity and compressibility. When the indenter 11 is not in contact with the sample holder 31, the natural length of each pipe extends out of the pipe burying hole 32. Vertical loading may be performed after each tubing is connected to packer 27. At this time, the upper ram 11 is pressed against the sample holder 31, and the spiral pipe is completely compressed into the pipe burying hole 32.
As shown in fig. 13, 14 and 15, as a modification of the above-mentioned solution, the pressing plate of the sample holder 31 includes σ3Directional upper press plate 3101, σ3 Direction press plate 3102, σ1 Left pressing plate 3103, σ1Right pressing plate 3104, σ2 Front press plate 3105, σ in the direction2A direction rear pressing plate 3106; the sigma1 Left press plate 3103 and σ2Sigma is provided in the direction rear press plate 31062Direction LVDT sensor vias 3108 and σ1Directional LVDT sensor throughbore 3109 for measuring rock specimen 22 at σ2Sum of directions σ1Deformation of direction (i.e.. epsilon.)2And epsilon1). The sigma3The direction pressing plate 3101 is provided with a packer through hole 3107, and the packer through hole 3107 is used for the penetration of the line between the packer 27 and the high-voltage pulse electrode 28, sigma3The center of the pressing plate 3102 is provided with a positioning bolt hole 3110, which is convenient for mounting and positioning the rock sample 22 in the test process.
As shown in fig. 16 and 17, as an improvement of the technical solution, the σ is3Direction press plates 3101 and σ3The direction lower pressing plate 3102 is in a double-layer step shape, the inner surface of the direction lower pressing plate contacting the rock sample 22 and the outer surface of the direction lower pressing plate contacting the pressing head 11 are both rectangular, the middle layer surface is a concentric rectangular step surface, and the middle layer surface comprises a middle plane and an arc curved surface for transitionally connecting the middle plane and the inner surface; the sigma3Direction press plates 3101 and σ3The length and width of the inner surface of the lower directional pressure plate 3102 are both 10mm less than the length and width of the rock sample 22, respectively, and this arrangement ensures that the relative displacement of the lateral pressure plates around the sample clamp 31 when pressed is greater than the maximum deformation epsilon of the rock sample 22 in the length direction1And maximum deformation amount epsilon in width direction2(ii) a The sigma3Direction press plates 3101 and σ3The length of the outer surface of the downward pressing plate 3102 contacting the indenter 11 is equal to the length of the rock sample 22 + σ1Directional left press plate 3103 full thickness + σ1Right pressing plate 3104 is full thick, having a width equal to width + σ of rock sample 222Front pressing plate 3105 full thickness + σ2The rear platen 3106 is full thick.
The sigma2Direction front pressure plate 3105 and σ2The inner surface of directional rear platen 3106 contacting rock specimen 22 is rectangular, with both the length and width of the inner surface being less than 10mm, σ, the length and height of rock specimen 22, respectively2Direction Forward pressure plates 3105 and σ2The outer surface of the directional rear press plate 3106 contacting the indenter 11 is rectangular, and has a length less than 10mm of the rock sample length, and a height of + σ + the height of the rock sample 223Directional upper press plate 3101 full thickness + sigma3Direction lower press plate 3102 full thickness- σ3 Directional press plate 3101 has rectangular side thickness- σ3The rectangular side of the direction lower platen 3102 is-10 mm thick; the sigma2Direction front pressure plate 3105 and σ2The rear pressing plate 3106 has a rectangular plane with a width d on the upper and lower side surfaces, and the inner surface of the pressing plate is transitionally connected to the upper and lower side surfaces through an arc curved surface.
The sigma1Direction left press plate 3103 and σ1Right pressing plate 3104, shape and arrangement thereof, and σ2Direction front pressure plate 3105 and σ2The orientation back pressure plate 3106 is set the same and the pressure plate length is 10mm less than the width of the rock sample 22.
As shown in FIGS. 13 to 17, the σ represents an improvement of the present invention1Left pressing plate 3103, σ1Right pressing plate 3104, σ2Direction front pressure plate 3105 and σ2The side surfaces of the directional rear platen 3106 are all provided with "T" -shaped platen slide rails 3111, σ3Directional upper press plate 3101 and σ3All be provided with on the side of direction holding down plate 3102 with the corresponding clamp plate slide 3112 of slide rail, sigma1Left pressing plate 3103, σ1Right pressing plate 3104, σ2Direction front pressure plate 3105 and σ2The directionally rear platen 3106 passes through the "T" shaped platen slide 3111 and σ3Direction press plates 3101 and σ3A direction lower pressing plate 3102; the length of the pressure plate slide rail 3111 is equal to the width d of the rectangular plane of the upper and lower side surfaces of the front, rear, left and right pressure plates, the pressure plate slide rail 3111 is fixedly arranged on the upper and lower rectangular side surfaces of the front, rear, left and right pressure plates 3103-3106 through fastening screws 3113, and when the rock sample 22 is deformed under pressure, the front, rear, left and right pressure plates 3103-3106 move relatively by means of the pressure plate slide rail 3111 and the slide way 3112;
the sigma1Left directional pressing plate 3103, σ1Right pressing plate 3104, σ2Direction front pressure plate 3105 and σ2Lower side surface and σ of directional rear platen 31063The pressing plate 3102 is pressed by direct contact, and the upper side surfaces of the four pressing plates 3103-3106 are in contact with the pressure3The pressing plate 3101 is spaced apart by 10mm in the direction set to ensure σ3Direction press plates 3101 and σ3The relative movement of the direction pressing plate 3102 that can occur when pressed is larger than the maximum deformation epsilon of the rock specimen 22 in the height direction3(ii) a In addition, the height of the pressure plate slide rail 3112 is greater than the height of the pressure plate slide rail 3111, that is, a certain interval is left between the pressure plate slide rail 3111 and the pressure plate slide rail 3112, and the interval height difference is also used for ensuring the amount of relative movement of the upper and lower pressure plates 3101-3102 in the vertical direction when being pressed; the sigma1Left directional pressing plate 3103, σ1Right pressing plate 3104, σ2Direction front pressure plate 3105 and σ2The width d of the upper and lower rectangular side surfaces of the direction rear press plate 3106 is smaller than σ3Direction press plates 3101 and σ3The width D of the middle plane of the downward pressing plate 3102 is 5mm (Δ D is D-D), 2 times of the width is the maximum relative displacement of the four side pressing plates 3103-3106 in opposite directions when pressed, and this is also set to ensure σ1Left directional pressure plate, σ1Direction right press plate, σ2Directional front press plate and sigma2The relative movement of the back pressure plate which can be generated by pressing is larger than the maximum deformation epsilon of the rock sample 22 in the length direction1And maximum deformation in the width direction ∈2。
As shown in fig. 15 and 16, as a modification of the above-described embodiments, σ is1Direction LVDT deformation sensor 3701 buried to σ2σ of Directional Back pressure plate 31061Within direction LVDT sensor via 3109, σ1The direction LVDT deformation sensor 3701 is fixed by an "L" shaped sensor mount 38, the other end of the "L" shaped sensor 38 mount is fixed by a fastening screw 3113 to the adjacent two sides of the sigma1Direction left press plate 3103 and σ1A rear end surface of the right presser plate 3104. Similarly, σ2Direction LVDT deformation sensor 3702 buried to σ1σ of the directional left press plate 31032The direction LVDT sensor is also secured within the through hole 3108 by an "L" shaped sensor mount 38. And σ3Direction LVDT deformation sensor 3703 is fixed at σ by "L" shaped sensor mount 383 Direction press plates 3101 and σ3Is pressed downwards between the plates 3102 and is at σ2Direction front pressure plate 3105 and σ1Right-angled blank regions between the right pressing plates 3104. The other side of the "L" shaped sensor holder 38 is fixed to σ by a fastening screw 31133 Direction press plates 3101 and σ3A right end surface of the direction lower platen 3102.
As shown in fig. 18 and 19, as an improvement of the technical solution, in the conventional pressing plate, except for the upper pressing plate provided with the packer through hole, the other pressing plates are all solid pressing plates; the seepage pressure plate comprises a pressure plate body and a flow guide plate 3114, a rectangular groove is formed in the inner surface of the pressure plate body, the flow guide plate 3114 is embedded in the rectangular groove of the pressure plate in a sleeved mode, and a water inlet and outlet duct 3118 and a vertical water hole 3117 connected with the water inlet and outlet duct are formed in the pressure plate body below the rectangular groove; the upper surface of the guide plate is carved with a transverse guide groove 3115 and a longitudinal guide groove which is crossed with a seepage hole 3116 penetrating through the guide plate; when the seepage simulation test is carried out, the pressure plates corresponding to the set inlet and outlet flow directions can be set to be seepage pressure plates with the same size, and the other pressure plates are solid pressure plates.
The seepage press plate can be used as a solid press plate after the guide plate in the seepage press plate is replaced by a solid plate with the same size.
Sigma used in carrying out rock seepage tests3The directional upper pressure plate 3101 is not provided with a packer through hole 3107 in its structure, whether it is a seepage pressure plate on the water inlet and outlet side or not.
At σ3The direction lower pressing plate 3102 is taken as an example for illustration, a guide plate 3114 and a water inlet and outlet duct 3118 are introduced on a conventional solid pressing plate to form a seepage channel, a rectangular groove is formed in the center of the inner surface of the pressing plate contacting the rock sample 22, and the size of the guide plate 3114 is consistent with that of the rectangular groove; the upper surface of the guide plate 3114 is carved with a transverse guide groove 3115 and a longitudinal guide groove 3115, and a seepage hole 3116 penetrating through the guide plate 3114 is arranged at the crossing position of the guide groove 3115; similarly, a transverse and longitudinal diversion trench 3115 is carved on the surface of the pressing plate rectangular groove, and a vertical water hole 3117 with a slightly larger aperture is arranged in the middle of the pressing plate rectangular groove; a transverse water inlet and outlet duct 3118 is arranged in the pressure plate and used for connecting a vertical water hole 3117; the guide plate 3114 is embedded in the rectangular groove of the pressing plate in a sleeved mode during installation, and is fixedly installed with the pressing plate through a fastening screw 3113; thus, the water inlet/outlet passage 3118 is used for water injection or drainage, and the water inlet/outlet passage 3118 and the vertical water holes 3117, the seepage holes 3116 and the guide grooves 3115 form a seepage passage in the platen.
Note that when anisotropic seepage of the large rock sample 22 is performed, seepage tests are performed in three directions of X, Y, and Z or any inlet and outlet directions, respectively, and when a certain one-way seepage test is performed, two pressure plates on the water inlet side and the water outlet side need to be provided with seepage holes, and the rest of the pressure plates are kept as conventional solid pressure plates. At this time, the water inlet/outlet port 3118 of one of the two vadose platens serves as an inlet for injecting high pressure water, and the water inlet/outlet port 3118 of the other vadose platen serves as an outlet for discharging water, so that the vadose platen and the rock sample 22 form a vadose passage. In this case, the seepage characteristics of the rock sample 22 in this direction can be obtained.
In this embodiment, the rock sample 22 is a rectangular parallelepiped having a size of 400mm × 200mm × 200mm, and the rock sample 22 is placed horizontally in the long axis direction. The horizontal major axis (left-right) direction of the rock sample 22 is the maximum principal stressForce sigma1Direction, horizontal front-to-back direction, being the median principal stress σ2Direction, vertical direction, being the minimum principal stress σ3And (4) direction. The arrangement accords with the rule that two horizontal main stresses in a real ground stress environment are larger than a vertical main stress, so that the three-direction stress loading accords with the real ground stress environment better. The rock sample 22 needs to be processed before being tested, as shown in fig. 9, the specific steps are:
(1) drilling a hole in the center of the upper end face of the rock sample 22 along the vertical direction to the center height of the rock sample 22, plugging a packer 27, sealing gaps between the packer 27 and the periphery of the drilled hole by using sealant, and simultaneously treating the redundant sealant exceeding the range of a through hole 3107 of a packer of the sample clamp;
(2) drilling small-diameter drill holes in the positions, close to the left side and the right side, of the upper end face axis of the rock sample 22 along the vertical direction until the center height of the rock sample 22, and respectively plugging the high-voltage pulse electrodes 28 into the small holes for sealing and fixing;
(3) drilling a small drill hole with the depth of 35mm and the diameter of less than 3mm at a position, close to the right side, on the front side surface of the rock sample 22, fixing a thermocouple temperature sensor 29 into the drill hole, forming a horizontal narrow groove 30 towards the right from the thermocouple drill hole position on the surface of the sample, fixing a circuit of the thermocouple temperature sensor 29 into the horizontal narrow groove 30, and ensuring that the circuit of the thermocouple temperature sensor 29 does not protrude out of the surface of the rock sample 22;
(4) installing a sample clamp 31, selecting a temporary clamp fastener according to test requirements, coating high-temperature-resistant glue on exposed corners of the rock sample 22, sealing and air-drying;
(5) dismantling the temporary fastener when the sample clamp 31 is installed, and installing sigma according to the test requirement1，σ2And σ3Directional LVDT deformation sensor.
Test 1
A high-temperature true three-dimensional rock deep combined fracturing method adopts a rock deep combined fracturing, geothermal injection and production and seepage simulation test system, and comprises the following steps:
the method comprises the following steps: preparing a rock sample with the size of 400mm multiplied by 200mm, installing a packer in the middle of the sample, installing high-voltage pulse current radiation heads on two sides of the sample, and installing a thermocouple temperature probe on the front side surface of the sample;
step two: installing a sample clamp, and coating high-temperature-resistant sealant at the exposed corner of the rock sample to seal the sample;
step three: after the sample sealant is air-dried, a three-direction LVDT deformation sensor is installed;
step four: dismantle the first sigma2The direction loader moves to one side of the working platform through the guide rail;
step five: sigma for operating sample crane to convey sample into heating box through guide rail3Downwards pressing the head, and positioning the position of the rock sample through a positioning bolt;
step six: start-up sigma3Loading by directional displacement on the upper surface of the specimen holder and sigma3When the interval of the pressure heads in the direction reaches a set value, connecting the high-pressure water/liquid nitrogen pipe with the packer and connecting the high-pressure pulse current radiation head with the thermocouple temperature sensor;
step seven: after finishing gas-liquid pipeline, starting sigma1Sum of directions σ3Directional prestress loading is carried out, and the directional prestress loading is carried out to a preset prestress value;
step eight: packaging the heating box and fixedly mounting a first sigma2A direction loader;
step nine: start-up sigma2Directional prestress loading to make the sample sigma2The direction load reaches a pre-stress set value;
step ten: starting a refrigeration cooling system, starting temperature loading, and performing temperature servo loading under the control of a thermocouple temperature sensor to ensure that the temperature of the rock sample reaches a set value and is kept warm for a plurality of durations;
step eleven: start-up sigma1Direction, σ2Direction sum σ3Directional stress loading, and loading the stress to a test set value;
step twelve: and starting liquid nitrogen injection, and injecting liquid nitrogen fluid through a packer in the middle of the rock sample to realize liquid nitrogen cold impact pre-fracturing on the sample.
Step thirteen: starting high-voltage pulse discharge, and performing high-voltage pulse current pre-fracturing on the rock sample through high-voltage pulse current radiation heads on two sides of the rock sample.
Step thirteen: and after the liquid nitrogen cold shock and the high-voltage pulse current pre-fracturing are finished, starting hydraulic fracturing, and injecting high-pressure water through a packer in the middle of the rock sample until the rock is fractured.
Fourteen steps: and after the sample is cracked, stopping fracturing and temperature loading, unloading the stress in three directions when the temperature in the heating box is reduced to 70 ℃, and unloading and shifting to 0 mm.
Step fifteen: dismantle the first sigma2And (4) a direction loader, and taking out the tested rock sample by a sample crane.
Sixthly, the steps are as follows: and (5) exporting data and analyzing.
Test 2
A high-temperature true three-dimensional geothermal injection-production test method adopts a rock deep-ground combined fracturing, geothermal injection-production and seepage simulation test system, and comprises the following steps:
the method comprises the following steps: preparing a prefabricated fractured rock sample (figure 12) with the size of 400mm multiplied by 200mm, placing a plurality of metal foils with the thickness of 0.1mm in the middle of the fracture of the sample to control the opening degree of the fracture, then plugging the fracture outlet on the surface of the rock sample by cement mortar, and carrying out surface polishing after air drying.
Step two: drilling holes on two sides of the upper surface of the rock sample, and installing packers, and installing thermocouple temperature sensors at different positions and depths of the rock sample;
step three: mounting a sample clamp to form an assembly body, coating high-temperature-resistant sealant at the exposed corner of the rock sample to seal the sample, (a three-direction LVDT deformation sensor does not need to be mounted in a geothermal injection-production test);
step four: dismantle the first sigma2The direction loader moves to one side of the working platform through the guide rail;
step five: sigma for operating sample crane to convey sample into heating box through guide rail3Downwards pressing the head, and positioning the position of the rock sample through a positioning bolt;
step six: start-up sigma3Loading by directional displacement on the upper surface of the specimen holder and sigma3When the interval of the pressure heads in the direction reaches a set value, the connection between the water injection pipe and the packer, the connection mode of which is shown in figure 11, and the connection between the thermocouple temperature sensor are carried out;
step seven: after finishing gas-liquid pipeline, starting sigma1Sum of directions σ3Directional prestress loading is carried out, and the directional prestress loading is carried out to a preset prestress value;
step eight: packaging the heating box and fixedly mounting a first sigma2A direction loader;
step nine: start-up sigma2Directional prestress loading to make the sample sigma2The direction load reaches the pre-stress set value;
step ten: starting a refrigeration cooling system, starting temperature loading, and carrying out temperature servo loading under the control of a thermocouple temperature sensor to ensure that the temperature of the rock sample reaches a set value and keep the temperature for a plurality of time;
step eleven: start-up sigma1Direction, σ2Sum of directions σ3Directional stress loading, and loading the stress to a test set value;
step twelve: recording an instant heat flow value (current value) output by a temperature control system in a heat preservation time period when the rock sample reaches a set temperature value, wherein the instant heat flow value in the heat preservation stage is used as heat compensation of the rock sample of the injection and mining test;
step thirteen: changing the temperature control mode into loading of a heat flow value (current value), and inputting records of the heat flow value and time in the heat preservation stage as a heat compensation control instruction;
fourteen steps: and starting the servo high-pressure pump to perform water injection and pumping in a constant-pressure or constant-flow mode, and recording data such as sample temperature, output liquid temperature, inlet and outlet pressure, flow and the like.
Note that the duration of the injection and production test should not exceed the duration of the heat flow data input in step thirteen.
Step fifteen: and stopping injection and production and temperature loading after the preset injection and production time is reached, unloading the three-directional stress when the temperature in the heating box is reduced to 70 ℃, and unloading and shifting to 0 mm.
Sixthly, the steps are as follows: dismantle the first sigma2And (4) a direction loader, and taking out the tested rock sample by a sample crane.
Seventeen steps: and (5) exporting records, and analyzing and processing test data.
Test 3
A seepage anisotropy test of a large sample under a high-temperature true three-dimensional condition adopts a rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system, and comprises the following steps:
the method comprises the following steps: preparing a rock sample with the size of 400mm multiplied by 200mm, and installing a thermocouple temperature sensor on the surface of the rock sample;
step two: mounting a sample clamp to clamp1Left directional platen and σ1Changing the direction to the right pressing plate into a pressing plate with a seepage function, keeping the rest pressing plates to be conventional solid pressing plates, and coating high-temperature-resistant sealant at the exposed corners of the rock sample to seal the sample after the sample clamp is installed;
step three: after the sealant is air-dried, mounting a three-direction LVDT deformation sensor on the sample clamp to form a rock sample assembly body;
step four: dismantle the first sigma2The direction loader moves to one side of the working platform through the guide rail;
step five: operating the sample crane to feed the sample assembly into the heating chamber via the guide rail3Downwards pressing the head, and positioning the position of the rock sample through a positioning bolt;
step six: start-up sigma1Sum of directions σ3Directional prestress loading is carried out, and the directional prestress loading is carried out to a preset prestress value;
step seven: connecting thermocouple temperature sensor, and measuring sigma1The water inlet and outlet pore passages of the left pressing plate are used as injection ports to inject sigma1A water inlet and outlet pore passage which is oriented to the right pressing plate is used as a water extraction port and is respectively connected with a servo high-pressure pump;
step eight: packaging the heating box and fixedly mounting a first sigma2A direction loader;
step nine: start-up sigma2Directional prestress loading to make the sample sigma2The direction load reaches the pre-stress set value;
step ten: starting a refrigeration cooling system, starting temperature loading, and performing temperature servo loading under the control of a thermocouple temperature sensor to enable the temperature of the rock sample to reach a set value and perform heat preservation for a plurality of time periods;
step eleven: start-up sigma1Direction, σ2Sum of directions σ3Directional stress loading, and loading the stress to a test set value;
step twelve: starting the servo high-pressure pump to perform seepage, recording the stable inlet and outlet pressure and flow, and obtaining the sigma according to the length of the rock sample, the cross section area of the rock sample in the direction vertical to the seepage direction and the hydrodynamic viscosity1Mechanical properties of permeability of the directional (X-direction) rock sample;
step thirteen: stopping the seepage test and the temperature loading, unloading the stress in three directions when the temperature in the heating box is reduced to 70 ℃, and unloading and shifting to 0 mm.
Fourteen steps: dismantle the first sigma2And (4) a direction loader, and taking out the tested rock sample by a sample crane.
Step fifteen: and (5) exporting data and analyzing.
Sixthly, the steps are as follows: repeating the steps one to fifteen to obtain the rock sample at the sigma2Direction (Y direction) and σ3Seepage characteristics in the direction (Z direction) or any inlet and outlet path.
The technical idea of the present invention is described in the above technical solutions, and the protection scope of the present invention is not limited thereto, and any changes and modifications made to the above technical solutions according to the technical essence of the present invention belong to the protection scope of the technical solutions of the present invention.

Claims (10)

1. The utility model provides a rock deep ground is jointly sent and is split, geothermol power is annotated and is adopted and seepage flow analogue test system which characterized in that: the device comprises a main stress loader, a host frame, a high-temperature heating box, a sample clamp, a working platform, a servo high-pressure pump and a high-pressure pulse motor; the sample clamp is used for clamping a rock sample; the high-temperature heating box is arranged in the main frame and is used for high-temperature loading and heat preservation of a rock sample in the sample clamp; the main stress loader provides true three-way stress for a rock sample in the sample clamp through the force measuring assembly and the pressure head assembly; the sample clamp is assembled by pressing plates, and the pressing plates comprise conventional pressing plates for joint fracturing and geothermal injection and production and seepage pressing plates for seepage simulation tests; a servo high-pressure pump and a high-voltage pulse motor are arranged below a working platform of the test system and are used for providing high-pressure water, liquid nitrogen and high-voltage pulse current when a combined fracturing test is carried out on a rock sample;
in the conventional pressing plate, except for the upper pressing plate provided with the packer through hole, the other pressing plates are solid pressing plates; the seepage press plate comprises a press plate body and a guide plate, wherein a rectangular groove is formed in the inner surface of the press plate body, the guide plate is sleeved in the rectangular groove of the press plate, and a water inlet and outlet pore passage and a vertical water hole connected with the water inlet and outlet pore passage are formed in the press plate body below the rectangular groove; the upper surface of the guide plate is carved with a transverse guide groove and a longitudinal guide groove, and the crossing position of the guide grooves is provided with seepage holes which penetrate through the guide plate; when the seepage test is carried out, the pressure plates corresponding to the set inlet and outlet flow directions are set to be seepage pressure plates with the same size, and the other pressure plates are solid pressure plates;
the pressing plate of the sample clamp specifically comprisesσ 3 A directional upper pressure plate,σ 3 A direction lower pressing plate,σ 1 A left pressing plate,σ 1 A right pressing plate,σ 2 A directional front pressing plate,σ 2 A direction rear pressing plate; the above-mentionedσ 3 A direction pressing plate andσ 3 the direction lower pressing plate is in a double-layer step shape, the inner surface of the direction lower pressing plate contacting the rock sample and the outer surface of the direction lower pressing plate contacting the pressure head are both rectangular, the middle layer surface is a concentric rectangular step surface, and the middle layer surface comprises a middle plane and an arc curved surface for transitionally connecting the middle plane and the inner surface; the above-mentionedσ 2 A directional front press plate andσ 2 the directionally rear platen contacts the inner surface of the rock sample andthe outer surface of the contact pressure head is rectangular, the contact pressure head is provided with a plurality of groovesσ 2 A directional front press plate andσ 2 the upper side and the lower side of the pressure plate are provided with rectangular planes with the width d, and the inner surface of the pressure plate is in transition connection with the upper side and the lower side through arc curved surfaces; the above-mentionedσ 1 A left directional pressure plate andσ 1 right hand pressure plate shape andσ 2 a directional front press plate andσ 2 the direction back pressure plate is the same shape.
2. The rock deep combined fracturing, geothermal injection and production and seepage simulation test system according to claim 1, wherein: the main stress loader consists ofσ 1 A direction loader,σ 2 A direction loader,σ 3 A direction loader; the above-mentionedσ 1 The direction loader comprises a firstσ 1 Direction loader, secondσ 1 The direction loader and the direction loader are horizontally and symmetrically arranged and are respectively and fixedly arranged on the left side and the right side of the host frame; the describedσ 2 The direction loader comprises a firstσ 2 Direction loader, secondσ 2 A direction loader arranged horizontally, wherein the first oneσ 2 The direction loader is detachably arranged right in front of the main frame, and the second direction loader is arranged right in front of the main frameσ 2 The direction loader is fixedly arranged right behind the host frame; the above-mentionedσ 3 The direction loader comprises a firstσ 3 Direction loader, secondσ 3 A direction loader of which the firstσ 3 The direction loader is fixed above the main frame and the second oneσ 3 The direction loader is fixedly arranged at the inner lower part of the test system through a loader reaction frame and a transverse rigid plate.
3. The rock deep combined fracturing, geothermal injection and production and seepage simulation test system according to claim 2, wherein: working platform of test systemIs provided with a guide rail, the firstσ 2 The lower part of the direction loader is provided with a pulley, the firstσ 2 The direction loader can be driven by the motor to be the first one after being disassembledσ 2 The test system also comprises a sample crane arranged on one side of the working platform, the sample crane can move through the guide rail, the rock sample can be taken out of the high-temperature heating box or sent into the high-temperature heating box through the mechanical arm before and after the test, and the tail end of the guide rail is provided with a limiting block;
the high-temperature heating box is fixedly arranged in a loading bin of the test system formed by the main machine frame and comprises a heating box front box plate and a heating box main box body, wherein the heating box main box body is formed by fixedly arranging five box plates at the upper, lower, left, right and rear sides, the heating box front box plate is packaged with the heating box main box body through a buckle lock, and rectangular through holes are formed in the six box plates at the upper, lower, left, right, front and rear sides of the high-temperature heating box and used for enabling a pressure head assembly to penetrate through; the acoustic emission probe that passes the heating cabinet box is equipped with on the high temperature heating cabinet box, the high temperature heating cabinet outside is equipped with the cooling ring canal for the cooling protection of high temperature heating cabinet exterior structure.
4. The rock deep combined fracturing, geothermal injection and production and seepage simulation test system according to claim 1, wherein: be equipped with high temperature resistant annular rubber sleeve on pressure head assembly's the briquetting, the last pressure head that is used for connecting servo high-pressure pump and high-voltage pulse motor in pressure head assembly's the pressure head is inside to be provided with a plurality of "L" type pipeline and buries the hole underground, the pipeline is buried the hole underground and is used for burying high pressure water/liquid nitrogen pipe underground respectively, annotates, the outlet pipe to and high-voltage pulse electrode interface, high pressure water/liquid nitrogen pipe, water injection pipe and outlet pipe are the spiral setting in vertical direction, have the compression ability of kick-backing.
5. The rock deep combined fracturing, geothermal injection and production and seepage simulation test system according to claim 1, wherein: the above-mentionedσ 1 Is provided with a left/right pressing plateσ 2 The direction LVDT sensor through-hole,σ 2 is provided with a front/rear pressing plateσ 1 The direction LVDT sensor through-hole,σ 3 the pressing plate in the direction is provided with a packer through hole for the penetration of the packer and the high-voltage pulse electrode circuit,σ 3 the center of the direction lower press plate is provided with a positioning bolt hole.
6. The rock deep combined fracturing, geothermal injection and production and seepage simulation test system according to claim 1, wherein: the describedσ 3 A directional upper press plate andσ 3 the length and the width of the inner surface of the pressing plate in the direction are respectively less than the length and the width of the rock sample by 10 mm; the describedσ 3 A directional upper press plate andσ 3 the length of the outer surface of the pressing plate contacting the pressing head in the direction = the length of the rock sample +σ 1 Square left pressing plate is full thickσ 1 The direction is right, the pressing plate is full thick, and the width of the outer surface of the pressing plate is = the width of a rock sample +σ 2 Front pressing plate is full thickσ 2 The direction back pressing plate is full thick;
the describedσ 2 A directional front press plate andσ 2 the length and the width of the inner surface of the directional rear pressure plate are respectively less than the length and the height of the rock sample by 10mm, and the directional rear pressure plate is provided with a pressure plateσ 2 A directional front press plate andσ 2 the direction back press plate, the length of the outer surface of which is less than the length of the rock sample by 10mm, and the height of the outer surface of which = the height of the rock sample +σ 3 Pressing plate in direction is full thick +σ 3 Full thickness of direction lower pressing plateσ 3 Rectangular side surface of pressing plate in direction is thickσ 3 The rectangular side of the lower pressing plate in the direction is 10mm below the lower pressing plate;
the above-mentionedσ 1 A left directional pressure plate andσ 1 arrangement mode of right pressing plate andσ 2 a directional front press plate andσ 2 the direction back pressure plate sets up the same, and clamp plate length is for being less than rock sample width 10 mm.
7. The rock deep combined fracturing, geothermal injection and production and seepage simulation test system according to claim 6, wherein: the above-mentionedσ 1 A left directional pressure plate,σ 1 Right pressing plate、σ 2 A directional front press plate andσ 2 t-shaped pressing plate sliding rails are detachably arranged on the side surfaces of the rear pressing plates in the directionσ 3 A direction pressing plate andσ 3 the side surfaces of the direction lower pressing plates are provided with pressing plate slideways corresponding to the sliding rails; the length of the pressing plate slide rail is equal to the width d of a rectangular plane on the upper side and the lower side of the four pressing plates, namely the front pressing plate, the rear pressing plate, the left pressing plate and the right pressing plate;
the above-mentionedσ 1 A left pressing plate,σ 1 Right pressing plate、σ 2 A directional front press plate andσ 2 the lower side surface of the direction rear pressing plate andσ 3 the direction lower pressing plates are directly contacted and pressed, and the upper side surfaces of the front, the rear, the left and the right pressing plates are connected withσ 3 A 10mm interval is reserved between the pressing plates in the direction, and the height of the pressing plate slide way is larger than that of the pressing plate slide rail; the above-mentionedσ 1 A left pressing plate,σ 1 Right pressing plate、σ 2 A directional front press plate andσ 2 the width d of the upper rectangular side and the lower rectangular side of the directional rear pressure plate is less thanσ 3 A direction pressing plate andσ 3 the width D of the middle plane of the direction lower pressure plate is 5mm (Δ D = D-D).
8. The rock deep combined fracturing, geothermal injection and production and seepage simulation test system according to claim 6, wherein:σ 1 、σ 2 the direction LVDT deformation sensors are embedded into corresponding LVDT sensor through holes, and two ends of each LVDT deformation sensor are fixed on adjacent pressing plates through L-shaped sensor supports;σ 3 the direction LVDT deformation sensor is arranged at the right angle of the sample clampIn the blank area, and is fixed by an L-shaped sensor bracketσ 3 A direction pressing plate andσ 3 the direction is lower than the pressing plate.
9. The rock deep combined fracturing, geothermal injection and production and seepage simulation test system according to claim 1, wherein: the seepage press plate can be used as a solid press plate after the guide plate in the seepage press plate is replaced by a solid plate with the same size.
10. A rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test method is characterized by comprising the following steps: the method is based on the test system of any one of claims 1-9, and is used for carrying out a combined fracturing test, a geothermal injection and production test or an anisotropic seepage test.
CN202110978856.6A 2021-08-25 2021-08-25 Rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system Active CN113686693B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110978856.6A CN113686693B (en) 2021-08-25 2021-08-25 Rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110978856.6A CN113686693B (en) 2021-08-25 2021-08-25 Rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system

Publications (2)

Publication Number Publication Date
CN113686693A CN113686693A (en) 2021-11-23
CN113686693B true CN113686693B (en) 2022-05-31

Family

ID=78582284

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110978856.6A Active CN113686693B (en) 2021-08-25 2021-08-25 Rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system

Country Status (1)

Country Link
CN (1) CN113686693B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114893177B (en) * 2022-06-21 2023-09-26 中国矿业大学 Water injection fracturing shear test system for simulating geothermal system dry-hot rock
CN116124606B (en) * 2023-03-02 2024-04-19 深圳大学 Deep-ground deep space deep sea rock physical mechanical testing cavity and three-dimensional multi-field information sensing cabin
CN116399784B (en) * 2023-06-07 2023-08-18 太原理工大学 Device and method for simulating geothermal exploitation seepage test of fractured thermal reservoir

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104655495A (en) * 2015-02-13 2015-05-27 太原理工大学 High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method
CN105547863A (en) * 2016-01-18 2016-05-04 北京工业大学 Bidirectional sample conveying component and two-dimensional rock sample seepage test device applying same
CN105547849A (en) * 2016-03-01 2016-05-04 安徽理工大学 True triaxial loading and unloading test device for large-size bedded pressure-bearing rock and testing method
WO2018113063A1 (en) * 2016-12-20 2018-06-28 东北大学 High pressure true triaxial hard rock constant-temperature aging cracking testing device and method
CN109870364A (en) * 2019-03-18 2019-06-11 福建工程学院 Stress-seepage coupling acts on the experimental rig and method of lower Rock And Soil
CN111426575A (en) * 2020-04-30 2020-07-17 东北大学 High-temperature high-stress true triaxial test device and method
CN113236240A (en) * 2021-05-27 2021-08-10 新疆正通石油天然气股份有限公司 High-temperature temporary blocking steering indoor true triaxial physical model experiment equipment and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104655495A (en) * 2015-02-13 2015-05-27 太原理工大学 High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method
CN105547863A (en) * 2016-01-18 2016-05-04 北京工业大学 Bidirectional sample conveying component and two-dimensional rock sample seepage test device applying same
CN105547849A (en) * 2016-03-01 2016-05-04 安徽理工大学 True triaxial loading and unloading test device for large-size bedded pressure-bearing rock and testing method
WO2018113063A1 (en) * 2016-12-20 2018-06-28 东北大学 High pressure true triaxial hard rock constant-temperature aging cracking testing device and method
CN109870364A (en) * 2019-03-18 2019-06-11 福建工程学院 Stress-seepage coupling acts on the experimental rig and method of lower Rock And Soil
CN111426575A (en) * 2020-04-30 2020-07-17 东北大学 High-temperature high-stress true triaxial test device and method
CN113236240A (en) * 2021-05-27 2021-08-10 新疆正通石油天然气股份有限公司 High-temperature temporary blocking steering indoor true triaxial physical model experiment equipment and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Zaobao Liu 等.A new experimental method for tensile property study of quartz sandstone under confining pressure.《International Journal of Rock Mechanics and Mining Sciences》.2019,第123卷 *

Also Published As

Publication number Publication date
CN113686693A (en) 2021-11-23

Similar Documents

Publication Publication Date Title
CN113686693B (en) Rock deep-ground combined fracturing, geothermal injection and production and seepage simulation test system
CN104655495B (en) High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method
CN108445193B (en) Grouting test system for prefabricated crack-containing rock mass under excavation stress and use method
CN110005400B (en) Device for testing cementing surface of shaft sleeve and cement sheath in high-temperature and high-pressure environment of dry-hot rock stratum
CN112031727B (en) Physical simulation device and method for fracturing horizontal well multi-medium throughput
CN106353197B (en) High-pressure multiphase flow coupling rock true triaxial test system and method thereof
CN212658548U (en) High-temperature high-pressure true triaxial rock fracturing test device
CN102288480B (en) Device for sealing triaxial test sample of soil body and method for using device
CN109298162A (en) Different phase carbon dioxide fracturing shale device and experimental method
CN112903470B (en) High-temperature seepage coupling experimental device and method based on hard rock true triaxial system
CN108180035B (en) Gas extraction method for combined operation of drilling and permeability increasing of high-gas low-permeability coal seam
CN104535727B (en) A kind of waterpower sandfrac system
CN113803009B (en) High-temperature and high-pressure environment simulation cabin for large calibration rock sample
CN111005754A (en) Multi-stage gas fluidized extraction method for multi-layered coal body
Wang et al. Study of the dynamic fracturing process and stress shadowing effect in granite sample with two holes based on SCDA fracturing method
CN104374637A (en) Water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition
CN110146389B (en) True triaxial direct shear test box and method for simulating force-heat-liquid coupling environment
KR102099016B1 (en) Apparatus for gas fracturing for enhancing rock permeability and evaluation method for enhancement of rock permeability using thereof
Li et al. Study on gas leakage along cement sheath interfaces in salt cavern gas storage well
CN114354683A (en) High/low temperature rock mass enhanced heat transfer and power disturbance test method under multi-field loading
CN212406713U (en) Experimental device for simulating fractured-vuggy carbonate reservoir
CN210087307U (en) Device for testing cementing surface of shaft sleeve-cement sheath in high-temperature and high-pressure environment of dry hot rock stratum
CN110700823A (en) Loading body for true triaxial crack propagation simulation and permeability synchronous experiment and permeability test characterization method
CN219179125U (en) Rock high temperature high pressure environment simulation experiment device and experiment system thereof
CN110823707A (en) Sample true triaxial sealing loading device and method for pressure-relief coal bed gas development simulation

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant