CN109001418B - Device and method for testing plugging removal capability of hydrous coal body - Google Patents
Device and method for testing plugging removal capability of hydrous coal body Download PDFInfo
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- CN109001418B CN109001418B CN201810403677.8A CN201810403677A CN109001418B CN 109001418 B CN109001418 B CN 109001418B CN 201810403677 A CN201810403677 A CN 201810403677A CN 109001418 B CN109001418 B CN 109001418B
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- 230000005484 gravity Effects 0.000 claims abstract description 7
- 230000007246 mechanism Effects 0.000 claims description 85
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- 238000009529 body temperature measurement Methods 0.000 claims description 21
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- 239000012780 transparent material Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
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- 239000007789 gas Substances 0.000 abstract description 113
- 238000006073 displacement reaction Methods 0.000 abstract description 9
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Abstract
The invention discloses a device and a method for testing the blockage removing capability of a hydrous coal body, wherein the testing device comprises a coal sample clamping part, a temperature acquisition control part, a steam condensation reflux part, a medium feeding part, a gas collection part and a water collection part; during testing, firstly injecting moisture into a coal body sample for water saturation, then testing the natural drainage under the action of gravity, finally measuring the gas injection drainage by injecting a gas medium, firstly calculating the difference value between the total water injection quantity and the natural drainage quantity, then calculating the ratio of the gas injection drainage quantity to the difference value, and taking the ratio as the discharge ratio index for evaluating the plugging removal capability of the coal bed. The method can evaluate the gas injection blockage removing capability of coal bodies of different coal beds, and can test and calculate the emission ratio indexes of different displacement pressure gases aiming at the same coal core sample, so that the influence rule of the different displacement pressure gases on the gas injection blockage removing capability is obtained, and basic data support and theoretical guidance are provided for the high-pressure gas displacement coal bed moisture operation of a coal mine site.
Description
Technical Field
The invention relates to a testing device and a testing method, in particular to a plugging removal capability testing device and a testing method for a coal sample of a coal mine underground water-containing coal body, and belongs to the technical field of coal body testing.
Background
Mine disasters such as gas explosion, coal and gas outburst and the like in the coal mining process are main disasters which are easy to happen to a mine. The gas contained in high-rank coal and low-rank coal in China accounts for more than 2/3 in the total resource amount, and a high gas mine and a coal and gas outburst mine in coal mines in China account for about 15%. In order to ensure the safety of coal mining, special equipment is usually adopted to pump out or discharge gas (coal bed gas) in a coal bed, a rock stratum and a goaf, so that the gas can be effectively pumped out and discharged by improving the air permeability of the coal bed. However, the coal mine gas (coal bed gas) in China has special occurrence, has the characteristics of microporosity, low permeability and high adsorption, and the coal bed permeability of China is only 1.1974 multiplied by 10 on average-18～1.1596×10-14m2. Wherein the permeability is less than 0.1987 × 10-16m2Account for 35%, 0.1987X 10-16～0.1987×10-15m237% of the total weight of the powder is greater than 0.1987 x 10-15m2Is only 28%. Coal bed gas ground development and selection usually requires coal bed permeabilityThe transmittance is not less than 0.1987 × 10-15m2And the permeability of the high gas outburst coal seam in China is usually less than 0.1987 multiplied by 10-15m2。
In order to improve the air permeability of the coal seam, various pressure relief and permeability increasing technologies such as high-pressure water jet slotting, deep hole loosening blasting, high-pressure hydraulic fracturing and the like appear in the prior art. The high-pressure hydraulic fracturing technology has large effective influence radius, can greatly reduce the engineering quantity of construction drilling and generate good economic and social benefits, so the high-pressure hydraulic fracturing technology is widely applied to coal mines in China. However, due to the tension action of water, after water is injected into a coal bed coal body, part of water remains in the coal bed cracks and is difficult to discharge by adopting a high-pressure hydraulic fracturing technology, so that the coal body pores and cracks are blocked, and a mature method for solving the problem is not provided at present. In the domestic part of mines, high-pressure gas is adopted for displacement after water injection to discharge part of residual water for unblocking, and the high-pressure gas can be air, nitrogen or carbon dioxide and the like. However, the coal bed conditions in China are very different, the water discharging capacities of different coal bed coal bodies under the action of high-pressure gas are different, and the water discharging capacities of different coal bed coal bodies under the action of different high-pressure gas media on the same coal bed coal body are also different. At present, no relevant literature records and relevant data records exist for testing the coal seam gas injection plugging removal capability.
Disclosure of Invention
Aiming at the problems, the invention provides a device and a method for testing the plugging removal capability of a water-containing coal body, which can test the moisture discharge capability of the water-containing coal body under the action of high-pressure displacement gas, and further provide basic data support and theoretical guidance for the water displacement operation of a coal seam by the high-pressure gas on a coal mine site.
In order to achieve the purpose, the device for testing the blockage removing capability of the hydrous coal comprises a coal sample clamping part, a temperature acquisition control part, a steam condensation reflux part, a medium feeding part, a gas collection part and a water collection part;
the coal sample clamping part comprises a coal sample clamping mechanism, the coal sample clamping mechanism is of a box-shaped structure with a closed accommodating cavity, a medium injection pipe is arranged at the top of the box-shaped structure, one end of the medium injection pipe is communicated with the top of the closed accommodating cavity of the coal sample clamping mechanism, a water outlet pipe is arranged at the bottom of the box-shaped structure, and one end of the water outlet pipe is communicated with the bottom of the closed accommodating cavity of the coal sample clamping mechanism;
the temperature acquisition control part comprises an electric heating heat-preservation liner, a temperature measurement sensor and a heating temperature control mechanism; the electric heating heat-preservation liner is arranged inside the coal sample clamping mechanism with the box-type structure and surrounds the closed accommodating cavity of the coal sample clamping mechanism; the temperature measuring end of the temperature measuring sensor penetrates through the coal sample clamping mechanism of the box type structure and extends into the closed accommodating cavity; the heating temperature control mechanism comprises a controller, a heating control loop and a temperature feedback loop, wherein the controller is respectively electrically connected with the electric heating heat-preservation liner and the temperature measuring sensor;
the water collecting part comprises a water collecting tank;
the steam condensation reflux part comprises a reflux three-way stop valve, a reflux pipe and a steam condenser pipe; a first port of the backflow three-way stop valve is connected with the other end of the medium injection pipe, a second port of the backflow three-way stop valve is connected with one end of a backflow pipe, the other end of the backflow pipe is connected with a steam input end of a steam condenser pipe, and a condensing end of the steam condenser pipe is connected with a water collecting tank through a pipeline;
the medium supply part comprises a pressure indicator, a medium injection three-way stop valve, a water flux tester, a water supply mechanism, a pressure reducing valve and an air injection pressure gas cylinder; the first port of the medium injection three-way stop valve is connected with the third port of the backflow three-way stop valve through a pressure indicator and a pipeline, the second port of the medium injection three-way stop valve is connected with a water supply mechanism through a water flux tester and a pipeline, and the third port of the medium injection three-way stop valve is connected with an air injection pressure cylinder through a pressure reducing valve and a pipeline;
the gas collection part comprises a discharge valve, a gas-water separator, a drainage valve, a water volume flow recorder, a gas collection condenser pipe, a gas collection valve and a gas collection bottle; one end of the discharge valve is connected with the other end of the water outlet pipe, the other end of the discharge valve is connected with the input end of the gas-water separator, the water path output end of the gas-water separator is connected with the water collecting tank through the water discharge valve and the water volume flow recorder in sequence, the gas path output end of the gas-water separator is connected with the gas path input end of the gas collection condensation pipe in a communicating mode, the condensation output end of the gas collection condensation pipe is connected with the water discharge valve and the water volume flow recorder in a communicating mode through a pipeline, and the gas path output end of the gas collection condensation pipe is connected with the gas collection bottle through the.
As a further improvement scheme of the invention, the backflow three-way stop valve and the medium injection three-way stop valve are electromagnetic control three-way stop valves, the drain valve, the gas collecting valve and the pressure reducing valve are electromagnetic control valves, the water supply mechanism is provided with an electric control valve, the gas injection pressure gas cylinder is provided with an electric control valve, and the water flux tester, the pressure indicator and the water volume flow recorder are provided with data output ports; the water-containing coal blockage removing capability testing device further comprises an electric control part, wherein the electric control part comprises an industrial control computer, a coal sample heating control loop, a water injection control loop, a gas injection control loop and a data calculation output loop, and the industrial control computer is electrically connected with a heating temperature control mechanism, a backflow three-way stop valve, a medium injection three-way stop valve, an electric control valve of a water supply mechanism, an electric control valve of a gas injection pressure gas cylinder, a pressure indicator, a drain valve, a gas collecting valve, a water flux tester, a pressure reducing valve and a water volume flow recorder respectively.
As a further improvement of the invention, the coal sample clamping mechanism comprises a coal sample sleeve, an upper sealing and separating part, an upper sealing cover, a lower sealing and separating part and a lower sealing cover; the upper end and the lower end of the inner surface of the coal sample sleeve are provided with mounting internal threads, and the electric heating heat-preservation liner is arranged outside the coal sample sleeve in a surrounding manner; the upper sealing and separating part and the lower sealing and separating part are of stepped shaft structures which are symmetrically arranged up and down, each stepped shaft structure comprises a large-diameter section and a small-diameter section, the outer diameter size of the large-diameter section is matched with the inner diameter size of the coal sample sleeve, the large-diameter sections of the upper sealing and separating part and the lower sealing and separating part are oppositely arranged up and down, and the large-diameter sections of the upper sealing and separating part and the lower sealing and separating part are respectively connected with the coal sample sleeve in a sealing mode through sealing gaskets; the upper sealing spacer is provided with a medium injection channel and a temperature measurement channel which penetrate through the upper sealing spacer along the axial direction, the top end of the medium injection channel is communicated and connected with the medium injection pipe, and the top end of the temperature measurement channel is fixedly connected with the temperature measurement sensor; the lower sealing and spacing part is provided with a water outlet channel which penetrates through the lower sealing and spacing part along the axial direction, and the bottom end of the water outlet channel is communicated and connected with a water outlet pipe; go up sealed lid and sealed lid down and be the external screw thread cover structure of longitudinal symmetry, the internal diameter size of external screw thread cover structure cooperates with the external diameter size of the path section of step axle structure, external screw thread and the telescopic installation internal thread size of coal sample cooperate, external screw thread cover structure cup joints and installs on the path section of step axle structure, and external screw thread cover structure passes through screw-thread fit and installs on the coal sample sleeve.
As a further improvement scheme of the invention, a medium injection sealing element is arranged at the connecting position of the top end of the medium injection channel and the medium injection pipe, a temperature measurement sealing element is arranged at the connecting position of the top end of the temperature measurement channel and the temperature measurement sensor, and a water outlet pipe sealing element is arranged at the connecting position of the bottom end of the water outlet channel and the water outlet pipe.
As a further improvement of the invention, the end faces of the large-diameter sections of the stepped shaft structures of the upper packing member and the lower packing member are provided with groove structures which are sunken towards the direction of the small-diameter sections.
As a further improvement of the invention, the groove structure on the end face of the large-diameter section of the stepped shaft structure of the lower sealing part is set to be a conical groove structure with a small lower part and a large upper part. The conical groove structure has a drainage function and is convenient for water flow collection.
In one embodiment of the condenser tube of the present invention, the steam condenser tube and the gas collecting condenser tube are straight condenser tubes.
As a further improvement of the invention, the coal sample sleeve, the upper sealing and separating member and the lower sealing and separating member are all made of high-temperature-resistant transparent materials, and the coal sample clamping mechanism is provided with an observation window corresponding to the upper sealing and separating member and the lower sealing and separating member.
A testing method of a plugging removal capability testing device for hydrous coal bodies comprises the following steps:
a. selecting a coal sample: taking a large coal sample from a coal seam to be tested, recording the temperature of a coal measure stratum, sealing, packaging and transporting to a laboratory;
b. manufacturing and installing a coal core sample: manufacturing a coal core sample according to the shape and the size of the closed accommodating cavity of the coal sample clamping mechanism, and installing the coal core sample into the closed accommodating cavity of the coal sample clamping mechanism and sealing;
c. drying the coal core sample: operating a backflow three-way stop valve to enable a medium injection pipe and a backflow pipe to be in a communicated state, then starting a heating temperature control mechanism, slowly heating a coal core sample to 100 ℃ through real-time feedback of a temperature measurement sensor, preserving heat until a steam condensation pipe does not separate out water, then closing the heating temperature control mechanism and the backflow three-way stop valve, stopping heating, and gradually cooling until the temperature is constant;
d. water injection treatment of the coal core sample: operating the backflow three-way stop valve to enable the medium injection pipe and a pipeline where the pressure indicator is located to be in a communicated state, operating the medium injection three-way stop valve to enable the pipeline where the pressure indicator is located and a pipeline where the water flux tester is located to be in a communicated state, starting the water supply mechanism to inject water into the coal sample clamping mechanism until the coal sample clamping mechanism is saturated, observing water injection pressure through the pressure indicator during water injection, reading the numerical value of the water flux tester and recording the total water injection amount, and then closing the backflow three-way stop valve and the medium injection three-way stop valve;
e. and (3) natural drainage treatment of the coal core sample: opening a drain valve, a drain valve and a gas collecting valve, discharging water in the coal core sample into a water collecting tank through a water volume flow recorder under the action of self gravity, recording the natural water discharge under the action of gravity until the water is not drained any more, and then closing the drain valve, the drain valve and the gas collecting valve;
f. gas injection treatment of the coal core sample: the heating temperature control mechanism is started again, the heating temperature is set as the coal-based stratum temperature of the coal bed to be tested where the coal core sample is located, and heat is preserved until the temperature is constant after heating; then opening a drain valve, a drain valve and a gas collection valve, operating a backflow three-way stop valve to enable a medium injection pipe and a pipeline where a pressure indicator is located to be in a communicated state, operating a medium injection three-way stop valve to enable the pipeline where the pressure indicator is located to be in a communicated state with a pipeline where a pressure reducing valve is located, setting the pressure of the pressure reducing valve to be the actual coal bed gas injection pressure of a coal bed where a coal core sample is located to be tested, then opening a gas injection pressure gas cylinder to inject gas into the coal sample clamping mechanism, observing the gas injection pressure through the pressure indicator during gas injection, observing a water volume flow recorder until a gas-water separator and a gas collection condenser pipe do not discharge water any more, and recording the gas injection;
g. and (3) processing and calculating output of the sampling data: and closing the heating temperature control mechanism, the medium injection three-way stop valve, the backflow three-way stop valve, the drain valve and the gas collection valve in sequence, calculating a difference value between the total water injection amount and the natural water discharge amount, then calculating a ratio of the gas injection water discharge amount to the difference value, and taking the ratio as a discharge ratio index for evaluating the plugging removal capability of the coal seam.
Compared with the prior art, the testing device and the testing method for the plugging removal capability of the hydrous coal mass can realize testing and calculate the discharge ratio index by replacing the coal core samples prepared according to different coal seam coal masses, so as to evaluate the gas injection plugging removal capability of the coal masses of different coal seams; by replacing the gas injection pressure gas cylinders with different pressure gases, the emission ratio indexes of different displacement pressure gases can be tested and calculated for the same coal core sample, so that the influence rule of different displacement pressure gases on the gas injection blockage removing capability of the same coal core sample is obtained, and basic data support and theoretical guidance are provided for the high-pressure gas displacement coal bed moisture operation of a coal mine site.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a coal sample holding mechanism according to the present invention.
In the figure: 1. a coal sample clamping mechanism 2, a heating temperature control mechanism 3, an electric heating heat preservation inner container 4, a coal core sample 5, a temperature measuring sensor 6, a backflow three-way stop valve 7, a medium injection pipe 8, a backflow pipe 9, a steam condenser pipe 10, a water collecting tank 11, a medium injection three-way stop valve 12, a water supply mechanism 13, a water flux tester 14, a pressure indicator 15, a discharge valve 16, a gas-water separator 17, the device comprises a drainage valve, 18, a water volume flow recorder, 19, a pressure reducing valve, 20, a gas injection pressure gas cylinder, 21, a gas collecting valve, 22, a gas collecting condenser pipe, 23, a gas collecting cylinder, 24, a coal sample sleeve, 25, an upper sealing cover, 26, a lower sealing cover, 27, an upper sealing part, 28, a lower sealing part, 29, a temperature measuring sealing part, 30, a medium injection sealing part, 31, a water outlet pipe sealing part, 32, a water outlet pipe, 33 and a sealing gasket.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the plugging removal capability test device for the hydrous coal comprises a coal sample clamping part, a temperature acquisition control part, a steam condensation reflux part, a medium feeding part, a gas collection part and a water collection part.
The coal sample clamping part comprises a coal sample clamping mechanism 1, the coal sample clamping mechanism 1 is of a box-shaped structure with a closed accommodating cavity, a medium injection pipe 7 is arranged at the top of the box-shaped structure, one end of the medium injection pipe 7 is in through connection with the top of the closed accommodating cavity of the coal sample clamping mechanism 1, a water outlet pipe 32 is arranged at the bottom of the box-shaped structure, and one end of the water outlet pipe 32 is in through connection with the bottom of the closed accommodating cavity of the coal sample clamping mechanism 1.
The temperature acquisition control part comprises an electric heating heat-preservation liner 3, a temperature measurement sensor 5 and a heating temperature control mechanism 2; the electric heating heat-preservation liner 3 is arranged inside the box-type coal sample clamping mechanism 1, and the electric heating heat-preservation liner 3 is arranged around the closed accommodating cavity of the coal sample clamping mechanism 1; the temperature measuring end of the temperature measuring sensor 5 penetrates through the coal sample clamping mechanism 1 with the box-type structure and extends into the closed accommodating cavity; the heating temperature control mechanism 2 comprises a controller, a heating control loop and a temperature feedback loop, wherein the controller is respectively and electrically connected with the electric heating heat-preservation liner 3 and the temperature measuring sensor 5.
The water collection portion includes a water collection sump 10.
The steam condensation reflux part comprises a reflux three-way stop valve 6, a reflux pipe 8 and a steam condenser pipe 9; the first port of backward flow three way stop valve 6 is connected with the other end of medium injection pipe 7, and the second port of backward flow three way stop valve 6 is connected with the one end of back flow 8, and the other end of back flow 8 is connected with the steam input of steam condenser pipe 9, and the condensation end of steam condenser pipe 9 passes through the pipeline and is connected with water catch bowl 10.
The medium supply part comprises a pressure indicator 14, a medium injection three-way stop valve 11, a water flux tester 13, a water supply mechanism 12, a pressure reducing valve 19 and an air injection pressure gas cylinder 20; the first port of the medium injection three-way stop valve 11 is connected with the third port of the backflow three-way stop valve 6 through a pressure indicator 14 and a pipeline, the second port of the medium injection three-way stop valve 11 is connected with the water supply mechanism 12 through a water flux tester 13 and a pipeline, and the third port of the medium injection three-way stop valve 11 is connected with the gas injection pressure gas cylinder 20 through a pressure reducing valve 19 and a pipeline.
The gas collection part comprises a discharge valve 15, a gas-water separator 16, a drain valve 17, a water volume flow recorder 18, a gas collection condenser pipe 22, a gas collection valve 21 and a gas collection bottle 23; one end of a discharge valve 15 is connected with the other end of the water outlet pipe 32, the other end of the discharge valve 15 is connected with the input end of the gas-water separator 16, the water path output end of the gas-water separator 16 is connected with the water collecting tank 10 through a water discharge valve 17 and a water volume flow recorder 18 in sequence, the gas path output end of the gas-water separator 16 is communicated and connected with the gas path input end of the gas collection condensation pipe 22, the condensation output end of the gas collection condensation pipe 22 is communicated and connected with the pipeline between the water discharge valve 17 and the water volume flow recorder 18 through a pipeline, and the gas path output end of the gas collection condensation pipe 22 is connected with the gas collection bottle 23 through a gas collection valve 21.
Taking the coal blockage removing capability of an underground coal seam of a certain coal mine as an example, when the coal sample is tested, the water-containing coal blockage removing capability testing device firstly takes a large coal sample in the coal seam to be tested, records the temperature of the coal measure stratum as 25 ℃, and then seals, packages and transports the coal sample to a laboratory;
then, manufacturing a coal core sample 4 according to the size of phi 5cm multiplied by 10cm of the cylindrical closed accommodating cavity of the coal sample clamping mechanism 1, and installing the coal core sample 4 into the closed accommodating cavity of the coal sample clamping mechanism 1 for sealing;
operating the backflow three-way stop valve 6 to enable the medium injection pipe 7 and the backflow pipe 8 to be in a communicated state, then starting the heating temperature control mechanism 2, slowly heating the coal core sample 4 to 100 ℃ through real-time feedback of the temperature measurement sensor 5, preserving heat until the steam condensation pipe 9 does not separate out water, then closing the heating temperature control mechanism 2 and the backflow three-way stop valve 6, stopping heating, and gradually cooling until the temperature is constant;
then operating the backflow three-way stop valve 6 to enable the medium injection pipe 7 and the pipeline where the pressure indicator 14 is located to be in a communicated state, operating the medium injection three-way stop valve 11 to enable the pipeline where the pressure indicator 14 is located and the pipeline where the water flux tester 13 is located to be in a communicated state, starting the water supply mechanism 12 to inject water into the coal sample clamping mechanism 1 until the coal sample clamping mechanism is saturated, observing the water injection pressure through the pressure indicator 14 during water injection, reading the value of the water flux tester 13 and recording the total water injection amount to be 20cm3Then, the return three-way stop valve 6 and the medium injection three-way stop valve 11 are closed;
then opening a drain valve 15, a drain valve 17 and a gas collecting valve 21, discharging the water in the coal core sample 4 into the water collecting tank 10 through a water volume flow recorder 18 under the action of self gravity until the water is not drained any more, and recording the natural drainage amount of 4cm under the action of gravity3Then closing the drain valve 15, the drain valve 17 and the gas collecting valve 21;
then, the heating temperature control mechanism 2 is started again, the heating temperature is set to be 25 ℃, and the temperature is kept constant after heating;
then, a drain valve 15, a drain valve 17 and a gas collection valve 21 are opened, a return three-way stop valve 6 is operated to enable a pipeline where a medium injection pipe 7 and a pressure indicator 14 are located to be in a communicated state, a medium injection three-way stop valve 11 is operated to enable a pipeline where the pressure indicator 14 is located to be in a communicated state with a pipeline where a pressure reducing valve 19 is located, a gas injection pressure gas cylinder 20 is opened to inject gas into the coal sample clamping mechanism 1 after the pressure of the pressure reducing valve 19 is set to be 10MPa of the actual coal bed gas injection pressure, the gas injection pressure is observed through the pressure indicator 14 during gas injection, a water volume flow recorder 18 is observed until a gas-water separator 16 and a gas collection condenser 22 do not discharge water any more, and the gas injection water discharge is recorded to be3；
Finally, the heating temperature control mechanism 2, the medium injection three-way stop valve 11, the backflow three-way stop valve 6, the drain valve 15, the drain valve 17 and the gas collecting valve 21 are closed in sequence, the difference value between the total water injection amount and the natural water discharge amount is calculated, then the ratio of the gas injection water discharge amount to the difference value is calculated, and the ratio is calculated according to the ratioThe rate is used as a discharge ratio index for evaluating the plugging removal capability of the coal seam, namely the discharge ratio is as follows: 10cm3/(20cm3-4cm3)＝0.625。
In order to realize the automatic operation of the test process, as a further improvement of the invention, the backflow three-way stop valve 6 and the medium injection three-way stop valve 11 are electromagnetic control three-way stop valves, the drain valve 15, the drain valve 17, the gas collecting valve 21 and the pressure reducing valve 19 are electromagnetic control valves, the water supply mechanism 12 is provided with an electric control valve, the gas injection pressure gas cylinder 20 is provided with an electric control valve, and the water flux tester 13, the pressure indicator 14 and the water volume flow recorder 18 are provided with data output ports; the water-containing coal blockage removing capability testing device further comprises an electric control part, wherein the electric control part comprises an industrial control computer, a coal sample heating control loop, a water injection control loop, a gas injection control loop and a data calculation output loop, the industrial control computer is respectively electrically connected with the heating temperature control mechanism 2, the backflow three-way stop valve 6, the medium injection three-way stop valve 11, an electric control valve of the water supply mechanism 12, an electric control valve of the gas injection pressure gas cylinder 20, a pressure indicator 14, a drain valve 15, a drain valve 17, a gas collection valve 21, a water flux tester 13, a pressure reducing valve 19 and a water volume flow recorder 18. The heating temperature control mechanism 2 and each valve can be automatically opened and closed under the control of an industrial control computer, and automatic data acquisition and calculation can be realized.
In order to facilitate the installation of the coal core sample 4 in the closed accommodating cavity of the coal sample clamping mechanism 1, as a further improvement of the present invention, as shown in fig. 2, the coal sample clamping mechanism 1 includes a coal sample sleeve 24, an upper sealing member 27, an upper sealing cover 25, a lower sealing member 28 and a lower sealing cover 26; the upper end and the lower end of the inner surface of the coal sample sleeve 24 are provided with mounting internal threads, and the electric heating heat-preservation liner 3 is arranged outside the coal sample sleeve 24 in a surrounding manner; the upper packing part 27 and the lower packing part 28 are stepped shaft structures which are symmetrically arranged up and down, each stepped shaft structure comprises a large-diameter section and a small-diameter section, the outer diameter size of the large-diameter section is matched with the inner diameter size of the coal sample sleeve 24, the large-diameter sections of the upper packing part 27 and the lower packing part 28 are arranged up and down oppositely, and the large-diameter sections of the upper packing part 27 and the lower packing part 28 are respectively connected with the coal sample sleeve 24 in a sealing mode through sealing gaskets 33; the upper sealing spacer 27 is provided with a medium injection channel and a temperature measuring channel which penetrate through the upper sealing spacer 27 along the axial direction, the top end of the medium injection channel is communicated and connected with the medium injection pipe 7, and the top end of the temperature measuring channel is fixedly connected with the temperature measuring sensor 5; the lower sealing and spacing part 28 is provided with a water outlet channel which penetrates through the lower sealing and spacing part 28 along the axial direction, and the bottom end of the water outlet channel is communicated and connected with a water outlet pipe 32; the upper sealing cover 25 and the lower sealing cover 26 are external thread sleeve structures which are symmetrical up and down, the internal diameter size of the external thread sleeve structures is matched with the external diameter size of the small diameter section of the stepped shaft structure, the external thread is matched with the installation internal thread size of the coal sample sleeve 24, the external thread sleeve structures are sleeved and installed on the small diameter section of the stepped shaft structure, and the external thread sleeve structures are installed on the coal sample sleeve 24 through thread matching. The insertion or extraction of the core sample 4 can be achieved by disassembling and assembling the upper or lower packing 27, 28.
In order to further ensure the sealing effect of the inner cavity of the coal sample clamping mechanism 1, as a further improvement scheme of the invention, a medium injection sealing element 30 is arranged at the connecting position of the top end of the medium injection channel and the medium injection pipe 7, a temperature measurement sealing element 29 is arranged at the connecting position of the top end of the temperature measurement channel and the temperature measurement sensor 5, and a water outlet pipe sealing element 31 is arranged at the connecting position of the bottom end of the water outlet channel and the water outlet pipe 32.
In order to realize uniform water injection or gas injection and uniform collection of moisture in the coal core sample 4, as a further improvement of the present invention, the end faces of the large diameter sections of the stepped shaft structures of the upper packing member 27 and the lower packing member 28 are provided with groove structures recessed toward the direction of the small diameter section.
In order to collect the moisture in the coal core sample 4, as a further modification of the present invention, the groove structure on the end surface of the large-diameter section of the stepped shaft structure of the lower partition 28 is configured as a tapered groove structure with a smaller lower part and a larger upper part. The conical groove structure has a drainage function and is convenient for water flow collection.
In one embodiment of the condenser pipe of the present invention, the steam condenser pipe 9 and the gas-collecting condenser pipe 22 are straight condenser pipes.
In order to facilitate the observation of the water injection, as a further improvement of the present invention, the coal sample sleeve 24, the upper sealing member 27 and the lower sealing member 28 are made of high temperature resistant transparent materials, and the coal sample clamping mechanism 1 is provided with an observation window corresponding to the upper sealing member 27 and the lower sealing member 28.
Claims (8)
1. A plugging removal capability test device for hydrous coal bodies is characterized by comprising a coal sample clamping part, a temperature acquisition control part, a steam condensation reflux part, a medium feeding part, a gas collection part and a water collection part;
the coal sample clamping part comprises a coal sample clamping mechanism (1), the coal sample clamping mechanism (1) is of a box-shaped structure with a closed accommodating cavity, a medium injection pipe (7) is arranged at the top of the box-shaped structure, one end of the medium injection pipe (7) is communicated with the top of the closed accommodating cavity of the coal sample clamping mechanism (1), a water outlet pipe (32) is arranged at the bottom of the box-shaped structure, and one end of the water outlet pipe (32) is communicated with the bottom of the closed accommodating cavity of the coal sample clamping mechanism (1);
the temperature acquisition control part comprises an electric heating heat-preservation liner (3), a temperature measurement sensor (5) and a heating temperature control mechanism (2); the electric heating and heat-insulating inner container (3) is arranged inside the coal sample clamping mechanism (1) with the box-type structure, and the electric heating and heat-insulating inner container (3) is arranged around the closed accommodating cavity of the coal sample clamping mechanism (1); the temperature measuring end of the temperature measuring sensor (5) penetrates through the coal sample clamping mechanism (1) with the box-type structure and extends into the closed accommodating cavity; the heating temperature control mechanism (2) comprises a controller, a heating control loop and a temperature feedback loop, wherein the controller is respectively and electrically connected with the electric heating heat-preservation liner (3) and the temperature measuring sensor (5);
the water collecting part comprises a water collecting groove (10);
the steam condensation reflux part comprises a reflux three-way stop valve (6), a reflux pipe (8) and a steam condensation pipe (9); a first port of the backflow three-way stop valve (6) is connected with the other end of the medium injection pipe (7), a second port of the backflow three-way stop valve (6) is connected with one end of a backflow pipe (8), the other end of the backflow pipe (8) is connected with a steam input end of a steam condensation pipe (9), and a condensation end of the steam condensation pipe (9) is connected with a water collection tank (10) through a pipeline;
the medium supply part comprises a pressure indicator (14), a medium injection three-way stop valve (11), a water flux tester (13), a water supply mechanism (12), a pressure reducing valve (19) and an air injection pressure gas cylinder (20); a first port of the medium injection three-way stop valve (11) is connected with a third port of the backflow three-way stop valve (6) through a pressure indicator (14) and a pipeline, a second port of the medium injection three-way stop valve (11) is connected with a water supply mechanism (12) through a water flux tester (13) and a pipeline, and a third port of the medium injection three-way stop valve (11) is connected with an air injection pressure gas cylinder (20) through a pressure reducing valve (19) and a pipeline;
the gas collection part comprises a discharge valve (15), a gas-water separator (16), a drain valve (17), a water volume flow recorder (18), a gas collection condenser pipe (22), a gas collection valve (21) and a gas collection bottle (23); one end of a drain valve (15) is connected with the other end of a water outlet pipe (32), the other end of the drain valve (15) is connected with the input end of a gas-water separator (16), the water path output end of the gas-water separator (16) is connected with a water collecting tank (10) through a drain valve (17) and a water volume flow recorder (18) in sequence, the gas path output end of the gas-water separator (16) is communicated and connected with the gas path input end of a gas collection condensing pipe (22), the condensation output end of the gas collection condensing pipe (22) is communicated and connected with a pipeline between the drain valve (17) and the water volume flow recorder (18) through a pipeline, and the gas path output end of the gas collection condensing pipe (22) is connected with a gas collection bottle (23) through a gas collection valve (21);
the backflow three-way stop valve (6) and the medium injection three-way stop valve (11) are electromagnetic control three-way stop valves, the drain valve (15), the drain valve (17), the gas collecting valve (21) and the pressure reducing valve (19) are electromagnetic control valves, the water supply mechanism (12) is provided with an electric control valve, the gas injection pressure gas cylinder (20) is provided with an electric control valve, and the water flux tester (13), the pressure indicator (14) and the water volume flow recorder (18) are provided with data output ports; the water-containing coal blockage removing capability testing device further comprises an electric control part, the electric control part comprises an industrial control computer, a coal sample heating control loop, a water injection control loop, a gas injection control loop and a data calculation output loop, the industrial control computer is respectively connected with a heating temperature control mechanism (2), a backflow three-way stop valve (6), a medium injection three-way stop valve (11), an electric control valve of a water supply mechanism (12), an electric control valve of a gas injection pressure gas cylinder (20), a pressure indicator (14), a discharge valve (15), a drain valve (17), a gas collection valve (21), a water flux tester (13), a pressure reducing valve (19) and a water volume flow recorder (18) in an electric connection mode.
2. The device for testing the blockage relieving capacity of the hydrous coal body according to claim 1, wherein the coal sample clamping mechanism (1) comprises a coal sample sleeve (24), an upper sealing part (27), an upper sealing cover (25), a lower sealing part (28) and a lower sealing cover (26); the upper end and the lower end of the inner surface of the coal sample sleeve (24) are respectively provided with an installation internal thread, and the electric heating heat-preservation liner (3) is arranged outside the coal sample sleeve (24) in a surrounding manner; the upper sealing and separating part (27) and the lower sealing and separating part (28) are of stepped shaft structures which are symmetrically arranged up and down, each stepped shaft structure comprises a large-diameter section and a small-diameter section, the outer diameter of the large-diameter section is matched with the inner diameter of the coal sample sleeve (24), the large-diameter sections of the upper sealing and separating part (27) and the lower sealing and separating part (28) are oppositely arranged up and down, and the large-diameter sections of the upper sealing and separating part (27) and the lower sealing and separating part (28) are respectively connected with the coal sample sleeve (24) in a sealing mode through sealing gaskets (33); the upper sealing spacer (27) is provided with a medium injection channel and a temperature measurement channel which penetrate through the upper sealing spacer (27) along the axial direction, the top end of the medium injection channel is communicated and connected with the medium injection pipe (7), and the top end of the temperature measurement channel is fixedly connected with the temperature measurement sensor (5); a water outlet channel which penetrates through the lower sealing part (28) along the axial direction is arranged on the lower sealing part (28), and the bottom end of the water outlet channel is communicated and connected with a water outlet pipe (32); go up sealed lid (25) and sealed lid (26) down and be the external screw thread cover structure of longitudinal symmetry, the internal diameter size of external screw thread cover structure cooperates with the external diameter size of the path section of step shaft structure, the external screw thread cooperates with the installation internal thread size of coal sample sleeve (24), external screw thread cover structure cup joints and installs on the path section of step shaft structure, and external screw thread cover structure passes through screw-thread fit and installs on coal sample sleeve (24).
3. The plugging removal capability test device for the hydrous coal body according to claim 2, wherein a medium injection sealing member (30) is arranged at a connecting position of the top end of the medium injection channel and the medium injection pipe (7), a temperature measurement sealing member (29) is arranged at a connecting position of the top end of the temperature measurement channel and the temperature measurement sensor (5), and a water outlet pipe sealing member (31) is arranged at a connecting position of the bottom end of the water outlet channel and the water outlet pipe (32).
4. The device for testing the blockage relieving capacity of the hydrous coal body as claimed in claim 2, wherein the end faces of the large-diameter sections of the stepped shaft structures of the upper sealing member (27) and the lower sealing member (28) are provided with groove structures which are sunken towards the direction of the small-diameter sections.
5. The plugging removal capability test device for the hydrous coal body as claimed in claim 4, wherein the groove structure on the end face of the large-diameter section of the stepped shaft structure of the lower sealing member (28) is set to be a conical groove structure with a smaller lower part and a larger upper part.
6. The device for testing the blockage relieving capacity of the hydrous coal body according to claim 2, wherein the coal sample sleeve (24), the upper sealing member (27) and the lower sealing member (28) are all made of high-temperature-resistant transparent materials, and the coal sample clamping mechanism (1) is provided with an observation window at the position corresponding to the upper sealing member (27) and the lower sealing member (28).
7. The plugging removal capability test device for the hydrous coal body as claimed in claim 1, wherein the steam condenser pipe (9) and the gas-collecting condenser pipe (22) are straight condenser pipes.
8. A testing method of a plugging removal capability testing device for hydrous coal bodies is characterized by comprising the following steps:
a. selecting a coal sample: taking a large coal sample from a coal seam to be tested, recording the temperature of a coal measure stratum, sealing, packaging and transporting to a laboratory;
b. manufacturing and installing a coal core sample: manufacturing a coal core sample (4) according to the shape and the size of the closed accommodating cavity of the coal sample clamping mechanism (1), and installing the coal core sample (4) into the closed accommodating cavity of the coal sample clamping mechanism (1) and sealing;
c. drying the coal core sample: operating a backflow three-way stop valve (6) to enable a medium injection pipe (7) and a backflow pipe (8) to be in a communicated state, then starting a heating temperature control mechanism (2), slowly heating a coal core sample (4) to 100 ℃ through real-time feedback of a temperature measurement sensor (5) and preserving heat until a steam condensation pipe (9) does not separate out moisture any more, then closing the heating temperature control mechanism (2) and the backflow three-way stop valve (6), stopping heating and gradually cooling until the temperature is constant;
d. water injection treatment of the coal core sample: operating the backflow three-way stop valve (6) to enable the medium injection pipe (7) and a pipeline where the pressure indicator (14) is located to be in a communicated state, operating the medium injection three-way stop valve (11) to enable the pipeline where the pressure indicator (14) is located and a pipeline where the water flux tester (13) is located to be in a communicated state, starting a water supply mechanism (12) to inject water into the coal sample clamping mechanism (1) until the coal sample clamping mechanism is saturated, observing water injection pressure through the pressure indicator (14) during water injection, reading the numerical value of the water flux tester (13) and recording the total water injection amount, and then closing the backflow three-way stop valve (6) and the medium injection three-way stop valve (11);
e. and (3) natural drainage treatment of the coal core sample: opening a drain valve (15), a drain valve (17) and a gas collecting valve (21), discharging water in the coal core sample (4) into a water collecting tank (10) through a water volume flow recorder (18) under the action of self gravity, recording the natural water discharge under the action of gravity until the water is not drained any more, and then closing the drain valve (15), the drain valve (17) and the gas collecting valve (21);
f. gas injection treatment of the coal core sample: the heating temperature control mechanism (2) is restarted, the heating temperature is set to be the coal-series stratum temperature of the coal bed to be tested where the coal core sample (4) is located, and heat is preserved until the temperature is constant after heating; then opening a drain valve (15), a drain valve (17) and a gas collection valve (21), operating a backflow three-way stop valve (6) to enable a medium injection pipe (7) and a pipeline where a pressure indicator (14) is located to be in a communicated state, operating a medium injection three-way stop valve (11) to enable the pipeline where the pressure indicator (14) is located to be in a communicated state with the pipeline where a pressure reducing valve (19) is located, setting the pressure of the pressure reducing valve (19) to be the actual coal bed gas injection pressure of a coal bed to be tested where a coal core sample (4) is located, then opening a gas injection pressure gas cylinder (20) to inject gas into the coal sample clamping mechanism (1), observing the gas injection pressure through the pressure indicator (14) during gas injection, observing a water volume flow recorder (18) until a gas-water separator (16) and a gas collection condenser (22) do not discharge water any more, and recording the gas injection and drainage quantity;
g. and (3) processing and calculating output of the sampling data: and closing the heating temperature control mechanism (2), the medium injection three-way stop valve (11), the backflow three-way stop valve (6), the drain valve (15), the drain valve (17) and the gas collection valve (21) in sequence, calculating the difference value between the total water injection amount and the natural water discharge amount, then calculating the ratio between the gas injection water discharge amount and the difference value, and taking the ratio as the discharge ratio index for evaluating the plugging removal capability of the coal seam.
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| CN112710450B (en) * | 2020-12-16 | 2021-12-28 | 中国矿业大学 | Hydraulic pulse blockage removal experiment system and method for fracture blockage caused by particles |
| CN115308103B (en) * | 2022-06-27 | 2024-05-17 | 中国矿业大学 | System and method for testing flow characteristics of multiphase medium in coal or rock mass fracture |
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