CN110108850A - A kind of coal-bed gas pressure test macro and method based on drilling sampling actual measurement - Google Patents

A kind of coal-bed gas pressure test macro and method based on drilling sampling actual measurement Download PDF

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Publication number
CN110108850A
CN110108850A CN201910461321.4A CN201910461321A CN110108850A CN 110108850 A CN110108850 A CN 110108850A CN 201910461321 A CN201910461321 A CN 201910461321A CN 110108850 A CN110108850 A CN 110108850A
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tank
gas
coal
pressure
loss amount
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CN110108850B (en
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王兆丰
魏世义
陈金生
俞宏庆
董家昕
郑立军
岳基伟
李学臣
郑梦浩
李艳飞
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Jiaozuo Coal Industry Group Co ltd
Henan University of Technology
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Jiaozuo Coal Industry Group Co ltd
Henan University of Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00Measuring 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/22Fuels; Explosives
    • G01N33/222Solid fuels, e.g. coal

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  • 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)
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  • General Health & Medical Sciences (AREA)
  • Food Science & Technology (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The present invention relates to a kind of coal-bed gas pressure test macros based on drilling sampling actual measurement, including gas loss amount compensation device, dead volume caliberating device, gas pressure measurement device, dead volume filling device, gas loss amount determining device and control system, wherein gas pressure measurement device is interconnected with gas loss amount compensation device, dead volume caliberating device, dead volume filling device, gas loss amount determining device respectively by diversion pipe;Its test method includes equipment assembling, and preliminary test, equipment is prefabricated, and sampling calculates gas loss amount, calculates coal sample gas loss amount, and methane is prefabricated, nine steps such as oiling and reading end value.The present invention can make that coal seam storage ambient can be restored in continuous mode, influence of the remover dead volume to gas pressure measurement result, and sealing of hole effect is poor in exclusion underground survey, easily the influence of the factors such as string hole, can accurately measure coal-bed gas pressure.

Description

A kind of coal-bed gas pressure test macro and method based on drilling sampling actual measurement
Technical field
The present invention relates to a kind of coal-bed gas pressure measuring technologies and equipment based on drilling sampling actual measurement, belong to coal mine peace Full technical field.
Background technique
Coal and gas prominent is closely related with coal-bed gas pressure, and coal and gas prominent not only can seriously destroy the life of underground Facility is produced, huge economic loss is caused to country and enterprise, the gas density in underground air is also will cause and increases rapidly simultaneously Cause gas explosion accident, seriously threatens the personal safety of coal miner." prevention and treatment coal and gas prominent regulation " requires: newly-built Mine in feasibility study stage, should to all average thickness that mining operation in mine may disclose 0.3m or more coal Layer carries out outburst hazard assessment;There are the coal mining enterprise of projecting mine, projecting mine should be according to the actual state of projecting mine And condition, formulate regional complex outburst prevention measures and local comprehensive outburst control measure.Gas pressure is that Coal Seam Outburst Hazard is assessed, is pre- The index that survey and region extinction measure effect are examined." prevention and treatment coal and gas prominent regulation " is required to meet one of the following conditions Coal seam should be used as projecting coal bed processing, i.e. gas bearing capacity >=8m3/ t or gas pressure >=0.74MPa.But in the actual environment, It is small in the presence of surveyed coal-bed gas pressure, but the situation that gas bearing capacity is big, since down-hole drilling coal-bed gas pressure is surveyed Place is tried, the influence of sealing quality causes the error of test big, and success rate is low.It is arranged carrying out pre- coal-bed gas region protrusion-dispelling of taking out When applying validity check, the extraction borehole arranged be easy to pressure tap string hole, cause measured residual gas pressure value to be less than Actual value makes underground operators be unable to judge accurately coal seam pressure, causes coal and gas prominent accident.
It therefore, is Accurate Determining coal seam (remaining) gas pressure, it is necessary to establish a kind of coal based on drilling sampling actual measurement Layer gas pressure measuring technology and equipment take well sampling measurement coal sample loss gas amount and experimental determination gas pressure The method combined, exclude underground survey in sealing of hole effect it is poor, easily go here and there hole influence, can effectively measure coal seam (remaining) watt This pressure, makes whether staff's accurate judgement coal seam has outburst danger, plays certain guidance to the safety in production of mine Meaning.
Summary of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of coal-bed gas pressure based on drilling sampling actual measurement Test macro and method.
To achieve the goals above, the present invention is to realize by the following technical solutions:
A kind of coal-bed gas pressure test macro based on drilling sampling actual measurement, including it is gas loss amount compensation device, dead Volume calibration device, gas pressure measurement device, dead volume filling device, gas loss amount determining device and control system, Middle gas pressure measurement device is filled out with gas loss amount compensation device, dead volume caliberating device, dead volume respectively by diversion pipe Fill set, gas loss amount determining device be interconnected, control system respectively with gas loss amount compensation device, dead volume demarcate Device, gas pressure measurement device, dead volume filling device, gas loss amount determining device are electrically connected, wherein gas pressure Measurement device at least one, and gas pressure measurement device and gas loss amount determining device constitute a working group, respectively It is parallel with one another between working group, diversion pipe and gas loss amount compensation device, dead volume caliberating device, gas pressure measurement device, Dead volume filling device, gas loss amount determining device pass through at least one control valve be interconnected, and the control valve with Control system electrical connection.
Further, the gas loss amount compensation device includes methane bottle, methane pressure reducer valve, pressure sensor, delays Rush tank, control valve and connecting pipeline, wherein the methane bottle is connected to methane pressure reducer valve, and by methane pressure reducer valve be connected to Pipeline connection, the buffer tank at least one, each buffer tank is airtight cavity structure, and each buffer tank is all provided with two water conservancy diversion Mouthful, and each flow-guiding mouth passes through a control valve and a connecting pipeline is interconnected, in the connecting pipeline, wherein at least One is interconnected with methane pressure reducer valve, and another at least one connecting pipeline and control valve are interconnected, if the pressure sensor It is dry, it is located on each connecting pipeline.
Further, the dead volume caliberating device include helium tank, helium pressure reducing valve, pressure sensor, tank prover, Control valve and connecting pipeline wherein the helium tank is connected to helium pressure reducing valve, and pass through helium pressure reducing valve and connecting pipeline Connection, the tank prover at least one, each tank prover is airtight cavity structure, and each tank prover is all provided with two flow-guiding mouths, And each flow-guiding mouth passes through a control valve and a connecting pipeline is interconnected, and in the connecting pipeline, wherein at least one Item and helium pressure reducing valve are interconnected, and another at least one connecting pipeline and control valve are interconnected, and the pressure sensor is several, It is located on each connecting pipeline.
Further, it is characterised in that: the methane bottle, helium tank at least one, and when methane bottle, helium tank are equal When for two and more than two, it is interconnected respectively by collecting pipe between each methane bottle and each helium tank.
Further, the gas pressure measurement device includes pressure gauge, pressure sensor, temperature sensor, detection Tank, water bath with thermostatic control mechanism, two-way joint, control valve and connecting pipeline, pressure gauge are connected with two-way joint, and connect by two Head is interconnected with detection tank, and the detection tank is airtight cavity structure, and end face sets at least three flow-guiding mouths thereon, one of them Flow-guiding mouth is connected to by connecting pipeline with two-way joint, and remaining two flow-guiding mouths are mutually interconnected with control valve respectively by connecting pipeline It is logical, and be interconnected respectively with gas loss amount compensation device, dead volume caliberating device by control valve, the water bath with thermostatic control machine Structure is coated on detection tank outer surface, and the two-way joint separately passes through connecting pipeline and control valve is interconnected, the pressure sensing Device is several, be located at each connecting pipeline and detection tank in, the temperature sensor at least one, embedded in detection tank in and surround It is uniformly distributed to detect tank axis.
Further, the dead volume filling device includes constant-flux pump, lubricating cup, two-way valve and connecting pipeline, wherein The two-way valve is interconnected by connecting pipeline and constant-flux pump, and the constant-flux pump is interconnected by connecting pipeline and lubricating cup, The two-way valve separately passes through connecting pipeline and control valve is interconnected, and is filled by communicating valve and diversion pipe and gas pressure measurement The two-way joint set is interconnected.
Further, the gas loss amount determining device includes desorption of mash gas instrument, coal sample tank, quick coupling, control Valve and connecting pipeline set at least one control valve on the coal sample tank and are interconnected with control valve, and the control valve passes through Connecting pipeline and quick coupling are interconnected, and the quick coupling and desorption of mash gas instrument are interconnected.
Further, the control system is total based on any one in industrial computer, personal computer or two kinds Circuit system based on, and the control system it is another at least one set network communication module.
A kind of test method of the coal-bed gas pressure test macro based on drilling sampling actual measurement, comprising the following steps:
S1, equipment assembling, first to gas loss amount compensation device, dead volume caliberating device, gas pressure measurement device, Dead volume filling device, gas loss amount determining device and control system carry out assembly and connection, constitute complete experimental system;
S2, initial setting up, experiment guarantee gas loss amount compensation device, dead volume caliberating device, gas pressure before starting Measurement device, dead volume filling device, each control valve of gas loss amount determining device are in close state, and then open helium Gas bomb control valve adjusts the range that helium pressure reducing valve makes outlet pressure be not more than pressure sensor, and into tank prover It pours nitrogen, and after stablizing by the registration that pressure sensor is shown on computers, records pressure at this time in the controls Registration P1, it is then again turned on control valve, nitrogen in tank prover is delivered in the detection tank of gas pressure measurement device, and After accuracy pressure sensor shows that tank prover and detection pressure inside the tank are stablized, pressure value P in tank prover at this time is recorded2, then root According to calculating function:
P1V1/Z1=P2V2/Z2
Wherein:
Z1For P1Under the conditions of helium the compressed coefficient;
Z2For P2Under the conditions of helium the compressed coefficient;
It can obtain the nomadic nitrogen air volume V between detection tank and tank prover in pipeline0=V2—V1
And after to be calibrated, open control valve and release helium atmosphere, is again sealed off calibration after completing nitrogen release Tank and detection tank;
S3, sampling is prefabricated, by gas pressure measurement device and gas loss amount determining device under the lower ibid disassembly of experiment Come, whole weighing then carried out to gas pressure measurement device and gas loss amount determining device:
Wherein connect between the whole control valve for weighing gas pressure measurement device, pressure gauge, two logical, detection tanks and component The mass M of logical pipeline1
The whole mass M for weighing the pipeline being connected between quick coupling, control valve, coal sample tank and component2
Then gas pressure measurement device is brought into underground together with gas loss amount determining device.
S4, sampling, according to safety in production professional standard " the coal seam gas-bearing capacity underground directly side of measurement, the People's Republic of China (PRC) Method (AQ1066-2008) ", on newly exposed getting working face coal wall, is constructed one and drilled with the vertical coal wall of electric coal drill, drilling Start to sample when to predetermined position, and records sample start times t1, the fresh coal sample of acquisition is divided into two parts and is respectively charged into It is whole to weigh gas pressure measurement installation weight and be denoted as M in sample can and coal sample tank3, it is fixed that whole weighing gas loss measures Installation weight is simultaneously recorded as M4, the mass M of be packed into coal sample in sample can is then calculated5, (M5=M3-M1), in coal sample tank The mass M of be packed into coal sample6, (M6=M4-M2);Time t when starting desorption after coal sample tinning is recorded simultaneously2, use desorption of mash gas The coal sample that instrument measures the coal sample tank under different accumulation periods t adds up desorption of mash gas amount V, wherein 1-2 hour of minute;
S5 calculates gas loss amount, choosesMethod, according to coal sample start expose a period of time in V withDetermination in linear relation, it may be assumed that
In formula:
V --- the accumulation desorption of mash gas amount in the t time, cm3
VDamage 1--- exposure duration t0Interior gas loss amount, cm3
K --- coefficient;
Coal sample desorption measurement before exposure duration beThe V value measured under different accumulation periods t Corresponding desorption time is t0+t;WithFor abscissa, V is that ordinate is drawn, and is determined by figure in a linear relationship each Measuring point finds out gas loss amount by least square method then according to the coordinate value of measuring point, and the coal of unit mass is calculated Gas loss amount
S6 calculates coal sample gas loss amount, and gas pressure measurement system is accessed to the experiment system of S1 step composition again In system, coal sample gas loss amount V in gas pressure measurement system is then calculatedDamage 2(VDamage 2=M5×V′Damage 1), and according to PV=NRT, Calculate the amount N of the substance of gas loss amountDamage, it may be assumed that
In formula:
PWell--- underground atmospheric pressure, MPa;
VDamage 2--- exposure duration t0Interior gas loss amount, cm3
T --- downhole temperature;
R --- constant takes 8.314;
Meanwhile pressure gauge registration P at this time is recorded after pressure gauge registration is stablized3, and according to PV=NRT, calculate coal sample The amount N of the substance of existing free gas in tank (11)It is existing, it may be assumed that
In formula:
P3--- pressure gauge (9) registration, MPa;
V0--- the free volume of pipeline (including coal sample tank (25)), cm between control valve (8) and control valve (12)3
V3--- the dead volume of coal, cm3
T --- downhole temperature;
R --- constant takes 8.314;
Then, according to PV=NRT, prediction samples tank is filled with VDamage 2Afterwards, the registration P of pressure gauge (9)4, it may be assumed that
In formula:
NIt is existing--- the amount of the substance of existing free gas, mol in coal sample tank (11);
NDamage--- the amount of the substance of loss gas amount, mol;
T --- downhole temperature;
R --- constant takes 8.314;
V0--- the free volume of pipeline (including coal sample tank (25)) between control valve (8) and control valve (12)), cm3
V3--- the dead volume of coal, cm3
S7, methane modulation, based on calibration tank volume V4, according to P1V1/Z1=P2V2/Z2(Z1For P1Under the conditions of methane compression Coefficient, Z2For P2Under the conditions of methane the compressed coefficient), calculate the gas pressure that should be filled in tank proverThen methane gas steel cylinder is opened, methane pressure reducer valve is adjusted and makes to be punched into buffering Pressure inside the tank reaches gas pressure P5, it is then shut off methane gas steel cylinder, and be connected to surge tank with detection tank, while to pressure Sensor detects that pressure of methane is P5When, it closes disconnection surge tank and is connected with detection tank;
Constant-flux pump is opened in S8, oiling operation, by constant-flux pump oiling into detection tank, wherein injection oil mass value is (V0- V3), and injection oil mass value reaches (V in detection tank0-V3) stop oiling after value and close detection tank;
S9 gets parms, and after completing S8 operation, and after gauge hand is stablized, reads the pressure detected in tank at this time Value P6, then P6As coal-bed gas pressure value.
The present invention by measurement gas pressure coal sample tank in compensate gas loss amount and using have Incoercibility, Coal is not measured by the method for the fluent material of coal body adsorptivity (such as: silicone oil, organic oil, inorganic oil etc.) compensation device dead volume Layer gas pressure, makes that coal seam storage ambient can be restored in continuous mode, remover dead volume is to gas pressure measurement result Influence, exclude that sealing of hole effect in underground survey is poor, easily go here and there the influences of the factors such as hole, can accurately measure coal-bed gas pressure Power makes staff's accurate judgement coal-bed gas pressure value, plays certain directive significance to prevention and treatment coal and gas prominent.
Detailed description of the invention
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is schematic structural view of the invention;
Fig. 2 is experimental method flow chart of the present invention;
Fig. 3 is experimental data statistical chart of the present invention.
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to Specific embodiment, the present invention is further explained.
A kind of coal-bed gas pressure test macro based on drilling sampling actual measurement as described in Figure 1, including gas loss amount are mended Repay device 1, dead volume caliberating device 2, gas pressure measurement device 3, dead volume filling device 4, gas loss amount determining device 5 And control system 6, wherein gas pressure measurement device 3 by diversion pipe 7 respectively with gas loss amount compensation device 1, dead volume Caliberating device 2, dead volume filling device 4, gas loss amount determining device 5 be interconnected, control system 6 respectively with gas loss It measures compensation device 1, dead volume caliberating device 2, gas pressure measurement device 3, dead volume filling device 4, gas loss and measures and determine Device 5 is electrically connected, wherein gas pressure measurement device 3 at least one, and gas pressure measurement device 3 and a gas loss Amount determining device 1 constitutes a working group, parallel with one another between each working group, diversion pipe 7 and gas loss amount compensation device 1, dead Volume calibration device 2, gas pressure measurement device 3, dead volume filling device 4, gas loss amount determining device 5 are by least One control valve 8 is interconnected, and the control valve 8 and control system 6 are electrically connected.
Wherein, the gas loss amount compensation device 1 include methane bottle 11, methane pressure reducer valve 12, pressure sensor 13, Surge tank 14, control valve 8 and connecting pipeline 16 wherein the methane bottle 11 is connected to methane pressure reducer valve 12, and pass through methane Pressure reducing valve 12 is connected to connecting pipeline 16, the buffer tank 14 at least one, each buffer tank 14 is airtight cavity structure, and every A buffer tank 14 is all provided with two flow-guiding mouths, and each flow-guiding mouth passes through a control valve 8 and interconnects with 16 phase of connecting pipeline Logical, in the connecting pipeline 16, wherein at least one and methane pressure reducer valve 12 are interconnected, another at least one connecting pipeline 16 with Control valve 8 is interconnected, and the pressure sensor 13 is several, is located on each connecting pipeline 16.
Meanwhile the dead volume caliberating device 2 includes helium tank 21, helium pressure reducing valve 22, pressure sensor 13, calibration Tank 23, control valve 8 and connecting pipeline 16 wherein the helium tank 21 is connected to helium pressure reducing valve 22, and are depressurized by helium Valve 22 is connected to connecting pipeline 16, the tank prover 23 at least one, each tank prover 23 is airtight cavity structure, and each mark Determine tank 23 and be all provided with two flow-guiding mouths, and each flow-guiding mouth passes through a control valve 8 and a connecting pipeline 16 is interconnected, institute It states in connecting pipeline 16, wherein at least one and helium pressure reducing valve 22 are interconnected, another at least one connecting pipeline 16 and control Valve 8 is interconnected, and the pressure sensor 13 is several, is located on each connecting pipeline 16.
Advanced optimize, it is characterised in that: the methane bottle 11, helium tank 12 it is equal at least one, and work as methane bottle 11, it when helium tank 12 is two and is more than two, is mutually interconnected by collecting pipe respectively between each methane bottle 11 and each helium tank 12 It is logical.
In addition, the gas pressure measurement device 3 includes pressure gauge 31, pressure sensor 13, temperature sensor 32, inspection Survey tank 33, water bath with thermostatic control mechanism 34, two-way joint 35, control valve 8 and connecting pipeline 16, pressure gauge 31 and 35 phase of two-way joint Even, and by two-way joint 35 and detection tank 33 be interconnected, the detection tank 33 be airtight cavity structure, thereon end face set to Few three flow-guiding mouths, one of flow-guiding mouth are connected to by connecting pipeline 16 with two-way joint 35, and remaining two flow-guiding mouths pass through Connecting pipeline 16 respectively with control valve 8 be interconnected, and by control valve 8 respectively with gas loss amount compensation device 1, dead volume Caliberating device 2 is interconnected, and the water bath with thermostatic control mechanism 34 is coated on detection 33 outer surface of tank, and the two-way joint 35 separately passes through Connecting pipeline 16 and control valve 8 are interconnected, and the pressure sensor 13 is several, are located at each connecting pipeline 16 and detection tank In 33, the temperature sensor 32 at least one, it is in detection tank 32 and uniformly distributed around detection 33 axis of tank.
In the present embodiment, the dead volume filling device 4 includes constant-flux pump 41, lubricating cup 42, two-way valve 35 and connection Pipeline 16, wherein the two-way valve 35 is interconnected by connecting pipeline 16 and constant-flux pump 41, the constant-flux pump 41 passes through connection Pipeline 16 and lubricating cup 42 are interconnected, and the two-way valve 35 is separately interconnected by connecting pipeline 16 and control valve 8, and passes through company Port valve 8 and the two-way joint 35 of diversion pipe 7 and gas pressure measurement device 3 are interconnected.
It advanced optimizes, oil plant is inhaled for compressibilities such as silicone oil, organic oil, inorganic oils, not by coal body in the lubricating cup Any one in attached property oil plant.
In the present embodiment, the gas loss amount determining device 5 includes desorption of mash gas instrument 51, coal sample tank 52, fast quick access First 53, control valve 8 and connecting pipeline 16 set at least one control valve 8 on the coal sample tank 52 and interconnect with 8 phase of control valve Logical, the control valve 8 is interconnected by connecting pipeline 16 and quick coupling 53, and the quick coupling 53 and desorption of mash gas instrument 51 are interconnected.
In the present embodiment, the control system 6 is based on any one in industrial computer, personal computer or two kinds Circuit system based on sharing, and the control system it is another at least one set network communication module.
As shown in Figures 2 and 3, a kind of test method of the coal-bed gas pressure test macro based on drilling sampling actual measurement, packet Include following steps:
S1, equipment assembling, first to gas loss amount compensation device, dead volume caliberating device, gas pressure measurement device, Dead volume filling device, gas loss amount determining device and control system carry out assembly and connection, constitute complete experimental system;
S2, initial setting up, experiment guarantee gas loss amount compensation device, dead volume caliberating device, gas pressure before starting Measurement device, dead volume filling device, each control valve of gas loss amount determining device are in close state, and then open helium Gas bomb control valve adjusts the range that helium pressure reducing valve makes outlet pressure be not more than pressure sensor, and into tank prover It pours nitrogen, and after stablizing by the registration that pressure sensor is shown on computers, records pressure at this time in the controls Registration P1, it is then again turned on control valve, nitrogen in tank prover is delivered in the detection tank of gas pressure measurement device, and After accuracy pressure sensor shows that tank prover and detection pressure inside the tank are stablized, pressure value P in tank prover at this time is recorded2, then root According to calculating function:
P1V1/Z1=P2V2/Z2
Wherein:
Z1For P1Under the conditions of helium the compressed coefficient;
Z2For P2Under the conditions of helium the compressed coefficient;
It can obtain the nomadic nitrogen air volume V between detection tank and tank prover in pipeline0=V2—V1
And after to be calibrated, open control valve and release helium atmosphere, is again sealed off calibration after completing nitrogen release Tank and detection tank;
S3, sampling is prefabricated, by gas pressure measurement device and gas loss amount determining device under the lower ibid disassembly of experiment Come, whole weighing then is carried out to gas pressure measurement device and gas loss amount determining device;
Wherein connect between the whole control valve for weighing gas pressure measurement device, pressure gauge, two logical, detection tanks and component The mass M of logical pipeline1
The whole mass M for weighing the pipeline being connected between quick coupling, control valve, coal sample tank and component2
Then gas pressure measurement device is brought into underground together with gas loss amount determining device.
S4, sampling, according to safety in production professional standard " the coal seam gas-bearing capacity underground directly side of measurement, the People's Republic of China (PRC) Method (AQ1066-2008) ", on newly exposed getting working face coal wall, is constructed one and drilled with the vertical coal wall of electric coal drill, drilling Start to sample when to predetermined position, and records sample start times t1, the fresh coal sample of acquisition is divided into two parts and is respectively charged into It is whole to weigh gas pressure measurement installation weight and be denoted as M in sample can and coal sample tank3, it is fixed that whole weighing gas loss measures Installation weight is simultaneously recorded as M4, the mass M of be packed into coal sample in sample can is then calculated5, (M5=M3-M1), in coal sample tank The mass M of be packed into coal sample6, (M6=M4-M2);Time t when starting desorption after coal sample tinning is recorded simultaneously2, use desorption of mash gas The coal sample that instrument measures the coal sample tank under different accumulation periods t adds up desorption of mash gas amount V, wherein 1-2 hour of minute;
S5 calculates gas loss amount, choosesMethod, according to coal sample start expose a period of time in V withDetermination in linear relation, it may be assumed that
In formula:
V --- the accumulation desorption of mash gas amount in the t time, cm3
VDamage 1--- exposure duration t0Interior gas loss amount, cm3
K --- coefficient;
Exposure duration before coal sample desorption measurement is (t0=t2-t1), the V value institute measured under different accumulation periods t is right The desorption time answered is t0+t;WithFor abscissa, V is ordinate drawing, and each survey in a linear relationship is determined by figure Point finds out gas loss amount by least square method, and watt of the coal of unit mass is calculated then according to the coordinate value of measuring point This loss amount
S6 calculates coal sample gas loss amount, and gas pressure measurement system is accessed to the experiment system of S1 step composition again In system, coal sample gas loss amount V in gas pressure measurement system is then calculatedDamage 2(VDamage 2=M5×V′Damage 1), and according to PV=NRT, Calculate the amount N of the substance of gas loss amountDamage, it may be assumed that
In formula:
PWell--- underground atmospheric pressure, MPa;
VDamage 2--- exposure duration t0Interior gas loss amount, cm3
T --- downhole temperature;
R --- constant takes 8.314;
Meanwhile pressure gauge registration P at this time is recorded after pressure gauge registration is stablized3, and according to PV=NRT, calculate coal sample The amount N of the substance of existing free gas in tank (11)It is existing, it may be assumed that
In formula:
P3--- pressure gauge (9) registration, MPa;
V0--- the free volume of pipeline (including coal sample tank (25)), cm between control valve (8) and control valve (12)3
V3--- the dead volume of coal, cm3
T --- downhole temperature;
R --- constant takes 8.314;
Then, according to PV=NRT, prediction samples tank is filled with VDamage 2Afterwards, the registration P of pressure gauge (9)4, it may be assumed that
In formula:
NIt is existing--- the amount of the substance of existing free gas, mol in coal sample tank (11);
NDamage--- the amount of the substance of loss gas amount, mol;
T --- downhole temperature;
R --- constant takes 8.314;
V0--- the free volume of pipeline (including coal sample tank (25)) between control valve (8) and control valve (12)), cm3
V3--- the dead volume of coal, cm3
S7, methane modulation, based on calibration tank volume V4, according to P1V1/Z1=P2V2/Z2(Z1For P1Under the conditions of methane compression Coefficient, Z2For P2Under the conditions of methane the compressed coefficient), calculate the gas pressure that should be filled in tank proverThen methane gas steel cylinder is opened, methane pressure reducer valve is adjusted and makes to be punched into buffering Pressure inside the tank reaches gas pressure P5, it is then shut off methane gas steel cylinder, and be connected to surge tank with detection tank, while to pressure Sensor detects that pressure of methane is P5When, it closes disconnection surge tank and is connected with detection tank;
Constant-flux pump is opened in S8, oiling operation, by constant-flux pump oiling into detection tank, wherein injection oil mass value is (V0- V3), and injection oil mass value reaches (V in detection tank0-V3) stop oiling after value and close detection tank;
S9 gets parms, and after completing S8 operation, and after gauge hand is stablized, reads the pressure detected in tank at this time Value P6, then P6As coal-bed gas pressure value.
The present invention by measurement gas pressure coal sample tank in compensate gas loss amount and using have Incoercibility, Coal is not measured by the method for the fluent material of coal body adsorptivity (such as: silicone oil, organic oil, inorganic oil etc.) compensation device dead volume Layer gas pressure, makes that coal seam storage ambient can be restored in continuous mode, remover dead volume is to gas pressure measurement result Influence, exclude that sealing of hole effect in underground survey is poor, easily go here and there the influences of the factors such as hole, can accurately measure coal-bed gas pressure Power makes staff's accurate judgement coal-bed gas pressure value, plays certain directive significance to prevention and treatment coal and gas prominent.
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments.Above-described embodiment and explanation It is merely illustrated the principles of the invention described in book.Without departing from the spirit and scope of the present invention, the present invention also has Various changes and modifications.These changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention It is defined by the appending claims and its equivalent thereof.

Claims (9)

1. a kind of coal-bed gas pressure test macro based on drilling sampling actual measurement, it is characterised in that: described to be adopted based on drilling The coal-bed gas pressure test macro of sample actual measurement includes gas loss amount compensation device, dead volume caliberating device, gas pressure survey Device, dead volume filling device, gas loss amount determining device and control system are determined, wherein the gas pressure measurement device is logical It crosses diversion pipe and is measured respectively with gas loss amount compensation device, dead volume caliberating device, dead volume filling device, gas loss and determined Device be interconnected, the control system respectively with gas loss amount compensation device, dead volume caliberating device, gas pressure measurement Device, dead volume filling device, the electrical connection of gas loss amount determining device, wherein the gas pressure measurement device at least one It is a, and gas pressure measurement device and gas loss amount determining device constitute a working group, between each working group mutually simultaneously Connection, the diversion pipe and gas loss amount compensation device, dead volume caliberating device, gas pressure measurement device, dead volume are filled Device, gas loss amount determining device pass through at least one control valve and are interconnected, and the control valve and control system electricity Gas connection.
2. a kind of coal-bed gas pressure test macro based on drilling sampling actual measurement according to claim 1, feature exist In: the gas loss amount compensation device include methane bottle, methane pressure reducer valve, pressure sensor, surge tank, control valve and Connecting pipeline, wherein the methane bottle is connected to methane pressure reducer valve, and is connected to by methane pressure reducer valve with connecting pipeline, it is described slow Deposit tank at least one, each buffer tank is airtight cavity structure, and each buffer tank is all provided with two flow-guiding mouths, and each flow-guiding mouth It is interconnected by a control valve and a connecting pipeline, in the connecting pipeline, wherein at least one and methane pressure reducer Valve is interconnected, and another at least one connecting pipeline and control valve are interconnected, and the pressure sensor is several, is located at each company Siphunculus road.
3. a kind of coal-bed gas pressure test macro based on drilling sampling actual measurement according to claim 1, feature exist In: the dead volume caliberating device includes helium tank, helium pressure reducing valve, pressure sensor, tank prover, control valve and connection Pipeline wherein the helium tank is connected to helium pressure reducing valve, and is connected to by helium pressure reducing valve with connecting pipeline, the tank prover At least one, each tank prover is airtight cavity structure, and each tank prover is all provided with two flow-guiding mouths, and each flow-guiding mouth is logical It crosses a control valve and a connecting pipeline is interconnected, in the connecting pipeline, wherein at least one and helium pressure reducing valve phase Intercommunicated, another at least one connecting pipeline and control valve are interconnected, and the pressure sensor is several, is located at each communicating pipe On the road.
4. a kind of coal-bed gas pressure test macro based on drilling sampling actual measurement according to claim 2 or 3, feature Be: the methane bottle, helium tank at least one, and when methane bottle, helium tank are two and are more than two, each first It is interconnected respectively by collecting pipe between alkane bottle and each helium tank.
5. a kind of coal-bed gas pressure test macro based on drilling sampling actual measurement according to claim 1, feature exist In: the gas pressure measurement device includes pressure gauge, pressure sensor, temperature sensor, detection tank, water bath with thermostatic control machine Structure, two-way joint, control valve and connecting pipeline, pressure gauge are connected with two-way joint, and pass through two-way joint and detection tank phase Intercommunicated, the detection tank is airtight cavity structure, and end face sets at least three flow-guiding mouths thereon, and one of flow-guiding mouth passes through company Siphunculus road is connected to two-way joint, and remaining two flow-guiding mouths are interconnected with control valve respectively by connecting pipeline, and pass through control Valve processed is interconnected with gas loss amount compensation device, dead volume caliberating device respectively, and the water bath with thermostatic control mechanism is coated on inspection Tank outer surface is surveyed, the two-way joint separately passes through connecting pipeline and control valve is interconnected, and the pressure sensor is several, respectively Positioned at each connecting pipeline and detection tank in, the temperature sensor at least one, embedded in detection tank in and around detection tank axis It is uniformly distributed.
6. a kind of coal-bed gas pressure test macro based on drilling sampling actual measurement according to claim 1, feature exist In: the dead volume filling device includes constant-flux pump, lubricating cup, two-way valve and connecting pipeline, wherein the two-way valve passes through Connecting pipeline and constant-flux pump are interconnected, and the constant-flux pump is interconnected by connecting pipeline and lubricating cup, and the two-way valve separately leads to It crosses connecting pipeline and control valve is interconnected, and pass through the two-way joint phase of communicating valve and diversion pipe and gas pressure measurement device It is intercommunicated.
7. a kind of coal-bed gas pressure test macro based on drilling sampling actual measurement according to claim 1, feature exist In: the gas loss amount determining device include desorption of mash gas instrument, coal sample tank, quick coupling, control valve and connecting pipeline, At least one control valve is set on the coal sample tank and is interconnected with control valve, and the control valve passes through connecting pipeline and fast quick access Head is interconnected, and the quick coupling and desorption of mash gas instrument are interconnected.
8. a kind of coal-bed gas pressure test macro based on drilling sampling actual measurement according to claim 1, feature exist In: the control system is the circuit based on being shared based on any one in industrial computer, personal computer or two kinds System, and the control system it is another at least one set network communication module.
9. a kind of test method of the coal-bed gas pressure test macro based on drilling sampling actual measurement, which is characterized in that the base In drilling sampling actual measurement coal-bed gas pressure test macro test method the following steps are included:
S1, equipment assembling, first to gas loss amount compensation device, dead volume caliberating device, gas pressure measurement device, dead volume Product filling device, gas loss amount determining device and control system carry out assembly and connection, constitute complete experimental system;
S2, preliminary test, experiment guarantee gas loss amount compensation device, dead volume caliberating device, gas pressure measurement before starting Device, dead volume filling device, each control valve of gas loss amount determining device are in close state, and then open helium atmosphere Steel bottle control valve, adjusting helium pressure reducing valve makes outlet pressure be not more than the range of pressure sensor, and is pouring into tank prover Nitrogen, and after the registration shown on computers by pressure sensor is stablized, pressure registration at this time is recorded in the controls P1, it is then again turned on control valve, nitrogen in tank prover is delivered in the detection tank of gas pressure measurement device, and in precision After pressure sensor shows that tank prover and detection pressure inside the tank are stablized, pressure value P in tank prover at this time is recorded2, then according to meter Calculate function:
P1V1/Z1=P2V2/Z2
Wherein:
Z1For P1Under the conditions of helium the compressed coefficient;
Z2For P2Under the conditions of helium the compressed coefficient;
It can obtain the nomadic nitrogen air volume V between detection tank and tank prover in pipeline0=V2-V1
And after to be calibrated, open control valve and release helium atmosphere, complete to be again sealed off after nitrogen release tank prover and Detect tank;
S3, equipment is prefabricated, gas pressure measurement device and gas loss amount determining device is ibid disassembled from experiment is lower, so Whole weighing is carried out to gas pressure measurement device and gas loss amount determining device afterwards:
Wherein it is connected between the whole control valve for weighing gas pressure measurement device, pressure gauge, two logical, detection tanks and component The mass M of pipeline1
The whole mass M for weighing the pipeline being connected between quick coupling, control valve, coal sample tank and component2
Then gas pressure measurement device is brought into underground together with gas loss amount determining device;
S4, sampling, according to People's Republic of China's safety in production professional standard " coal seam gas-bearing capacity underground Direct Determination (AQ1066-2008) " it, on newly exposed getting working face coal wall, is constructed one and is drilled with the vertical coal wall of electric coal drill, drilling arrives Start to sample when predetermined position, and records sample start times t1, the fresh coal sample of acquisition is divided into two parts and is respectively charged into and is adopted It is whole to weigh gas pressure measurement installation weight and be denoted as M in sample tank and coal sample tank3, whole to weigh the fixed dress of gas loss measurement It sets weight and is recorded as M4, the mass M of be packed into coal sample in sample can is then calculated5, (M5=M3-M1), institute in coal sample tank It is packed into the mass M of coal sample6, (M6=M4-M2);Time t when starting desorption after coal sample tinning is recorded simultaneously2, with desorption of mash gas instrument The coal sample for measuring the coal sample tank under different accumulation periods t adds up desorption of mash gas amount V, wherein 1-2 hour of minute;
S5 calculates gas loss amount, choosesMethod, according to coal sample start expose a period of time in V withDetermination in linear relation, it may be assumed that
In formula:
V --- the accumulation desorption of mash gas amount in the t time, cm3
VDamage 1--- exposure duration t0Interior gas loss amount, cm3
K --- coefficient;
Exposure duration before coal sample desorption measurement is (t0=t2-t1), corresponding to the V value measured under different accumulation periods t Desorption time is t0+t;WithFor abscissa, V is ordinate drawing, each measuring point in a linear relationship is determined by figure, so Afterwards according to the coordinate value of measuring point, gas loss amount is found out by least square method, and the gas damage of the coal of unit mass is calculated Vector
S6 calculates coal sample gas loss amount, gas pressure measurement system is accessed to again in the experimental system of S1 step composition, Then coal sample gas loss amount V in gas pressure measurement system is calculatedDamage 2(VDamage 2=M5×V′Damage 1), and according to PV=NRT, it calculates The amount N of the substance of gas loss amountDamage, it may be assumed that
In formula:
PWell--- underground atmospheric pressure, MPa;
VDamage 2--- exposure duration t0Interior gas loss amount, cm3
T --- downhole temperature;
R --- constant takes 8.314;
Meanwhile pressure gauge registration P at this time is recorded after pressure gauge registration is stablized3, and according to PV=NRT, it calculates coal sample tank (11) In existing free gas substance amount NIt is existing, it may be assumed that
In formula:
P3--- pressure gauge (9) registration, MPa;
V0--- the free volume of pipeline (including coal sample tank (25)), cm between control valve (8) and control valve (12)3
V3--- the dead volume of coal, cm3
T --- downhole temperature;
R --- constant takes 8.314;
Then, according to PV=NRT, prediction samples tank is filled with VDamage 2Afterwards, the registration P of pressure gauge (9)4,
That is:
In formula:
NIt is existing--- the amount of the substance of existing free gas, mol in coal sample tank (11);
NDamage--- the amount of the substance of loss gas amount, mol;
T --- downhole temperature;
R --- constant takes 8.314;
V0--- the free volume of pipeline (including coal sample tank (25)) between control valve (8) and control valve (12)), cm3
V3--- the dead volume of coal, cm3
S7, methane is prefabricated, based on calibration tank volume V4, according to P1V1/Z1=P2V2/Z2(Z1For P1Under the conditions of methane compression system Number, Z2For P2Under the conditions of methane the compressed coefficient), calculate the gas pressure that should be filled in tank proverThen methane gas steel cylinder is opened, methane pressure reducer valve is adjusted and makes to be punched into surge tank Interior pressure reaches gas pressure P5, it is then shut off methane gas steel cylinder, and be connected to surge tank with detection tank, while passing to pressure Sensor detects that pressure of methane is P5When, it closes disconnection surge tank and is connected with detection tank;
Constant-flux pump is opened in S8, oiling, by constant-flux pump oiling into detection tank, wherein injection oil mass value is (V0-V3), and examining It surveys injection oil mass value in tank and reaches (V0-V3) stop oiling after value and close detection tank;
S9 reads end value;After completing S8 operation, and after gauge hand is stablized, the pressure value detected in tank at this time is read P6, then P6As coal-bed gas pressure value.
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