CN110108850B - Coal seam gas pressure testing system and method based on drilling sampling actual measurement - Google Patents
Coal seam gas pressure testing system and method based on drilling sampling actual measurement Download PDFInfo
- Publication number
- CN110108850B CN110108850B CN201910461321.4A CN201910461321A CN110108850B CN 110108850 B CN110108850 B CN 110108850B CN 201910461321 A CN201910461321 A CN 201910461321A CN 110108850 B CN110108850 B CN 110108850B
- Authority
- CN
- China
- Prior art keywords
- gas
- tank
- pressure
- control valve
- communicated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003245 coal Substances 0.000 title claims abstract description 135
- 238000005259 measurement Methods 0.000 title claims abstract description 35
- 238000005070 sampling Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000005553 drilling Methods 0.000 title claims abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 237
- 238000004891 communication Methods 0.000 claims description 72
- 238000001514 detection method Methods 0.000 claims description 59
- 239000001307 helium Substances 0.000 claims description 41
- 229910052734 helium Inorganic materials 0.000 claims description 41
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 41
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 238000003795 desorption Methods 0.000 claims description 21
- 238000009530 blood pressure measurement Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005065 mining Methods 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000009924 canning Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000003860 storage Methods 0.000 abstract description 3
- 238000009417 prefabrication Methods 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011545 laboratory measurement Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012502 risk assessment Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/222—Solid fuels, e.g. coal
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Food Science & Technology (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a coal seam gas pressure testing system based on drilling sampling actual measurement, which comprises a gas loss amount compensation device, a dead volume calibration device, a gas pressure measuring device, a dead volume filling device, a gas loss amount measuring device and a control system, wherein the gas pressure measuring device is communicated with the gas loss amount compensation device, the dead volume calibration device, the dead volume filling device and the gas loss amount measuring device through a flow guide pipe respectively; the testing method comprises nine steps of equipment assembly, preliminary test, equipment prefabrication, sampling, calculating the gas loss of the coal sample, prefabricating methane, oiling and reading a final value. The invention can restore the coal seam storage environment in the measuring process, eliminates the influence of the dead volume of the device on the gas pressure measuring result, eliminates the influence of factors such as poor sealing effect, easy hole stringing and the like in underground measurement, and can accurately measure the gas pressure of the coal seam.
Description
Technical Field
The invention relates to a coal seam gas pressure testing technology and equipment based on drilling sampling actual measurement, and belongs to the technical field of coal mine safety.
Background
The coal and gas outburst is closely related to the coal seam gas pressure, so that the coal and gas outburst can seriously damage underground production facilities, huge economic losses are caused to countries and enterprises, 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. Requirements of "regulations for prevention and treatment of coal and gas outburst": in the feasibility research stage of the newly built mine, all coal beds with average thickness of more than 0.3m possibly revealed by mining engineering in the mine should be subjected to outstanding risk assessment; the coal mine enterprises with the protruding mines and the protruding mines should formulate regional comprehensive anti-protruding measures and local comprehensive anti-protruding measures according to the actual conditions and conditions of the protruding mines. The gas pressure is an index for evaluating, predicting the risk of coal seam outburst and checking the effect of regional outburst elimination measures. The coal seam meeting one of the following requirements of the regulations for preventing and curing outburst of coal and gas is treated as an outburst coal seam, namely the gas content is more than or equal to 8m 3 The pressure of the gas or the t is more than or equal to 0.74MPa. However, in the actual environment, the conditions of small gas pressure of the coal seam to be tested and large gas content exist, and the underground drilling coal seam gas pressure test 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 effect of the outburst prevention measures in the pre-drainage coal seam gas area is checked, the arranged drainage drilling holes are easy to be connected with the pressure measuring holes in series, so that the measured residual gas pressure value is smaller than the 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 gas pressure of the coal seam (residual), it is necessary to establish a coal seam gas pressure test technology and equipment based on the actual measurement of drilling sampling, and the method of combining the underground sampling measurement of the loss gas quantity of the coal sample and the laboratory measurement of the gas pressure is adopted, so that the influence of poor hole sealing effect and easy hole stringing in underground measurement is eliminated, the coal seam (residual) gas pressure can be effectively measured, the working personnel can accurately judge whether the coal seam has outstanding danger, and a certain guiding significance is brought to the safety production of a mine.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a coal seam gas pressure testing system and method based on actual measurement of drilling sampling.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the utility model provides a coal seam gas pressure test system based on drilling sampling actual measurement, including gas loss compensation arrangement, dead volume calibration device, gas pressure measurement device, dead volume filling device, gas loss measurement device and control system, wherein gas pressure measurement device is with gas loss compensation arrangement respectively, dead volume calibration device, dead volume filling device, gas loss measurement device intercommunication each other through the honeycomb duct, control system is with gas loss compensation arrangement respectively, dead volume calibration device, gas pressure measurement device, dead volume filling device, gas loss measurement device electric connection, wherein gas pressure measurement device is at least one, and gas pressure measurement device constitutes a work group with a gas loss measurement device, each work group is parallelly connected each other, honeycomb duct and gas loss compensation arrangement, dead volume calibration device, gas pressure measurement device, dead volume filling device, gas loss measurement device all are through at least one control valve intercommunication each other, and control valve and control system electric connection.
Further, the gas loss amount compensation device comprises a methane bottle, a methane pressure reducing valve, a pressure sensor, buffer tanks, a control valve and a communication pipeline, wherein the methane bottle is communicated with the methane pressure reducing valve and is communicated with the communication pipeline through the methane pressure reducing valve, at least one buffer tank is of a closed cavity structure, each buffer tank is provided with two diversion openings, each diversion opening is communicated with one communication pipeline through the control valve, at least one of the communication pipelines is communicated with the methane pressure reducing valve, at least one other communication pipeline is communicated with the control valve, and the pressure sensor is located on each communication pipeline.
Further, the dead volume calibration device comprises a helium bottle, a helium pressure reducing valve, a pressure sensor, calibration tanks, a control valve and a communication pipeline, wherein the helium bottle is communicated with the helium pressure reducing valve and is communicated with the communication pipeline through the helium pressure reducing valve, at least one of the calibration tanks is of a closed cavity structure, each calibration tank is provided with two diversion openings, each diversion opening is communicated with one communication pipeline through the control valve, at least one of the communication pipelines is communicated with the helium pressure reducing valve, at least one other communication pipeline is communicated with the control valve, and the pressure sensor is located on each communication pipeline.
Further, it is characterized in that: and when the number of the methane cylinders and the helium cylinders is two or more, the methane cylinders and the helium cylinders are communicated with each other through the collecting pipes respectively.
Further, gas pressure measuring device include manometer, pressure sensor, temperature sensor, detection jar, thermostatic waterbath mechanism, two-way joint, control valve and intercommunication pipeline, the manometer links to each other with two-way joint to communicate each other with the detection jar through two-way joint, the detection jar is airtight cavity structure, and at least three water conservancy diversion mouth is established to its up end, and one of them water conservancy diversion mouth communicates with two-way joint through the intercommunication pipeline, and the remaining two water conservancy diversion mouths communicate each other with the control valve through the intercommunication pipeline respectively to communicate each other with gas loss compensation arrangement, dead volume calibration device through the control valve respectively, thermostatic waterbath mechanism cladding is at the detection jar surface, two-way joint communicates each other with the control valve through the intercommunication pipeline in addition, pressure sensor is a plurality of, is located each intercommunication pipeline and detection jar respectively, at least one of temperature sensor inlays in the detection jar and encircles the detection jar axis equipartition.
Further, the dead volume filling device comprises a advection pump, an oil cup, two-way valves and a communication pipeline, wherein the two-way valves are mutually communicated with the advection pump through the communication pipeline, the advection pump is mutually communicated with the oil cup through the communication pipeline, the two-way valves are mutually communicated with the control valve through the communication pipeline, and the two-way valves are mutually communicated with two-way joints of the gas pressure measuring device through the communication valve and the guide pipe.
Further, the gas loss measurement device comprises a gas desorption instrument, a coal sample tank, a quick connector, a control valve and a communication pipeline, wherein at least one control valve is arranged on the coal sample tank and is communicated with the control valve, the control valve is communicated with the quick connector through the communication pipeline, and the quick connector is communicated with the gas desorption instrument.
Further, 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 network communication module is arranged in the control system.
A test method of a coal seam gas pressure test system based on drilling sampling actual measurement comprises the following steps:
s1, assembling equipment, namely firstly 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 experimental system;
s2, initially setting, ensuring that each control valve of a gas loss compensation device, a dead volume calibration device, a gas pressure measurement device, a dead volume filling device and a gas loss measurement device is in a closed state before an experiment starts, then opening a helium gas steel cylinder control valve, adjusting a helium gas pressure reducing valve to ensure that the gas outlet pressure is not greater than the measuring range of a pressure sensor, flushing nitrogen into a calibration tank, and recording the pressure indication P at the moment in a control system after the indication displayed on a computer through the pressure sensor is stable 1 Then the control valve is opened again, nitrogen in the calibration tank is conveyed into the detection tank of the gas pressure measuring device, and after the accuracy pressure sensor displays that the pressure in the calibration tank and the pressure in the detection tank are stable, the pressure value P in the calibration tank at the moment is recorded 2 Then according to the calculation function:
P 1 V 1 /Z 1 ＝P 2 V 2 /Z 2 ；
wherein:
Z 1 is P 1 The compression coefficient of helium under conditions;
Z 2 is P 2 The compression coefficient of helium under conditions;
the volume V of free nitrogen in the pipeline between the detection tank and the calibration tank can be obtained 0 ＝V 2 -V 1 ；
After the calibration is finished, opening a control valve to release helium gas, and sealing the calibration tank and the detection tank again after the nitrogen release is finished;
s3, sampling and prefabricating, namely detaching the gas pressure measuring device and the gas loss measuring device from the experiment, and then weighing the gas pressure measuring device and the gas loss measuring device integrally:
wherein the mass M of the pipeline communicated between the control valve, the pressure gauge, the two-way detection tank and the components of the integral weighing gas pressure measuring device 1 ；
Mass M of pipeline for integrally weighing quick joint, control valve, coal sample tank and communication between components 2 ；
The gas pressure measuring device is then brought downhole together with the gas loss measuring device.
S4, sampling, namely constructing a drilling hole on the newly exposed coal wall of the mining working face by using a coal electric drill to perpendicularly drill the coal wall, starting sampling when drilling to a preset position, and recording sampling starting time t according to the coal seam gas content underground direct measurement method (AQ 1066-2008) of the safety production industry standard of the people' S republic of China 1 Dividing the collected fresh coal sample into two parts, respectively loading the two parts into a sampling tank and a coal sample tank, and integrally weighing the weight of the gas pressure measuring device and marking the weight as M 3 The gas loss amount measuring device was weighed as a whole and recorded as M 4 Then calculate the mass M of the coal sample in the sampling tank 5 ，(M 5 ＝M 3 -M 1 ) Quality of coal sample filled in coal sample tankM 6 ，(M 6 ＝M 4 -M 2 ) The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously record the time t when the coal sample starts to desorb after canning 2 Measuring the accumulated gas desorption quantity V of the coal sample in the coal sample tank at different accumulated time intervals t by using a gas desorption instrument, wherein the measuring time is 1-2 hours;
s5, calculating the loss of gas, and selectingV and +.A method is provided, according to the initial exposure of coal sample for a period of time>Is determined in a linear relation, namely:
wherein:
v-cumulative gas desorption in t time cm 3 ；
V Damage 1 Exposure time t 0 The loss of gas in cm 3 ；
K is a coefficient;
the exposure time before the determination of the desorption of the coal sample was (t) 0 ＝t 2 -t 1 ) The desorption time corresponding to the V value measured at different accumulation time intervals t is t 0 +t; to be used forDrawing the abscissa and the ordinate, determining each measuring point in a linear relation by the drawing, then obtaining the gas loss according to the least square method according to the coordinate value of the measuring point, and calculating the gas loss of coal per unit mass>
S6, calculating the gas loss of the coal sample, re-connecting the gas pressure measuring system into the experimental system formed in the step S1, and then calculating the gas pressureDetermining the gas loss quantity V of coal sample in system Loss 2 (V Loss 2 ＝M 5 ×V′ Damage 1 ) And calculates the amount N of the substance of the gas loss amount from pv=nrt Damage to The method comprises the following steps:
wherein:
P well -downhole atmospheric pressure, MPa;
V loss 2 Exposure time t 0 The loss of gas in cm 3 ；
T-downhole temperature;
r is a constant, 8.314 is taken;
meanwhile, after the pressure representation number is stable, the pressure representation number P at the moment is recorded 3 And calculating the amount N of the substances of the free gas existing in the coal sample tank (11) according to PV=NRT At present The method comprises the following steps:
wherein:
P 3 -gauge (9) indication, MPa;
V 0 -free volume of the piping (including the coal sample tank (25)) between the control valve (8) and the control valve (12), cm 3 ；
V 3 Dead volume of coal, cm 3 ；
T-downhole temperature;
r is a constant, 8.314 is taken;
then, according to pv=nrt, the prediction sampling tank is filled with V Loss 2 After that, the indication P of the pressure gauge (9) 4 The method comprises the following steps:
wherein:
N at present -the amount, mol, of the substances present in the coal sample tank (11) of free gas;
N damage to -the amount of substance losing the amount of gas, mol;
t-downhole temperature;
r is a constant, 8.314 is taken;
V 0 -free volume of the piping (including the coal sample tank (25)) between the control valve (8) and the control valve (12), cm 3 ；
V 3 Dead volume of coal, cm 3 ；
S7, methane modulation based on the calibration tank volume V 4 According to P 1 V 1 /Z 1 ＝P 2 V 2 /Z 2 (Z 1 Is P 1 Compression coefficient of methane under the condition Z 2 Is P 2 Compression coefficient of methane under the condition), and calculating the gas pressure to be filled in the calibration tankThen opening the methane gas steel cylinder, regulating the methane pressure reducing valve and leading the pressure in the buffer tank to reach the gas pressure P 5 Then closing the methane gas steel cylinder, and communicating the buffer tank with the detection tank, while the pressure sensor detects that the methane pressure is P 5 When the buffer tank is disconnected, the detection tank is connected with the detection tank;
s8, oiling operation, namely opening a advection pump, and oiling the detection tank through the advection pump, wherein the injection oil quantity value is (V) 0 -V 3 ) And the oil quantity value is injected into the detection tank to reach (V) 0 -V 3 ) Stopping oiling and closing the detection tank after the value is obtained;
s9, acquiring parameters, after finishing S8 operation and after stabilizing the pointer of the pressure gauge, reading the pressure value P in the detection tank at the moment 6 P is then 6 The gas pressure value of the coal bed is obtained.
The invention can restore the coal seam gas pressure by compensating the gas loss amount in the coal sample tank for measuring the gas pressure and measuring the coal seam gas pressure by utilizing the method of compensating the dead volume of a device which is incompressible and is not adsorbed by coal (such as silicone oil, organic oil, inorganic oil and the like), thereby restoring the coal seam storage environment in the measuring process, eliminating the influence of the dead volume of the device on the gas pressure measuring result, eliminating the influence of factors such as poor hole sealing effect, easy hole crossing and the like in underground measurement, accurately measuring the coal seam gas pressure, enabling staff to accurately judge the coal seam gas pressure value and playing a certain guiding significance for preventing and controlling coal and gas outburst.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a flow chart of the experimental method of the present invention;
FIG. 3 is a statistical chart of experimental data of the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
The coal seam gas pressure testing system based on the borehole sampling actual measurement as shown in fig. 1 comprises a gas loss compensation device 1, a dead volume calibration device 2, a gas pressure measurement device 3, a dead volume filling device 4, a gas loss measurement device 5 and a control system 6, wherein the gas pressure measurement 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 measurement device 5 through a flow 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 measurement device 3, the dead volume filling device 4 and the gas loss measurement device 5, at least one of the gas pressure measurement device 3 and one of the gas loss measurement device 1 form a working group, the flow guide pipe 7 is mutually connected with the gas loss compensation device 1, the dead volume calibration device 2, the gas pressure measurement device 3, the dead volume filling device 4 and the gas loss measurement device 5 through at least one control valve 8, and the control system 8 is electrically connected with the control system 6.
The gas loss compensation device 1 comprises a methane bottle 11, a methane pressure reducing valve 12, a pressure sensor 13, buffer tanks 14, a control valve 8 and a communication pipeline 16, wherein the methane bottle 11 is communicated with the methane pressure reducing valve 12 and is communicated with the communication pipeline 16 through the methane pressure reducing valve 12, at least one buffer tank 14 is of a closed cavity structure, each buffer tank 14 is provided with two diversion openings, each diversion opening is mutually communicated with one communication pipeline 16 through one control valve 8, at least one of the communication pipelines 16 is mutually communicated with the methane pressure reducing valve 12, and at least one other communication pipeline 16 is mutually communicated with the control valve 8, and the pressure sensors 13 are respectively positioned on the communication pipelines 16.
Meanwhile, the dead volume calibration device 2 comprises a helium bottle 21, a helium pressure reducing valve 22, a pressure sensor 13, calibration tanks 23, a control valve 8 and a communication pipeline 16, wherein the helium bottle 21 is communicated with the helium pressure reducing valve 22 and is communicated with the communication pipeline 16 through the helium pressure reducing valve 22, at least one of the calibration tanks 23 is of a closed cavity structure, each calibration tank 23 is provided with two diversion openings, each diversion opening is mutually communicated with one communication pipeline 16 through one control valve 8, at least one of the communication pipelines 16 is mutually communicated with the helium pressure reducing valve 22, and at least one other communication pipeline 16 is mutually communicated with the control valve 8, and the pressure sensors 13 are respectively positioned on the communication pipelines 16.
Further preferably, the method is characterized in that: at least one of the methane bottle 11 and the helium bottle 12, and when the number of the methane bottle 11 and the helium bottle 12 is two or more, the methane bottles 11 and the helium bottles 12 are respectively communicated with each other through the 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 constant-temperature water bath mechanism 34, two-way connectors 35, a control valve 8 and a communication pipeline 16, wherein the pressure gauge 31 is connected with the two-way connectors 35 and is mutually communicated with the detection tank 33 through the two-way connectors 35, the detection tank 33 is of a closed cavity structure, at least three diversion ports are arranged on the upper end face of the detection tank 33, one diversion port is communicated with the two-way connectors 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 constant-temperature water bath mechanism 34 is coated on the outer surface of the detection tank 33, the two-way connectors 35 are respectively and mutually communicated with the control valve 8 through the communication pipeline 16, the pressure sensor 13 is respectively positioned in each communication pipeline 16 and the detection tank 33, and at least one temperature sensor 32 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 advection pump 41, an oil cup 42, a two-way valve 35, and a communication pipeline 16, wherein the two-way valve 35 is mutually communicated with the advection pump 41 through the communication pipeline 16, the advection pump 41 is mutually communicated with the oil cup 42 through the communication pipeline 16, and the two-way valve 35 is mutually communicated with the control valve 8 through the communication pipeline 16, and is mutually communicated with the two-way joint 35 of the gas pressure measuring device 3 through the communication valve 8 and the flow guiding pipe 7.
Further preferably, the oil in the oil cup is any one of the compressible oil, organic oil, inorganic oil and the like, and the oil is not adsorbed by the coal body.
In this embodiment, the gas loss measuring device 5 includes a gas desorption apparatus 51, a coal sample tank 52, a quick connector 53, a control valve 8 and a communication pipeline 16, at least one control valve 8 is disposed on the coal sample tank 52 and is mutually communicated with the control valve 8, the control valve 8 is mutually communicated with the quick connector 53 through the communication pipeline 16, and the quick connector 53 is mutually communicated with the gas desorption apparatus 51.
In this embodiment, the control system 6 is a circuit system based on any one or two of an industrial computer and a personal computer, and at least one network communication module is provided in the control system.
As shown in fig. 2 and 3, a testing method of a coal seam gas pressure testing system based on drilling sampling actual measurement comprises the following steps:
s1, assembling equipment, namely firstly 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 experimental system;
s2, initially setting, ensuring that each control valve of a gas loss compensation device, a dead volume calibration device, a gas pressure measurement device, a dead volume filling device and a gas loss measurement device is in a closed state before an experiment starts, then opening a helium gas steel cylinder control valve, adjusting a helium gas pressure reducing valve to ensure that the gas outlet pressure is not greater than the measuring range of a pressure sensor, flushing nitrogen into a calibration tank, and recording the pressure indication P at the moment in a control system after the indication displayed on a computer through the pressure sensor is stable 1 Then the control valve is opened again, nitrogen in the calibration tank is conveyed into the detection tank of the gas pressure measuring device, and after the accuracy pressure sensor displays that the pressure in the calibration tank and the pressure in the detection tank are stable, the pressure value P in the calibration tank at the moment is recorded 2 Then according to the calculation function:
P 1 V 1 /Z 1 ＝P 2 V 2 /Z 2 ；
wherein:
Z 1 is P 1 The compression coefficient of helium under conditions;
Z 2 is P 2 The compression coefficient of helium under conditions;
the volume V of free nitrogen in the pipeline between the detection tank and the calibration tank can be obtained 0 ＝V 2 -V 1 ；
After the calibration is finished, opening a control valve to release helium gas, and sealing the calibration tank and the detection tank again after the nitrogen release is finished;
s3, sampling and prefabricating, namely detaching the gas pressure measuring device and the gas loss measuring device from the same experiment, and then weighing the gas pressure measuring device and the gas loss measuring device integrally;
wherein the mass M of the pipeline communicated between the control valve, the pressure gauge, the two-way detection tank and the components of the integral weighing gas pressure measuring device 1 ；
Integral weighing quick connector and controlValve making, coal sample tank and mass M of pipeline communicated between components 2 ；
The gas pressure measuring device is then brought downhole together with the gas loss measuring device.
S4, sampling, namely constructing a drilling hole on the newly exposed coal wall of the mining working face by using a coal electric drill to perpendicularly drill the coal wall, starting sampling when drilling to a preset position, and recording sampling starting time t according to the coal seam gas content underground direct measurement method (AQ 1066-2008) of the safety production industry standard of the people' S republic of China 1 Dividing the collected fresh coal sample into two parts, respectively loading the two parts into a sampling tank and a coal sample tank, and integrally weighing the weight of the gas pressure measuring device and marking the weight as M 3 The gas loss amount measuring device was weighed as a whole and recorded as M 4 Then calculate the mass M of the coal sample in the sampling tank 5 ，(M 5 ＝M 3 -M 1 ) Mass M of coal sample loaded in coal sample tank 6 ，(M 6 ＝M 4 -M 2 ) The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously record the time t when the coal sample starts to desorb after canning 2 Measuring the accumulated gas desorption quantity V of the coal sample in the coal sample tank at different accumulated time intervals t by using a gas desorption instrument, wherein the measuring time is 1-2 hours;
s5, calculating the loss of gas, and selectingV and +.A method is provided, according to the initial exposure of coal sample for a period of time>Is determined in a linear relation, namely:
wherein:
v-cumulative gas desorption in t time cm 3 ；
V Damage 1 Exposure time t 0 The loss of gas in cm 3 ；
K is a coefficient;
the exposure time before the determination of the desorption of the coal sample was (t) 0 ＝t 2 -t 1 ) The desorption time corresponding to the V value measured at different accumulation time intervals t is t 0 +t; to be used forDrawing the abscissa and the ordinate, determining each measuring point in a linear relation by the drawing, then obtaining the gas loss according to the least square method according to the coordinate value of the measuring point, and calculating the gas loss of coal per unit mass>
S6, calculating the gas loss amount of the coal sample, re-connecting the gas pressure measuring system into the experimental system formed in the step S1, and then calculating the gas loss amount V of the coal sample in the gas pressure measuring system Loss 2 (V Loss 2 ＝M 5 ×V′ Damage 1 ) And calculates the amount N of the substance of the gas loss amount from pv=nrt Damage to The method comprises the following steps:
wherein:
P well -downhole atmospheric pressure, MPa;
V loss 2 Exposure time t 0 The loss of gas in cm 3 ；
T-downhole temperature;
r is a constant, 8.314 is taken;
meanwhile, after the pressure representation number is stable, the pressure representation number P at the moment is recorded 3 And calculating the amount N of the substances of the free gas existing in the coal sample tank (11) according to PV=NRT At present The method comprises the following steps:
wherein:
P 3 -gauge (9) indication, MPa;
V 0 -free volume of the piping (including the coal sample tank (25)) between the control valve (8) and the control valve (12), cm 3 ；
V 3 Dead volume of coal, cm 3 ；
T-downhole temperature;
r is a constant, 8.314 is taken;
then, according to pv=nrt, the prediction sampling tank is filled with V Loss 2 After that, the indication P of the pressure gauge (9) 4 The method comprises the following steps:
wherein:
N at present -the amount, mol, of the substances present in the coal sample tank (11) of free gas;
N damage to -the amount of substance losing the amount of gas, mol;
t-downhole temperature;
r is a constant, 8.314 is taken;
V 0 -free volume of the piping (including the coal sample tank (25)) between the control valve (8) and the control valve (12), cm 3 ；
V 3 Dead volume of coal, cm 3 ；
S7, methane modulation based on the calibration tank volume V 4 According to P 1 V 1 /Z 1 ＝P 2 V 2 /Z 2 (Z 1 Is P 1 Compression coefficient of methane under the condition Z 2 Is P 2 Compression coefficient of methane under the condition), and calculating the gas pressure to be filled in the calibration tankThen opening the methane gas steel cylinder, adjusting the methane pressure reducing valve and leading the pressure in the buffer tank to reach the gas pressureP 5 Then closing the methane gas steel cylinder, and communicating the buffer tank with the detection tank, while the pressure sensor detects that the methane pressure is P 5 When the buffer tank is disconnected, the detection tank is connected with the detection tank;
s8, oiling operation, namely opening a advection pump, and oiling the detection tank through the advection pump, wherein the injection oil quantity value is (V) 0 -V 3 ) And the oil quantity value is injected into the detection tank to reach (V) 0 -V 3 ) Stopping oiling and closing the detection tank after the value is obtained;
s9, acquiring parameters, after finishing S8 operation and after stabilizing the pointer of the pressure gauge, reading the pressure value P in the detection tank at the moment 6 P is then 6 The gas pressure value of the coal bed is obtained.
The invention can restore the coal seam gas pressure by compensating the gas loss amount in the coal sample tank for measuring the gas pressure and measuring the coal seam gas pressure by utilizing the method of compensating the dead volume of a device which is incompressible and is not adsorbed by coal (such as silicone oil, organic oil, inorganic oil and the like), thereby restoring the coal seam storage environment in the measuring process, eliminating the influence of the dead volume of the device on the gas pressure measuring result, eliminating the influence of factors such as poor hole sealing effect, easy hole crossing and the like in underground measurement, accurately measuring the coal seam gas pressure, enabling staff to accurately judge the coal seam gas pressure value and playing a certain guiding significance for preventing and controlling coal and gas outburst.
It will be appreciated by those skilled in the art that the invention is not limited to the embodiments described above. The foregoing embodiments and description have been presented only to illustrate the principles of the invention. The present invention is capable of various changes and modifications without departing from its spirit and scope. Such variations and modifications are intended to fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A test method of a coal seam gas pressure test system based on drilling sampling actual measurement is characterized by comprising the following steps: the coal seam gas pressure testing system based on the drilling sampling actual measurement comprises a gas loss compensation device, a dead volume calibration device, a gas pressure measuring device, a dead volume filling device, a gas loss measuring device and a control system, wherein the gas pressure measuring device is respectively communicated with the gas loss compensation device, the dead volume calibration device, the dead volume filling device and the gas loss measuring device through a flow guide pipe, the control system is respectively 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, at least one of the gas pressure measuring devices and the gas loss measuring device form a working group, all working groups are connected in parallel, and the flow guide pipe is mutually communicated 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 through at least one control valve, and the control valve is electrically connected with the control system;
the gas loss amount compensation device comprises a methane bottle, a methane pressure reducing valve, a pressure sensor, buffer tanks, a control valve and a communication pipeline, wherein the methane bottle is communicated with the methane pressure reducing valve and is communicated with the communication pipeline through the methane pressure reducing valve, at least one buffer tank is of a closed cavity structure, each buffer tank is provided with two diversion ports, each diversion port is communicated with one communication pipeline through one control valve, at least one of the communication pipelines is communicated with the methane pressure reducing valve, at least one other communication pipeline is communicated with the control valve, and a plurality of pressure sensors are respectively positioned on each communication pipeline;
the dead volume calibration device comprises a helium bottle, a helium pressure reducing valve, a pressure sensor, calibration tanks, a control valve and a communication pipeline, wherein the helium bottle is communicated with the helium pressure reducing valve and is communicated with the communication pipeline through the helium pressure reducing valve, at least one of the calibration tanks is of a closed cavity structure, each calibration tank is provided with two diversion ports, each diversion 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, at least one other communication pipeline is communicated with the control valve, and a plurality of pressure sensors are respectively positioned on each communication pipeline;
at least one of the methane bottle and the helium bottle, and when the methane bottle and the helium bottle are two or more than two, the methane bottle and the helium bottle are communicated with each other through the collecting pipe respectively;
the gas pressure measuring device comprises a pressure gauge, a pressure sensor, a temperature sensor, a detection tank, a constant-temperature water bath mechanism, two-way connectors, a control valve and a communication pipeline, wherein the pressure gauge is connected with the two-way connectors and is mutually communicated with the detection tank through the two-way connectors, the detection tank is of a closed cavity structure, at least three diversion ports are arranged on the upper end face of the detection tank, one diversion port is communicated with the two-way connectors through the communication pipeline, the remaining two diversion 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 constant-temperature water bath mechanism is coated on the outer surface of the detection tank, the two-way connectors are additionally communicated with the control valve through the communication pipeline, and the pressure sensors are respectively positioned in the communication pipelines and the detection tank, and at least one of the temperature sensors is embedded in the detection tank and uniformly distributed around the axis of the detection tank;
the dead volume filling device comprises a advection pump, an oil cup, two-way valves and a communication pipeline, wherein the two-way valves are mutually communicated with the advection pump through the communication pipeline, the advection pump is mutually communicated with the oil cup through the communication pipeline, the two-way valves are mutually communicated with the control valve through the communication pipeline, and are mutually communicated with two-way joints of the gas pressure measuring device through the communication valve and the guide pipe;
the gas loss measuring device comprises a gas desorption instrument, a coal sample tank, a quick connector, a control valve and a communication pipeline, wherein the coal sample tank is provided with at least one control valve and is communicated with the control valve, the control valve is communicated with the quick connector through the communication pipeline, and the quick connector is communicated with the gas desorption instrument;
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 network communication module is arranged in the control system;
the test method of the coal seam gas pressure test system based on the drilling sampling actual measurement comprises the following steps:
s1, assembling equipment, namely firstly 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 experimental system;
s2, preliminary test, ensuring that each control valve of a gas loss compensation device, a dead volume calibration device, a gas pressure measurement device, a dead volume filling device and a gas loss measurement device is in a closed state before the test is started, then opening a helium gas steel cylinder control valve, adjusting a helium gas pressure reducing valve to ensure that the gas outlet pressure is not greater than the measuring range of a pressure sensor, flushing nitrogen into a calibration tank, and recording the pressure indication P at the moment in a control system after the indication displayed on a computer through the pressure sensor is stable 1 Then the control valve is opened again, nitrogen in the calibration tank is conveyed into the detection tank of the gas pressure measuring device, and after the accuracy pressure sensor displays that the pressure in the calibration tank and the pressure in the detection tank are stable, the pressure value P in the calibration tank at the moment is recorded 2 Then according to the calculation function:
P 1 V 1 /Z 1 ＝P 2 V 2 /Z 2 ；
wherein:
Z 1 is P 1 The compression coefficient of helium under conditions;
Z 2 is P 2 The compression coefficient of helium under conditions;
the volume V of free nitrogen in the pipeline between the detection tank and the calibration tank can be obtained 0 ＝V 2 —V 1 ；
After the calibration is finished, opening a control valve to release helium gas, and sealing the calibration tank and the detection tank again after the nitrogen release is finished;
s3, prefabricating equipment, detaching the gas pressure measuring device and the gas loss measuring device from the experiment, and then weighing the whole of the gas pressure measuring device and the gas loss measuring device:
wherein the mass M of the pipeline communicated between the control valve, the pressure gauge, the two-way detection tank and the components of the integral weighing gas pressure measuring device 1 ；
Mass M of pipeline for integrally weighing quick joint, control valve, coal sample tank and communication between components 2 ；
Then bringing the gas pressure measuring device and the gas loss measuring device into the well;
s4, sampling, namely constructing a drilling hole on the newly exposed coal wall of the mining working face by using a coal electric drill to perpendicularly drill the coal wall, starting sampling when drilling to a preset position, and recording sampling starting time t according to the coal seam gas content underground direct measurement method (AQ 1066-2008) of the safety production industry standard of the people' S republic of China 1 Dividing the collected fresh coal sample into two parts, respectively loading the two parts into a sampling tank and a coal sample tank, and integrally weighing the weight of the gas pressure measuring device and marking the weight as M 3 The gas loss amount measuring device was weighed as a whole and recorded as M 4 Then calculate the mass M of the coal sample in the sampling tank 5 ，(M 5 ＝M 3 -M 1 ) Mass M of coal sample loaded in coal sample tank 6 ，(M 6 ＝M 4 -M 2 ) The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously record the time t when the coal sample starts to desorb after canning 2 Measuring the accumulated gas desorption quantity V of the coal sample in the coal sample tank at different accumulated time intervals t by using a gas desorption instrument, wherein the measuring time is 1-2 hours;
s5, calculating the loss of gas, and selectingV and +.A method is provided, according to the initial exposure of coal sample for a period of time>(t 0 ＝t 2 -t 1 ) Is determined in a linear relation, namely:
wherein:
v-cumulative gas desorption in t time cm 3 ；
V Damage 1 Exposure time t 0 The loss of gas in cm 3 ；
K is a coefficient; '
The exposure time before the determination of the desorption of the coal sample was (t) 0 ＝t 2 -t 1 ) The desorption time corresponding to the V value measured at different accumulation time intervals t is t 0 +t; to be used forDrawing the abscissa and V as the ordinate, judging each measuring point in linear relation by the drawing, then obtaining the gas loss according to the coordinate value of the measuring point by a least square method, and calculating the gas loss V 'of coal with unit mass' Damage 1 />
S6, calculating the gas loss amount of the coal sample, re-connecting the gas pressure measuring system into the experimental system formed in the step S1, and then calculating the gas loss amount V of the coal sample in the gas pressure measuring system Loss 2 (V Loss 2 ＝M 5 ×V′ Damage 1 ) And calculates the amount N of the substance of the gas loss amount from pv=nrt Damage to The method comprises the following steps:
wherein:
P and is combined with -downhole atmospheric pressure, MPa;
V loss 2 Exposure time t 0 The loss of gas in cm 3 ；
T-downhole temperature
R is a constant, 8.314 is taken;
meanwhile, after the pressure representation number is stable, the pressure representation number P at the moment is recorded 3 And calculating the amount N of the substances of the free gas existing in the coal sample tank (11) according to PV=NRT At present The method comprises the following steps:
wherein:
P 3 -gauge (9) indication, MPa;
V 0 -the free volume of the piping (including the coal sample tank (25)) between the control valve (8) and the control valve (12), cm3;
V 3 dead volume of coal, cm 3 ；
T-downhole temperature, K
R is a constant, 8.314 is taken;
then, according to pv=nrt, the prediction sampling tank is filled with V Loss 2 After that, the indication P of the pressure gauge (9) 4 The method comprises the following steps:
wherein:
N at present -the amount, mol, of the substances present in the coal sample tank (11) of free gas;
N damage to -the amount of substance losing the amount of gas, mol;
t-downhole temperature, K
R is a constant, 8.314 is taken;
V 0 -the free volume of the piping (including the coal sample tank (25)) between the control valve (8) and the control valve (12), cm3;
V 3 dead volume of coal, cm 3 ；
S7, prefabricating methane based on the volume V of the calibration tank 4 According to P 1 V 1 /Z 1 ＝P 2 V 2 /Z 2 (Z 1 Is P 1 Compression coefficient of methane under the condition Z 2 Is P 2 Compression coefficient of methane under the condition), and calculating the gas pressure P to be filled in the calibration tank 5 Then opening the methane gas steel cylinder, regulating the methane pressure reducing valve and leading the pressure in the buffer tank to reach the gas pressure P 5 Then closing the methane gas steel cylinder, and communicating the buffer tank with the detection tank, while the pressure sensor detects that the methane pressure is P 5 When the buffer tank is disconnected, the detection tank is connected with the detection tank;
s8, oiling, namely opening a advection pump, and oiling the detection tank through the advection pump, wherein the injection oil quantity value is (V) 0 -V 3 ) And the oil quantity value is injected into the detection tank to reach (V) 0 -V 3 ) Stopping oiling and closing the detection tank after the value is obtained;
s9, reading a final value; after the S8 operation is completed, and after the pointer of the pressure gauge is stable, the pressure value P in the detection tank is read 6 P is then 6 The gas pressure value of the coal bed is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910461321.4A CN110108850B (en) | 2019-05-30 | 2019-05-30 | Coal seam gas pressure testing system and method based on drilling sampling actual measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910461321.4A CN110108850B (en) | 2019-05-30 | 2019-05-30 | Coal seam gas pressure testing system and method based on drilling sampling actual measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110108850A CN110108850A (en) | 2019-08-09 |
| CN110108850B true CN110108850B (en) | 2024-02-20 |
Family
ID=67492882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910461321.4A Active CN110108850B (en) | 2019-05-30 | 2019-05-30 | Coal seam gas pressure testing system and method based on drilling sampling actual measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110108850B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112324487B (en) * | 2020-10-20 | 2022-08-26 | 中煤科工集团重庆研究院有限公司 | Double-index evaluation method for outburst prevention effect of coal roadway strip |
| CN112730606B (en) * | 2020-12-31 | 2022-09-27 | 青岛精安医疗科技有限责任公司 | Ultrasonic oxygen concentration measuring method and system based on pressure detection and oxygen generation system |
| CN113310631B (en) * | 2021-05-31 | 2023-10-27 | 贵州省矿山安全科学研究院有限公司 | Method for rapidly determining gas content in coal seam and portable device |
| CN113899654A (en) * | 2021-10-11 | 2022-01-07 | 重庆大学 | Experiment system and experiment method for measuring coal sample gas loss amount |
| CN114965150B (en) * | 2022-04-14 | 2024-04-16 | 安徽理工大学 | Method for testing coal seam water injection gas and dust control effect in linkage mode |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107703023A (en) * | 2017-09-30 | 2018-02-16 | 河南理工大学 | A kind of surface drilling coal core modeled pressure drop desorption apparatus and test device and method |
| CN108181224A (en) * | 2018-01-05 | 2018-06-19 | 中国石油大学(华东) | Displacement and capillary pressure curve translocation device and method is sucked under reservoir condition |
| CN109187266A (en) * | 2018-09-14 | 2019-01-11 | 中煤科工集团重庆研究院有限公司 | Gas bearing capacity direct measuring method gas loss amount compensation model experimental system and method |
| CN210347634U (en) * | 2019-05-30 | 2020-04-17 | 河南理工大学 | Coal seam gas pressure test system based on drilling sampling actual measurement |
-
2019
- 2019-05-30 CN CN201910461321.4A patent/CN110108850B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107703023A (en) * | 2017-09-30 | 2018-02-16 | 河南理工大学 | A kind of surface drilling coal core modeled pressure drop desorption apparatus and test device and method |
| CN108181224A (en) * | 2018-01-05 | 2018-06-19 | 中国石油大学(华东) | Displacement and capillary pressure curve translocation device and method is sucked under reservoir condition |
| CN109187266A (en) * | 2018-09-14 | 2019-01-11 | 中煤科工集团重庆研究院有限公司 | Gas bearing capacity direct measuring method gas loss amount compensation model experimental system and method |
| CN210347634U (en) * | 2019-05-30 | 2020-04-17 | 河南理工大学 | Coal seam gas pressure test system based on drilling sampling actual measurement |
Non-Patent Citations (1)
| Title |
|---|
| 水分自然侵入促进含瓦斯煤解吸效应实验研究;陈金生等;《中国安全生产科学技术》;第第12卷卷(第第4期期);第76-80页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110108850A (en) | 2019-08-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110108850B (en) | Coal seam gas pressure testing system and method based on drilling sampling actual measurement | |
| WO2020133729A1 (en) | Method and system for in-situ test of mechanical behaviors and seepage characteristics of coal rock mass under influence of real mining induced stress | |
| CN103033442B (en) | A kind of gas adsorption test device for desorption | |
| US20210190666A1 (en) | Device and method for measuring horizontal/vertical permeability of hydrate reservoir | |
| CN106970001A (en) | The simulating test device and method of loss tolerance in the test of shale air content | |
| CN109211755A (en) | The permeability test device of coal body containing Gas Hydrate and method | |
| CN106932328B (en) | System and method for testing coal permeability by using trace gas | |
| CN110749434A (en) | System and method for testing pressure maintaining characteristic of pressure maintaining cabin of coring device | |
| CN108952678B (en) | Heterogeneous coal-bearing rock reservoir gas production contribution rate simulation test device and test method | |
| CN108104796A (en) | Has channeling simulating test device and test method | |
| CN111855527A (en) | Damaged concrete gas permeability detection device and method | |
| CN108169462A (en) | Has channeling simulation system | |
| CN210347634U (en) | Coal seam gas pressure test system based on drilling sampling actual measurement | |
| CN113790853A (en) | Comprehensive test platform for dynamic sealing performance of gas storage cap rock | |
| CN206832613U (en) | The simulating test device of tolerance is lost in the test of shale air content | |
| CN110927359B (en) | Experimental test device and method for gas loss content in low-permeability porous medium coring process | |
| CN208043584U (en) | A kind of coal petrography gas adsorption desorption simulation test device | |
| CN114263457B (en) | Coalbed methane well gas production simulation platform and yield analysis and prediction method | |
| RU2766992C1 (en) | Installation for testing with respect to deformation of metal casing pipe in process of waiting for hardening of cement mortar for well cementing | |
| CN112211599A (en) | Device and method for simulating drilling fluid to invade reservoir stratum to induce hydrate decomposition | |
| CN113700472B (en) | Method for determining air leakage direction and measuring air leakage amount of goaf | |
| CN115435983A (en) | External pressure type sealing performance test device | |
| CN108106970B (en) | Visual heat resisting and pressure resisting device, gas-liquid interface mass transfer dissolution measuring device and method | |
| CN210714627U (en) | Device for simulating drilling fluid to invade reservoir stratum to induce hydrate decomposition | |
| RU2298774C1 (en) | Method for controlling reservoir sealing tightness |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |