CN110530771B - Pressure chamber for coal rock sample gas seepage test - Google Patents

Pressure chamber for coal rock sample gas seepage test Download PDF

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Publication number
CN110530771B
CN110530771B CN201910824244.4A CN201910824244A CN110530771B CN 110530771 B CN110530771 B CN 110530771B CN 201910824244 A CN201910824244 A CN 201910824244A CN 110530771 B CN110530771 B CN 110530771B
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CN
China
Prior art keywords
sleeve
pressure
steel cylinder
pressing sleeve
round steel
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CN201910824244.4A
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Chinese (zh)
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CN110530771A (en
Inventor
张东明
王浩
郑东
张邦安
蒋志刚
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重庆大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
    • G01M3/3236Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
    • G01M3/3272Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • G01N15/0826Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Abstract

The invention discloses a pressure chamber for a coal rock sample gas seepage test, which comprises a round steel cylinder, an annular pressure transmission sleeve, T-shaped end sockets, a PEEK sleeve, a conical steel sleeve, a right piston sleeve, a right first pressure sleeve, a right second pressure sleeve, a left first pressure sleeve and a left second pressure sleeve, wherein a cylindrical coal rock sample cavity is formed between the annular pressure transmission sleeve and the two T-shaped end sockets, and an annular pressure application cavity is formed between the annular pressure transmission sleeve and the round steel cylinder; the lateral wall of the round steel cylinder is provided with two annular high-pressure liquid interfaces, the lateral wall of the right second pressing sleeve is provided with two axial high-pressure liquid interfaces, and two T-shaped sealing heads are respectively provided with a seepage high-pressure gas and PEEK insulating joint shared interface of the resistivity measuring instrument. The test device can simulate the gas seepage condition of the coal rock sample under the underground real conditions of different pressures, different temperatures, underground waves and the like more truly, so that the test result has higher practical guiding significance, and reliable guarantee is provided for the safe exploitation of the coal rock stratum.

Description

Pressure chamber for coal rock sample gas seepage test

Technical Field

The invention belongs to the technical field of coal rock sample gas seepage test equipment, and particularly relates to a pressure chamber structure for performing a gas seepage test on a coal rock sample.

Background

Gas seepage refers to the flow of gas in a porous medium. Gas seepage is fundamentally different from liquid seepage in that gas has large compressibility, and volume changes with temperature and pressure during seepage. At present, in a laboratory, a test piece box is commonly used for simulating seepage tests of various gases in a coal rock sample (a general term for the coal sample and the rock sample), but the test conditions of the existing test piece box are relatively limited, and the underground real conditions of the coal rock sample under the influences of factors such as different pressures, different temperatures and underground waves cannot be truly simulated.

Disclosure of Invention

Aiming at the limitation that the current test piece box simulates the seepage test of various gases in a coal rock sample, the invention provides the pressure chamber special for the coal rock sample seepage determination test, and the gas seepage condition of the coal rock sample under underground real conditions of different pressures, different temperatures, underground waves and the like can be simulated more truly. .

Therefore, the technical scheme adopted by the invention is as follows: a pressure chamber for a coal rock sample gas seepage test comprises a round steel cylinder, and further comprises a circumferential pressure transmission sleeve, T-shaped seal heads, PEEK sleeves, a conical steel sleeve, a right piston sleeve, a right first pressing sleeve, a right second pressing sleeve, a left first pressing sleeve and a left second pressing sleeve, wherein the circumferential pressure transmission sleeve is arranged in the round steel cylinder, the outer diameter of the circumferential pressure transmission sleeve is smaller than the inner diameter of the round steel cylinder, the two T-shaped seal heads are oppositely arranged in the circumferential pressure transmission sleeve at intervals left and right, one PEEK sleeve is sleeved on each rod part of each T-shaped seal head, the diameters of the left end part and the right end part of the circumferential pressure transmission sleeve are increased, and the PEEK sleeves are tightly sealed through a conical steel sleeve combined sealing check ring, so that a cylindrical coal rock sample cavity is formed between the circumferential pressure transmission sleeve and the round steel cylinder, and a circumferential pressure applying cavity is formed between the circumferential pressure transmission sleeve and the round steel cylinder; the left first pressing sleeve is screwed at the left end of the round steel cylinder and abuts against the left conical steel sleeve, and the front end of the left second pressing sleeve is screwed in the left first pressing sleeve and abuts against the left PEEK sleeve through a circumferential cushion block; the right first pressing sleeve is in threaded connection with the right end of the round steel cylinder and abuts against the conical steel sleeve on the right side, the right second pressing sleeve is fixedly arranged behind the right first pressing sleeve, the right piston sleeve penetrates through the right second pressing sleeve and the right first pressing sleeve and abuts against the PEEK sleeve on the right side, the middle of the right piston sleeve is provided with an annular bulge and can slide left and right in the large inner diameter section of the right second pressing sleeve, and the interface of the large inner diameter section and the small inner diameter section of the right second pressing sleeve is used as a right movement termination limiting surface of the right piston sleeve;

the lateral wall of the round steel cylinder is provided with two annular high-pressure liquid interfaces, the lateral wall of the right second pressing sleeve is provided with two axial high-pressure liquid interfaces, and two T-shaped sealing heads are respectively provided with a seepage high-pressure gas and PEEK insulating joint shared interface of the resistivity measuring instrument.

Preferably, the side wall of the round steel cylinder is provided with an annular pressure sensor mounting hole, the side wall of the right second pressing sleeve is provided with an axial pressure sensor mounting hole, and the axial pressure sensor mounting hole and the axial high-pressure liquid interface are respectively positioned at the left side and the right side of the annular bulge; the middle part of the outer side wall of the round steel cylinder is locally flattened to be used as an installation platform of the ultrasonic generator, and the inlet of the left end of the pressure chamber is connected with a vibrator. The annular pressure of the coal rock sample of the pressure chamber is detected through an annular pressure sensor, the axial pressure sensor is used for measuring the axial pressure of the coal rock sample of the pressure chamber, and the setting position of a pressure acquisition point can ensure the reality and reasonability of the acquired data; an ultrasonic generator is additionally arranged, high-pressure gas seepage tests under different sound wave conditions can be carried out, and the influence of the gas seepage on the coal rock sample micro cracks under the ultrasonic wave conditions is simulated; the method is characterized in that a vibrator is additionally arranged, air is used as a power source, the influence of gas seepage on the macroscopic cracks of the coal rock sample under different underground wave conditions is simulated, transverse waves generated by the vibrator are large in amplitude, for example, about 10HZ, and the vibrator is used for simulating the macroscopic cracks of the underground waves on the coal rock sample; the arrangement positions of the ultrasonic generator and the vibrator are optimized to simulate the coupling action in two directions, so that the test result is closer to the underground real condition.

Preferably, the high-pressure seepage gas pipe and the high-pressure liquid pipe which are connected with the pressure chamber are flexible pipes, and the pressure chamber is arranged in a warm water bath. The water temperature can be adjusted according to the conditions, and gas seepage tests at different temperatures can be carried out.

Preferably, the left end of the pressure chamber is sequentially connected with the pressure sensor, the high-pressure valve and the carbon dioxide gas source through pipelines, and the right end of the pressure chamber is sequentially connected with the pressure sensor, the high-pressure valve, the drying agent and the gas flowmeter through pipelines and used for performing an effect test of carbon dioxide displacement methane under different gas pressures.

Further preferably, support legs are arranged below the round steel cylinder, so that the round steel cylinder is convenient to operate and observe.

The invention has the beneficial effects that: the test device can simulate the gas seepage condition of the coal rock sample under the underground real conditions of different pressures, different temperatures, underground waves and the like more truly, so that the test result has higher practical guiding significance, and reliable guarantee is provided for the safe exploitation of the coal rock stratum.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a diagram of the present invention for performing carbon dioxide displacement of methane at different gas pressures.

Detailed Description

The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:

referring to fig. 1 and 2, the pressure chamber for the coal rock sample gas seepage test mainly comprises a round steel cylinder 1, a circumferential pressure transmission sleeve 2, a T-shaped end socket 3, a PEEK sleeve 4, a tapered steel sleeve 5, a right piston sleeve 6, a right first pressing sleeve 7, a right second pressing sleeve 8, a left first pressing sleeve 9, a left second pressing sleeve 10, a circumferential cushion block 11, a sealing retainer ring 12, support legs 13, a pressure sensor 14, a high-pressure valve 15, a carbon dioxide gas source 16, a drying agent 17, a gas flowmeter 18, a vibrator 19 and an ultrasonic generator 20.

The annular pressure transmission sleeve 2 is arranged in the round steel cylinder 1, and the outer diameter of the annular pressure transmission sleeve 2 is smaller than the inner diameter of the round steel cylinder 1. Two T type head 3 are installed in annular pressure transmission cover 2 about the interval ground relatively, and the big head end of two T type head 3 is relative, and every T type head 3's pole portion respectively overlaps and is equipped with a PEEK cover 4. The diameters of the left end part and the right end part of the hoop pressure transmission sleeve 2 are increased and are tightly supported and sealed by combining the sealing check ring 12 through the conical steel sleeve 5, so that a cylindrical coal rock sample cavity A is formed between the hoop pressure transmission sleeve 2 and the two T-shaped seal heads 3, and a hoop pressure application cavity B is formed between the hoop pressure transmission sleeve 2 and the round steel cylinder 1. Coal rock sample chamber A and hoop pressure apply chamber B and are seal chamber, and coal rock sample chamber A is used for placing columniform coal sample or rock specimen, and hoop pressure applies chamber B and is used for applying hoop pressure to coal sample or rock specimen, and hoop pressure transmission cover 2 adopts the rubber material, can warp and exert pressure.

The left first pressing sleeve 9 is screwed at the left end of the round steel cylinder 1 and abuts against the left conical steel sleeve 5, and the front end of the left second pressing sleeve 10 is screwed in the left first pressing sleeve 9 and abuts against the left PEEK sleeve 4 through the annular cushion block 11.

The right first pressing sleeve 7 is in threaded connection with the right end of the round steel cylinder 1 and abuts against the conical steel sleeve 5 on the right side, the right second pressing sleeve 8 is fixedly arranged behind the right first pressing sleeve 7, and the right piston sleeve 6 penetrates through the right second pressing sleeve 8 and the right first pressing sleeve 7 and abuts against the PEEK sleeve 4 on the right side. The right second pressing sleeve 8 is divided into a large inner diameter section and a small inner diameter section, the middle part of the right piston sleeve 6 is provided with a circumferential bulge 6a and can slide left and right in the large inner diameter section of the right second pressing sleeve 8, the interface of the large inner diameter section and the small inner diameter section of the right second pressing sleeve 8 is used as a right movement stop limiting surface of the right piston sleeve 6, and the right piston sleeve 6 moves right until the right piston sleeve abuts against the interface of the large inner diameter section and the small inner diameter section.

Be provided with two rings direction high pressure liquid interface a on the lateral wall of cylinder 1, one advances one and goes out, for the ring direction pressure exerts the chamber B and injects high pressure liquid in to apply ring direction pressure to the coal petrography appearance through ring direction pressure transmission cover 2, also be used for before the experiment water injection detection test equipment whether have the leakage. Two axial high-pressure liquid ports b (one of which is not shown) are arranged on the side wall of the right second pressing sleeve 8, one is arranged in and the other is arranged out, and are used for injecting high-pressure liquid into the small inner diameter section of the right second pressing sleeve 8 and applying axial pressure to the coal rock sample through the right piston sleeve 6. The two T-shaped end sockets 3 are respectively provided with a joint shared by seepage high-pressure gas and a PEEK insulating joint of the resistivity measuring instrument, can be used as a socket of the PEEK insulating joint of the resistivity measuring instrument and a socket of seepage high-pressure gas, firstly, a seepage gas test is carried out, the socket of the high-pressure gas is taken down after the seepage gas test is finished, and the PEEK insulating joint of the resistivity measuring instrument is installed, so that the resistivity measurement can be carried out. The resistivity tester can select a product brand 'Tonghui', a model number TH2810D, 4 PEEK insulating joints are matched, wherein 2 PEEK insulating joints are spare, and the testing capability under a high-voltage state is met.

The side wall of the round steel cylinder 1 is provided with a circumferential pressure sensor mounting hole c; an axial pressure sensor mounting hole d is formed in the side wall of the right second pressing sleeve 8, and the axial pressure sensor mounting hole d and the axial high-pressure liquid interface b are located on the left side and the right side of the annular protrusion 6a respectively. The middle part of the outer side wall of the round steel cylinder 1 is partially cut flat to be used as an installation platform of an ultrasonic generator 20, and the inlet of the left end of the pressure chamber is connected with a vibrator 19.

Preferably, the high pressure gas and liquid permeate lines connected to the pressure chamber are flexible tubes, and the pressure chamber is placed in a warm water bath to provide a suitable ambient temperature.

In addition, the left end of the pressure chamber is connected with a pressure sensor 14, a high-pressure valve 15 and a carbon dioxide gas source 16 in sequence through pipelines, and the right end of the pressure chamber is connected with the pressure sensor 14, the high-pressure valve 15, a drying agent 17 and a gas flowmeter 18 in sequence through pipelines. The device is used for carrying out the effect test of carbon dioxide displacement methane under different gas pressures. A support leg 13 is arranged below the round steel cylinder 1. The seepage test can adopt four gases of methane, nitrogen, carbon dioxide or hydrogen sulfide.

Claims (4)

1. The utility model provides a coal petrography appearance pressure chamber for gas seepage flow test, includes round steel cylinder (1), its characterized in that: the coal mine coal rock sample testing device is characterized by further comprising a hoop pressure transmission sleeve (2), T-shaped seal heads (3), a PEEK sleeve (4), a conical steel sleeve (5), a right piston sleeve (6), a right first pressing sleeve (7), a right second pressing sleeve (8), a left first pressing sleeve (9) and a left second pressing sleeve (10), wherein the hoop pressure transmission sleeve (2) is arranged in the circular steel cylinder (1), the outer diameter of the hoop pressure transmission sleeve (2) is smaller than the inner diameter of the circular steel cylinder (1), the two T-shaped seal heads (3) are oppositely arranged in the hoop pressure transmission sleeve (2) at left and right intervals, the rod part of each T-shaped seal head (3) is sleeved with one PEEK sleeve (4), the diameters of the left end part and the right end part of the hoop pressure transmission sleeve (2) are increased and are combined with a sealing check ring (12) to be tightly sealed, so that a cylindrical coal rock sample cavity (A) is formed between the hoop pressure transmission sleeve (2) and the two T-shaped seal heads (, an annular pressure applying cavity (B) is formed between the annular pressure transmitting sleeve (2) and the round steel cylinder (1); the left first pressing sleeve (9) is screwed at the left end of the round steel cylinder (1) and abuts against the left conical steel sleeve (5), and the front end of the left second pressing sleeve (10) is screwed in the left first pressing sleeve (9) and abuts against the left PEEK sleeve (4) through a circumferential cushion block (11); the right first pressing sleeve (7) is in threaded connection with the right end of the round steel cylinder (1) and abuts against the conical steel sleeve (5) on the right side, the right second pressing sleeve (8) is fixedly arranged behind the right first pressing sleeve (7), the right piston sleeve (6) penetrates through the right second pressing sleeve (8) and the right first pressing sleeve (7) and abuts against the PEEK sleeve (4) on the right side, the middle part of the right piston sleeve (6) is provided with a circumferential protrusion (6a) and can slide left and right in the large inner diameter section of the right second pressing sleeve (8), and the interface of the large inner diameter section of the right second pressing sleeve (8) serves as a right movement stopping limiting surface of the right piston sleeve (6);
two annular high-pressure liquid interfaces (a) are arranged on the side wall of the round steel cylinder (1), two axial high-pressure liquid interfaces (b) are arranged on the side wall of the right second pressing sleeve (8), and two seepage high-pressure gas and a PEEK insulating joint common interface of a resistivity tester are respectively arranged on the two T-shaped sealing heads (3);
a circumferential pressure sensor mounting hole (c) is formed in the side wall of the round steel cylinder (1), an axial pressure sensor mounting hole (d) is formed in the side wall of the right second pressing sleeve (8), and the axial pressure sensor mounting hole (d) and the axial high-pressure liquid interface (b) are respectively located on the left side and the right side of the circumferential protrusion (6 a); the middle part of the outer side wall of the round steel cylinder (1) is partially flattened to be used as an installation platform of an ultrasonic generator (20), and a vibrator (19) is connected to the inlet of the left end of the pressure chamber.
2. The pressure chamber for coal rock sample gas seepage test according to claim 1, characterized in that: the seepage high-pressure gas pipe and the high-pressure liquid pipe which are connected with the pressure chamber are both hoses, and the pressure chamber is arranged in a warm water bath.
3. The pressure chamber for coal rock sample gas seepage test according to claim 1, characterized in that: the left end of the pressure chamber is sequentially connected with a pressure sensor (14), a high-pressure valve (15) and a carbon dioxide gas source (16) through pipelines, and the right end of the pressure chamber is sequentially connected with the pressure sensor (14), the high-pressure valve (15), a drying agent (17) and a gas flowmeter (18) through pipelines.
4. The pressure chamber for coal rock sample gas seepage test according to claim 1, characterized in that: and support legs (13) are arranged below the round steel cylinder (1).
CN201910824244.4A 2019-09-02 2019-09-02 Pressure chamber for coal rock sample gas seepage test CN110530771B (en)

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CN201910824244.4A CN110530771B (en) 2019-09-02 2019-09-02 Pressure chamber for coal rock sample gas seepage test

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CN201910824244.4A CN110530771B (en) 2019-09-02 2019-09-02 Pressure chamber for coal rock sample gas seepage test

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110927045B (en) * 2019-12-25 2020-09-25 重庆大学 Long coal petrography sample gas-liquid seepage pressure chamber
CN110987764A (en) * 2019-12-25 2020-04-10 重庆大学 Long coal rock sample gas-liquid seepage test system
CN111007100B (en) * 2019-12-25 2020-11-13 重庆大学 Long coal rock sample solid-gas coupling adsorption expansion test system

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CN101446542B (en) * 2008-12-15 2011-03-02 南通市飞宇石油科技开发有限公司 Triaxial core holder
US9051800B2 (en) * 2012-04-24 2015-06-09 Halliburton Energy Services, Inc. Multi-fluid injector core holder
CN104048982B (en) * 2014-06-30 2016-09-07 中国科学院武汉岩土力学研究所 A kind of Multifunctional core clamp holder of rock core Scaling Kernel magnetic resonance experiments
CN105606517B (en) * 2016-03-25 2017-05-03 中国地质大学(北京) Instrument for measuring relative permeability of low permeability reservoir using nuclear magnetic resonance
CN206410979U (en) * 2017-01-25 2017-08-15 重庆地质矿产研究院 A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test
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