CN103411868A - Measuring method for coal seam gas permeability coefficient - Google Patents

Measuring method for coal seam gas permeability coefficient Download PDF

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CN103411868A
CN103411868A CN2013103175978A CN201310317597A CN103411868A CN 103411868 A CN103411868 A CN 103411868A CN 2013103175978 A CN2013103175978 A CN 2013103175978A CN 201310317597 A CN201310317597 A CN 201310317597A CN 103411868 A CN103411868 A CN 103411868A
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gas
coal seam
coal
pressure
formula
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CN103411868B (en
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宋超
邓增社
陈通
王鹏
薛卫峰
赵泓超
徐文全
司俊鸿
王小军
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Shaanxi Coal and Chemical Technology Institute Co Ltd
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Shaanxi Coal and Chemical Technology Institute Co Ltd
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Abstract

The invention discloses a measuring method for a coal seam gas permeability coefficient, which comprises the following steps: constructing two drill holes, with the same depth, perpendicular to a coal seam at a certain interval, and recording the distance d between the two drill holes; obtaining coal seam absolute gas pressure p; injecting tracer gas into one drill hole, wherein an air compressor is connected with the drill hole so as to provide certain pressure for the drill hole, and connecting the other drill hole with a gas extraction system pipeline in a sealing manner; detecting the tracer gas, and determining the time t from the time when the drill hole is connected to the gas extraction system pipeline to the time when the tracer gas is detected; substituting the measuring result into a computational formula of the coal seam gas permeability coefficient to obtain the coal seam gas permeability coefficient. The computational process is simple; through the certain gas injection pressure provided by the compressor, and the connection between the other drill hole and the gas extraction system pipeline, orifices are kept under negative pressure. Therefore, the tracer gas can be measured quickly, the measuring period is short, and the general applicability is strong.

Description

A kind of method of testing of Permeability Coefficent in Coal Seam
Technical field
The present invention relates to the control of coalmine gas technical field, relate in particular to a kind of method of testing of Permeability Coefficent in Coal Seam.
Background technology
China is not only at present maximum in the world coal production state, and is maximum consumption of coal state, for a long time, coal in Chinese primary energy production and consumption structure proportion always more than 2/3rds.Be accompanied by the increase of the pit mining degree of depth and the rising of terrestrial stress, the outburst hazard in coal seam is increased day by day, China has become global coal and the most serious country of gas burst accident, and the number of times of coal and Gas Outburst and intensity also all reach the first in the world.Gas pumping is effective control gas accident, the guardian technique means that solve the China's coal-mine Safety production questions.And Permeability Coefficent in Coal Seam is the sign of the mobile complexity of coal-bed gas, it is the important parameter of estimating coal bed gas extraction complexity and gas outburst prevention treatment; Permeability Coefficent in Coal Seam is foundation and the basis of gas pumping design.Therefore, accurately test Permeability Coefficent in Coal Seam and play vital effect in the gas pumping work of mine.
China mainly adopts hole diameter to test Permeability Coefficent in Coal Seam to discharge method at present.But this method of testing need to be crossed repeatedly tentative calculation at one group of formula back warp when calculating permeability coefficient, just can find suitable computing formula, bring inconvenience to calculating.Theoretical analysis also shows simultaneously, and existing computing method also exist and can't find suitable computing formula or have two conflicting problems such as result of calculation.And at first hole diameter need the original gas pressure in Accurate Determining coal seam to discharge method, then test each drilling gas flow constantly; Its test period is longer, and for the less coal seam of coal-bed gas pressure, coal-bed gas pressure and drilling gas flow often are difficult to Accurate Determining, thereby its applicability also has been subject to certain restriction.
Summary of the invention
The object of the invention is to overcome the defect of prior art, provides that a kind of calculating is simple, test period is short, the method for testing of Permeability Coefficent in Coal Seam that can Measurement accuracy.
For achieving the above object, the present invention is by the following technical solutions:
A kind of method of testing of Permeability Coefficent in Coal Seam, comprise the steps:
(1) comparatively intact in coal seam, without tomography, without the place of shatter belt, keep at a certain distance away and the boring of two same depth of vertical coal seam construction, and record spacing of wells d;
(2) obtain the absolute gas pressure P in coal seam;
(3) tracer gas is injected in a boring wherein, and air compressor is connected to the pressure P that air compressor provides with this borehole sealing YShould be greater than the absolute gas pressure P in coal seam that step (2) is obtained; Another boring is connected with the gas drainage system line seal, and measures this drilling orifice negative pressure P C
(4) in the drilling orifice place be connected with gas pumping system, detect tracer gas every day, until tracer gas detected; And determine that this boring is from being connected to the gas drainage system pipeline to tracer gas time t used being detected;
(5) calculate Permeability Coefficent in Coal Seam λ, specifically comprise the steps:
1) measure the percolation flow velocity of tracer gas in coal seam, calculating formula is as follows:
v = d t
The percolation flow velocity of v-tracer gas in coal seam in formula, m/d;
D-spacing of wells, m;
T-detect tracer gas time used, d;
2) calculate Permeability Coefficent in Coal Seam, computation process is as follows:
As can be known by Darcy's law:
v = - k μ ∂ p ∂ x
K-permeability in formula, m 2
μ-coefficient of dynamic viscosity, Pas;
Have again the definition of Permeability Coefficent in Coal Seam to be:
λ = - Bk 2 μ P n
λ-Permeability Coefficent in Coal Seam in formula, m 2/ (MPa 2D);
B-unit conversion factor;
P n-normal atmospheric pressure, MPa;
The computing formula that above-mentioned two formula simultaneous integration can be obtained to Permeability Coefficent in Coal Seam is:
λ = Bvd 2 P n ( P Y - P C )
P in formula YThe pressure that-air compressor provides, MPa;
P C-drilling orifice extraction negative pressure, MPa.
Described step 2) in, obtaining the absolute gas pressure P concrete steps in coal seam is:
1) after drilling construction puts in place, measure coal seam gas-bearing capacity, and the samples of coal pulled technical analysis of carrying out coal obtains porosity and the unit weight of moisture, ash content and the coal of coal, and the gas-absorbent constant a of coal, the b value;
2) the absolute gas pressure in inverse coal seam, circular is: the gas-absorbent constant a of the gas bearing capacity that will record, technical analysis result and coal, the following computation model of b value substitution carries out computing, tries to achieve the absolute gas pressure P in coal seam:
W = abP 1 + bP · 100 - A d - M ad 100 · 1 1 + 0.31 M ad + 10 πP γ
The absolute gas pressure in P-coal seam in formula, MPa;
W-coal seam gas-bearing capacity, m 3/ t;
A, the gas-absorbent constant of b-coal;
A d-pit ash, %;
M AdThe moisture of-coal, %;
The porosity of π-coal, m 3/ m 3:
The unit weight of γ-coal, t/m 3.
Choose the maximal value of the absolute gas bearing capacity in coal seam of acquisition as the calculated value in later step.
Be connected to the boring of gas drainage system pipeline, connecting pipe should be provided with threeway and valve at the place, aperture, be used to measuring the aperture negative pressure and carrying out trace gas detection.
Described tracer gas is SF 6Tracer gas.
The invention provides a kind of simple method for testing bacterial resistance of Permeability Coefficent in Coal Seam, the boring of two same depth of vertical coal seam construction, obtain the absolute gas pressure in coal seam, in a boring, inject tracer gas, from another hole, detect tracer gas, by tracer gas time used and the spacing of wells being detected, calculate the drilling gas flow, in conjunction with the definition of Permeability Coefficent in Coal Seam, the computing formula that obtains Permeability Coefficent in Coal Seam is tried to achieve Permeability Coefficent in Coal Seam, and computation process is simple; By compressor, provide certain pressure, and with the gas drainage system pipeline, be connected and make aperture keep negative pressure in another boring, but Quick Measuring obtains tracer gas, test period is short, and general applicability is strong.
Further, gas-absorbent constant a by the gas bearing capacity, technical analysis result and the coal that record, b substitution computation model carries out computing, inverse is tried to achieve the absolute gas pressure in coal seam, by the spacing of wells with the tracer gas time used detected and try to achieve the drilling gas flow, finally try to achieve Permeability Coefficent in Coal Seam; Solved traditional coal seam permeability coefficient method of testing present low gas coal-bed gas pressure, the drilling gas flow is difficult to the problems such as Accurate Determining, test process is simple.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of test macro of the present invention;
In figure: the 1-injecting hole; The 2-extraction detects hole; The 3-coal seam; The 4-air compressor; The 5-tensimeter; The 6-connecting hose; The 7-ring flange; The 8-stop valve; 9-gas drainage system pipeline; The d-spacing of wells.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, two borings of d construction separated by a distance on coal seam 3 in the present embodiment, one is injecting hole 1, one is detected hole 2 for extraction, injecting hole 1 is connected to air compressor 4 by connecting hose 6, by ring flange 7, connect between the two, the pressure that air compressor 4 provides is observed by tensimeter 5; Extraction detects hole 2 and is connected to gas drainage system pipeline 9 by connecting hose, by ring flange 7, connect between the two, between the gas drainage system pipeline, also by ring flange, connect, and be negative pressure in the gas drainage system pipeline, can extract extraction and detect the gas in hole 2; The connecting hose that extraction detects between hole 2 and gas drainage system pipeline 9 is provided with gas detection mouthful, and stop valve 8 is installed, and stop valve 8 is in closed condition when flat, need carry out when gas detects opening stop valve 8 and detect.
The Permeability Coefficent in Coal Seam method of testing of the present embodiment, comprise the steps:
(1) comparatively intact in coal seam, without tomography, without the place of shatter belt, keep at a certain distance away and the boring of two same depth of vertical coal seam construction, be respectively injecting hole 1 and extraction and detect hole 2, and record spacing of wells d.
(2), after drilling construction puts in place, carry out the gas bearing capacity test job, and samples of coal pulled is carried out the technical analysis of coal and the gas-absorbent constant a of coal, b value; Two boring gas bearing capacities of surveying are got maximal value as the calculated value in later step; Wherein the technical analysis of coal mainly comprises porosity and the unit weight of moisture, ash content, volatile matter and the coal of coal.
(3) inverse coal-bed gas pressure, circular is: the gas-absorbent constant a of the gas bearing capacity that will record, technical analysis result and coal, the following computation model of b value substitution carries out computing, tries to achieve coal-bed gas pressure P:
W = abP 1 + bP · 100 - A d - M ad 100 · 1 1 + 0.31 M ad + 10 πP γ
The absolute gas pressure in P-coal seam in formula, MPa;
W-coal seam gas-bearing capacity, m 3/ t;
A, the gas-absorbent constant of b-coal;
A d-pit ash, %;
M AdThe moisture of-coal, %;
The porosity of π-coal, m 3/ m 3:
The unit weight of γ-coal, t/m 3.
(4) in two complete borings of construction, insert the sealing of hole sleeve pipe of certain-length, and between the wall of a borehole and sleeve pipe, carry out airtight shutoff, prevent gas leakage.
(5) in injecting hole 1, inject a certain amount of SF 6Tracer gas, and air compressor 4 is connected with injecting hole 1, the pressure P that air compressor provides YShould guarantee to be greater than the coal-bed gas pressure P of step 3 inverse, P YSize is by tensimeter 5 observations; Extraction detects hole 2 and is connected with gas drainage system pipeline 9, and measures aperture negative pressure P C.Between each linkage section, all utilize connecting hose 6 to connect, by ring flange 7, connect between each pipeline.
(6) in stop valve 8 places, detect SF every day 6Tracer gas, until detect SF 6Tracer gas; And determine that this boring is from being connected to gas drainage system pipeline 9 to SF being detected 6Tracer gas time t used.
(7) calculate Permeability Coefficent in Coal Seam λ, specifically comprise the steps:
1) measure SF 6The percolation flow velocity of tracer gas in coal seam, calculating formula is as follows:
v = d t
V-SF in formula 6The percolation flow velocity of tracer gas in coal seam, m/d;
D-spacing of wells, m;
T-detect SF 6The tracer gas time used, d.
2) calculate Permeability Coefficent in Coal Seam, computation process is as follows:
As can be known by Darcy's law:
v = - k μ ∂ p ∂ x
K-permeability in formula, m 2
μ-coefficient of dynamic viscosity, Pas;
Have again the definition of Permeability Coefficent in Coal Seam to be:
λ = - Bk 2 μ P n
λ-Permeability Coefficent in Coal Seam in formula, m 2/ (MPa 2D);
B-unit conversion factor;
P n-normal atmospheric pressure, MPa;
The computing formula that above-mentioned two formula simultaneous integration can be obtained to Permeability Coefficent in Coal Seam is:
λ = Bvd 2 P n ( P Y - P C )
P in formula YThe pressure that-air compressor provides, MPa;
P C-drilling orifice extraction negative pressure, MPa.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.

Claims (5)

1. the method for testing of a Permeability Coefficent in Coal Seam, is characterized in that comprising the steps:
(1) comparatively intact in coal seam, without tomography, without the place of shatter belt, keep at a certain distance away and the boring of two same depth of vertical coal seam construction, and record spacing of wells d;
(2) obtain the absolute gas pressure P in coal seam;
(3) tracer gas is injected in a boring wherein, and air compressor is connected to the pressure P that air compressor provides with this borehole sealing YShould be greater than the absolute gas pressure P in coal seam that step (2) is obtained; Another boring is connected with the gas drainage system line seal, and measures this drilling orifice negative pressure P C
(4) in the drilling orifice place be connected with gas pumping system, detect tracer gas every day, until tracer gas detected; And determine that this boring is from being connected to the gas drainage system pipeline to tracer gas time t used being detected;
(5) calculate Permeability Coefficent in Coal Seam λ, specifically comprise the steps:
1) measure the percolation flow velocity of tracer gas in coal seam, calculating formula is as follows:
v = d t
The percolation flow velocity of v-tracer gas in coal seam in formula, m/d;
D-spacing of wells, m;
T-detect tracer gas time used, d;
2) calculate Permeability Coefficent in Coal Seam, computation process is as follows:
As can be known by Darcy's law:
v = - k μ ∂ p ∂ x
K-permeability in formula, m 2
μ-coefficient of dynamic viscosity, Pas;
Have again the definition of Permeability Coefficent in Coal Seam to be:
λ = - Bk 2 μ P n
λ-Permeability Coefficent in Coal Seam in formula, m 2/ (MPa 2D);
B-unit conversion factor;
P n-normal atmospheric pressure, MPa;
The computing formula that above-mentioned two formula simultaneous integration can be obtained to Permeability Coefficent in Coal Seam is:
λ = Bvd 2 P n ( P Y - P C )
P in formula YThe pressure that-air compressor provides, MPa;
P C-drilling orifice extraction negative pressure, MPa.
2. the method for testing of Permeability Coefficent in Coal Seam according to claim 1, it is characterized in that: described step 2), obtaining the absolute gas pressure P concrete steps in coal seam is:
1) after drilling construction puts in place, measure coal seam gas-bearing capacity, and the samples of coal pulled technical analysis of carrying out coal obtains porosity and the unit weight of moisture, ash content and the coal of coal, and the gas-absorbent constant a of coal, the b value;
2) the absolute gas pressure in inverse coal seam, circular is: the gas-absorbent constant a of the gas bearing capacity that will record, technical analysis result and coal, the following computation model of b value substitution carries out computing, tries to achieve the absolute gas pressure P in coal seam:
W = abP 1 + bP · 100 - A d - M ad 100 · 1 1 + 0.31 M ad + 10 πP γ
The absolute gas pressure in P-coal seam in formula, MPa;
W-coal seam gas-bearing capacity, m 3/ t;
A, the gas-absorbent constant of b-coal;
A d-pit ash, %;
M AdThe moisture of-coal, %;
The porosity of π-coal, m 3/ m 3:
The unit weight of γ-coal, t/m 3.
3. the method for testing of Permeability Coefficent in Coal Seam according to claim 1 and 2 is characterized in that: choose the maximal value of the absolute gas bearing capacity in coal seam of acquisition as the calculated value in later step.
4. the method for testing of Permeability Coefficent in Coal Seam according to claim 1 and 2 is characterized in that: be connected to the boring of gas drainage system pipeline, connecting pipe should be provided with threeway and valve at the place, aperture, be used to measuring the aperture negative pressure and carrying out trace gas detection.
5. the method for testing of Permeability Coefficent in Coal Seam according to claim 1 and 2, it is characterized in that: described tracer gas is SF 6Tracer gas.
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CN103775056A (en) * 2013-12-06 2014-05-07 中国石油天然气股份有限公司 Fireflood well gas tracer detecting method
CN104048905A (en) * 2014-04-28 2014-09-17 上海浦马机电工程技术有限公司 Permeability detector of mixed minerals and permeability improvement method of mixed minerals
CN104345022A (en) * 2013-07-30 2015-02-11 河南煤业化工集团研究院有限责任公司 Method for directly testing permeability of underground coal seam
CN104406895A (en) * 2014-11-18 2015-03-11 河南理工大学 Novel coal bed permeability testing device and method
CN105866001A (en) * 2016-04-18 2016-08-17 三峡大学 Device and method for measuring rock-soil body osmotic coefficient based on water-based fluorescent agent dilution method
CN106124381A (en) * 2016-06-21 2016-11-16 河南理工大学 Hypotonic coal seam reservoirs gas free-boundary problem and the on-the-spot test method of permeability
CN106640182A (en) * 2016-12-30 2017-05-10 中国矿业大学(北京) Drilling gas minimum-flow measurement method
CN106706819A (en) * 2017-01-10 2017-05-24 新疆大学 Application of 1,1,1,2-tetrafluoroethane used as tracer in coal mine gas
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CN108444882A (en) * 2018-01-17 2018-08-24 南方电网科学研究院有限责任公司 A kind of experiment porch for measuring deep-well exhaust efficiency
CN109630100A (en) * 2018-10-31 2019-04-16 中国矿业大学 A kind of automation coal seam permeability test device and method
CN109682736A (en) * 2018-12-26 2019-04-26 河南理工大学 A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient
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WO2021103372A1 (en) * 2019-11-28 2021-06-03 山东科技大学 Mobile rapid coal rock permeability measuring instrument
CN113266315A (en) * 2021-06-17 2021-08-17 中国矿业大学 Method for determining permeability coefficient of coal seam
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