CN105041370B - A kind of concordant hole pumping and mining coal-bed gas two-dimensional flow field method of testing - Google Patents
A kind of concordant hole pumping and mining coal-bed gas two-dimensional flow field method of testing Download PDFInfo
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Abstract
The invention discloses a kind of concordant hole pumping and mining coal-bed gas flow field detection method, concordant drilling both sides diverse location release search gas in the plane of coal seam, gas sample is gathered in extraction borehole, it is analyzed using gas-chromatography, it is determined that collecting the time of search gas, search gas point of release position under the identical time to sample is connected into curve, the deviation of time or position is determined using neighbor point interpolation value method, it is search gas point of release extraction impact position isogram under certain extraction time to draw Hypothesis of Single Curve Build Up, isogram under the different extraction times is concordant hole pumping and mining coal-bed gas flow field figure；Wherein it is determined that the search gas release of position is carried out using the method for multigroup drilling packet test, every group of arrangement 2 discharges drilling and 1 extraction borehole, discharges 2 kinds of search gas.The principle of the invention is simple, can realize the direct measurement in concordant hole pumping and mining gas flow field.
Description
Technical field
The present invention relates to a kind of concordant hole pumping and mining coal-bed gas two-dimensional flow field method of testing, belong to Coal Mining Technology neck
Domain.
Background technology
Concordant hole pumping and mining coal-bed gas are to eliminate the main method that Coal Seam Outburst Hazard and gas resources are recycled
One of.It is the recovery of the extinction and gas resources for realizing exploitation section coal seam, during working face machine lane and air way are tunneled and two
After the insertion of lane, it is inclined to along direction to concordant drilling is played, while being inclined to along coal seam in working face air way along coal seam in working face machine lane
To concordant drilling is played under direction, it is arranged in parallel between each drilling, the spacing between drilling is according to the concordant hole pumping and mining gas radius of influence
It is determined that.It is generally believed that the single concordant drilling gas flow field that mash gas extraction is formed in coal seam, is approximate centered on drilling
Cylindrical region.With concordant drilling widely using in each colliery, after occurring in that hole pumping and mining for a period of time, single hole gas density
Decline comparatively fast with the time with extraction amount, after taking various sealing of hole measures, effect is often improved not substantially, and such case does not meet suitable
Layer hole pumping and mining gas flow field is the imagination of cylindrical region.
To understand single concordant drilling surrounding Gas-Flow format of field, so as to be arrangement concordant drilling, efficient extraction watt is realized
This provides foundation, it is necessary to which drilling surrounding gas flow field is studied.At present, the determination to drilling surrounding gas flow field is main
Using numerical computation method；Scene determines that drilling surrounding gas flow field is by testing around extraction borehole gas in certain limit
The method of pressure or flow determines, also uses tracer gas technique, these methods be drilling radial direction away from drill center not
Measuring point test extraction influence point is arranged at same distance, is only the extraction influence radially one-dimensional zone of influence.To borehole axial direction or
Say that the gas flow field in coal seam plane where concordant drilling there is no direct method of testing.
The content of the invention
It is an object of the invention to provide a kind of concordant hole pumping and mining coal-bed gas two-dimensional flow field method of testing, it is adaptable to coal
Drilling surrounding gas flow field is determined under mine.
To reach the purpose, the technical method that the present invention takes is：
A kind of concordant hole pumping and mining coal-bed gas flow field two dimension method of testing, it is characterised in that：
Along 90 degree of azimuths of lane side, multigroup drilling is arranged in parallel coal seam in coal seam, every group three, wherein in the middle of to take out
Borehole, both sides are testing bore holes；
Pre-buried high pressure release hose to bottom hole, in the range of bottom hole 0.3m bore by seal orifice in two testing bore holes
Hole, air chamber is formed in bottom hole；
Extraction borehole presses concordant hole pumping and mining gas mode and parameter sealing of hole；
Using high-pressure hose, search gas is discharged to the air chamber constant-pressure stable of testing bore holes；
Extraction borehole carries out continuous extraction with certain negative pressure, while gathering the gas sample of extraction at regular intervals；
The gas sample gathered using chromatography, draws the relation curve of trace gas concentration and time.With search gas most
The high concentration value corresponding time has influence on the time of the location point as hole pumping and mining, is defined as the sample time.Where drilling
On the two dimensional surface of coal seam, the search gas point of release position under the identical time to sample is connected into curve, time or position it is inclined
Difference is determined using neighbor point interpolation value method.The Hypothesis of Single Curve Build Up of drafting is search gas point of release extraction influence position under certain extraction time
Isogram is put, the isogram under the different extraction times is concordant hole pumping and mining coal-bed gas flow field figure.
The method have the characteristics that：
The present invention arranges multiple measuring points with extraction borehole periphery, and influence time of each measuring point by extraction is tested respectively, utilizes
Interpolation method obtains borehole circumference extraction influence area isogram, draws flow field, so as to be the arrangement of gas pumping concordant drilling
And its investigation of sealing of hole effect provides on-the-spot test method.
Brief description of the drawings
Fig. 1 is that single group testing bore holes arrange schematic diagram.
Label in figure：1-testing bore holes sealing of hole, 2-search gas air chamber, 3-search gas release pipe, 4-coal seam,
5-drainage tube, 6-extraction borehole sealing of hole, 7,8-search gas release device.
Specific embodiment
Embodiment
Refering to Fig. 1, tested with by following program.
A kind of concordant hole pumping and mining coal-bed gas flow field detection method, comprises the following steps：
(1) along 90 degree of azimuths of lane side, parallel coal seam, the 1st group of drilling of being constructed in coal seam, three altogether, wherein in the middle of
It is extraction borehole, both sides are testing bore holes, and instrument connection is L6, each parameter reference table 1 apart from extraction pitch of holes；
The test parameter step scheme of table 1
(2) in two testing bore holes pre-buried high pressure release hose to bottom hole, seal orifice is to being L2 positions away from bottom hole
Scope internal drilling, sealed borehole length is respectively L1 and L5, and air chamber is formed in bottom hole；
(3) after placing drainage tube in extraction borehole, sealing of hole, sealed borehole length is L3；
(4) two kinds of different search gas are discharged to two air chamber constant-pressure stables of testing bore holes respectively；
(5) extraction borehole carries out continuous extraction with certain negative pressure, while gathering the gas sample of extraction at regular intervals, and remembers
Record collecting location and acquisition time；
(6) by the parameter of table 1, construct the 2nd, 3,4 groups respectively, repeat above-mentioned (1)~(5) step；
(7) using the gas sample of chromatography collection, the relation curve of trace gas concentration and time is drawn.With search gas
The maximum concentration value corresponding time has influence on the time of the location point as hole pumping and mining, is defined as the sample time；
(8) on coal seam two dimensional surface where drilling, by the search gas point of release position connection under the identical time to sample
Into curve, the deviation of time or position is determined using neighbor point interpolation value method, and the Hypothesis of Single Curve Build Up of drafting is that certain extraction time is shown below
Track gas point of release extraction impact position isogram, the isogram under the different extraction times is concordant hole pumping and mining coal seam
Gas flow field figure.
The above, is only explanation example of the invention, and not any limitation of the invention, every according to skill of the present invention
Any simple modification, change that art is substantially made to above-mentioned example, still belong in the protection domain of technical solution of the present invention.
Claims (1)
1. a kind of concordant hole pumping and mining coal-bed gas two-dimensional flow field method of testing, it is characterised in that：The concordant drilling two in coal seam
Side diverse location release search gas, concordant drilling and sealing extraction gas is gathered the gas sample of extraction, is divided using gas-chromatography
Analysis, it is determined that collecting the time of search gas, curve is connected into by the search gas point of release position under the identical time to sample, is obtained
Extraction impact position isogram under certain extraction time is obtained, the isogram under the drafting different extraction times is concordant drilling and takes out
Mining coal seam gas flow field figure；Specific method is comprised the following steps：
(1) along 90 degree of azimuths of lane side, parallel coal seam, the 1st group of drilling of being constructed in coal seam, three altogether, wherein middle is to take out
Borehole, both sides are testing bore holes, and instrument connection is L6 apart from extraction pitch of holes；
(2) in two testing bore holes pre-buried high pressure release hose to bottom hole, seal orifice is sealed to away from the drilling that bottom hole is L2 places
Hole length is respectively L1 and L5, and air chamber is formed in bottom hole；
(3) sealing of hole after placing drainage tube in extraction borehole, sealed borehole length is L3；
(4) two kinds of different search gas are discharged to two air chamber constant-pressure stables of testing bore holes respectively；
(5) extraction borehole while gathering the gas sample of extraction at regular intervals, and is recorded locality with the continuous extraction of certain negative pressure
Point and acquisition time；
(6) change apart from L6, construct the 2nd, 3,4 groups respectively, repeat above-mentioned (1)~(5) step；
(7) using the gas sample of chromatography collection, the relation curve of trace gas concentration and time is drawn, with search gas highest
The concentration value corresponding time has influence on the time of the location point as hole pumping and mining, is defined as the sample time；
(8) on coal seam two dimensional surface where drilling, the search gas point of release position under the identical time to sample is connected into song
The deviation of line, time or position determines that the Hypothesis of Single Curve Build Up of drafting is extraction shadow under certain extraction time using neighbor point interpolation value method
Position isogram is rung, the isogram under the different extraction times is concordant hole pumping and mining coal-bed gas flow field figure.
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| CN105804787B (en) * | 2016-03-28 | 2019-03-05 | 西南石油大学 | The method of coal petrography cranny development height is covered on a kind of measurement stope working surface of coal mines |
| CN106150487B (en) * | 2016-06-30 | 2019-03-26 | 重庆大学 | Coal seam group mash gas extraction source and gas flowfield are distributed double tracer test methods |
| CN106761708B (en) * | 2017-01-20 | 2019-09-17 | 中国石油大学(北京) | A kind of water drive inter-well tracer test test interpretation method |
| CN109252889A (en) * | 2018-11-13 | 2019-01-22 | 煤科集团沈阳研究院有限公司 | A kind of device and method measuring goaf large diameter borehole extraction range |
| CN110644976A (en) * | 2019-10-15 | 2020-01-03 | 天津大港油田圣达科技有限公司 | Gas tracer monitoring technology in miscible flooding |
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| US6280000B1 (en) * | 1998-11-20 | 2001-08-28 | Joseph A. Zupanick | Method for production of gas from a coal seam using intersecting well bores |
| CN103134448B (en) * | 2013-01-29 | 2016-08-10 | 河南理工大学 | A kind of method of testing of drilling gas extraction effective radius |
| CN104763406A (en) * | 2015-01-29 | 2015-07-08 | 河南理工大学 | Method for measuring extraction influence radius based on bedding drilling gas emission characteristics |
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Inventor after: Qin Ruxiang Inventor after: Qiu Jinwei Inventor after: Dai Guanglong Inventor after: Yang Yingdi Inventor after: Tang Mingyun Inventor after: Zhou Liang Inventor after: Li Yaobin Inventor after: Zhang Chao Inventor before: Qin Ruxiang Inventor before: Dai Guanglong Inventor before: Yang Yingdi Inventor before: Tang Mingyun Inventor before: Zhou Liang Inventor before: Li Yaobin Inventor before: Zhang Chao |
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