CN102288529B - Device for simultaneously measuring expansion and permeability rate of gas injected into coal rock under tri-axial stress condition - Google Patents

Device for simultaneously measuring expansion and permeability rate of gas injected into coal rock under tri-axial stress condition Download PDF

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Publication number
CN102288529B
CN102288529B CN 201110264306 CN201110264306A CN102288529B CN 102288529 B CN102288529 B CN 102288529B CN 201110264306 CN201110264306 CN 201110264306 CN 201110264306 A CN201110264306 A CN 201110264306A CN 102288529 B CN102288529 B CN 102288529B
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pressure
gas
permeability
sample cylinder
water tank
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CN 201110264306
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Chinese (zh)
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CN102288529A (en
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王延斌
倪小明
王向浩
王晋
刘成龙
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中国矿业大学(北京)
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Abstract

The invention discloses a device for simultaneously measuring expansion and permeability rate of gas injected into a coal rock under a tri-axial stress condition. The device comprises a gas injection system (1), a confining pressure system (2), an axial pressure loading machine (25), a permeability measuring system (3) and a data acquisition system (4), wherein the gas outlet port of the gas injection system (1) is connected with the gas inlet port of the confining pressure system (2) through a high pressure gas inlet pipe (43); the axial pressure loading machine (25) is arranged at the external part of the confining pressure system (2); the permeability measuring system (3) is connected with the gas outlet port of the confining pressure system (2) through a high pressure gas pipe; and the data acquisition system (4) is connected with the confining pressure system (2) through a data line with a sensor. According to the device provided by the invention, the problem of measuring coal-body deformations and permeability variations of different adsorption gases at different temperatures and different pressures is effectively solved; in addition, the permeability and coal-body change laws caused by a gas injection displacement in the process of developing coal bed gases are effectively simulated so that the production practice is beneficial to be further guided.

Description

The gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress

Technical field

The invention belongs to the air pressure technical field of measurement and test, be specifically related to the expansion of gas inject coal petrography and permeability while determinator under a kind of condition of triaxial stress.

Background technology

Coal-seam gas is a kind of novel cleaning, clean energy resource.Based on mine safety and energy utilization angle, coal in China department, oil sector, Geological And Mineral Resources Departments In Their, local government, domestic and international priority such as coal-seam gas company nearly 5000 mouthfuls of coal bed gas wells (ending for the end of the year 2010) of having constructed in Chinese 42 coal provinces.But except having realized the local commercial development that most of regional cbm development test findings are unsatisfactory in the minority areas such as the Qinshui Basin In Shanxi Province southeast, Liaoning iron processes, Shanxi Hedong Coalfield.

Can coal-seam gas realize two aspects that how much depend primarily on of output and quantum of output, the one, and have and do not have enough coal bed gas resources; Then be to have not have enough unimpeded passage and energy system to make coal-seam gas be able to change free state and output into from adsorbed state on the other hand, Neither of the two can be dispensed.In order to make coal-seam gas output from coal seam reservoirs, people can make coal-seam gas change the free state output into from ADSORPTION STATE by the pressure system that draining changes coal seam reservoirs, also can gas injection in the coal seam, make gas and the methane gas generation competitive Adsorption of injection, make methane gas from coal seam reservoirs, be transformed into the free state output from ADSORPTION STATE.No matter be the output of which kind of mode, when methane gas after the desorb output, can cause the contraction of matrix of coal from matrix of coal, and then cause the change of coal seam reservoirs permeability.The large quantity research that forefathers do general only is studied the variation of physical parameter before the coal-bed gas exploitation, and gas absorption, desorb are caused coal petrography, swelling and the permeability that causes can not be expressed by quantitative.And along with the carrying out of coal-bed gas exploitation, the Adsorption and desorption of gas causes that the change of coal seam reservoirs permeability is more and more important on the production capacity impact.Therefore, need a kind of device of development badly, can under the different confined pressure conditions, under the different temperatures, cause behind the gas inject that the swell increment of coal petrography and Permeability Oe Coal And Porous Rock And Fractured Rock measure simultaneously, in order to find out the variation that causes coal petrography swell increment and permeability after different temperatures, pressure, gas with various inject, in the hope of providing theoretical foundation for cbm development technique, the formulation of coal bed gas extraction working system.

Summary of the invention

The present invention is in order to solve weak point of the prior art, the expansion of gas inject coal petrography and permeability while determinator under a kind of condition of triaxial stress are provided, this device can be to coal petrography swell increment, amount of contraction and permeability quantitative expression during the gentle body desorb of gas injection under different temperatures, the pressure, for the cbm development process choice, row adopts working system that theoretical direction is provided.

For solving the problems of the technologies described above, the present invention adopts following technical scheme: the gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress, comprise gas injection system 1, confined pressure system 2, axle pressure adds carrier aircraft 25, testing permeability system 3 and data acquisition system (DAS) 4, the gas outlet of gas injection system 1 is connected with the air intake opening of confined pressure system 2 by high-pressure pipe 43, axle pressure adds carrier aircraft 25 and is located at confined pressure system 2 outsides, testing permeability system 3 is connected by the gas outlet of high-pressure air pipe with confined pressure system 2, and data acquisition system (DAS) 4 is connected with confined pressure system 2 by the data line with sensor.

Described confined pressure system 2 comprises tank 28, high-pressure hydraulic pump 29, bearing 27, sample cylinder 32, constant temperature water tank 26 and cover plate 16, the pump mouth of high-pressure hydraulic pump 29 is connected with tank 28 by drinking-water pipe 40, the water delivering orifice of high-pressure hydraulic pump 29 is by being connected with constant temperature water tank 26 by rising pipe 42, be provided with the first rubber blanket 10 between constant temperature water tank 26 and the cover plate 16 and removably connect by fastening bolt 9, bearing 27 is located at axle pressure and adds in the middle of the carrier aircraft 25, constant temperature water tank 26 is located on the bearing 27, be provided with well heater 13 in the constant temperature water tank 26, sample cylinder 32 is located in the constant temperature water tank 26, and sample cylinder 32 tops are provided with the sieve plate 17 of porous.

Described gas injection system 1 comprises gas cylinder 7, high-pressure pump 8, first flow meter 11 and the first tensimeter 12, gas cylinder 7 is connected with high-pressure pump 8 by high-voltage tube 5, high-voltage tube 5 is provided with the first valve 6, first flow meter 11 and the first tensimeter 12 are located on the high-pressure pipe 43, high-pressure pipe 43 is connected with the air intake opening at sample cylinder 32 tops by pipe adapter 15, and high-pressure pipe 43 is provided with the second valve 41.

Described testing permeability system 3 comprises air bag 24, vacuum pump 30, the second flowmeter 45, the second tensimeter 46, the 3rd valve 50 and the 4th valve 51, vacuum pump 30 is connected with the gas outlet of sample cylinder 32 bottoms by exhaust tube 47, vacuum pump 30 is connected with air bag 24 by gas outlet 48, air bag 24 is connected with the gas outlet of sample cylinder 32 bottoms by testing tube 49, the second flowmeter 45, the second tensimeter 46 and the 3rd valve 50 all are located on the testing tube 49, and the 4th valve 51 is located on the exhaust tube 47.

Described data acquisition system (DAS) 4 comprises computing machine 20, axial strain sensor 14, radial strain sensor 18, temperature sensor 22 and pressure transducer 23, axial strain sensor 14 is located at sample cylinder 32 tops, radial strain sensor 18, temperature sensor 22 and pressure transducer 23 all are located at sample cylinder 32 outside portions, the constant temperature water tank 31 outer backing plates 21 that are provided with, the cable 19 of computing machine 20 by penetrating constant temperature water tank 31 and backing plate 21 respectively with axial strain sensor 14, radial strain sensor 18, temperature sensor 22 is connected connection with pressure transducer, cable 19 penetrates backing plate 21 places and expands by the polyurethane condensation and seal.

Described sample cylinder 32 is docked by six block plates and forms, and leaves the space between each steel plate, is provided with the second rubber blanket 52 in this space.

Described sample cylinder 32 is provided with blowdown valve 33.

Adopting technique scheme, gas injection system mainly is the gas of required various proportionings to be provided and to carry out airtight test for experiment; The confined pressure system mainly provides the needed confined pressure of coal sample, provides isoperibol for experiment simultaneously; If axle pressure loads the owner and provides needed lateral pressure for the confined pressure system; The testing permeability system measures the perviousness of coal body; Data acquisition system (DAS) mainly is to carry out data acquisition and processing.

In the confined pressure system coal sample is contained in the sample cylinder, well heater guarantees that the water temperature in the constant temperature water tank keeps the steady temperature of test, and the first rubber blanket plays good sealing function, stops up after the tracheae that sieve plate can be avoided linking to each other with the sample cylinder top contacts coal sample.

The gas cylinder of gas injection system is provided with a plurality of, and each gas cylinder is equipped with respectively the gas of different proportionings, and concrete proportioning is carried out pre-configured according to experiment purpose.For carbon dioxide and Adsorption of methane displacement test, gas cylinder can fill respectively helium, 20% methane+80% carbon dioxide, 40% methane+60% carbon dioxide, 60% methane+40% carbon dioxide, 80% methane+20% carbon dioxide.Certainly, for different experiment purposes, also can carry out the configuration of other gases, such as: 20% methane+20% carbon dioxide+60% nitrogen.Can inject respectively the gas of heterogeneity in the experimentation, the distortion of coal body and perviousness changed when the coal seam was replaced adsorbed gas, measured and observed.By the unlatching of each valve of control, control the gas that injects which gas cylinder during experiment.

The testing permeability system decides the gaseous tension of sample cylinder gas outlet and the perviousness that flow rate calculation goes out coal body by the second tensimeter and the second flow measurement.In order to ensure when experiment, be filled with gas in the coal sample and be gas in the gas cylinder, do not have contaminated.Then all will be by vacuum pump with the sample cylinder vacuum pumping before each test.For avoiding environmental pollution, by air bag the waste gas after testing is reclaimed simultaneously.

Data acquisition system (DAS) is crossed cable to the information exchange that collects and is sent to computing machine by being installed in various sensors on the sample cylinder, then processes and explains.Only cable and computing machine need to be carried out exact connect ion just can meet the demands.

Do not affect the harmomegathus of coal sample in order to ensure sample cylinder, sample cylinder is that six block plates dock and form.Leave the space between each steel plate for coal body harmomegathus, rubber blanket is installed in the space.After coal sample was packed sample cylinder into, only need be tightened sample cylinder with steel wire and get final product around a circle.Various sensors by welded and installed on sample cylinder.

Can carry out release by the pressure-release valve on the sample cylinder during hypertonia around the sample cylinder.The size of pressure can by the pressure transducer perception on the sample cylinder, then pass to computing machine through cable.

The present invention efficiently solves the mensuration problem of different adsorbed gases coal deformation amount and perviousness variable quantity under different temperatures, different pressures.Effectively simulated in the cbm development process, perviousness and coal body Changing Pattern that the gas injection displacement causes are conducive to further instruct production practices.

Description of drawings

Fig. 1 is structural representation of the present invention;

Fig. 2 is the upward view of sample cylinder in the middle of Fig. 1.

Embodiment

As shown in Figure 1, the gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress of the present invention, comprise that gas injection system 1, confined pressure system 2, axle pressure add carrier aircraft 25, testing permeability system 3 and data acquisition system (DAS) 4, the gas outlet of gas injection system 1 is connected with the air intake opening of confined pressure system 2 by high-pressure pipe 43, axle pressure adds carrier aircraft 25 and is located at confined pressure system 2 outsides, testing permeability system 3 is connected by the gas outlet of high-pressure air pipe with confined pressure system 2, and data acquisition system (DAS) 4 is connected with confined pressure system 2 by the data line with sensor.

Confined pressure system 2 comprises tank 28, high-pressure hydraulic pump 29, bearing 27, sample cylinder 32, constant temperature water tank 26 and cover plate 16, the pump mouth of high-pressure hydraulic pump 29 is connected with tank 28 by drinking-water pipe 40, the water delivering orifice of high-pressure hydraulic pump 29 is by being connected with constant temperature water tank 26 by rising pipe 42, be provided with the first rubber blanket 10 between constant temperature water tank 26 and the cover plate 16 and removably connect by fastening bolt 9, bearing 27 is located at axle pressure and adds in the middle of the carrier aircraft 25, constant temperature water tank 26 is located on the bearing 27, be provided with well heater 13 in the constant temperature water tank 26, sample cylinder 32 is located in the constant temperature water tank 26, and sample cylinder 32 tops are provided with the sieve plate 17 of porous.As shown in Figure 2, sample cylinder 32 is docked by six block plates and forms, and leaves the space between each steel plate, is provided with the second rubber blanket 52 in this space.Sample cylinder 32 is provided with blowdown valve 33.

Gas injection system 1 comprises gas cylinder 7, high-pressure pump 8, first flow meter 11 and the first tensimeter 12, gas cylinder 7 is connected with high-pressure pump 8 by high-voltage tube 5, high-voltage tube 5 is provided with the first valve 6, first flow meter 11 and the first tensimeter 12 are located on the high-pressure pipe 43, high-pressure pipe 43 is connected with the air intake opening at sample cylinder 32 tops by pipe adapter 15, and high-pressure pipe 43 is provided with the second valve 41.

Testing permeability system 3 comprises air bag 24, vacuum pump 30, the second flowmeter 45, the second tensimeter 46, the 3rd valve 50 and the 4th valve 51, vacuum pump 30 is connected with the gas outlet of sample cylinder 32 bottoms by exhaust tube 47, vacuum pump 30 is connected with air bag 24 by gas outlet 48, air bag 24 is connected with the gas outlet of sample cylinder 32 bottoms by testing tube 49, the second flowmeter 45, the second tensimeter 46 and the 3rd valve 50 all are located on the testing tube 49, and the 4th valve 51 is located on the exhaust tube 47.

Data acquisition system (DAS) 4 comprises computing machine 20, axial strain sensor 14, radial strain sensor 18, temperature sensor 22 and pressure transducer 23, axial strain sensor 14 is located at sample cylinder 32 tops, radial strain sensor 18, temperature sensor 22 and pressure transducer 23 all are located at sample cylinder 32 outside portions, the constant temperature water tank 31 outer backing plates 21 that are provided with, the cable 19 of computing machine 20 by penetrating constant temperature water tank 26 and backing plate 21 respectively with axial strain sensor 14, radial strain sensor 18, temperature sensor 22 is connected connection with pressure transducer, cable 19 penetrates backing plate 21 places and expands by the polyurethane condensation and seal.

Concrete experimental procedure is as follows:

1), whether the performance of each system of first checking experiment device is intact.Each gas cylinder 7 interior gas that different proportionings are housed respectively, concrete proportioning is carried out pre-configured according to experiment purpose.

2), ready coal sample 31 is carried out preheating, the hot water of standby enough capacities of while.

3), the good experimental provision of exact connect ion, and carry out airtight test.

4), with coal sample 31 sample cylinder 32 of packing into, build the cover plate 16 of constant temperature water tank 26, first-class fastening bolt 9.

5), starting high-pressure hydraulic pump 29 hot water that temperature is suitable injects in the airtight constant temperature water tank 26, pressurize by high-pressure hydraulic pump 29, make sample cylinder 32 pressure on every side reach required confined pressure, when hypertonia, can carry out release by the pressure-release valve 33 on the sample cylinder 32.The size of pressure can by pressure transducer 23 perception on the sample cylinder 32, then pass to computing machine 20 through cable 19.Realize by constant temperature water tank 26 at this for the required isoperibol of experiment, according to the experimental temperature requirement, make water in the constant temperature water tank 26 as far as possible near test temperature, but can not be higher than test temperature.After high-pressure hydraulic pump 29 injects constant temperature water tanks 26, by its temperature height of temperature sensor 22 perception, when it is lower than when temperature required, by well heater 13 it is heated.Until reach required pressure in the constant temperature water tank 26.

6), close the first valve 6 and the second valve 41, start vacuum pump 30, make sample cylinder 32 interior vacuum pumpings.

7), close the 3rd valve 50 and the 4th valve 51, open the first valve 6, start high-pressure pump 8, beginning is to the gas of the required injection of sample cylinder 32 interior injections.

8), operating axis 32 applies lateral pressure to pressure-loaded machine 25 to sample cylinder, treat to reach in the sample cylinder 32 stable after, the reading of record first flow meter 11, the first tensimeter 12, the second flowmeter 45 and the second tensimeter 46, and the information that computing machine 20 autostore axial strain sensor 14, radial strain sensor 18, temperature sensor 22 and pressure transducer 23 are collected.

9), repeating aforesaid operations tests various mixed gases.

10), process experimental data, arrangement experimental provision.

Claims (6)

1. the gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress, it is characterized in that: comprise gas injection system (1), confined pressure system (2), axle pressure adds carrier aircraft (25), testing permeability system (3) and data acquisition system (DAS) (4), the gas outlet of gas injection system (1) is connected with the air intake opening of confined pressure system (2) by high-pressure pipe (43), axle pressure adds carrier aircraft (25) and is located at confined pressure system (2) outside, testing permeability system (3) is connected by the gas outlet of high-pressure air pipe with confined pressure system (2), and data acquisition system (DAS) (4) is connected with confined pressure system (2) by the data line with sensor;
Described confined pressure system (2) comprises tank (28), high-pressure hydraulic pump (29), bearing (27), sample cylinder (32), constant temperature water tank (26) and cover plate (16), the pump mouth of high-pressure hydraulic pump (29) is connected with tank (28) by drinking-water pipe (40), the water delivering orifice of high-pressure hydraulic pump (29) is connected with constant temperature water tank (26) by rising pipe (42), being provided with the first rubber blanket (10) between constant temperature water tank (26) and the cover plate (16) also removably connects by fastening bolt (9), bearing (27) is located at axle pressure and adds in the middle of the carrier aircraft (25), constant temperature water tank (26) is located on the bearing (27), be provided with well heater (13) in the constant temperature water tank (26), sample cylinder (32) is located in the constant temperature water tank (26), and sample cylinder (32) top is provided with the sieve plate (17) of porous.
2. the gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress according to claim 1, it is characterized in that: described gas injection system (1) comprises gas cylinder (7), high-pressure pump (8), first flow meter (11) and the first tensimeter (12), gas cylinder (7) is connected with high-pressure pump (8) by high-voltage tube (5), high-voltage tube (5) is provided with the first valve (6), first flow meter (11) and the first tensimeter (12) are located on the high-pressure pipe (43), high-pressure pipe (43) is connected with the air intake opening at sample cylinder (32) top by pipe adapter (15), and high-pressure pipe (43) is provided with the second valve (41).
3. the gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress according to claim 2, it is characterized in that: described testing permeability system (3) comprises air bag (24), vacuum pump (30), the second flowmeter (45), the second tensimeter (46), the 3rd valve (50) and the 4th valve (51), vacuum pump (30) is connected by the gas outlet of exhaust tube (47) with sample cylinder (32) bottom, vacuum pump (30) is connected with air bag (24) by gas outlet (48), air bag (24) is connected by the gas outlet of testing tube (49) with sample cylinder (32) bottom, the second flowmeter (45), the second tensimeter (46) and the 3rd valve (50) all are located on the testing tube (49), and the 4th valve (51) is located on the exhaust tube (47).
4. the gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress according to claim 1, it is characterized in that: described data acquisition system (DAS) (4) comprises computing machine (20), axial strain sensor (14), radial strain sensor (18), temperature sensor (22) and pressure transducer (23), axial strain sensor (14) is located at sample cylinder (32) top, radial strain sensor (18), temperature sensor (22) and pressure transducer (23) all are located at sample cylinder (32) outside portion, the outer backing plate (21) that is provided with of constant temperature water tank (31), the cable (19) of computing machine (20) by penetrating constant temperature water tank (31) and backing plate (21) respectively with axial strain sensor (14), radial strain sensor (18), temperature sensor (22) is connected 23 with pressure transducer) connect, cable (19) penetrates backing plate (21) and locates to seal by polyurethane condensation expansion.
5. the gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress according to claim 1, it is characterized in that: described sample cylinder (32) is docked by six block plates and forms, leave the space between each steel plate, be provided with the second rubber blanket (52) in this space.
6. the gas inject coal petrography expands and permeability while determinator under the condition of triaxial stress according to claim 1, and it is characterized in that: described sample cylinder (32) is provided with blowdown valve (33).
CN 201110264306 2011-09-08 2011-09-08 Device for simultaneously measuring expansion and permeability rate of gas injected into coal rock under tri-axial stress condition CN102288529B (en)

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