CN110243746A - A kind of device and method of layer-through drilling quick in situ test coal seam permeability - Google Patents
A kind of device and method of layer-through drilling quick in situ test coal seam permeability Download PDFInfo
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- CN110243746A CN110243746A CN201910587290.7A CN201910587290A CN110243746A CN 110243746 A CN110243746 A CN 110243746A CN 201910587290 A CN201910587290 A CN 201910587290A CN 110243746 A CN110243746 A CN 110243746A
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- 239000003245 coal Substances 0.000 title claims abstract description 157
- 238000005553 drilling Methods 0.000 title claims abstract description 105
- 238000012360 testing method Methods 0.000 title claims abstract description 92
- 230000035699 permeability Effects 0.000 title claims abstract description 64
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 140
- 239000007924 injection Substances 0.000 claims abstract description 140
- 239000002775 capsule Substances 0.000 claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000000605 extraction Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 12
- 239000011435 rock Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000009530 blood pressure measurement Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000010339 dilation Effects 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims 1
- 238000010998 test method Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 175
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
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- 238000005065 mining Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
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- 238000009738 saturating Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a kind of device and method of layer-through drilling quick in situ test coal seam permeability, device includes gas injection screen casing, and gas injection screen casing both ends are respectively equipped with the first and second capsules and blockade device, and first, which blockades device, is located between connection push rod and gas injection screen casing；First inside for blockading device is equipped with high-pressure gas injection pipe, and high-pressure gas injection pipe one end is connect with gas injection screen casing, and the other end is pierced by be connect with hydraulic intensifier, and pipeline is equipped with gas pressure sensor and gas mass flow controller；Hydraulic intensifier is separated into two cavities by rodless piston, and the first cavity passes through control valve respectively to be selected one with high-pressure gas injection pipe and pressure gas source and be connected to, and the second cavity is connected to the first outlet port of high pressure water pump group.Test method is based on test aperture apparatus and implements.The invention has the advantages that device is easy to operate, and it is easy to carry, it is reusable；Test method makes full use of the compressed air self-help equipment of underground coal mine and the convenience of high pressure water pump group to be tested, and is greatly improved coal seam permeability testing efficiency.
Description
Technical field
The invention belongs to coal bed gas extraction fields, and in particular to a kind of layer-through drilling quick in situ test coal seam permeability
Device and method.
Background technique
With gradually increasing for coal mining depth, the crustal stress and gas pressure in coal seam are continuously increased, underground coal mine watt
The Gas Disasters such as this explosion, coal and gas prominent take place frequently.For the generation for preventing Gas Disaster, before mining high gas coal seam,
Gas in preparatory extraction coal seam is needed, coal-bed gas pressure and gas bearing capacity are reduced.The main component of coal-bed gas is methane, is
The important component of Unconventional gas, draining coal seam gas can slow down the status of China's natural gas energy shortage.Therefore,
Draining coal seam gas not only contributes to safety of coal mines exploitation, and the exploitation for also helping clean energy resource utilizes.The extraction of coal-bed gas
Efficiency depends primarily on the permeability in coal seam, since condition of coal seam occurrence changes greatly, even if in same coal seam, differently
Point, depth coal body permeability may also have largely difference, this strong influence is to coal bed gas extraction effect
Assessment.
For the coal seam of low-permeability, it usually needs increase its infiltration using the regional or anti-reflection technology in locality coal seam
Property, improve coal bed gas extraction efficiency.After using the anti-reflection technical treatment coal seam in coal seam, it is generally difficult to be directly observed its anti-reflection
Effect can assess the antireflective effect in coal seam by way of testing coal seam permeability.The sealing of hole that coal mine uses at this stage is surveyed pressure and is surveyed
The test method of the gas permeability of coal seam such as stream is passed through by carrying out flow and pressure monitoring during coal-bed gas tries extraction
Formula, which calculates, obtains coal seam permeability.Due to needing through the flow speed data under a variety of pressure conditions, it is more accurate to obtain
Permeability.Therefore its testing time is long, is unfavorable for the quick and precisely acquisition of coal seam permeability.Although occurring coal seam in-situ at present
Test method, this method realizes the setting of layer-through drilling by capsule hole, then, by test device as the sealing of drilling
Flow and pressure test are carried out in section, can be obtained more accurate permeability result relative to ex situ test, be taken out for gas
It adopts recruitment evaluation and more accurate foundation is provided, but this method is still to carry out in the discharge process of gas examination extraction, it is difficult to
Radical change length of testing speech degree, or, it is difficult to obtain more various test data.Therefore, for it is more convenient, rapidly carry out
Coal seam permeability in-situ test accurately assesses coal bed gas extraction effect, and the present invention provides a kind of layer-through drilling is quickly former
The device and method of bit test coal seam permeability.
Summary of the invention
The first object of the present invention is aiming at progress coal seam permeability test during drawing-off gas in the prior art
The deficiency that time-consuming provides a kind of device of layer-through drilling quick in situ test coal seam permeability, which includes that capsule is blockaded
Device and hydraulic intensifier form setting, pass through hydraulic intensifier to blockade device both ends outside the coal seam of layer-through drilling by capsule
High pressure gas is injected into coal seam seal section, by controling and monitoring to injection gas pressure and flow velocity, to obtain coal seam
Gas permeation rate.Its structure is simple, and test is time-consuming short, and can get the stream under a variety of pressure conditions by the variation of injection pressure
Parameter is measured, keeps permeability test result more accurate.The second object of the present invention is to provide a kind of layer-through drilling quick in situ survey
The method for trying coal seam permeability, this method are implemented based on aforementioned device, and using stepped incremental manner increase injection seal section
Pressure, then to obtain coal seam in-situ permeability by this method, more accurately estimate the extracting result knot in coal seam to obtain
Fruit creates conditions.
To realize that the first purpose, the present invention adopt the following technical scheme that.
A kind of device of layer-through drilling quick in situ test coal seam permeability, before being located at the connection push rod of tubular structure
The gas injection screen casing at end, gas injection screen casing both ends are respectively equipped with that the first capsule blockades device and the second capsule blockades device, and the first capsule is blockaded
Device is connected between connection push rod and gas injection screen casing；The inside that first capsule blockades device is equipped with high-pressure gas injection pipe, high-pressure gas injection
Pipe one end is connect with the input end of gas injection screen casing, and the other end is connect by being pierced by inside connection push rod with hydraulic intensifier, and high
The pipeline of pressure injection tracheae is equipped with gas pressure sensor and gas mass flow controller；It is living equipped with no bar in hydraulic intensifier
Plug, hydraulic intensifier are separated into two cavities by rodless piston, the first cavity pass through respectively control valve and high-pressure gas injection pipe and
Pressure gas source selects a connection, and the second cavity is connected to the first outlet port of high pressure water pump group；Second capsule blockades device
Water filling port is connected to the capsule cavity that the first capsule blockades device, and the first capsule blockades the water filling port and high pressure water pump group of device
The connection of second outlet port.
Using the present invention of preceding solution, device is blockaded by capsule and forms waterpower seat at the coal seam section both ends of drilling
Envelope makes the coal seam section of layer-through drilling form seal section.When test, by hydraulic booster mode into coal seam injection pressure gas,
To by obtaining coal seam permeability to the injection parametric measurements such as gas pressure and flow velocity, and by conversion.Relative to conventional measurement
For method for testing and existing home position testing method, do not carried out by detection methane gas, the gas injected by high pressure
Body carries out.Its test is time-consuming short, and can get the flow parameter under a variety of pressure conditions by the variation of injection pressure, makes to permeate
Rate test result is more accurate, and apparatus structure is simple and convenient to operate.
Preferably, first capsule blockades device and the second capsule blockades the bearing capacity of device not less than 20MPa；Described
Gas injection pipeline bearing capacity ratio between one cavity and gas injection screen casing is less than 10MPa.To realize the high pressure gas injection within 10MPa
Effect, it is ensured that there is wide in range boost range, realize more accurate test effect.
Preferably, the pressure gas source is underground wind pressure self-rescuer.It is existing into lower condition to make full use of, it is quasi- to reduce test
Standby workload, improves testing efficiency, reduces testing cost.
It is further preferred that the connection push rod is made of the pipeline section that more piece screws togather spreading.To be selected according to coal seam depth
Pipeline section quantity and length, it is ensured that use scope is wide.
Preferably, the high-pressure gas injection pipe and pressure gas source pass through corresponding fluid stop valve and first cavity respectively
A connection is selected in formation.To realize on-off control by the universal valve of technology maturation, device complexity is reduced, failure is reduced
Rate, it is ensured that device operational reliability.
To realize that the second purpose, the present invention adopt the following technical scheme that.
A kind of method of layer-through drilling quick in situ test coal seam permeability, it is real based on the device for realizing first invention purpose
It applies, comprising the following steps:
The first step, test prepare: including wearing layer testing bore holes arrangement and test device installation connection；Wherein, layer test is worn
Drilling arrangement includes, according to the positional relationship between job location and coal seam, in main haulage roadway, suction road, the lane Di Chou or crossdrift
Arrangement wears a layer testing bore holes in rocks tunnel；Merging drilling in layer-through drilling diameter and coal seam permeability in-situ testing device
Connection push rod, gas injection screen casing and capsule blockade device and match；And in layer-through drilling work progress, drilling rock segment length is recorded
With coal seam segment length；Test device installation connection includes that high pressure water pump group is arranged in underground, by connection relationship and passes through setting
Fixation is connected and sealed in gasket seal, and connects data line；It determines and connects by drilling rock segment length and coal seam segment length
Push rod length is connect, and gas injection screen casing and capsule are blockaded into device with the connection push rod of determining length and are placed in drilling；
Primitive coalbed gas pressure measurement: second step is blockaded to two capsules using high pressure water pump group and injects high pressure in device
Water makes the expansion of its capsule be close to drill hole inner wall, realizes the sealing to drilling coal seam section, to form drilling coal seam seal section；Again
The gas in the first cavity will be previously implanted using high pressure water pump group and hydraulic intensifier with constant pressure injection hole coal seam
Seal section；After the gas pressure for the coal seam seal section that drills reaches target value, closing control valve；Etc. coal seam seal section hole to be drilled
Gas pressure stablize, and the stable pressure value is defined as the original gas pressure in coal seam；
Third step, constant speed inject gas: keeping the first chamber pressure using hydraulic intensifier and high pressure water pump group, pass through gas
Weight flow controller injects gas to drilling coal seam seal section with constant speed；It is monitored and is bored by gas pressure sensor
The gas pressure of hole coal seam seal section；After gas pressure is stablized, with stepped incremental manner increase gas injection rate, and
Under the conditions of gas with various injection rate, the stabilizing gas pressure value of measurement drilling coal seam seal section；
4th step, coal seam permeability calculate:
Firstly, first judge whether flowing of the gas in coal seam of injection belongs to Darcy Flow, according to gas injection rate,
Corresponding injection gas pressure and primitive coalbed gas pressure, describe gas injection speed Q in rectangular coordinate systemscWith the pressure difference of two squares
(P1 2-P0 2) between functional relation, verifying with gas injection pressure raising, gas injection speed QscWhether with the pressure difference of two squares (P1 2-
P0 2) in a linear relationship；
Gas injection speed and pressure difference of two squares data point in a linear relationship are chosen again, according to gas injection rate, corresponding
It injects gas pressure, drilling coal seam sealing segment length and original gas pressure and calculates coal seam permeability；
Coal seam permeability calculation formula is as follows:
In formula: k is rock permeability；
PscThe pressure of gas is injected under standard atmosphere condition；
QscThe volume flow of gas is injected under standard atmosphere condition；
μ is aerodynamic force viscosity coefficient；
L is that drilling coal seam seals segment length, the length and gas injection screen casing equal length；
P1For to drilling the gas injection of coal seam seal section when gas pressure；
P0For primitive coalbed gas pressure；
routTo test the radius of influence, L+b/2 can be taken as in engineer application, wherein b is that single capsule blockades device length；
rinFor boring radius；
It averages to the multi-group data being calculated, coal seam permeability can be obtained；
5th step removes in-situ test coal seam permeability equipment: the gas pressure and capsule envelope injected in removal drilling
Hinder the hydraulic pressure in device；Using mining-drilling machine will connect push rod, capsule blockades device and the extraction drilling of gas injection screen casing.
Using the present invention of aforementioned schemes, simultaneously driller in place, later, will realize first invention mesh to arrangement testing bore holes first
Device be attached, install, then carry out drilling coal seam section waterpower it is setting；Finally, close to drilling coal seam by hydraulic intensifier
It seals section and injects high pressure gas, thus by the injection parametric measurements such as gas pressure and flow velocity, and coal seam is obtained by conversion and is seeped
Saturating rate.For conventional test methodologies and existing home position testing method, do not carried out by detection methane gas,
It is carried out by the gas that high pressure is injected.It is short that it tests time-consuming, and can get under a variety of pressure conditions by the variation of injection pressure
Flow parameter, keep permeability test result more accurate.
Preferably, the specific connection procedure of test device includes: to be separately connected first glue at the both ends of gas injection screen casing
It is encapsulated resistance device and the second capsule blockades device, the first capsule blockades device and the second capsule is blockaded device and is connected to by waterflood path, water filling
Channel is connect with high pressure water injection pipe；High-pressure gas injection pipe is connected with the inlet channel that the first capsule blockades device；By high-pressure gas injection
Pipe is passed through from the hollow portion of connection push rod, and connection push rod is blockaded device free end with the first capsule and is connect；Utilize mining-drilling machine
With connection push rod by the second capsule blockade device towards drilling inner end in the way of by gas injection screen casing and two capsules blockade device push into
In drilling and to predetermined position；High-pressure gas injection pipe is passed sequentially through into fluid stop valve and gas mass flow controller and waterpower again
First cavity of booster connects, and gas pressure sensor is arranged on connecting line；Finally by high pressure water injection pipe and waterpower
Second cavity of booster is respectively communicated with two outlet pipelines of high pressure water pump group respectively, and one is respectively arranged in respective line
Fluid stop valve.So that test device connection is correct, it is reliable for operation, it is ensured that test result is accurate.
It is further preferred that the drilling coal seam seal section refers to that two capsules after capsule dilation by water injection blockade the brill between device
The bearing capacity of bore portion, the drilling coal seam seal section is more than or equal to 10MPa.To obtain broader boost range, it is ensured that detection
As a result more accurate.
It is further preferred that the gas pressure target value of injection hole coal seam seal section is when original gas pressure is tested
Pass through the original gas pressure value tested adjacent coal seam.To utilize adjacent coal seam and the original gas pressure parameter in this coal seam
Identical or close feature carries out the test of the original gas pressure in this coal seam, further increases the rapidity of test.
It is further preferred that the step type incremental manner increases gas injection rate and refers to, in drilling coal seam seal section
Gas pressure reach balance after, improve gas injection rate to a certain value, after gas pressure is stablized, be further continued for improving injection
Speed is to next value.Test data to ensure each pressure stage is accurate, and then ensures the correctness of test result and reliable
Property.
The invention has the following advantages: test device is easy to operate, and it is easy to carry, it is reusable；Test method
Make full use of the common compressed air self-help equipment of mine and high pressure water pump group and in-situ test coal seam permeability equipment rapidly into
The test of row coal seam in-situ permeability, is greatly improved permeability testing efficiency, mentions for the accurate prediction of coal bed gas extraction effect
For basic data.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of apparatus of the present invention.
Fig. 2 is the connection relationship diagram of the setting system and gas injection screen casing in apparatus of the present invention.
Fig. 3 is the hydraulic booster system schematic in apparatus of the present invention.
Fig. 4 is the flow diagram that coal seam permeability detection in situ is carried out using apparatus of the present invention.
Specific embodiment
Type of the present invention is further described with reference to the accompanying drawing, embodiment is exemplary, and is only used for disclosing reconciliation
Release type of the present invention, to fully understand type of the present invention, but not therefore by type of the present invention be limited in the embodiment described range it
It is interior.
Embodiment 1, referring to Fig. 1, Fig. 2, Fig. 3, a kind of device of layer-through drilling quick in situ test coal seam permeability, including
Gas injection screen casing 2 positioned at connection 1 front end of push rod of tubular structure, 2 both ends of gas injection screen casing are respectively equipped with the first capsule and blockade 3 He of device
Second capsule blockades device 4, and the first capsule is blockaded device 3 and is connected between connection push rod 1 and gas injection screen casing 2；First capsule blockades device 3
Inside be equipped with high-pressure gas injection pipe 5,5 one end of high-pressure gas injection pipe is connect with the input end of gas injection screen casing 2, and the other end is pushed away by connecting
It is pierced by inside bar 1, and is connect with hydraulic intensifier 6, and the pipeline of high-pressure gas injection pipe 5 is gentle equipped with gas pressure sensor 11
Weight flow controller 12 is equipped with a fluid stop valve between gas pressure sensor 11 and gas mass flow controller 12
13；Rodless piston 7 is equipped in hydraulic intensifier 6, hydraulic intensifier 6 is separated into two cavities, the first cavity point by rodless piston 7
Not Tong Guo control valve select one with high-pressure gas injection pipe 5 and pressure gas source 8 and be connected to, the second cavity goes out with the first of high pressure water pump group 9
Mouth port passes through a fluid stop valve 13 and is connected to；Second capsule blockades the water filling port of device 4 and the first capsule blockades the glue of device 3
Capsule internal cavities are connected to by capsule communicating pipe 14, and the first capsule blockades the water filling port of device 3 and the second outlet of high pressure water pump group 9
Port is connected to by high pressure water injection pipeline 15, and high pressure water injection pipeline 15 is equipped with a fluid stop valve 13.
Wherein, first capsule blockades device 3 and the second capsule blockades the bearing capacity of device 4 not less than 20MPa；Described
Gas injection pipeline bearing capacity ratio between one cavity and gas injection screen casing 2 is less than 10MPa.Pressure gas source 8 is saved oneself from underground wind pressure
Device.Connection push rod 1 is made of the pipeline section that more piece screws togather spreading.High-pressure gas injection pipe 5 and pressure gas source 8 pass through corresponding one stream respectively
Body shut-off valve 13 is selected one with the formation of the first cavity and is connected to.
The present embodiment constitutes setting system, setting system and gas injection screen casing 2 by two capsule holes and is connected by multistage
The extension that push rod 1 carries out length direction is connect, using in the push-in of mining-drilling machine 16 drilling 17, hydraulic booster system 18 is recycled to carry out
Setting and injection high pressure gas and then progress coal seam permeability detection in situ into coal seam, wherein hydraulic booster system 18 is mainly
Including high-pressure gas injection pipe 5, high pressure water injection pipeline 15, hydraulic intensifier 6, underground wind pressure self-rescuer and high pressure water pump group 9.
Embodiment 2 referring to fig. 4, and combines Fig. 1, Fig. 2, Fig. 3, a kind of layer-through drilling quick in situ test coal seam permeability
Method, based on realize first invention purpose device implement, comprising the following steps:
The first step, test prepare: including wearing layer testing bore holes arrangement and test device installation connection；Wherein, layer test is worn
Drilling arrangement includes, according to the positional relationship between job location and coal seam, in main haulage roadway, suction road, the lane Di Chou or crossdrift
Arrangement wears a layer testing bore holes in rocks tunnel；Merging drilling in layer-through drilling diameter and coal seam permeability in-situ testing device
Connection push rod 1, gas injection screen casing 2 and capsule blockade device and match；And in layer-through drilling work progress, drilling rock segment length is recorded
Degree and coal seam segment length；Test device installation connection includes that high pressure water pump group 9 is arranged in underground, by connection relationship and is passed through
Fixation is connected and sealed in setting gasket seal, and connects data line；It is true by drilling rock segment length and coal seam segment length
Surely 1 length of push rod is connected, and gas injection screen casing 2 and capsule are blockaded into device with the connection push rod of determining length and are placed in drilling；
Primitive coalbed gas pressure measurement: second step is blockaded to two capsules using high pressure water pump group 9 and injects high pressure in device
Water makes the expansion of its capsule be close to drill hole inner wall, realizes the sealing to drilling coal seam section, to form drilling coal seam seal section；Again
The gas in the first cavity will be previously implanted using high pressure water pump group 9 and hydraulic intensifier 6 with constant pressure injection hole coal
Layer seal section；After the gas pressure for the coal seam seal section that drills reaches target value, closing control valve；It is sealed etc. coal seam hole to be drilled
The gas pressure of section is stablized, and the stable pressure value is defined as the original gas pressure in coal seam；
Third step, constant speed inject gas: keeping the first chamber pressure using hydraulic intensifier and high pressure water pump group 9, pass through
Gas mass flow controller 12 injects gas to drilling coal seam seal section with constant speed；Pass through gas pressure sensor 11
The gas pressure of monitoring drilling coal seam seal section；After gas pressure is stablized, gas injection speed is increased with stepped incremental manner
Degree, and under the conditions of gas with various injection rate, the stabilizing gas pressure value of measurement drilling coal seam seal section；
4th step, coal seam permeability calculate:
Firstly, first judge whether flowing of the gas in coal seam of injection belongs to Darcy Flow, according to gas injection rate,
Corresponding injection gas pressure and primitive coalbed gas pressure, describe gas injection speed Q in rectangular coordinate systemscWith the pressure difference of two squares
(P1 2-P0 2) between functional relation, verifying with gas injection pressure raising, gas injection speed QscWhether with the pressure difference of two squares (P1 2-
P0 2) in a linear relationship；
Gas injection speed and pressure difference of two squares data point in a linear relationship are chosen again, according to gas injection rate, corresponding
It injects gas pressure, drilling coal seam sealing segment length and original gas pressure and calculates coal seam permeability；
Coal seam permeability calculation formula is as follows:
In formula: k is rock permeability；
PscThe pressure of gas is injected under standard atmosphere condition；
QscThe volume flow of gas is injected under standard atmosphere condition；
μ is aerodynamic force viscosity coefficient；
L is that drilling coal seam seals segment length, the length and gas injection screen casing equal length；
P1For to drilling the gas injection of coal seam seal section when gas pressure；
P0For primitive coalbed gas pressure；
routTo test the radius of influence, L+b/2 can be taken as in engineer application, wherein b is that single capsule blockades device length；
rinFor boring radius；
It averages to the multi-group data being calculated, coal seam permeability can be obtained；
5th step removes in-situ test coal seam permeability equipment: the gas pressure and capsule envelope injected in removal drilling
Hinder the hydraulic pressure in device；Using mining-drilling machine will connect push rod, capsule blockades device and the extraction drilling of gas injection screen casing；It will be in situ after dismounting
The transfer of coal seam permeability equipment is tested, to be tested next time.
Wherein, the specific connection procedure of test device includes: to be separately connected first capsule at the both ends of gas injection screen casing 2
It blockades device 3 and the second capsule blockades device 4, the first capsule blockades device 3 and blockades device 4 with the second capsule to be connected to by waterflood path, is infused
Aquaporin is connect with high pressure water injection pipe；High-pressure gas injection pipe 5 is connected with the inlet channel that the first capsule blockades device 3；By high pressure
Air injection pipe 5 is passed through from the hollow portion of connection push rod 1, and connection push rod 1 is blockaded 3 free end of device with the first capsule and is connect；It utilizes
Mining-drilling machine and connection push rod 1 seal gas injection screen casing and two capsules in such a way that the second capsule blockades device 4 towards drilling inner end
Resistance device pushes in drilling and to predetermined position；High-pressure gas injection pipe 5 is passed sequentially through into fluid stop valve 13 and gas mass flow again
Amount controller 12 is connect with the first cavity of hydraulic intensifier 6, and gas pressure sensor 11 is arranged on connecting line；Finally
Second cavity of high pressure water injection pipe and hydraulic intensifier 6 is respectively communicated with two outlet pipelines of high pressure water pump group 9 respectively, and
One fluid stop valve 13 is respectively set in respective line.
Wherein, drilling coal seam seal section refers to that two capsules after capsule dilation by water injection blockade the bore portion between device, the brill
The bearing capacity of hole coal seam seal section is more than or equal to 10MPa.The gas pressure target value of injection hole coal seam seal section is neighbouring
The original gas pressure value that coal seam is tested.Stepped incremental manner increases gas injection rate and refers to, close in drilling coal seam
After the gas pressure of envelope section reaches balance, improves gas injection rate and be further continued for improving after gas pressure is stablized to a certain value
Injection rate is to next value.
This method closes gas pressure sensor 11 and hydraulic intensifier 6 before injecting high pressure gas not yet into drilling
Between any fluid stop valve 13, can pass through gas pressure sensor 11 obtain primitive coalbed gas pressure value.
This detection method and its corresponding device, the gas pressure sensor when carrying out permeability test, for test
11 and 12 class precision instrument of gas mass flow controller to be arranged at drilling outer, it is existing it is not necessary that detection instrument is arranged in drilling
For the home position testing method that detecting head is located in drilling, eliminates test quasi-instrument and be set to drilling, or from drilling
The hidden danger damaged or damaged during taking-up has excellent reuse characteristic.
The preferred embodiment of type of the present invention is described in detail above.It should be appreciated that those skilled in the art
Without creative work can the design of type according to the present invention make many modifications and variations.Therefore, it is all in the art
Technical staff passes through logical analysis, reasoning, or a limited experiment according to the design of type of the present invention on the basis of existing technology can be with
Obtained technical solution, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of device of layer-through drilling quick in situ test coal seam permeability, which is characterized in that including being located at tubular structure
The gas injection screen casing (2) of push rod (1) front end is connected, gas injection screen casing (2) both ends are respectively equipped with the first capsule and blockade device (3) and the second glue
It is encapsulated resistance device (4), the first capsule is blockaded device (3) and is connected between connection push rod (1) and gas injection screen casing (2)；First capsule is blockaded
The inside of device (3) is equipped with high-pressure gas injection pipe (5), and high-pressure gas injection pipe (5) one end is connect with the input end of gas injection screen casing (2), separately
One end is connect by being pierced by inside connection push rod (1) with hydraulic intensifier (6), and the pipeline of high-pressure gas injection pipe (5) is equipped with gas
Pressure sensor (11) and gas mass flow controller (12)；Rodless piston (7) are equipped in hydraulic intensifier (6), waterpower
Booster (6) is separated into two cavities by rodless piston (7), and the first cavity passes through control valve and high-pressure gas injection pipe (5) respectively
It selects one with pressure gas source (8) to be connected to, the second cavity is connected to the first outlet port of high pressure water pump group (9)；Second capsule
The water filling port for blockading device (4) is connected to the capsule cavity that the first capsule blockades device (3).
2. the device of layer-through drilling quick in situ test coal seam permeability according to claim 1, which is characterized in that described
First capsule blockades device (3) and the second capsule blockades the bearing capacity of device (4) not less than 20MPa；First cavity and gas injection
Gas injection pipeline bearing capacity between screen casing (2) is not less than 10MPa.
3. the device of layer-through drilling quick in situ test coal seam permeability according to claim 1, which is characterized in that described
Pressure gas source (8) comes from underground wind pressure self-rescuer.
4. the device of layer-through drilling quick in situ test coal seam permeability according to claim 1, which is characterized in that described
Connection push rod (1) is made of the pipeline section that more piece screws togather spreading.
5. layer-through drilling quick in situ described according to claim 1~any one of 4 tests the device of coal seam permeability,
It is characterized in that, the high-pressure gas injection pipe (5) and pressure gas source (8) pass through corresponding fluid stop valve (13) and described first respectively
A connection is selected in cavity formation.
6. a kind of method of layer-through drilling quick in situ test coal seam permeability, which is characterized in that based in Claims 1 to 5
Device described in any one is implemented, comprising the following steps:
The first step, test prepare: including wearing layer testing bore holes arrangement and test device installation connection；Wherein, a layer testing bore holes are worn
Arrangement includes, according to the positional relationship between job location and coal seam, in main haulage roadway, suction road, the lane Di Chou or crossdrift class rock
Arrangement wears a layer testing bore holes in stone tunnel；The connection of drilling is placed in layer-through drilling diameter and coal seam permeability in-situ testing device
Push rod (1), gas injection screen casing (2) and capsule blockade device and match；And in layer-through drilling work progress, drilling rock segment length is recorded
Degree and coal seam segment length；Test device installation connection includes that high pressure water pump group (9) is arranged in underground, by connection relationship and is led to
It crosses setting gasket seal and fixation is connected and sealed, and connect data line；By drilling rock segment length and coal seam segment length
It determines connection push rod (1) length, and gas injection screen casing (2) and capsule is blockaded into device with the connection push rod of determining length and are placed in drilling
In；
Primitive coalbed gas pressure measurement: second step is blockaded to two capsules using high pressure water pump group (9) and injects high pressure in device
Water makes the expansion of its capsule be close to drill hole inner wall, realizes the sealing to drilling coal seam section, to form drilling coal seam seal section；Again
The gas in the first cavity will be previously implanted using high pressure water pump group (9) and hydraulic intensifier (6) to bore with constant pressure injection
Hole coal seam seal section；After the gas pressure for the coal seam seal section that drills reaches target value, closing control valve；Etc. coal seam hole to be drilled
The gas pressure of seal section is stablized, and the stable pressure value is defined as the original gas pressure in coal seam；
Third step, constant speed inject gas: keeping the first chamber pressure using hydraulic intensifier and high pressure water pump group (9), pass through gas
Weight flow controller (12) injects gas to drilling coal seam seal section with constant speed；Pass through gas pressure sensor
(11) gas pressure of monitoring drilling coal seam seal section；After gas pressure is stablized, gas note is increased with stepped incremental manner
Enter speed, and under the conditions of gas with various injection rate, the stabilizing gas pressure value of measurement drilling coal seam seal section；
4th step, coal seam permeability calculate:
Firstly, first judging whether flowing of the gas of injection in coal seam belongs to Darcy Flow, according to gas injection rate, correspondence
Injection gas pressure and primitive coalbed gas pressure, gas injection speed Q is described in rectangular coordinate systemscWith the pressure difference of two squares
(P1 2-P0 2) between functional relation, verifying with gas injection pressure raising, gas injection speed QscWhether with the pressure difference of two squares (P1 2-
P0 2) in a linear relationship；
Gas injection speed and pressure difference of two squares data point in a linear relationship are chosen again, according to gas injection rate, corresponding injection
Gas pressure, drilling coal seam sealing segment length and original gas pressure calculate coal seam permeability；
Coal seam permeability calculation formula is as follows:
In formula: k is rock permeability；
PscThe pressure of gas is injected under standard atmosphere condition；
QscThe volume flow of gas is injected under standard atmosphere condition；
μ is aerodynamic force viscosity coefficient；
L is that drilling coal seam seals segment length, the length and gas injection screen casing equal length；
P1For to drilling the gas injection of coal seam seal section when gas pressure；
P0For primitive coalbed gas pressure；
routTo test the radius of influence, L+b/2 can be taken as in engineer application, wherein b is that single capsule blockades device length；
rinFor boring radius；
It averages to the multi-group data being calculated, coal seam permeability can be obtained；
5th step removes in-situ test coal seam permeability equipment: the gas pressure and capsule injected in removal drilling blockades device
In hydraulic pressure；Using mining-drilling machine will connect push rod, capsule blockades device and the extraction drilling of gas injection screen casing.
7. the method for layer-through drilling quick in situ test coal seam permeability according to claim 6, which is characterized in that test
The specific connection procedure of device includes: to be separately connected first capsule at the both ends of gas injection screen casing (2) to blockade device (3) and second
Capsule is blockaded device (4), and the first capsule blockades device (3) and blockades device (4) with the second capsule to be connected to by waterflood path, waterflood path with
The connection of high pressure water injection pipe；High-pressure gas injection pipe (5) is connected with the inlet channel that the first capsule blockades device (3)；By high-pressure gas injection
Pipe (5) is passed through from the hollow portion of connection push rod (1), and connection push rod (1) is blockaded device (3) free end with the first capsule and is connect；
Using mining-drilling machine and connection push rod (1) by gas injection screen casing and two in such a way that the second capsule blockades device (4) towards drilling inner end
A capsule is blockaded device and is pushed in drilling and to predetermined position；High-pressure gas injection pipe (5) is passed sequentially through into fluid stop valve (13) again
It is connect with gas mass flow controller (12) with the first cavity of hydraulic intensifier (6), and gas is set on connecting line
Pressure sensor (11)；Finally by the second cavity of high pressure water injection pipe and hydraulic intensifier (6) respectively with high pressure water pump group (9)
Two outlet pipelines are respectively communicated with, and a fluid stop valve (13) are respectively arranged in respective line.
8. the method for layer-through drilling quick in situ test coal seam permeability according to claim 7, which is characterized in that described
Drilling coal seam seal section refers to that two capsules after capsule dilation by water injection blockade the bore portion between device, the drilling coal seam seal section
Bearing capacity is more than or equal to 10MPa.
9. the method for layer-through drilling quick in situ according to claim 6 test coal seam permeability, which is characterized in that the
In two steps, the gas pressure target value of injection hole coal seam seal section is the original gas pressure by testing adjacent coal seam
Force value.
10. the method for layer-through drilling quick in situ test coal seam permeability according to claim 7, which is characterized in that institute
It states stepped incremental manner increase gas injection rate to refer to, after the gas pressure of drilling coal seam seal section reaches balance, mention
High gas injection rate is further continued for improving injection rate to next value after gas pressure is stablized to a certain value.
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| CN111551475A (en) * | 2020-04-07 | 2020-08-18 | 重庆大学 | Portable device and method for rapidly testing permeability of coal seam in situ through layer drilling |
| CN111665183A (en) * | 2020-06-17 | 2020-09-15 | 长江勘测规划设计研究有限责任公司 | Rock mass permeability coefficient measuring method based on drilling water pressure test |
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| CN113237811A (en) * | 2021-04-27 | 2021-08-10 | 深圳大学 | Combined test method for in-situ coal seam permeability and mining stress |
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| CN110987754A (en) * | 2019-11-28 | 2020-04-10 | 山东科技大学 | In-situ measurement method for coal seam permeability |
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| CN111551475A (en) * | 2020-04-07 | 2020-08-18 | 重庆大学 | Portable device and method for rapidly testing permeability of coal seam in situ through layer drilling |
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| CN111665183A (en) * | 2020-06-17 | 2020-09-15 | 长江勘测规划设计研究有限责任公司 | Rock mass permeability coefficient measuring method based on drilling water pressure test |
| CN111665183B (en) * | 2020-06-17 | 2022-08-26 | 长江勘测规划设计研究有限责任公司 | Rock mass permeability coefficient measuring method based on drilling water pressure test |
| CN113138150A (en) * | 2021-04-27 | 2021-07-20 | 中国平煤神马能源化工集团有限责任公司 | Transient pressure-based low-permeability coal seam in-situ permeability testing method and device |
| CN113237811A (en) * | 2021-04-27 | 2021-08-10 | 深圳大学 | Combined test method for in-situ coal seam permeability and mining stress |
| CN113153274A (en) * | 2021-04-30 | 2021-07-23 | 中国矿业大学 | Deep coal seam in-situ gas content measuring method |
| CN113153274B (en) * | 2021-04-30 | 2022-09-09 | 中国矿业大学 | Deep coal seam in-situ gas content measuring method |
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