CN210347634U - Coal seam gas pressure test system based on drilling sampling actual measurement - Google Patents
Coal seam gas pressure test system based on drilling sampling actual measurement Download PDFInfo
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- CN210347634U CN210347634U CN201920805015.3U CN201920805015U CN210347634U CN 210347634 U CN210347634 U CN 210347634U CN 201920805015 U CN201920805015 U CN 201920805015U CN 210347634 U CN210347634 U CN 210347634U
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Abstract
The utility model relates to a coal seam gas pressure test system based on drilling sampling actual measurement, which comprises a gas loss compensation device, a dead volume calibration device, a gas pressure measurement device, a dead volume filling device, a gas loss measurement device and a control system, wherein the gas pressure measurement device is respectively communicated with the gas loss compensation device, the dead volume calibration device, the dead volume filling device and the gas loss measurement device through a flow guide pipe; the control system is respectively and electrically connected with the gas loss compensation device, the dead volume calibration device, the gas pressure measuring device, the dead volume filling device and the gas loss measuring device, wherein at least one gas pressure measuring device is arranged, the gas pressure measuring device and the gas loss measuring device form a working group, and all the working groups are mutually connected in parallel. This novel can make and survey the in-process and can restore coal seam storage environment, the influence of eduction gear dead volume to gas pressure measuring result gets rid of and seals the hole effect poor in the underground survey, the influence of factors such as easy cluster hole, survey coal seam gas pressure that can be accurate.
Description
Technical Field
The utility model relates to a coal seam gas pressure test technique and equipment based on drilling sampling actual measurement belongs to coal mine safety technical field.
Background
Coal and gas outburst is closely related to coal seam gas pressure, and not only can the underground production facilities be seriously damaged by the coal and gas outburst, huge economic loss is caused to the country and enterprises, but also the gas concentration in underground air can be rapidly increased, gas explosion accidents are caused, and the personal safety of coal mine workers is seriously threatened. The requirements of the regulations on preventing and controlling coal and gas outburst are as follows: in the feasibility research stage of a newly-built mine, outburst risk assessment should be carried out on all coal seams with average thickness of more than 0.3m possibly exposed in mining engineering in the mine; coal mine enterprises and protruding mines with protruding mines need to make regional comprehensive outburst prevention measures and local comprehensive outburst prevention measures according to the actual conditions and conditions of the protruding mines. The gas pressure is an index for evaluating and predicting coal seam outburst risk and testing the effect of regional outburst elimination measures. The coal seam meeting one of the following conditions required by the regulations on coal and gas outburst prevention and control should be treated as an outburst coal seam, namely the gas content is more than or equal to 8m3/t or the gas pressure is more than or equal to 0.74 MPa. However, in an actual environment, the gas pressure of a coal seam to be tested is small, but the gas content is large, and the gas pressure test of the coal seam drilled in the well is influenced by the test site and the hole sealing quality, so that the test error is large, and the success rate is low. When the outburst prevention measure effect of the gas area of the pre-pumping coal seam is tested, the arranged pumping drill holes are easy to be connected with the pressure measuring holes in a hole string mode, so that the measured residual gas pressure value is smaller than an actual value, underground operators cannot accurately judge the coal seam pressure, and coal and gas outburst accidents are caused.
Therefore, in order to accurately measure the coal seam (residual) gas pressure, a coal seam gas pressure testing technology and equipment based on drilling sampling actual measurement need to be established, a method of combining underground sampling measurement of coal sample gas loss and laboratory gas pressure measurement is adopted, the influences of poor hole sealing effect and easy hole crossing in underground measurement are eliminated, the coal seam (residual) gas pressure can be effectively measured, workers can accurately judge whether the coal seam has outburst danger, and certain guiding significance is provided for the safety production of a mine.
SUMMERY OF THE UTILITY MODEL
To the not enough that exists on the prior art, this is novel to provide a coal seam gas pressure test system and method based on drilling sampling actual measurement.
In order to achieve the purpose, the novel solar cell module is realized by the following technical scheme:
a coal seam gas pressure test system based on drilling sampling actual measurement comprises a gas loss compensation device, a dead volume calibration device, a gas pressure measurement device, a dead volume filling device, a gas loss measurement device and a control system, wherein the gas pressure measurement device is respectively communicated with the gas loss compensation device, the dead volume calibration device, the dead volume filling device and the gas loss measurement device through a guide pipe, the control system is respectively electrically connected with the gas loss compensation device, the dead volume calibration device, the gas pressure measurement device, the dead volume filling device and the gas loss measurement device, at least one gas pressure measurement device is arranged, the gas pressure measurement device and the gas loss measurement device form a working group, all working groups are connected in parallel, and the guide pipe, the gas loss compensation device, the dead volume calibration device, the gas pressure measurement device and the gas loss measurement device are connected in parallel, The gas pressure measuring device, the dead volume filling device and the gas loss measuring device are communicated with each other through at least one control valve, and the control valve is electrically connected with the control system.
Further, gas loss compensation arrangement include methane bottle, methane relief pressure valve, pressure sensor, buffer tank, control valve and intercommunication pipeline, wherein methane bottle and methane relief pressure valve intercommunication to communicate through methane relief pressure valve and intercommunication pipeline, buffer tank at least one, each buffer tank is airtight cavity structures, and every buffer tank all establishes two water conservancy diversion mouths, and every water conservancy diversion mouth all communicates with a intercommunication pipeline through a control valve each other, among the intercommunication pipeline, one of them communicates with each other with methane relief pressure valve, another at least intercommunication pipeline communicates with the control valve each other, pressure sensor is a plurality of, is located respectively on each communicating pipe way.
Furthermore, the dead volume calibration device comprises a helium tank, a helium pressure reducing valve, a pressure sensor, at least one calibration tank, a control valve and a communication pipeline, wherein the helium tank is communicated with the helium pressure reducing valve and is communicated with the communication pipeline through the helium pressure reducing valve, each calibration tank is of a sealed cavity structure, each calibration tank is provided with two flow guide ports, each flow guide port is communicated with one communication pipeline through one control valve, at least one of the communication pipelines is communicated with the helium pressure reducing valve, the other communication pipeline is communicated with the control valve, and the pressure sensors are a plurality of and are respectively located on the communication pipelines.
Further, it is characterized in that: and when the number of the methane bottles and the number of the helium bottles are two or more, the methane bottles and the helium bottles are communicated with each other through collecting pipes respectively.
Further, the gas pressure measuring device comprises a pressure gauge, a pressure sensor, a temperature sensor, a detection tank, a thermostatic water bath mechanism, two-way joints, a control valve and a communication pipeline, wherein the pressure gauge is connected with the two-way joints and is mutually communicated with the detection tank through the two-way joints, the detection tank is of a closed cavity structure, the upper end surface of the detection tank is provided with at least three flow guide ports, one flow guide port is communicated with the two-way joints through the communication pipeline, the rest two flow guide ports are respectively communicated with the control valve through the communication pipeline and are respectively communicated with the gas loss compensation device and the dead volume calibration device through the control valve, the thermostatic water bath mechanism is covered on the outer surface of the detection tank, the two-way joints are further communicated with the control valve through the communication pipeline, the pressure sensors are respectively positioned in the communication pipelines and the detection tank, at least one temperature sensor is arranged, inlay in the detection jar and encircle detection jar axis equipartition.
Further, the dead volume filling device comprises a constant-flow pump, an oil cup, a two-way valve and a communicating pipeline, wherein the two-way valve is communicated with the constant-flow pump through the communicating pipeline, the constant-flow pump is communicated with the oil cup through the communicating pipeline, the two-way valve is communicated with the control valve through the communicating pipeline, and is communicated with the two-way joint of the gas pressure measuring device through the communicating valve and the flow guide pipe.
Further, gas loss volume measuring device include gas desorption appearance, coal sample jar, quick-operation joint, control valve and intercommunication pipeline, establish at least one control valve on the coal sample jar and communicate each other with the control valve, the control valve communicates each other with quick-operation joint through the intercommunication pipeline, just quick-operation joint communicates each other with gas desorption appearance.
Furthermore, the control system is a circuit system based on any one or two of an industrial computer and a personal computer, and at least one of the control system is provided with a network communication module.
The novel method for measuring the coal bed gas pressure by compensating the gas loss amount in the coal sample tank for measuring the gas pressure and utilizing the dead volume of the compensating device which is incompressible and can not be absorbed by coal bodies (such as silicon oil, organic oil, inorganic oil and the like) can restore the coal bed storage environment in the measuring process, eliminate the influence of the dead volume of the device on the gas pressure measuring result, eliminate the influence of factors such as poor hole sealing effect, easy hole crossing and the like in underground measurement, can accurately measure the coal bed gas pressure, ensure that a worker accurately judges the coal bed gas pressure value, and has certain guiding significance for preventing and controlling coal and gas outburst.
Drawings
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of the novel structure;
fig. 2 is a statistical graph of the experimental data of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and effects of the novel implementation easy to understand, the novel implementation is further described below with reference to the specific embodiments.
As shown in FIG. 1, a coal seam gas pressure testing system based on drilling sampling actual measurement comprises a gas loss compensation device 1, a dead volume calibration device 2, a gas pressure measuring device 3, a dead volume filling device 4, a gas loss measuring device 5 and a control system 6, wherein the gas pressure measuring device 3 is respectively communicated with the gas loss compensation device 1, the dead volume calibration device 2, the dead volume filling device 4 and the gas loss measuring device 5 through a guide pipe 7, the control system 6 is respectively electrically connected with the gas loss compensation device 1, the dead volume calibration device 2, the gas pressure measuring device 3, the dead volume filling device 4 and the gas loss measuring device 5, at least one gas pressure measuring device 3 is arranged, and the gas pressure measuring device 3 and one gas loss measuring device 1 form a working group, the working groups are connected in parallel, the guide pipe 7 is communicated with the gas loss compensation device 1, the dead volume calibration device 2, the gas pressure measuring device 3, the dead volume filling device 4 and the gas loss measuring device 5 through at least one control valve 8, and the control valve 8 is electrically connected with the control system 6.
Wherein, gas loss compensation arrangement 1 include methane bottle 11, methane relief pressure valve 12, pressure sensor 13, buffer tank 14, control valve 8 and communicating pipe 16, wherein methane bottle 11 and methane relief pressure valve 12 intercommunication to communicate with communicating pipe 16 through methane relief pressure valve 12, buffer tank 14 at least one, each buffer tank 14 are airtight cavity structures, and every buffer tank 14 all establishes two water conservancy diversion mouths, and every water conservancy diversion mouth all communicates with one communicating pipe 16 each other through a control valve 8, in the communicating pipe 16, at least one of them communicates with methane relief pressure valve 12 each other, another at least one communicating pipe 16 communicates with control valve 8 each other, pressure sensor 13 is a plurality of, is located each communicating pipe 16 respectively.
Meanwhile, the dead volume calibration device 2 comprises a helium tank 21, a helium pressure reducing valve 22, a pressure sensor 13, calibration tanks 23, control valves 8 and communication pipelines 16, wherein the helium tank 21 is communicated with the helium pressure reducing valve 22 and is communicated with the communication pipelines 16 through the helium pressure reducing valve 22, at least one of the calibration tanks 23 is of a sealed cavity structure, each calibration tank 23 is provided with two flow guide ports, each flow guide port is communicated with one communication pipeline 16 through one control valve 8, at least one of the communication pipelines 16 is communicated with the helium pressure reducing valve 22, the other communication pipeline 16 is communicated with the control valve 8, and the pressure sensors 13 are respectively positioned on the communication pipelines 16.
Further optimized, characterized in that: the methane bottle 11 and the helium bottle 12 are at least one, and when the number of the methane bottle 11 and the number of the helium bottle 12 are two or more, the methane bottle 11 and the helium bottle 12 are communicated with each other through collecting pipes.
In addition, the gas pressure measuring device 3 comprises a pressure gauge 31, a pressure sensor 13, a temperature sensor 32, a detection tank 33, a thermostatic water bath mechanism 34, a two-way joint 35, a control valve 8 and a communication pipeline 16, wherein the pressure gauge 31 is connected with the two-way joint 35 and is mutually communicated with the detection tank 33 through the two-way joint 35, the detection tank 33 is of a closed cavity structure, at least three diversion ports are arranged on the upper end surface of the detection tank 33, one diversion port is communicated with the two-way joint 35 through the communication pipeline 16, the remaining two diversion ports are respectively communicated with the control valve 8 through the communication pipeline 16 and are respectively communicated with the gas loss compensation device 1 and the dead volume calibration device 2 through the control valve 8, the thermostatic water bath mechanism 34 is coated on the outer surface of the detection tank 33, the two-way joint 35 is also mutually communicated with the control valve 8 through the communication pipeline 16, the pressure sensors 13 are a plurality of, the temperature sensors 32 are respectively positioned in the communication pipelines 16 and the detection tank 33, and at least one temperature sensor is embedded in the detection tank 32 and uniformly distributed around the axis of the detection tank 33.
In this embodiment, the dead volume filling device 4 includes a constant-flow pump 41, an oil cup 42, a two-way valve 35, and a communication pipeline 16, where the two-way valve 35 is communicated with the constant-flow pump 41 through the communication pipeline 16, the constant-flow pump 41 is communicated with the oil cup 42 through the communication pipeline 16, the two-way valve 35 is further communicated with the control valve 8 through the communication pipeline 16, and is communicated with the two-way joint 35 of the gas pressure measuring device 3 through the communication valve 8 and the draft tube 7.
Preferably, the oil in the oil cup is any one of oil which is compressible and can not be absorbed by coal, such as silicone oil, organic oil and inorganic oil.
In this embodiment, the gas loss measuring device 5 includes a gas desorption instrument 51, a coal sample tank 52, a quick coupling 53, a control valve 8 and a communication pipeline 16, at least one control valve 8 is arranged on the coal sample tank 52 and is communicated with the control valve 8, the control valve 8 is communicated with the quick coupling 53 through the communication pipeline 16, and the quick coupling 53 is communicated with the gas desorption instrument 51.
In this embodiment, the control system 6 is a circuit system based on one or two of an industrial computer and a personal computer, and at least one of the control system is provided with a network communication module.
A test method of a coal bed gas pressure test system based on drilling sampling actual measurement comprises the following steps:
s1, assembling equipment, namely, assembling and connecting a gas loss compensation device, a dead volume calibration device, a gas pressure measurement device, a dead volume filling device, a gas loss measurement device and a control system to form a complete experiment system;
s2, setting initially, ensuring that each control valve of the gas loss compensation device, the dead volume calibration device, the gas pressure measurement device, the dead volume filling device and the gas loss measurement device is in a closed state before the experiment begins, then opening a helium gas steel cylinder control valve, adjusting a helium pressure reducing valve to ensure that the outlet pressure is not more than the range of the pressure sensor, flushing nitrogen into the calibration tank, and recording the pressure indication P in the control system after the indication displayed on a computer by the pressure sensor is stable1Then opening the control valve again, conveying the nitrogen in the calibration tank to the detection tank of the gas pressure measurement device, and recording the pressure value P in the calibration tank at the moment after the pressure in the calibration tank and the detection tank is stable as displayed by the precision pressure sensor2Then, according to the calculation function:
P1V1/Z1＝P2V2/Z2；
wherein:
Z1is P1The compressibility of helium under conditions;
Z2is P2The compressibility of helium under conditions;
the volume V of free nitrogen in the pipeline between the detection tank and the calibration tank can be obtained0＝V2—V1；
After the calibration is finished, opening the control valve to release helium gas, and sealing the calibration tank and the detection tank again after the nitrogen gas is released;
s3, sampling and prefabricating, detaching the gas pressure measuring device and the gas loss measuring device from the same way under the experiment, and then weighing the gas pressure measuring device and the gas loss measuring device integrally:
wherein the mass M of the control valve, the pressure gauge, the two-way valve, the detection tank and the pipeline communicated between the components of the gas pressure measuring device is integrally weighed1；
Integrally weighing mass M of quick connector, control valve, coal sample tank and pipeline communicated among components2；
Then the gas pressure measuring device and the gas loss measuring device are brought into the underground together.
S4, sampling, namely according to the coal bed gas content underground direct determination method (AQ1066-2008) of the safety production industry standard of the people' S republic of China, constructing a drill hole on the newly exposed coal wall of the mining working face in a way of being vertical to the coal wall by using an electric coal drill, starting sampling when the drill hole is drilled to a preset position, and recording the sampling starting time t1Dividing the collected fresh coal sample into two parts, respectively filling the two parts into a sampling tank and a coal sample tank, integrally weighing the weight of the gas pressure measuring device and recording the weight as M3The weight of the gas loss measuring device was weighed as a whole and recorded as M4Then calculating the mass M of the coal sample filled in the sampling tank5，(M5＝M3-M1) Mass M of coal sample charged into coal sample tank6，(M6＝M4-M2) (ii) a Simultaneously recording the time t when the coal sample begins to be desorbed after being canned2Measuring the accumulated gas desorption amount V of the coal samples of the coal sample tanks at different accumulated time intervals t by using a gas desorption instrument, wherein the measuring time is 1-2 hours;
s5, calculating the gas loss, selecting
Method, according to the exposure of the coal sample for a period of time V and
(t0＝t2-t1) Is determined in a straight line relationship, namely:
in the formula:
cumulative gas desorption in cm over time V-t3；
V1 is decreasedExposure time t0Internal gas loss in cm3；
K is the coefficient;
the exposure time before desorption measurement of the coal sample is (t)0＝t2-t1) The desorption time corresponding to the V value measured under different accumulated time intervals t is t0+ t; to be provided with
The horizontal coordinate and the vertical coordinate are used for drawing, the measuring points in a linear relation are judged from the drawing, then the gas loss amount is obtained according to the coordinate values of the measuring points by a least square method, and the gas loss amount V 'of coal per unit mass is calculated'1 is decreased 
S6, calculating the gas loss of the coal sample, connecting the gas pressure measuring system to the experimental system formed in the step S1 again, and calculating the gas loss V of the coal sample in the gas pressure measuring system2 loss of(V2 loss of＝M5×V′1 is decreased) And calculating the amount of the substance N of the gas loss amount according to PV ═ NRTDecrease in the thickness of the steelNamely:
in the formula:
Pwell-downhole atmospheric pressure, MPa;
V2 loss ofExposure time t0Internal gas loss in cm3；
T-downhole temperature
R is constant, 8.314 is taken;
meanwhile, recording the pressure gauge reading P at the moment after the pressure gauge reading is stable3And calculating the amount N of the existing free gas in the coal sample tank (11) according to PV ═ NRTNow thatNamely:
in the formula:
P3-the indication of the pressure gauge (9), MPa;
V0-the free volume of the line between the control valve (8) and the control valve (12) (including the coal sample tank (25)), cm 3;
V3dead volume of coal, cm3；
T-downhole temperature, K
R is constant, 8.314 is taken;
then, based on PV-NRT, the sample tank charge V is predicted2 loss ofAfter that, the indication P of the pressure gauge (9)4Namely:
in the formula:
Nnow that-the amount of free gas present, mol, in the coal sample tank (11);
Ndecrease in the thickness of the steel-the amount of mass lost in gas, mol;
t-downhole temperature, K
R is constant, 8.314 is taken;
V0-free volume of the line between the control valve (8) and the control valve (12) (including the coal sample tank (25)), cm 3;
V3dead volume of coal, cm3；
S7, methane modulation based on the calibration tank volume V4According to P1V1/Z1＝P2V2/Z2(Z1Is P1Compression factor of methane under the conditions, Z2Is P2Compression coefficient of methane under the condition), calculating gas to be filled in the calibration tankPressure of
Then opening the methane gas steel cylinder, adjusting the methane pressure reducing valve and making the pressure in the buffer tank reach the gas pressure P5Then the methane gas steel cylinder is closed, the buffer tank is communicated with the detection tank, and meanwhile, the pressure sensor detects that the methane pressure is P5When the detection tank is connected with the cache tank, the connection between the cache tank and the detection tank is closed and disconnected;
s8, performing oil injection operation, opening the constant flow pump, and injecting oil into the detection tank through the constant flow pump, wherein the injected oil quantity value is (V)0-V3) And the oil quantity value injected into the detection tank reaches (V)0-V3) Stopping oiling and closing the detection tank after the value is reached;
s9, obtaining parameters, reading the pressure value P in the detection tank at the moment after completing the operation of S8 and after the pointer of the pressure gauge is stable6Then P is6Namely the coal bed gas pressure value.
The novel method for measuring the coal bed gas pressure by compensating the gas loss amount in the coal sample tank for measuring the gas pressure and utilizing the dead volume of the compensating device which is incompressible and can not be absorbed by coal bodies (such as silicon oil, organic oil, inorganic oil and the like) can restore the coal bed storage environment in the measuring process, eliminate the influence of the dead volume of the device on the gas pressure measuring result, eliminate the influence of factors such as poor hole sealing effect, easy hole crossing and the like in underground measurement, can accurately measure the coal bed gas pressure, ensure that a worker accurately judges the coal bed gas pressure value, and has certain guiding significance for preventing and controlling coal and gas outburst.
It should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments. The foregoing embodiments and description have been made only to illustrate the principles of the invention. Various changes and modifications can be made without departing from the spirit and scope of the invention. Such changes and modifications are intended to be within the scope of the present invention as claimed. The scope of the present novel claims is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a coal seam gas pressure test system based on drilling sampling actual measurement which characterized in that: the coal seam gas pressure test system based on drilling sampling actual measurement comprises a gas loss compensation device, a dead volume calibration device, a gas pressure measurement device, a dead volume filling device, a gas loss measurement device and a control system, wherein the gas pressure measurement device is respectively communicated with the gas loss compensation device, the dead volume calibration device, the dead volume filling device and the gas loss measurement device through a guide pipe, the control system is respectively electrically connected with the gas loss compensation device, the dead volume calibration device, the gas pressure measurement device, the dead volume filling device and the gas loss measurement device, at least one gas pressure measurement device is arranged, the gas pressure measurement device and the gas loss measurement device form a working set, all working sets are connected in parallel, the guide pipe, the gas loss compensation device, the dead volume filling device and the gas loss measurement device are connected in parallel, and the guide pipe, the gas pressure measurement device, the dead volume filling device and the control system are connected in parallel, The dead volume calibration device, the gas pressure measurement device, the dead volume filling device and the gas loss measurement device are communicated with each other through at least one control valve, and the control valve is electrically connected with a control system.
2. The system for testing the coal bed gas pressure based on the actual measurement of the borehole sampling according to claim 1, characterized in that: the gas loss compensation device comprises a methane bottle, a methane pressure reducing valve, a pressure sensor, at least one buffer tank, a control valve and a communicating pipeline, wherein the methane bottle is communicated with the methane pressure reducing valve and is communicated with the communicating pipeline through the methane pressure reducing valve, each buffer tank is of an airtight cavity structure, each buffer tank is provided with two flow guide ports, each flow guide port is communicated with one communicating pipeline through one control valve, at least one of the flow guide ports is communicated with the methane pressure reducing valve, at least one other communicating pipeline is communicated with the control valve, and the pressure sensor is a plurality of pressure sensors and is respectively located on each communicating pipeline.
3. The system for testing the coal bed gas pressure based on the actual measurement of the borehole sampling according to claim 1, characterized in that: the dead volume calibration device comprises a helium tank, a helium pressure reducing valve, pressure sensors, calibration tanks, control valves and communication pipelines, wherein the helium tank is communicated with the helium pressure reducing valve and is communicated with the communication pipelines through the helium pressure reducing valve, at least one calibration tank is of a sealed cavity structure, each calibration tank is provided with two flow guide ports, each flow guide port is communicated with one communication pipeline through one control valve, at least one of the flow guide ports is communicated with the helium pressure reducing valve in the communication pipelines, the other at least one communication pipeline is communicated with the control valves, and the pressure sensors are a plurality of and are respectively located on the communication pipelines.
4. The system for testing the coal bed gas pressure measured based on the borehole sampling as claimed in claim 2 or 3, wherein: and when the number of the methane bottles and the number of the helium bottles are two or more, the methane bottles and the helium bottles are communicated with each other through collecting pipes respectively.
5. The system for testing the coal bed gas pressure based on the actual measurement of the borehole sampling according to claim 1, characterized in that: the gas pressure measuring device comprises a pressure gauge, a pressure sensor, a temperature sensor, a detection tank, a thermostatic water bath mechanism, two-way joints, a control valve and a communication pipeline, wherein the pressure gauge is connected with the two-way joints and is mutually communicated with the detection tank through the two-way joints, the detection tank is of a closed cavity structure, at least three flow guide ports are arranged on the upper end surface of the detection tank, one flow guide port is communicated with the two-way joints through the communication pipeline, the rest two flow guide ports are respectively communicated with the control valve through the communication pipeline and are respectively communicated with a gas loss compensation device and a dead volume calibration device through the control valve, the thermostatic water bath mechanism is coated on the outer surface of the detection tank, the two-way joints are further communicated with the control valve through the communication pipeline, the pressure sensors are respectively positioned in the communication pipeline and the detection tank, and the temperature sensor is at least one, inlay in the detection jar and encircle detection jar axis equipartition.
6. The system for testing the coal bed gas pressure based on the actual measurement of the borehole sampling according to claim 1, characterized in that: the dead volume filling device comprises a constant flow pump, an oil cup, a two-way valve and a communicating pipeline, wherein the two-way valve is communicated with the constant flow pump through the communicating pipeline, the constant flow pump is communicated with the oil cup through the communicating pipeline, the two-way valve is communicated with a control valve through the communicating pipeline, and is communicated with a two-way joint of the gas pressure measuring device through the communicating valve and a flow guide pipe.
7. The system for testing the coal bed gas pressure based on the actual measurement of the borehole sampling according to claim 1, characterized in that: gas loss volume measuring device include gas desorption appearance, coal sample jar, quick-operation joint, control valve and intercommunication pipeline, establish at least one control valve on the coal sample jar and communicate each other with the control valve, the control valve communicates each other with quick-operation joint through the intercommunication pipeline, just quick-operation joint communicates each other with gas desorption appearance.
8. The system for testing the coal bed gas pressure based on the actual measurement of the borehole sampling according to claim 1, characterized in that: the control system is a circuit system based on the sharing of any one or two of an industrial computer and a personal computer, and at least one of the control system is provided with a network communication module.
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| CN110108850A (en) * | 2019-05-30 | 2019-08-09 | 河南理工大学 | A kind of coal-bed gas pressure test macro and method based on drilling sampling actual measurement |
| CN110108850B (en) * | 2019-05-30 | 2024-02-20 | 河南理工大学 | Coal seam gas pressure testing system and method based on drilling sampling actual measurement |
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