CN102251799B - Method for selecting high-level gas drainage horizon in coal mine - Google Patents
Method for selecting high-level gas drainage horizon in coal mine Download PDFInfo
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- CN102251799B CN102251799B CN 201110181487 CN201110181487A CN102251799B CN 102251799 B CN102251799 B CN 102251799B CN 201110181487 CN201110181487 CN 201110181487 CN 201110181487 A CN201110181487 A CN 201110181487A CN 102251799 B CN102251799 B CN 102251799B
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Abstract
The invention relates to a method for selecting a high-level gas drainage horizon in a coal mine. When the horizon of a drainage borehole is too high, the mining-induced fracture does not develop, the drainage is difficult to operate and the efficiency is low; when the horizon is too low, the air leakage on a working face occurs easily, the operation of a ventilation system of the mine is affected, the stability of a rock formation is poor, the borehole is difficult to maintain and the drainage efficiency is difficult to ensure. The method comprises the following steps: designing the positions, the parameters and the number of detection boreholes according to underground conditions, then constructing a pre-drainage contrast hole and the detection holes, immediately performing water-leakage detection after completing the construction, recording detection data, further performing preliminary analysis on the detection data, standardizing the detection data by taking the vertical height as the standard, contrasting the data of the pre-drainage contrast hole and the detection holes, measuring the development degree of the mining-induced fracture according to the changing degree of water leakage quantity and determining the optimal gas drainage horizon according to the rock character of the positions. By adopting the method, the hole arrangement precision is increased and the hole-forming rate of the boreholes is improved; the gas drainage of a coal seam is benefited and the impacts on the ventilation system of the mine are reduced; and the drainage cost is reduced and the economic efficiency is improved.
Description
Technical field
The present invention relates to gas safety improvement technology, be specifically related to a kind of system of selection that utilizes boring subsection water injection, the technology of leaking hunting to carry out the high-order extraction layer of coal mine gas position.
Technical background
Coal mine gas is one of the great disaster in colliery, and gas pumping is the measure that effects a permanent cure that solves the coal mine gas disaster.Since country promulgated the control of coalmine gas policy, the gas pumping technology was growing.Particularly adopt roof strata to move towards horizontal long drilled holes extraction adjacent layer and goaf gas, this economically viable new technology exceeds standard for alleviation coal-bed gas improvement pressure, raising gas pumping efficient, reduction gas bearing capacity, has played positive effect.And the problem that seriously limits this technology large-scale promotion at present is the layer position, reasonable cloth hole of extraction borehole, because the layer position that extraction borehole is arranged is too high, and the mining induced fissure agensis, the extraction difficulty is big, and efficient is low; The layer position that extraction borehole is arranged is low excessively, easily causes work plane seriously to divulge a secret, and influence mine ventilation system and run well, the time-parallel strata poor stability, it is difficult in maintenance hole, effective extraction time weak point, even can't pore-forming, extraction efficient is difficult to assurance.Therefore, carry out choose reasonable for the layer position of arranging the top board extraction borehole and be very important, directly affect the effect of hole pumping and mining gas.
Efficient for the high-order boring of maximum performance gas pumping, must improve Kong Weixuan accuracy and the precision of high-order boring, at present commonly used rule of thumb or there is the cost height in the test means selecting to arrange high-order mash gas pumping drilling, blindness is big and problem such as unreliable.
Summary of the invention
The system of selection that technical problem to be solved by this invention provides the high-order extraction layer of a kind of coal mine gas position can improve the reasonability of the layer position of arranging the boring of top board exhausting, improves the gas pumping effect, reduces the gas pumping cost.
For solving above-mentioned technical problem, the technical scheme that the present invention takes:
Compared with prior art, the present invention originally can improve present situation at high-order gas pumping cloth hole blindness, inefficiency, increases cloth hole precision, improves the Completion of Drilling Hole rate; Be conducive to the coal-bed gas extraction, reduce the influence to mine ventilation system; Reduce the extraction cost, improve business efficiency.
The specific embodiment
Below the present invention is described in detail.
The present invention realizes by following steps:
The first step: according to according to conditions down-hole, bore position, parameter and quantity thereof are surveyed in design, main consideration is selected suitable position construction to survey according to conditions down-hole and is bored nest, general chosen distance back production finishes about 6 months goaf, back as detected object, to guarantee simultaneously can survey at same brill nest that work on regular shifts in the coal seam that is not subjected to mining influence and the original water permeable ability of overlying rock, assurance has time enough to finish drilling construction and detection mission, guarantees to have to finish the required rig of detection mission, electric power, hydraulic pressure and space; According to the performance of the position of boring nest, rig and need the distance and bearing design of the detection of a target to survey aperture, length, orientation and the elevation angle in boring and contrast hole, generally speaking, all borings are all with to adopt sky working face extraction direction vertical, to reduce the boring workload, boring length need surpass the mining induced fissure band scope with the empirical formula prediction, guaranteeing to pass under the situation of water flowing fractured zone, designing the bigger boring elevation angle as far as possible, less boring workload and assurance are surveyed without hindrance; 2 borings of general minimum design, one adopt the back exploration hole, one adopt before the contrast hole, satisfy to survey and the contrast needs, should design simultaneously two other at the inclination angle respectively greater than with the standby back exploration hole of adopting less than first exploration hole, when first exploration hole can not meet the demands, select to use.Note, generally design the elevation angle of all borings less than 70 degree.
Suitable position refers to that a side is the goaf that back production finished 1-12 month, and a side is the work plane (exploiting field) of not back production, and the down-hole rig can arrive, and possesses the required water, electricity, gas condition of drilling construction;
Second step: contrast hole before construction is adopted, carry out water-leaking property after finishing immediately and detect and recording detection data, the main unstability of considering boring, for the boring of failing in time to survey, must be before detection through hole, guarantee in the hole accessible, adopt roll-back method during detection, data must accurate recording.
The 3rd step: the construction exploration hole, carry out water-leaking property immediately after construction is finished and detect and recording detection data, mainly consider the unstability of minery boring.For the boring of failing in time to survey, must be before detection through hole, guarantee in the hole accessiblely, adopt roll-back method during detection, accurate recording detection data.
The 4th step: initial analysis detects data, judge whether to reach testing goal, do not reach and then repeated for the 3rd step, otherwise enter next step, the main excursion of considering exploration hole detection data, if have the long obviously section of leaking 〉=3 meter with the contrast boring ratio, need to consider to increase the elevation angle repeat to construct exploration hole and detecting and record data, and then whether consideration entered for the 5th step; If with the contrast boring ratio more obvious section of leaking, then consider to reduce construct again exploration hole and detecting and record data of the elevation angle; If have the short obviously section of leaking＜3 meter with the contrast boring ratio, then can enter next step.
Obviously the section of leaking refers to that certain sensing point adopts the back water leakage and exceed and adopt 10% of preceding hole correspondence position water leakage, and this point is exactly obvious leakage point, and obviously the section of leaking refers to the hole section of obvious leakage point continuous more than 2.
The 5th step: be standard criterion detection data with the vertical height, contrast hole and exploration hole data before contrast is adopted, weigh the mining induced fissure development degree with the water leakage intensity of variation, main consideration is the unified data that detect in vertical direction, with the foundation of relative water leakage as the mining induced fissure development degree, the more big explanation mining induced fissure of water leakage is educated all the more relatively.Owing to survey boring and contrast the hole certain inclination angle is arranged, the data of surveying can not be used for directly contrasting, so at first the survey data must be converted on the vertical distance of measuring point apart from basic point by hole depth, the general selection laid the platform end face of rig as basic point, the development degree of weighing mining induced fissure with relative water leakage can be avoided the false appearance of leaking that causes because of lithology, and the pass of cranny development degree and water leakage is qualitative relationships here.
The 6th step: determine best high-order gas pumping interval with reference to the mining induced fissure development height that the lithology of particular location, caving zone height and the 5th step obtain, this interval be caving zone above to the mining induced fissure development height with all interior rock stratum sections, in this interval, select the hard formation of close caving zone (as sandstone etc.) as the sheaf of ideal position.
The present invention is according to the leak hunting functional exploitation of technology of former subsection water injection, segmentation, quick, high accuracy and the low advantage of cost by former technology, for colliery high-order gas drainage under suction cloth hole choosing layer provides direct foundation, make high-order gas drainage under suction more efficient, blindness and the extraction cost in the cloth hole that reduces when improving drainage efficient.This method is practical, and principle is simple, is easy to grasp and utilize.
Claims (1)
1. the system of selection of the high-order extraction layer of coal mine gas position is characterized in that: realize by following steps:
The first step: according to conditions down-hole, bore position, parameter and quantity thereof are surveyed in design: select suitable position construction to survey according to conditions down-hole and bore nest, the chosen distance back production finishes 6-12 month goaf, back as detected object, 2 borings of minimum design, one adopt the back exploration hole, one adopt before the contrast hole, design simultaneously two other inclination angle respectively greater than with adopt less than first the back exploration hole standby adopt the back exploration hole, the elevation angle of all borings less than 70 the degree;
Second step: contrast hole before construction is adopted, carry out water-leaking property after finishing immediately and detect and recording detection data;
The 3rd step: the back exploration hole is adopted in construction, carries out water-leaking property immediately after construction is finished and detects and recording detection data;
The 4th step: initial analysis detects data, judge whether to reach testing goal, adopt the excursion of back exploration hole detection data, if with adopt before the contrast boring ratio have the obviously section of leaking, and the segment length of leaking 〉=3 meter, then the elevation angle of increase boring is repeated construction and is adopted back exploration hole and detection and record data, detects again again; If with adopt before the contrast boring ratio more obvious section of leaking, constructing again and adopt the back exploration hole and detect and record data in the elevation angle that then reduces boring, detects again again; If with adopt before the contrast boring ratio have the short obviously section of leaking, and the segment length of leaking＜3 meter then can enter next step;
The 5th step: be standard criterion detection data with the vertical height, contrast the hole before contrast is adopted and adopt back exploration hole data, weigh the mining induced fissure development degree with the water leakage intensity of variation: adopting the back exploration hole and adopting preceding contrast hole has certain inclination angle, the data of surveying can not be used for directly contrasting, at first the survey data are converted on the vertical distance of measuring point apart from basic point by hole depth, selection is laid the platform end face of rig as basic point, with the development degree of relative water leakage measurement mining induced fissure, the more big explanation mining induced fissure of water leakage is educated all the more relatively;
The 6th step: determine best high-order gas pumping interval with reference to the mining induced fissure development degree that the lithology of particular location, caving zone height and the 5th step obtain, this interval be caving zone above to the mining induced fissure development height with all interior rock stratum sections, in this interval, select the hard formation of the most close caving zone as the sheaf of ideal position.
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| CN104564126A (en) * | 2014-12-30 | 2015-04-29 | 徐州恒安煤矿技术有限公司 | Method and device for detecting arrangement position of highly collection tunnel |
| CN111255509B (en) * | 2020-03-26 | 2021-05-11 | 辽宁工程技术大学 | Device and method for determining position of overburden gas rock stratum |
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| US4471840A (en) * | 1983-06-23 | 1984-09-18 | Lasseter Paul A | Method of coal degasification |
| US4978172A (en) * | 1989-10-26 | 1990-12-18 | Resource Enterprises, Inc. | Gob methane drainage system |
| US6497457B1 (en) * | 2001-05-31 | 2002-12-24 | Larry G. Stolarczyk | Drilling, image, and coal-bed methane production ahead of mining |
| CN100356036C (en) * | 2003-03-18 | 2007-12-19 | 淮南矿业(集团)有限责任公司 | Method for pumping out gas from mining coal layer roof |
| CN100356037C (en) * | 2003-03-28 | 2007-12-19 | 淮南矿业(集团)有限责任公司 | Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method |
| US7445045B2 (en) * | 2003-12-04 | 2008-11-04 | Halliburton Energy Services, Inc. | Method of optimizing production of gas from vertical wells in coal seams |
| CN1563664B (en) * | 2004-03-29 | 2010-04-28 | 柴兆喜 | Well of coal-bed gas |
| RU2256079C1 (en) * | 2004-04-05 | 2005-07-10 | Государственное образовательное учреждение высшего профессионального образования Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет) | Method for extracting methane from coal bed |
| CN1313702C (en) * | 2005-06-02 | 2007-05-02 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
| CN102003201B (en) * | 2010-12-21 | 2013-01-02 | 山西晋城无烟煤矿业集团有限责任公司 | Gas drainage method in gob of coal mine |
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Address after: 710075 Xi'an high tech Industrial Development Zone, Shaanxi, Jin Jin Road, No. 82 Patentee after: Xi'an Research Institute, CCTEG Address before: 710075 Xi'an high tech Industrial Development Zone, Shaanxi, Jin Jin Road, No. 82 Patentee before: China Coal Technology & Engineering Group Xi'an Research Institute |