CN114509378A - Simulation device and experiment method for seepage and pyrolysis in-situ mining of organic rock - Google Patents
Simulation device and experiment method for seepage and pyrolysis in-situ mining of organic rock Download PDFInfo
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- CN114509378A CN114509378A CN202210385741.0A CN202210385741A CN114509378A CN 114509378 A CN114509378 A CN 114509378A CN 202210385741 A CN202210385741 A CN 202210385741A CN 114509378 A CN114509378 A CN 114509378A
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
- G01N7/16—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference by heating the material
Abstract
The invention provides a simulation device and an experimental method for seepage and pyrolysis in-situ mining of organic rock, belonging to the technical field of underground unconventional resource high-efficiency and clean mining; the technical problem to be solved is as follows: the improvement of the structure of the simulation device for the seepage and pyrolysis in the in-situ mining of the organic rock is provided; the technical scheme for solving the technical problems is as follows: the system comprises an in-situ pyrolysis mechanism reaction kettle, a high-temperature fluid generation system, a stress application system, an oil gas collection system and the like, wherein the in-situ pyrolysis mechanism reaction kettle is connected with the high-temperature fluid generation system and the oil gas collection system to realize pyrolysis and product collection of organic rock, and the permeability of the organic rock can be tested in real time by controlling the opening and closing of a valve by using a steady state method or a transient state method; simultaneously, the method has the switching of the axial pressure applied by the double-cylinder displacement pump and the press; the method is applied to in-situ pyrolysis and seepage experiments of the organic rock.
Description
Technical Field
The invention provides a simulation device and an experimental method for seepage and pyrolysis in-situ mining of organic rock, belongs to the field of research on efficient and clean mining of underground unconventional resources, and is used for simulating an underground in-situ state of the organic rock to carry out real-time pyrolysis and seepage research.
Background
China is rich in organic rock (coal, oil shale, etc.) reserves. The basic national condition of China is that the oil is poor and the gas is little, and a large amount of finished oil capable of replacing petroleum can be obtained by carrying out anaerobic pyrolysis on organic rock, so that the finished oil can be used as a great supplement for petroleum resources. Therefore, it is very important to reasonably exploit and fully utilize organic rocks. A series of problems of environmental protection, mining cost, quality of finished oil produced by pyrolysis and the like also need to be considered through oil production of organic rocks, in-situ mining is a green, clean and safe mining technology, only holes are drilled and distributed on the ground, one or more wells are used as heating wells to directly heat the organic rocks, when organic matters are fully pyrolyzed to form oil gas, products are discharged and mined from other well networks, residues after pyrolysis are still in the ground to support overlying strata, and surface subsidence is avoided. In order to make the exploitation of organic rock resources more efficient, a sufficient pore-cracking structure must be formed inside the organic rock, which directly reflects the permeability of the rock mass, so that it is important to fully research the pyrolysis and seepage characteristics of the organic rock. Therefore, the invention provides the simulation device and the experimental method for realizing the seepage and pyrolysis in-situ mining of the organic rock, and the pyrolysis and seepage characteristics in the in-situ mining process of the organic rock can be fully researched, so that a theoretical basis is better provided for on-site practice.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to solve the technical problems that: the improvement of the structure of the simulation device for in-situ mining seepage and pyrolysis of the organic rock is provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a simulation device for seepage and pyrolysis in situ mining of organic rock comprises an in situ pyrolysis mechanism reaction kettle, a high-temperature fluid generation system, a stress application system and an oil gas collection system, wherein an organic rock sample is filled in the in situ pyrolysis mechanism reaction kettle, and a heating sleeve is wrapped on the periphery of the in situ pyrolysis mechanism reaction kettle; the high-temperature fluid generation system comprises a high-temperature thermal fluid generator, and the high-temperature thermal fluid generator is connected with the in-situ pyrolysis mechanism reaction kettle through a pipeline;
the stress applying system comprises a servo hydraulic control frame, a double-cylinder displacement pump, a press machine and a confining pressure pump, wherein the servo hydraulic control frame fixes the in-situ pyrolysis mechanism reaction kettle, the double-cylinder displacement pump is connected with the in-situ pyrolysis mechanism reaction kettle through an upstream pipeline, the confining pressure pump is connected with the in-situ pyrolysis mechanism reaction kettle through a downstream pipeline, and an outlet pipeline of the confining pressure pump is provided with a confining pressure pump valve;
an inert gas cylinder and an upstream gas chamber are further connected to an upstream pipeline of the in-situ pyrolysis mechanism reaction kettle, wherein the inert gas cylinder is arranged between the high-temperature thermal fluid generator and the double-cylinder displacement pump, the upstream gas chamber is arranged on a pipeline close to the in-situ pyrolysis mechanism reaction kettle, a generator valve, a gas cylinder valve, a displacement pump valve and an upstream gas chamber valve are respectively arranged on outlet pipelines of the high-temperature thermal fluid generator, the inert gas cylinder, the double-cylinder displacement pump and the upstream gas chamber, and a first valve, a temperature display meter and a first barometer are arranged on the upstream pipeline of the in-situ pyrolysis mechanism reaction kettle;
a third barometer is arranged on a downstream pipeline of the in-situ pyrolysis mechanism reaction kettle;
the oil gas collecting system comprises a condenser, the condenser is connected with a fluid outlet of the in-situ pyrolysis mechanism reaction kettle through a pipeline, a second valve is arranged on an inlet pipeline of the condenser, a back pressure valve is arranged on an outlet pipeline of the condenser, a downstream air chamber is further connected to a fluid outlet pipeline of the in-situ pyrolysis mechanism reaction kettle, a downstream air chamber valve is arranged on an outlet pipeline of the downstream air chamber, and a second gas pressure gauge, a flow meter and an inert gas control valve are further arranged on the fluid outlet pipeline of the in-situ pyrolysis mechanism reaction kettle;
a branch pipeline is also connected to the pipeline between the back pressure valve and the inert gas control valve, the tail end of the branch pipeline is connected with two pipelines, namely a gas pipeline and a liquid pipeline, a pressure reducing valve is arranged on the branch pipeline, a gas control valve is arranged on the gas pipeline, and a liquid control valve is arranged on the liquid pipeline;
the system comprises an in-situ pyrolysis mechanism reaction kettle, a branch pipeline, a first barometer valve, a second barometer valve and a branch pipeline, wherein the upstream pipeline of the in-situ pyrolysis mechanism reaction kettle is connected with the fluid outlet pipeline through the branch pipeline, the branch pipeline is provided with a fourth barometer, the branch pipeline of the upstream pipeline of the in-situ pyrolysis mechanism reaction kettle is connected with the fourth barometer, and the branch pipeline of the fluid outlet pipeline of the in-situ pyrolysis mechanism reaction kettle is connected with the fourth barometer.
The back pressure valve is connected with a hand pump through a pipeline.
The upper part of the in-situ pyrolysis mechanism reaction kettle is provided with an axial pressure applying head, and the side surface of the axial pressure applying head is provided with a fluid injection port for connecting a high-temperature thermal fluid generator and an inert gas cylinder;
the axial pressure applying head is sequentially provided with a pressure transmitting head, a first metal clamping ring, a second metal clamping ring, a pressure transmitting cavity, an axial displacement meter, a first pressure transmitting cavity liquid inlet, a flange at the joint of a pressure transmitting system and the high-temperature and high-pressure resistant long-distance reaction kettle, a second pressure transmitting cavity liquid inlet, a first water circulation cooling device and a second water circulation cooling device below the axial pressure applying head, and the second water circulation cooling device is used for connecting a stress applying system to realize the switching of different axial pressure loading modes;
a confining pressure injection port on the side surface of the middle part of the in-situ pyrolysis mechanism reaction kettle is connected with a confining pressure pump, and high-temperature oil is injected to provide required confining pressure for an experiment;
the side surface of the lower part of the in-situ pyrolysis mechanism reaction kettle is provided with a fluid outlet, so that high-temperature hot fluid used for pyrolyzing the organic rock, products generated by pyrolyzing the organic rock and nitrogen or inert gas used for performing a permeation experiment are discharged out of the reaction kettle, and the fluid outlet is connected with a condenser through a pipeline.
The organic rock sample adopts the purple copper cover parcel, and the red copper cover passes through the metal clamp to be fixed to the upper and lower extreme is sealed through first graphite, second graphite to the red copper cover respectively, makes purple copper cover and organic rock sample tightly laminate.
The double-cylinder displacement pump and the confining pressure pump adopt pumps with two working modes of constant flow and constant pressure, the working pressure is 0-50 MPa, the digital display resolution of the pressure is 0.01MPa, and the flow is 0.001-20 mL/min.
The medium in the double-cylinder displacement pump and the confining pressure pump adopts water or oil, wherein the volume of a horizontal bar pump body of the double-cylinder displacement pump is 200ml, the resolution ratio is 0.01ml, and the frequency of liquid injection pressure acquisition for the double-cylinder displacement pump and the confining pressure pump is 10-100 times/second.
The system is characterized by further comprising a control center, wherein the control center comprises a PC terminal and a display, the PC terminal is respectively connected with an upstream pipeline, a downstream pipeline, a fluid outlet pipeline and instruments, control valves and a driving pump which are arranged on a branch pipeline of the in-situ pyrolysis mechanism reaction kettle through leads, the upstream pipeline, the downstream pipeline, the fluid outlet pipeline and the instruments and valves which are arranged on the branch pipeline of the in-situ pyrolysis mechanism reaction kettle are all high-temperature and high-pressure resistant devices, the lowest bearing temperature is 600 ℃, and the lowest bearing pressure is 50 MPa.
A simulation experiment method for seepage and pyrolysis in-situ mining of organic rock comprises the following steps:
s1: wrapping the cut organic rock sample with a red copper sleeve, putting the red copper sleeve into a reaction kettle with an in-situ pyrolysis mechanism, sealing and fixing the red copper sleeve by using a metal hoop and first graphite, and ensuring bolts at each part of the reaction kettle to be screwed down;
s2: opening a displacement pump valve and a surrounding pressure pump valve, closing a gas cylinder valve of inert gas and a generator valve, connecting a double-cylinder displacement pump with a liquid inlet of a first pressure transmission cavity, sealing a first metal clamping sleeve ring and a second metal clamping sleeve ring by graphite and clamping by bolts, and providing axial pressure and surrounding pressure with set pressure for a massive organic rock sample by the double-cylinder displacement pump and the surrounding pressure pump to enable the organic rock sample to reach an in-situ stress state;
s3: carrying out an in-situ high-temperature pyrolysis experiment on an organic rock sample, and testing the permeability by a transient method or a steady state method, wherein the pyrolysis temperature of the transient method is lower than 200 ℃, the pyrolysis temperature is reached by heating through a heating sleeve, the pyrolysis temperature of the steady state method is higher than 200 ℃, and the high-temperature fluid generated by a high-temperature thermal fluid generator is reached to the pyrolysis temperature.
The concrete steps of the step S3 for testing the permeability by the transient method are as follows:
s3.11: at the moment, the organic rock sample reaches an in-situ stress state, the organic rock sample is sequentially heated to appointed different temperatures through a heating sleeve, after the temperature is constant, a second valve, a back pressure valve, a pressure reducing valve, a gas control valve and a liquid control valve are opened, organic rock oil and organic rock gas generated by pyrolysis are collected through an oil gas collecting system, then corresponding pore pressures are respectively provided for an upstream gas chamber and a downstream gas chamber after heat preservation is set for a long time, then the first valve and the second valve are closed, the upstream gas chamber valve, the downstream gas chamber valve, a first barometer valve and a second barometer valve are opened, a completely airtight environment is constructed, and then gas with pressure difference is provided for the upstream gas chamber and the downstream gas chamber to pass through the organic rock sample, so that a relevant curve is obtained;
and after the temperature point is tested, continuously heating to the next temperature point until the highest set temperature value, and repeating the process to finish the permeability test by the transient method.
The specific steps of testing the permeability through the steady state method in the step S3 are as follows:
s3.21: after the pyrolysis experiment and the permeability test of the highest set temperature value are completed, connecting the double-cylinder displacement pump with the liquid inlet of the second pressure transmission cavity to push the pressure transmission head back;
s3.22: after the pressure transmission head is pushed back, the first metal ferrule ring is detached, the second metal ferrule ring is sealed by graphite and clamped by bolts again, and the axial pressure and the confining pressure with set pressure are provided for the organic rock sample by the press machine and the confining pressure pump, so that the organic rock sample reaches the in-situ stress state again;
s3.23: closing the heating sleeve, then opening a generator valve after the high-temperature thermal fluid generator works to generate high-temperature fluid, closing a gas cylinder valve of inert gas and a displacement pump valve, introducing the high-temperature fluid into an organic rock sample through a pipeline through a fluid injection port of the in-situ pyrolysis mechanism reaction kettle, and carrying out an in-situ high-temperature pyrolysis experiment on the organic rock sample;
s3.24: setting different temperature points according to the indication number of a temperature display meter, after reaching a specific temperature point and the temperature is constant, opening a second valve, a back pressure valve, a pressure reducing valve, a gas control valve and a liquid control valve, collecting organic rock oil and organic rock gas generated by pyrolysis through an oil-gas collecting system, then closing a generator valve, an upstream air chamber valve, a downstream air chamber valve, a pressure reducing valve, a gas control valve, a liquid control valve, a first barometer valve, a second barometer valve and a displacement pump valve after keeping the temperature for a set time, opening a gas cylinder valve, the second valve, the back pressure valve and an inert gas control valve, supplying pressure to the back pressure valve without using a hand pump, introducing inert gas for testing different pore pressure permeability, recording the inert gas flow Q after the flow meter is digitally stabilized, and testing the next pore pressure permeability at intervals, and after the current temperature permeability test is finished, continuously heating to the next temperature, and performing the steady-state permeability test by using the same steps.
Compared with the prior art, the invention has the beneficial effects that:
1. the real-time in-situ seepage and pyrolysis characteristics of different types of organic rocks (complete rocks, broken rocks and fractured rocks) can be tested;
2. the permeability tests of ultra-low permeability rock, low permeability rock and porous high permeability rock can be completely realized;
3. the axial pressure loading mode of the in-situ pyrolysis mechanism reaction kettle can be loaded by a press machine or a displacement pump, and different loading modes can be selected according to pyrolysis environments.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of the overall system of the present invention;
FIG. 2 is a schematic diagram of the structure of an in situ pyrolysis mechanism reactor of the present invention;
in the figure: 1 is a high-temperature thermal fluid generator; 2 is a generator valve; 3 is an inert gas cylinder; 4 is a gas cylinder valve; 5 is a double-cylinder displacement pump; 6 is a displacement pump valve; 7 is a first valve; 8 is an upstream air chamber; 9 is an upstream air chamber valve; 10 is a temperature display meter; 11 is a first air pressure gauge; 12 is an in-situ pyrolysis mechanism reaction kettle; 13 is a fourth barometer; 14 is a first barometer valve; 15 is a second barometer valve; 16 is a third barometer; 17 is a second barometer; 18 is a surrounding pressure pump valve; 19 is a downstream air chamber; 20 is a condenser; 21 is a back pressure valve; 22 is a flow meter; 23 is a hand pump; 24 is a confining pressure pump; 25 is a control center; 26 is a downstream plenum valve; 27 is a fluid injection port; 28 is an axial pressure applying head; 29 is a pressure transmission head; 30 is a first metal collar ring; 31 is a second metal collar ring; 32 is a pressure transmission cavity; 33 is an axial displacement meter; 34 is a liquid inlet of the first pressure transfer cavity; 35 is a flange; 36 is a liquid inlet of the second pressure transmission cavity; 37 is a first water circulation cooling device; 38 is a second water circulation cooling device; 39 is a first graphite; 40 is an organic rock sample; 41 is a metal hoop; 42 is a confining pressure injection port; 43 is a second graphite; 44 is a fluid outlet; 45 is a second valve; 46 is a heating jacket; 47 is an inert gas control valve; 48 is a pressure reducing valve; 49 is a gas control valve; and 50 is a liquid control valve.
Detailed Description
As shown in fig. 1-2, the high-temperature high-pressure simulation apparatus for realizing in-situ mining seepage and pyrolysis of organic rock provided by the invention comprises an in-situ pyrolysis mechanism reaction kettle, a high-temperature fluid generation system, a stress application system, a steady-state method test system, a transient method test system, an oil-gas collection system and the like.
The length of the in-situ pyrolysis mechanism reaction kettle 12 is 800mm, the inner diameter is 255mm, an organic rock sample 40 is filled in the in-situ pyrolysis mechanism reaction kettle, the size of the sample is phi 50mm multiplied by 100mm, and the sample can be complete rock, broken rock or fractured rock (single fracture and multi-fracture). The upper part of the in-situ pyrolysis mechanism reaction kettle 12 is provided with an axial pressure applying head 28, the side surface of the axial pressure applying head is provided with a fluid injection port 27 which is used for connecting the high-temperature thermal fluid generator 1 and the inert gas cylinder 3, and the injected fluid can be high-temperature fluid, normal-temperature inert gas and the like. The axial pressure applying head 28 is sequentially provided with a pressure transmitting head 29, a first metal clamping ring 30, a second metal clamping ring 31, a pressure transmitting cavity 32, an axial displacement meter 33, a first pressure transmitting cavity liquid inlet 34, a flange 35 at the joint of the pressure transmitting system and the high-temperature and high-pressure resistant long-distance reaction kettle, a second pressure transmitting cavity liquid inlet 36, a first water circulation cooling device 37 and a second water circulation cooling device 38 below the axial pressure applying head, and the first water circulation cooling device, the second water circulation cooling device, the first water circulation cooling device and the second water circulation cooling device are used for being connected with a stress applying system to realize the switching of different axial pressure loading modes. And a confining pressure injection port 42 on the side surface of the middle part of the in-situ pyrolysis mechanism reaction kettle 12 is connected with the confining pressure pump 24, and high-temperature oil is injected to provide required confining pressure for an experiment. In-situ pyrolysis mechanism the sides of reaction vessel 12 are covered with heating jacket 46. The side of the lower part of the in-situ pyrolysis mechanism reaction kettle 12 is provided with a fluid outlet 44, so that high-temperature hot fluid used for pyrolyzing the organic rock, products generated by pyrolyzing the organic rock and nitrogen or inert gas used for performing a permeation experiment are discharged out of the reaction kettle and are connected with a condenser 20 for collecting small condensed oil gas.
Further, the organic rock sample 40 is wrapped by a red copper sleeve with the thickness of 1-3mm, and the red copper sleeve is tightly attached to the organic rock sample 40 after being fixed by a metal hoop 41 and sealed by the first graphite 39 and the second graphite 43.
Further, the heating jacket 46 is wrapped around the in-situ pyrolysis mechanism reaction kettle 12, and when the organic rock sample 40 is complete and low-permeability rock, the in-situ pyrolysis mechanism reaction kettle 12 needs to be heated by the heating jacket 46 before the threshold temperature of the permeation transition.
Further, the in-situ pyrolysis mechanism reaction kettle 12 can be axially loaded by using a press machine or a double-cylinder displacement pump 5.
Further, the kettle body of the in-situ pyrolysis mechanism reaction kettle 12 is required to be light in weight, the kettle body material can ensure that enough strength is still maintained under the high-temperature condition, and the kettle body has the advantages of good corrosion resistance, small structural size and easiness in disassembly; the annular pressure sleeve still needs to be sealed reliably at high temperature and is convenient to assemble and disassemble.
The high-temperature fluid generation system mainly comprises a high-temperature fluid generator 1 and other auxiliary elements.
Further, the high-temperature thermal fluid generator 1 is connected to the in-situ pyrolysis mechanism reaction kettle 12 through a pipeline, and the high-temperature thermal fluid generated by the high-temperature thermal fluid generator 1 enters the organic rock sample 40 through the pipeline through the fluid injection port 27 to complete the in-situ pyrolysis experiment on the organic rock sample 40. And a safety valve is welded on the upper part of the high-temperature thermal fluid generator 1.
The stress applying system mainly comprises a servo hydraulic control frame, a high-precision constant-current constant-pressure double-cylinder displacement pump 5, a press machine and a confining pressure pump 24.
Further, servo hydraulic control frame is four column type frames, fixes normal position pyrolysis mechanism reation kettle 12, chooses for use different axle pressure confined pressure loading modes according to the experiment temperature condition of difference: firstly, a double-cylinder displacement pump 5 and a confining pressure pump 24 apply axial pressure and confining pressure; the press and confining pressure pump 24 apply axial pressure and confining pressure.
Further, when the loading temperature is 0 ℃ to the critical temperature of ultra-low permeability and low permeability, the double-cylinder displacement pump 5 is connected with a liquid inlet 34 of the first pressure transfer cavity, the first metal clamping ring 30 and the second metal clamping ring 31 are sealed by graphite and clamped by bolts, so that the double-cylinder displacement pump 5 can be loaded with axial pressure, and after the axial pressure loading is finished, the double-cylinder displacement pump 5 is connected with a liquid inlet 36 of the second pressure transfer cavity, so that the pressure transfer head 29 can be pushed back; when the loading temperature is 200-550 ℃, it is safer to use the press machine to load the axial compression, at this time, the first metal clamping ring 30 is disassembled, the second metal clamping ring 31 is sealed by graphite again and clamped by bolts, and then the press machine can be directly used to apply the axial compression to the test piece.
Further, the double-cylinder displacement pump 5 and the confining pressure pump 24 are required to have two working modes of constant flow and constant pressure and various different working modes under corresponding modes, the flow and the pressure of fluid discharged by the pumps are accurately controlled, the working pressure is 0-50 MPa, the digital display resolution of the pressure is 0.01MPa, and the flow is 0.001-20 mL/min.
Further, the medium used by the double-cylinder displacement pump 5 and the confining pressure pump 24 is water or oil, the volume of the single-cylinder pump body of the double-cylinder displacement pump 5 is 200ml, the resolution ratio is 0.01ml, and the acquisition frequency of the system for acquiring the injection pressure of the double-cylinder displacement pump 5 and the confining pressure pump 24 is 10-100 times/second.
The steady-state method testing system mainly comprises an inert gas cylinder 3, a double-cylinder displacement pump 5, a confining pressure pump 24, an in-situ pyrolysis mechanism reaction kettle 12, a high-precision flow meter 22 and other auxiliary elements.
Further, when the rock is not in a hypotonic state, the permeability of the organic rock sample 40 is tested by using a steady-state testing system.
Further, before the permeability is tested by the steady-state method, a high-temperature fluid generation system is needed to generate a high-temperature thermal fluid which enters the organic rock sample 40 through a pipeline to enable the sample to reach the specified temperature.
Further, in order to avoid the influence of pyrolysis gas on the permeability test in the heating process, a steady-state method test system is used for testing the permeability until no product exists.
Further, during the experiment for testing permeability by the steady state method, it is not possible to use the hand pump 23 to supply pressure to the back pressure valve 21.
Further, when the high-precision flow meter 22 is digitally stabilized, the permeability test can be completed by recording the flow rate Q of nitrogen or inert gas.
The transient test system mainly comprises an upstream air chamber 8, a downstream air chamber 19, an in-situ pyrolysis mechanism reaction kettle 12, a fourth pressure gauge 13 and other auxiliary elements.
Further, when the rock is in a low-permeability or ultra-low-permeability state, the permeability of the organic rock sample 40 is tested by adopting a transient test system.
Further, in the process of testing the permeability by using the transient test system, the first valve 7 and the second valve 45 must be ensured to be closed, so that the test system is in a closed state, and the accuracy of a test result is ensured.
Further, the air cell pressures of the upstream air cell 8 and the downstream air cell 19 are lower than the axial pressure applied to the organic rock sample 40, so as to prevent the red copper bush wrapping the sample from being broken.
It is further noted that the pressure of the upstream air chamber is 0.5 to 4MPa, and the pressure of the downstream air chamber is 0.25 to 3MPa, and the values can be adjusted according to specific experimental conditions.
The oil gas collecting system is composed of a condenser 20, wherein one end of the condenser 20 is connected with a fluid outlet 44 through a pipeline, and the other end of the condenser is connected with a back pressure valve 21 through a pipeline, so that oil gas products formed by pyrolysis of the organic rock sample 40 enter the condenser 20 through the fluid outlet 44 through a pipeline to be separated from oil gas, and then are discharged and collected through the back pressure valve 21.
Further, the pressure of the backpressure valve 21 is provided through the hand pump 23 according to the oil gas pressure to be finally collected in the experiment.
Further, the inert gas for testing permeability is discharged and collected through the inert gas control valve 47 via the flow meter 22.
Further, the organic rock gas and the organic rock oil generated by pyrolyzing the organic rock sample 40 still have a large pressure after being condensed and separated by the condenser 20, so that the organic rock gas and the organic rock oil are collected by firstly reducing the pressure by the pressure reducing valve 48 and then respectively passing through the gas control valve 49 and the liquid control valve 50.
The simulation experiment method for the in-situ mining seepage and pyrolysis of the organic rock by adopting the simulation device is described in detail according to the following two different embodiments.
Example 1
When the burial depth of the ore bed is 300m, the pyrolysis sample is massive oil shale, and the specific experimental steps are as follows:
1. a cut sample with the size of phi 50mm multiplied by 100mm is wrapped with a red copper sleeve with the thickness of 1mm and is placed into an in-situ pyrolysis mechanism reaction kettle 12, then the red copper sleeve is sealed and fixed by a metal hoop 41, first graphite 39 and second graphite 43, and bolts at all positions of the reaction kettle are screwed tightly.
2. Opening a displacement pump valve 6 and a confining pressure pump valve 18, closing a gas cylinder valve 4 of inert gas and a generator valve 2, connecting a double-cylinder displacement pump 5 with a first pressure transmission cavity liquid inlet 34, sealing a first metal clamping ring 30 and a second metal clamping ring 31 with graphite and clamping with bolts, and providing a shaft pressure of 7.5MPa and a confining pressure of 9MPa for a massive oil shale sample through the double-cylinder displacement pump 5 and the confining pressure pump 24.
3. At the moment, the oil shale sample reaches an in-situ stress state, the sample is sequentially heated to a specified temperature (20 ℃, 50 ℃, 100 ℃, 150 ℃, 200 ℃) through a heating sleeve 46, after the temperature is constant, a second valve 45, a back pressure valve 21, a pressure-resistant reducing valve 48, a gas control valve 49 and a liquid control valve 50 are opened, oil shale oil and oil shale gas generated by pyrolysis are collected through an oil-gas collecting system, after heat preservation is carried out for 10 hours, corresponding pore pressures (respectively (0.75 MPa, 0.25MPa, 1.25MPa, 0.75MPa, 2.25MPa, 1.75MPa and 3.25MPa and 2.75 MPa) are respectively provided for an upstream air chamber 8 and a downstream air chamber 19, then a first valve 7 and a second valve 45 are closed, a downstream air chamber valve 9, a first pressure gauge 14 and a second pressure gauge 15 are opened, a completely airtight environment is constructed, the gas with pressure difference is provided by the upstream air chamber 8 and the downstream air chamber 19 to pass through the organic rock sample 40, and a correlation curve is obtained. And after the temperature point is tested, continuously heating to the next temperature point until the temperature reaches 200 ℃, and repeating the process to test the permeability by the transient method.
4. After the pyrolysis experiment and the permeability test at 200 ℃ are completed, the double-cylinder displacement pump 5 is connected with the liquid inlet 36 of the second pressure transmission cavity, so that the pressure transmission head 29 is pushed back.
5. After the pressure transmission head 29 is pushed back, the first metal clamping ring 30 is detached, the second metal clamping ring 31 is sealed by graphite and clamped by bolts again, and 7.5MPa axial pressure and 9MPa confining pressure are provided for the test sample by the press machine and the confining pressure pump 24, so that the test sample reaches the in-situ stress state again.
6. And (3) closing the heating sleeve 46, then opening the valve 2 of the high-temperature thermal fluid generator after the high-temperature thermal fluid generator 1 works to generate high-temperature fluid, closing the inert gas cylinder valve 4 and the displacement pump valve 6, introducing the high-temperature fluid into the organic rock sample 40 through the pipeline through the fluid injection port 27 of the reaction kettle, and carrying out in-situ high-temperature pyrolysis experiment on the sample.
7. Setting different temperature points according to the indication number of the high-precision temperature display meter 10, opening the second valve 45, the backpressure valve 21, the pressure reducing valve 48, the gas control valve 49 and the liquid control valve 50 when the temperature reaches a specific temperature point (300 ℃, 350 ℃, 400 ℃, 450 ℃, 500 ℃ and 550 ℃) and keeping the temperature constant, collecting the oil shale oil and the oil shale gas generated by pyrolysis through an oil gas collecting system, then keeping the temperature for 10h, closing the high generator valve 2, the upstream air chamber valve 9, the downstream air chamber valve 26, the pressure reducing valve 48, the gas control valve 49, the liquid control valve 50, the first pressure gauge valve 14, the second pressure gauge valve 15 and the displacement pump valve 6, opening the gas cylinder valve 4, the second valve 45, the backpressure valve 21 and the inert gas control valve 47 of the inert gas without using the hand pump 23 to provide pressure for the backpressure valve 21, and introducing nitrogen to carry out permeability tests of different pore pressures (0.5 MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa and 3 MPa), recording the nitrogen flow Q after the number of the high-precision flowmeter 22 is stable, carrying out the next permeability test under the pore pressure at an interval of twenty minutes, and after the current permeability test at the temperature is finished, continuously heating to the next temperature, and carrying out the permeability test by using the same step in a steady state method.
Example 2
When the buried depth of the ore bed is 800m, the pyrolysis sample is a single-crack coal briquette, and the specific experimental steps are as follows:
1. a cut sample with the size of phi 50mm multiplied by 100mm is wrapped with a red copper sleeve with the thickness of 1mm and is placed into an in-situ pyrolysis mechanism reaction kettle 12, then the red copper sleeve is sealed and fixed by a metal hoop 41, first graphite 39 and second graphite 43, and bolts at all positions of the reaction kettle are screwed tightly.
2. Opening a displacement pump valve 6 and a confining pressure pump valve 18, closing an inert gas cylinder valve 4 and a generator valve 2, connecting a double-cylinder displacement pump 5 with a first pressure transmission cavity liquid inlet 34, sealing a first metal clamping ring 30 and a second metal clamping ring 31 with graphite and clamping with bolts, and providing 20MPa axial pressure and 24MPa confining pressure for a coal briquette sample through the double-cylinder displacement pump 5 and the confining pressure pump 24.
3. At the moment, the coal briquette sample reaches an in-situ stress state, the sample is sequentially heated to a specified temperature (20 ℃, 50 ℃, 100 ℃, 150 ℃, 200 ℃) through a heating sleeve 46, after the temperature is constant, a second valve 45, a back pressure valve 21, a pressure reducing valve 48, a gas control valve 49 and a liquid control valve 50 are opened, oil shale oil and oil shale gas generated by pyrolysis are collected through an oil-gas collection system, heat is preserved for 10 hours, corresponding pore pressures (respectively (1.25 MPa, 0.75 MPa), (2.25 MPa, 1.75 MPa), (3.25 MPa, 2.75 MPa), (4.25 MPa and 3.75 MPa) are respectively provided for an upstream gas chamber 8 and a downstream gas chamber 19), then the first valve 7 and the second valve 45 are closed, the upstream gas chamber valve 9, the downstream gas chamber 26, the first pressure gauge valve 14 and the second pressure gauge valve 15 are opened, a completely airtight environment is constructed, gas with pressure difference is provided for passing through the organic rock sample 40 from the upstream gas chamber 8 and the downstream gas chamber 19, and (5) obtaining a correlation curve. And after the temperature point is tested, continuously heating to the next temperature point until the temperature reaches 200 ℃, and repeating the process to finish the permeability test by the transient method.
4. After the pyrolysis experiment and the permeability test at 200 ℃ are completed, the double-cylinder displacement pump 5 is connected with the liquid inlet 36 of the second pressure transmission cavity, so that the pressure transmission head 29 is pushed back.
5. After the pressure transmission head 29 is pushed back, the first metal clamping ring 30 is detached, the second metal clamping ring 31 is sealed by graphite and clamped by bolts again, and 20MPa axial pressure and 24MPa confining pressure are provided for the test piece through the press machine and the confining pressure pump 24, so that the test piece reaches the in-situ stress state again.
6. And (3) closing the heating sleeve 46, then opening the generator valve 2 after the high-temperature thermal fluid generator 1 works to generate high-temperature fluid, closing the gas cylinder valve 4 and the displacement pump valve 6 of the inert gas, introducing the high-temperature fluid into the organic rock sample 40 through the pipeline through the fluid injection port 27 of the reaction kettle, and carrying out an in-situ high-temperature pyrolysis experiment on the sample.
7. Setting different temperature points according to the indication number of the high-precision temperature display meter 10, opening the second valve 45, the backpressure valve 21, the pressure reducing valve 48, the gas control valve 49 and the liquid control valve 50 when the temperature reaches a specific temperature point (300 ℃, 350 ℃, 400 ℃, 450 ℃, 500 ℃ and 550 ℃) and keeping constant, collecting oil shale oil and oil shale gas generated by pyrolysis through an oil gas collecting system, then keeping the temperature for 10 hours, closing the generator valve 2, the upstream air chamber valve 9, the downstream air chamber valve 26, the pressure reducing valve 48, the gas control valve 49, the liquid control valve 50, the first pressure gauge valve 14, the second pressure gauge valve 15 and the displacement pump valve 6, opening the gas bottle valve 4, the second valve 45, the backpressure valve 21 and the inert gas control valve 47 of the inert gas without using the hand pump 23 to provide pressure for the backpressure valve 21, and introducing nitrogen to carry out permeability tests of different pore pressures (0.5 MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa and 3 MPa), recording the nitrogen flow Q after the number of the high-precision flowmeter 22 is stable, carrying out the next permeability test under the pore pressure at an interval of twenty minutes, and after the current permeability test at the temperature is finished, continuously heating to the next temperature, and carrying out the permeability test by using the same step in a steady state method.
Further, the permeability test using the in-situ pyrolysis mechanism reaction kettle 12 may be performed using either a steady-state method or a transient-state method, the permeability test using the transient-state method is performed when the loading temperature is lower than 200 ℃, and the permeability test using the steady-state method is performed when the loading temperature is higher than 200 ℃. The loading mode of the axial pressure also depends on the loading temperature, the double-cylinder displacement pump 5 is used for loading the axial pressure when the temperature is lower than 200 ℃, and the press machine is used for loading the axial pressure when the temperature is higher than 200 ℃.
Further, when the in-situ pyrolysis experiment is performed on the organic rock, the heating jacket 46 is used for heating the organic rock sample when the temperature is lower than 200 ℃, and the high-temperature fluid generation system is used for performing the in-situ pyrolysis experiment on the organic rock sample when the temperature is higher than 200 ℃.
It should be noted that, regarding the specific structure of the present invention, the connection relationship between the modules adopted in the present invention is determined and can be realized, except for the specific description in the embodiment, the specific connection relationship can bring the corresponding technical effect, and the technical problem proposed by the present invention is solved on the premise of not depending on the execution of the corresponding software program.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a simulator of organic rock normal position exploitation seepage flow and pyrolysis which characterized in that: the system comprises an in-situ pyrolysis mechanism reaction kettle (12), a high-temperature fluid generation system, a stress application system and an oil-gas collection system, wherein an organic rock sample (40) is arranged in the in-situ pyrolysis mechanism reaction kettle (12), and a heating sleeve (46) is wrapped on the periphery of the in-situ pyrolysis mechanism reaction kettle (12); the high-temperature fluid generation system comprises a high-temperature thermal fluid generator (1), wherein the high-temperature thermal fluid generator (1) is connected with an in-situ pyrolysis mechanism reaction kettle (12) through a pipeline;
the stress applying system comprises a servo hydraulic control frame, a double-cylinder displacement pump (5), a press machine and a confining pressure pump (24), wherein the servo hydraulic control frame fixes the in-situ pyrolysis mechanism reaction kettle (12), the double-cylinder displacement pump (5) is connected with the in-situ pyrolysis mechanism reaction kettle (12) through an upstream pipeline, the confining pressure pump (24) is connected with the in-situ pyrolysis mechanism reaction kettle (12) through a downstream pipeline, and a confining pressure pump valve (18) is arranged on an outlet pipeline of the confining pressure pump (24);
an inert gas cylinder (3) and an upstream gas chamber (8) are further connected to an upstream pipeline of the in-situ pyrolysis mechanism reaction kettle (12), wherein the inert gas cylinder (3) is arranged between the high-temperature thermal fluid generator (1) and the double-cylinder displacement pump (5), the upstream gas chamber (8) is arranged on a pipeline close to the in-situ pyrolysis mechanism reaction kettle (12), a generator valve (2), a gas cylinder valve (4), a displacement pump valve (6) and an upstream gas chamber valve (9) are respectively arranged on outlet pipelines of the high-temperature thermal fluid generator (1), the inert gas cylinder (3), the double-cylinder displacement pump (5) and the upstream gas chamber (8), and a first valve (7), a temperature display meter (10) and a first barometer (11) are arranged on the upstream pipeline of the in-situ pyrolysis mechanism reaction kettle (12);
a third barometer (16) is arranged on a downstream pipeline of the in-situ pyrolysis mechanism reaction kettle (12);
the oil gas collecting system comprises a condenser (20), the condenser (20) is connected with a fluid outlet of the in-situ pyrolysis mechanism reaction kettle (12) through a pipeline, a second valve (45) is arranged on an inlet pipeline of the condenser (20), a back pressure valve (21) is arranged on an outlet pipeline of the condenser (20), a downstream air chamber (19) is further connected on the fluid outlet pipeline of the in-situ pyrolysis mechanism reaction kettle (12), a downstream air chamber valve (26) is arranged on an outlet pipeline of the downstream air chamber (19), and a second barometer (17), a flowmeter (22) and an inert gas control valve (47) are further arranged on the fluid outlet pipeline of the in-situ pyrolysis mechanism reaction kettle (12);
a branch pipeline is further connected to the pipeline between the back pressure valve (21) and the inert gas control valve (47), the tail end of the branch pipeline is connected with two pipelines, namely a gas pipeline and a liquid pipeline, a pressure reducing valve (48) is arranged on the branch pipeline, a gas control valve (49) is arranged on the gas pipeline, and a liquid control valve (50) is arranged on the liquid pipeline;
the system is characterized in that an upstream pipeline of the in-situ pyrolysis mechanism reaction kettle (12) is connected with a fluid outlet pipeline through a branch pipeline, a fourth barometer (13) is arranged on the branch pipeline, a first barometer valve (14) is arranged on the branch pipeline of the upstream pipeline of the fourth barometer (13) connected with the in-situ pyrolysis mechanism reaction kettle (12), and a second barometer valve (15) is arranged on the branch pipeline of the fluid outlet pipeline of the fourth barometer (13) connected with the in-situ pyrolysis mechanism reaction kettle (12).
2. The simulation device for in-situ mining seepage and pyrolysis of organic rock according to claim 1, characterized in that: the back pressure valve (21) is connected with a hand pump (23) through a pipeline.
3. The simulation device for seepage and pyrolysis in situ mining of organic rock as claimed in claim 1, wherein: the upper part of the in-situ pyrolysis mechanism reaction kettle (12) is provided with an axial pressure applying head (28), and the side surface of the axial pressure applying head (28) is provided with a fluid injection port (27) for connecting a high-temperature thermal fluid generator (1) and an inert gas cylinder (3);
the axial pressure applying head (28) is sequentially provided with a pressure transmitting head (29), a first metal clamping ring (30), a second metal clamping ring (31), a pressure transmitting cavity (32), an axial displacement meter (33), a first pressure transmitting cavity liquid inlet (34), a flange (35) at the joint of a pressure transmitting system and the high-temperature and high-pressure resistant long-distance reaction kettle, a second pressure transmitting cavity liquid inlet (36), a first water circulation cooling device (37) and a second water circulation cooling device (38) below, and the flange, the second pressure transmitting cavity liquid inlet, the first water circulation cooling device and the second water circulation cooling device are used for being connected with a stress applying system to realize the switching of different axial pressure loading modes;
a confining pressure injection port (42) on the side surface of the middle part of the in-situ pyrolysis mechanism reaction kettle (12) is connected with a confining pressure pump (24), and high-temperature oil is injected to provide required confining pressure for an experiment;
the side surface of the lower part of the in-situ pyrolysis mechanism reaction kettle (12) is provided with a fluid outlet (44), so that high-temperature hot fluid used for pyrolyzing the organic rock, products produced by pyrolyzing the organic rock and nitrogen or inert gas used for carrying out a permeation experiment are discharged out of the reaction kettle, and the fluid outlet (44) is connected with a condenser (20) through a pipeline.
4. The simulation device for in-situ mining seepage and pyrolysis of organic rock according to claim 3, characterized in that: organic rock sample (40) adopt purple copper cover parcel, and the red copper cover is fixed through metal clamp (41) to the upper and lower extreme is sealed on the red copper cover through first graphite (39), second graphite (43) respectively, makes red copper cover and organic rock sample (40) tightly laminate.
5. The simulation device for in-situ mining seepage and pyrolysis of organic rock according to claim 1, characterized in that: the double-cylinder displacement pump (5) and the confining pressure pump (24) adopt pumps with two working modes of constant flow and constant pressure, the working pressure is 0-50 MPa, the digital display resolution of the pressure is 0.01MPa, and the flow is 0.001-20 mL/min.
6. The simulation device for in-situ mining seepage and pyrolysis of organic rock according to claim 5, characterized in that: the medium in the double-cylinder displacement pump (5) and the confining pressure pump (24) adopts water or oil, wherein the volume of a horizontal bar pump body of the double-cylinder displacement pump (5) is 200ml, the resolution is 0.01ml, and the frequency of liquid injection pressure acquisition for the double-cylinder displacement pump (5) and the confining pressure pump (24) is 10-100 times/second.
7. The simulation device for in-situ mining seepage and pyrolysis of organic rock according to claim 1, characterized in that: the system is characterized by further comprising a control center (25), wherein the control center (25) comprises a PC terminal and a display, the PC terminal is respectively connected with an upstream pipeline, a downstream pipeline, a fluid outlet pipeline and instruments, control valves and driving pumps which are arranged on branch pipelines of the in-situ pyrolysis mechanism reaction kettle (12) through leads, the upstream pipeline, the downstream pipeline, the fluid outlet pipeline and the instruments and valves arranged on the branch pipelines of the in-situ pyrolysis mechanism reaction kettle (12) are all high-temperature and high-pressure resistant devices, the lowest bearing temperature is 600 ℃, and the lowest bearing pressure is 50 MPa.
8. The simulation experiment method for the seepage and pyrolysis in the in-situ mining of the organic rock is carried out by adopting the simulation device for the seepage and pyrolysis in the in-situ mining of the organic rock as claimed in any one of claims 1 to 7, and is characterized in that: the method comprises the following steps:
s1: wrapping a red copper sleeve on a cut organic rock sample (40) with a good size, putting the red copper sleeve into a reaction kettle (12) with an in-situ pyrolysis mechanism, sealing and fixing the red copper sleeve by using a metal hoop (41) and first graphite (39), and ensuring bolts at all positions of the reaction kettle to be screwed down;
s2: opening a displacement pump valve (6) and a surrounding pressure pump valve (18), closing a gas cylinder valve (4) and a generator valve (2) of inert gas, connecting a double-cylinder displacement pump (5) with a first pressure cavity liquid inlet (34), sealing a first metal clamping ring (30) and a second metal clamping ring (31) by using graphite and clamping a bolt, and providing axial pressure and surrounding pressure with set pressure for a massive organic rock sample (40) through the double-cylinder displacement pump (5) and a surrounding pressure pump (24) so as to enable the organic rock sample (40) to reach an in-situ stress state;
s3: an in-situ high-temperature pyrolysis experiment is carried out on an organic rock sample (40), and permeability is tested by a transient method or a steady state method, wherein the pyrolysis temperature of the transient method is lower than 200 ℃, the pyrolysis temperature is reached by heating through a heating sleeve (46), the pyrolysis temperature of the steady state method is higher than 200 ℃, and high-temperature fluid generated by a high-temperature thermal fluid generator (1) is reached to the pyrolysis temperature.
9. The simulation experiment method for in-situ mining seepage and pyrolysis of organic rock as claimed in claim 8, wherein: the concrete steps of the step S3 for testing the permeability by the transient method are as follows:
s3.11: at the moment, the organic rock sample (40) reaches an in-situ stress state, the organic rock sample (40) is sequentially heated to different specified temperatures through a heating sleeve (46), after the temperature is constant, a second valve (45), a back pressure valve (21), a pressure reducing valve (48), a gas control valve (49) and a liquid control valve (50) are opened, organic rock oil and organic rock gas generated by pyrolysis are collected through an oil-gas collecting system, after heat preservation is carried out for a set time, corresponding pore pressures are respectively provided for an upstream air chamber (8) and a downstream air chamber (19), then a first valve (7) and a second valve (45) are closed, an upstream air chamber valve (9), a downstream air chamber valve (26), a first barometer valve (14) and a second barometer valve (15) are opened, a completely airtight environment is constructed, and then gas with pressure difference is provided for passing through the organic rock sample (40) through the upstream air chamber (8) and the downstream air chamber (19), obtaining a correlation curve;
and after the temperature point is tested, continuously heating to the next temperature point until the highest set temperature value, and repeating the process to finish the permeability test by the transient method.
10. The simulation experiment method for in-situ mining seepage and pyrolysis of organic rock as claimed in claim 8, wherein: the specific steps of testing the permeability through the steady state method in the step S3 are as follows:
s3.21: after the pyrolysis experiment and the permeability test of the highest set temperature value are completed, the double-cylinder displacement pump (5) is connected with the liquid inlet (36) of the second pressure transmission cavity, so that the pressure transmission head (29) is pushed back;
s3.22: after the pressure transmission head (29) is pushed back, the first metal clamping ring (30) is detached, the second metal clamping ring (31) is sealed by graphite and clamped by bolts again, and axial pressure and confining pressure with set pressure are provided for the organic rock sample (40) through a press machine and a confining pressure pump (24), so that the organic rock sample (40) reaches the in-situ stress state again;
s3.23: closing the heating sleeve (46), enabling the high-temperature thermal fluid generator (1) to work to generate high-temperature fluid, opening a generator valve (2), closing an inert gas cylinder valve (4) and a displacement pump valve (6), introducing the high-temperature fluid into an organic rock sample (40) through a pipeline through a fluid injection port (27) of an in-situ pyrolysis mechanism reaction kettle (12), and carrying out an in-situ high-temperature pyrolysis experiment on the organic rock sample (40);
s3.24: setting different temperature points according to the indication number of a temperature display meter (10), opening a second valve (45), a back pressure valve (21), a pressure reducing valve (48), a gas control valve (49) and a liquid control valve (50) after the temperature reaches a specific temperature point and is constant, collecting organic rock oil and organic rock gas generated by pyrolysis through an oil-gas collecting system, closing a generator valve (2), an upstream air chamber valve (9), a downstream air chamber valve (26), the pressure reducing valve (48), the gas control valve (49), the liquid control valve (50), a first air pressure gauge valve (14), a second air pressure gauge valve (15) and a displacement pump valve (6) after heat preservation is set for a long time, opening a gas cylinder valve (4), a second valve (45), the back pressure valve (21) and an inert gas control valve (47), and providing pressure for the back pressure valve (21) without using a hand pump (23), and introducing inert gas to carry out different pore pressure permeability tests until the flow meter (22) records the flow Q of the inert gas after the number is stable, carrying out the next pore pressure permeability test at intervals, after the current temperature permeability test is finished, continuing heating to the next temperature, and carrying out the steady state permeability test by using the same steps.
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