CN214174090U - Coal rock anisotropic adsorption expansion and permeability testing device - Google Patents
Coal rock anisotropic adsorption expansion and permeability testing device Download PDFInfo
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- CN214174090U CN214174090U CN202023099927.5U CN202023099927U CN214174090U CN 214174090 U CN214174090 U CN 214174090U CN 202023099927 U CN202023099927 U CN 202023099927U CN 214174090 U CN214174090 U CN 214174090U
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Abstract
The utility model provides a coal rock anisotropic adsorption expansion and permeability testing device, belonging to the field of coal rock performance testing, comprising a box body, a fixed sleeve, an axial cover, a seal sleeve, a gas injection system, a confining pressure control system, an axial pressure control system and a data monitoring and acquisition system; the two opposite side walls of the box body distributed along the preset path are respectively provided with a loading and unloading opening and a box body adjusting cavity; the fixed sleeve is an elastic component and is sleeved on the periphery of the sample along a direction perpendicular to the preset path; the axial cover covers the loading and unloading opening, a clamping cavity is formed between the axial cover and the fixed sleeve, and air passages communicated with the clamping cavity are respectively arranged on the axial covers on the two sides of the clamping cavity; the sealing sleeve is sleeved on the periphery of the fixed sleeve and the axial cover. The utility model provides a coal petrography anisotropic adsorption inflation and permeability testing arrangement can accurately obtain coal petrography adsorption inflation volume and permeability isoparametric in the not equidirectional, finally obtains the calculation result of accurate coal petrography adsorption inflation degree and permeability.
Description
Technical Field
The utility model belongs to the technical field of the coal petrography capability test, more specifically say, relate to a coal petrography anisotropic adsorption inflation and permeability testing arrangement.
Background
Introducing CO2Injecting coal bed realizes CO2The geological sealing reduces the greenhouse effect, realizes the displacement effect of methane in the coal reservoir stratum and improves the extraction rate of the coal bed gas, and the technology has double benefits in the aspects of environment and energy. Due to coal rock to CO2Has a large adsorption capacity of CO2After the coal rock is contacted with a coal matrix, obvious adsorption expansion phenomenon of the coal rock can occur, so that the original pore crack structure of a coal reservoir is changed, and the permeability of the coal rock is finally influenced. The coal rock has a dual pore structure, i.e. gas mainly exists in pores of a coal matrix in an adsorption state and flows in fractures of the coal rock in a free state, and meanwhile, the coal rock also has a widely developed cleat structure which mainly comprises a face cleat and an end cleat which are almost vertical to each other and are vertical to a bedding plane, and the unique structure makes the obvious anisotropic characteristic of the coal rock. CO 22Through macroscopic cracksThe coal enters the cutting process, and is finally adsorbed in the pores of the coal matrix through the cutting process, the whole injection process is a continuous process, and the adsorption expansion amount and the permeability in all directions restrict CO2The implantation of (2). Therefore, the anisotropic adsorption expansion and permeability of the coal rock are measured through an experimental method to reduce CO in the atmosphere2And the strengthening of the exploitation of the coal bed gas has important significance. However, at present, a special device for testing the adsorption expansion and permeability of the coal rock is lacked, so that the testing difficulty is high, and the accuracy is limited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coal petrography anisotropic adsorption inflation and permeability testing arrangement aims at solving and lacks the technical problem who carries out effective, accurate device of testing to the adsorption inflation and the permeability of coal petrography among the prior art.
In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a coal petrography anisotropic adsorption expansion and permeability testing arrangement, includes:
the device comprises a box body, wherein loading and unloading openings are respectively formed in two opposite side walls of the box body, which are distributed along a preset path, and an adjusting cavity for applying confining pressure perpendicular to the preset path to a sample through liquid is formed in the box body;
the fixing sleeve is an elastic component and is sleeved on the periphery of the sample along a direction perpendicular to the preset path;
the axial cover is used for sealing the loading and unloading opening, a clamping cavity for containing the sample is formed between the axial cover and the fixed sleeve, and air passages communicated with the clamping cavity are respectively arranged on the axial covers on two sides of the clamping cavity;
the sealing sleeve is sleeved on the peripheries of the fixed sleeve and the axial cover so as to enable the clamping cavity to be isolated from the adjusting cavity;
the gas injection system is communicated with the gas channel positioned on one side of the clamping cavity;
the confining pressure control system is communicated with the adjusting cavity and is used for providing required confining pressure by injecting liquid into the adjusting cavity;
the axial pressure control system is connected with the axial cover and used for applying axial pressure parallel to the preset path to the sample through the axial cover; and
and the data monitoring and collecting system is used for collecting axial strain data of the sample, radial strain data of the sample, air inlet pressure data, air inlet instantaneous flow data, air outlet pressure data, air outlet instantaneous flow data and accumulated flow data.
As another embodiment of the present application, the axial cover includes:
the cover body is used for being matched with the assembling and disassembling opening in a sealing way; and
and the rigid cushion block is arranged between the cover body and the sample, and the cover body and the rigid cushion block are both provided with the air passages.
As another embodiment of this application, the axial lid still includes ventilative cushion, ventilative cushion locates between rigidity cushion and the sample, ventilative cushion respectively with the both sides of sample reach the both sides contact of fixed cover.
As another embodiment of the present application, a seal ring is disposed on the cover body to be engaged with the mounting/dismounting opening.
As another embodiment of the present application, the axle pressure control system includes:
the output end of the bidirectional hydraulic pump penetrates through the cover body and is connected with the rigid cushion block; and
and the detection end of the axial pressure gauge is arranged between the output end of the bidirectional hydraulic pump and the rigid cushion block.
As another embodiment of the present application, the confining pressure control system includes:
the annular pressure tracking pump is communicated with the adjusting cavity;
the liquid discharge pipe is arranged in the box body and used for discharging liquid in the adjusting cavity; and
the first heater is arranged in the adjusting cavity and used for heating the liquid in the adjusting cavity.
As another embodiment of the present application, the data monitoring and acquisition system includes:
the strain gauge is attached to the outer surface of the test sample and used for sensing the axial strain and the radial strain of the test sample;
the strain collector is in communication connection with the strain gauge;
two first pressure sensors are arranged and are respectively arranged at the air passages on two sides of the clamping cavity; and
and two flow meters are arranged on the air passages on two sides of the clamping cavity respectively.
As another embodiment of the present application, when the specimen is a cubic specimen, the strain gauge is divided into a first strain gauge, a second strain gauge and a third strain gauge; the first strain gauge is attached to the first side face of the test sample and is arranged perpendicular to the preset path; the second strain gauge is attached to the first side face of the sample and arranged in parallel to the preset path; the third strain gauge is attached to a second side surface of the sample, the second side surface is adjacent to the first side surface, and the third strain gauge is perpendicular to the first strain gauge and the second strain gauge.
As another embodiment of the present application, the gas injection system comprises:
detecting a gas cylinder;
a carbon dioxide cylinder;
the booster pump is respectively connected with the detection gas cylinder and the carbon dioxide gas cylinder;
the air inlet of the temporary air storage component is communicated with the booster pump, and the air outlet of the temporary air storage component is communicated with the air passage; and
and the vacuum pump is connected between the air outlet of the temporary air storage assembly and the air passage through a three-way valve.
As another embodiment of the present application, the temporary gas storage assembly includes:
the reference cylinder is provided with a first cavity for storing gas and a second cavity arranged on the periphery of the first cavity, and the first cavity is respectively communicated with the booster pump and the air passage;
the second heater is arranged in the second cavity and used for heating the liquid in the second cavity; and
a second pressure sensor for sensing air pressure within the first chamber.
The utility model provides a coal petrography anisotropic adsorption inflation and permeability testing arrangement's beneficial effect lies in: compared with the prior art, the utility model discloses coal petrography anisotropic adsorption expansion and permeability testing arrangement can make the sample truly simulate axial pressure environment under the environment of relative seal, radial pressure environment and gas injection environment, the sample can not receive liquid pollution in the test process, can accurately obtain coal petrography adsorption expansion volume and permeability isoparametric on the equidirectional not, finally obtain the calculation result of accurate coal petrography absorption expansion degree and permeability, can provide more solid theoretical foundation for coal bed gas development technology, coal bed gas row adopts working system establishment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a coal rock anisotropic adsorption expansion and permeability testing device provided by an embodiment of the present invention;
fig. 2 is a schematic view of an assembly structure of the box body, the fixing sleeve, the axial cover and the sealing sleeve adopted by the embodiment of the invention;
FIG. 3 is a schematic view of the assembly of the sample and strain gage of FIG. 2;
fig. 4 is a left side assembly schematic view of the sample, strain gage and fixture sleeve of fig. 2.
In the figure:
1. a box body;
2. fixing a sleeve;
3. an axial cover; 301. a cover body; 302. a rigid cushion block; 303. a breathable cushion block; 304. a seal ring;
4. sealing sleeves;
5. a gas injection system; 501. detecting a gas cylinder; 502. a carbon dioxide cylinder; 503. a booster pump; 504. a temporary gas storage component; 5041. a reference cylinder; 5042. a second heater; 5043. a second pressure sensor; 5044. a first chamber; 5045. a second chamber; 505. a vacuum pump; 506. a three-way valve;
6. a confining pressure control system; 601. a ring pressure tracking pump; 602. a liquid discharge pipe; 603. a first heater; 604. a third pressure sensor;
7. a shaft pressure control system; 701. a bidirectional hydraulic pump; 702. an axial pressure gauge;
8. a data monitoring and acquisition system; 801. a strain collector; 802. a first pressure sensor; 803. a flow meter; 804. a first strain gauge; 805. a second strain gauge; 806. a third strain gauge;
9. a sample;
10. an adjustment chamber;
11. an airway;
12. a control cabinet;
13. a horizontal valve;
14. a pressure regulating valve;
15. a pneumatic valve.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that "axial" in the present application refers to a direction parallel to the preset path, "radial" refers to a direction perpendicular to the preset path, and "confining pressure" refers to a radial pressure.
Referring to fig. 1 and fig. 2, the coal rock anisotropic adsorption expansion and permeability testing apparatus provided by the present invention will now be described. The coal rock anisotropic adsorption expansion and permeability testing device comprises a box body 1, a fixed sleeve 2, an axial cover 3, a seal sleeve 4, a gas injection system 5, a confining pressure control system 6, an axial pressure control system 7 and a data monitoring and acquisition system 8; loading and unloading openings are respectively formed in two opposite side walls of the box body 1 distributed along the preset path, and an adjusting cavity 10 for applying confining pressure perpendicular to the preset path to the sample 9 through liquid is formed in the box body 1; the fixed sleeve 2 is an elastic component, and the fixed sleeve 2 is sleeved on the periphery of the sample 9 along a direction perpendicular to the preset path; the axial cover 3 is used for sealing the assembling and disassembling opening, a clamping cavity for containing a sample is formed between the axial cover 3 and the fixed sleeve 2, and air passages 11 communicated with the clamping cavity are respectively arranged on the axial covers 3 at two sides of the clamping cavity; the sealing sleeve 4 is sleeved on the peripheries of the fixed sleeve 2 and the axial cover 3 so as to isolate the clamping cavity from the adjusting cavity 10; the gas injection system is communicated with a gas passage 11 positioned on one side of the clamping cavity; the confining pressure control system 6 is communicated with the regulating cavity 10, and provides the required confining pressure by injecting liquid into the regulating cavity 10; the axial pressure control system 9 is connected to the axial cover 3 and is used for applying axial pressure parallel to a preset path to the test sample 9 through the axial cover 3; the data monitoring and collecting system 8 is used for collecting axial strain data of the sample, radial strain data of the sample, air inlet pressure data, air inlet instantaneous flow data, air outlet pressure data and air outlet instantaneous flow data.
The direction of the arrows in fig. 1 is the direction of gas flow.
Wherein, the sealing sleeve 4 is tightly attached to the gap between the axial cover 3 and the fixed sleeve 2 to realize the relative isolation of the clamping cavity and the adjusting cavity 10.
The utility model provides a coal petrography anisotropic adsorption expansion and permeability testing arrangement is through the cooperation of fixed cover 2 and axial lid 3, carry out effectual rigidity to sample 9, and exert axial pressure (axle pressure) to sample 9 through axle pressure control system 7, inject into liquid and exert radial pressure (confining pressure) to sample 9 through confining pressure control system 6 in adjusting the intracavity, because seal cover 4 and fixed cover 5 are elastic component, the confining pressure can even effectual transmission to sample 9, and because axial lid 3 can direct contact sample 9, the axle pressure also can effectively be transmitted to sample 9, seal cover 4 of suit plays the important function to keeping the centre gripping chamber for the leakproofness of adjusting chamber 10 afterwards, prevent that sample 9 from receiving the pollution of adjusting intracavity 10 interior liquid. The data monitoring and collecting system 8 can collect axial strain data of the sample 9 and radial strain data of the sample so as to obtain the expansion change degree of the sample, and can also collect inlet air pressure data, inlet instantaneous flow data, outlet air pressure data, outlet instantaneous flow data and accumulated flow data so as to calculate the permeability; if the absorption expansion and permeability in other directions need to be tested, the fixing sleeve 2 and the sample 9 are taken out, the relative position of the sample 9 and the fixing sleeve 2 is changed, and then the test is carried out again.
Compared with the prior art, the utility model provides a coal petrography anisotropic adsorption expansion and permeability testing arrangement can make the sample truly simulate axial pressure environment under the environment of relative seal, radial pressure environment and gas injection environment, sample 9 can not receive liquid pollution in the testing process, can accurately obtain coal petrography adsorption expansion volume and permeability isoparametric on the equidirectional, finally obtain the calculation result of accurate coal petrography absorption expansion degree and permeability, can provide more solid theoretical foundation for coal bed gas development technology, the working system establishment is adopted to the coal bed gas row. In addition, the coal rock anisotropic adsorption expansion and permeability testing device is simple to operate, data are concise, a complex calculation process is not needed, and the experiment efficiency is greatly improved.
Specifically, referring to fig. 1, the coal rock anisotropic adsorption expansion and permeability testing apparatus further includes a control cabinet 12, and the control cabinet 12 is respectively in communication connection with the gas injection system 5, the confining pressure control system 6, the axial pressure control system 7 and the data monitoring and collecting system 8, and can store various data and commands, thereby realizing automatic control of monitoring and operation.
Specifically, the fixing sleeve 2 is a cylindrical member, a through hole matched with the appearance size of the sample 9 is reserved in the middle of the fixing sleeve to realize the sleeving and fixing of the sample 9, the thickness of the fixing sleeve 2 is consistent with that of the sample 9, and two side faces of the sample 9 after being assembled are respectively flush with two side faces of the fixing sleeve 2.
As a specific embodiment of the coal rock anisotropic adsorption expansion and permeability testing apparatus provided by the present invention, please refer to fig. 1 and 2, the axial cover 3 includes a cover body 301 and a rigid cushion block 302; the cover body 301 is used for sealing and matching with the assembling and disassembling opening; rigid pad 302 is disposed between cover 301 and sample 9, and can contact with sample 9 to transmit axial pressure, air channel 11 is disposed on both cover 301 and rigid pad 302, and actually, air channel 11 is formed by through holes disposed on cover 301 and rigid pad 302. The pressure output end of the axial pressure control system 7 can penetrate through the cover body 301 and is connected with the rigid cushion block 302, and the purpose of applying axial pressure is achieved by pushing the rigid cushion block 302.
Specifically, the rigid spacer 302 is a metal member.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 and fig. 2, the axial cover 3 further includes a ventilation pad 303, the ventilation pad 303 is disposed between the rigid pad 302 and the sample 9, and the ventilation pad 303 is respectively in contact with two sides of the sample 9 and two sides of the fixing sleeve 2. The gas permeable cushion block 303 is made of metal and comprises a large number of holes inside, on one hand, the gas permeable cushion block 303 bears axial pressure, on the other hand, gas is allowed to pass through, and gas is provided for adsorption expansion and permeability test of a sample; meanwhile, gas can be dispersed through the gas permeable cushion block 303, and the gas injection efficiency is further improved.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 and fig. 2, the cover 301 is provided with a sealing ring 304 cooperating with the loading and unloading opening, so that the sealing performance between the cover 301 and the loading and unloading opening can be improved, water leakage at the loading and unloading opening can be avoided, and the constant confining pressure can be ensured.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, the axle pressure control system 7 includes a bidirectional hydraulic pump 701 and an axial pressure gauge 702; the output end of the bidirectional hydraulic pump 701 penetrates through the cover body 301 and is connected with the rigid cushion block 3032; the detection end of the axial pressure gauge 702 is arranged between the output end of the bidirectional hydraulic pump 701 and the rigid cushion block 302. The bidirectional hydraulic pump 701 is a manual hydraulic pump, axial pressure required in an experimental process is provided through manual operation, and operation in an adjusting process is simple. The axial pressure gauge 702 can accurately display the axial pressure value, so that an experimenter can accurately master the pressure application condition.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, the confining pressure control system 6 includes a ring pressure tracking pump 601, a liquid discharge pipe 602 and a first heater 603; the ring pressure tracking pump 601 is communicated with the adjusting cavity 10; the drain pipe 602 is arranged in the box body 1 and used for draining the liquid in the regulating cavity 10 when the confining pressure value exceeds a preset value; the first heater 603 is disposed in the conditioning chamber 10 for heating the liquid in the conditioning chamber 10.
The ring pressure tracking pump 601 provides the required confining pressure by injecting liquid (generally water) into the adjusting cavity 10, and a dial plate capable of controlling and displaying the real-time confining pressure is arranged on the ring pressure tracking pump 601, so that an experimenter can accurately master the pressure applying condition. The first heater 603 heats the liquid in the conditioning chamber 10 to realize constant temperature water bath heating and provide a constant test temperature for the sample, so as to simulate real bottom conditions.
Specifically, the drain pipe 602 is provided with a horizontal valve 13, and the opening of the horizontal valve 13 can discharge the confining pressure by discharging the water in the regulating chamber 10.
According to the embodiment, the axial pressure is applied through the bidirectional hydraulic pump 701, the confining pressure is provided by injecting water into the adjusting cavity 10 through the annular pressure tracking pump 601, the control operation of the axial pressure and the confining pressure is simple, and the regulating and controlling effect is reliable.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 to 4, the data monitoring and collecting system 8 includes a strain gauge, a strain collector 801, a first pressure sensor 802 and a flow meter 803; the strain gauge is attached to the outer surface of the test sample 9 and used for sensing the axial strain and the radial strain of the test sample 9; the strain acquisition device 801 is in communication connection with the strain gauge and is used for acquiring various strain data; the number of the first pressure sensors 802 is two, and the two first pressure sensors 802 are respectively arranged at the air passages 11 positioned at two sides of the clamping cavity and can collect air inlet pressure and air outlet pressure; the flow meters 803 are two, and the two flow meters 803 are respectively arranged at the air passages 11 at two sides of the clamping cavity. The strain collector 801 is in communication connection with the control cabinet 12, the strain collector 801 converts resistance signals transmitted by the strain gauge into data signals and can display the data signals on the control cabinet 12, the temperature and the pressure of the whole device are controlled by the control cabinet 12, and meanwhile, temperature and pressure data are automatically recorded in the control cabinet 12.
In this embodiment, because of the 4-position elastic member of the sealing sleeve, a certain space is extended between the ventilation cushion block 303 and the sealing sleeve 4 and between the rigid cushion block 302 and the sealing sleeve 4, so that the wire of the strain gauge can pass through the space, and the cover 301 is provided with a wire groove, and the wire can be led out of the cover 301 through the wire groove, and then the wire is led out to be electrically connected with the external strain collector 801. In order to ensure the sealing performance and the smooth sample loading of the sealing sleeve 4, the guide diameter needs to be as small as possible, and a 0.7mm lead can be adopted.
The sample 9 mentioned in the application is a cubic sample, and can be a cubic coal sample of 3 x 3cm, so that the anisotropic permeability and the adsorption expansion test of the coal rock can be performed on the same sample 9, the operation steps are simplified, and meanwhile, the accuracy and the repeatability of experimental data can be ensured. The cubic coal sample is obtained by cutting collected large coal blocks or drilled full-diameter coal cores, and the surface of the cubic coal sample is polished smoothly by using 240-mesh, 600-mesh and 1200-mesh abrasive papers respectively, so that a sample is prevented from crushing a rubber sleeve or breaking a high-precision strain gage wire in the experimental process.
On the basis of the cubic test sample 9, the through hole on the fixing sleeve 2 is a square hole with the diameter of 3 multiplied by 3cm, the outer diameter of the fixing sleeve 2 is 5cm, and the thickness is 3 cm. Fixed cover 2 can adopt the silicon rubber material, and silicon rubber has certain pliability, and under the effect of confined pressure after the cubic sample installation, sample and fixed cover 2 closely laminate can guarantee the gas tightness and can not press the wire on the rupture foil gauge again, can guarantee to adsorb going on smoothly of inflation and permeability test.
The fixing sleeve 2 can be manufactured by a 3D printer and can also be prepared by a pouring method, and the pouring steps are as follows:
(1) selecting a plastic pipe with the inner diameter of 5cm and the thickness of 4cm, and paving a layer of preservative film inside the plastic pipe to prevent the silicon rubber from being adhered on the plastic pipe;
(2) wrapping a layer of preservative film on the polished and flat cubic sample, placing the preservative film in the center of the plastic pipe, and pouring silicon rubber into a gap between the cubic sample and the plastic pipe;
(3) compacting the end part of the silicon rubber mould, placing the silicon rubber mould in a constant temperature box, and processing the edge of the silicon rubber mould to be smooth after the silicon rubber mould is completely solidified, so that the fixed sleeve 2 for testing the rock anisotropic adsorption expansion and permeability is prepared.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 to 4, when the sample 9 is a cubic sample, the strain gauge is divided into a first strain gauge 804, a second strain gauge 805 and a third strain gauge 806; the first strain gauge 804 is attached to a first side surface of the test sample 9, is arranged perpendicular to the preset path, and can sense radial strain in one direction; the second strain gauge 805 is attached to the first side surface of the test sample 9, is arranged in parallel to the preset path, and can sense axial strain; a third strain gage 806 is attached to a second side of the test specimen 9, the second side being adjacent to the first side, the third strain gage 806 being perpendicular to the first strain gage 804 and the second strain gage 805, and being capable of sensing radial strain in another direction. The first strain gauge 804, the second strain gauge 805 and the third strain gauge 806 are matched, so that the strain in multiple directions can be sensed, and the test requirements on the strain in different directions are met.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, the gas injection system 5 includes a detecting gas cylinder 501, a carbon dioxide gas cylinder 502, a booster pump 503, a temporary gas storage component 504 and a vacuum pump 505; the booster pump 503 is respectively connected with the detection gas cylinder 501 and the carbon dioxide gas cylinder 502; the air inlet of the temporary air storage component 504 is communicated with the booster pump 503, and the air outlet is communicated with the air passage 11; the vacuum pump 505 is connected between the air outlet of the temporary air storage assembly 504 and the air duct 11 through a three-way valve 506, and can vacuumize the air path of the whole device.
The detection gas cylinder 501 is filled with helium, the helium is mainly used as a detection gas for permeability test, and the carbon dioxide is mainly used for carrying out coal rock adsorption expansion test; the booster pump 503 can boost the pressure of the injected gas to 90MPa at most; the capacity of the temporary gas storage component 504 can reach 5000ml, continuous high-pressure gas can be provided for adsorption expansion and permeability test, and the continuous and stable gas injection process is ensured.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1, the temporary gas storage assembly 504 includes a reference cylinder 5041, a second heater 5042, and a second pressure sensor 5043; the reference cylinder 5041 has a first chamber 5044 for storing gas and a second chamber 5045 provided at the periphery of the first chamber 5044, the first chamber 5044 being communicated with the booster pump 503 and the air passage 11, respectively; a second heater 5042 disposed in the second chamber 5045 for heating the liquid in the second chamber 5045; the second pressure sensor 5043 is for sensing air pressure within the first cavity 5044. The second pressure sensor 5043 is used for monitoring the pressure of the gas, the accuracy can reach 0.01MPa, the second heater 5042 is used for controlling the temperature of the gas in the reference cylinder 5041, the accuracy is 0.01 ℃, and the real reservoir conditions can be simulated.
Specifically, the air inlet and the air outlet of the reference cylinder 5041 are both provided with pneumatic valves 15, and the pneumatic valves 15 are in communication connection with the control cabinet 12, so that the automatic control of the pneumatic valves 15 can be realized; the reference cylinder 5041 is also provided with a pressure regulating valve 14 at the gas inlet and the gas outlet, respectively, for regulating the pressure of the injected gas, thereby accurately realizing constant pressure injection of the gas.
The operation process specifically comprises the following steps:
1) attaching a prepared sample 9 to a first strain gauge 804, a second strain gauge 805 and a third strain gauge 806 respectively, installing the sample in a fixed sleeve 2 according to a first specified direction, then installing a cover body 301, a rigid cushion block 302, a breathable cushion block 303, the fixed sleeve 2 and a sealing sleeve 4 in a box body 1 according to a certain sequence, and in the installation process, a lead passes through a gap between the fixed sleeve 2 and the rigid cushion block 302, the breathable cushion block 303 and a lead groove in the cover body 301, and then is led out of the box body 1;
2) the ring pressure tracking pump 601 is started, water is injected into the sample adjusting cavity 10 to apply confining pressure, the water temperature is controlled through the first heater 603, meanwhile, the bidirectional hydraulic pump 701 is manually adjusted to apply axial pressure to the sample 9, and the confining pressure and the axial pressure are applied alternately in a circulating mode, so that the sample 9 can be prevented from being damaged in the experimental process;
3) opening a vacuum pump 505 to vacuumize the device pipeline, checking the air tightness of the device, and performing the next test if the air tightness is good;
4) opening a detection gas cylinder 501 and a booster pump 503, injecting high-pressure gas into a reference cylinder 5041, controlling the gas temperature through a second heater 5042, then opening a pneumatic valve 15 at the outlet end of the reference cylinder 5041 and a horizontal valve 13 at an air passage 11 for air inlet, and injecting helium with certain pressure into the air passage 11 through a pressure regulating valve 14 at the air passage 11, wherein a first pressure sensor 802 and a flow meter 803 corresponding to the air passage 11 respectively monitor the gas pressure and the instantaneous flow of the air inlet;
5) opening a horizontal valve 13 at the gas outlet passage 11, respectively monitoring the gas pressure and the instantaneous flow of the gas outlet by a first pressure sensor 802 and a flow meter 803 corresponding to the gas outlet passage 11, and calculating the permeability through Darcy's law;
6) after the step 5) is finished, discharging helium in the device, vacuumizing the device through a vacuum pump 505, and repeating the step 4) to inject carbon dioxide with certain pressure into the air inlet air channel 11, wherein the pressure of the carbon dioxide cannot be greater than the confining pressure and the axial pressure, otherwise, gas leakage and sealing failure can be caused;
7) monitoring the strain of the sample 9 by using a strain gauge to obtain adsorption expansion deformation data;
8) 7) after the step 7), completing the permeability and adsorption expansion test in one direction, and discharging carbon dioxide in the device;
9) the fixing sleeve 2 containing the sample 9 is detached, the sample 9 is taken out of the fixing sleeve 2, then the sample 9 is installed in the fixing sleeve 2 along the other direction by rotating, and the steps 3) -8) are repeated, and finally the three-way permeability and adsorption expansion experiment of the coal rock is completed.
Compared with the prior art, the test device can test the anisotropic permeability and the adsorption swelling capacity of the same sample, and is compared with the three-way permeability of a coal bed which needs to be tested by drilling three samples in the conventional device, so that the test device is simple to operate, high in execution efficiency and high in test precision. Meanwhile, the device can control axial pressure, confining pressure and temperature, so that the adsorption expansion and permeability characteristics of the coal bed in all directions under the real stratum condition can be simulated.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Coal petrography anisotropic adsorption expansion and permeability testing arrangement, its characterized in that includes:
the device comprises a box body, wherein loading and unloading openings are respectively formed in two opposite side walls of the box body, which are distributed along a preset path, and an adjusting cavity for applying confining pressure perpendicular to the preset path to a sample through liquid is formed in the box body;
the fixing sleeve is an elastic component and is sleeved on the periphery of the sample along a direction perpendicular to the preset path;
the axial cover is used for sealing the loading and unloading opening, a clamping cavity for containing the sample is formed between the axial cover and the fixed sleeve, and air passages communicated with the clamping cavity are respectively arranged on the axial covers on two sides of the clamping cavity;
the sealing sleeve is sleeved on the peripheries of the fixed sleeve and the axial cover so as to enable the clamping cavity to be isolated from the adjusting cavity;
the gas injection system is communicated with the gas channel positioned on one side of the clamping cavity;
the confining pressure control system is communicated with the adjusting cavity and is used for providing required confining pressure by injecting liquid into the adjusting cavity;
the axial pressure control system is connected with the axial cover and used for applying axial pressure parallel to the preset path to the sample through the axial cover; and
and the data monitoring and collecting system is used for collecting axial strain data of the sample, radial strain data of the sample, air inlet pressure data, air inlet instantaneous flow data, air outlet pressure data, air outlet instantaneous flow data and accumulated flow data.
2. The apparatus for anisotropic adsorptive expansion and permeability of coal and rock according to claim 1, wherein said axial cap comprises:
the cover body is used for being matched with the assembling and disassembling opening in a sealing way; and
and the rigid cushion block is arranged between the cover body and the sample, and the cover body and the rigid cushion block are both provided with the air passages.
3. The coal rock anisotropic adsorption expansion and permeability test device of claim 2, wherein the axial cover further comprises a gas permeable cushion block, the gas permeable cushion block is arranged between the rigid cushion block and the sample, and the gas permeable cushion block is respectively contacted with two sides of the sample and two sides of the fixed sleeve.
4. The coal rock anisotropic adsorption expansion and permeability testing device of claim 2, wherein a sealing ring matched with the loading and unloading opening is arranged on the cover body.
5. The coal rock anisotropic adsorption expansion and permeability test device of claim 2, wherein the axial pressure control system comprises:
the output end of the bidirectional hydraulic pump penetrates through the cover body and is connected with the rigid cushion block; and
and the detection end of the axial pressure gauge is arranged between the output end of the bidirectional hydraulic pump and the rigid cushion block.
6. The coal rock anisotropic adsorption expansion and permeability testing device of claim 1, wherein the confining pressure control system comprises:
the annular pressure tracking pump is communicated with the adjusting cavity;
the liquid discharge pipe is arranged in the box body and used for discharging liquid in the adjusting cavity; and
the first heater is arranged in the adjusting cavity and used for heating the liquid in the adjusting cavity.
7. The coal rock anisotropic adsorption swelling and permeability test device of claim 1, wherein the data monitoring and acquisition system comprises:
the strain gauge is attached to the outer surface of the test sample and used for sensing the axial strain and the radial strain of the test sample;
the strain collector is in communication connection with the strain gauge;
two first pressure sensors are arranged and are respectively arranged at the air passages on two sides of the clamping cavity; and
and two flow meters are arranged on the air passages on two sides of the clamping cavity respectively.
8. The coal rock anisotropic adsorption swelling and permeability testing device according to claim 7, wherein when the sample is a cubic sample, the strain gauge is divided into a first strain gauge, a second strain gauge and a third strain gauge; the first strain gauge is attached to the first side face of the test sample and is arranged perpendicular to the preset path; the second strain gauge is attached to the first side face of the sample and arranged in parallel to the preset path; the third strain gauge is attached to a second side surface of the sample, the second side surface is adjacent to the first side surface, and the third strain gauge is perpendicular to the first strain gauge and the second strain gauge.
9. The coal rock anisotropic adsorption expansion and permeability test apparatus according to claim 1, wherein the gas injection system comprises:
detecting a gas cylinder;
a carbon dioxide cylinder;
the booster pump is respectively connected with the detection gas cylinder and the carbon dioxide gas cylinder;
the air inlet of the temporary air storage component is communicated with the booster pump, and the air outlet of the temporary air storage component is communicated with the air passage; and
and the vacuum pump is connected between the air outlet of the temporary air storage assembly and the air passage through a three-way valve.
10. The coal rock anisotropic adsorption swelling and permeability test device of claim 9, wherein the temporary gas storage assembly comprises:
the reference cylinder is provided with a first cavity for storing gas and a second cavity arranged on the periphery of the first cavity, and the first cavity is respectively communicated with the booster pump and the air passage;
the second heater is arranged in the second cavity and used for heating the liquid in the second cavity; and
a second pressure sensor for sensing air pressure within the first chamber.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136863A (en) * | 2021-12-15 | 2022-03-04 | 石家庄铁道大学 | Sandstone uranium ore permeability testing device |
| CN115405286A (en) * | 2022-08-16 | 2022-11-29 | 中国石油大学(华东) | Measuring device and measuring method for anisotropic reservoir stress sensitivity |
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2020
- 2020-12-21 CN CN202023099927.5U patent/CN214174090U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136863A (en) * | 2021-12-15 | 2022-03-04 | 石家庄铁道大学 | Sandstone uranium ore permeability testing device |
| CN115405286A (en) * | 2022-08-16 | 2022-11-29 | 中国石油大学(华东) | Measuring device and measuring method for anisotropic reservoir stress sensitivity |
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