CN105041370A - Two-dimensional flow field testing method applied to coal seam gas extraction by drilling boreholes down seam - Google Patents
Two-dimensional flow field testing method applied to coal seam gas extraction by drilling boreholes down seam Download PDFInfo
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Abstract
The invention discloses a flow field testing method applied to coal seam gas extraction by drilling boreholes down the seam. According to the method, tracer gas is released at different positions of the two sides of a borehole drilled down the seam in the plane of the coal seam, a gas sample is acquired in a gas drainage borehole, gas chromatography is conducted, the time when the tracer gas is acquired is determined, the tracer gas releasing points with the same sample obtaining time are connected into a curve, deviation in time or position is determined with the proximal point interpolation method, the single curve which is drawn is a tracer gas releasing point extraction influence position contour map under a certain extraction time point, and a contour map under different extraction time points is a flow field chart for coal seam gas extraction by drilling boreholes down the seam. Tracer gas is released at the determined positions in the mode that multiple groups of boreholes are tested group by group, and each group includes two release boreholes and one gas drainage borehole and releases two kinds of tracer gas. The principle is simple, and direct measurement of the flow field generated during coal seam gas extraction by drilling boreholes down the seam can be achieved.
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 field.
Background technology
Concordant hole pumping and mining coal-bed gas is one of main method eliminating Coal Seam Outburst Hazard and gas resources recycling.For realizing the exploitation extinction in section coal seam and the recovery of gas resources, work plane machine lane and air way driving during and two lanes through after, hole to beating concordant along on tendency direction, coal seam in work plane machine lane, hole downwardly towards beating concordant along coal seam tendency side at work plane air way simultaneously, be arranged in parallel between each boring, the spacing between boring is determined according to the concordant hole pumping and mining gas radius of influence.It is generally acknowledged, the single concordant boring gas flow field that mash gas extraction is formed in coal seam is the approximate circle columnar region centered by holing.Along with concordant boring widely using in each colliery, after having there is hole pumping and mining a period of time, single hole gas density and extraction amount decline comparatively fast in time, after taking multiple sealing of hole measure, effect often improves not obvious, and it is the imagination of cylindrical region that this situation does not meet concordant hole pumping and mining gas flow field.
For understanding single concordant boring Gas-Flow format of field around, thus for arranging concordant boring, realizing efficient mash gas extraction and foundation is provided, be necessary around to study in gas flow field boring.At present, mainly numerical computation method is adopted to the determination in gas flow field around boring; Scene determines that around boring, gas flow field is determined by the method for gas pressure or flow in certain limit around test extraction borehole, also employing tracer gas technique is had, these methods arrange measuring point test extraction Influential cases in boring radial direction apart from drill center different distance place, is only that extraction affects radial one dimension influence area.Direct method of testing be there is no to the gas flow field in the plane of the coal seam, place of concordant boring in other words, borehole axial direction.
Summary of the invention
The object of the present invention is to provide a kind of concordant hole pumping and mining coal-bed gas two-dimensional flow field method of testing, be applicable to underground coal mine and determine boring gas flow field around.
For reaching this object, 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, is characterized in that:
Along lane side 90 degree of azimuths, parallel coal seam, arranges in coal seam and organizes boring more, often organize three, be extraction borehole wherein, both sides are testing bore holes;
In two testing bore holes at the bottom of pre-buried high pressure release hose to hole, seal orifice, to 0.3m scope internal drilling at the bottom of hole, forms air chamber at the bottom of hole;
Extraction borehole is by concordant hole pumping and mining gas mode and parameter sealing of hole;
Utilize high-pressure hose, to the air chamber constant-pressure stable release search gas of testing bore holes;
Extraction borehole carries out continuous extraction with certain negative pressure, gathers the gas sample of extraction at set intervals simultaneously;
The gas sample utilizing chromatography to gather, draws trace gas concentration and the relation curve of time.Have influence on the time of this location point using time corresponding to search gas maximum concentration value as hole pumping and mining, be defined as the sample time.On the two dimensional surface of boring coal seam, place, connect into curve by identical to the search gas point of release position under the sample time, the deviation of time or position adopts neighbor point interpolation value method to determine.The Hypothesis of Single Curve Build Up drawn is search gas point of release extraction impact position isogram under certain extraction time, and the isogram under the different extraction time is concordant hole pumping and mining coal-bed gas flow field figure.
Feature of the present invention is:
The present invention is with the multiple measuring point of extraction borehole periphery, test the influence time of each measuring point by extraction respectively, interpolation method is utilized to obtain borehole circumference extraction influence area isogram, draw flow field, thus the layout of holing for gas pumping concordant and the investigation of sealing of hole effect thereof provide on-the-spot test method.
Accompanying drawing explanation
Fig. 1 is that single group testing bore holes arranges schematic diagram.
Number in the figure: 1-testing bore holes sealing of hole, 2-search gas air chamber, 3-search gas releasing tube, 4-coal seam, 5-drainage tube, 6-extraction borehole sealing of hole, 7,8-search gas releasing device.
Detailed description of the invention
Embodiment
Consult Fig. 1, to test by following program.
A kind of concordant hole pumping and mining coal-bed gas flow field detection method, comprises the following steps:
(1) along lane side 90 degree of azimuths, parallel coal seam, the 1st group of boring of constructing in coal seam, amount to three, be extraction borehole wherein, both sides are testing bore holes, and instrument connection distance drainage holes spacing is L6, each parameter reference table 1;
Table 1 test parameter step scheme
(2) in two testing bore holes at the bottom of pre-buried high pressure release hose to hole, seal orifice is to the scope internal drilling apart from Di WeiL2 position, hole, and sealed borehole length is L1, at the bottom of hole, form air chamber;
(3) after placing extraction borehole in extraction borehole, sealing of hole, sealed borehole length is L3;
(4) two kinds of different search gas are discharged respectively to the air chamber constant-pressure stable of two testing bore holes;
(5) extraction borehole carries out continuous extraction with certain negative pressure, gathers the gas sample of extraction simultaneously at set intervals, and records collecting location and acquisition time;
(6) by table 1 parameter, construct the 2nd, 3,4 group respectively, repeat above-mentioned (1) ~ (5) step;
(7) the gas sample utilizing chromatography to gather, draws trace gas concentration and the relation curve of time.Have influence on the time of this location point using time corresponding to search gas maximum concentration value as hole pumping and mining, be defined as the sample time;
(8) on the two dimensional surface of boring coal seam, place, curve is connected into the search gas point of release position under the sample time by identical, the deviation of time or position adopts neighbor point interpolation value method to determine, the Hypothesis of Single Curve Build Up drawn is search gas point of release extraction impact position isogram under certain extraction time, and the isogram under the different extraction time is concordant hole pumping and mining coal-bed gas flow field figure.
The above is only illustrated example of the present invention, not any limitation of the invention, every above-mentioned example is done according to the technology of the present invention essence any simple modification, change, all still belong in the protection domain of technical solution of the present invention.
Claims (1)
1. a concordant hole pumping and mining coal-bed gas two-dimensional flow field method of testing, it is characterized in that: concordant boring both sides diverse location release search gas in coal seam, concordant drilling and sealing extraction gas, gather the gas sample of extraction, utilize gas-chromatography analysis, determine the time collecting search gas, curve is connected into the search gas point of release position under the sample time by identical, obtain extraction impact position isogram under certain extraction time, the isogram drawn under the different extraction time is concordant hole pumping and mining coal-bed gas flow field figure; Concrete grammar comprises the following steps:
(1) along lane side 90 degree of azimuths, parallel coal seam, the 1st group of boring of constructing in coal seam, amount to three, be extraction borehole wherein, both sides are testing bore holes, and instrument connection distance drainage holes spacing is L6;
(2) in two testing bore holes at the bottom of pre-buried high pressure release hose to hole, seal orifice is to the boring being L2 place at the bottom of hole, and sealed borehole length is L1, formation air chamber at the bottom of hole;
(3) in extraction borehole, place sealing of hole after drainage tube, sealed borehole length is L3;
(4) two kinds of different search gas are discharged respectively to the air chamber constant-pressure stable of two testing bore holes;
(5) extraction borehole is with the continuous extraction of certain negative pressure, gathers the gas sample of extraction simultaneously at set intervals, and records collecting location and acquisition time;
(6) construct the 2nd, 3,4 group respectively, repeat above-mentioned (2) ~ (5) step;
(7) the gas sample utilizing chromatography to gather, draws trace gas concentration and the relation curve of time, has influence on the time of this location point, be defined as the sample time using time corresponding to search gas maximum concentration value as hole pumping and mining;
(8) on the two dimensional surface of boring coal seam, place, curve is connected into the search gas point of release position under the sample time by identical, the deviation of time or position adopts neighbor point interpolation value method to determine, the Hypothesis of Single Curve Build Up drawn is extraction impact position isogram under certain extraction time, and the isogram under the different extraction time is concordant hole pumping and mining coal-bed gas flow field figure.
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Cited By (5)
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| CN105804787A (en) * | 2016-03-28 | 2016-07-27 | 西南石油大学 | Method for measuring fracture development height of coal covering rock on stope face of coal mine |
| CN106150487A (en) * | 2016-06-30 | 2016-11-23 | 重庆大学 | Coal seam group mash gas extraction source and gas flowfield distribution SHUANGSHI track test method |
| CN106761708A (en) * | 2017-01-20 | 2017-05-31 | 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105804787A (en) * | 2016-03-28 | 2016-07-27 | 西南石油大学 | Method for measuring fracture development height of coal covering rock on stope face of coal mine |
| 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 |
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| CN106761708A (en) * | 2017-01-20 | 2017-05-31 | 中国石油大学(北京) | A kind of water drive inter-well tracer test test interpretation method |
| 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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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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