CN110645040A - Outburst coal seam 'Wuding' gas treatment method based on directional drilling machine - Google Patents

Outburst coal seam 'Wuding' gas treatment method based on directional drilling machine Download PDF

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Publication number
CN110645040A
CN110645040A CN201911061409.3A CN201911061409A CN110645040A CN 110645040 A CN110645040 A CN 110645040A CN 201911061409 A CN201911061409 A CN 201911061409A CN 110645040 A CN110645040 A CN 110645040A
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gas
coal seam
extraction
hole
coal
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Inventor
陶云奇
马识杰
马耕
张鹏伟
王晨辉
成晋军
周正涛
张冰
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Zhengzhou Huikuang Intelligent Technology Co Ltd
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Zhengzhou Huikuang Intelligent Technology Co Ltd
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Priority to CN201911061409.3A priority Critical patent/CN110645040A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/006Production of coal-bed methane
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/261Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08Obtaining fluid samples or testing fluids, in boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/087Well testing, e.g. testing for reservoir productivity or formation parameters
    • E21B49/088Well testing, e.g. testing for reservoir productivity or formation parameters combined with sampling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling

Abstract

The invention provides a method for treating gas in a outburst coal seam by using 'Wuding' gas based on a directional drilling machine, which comprises the following steps: firstly, evaluating the feasibility of adopting a 'five-set' gas treatment method for each extraction geological unit; the method comprises the following steps of firstly, carrying out directional drilling on an extraction geological unit, secondly, carrying out positioning disturbance in an anti-reflection hole, carrying out anti-reflection on a coal seam, thirdly, carrying out hole sealing on the anti-reflection hole and the extraction hole, fifthly, carrying out gas parameter measurement on fixed-point closed sampling, and facilitating rapid extraction of gas, wherein the gas concentration and flow on an extraction pipeline are monitored in real time through a gas extraction online monitoring system, and then the gas extraction quantity and the gas quantity to be extracted in a region are counted and displayed in real time in a cloud picture mode on a display through system calculation, so that the extraction time of drill holes can be accurately controlled, the gas extraction quantity and the gas participation content of each drill hole or hole group are displayed in cloud pictures with different colors, and the extraction effect is more visually reflected.

Description

Outburst coal seam 'Wuding' gas treatment method based on directional drilling machine
Technical Field
The invention relates to the technical field of gas drainage in a coal mining process, in particular to a method for treating gas in a outburst coal seam through Wuding based on a directional drilling machine.
Background
Because of the characteristics of cleanness and no pollution after combustion, coal bed gas is encouraged to be developed and utilized as clean energy all the time, but for coal mine production, the gas is a major hazard source threatening safety production, how to stop gas accidents, and realizing the safe development and utilization of the gas is a subject which is always explored by mine technicians.
As most of coal mines in China are outburst mines, most of local coal monitoring departments require that coal seam floor rock roadways must be excavated in advance before outburst mine stoping, a large number of high-density cross-layer drill holes are constructed in the floor rock roadways, and coal seam gas is pre-pumped to reach the standard before coal seam heading and working face stoping work can be carried out, and after the working face stoping is finished, the floor rock roadways and the cross-layer drill holes become invalid roadways and drill holes, so that a large amount of waste is caused. For the extraction of a mining area with a short working face, a rock tunnel is generally constructed in a stable rock stratum of a bottom plate 8-15 m below a machine tunnel and an air tunnel, a large number of high-density cross-layer drill holes are constructed in the rock tunnel to an overlying coal layer to cover the overlying coal layer for gas pre-extraction work, and the extraction operation can be carried out only after the extraction reaches the standard, and the operation method has the following problems:
the digging rock roadway has large project amount, long time and high cost. Aiming at a stope face with a shorter working face, a bottom plate lane can be respectively constructed on the lower bottom plates of the air lane and the machine lane, and a cross-layer drill hole is constructed from the bottom pumping lane to the overlying coal layer to cover the coal layer in the length of the whole stope face; with the improvement of coal mine equipment and technology, when the stope face is long, for example, greater than 150m, the coverage of the cross-layer drill holes is limited, the cross-layer drill holes in the two bottom pumping roadways are difficult to cover the coal seam of the whole stope face, and a third bottom roadway is generally constructed under the bottom plate in the middle of the stope face to completely cover the coal seam of the stope face, so that the construction workload is increased.
According to the requirements of the regulations for preventing and controlling coal and gas outburst, gas pre-pumping is generally carried out on the outburst coal seam aiming at the gas control of the outburst coal seam, and the tunneling and the stoping operation can be carried out only when the gas content and the pressure in the coal seam are reduced to be below the specified values. The pre-pumping of the coal seam gas refers to that a large number of bedding or crossing holes are drilled in the coal seam, and after holes are formed, the holes are sealed and the network is connected to pump the gas in a negative pressure mode, so that the gas content of the coal seam is reduced.
The extraction drilling track of the conventional drilling machine is uncontrollable, the actual track of the conventional drilling machine is deviated from the designed drilling track, the designed drilling hole completely covers the target coal seam, however, due to the deviation of the actual drilling hole, a blank zone which cannot be covered by the extraction drilling hole often exists in the extracted coal seam, due to the fact that gas pre-extraction is not carried out on the blank zone, the gas content and the gas pressure in the blank zone are still high, and safety accidents such as gas outburst and the like can still occur when the coal seam is stoped or tunneled to the blank zone.
The gas extraction flow and concentration of the coal bed with low gas permeability are low, and the effect is poor; according to statistics, more than 95 percent of coal seams mined by high gas and outburst mines in China belong to low-permeability coal seams, and the permeability is more than 10-3~10-4The mD order of magnitude, gas in the coal seam is difficult to analyze, move and flow due to poor air permeability during extraction, the influence range of gas extraction (especially pre-extraction) is small, the attenuation speed is high, the extraction difficulty is large, and the situation of 'gas extraction cannot be realized'.
The conventional drilling technology for pre-pumping coal seam gas by floor drainage roadway cross drilling has large drilling engineering quantity. When the coal seam gas is pre-pumped through the cross-layer drilling, the effective hole section of the cross-layer drilling hole occupies a small length ratio of the whole drilling hole, the number of the required cross-layer drilling holes is large, the density is large, the coal hole section occupies a small ratio, the construction engineering amount of the drilling hole is large, the investment is high, the bottom plate rock roadway needs to be dug firstly, the engineering amount is large, the construction period is long, and the investment of manpower, material resources and financial resources is large.
And the coal bed gas content test is inaccurate. The method for measuring the coal seam gas content comprises a plurality of methods, commonly used are an orifice powder receiving method and a coring method, the orifice powder receiving method is that drill cuttings discharged along the annular space between a drill rod and a drill hole wall at the bottom of a hole in the process of receiving and applying the drill at a drill hole opening are filled into a coal sample tank to be sealed, the drill cuttings are sent to a laboratory for gas content test after field desorption, and when the drill hole is too deep (for example, more than 60 m), the error of the measured and calculated gas content is large due to the fact that a large amount of gas is scattered in the process of discharging the drill hole by the drill cuttings, and the condition of the gas existing in the coal seam cannot be. The core-taking method is that a sampler is put into a drill hole, a core-taking cylinder on the sampler is matched with a drill bit to load a coal sample into the core-taking cylinder, but the general sampler is open, and the core-taking cylinder is filled into the hole wall to drop slag in the process of putting the sampler into the drill hole, so that the core-taking effect is influenced; after coring, the coal sample is in an exposed state in the process of withdrawing the drill, the exposure time of the coal sample for deep hole sampling is long, the gas loss is large, and the accuracy of a measuring result is influenced.
The evaluation method for the gas of the coal seam in the area is characterized in that the gas content of the coal seam in the area is measured by extracting individual point positions in the evaluation area, the gas content of the coal seam in the area is finally evaluated by integrating the gas content conditions of all the point positions, and when the gas content of the measured points meets the requirements, the gas content of the whole area is pre-extracted to reach the standard.
Disclosure of Invention
The invention aims to solve the technical problems of accurately detecting the content of gas, reducing the construction cost and preventing accidents, and provides a method for treating the gas in the outburst coal seam by using a directional drilling machine.
The object of the invention is achieved in the following way:
a protruding coal seam 'wuding' gas treatment method based on a directional drilling machine comprises the following steps:
firstly, collecting and collating geological exploration drilling data in a target area, dividing different extraction geological units and evaluating the feasibility of adopting a 'five-set' gas control method for each extraction geological unit;
secondly, directionally drilling the extraction geological unit with the feasibility of the 'five-fixed' gas treatment method in the first step, and for the soft coal seam with the firmness coefficient f of the coal seam being less than 0.5, selecting to arrange a main hole which is directionally drilled in a rock stratum at the top or the bottom of the coal seam, and constructing a branch hole from the inside of the main hole to the coal seam; for a hard coal seam with the coal seam firmness coefficient f being more than or equal to 0.5, directly arranging the directionally drilled main holes in the coal seam;
thirdly, if the coal bed has the air permeability coefficient of lambda<0.1m2/MPa2D, borehole flow attenuation coefficient α>0.05d-1Selecting a plurality of drill holes constructed in the second step as the permeability increasing holes, taking other drill holes as extraction holes for extracting coal bed gas, and performing positioning disturbance in the permeability increasing holes to increase the permeability of the coal bed; if the permeability coefficient of the coal seam is lambda>0.1m2/MPa2D, borehole flow attenuation coefficient α<0.05d-1The gas extraction is carried out after the directional drilling is directly carried out in the easily-extracted area without the permeability increase of the coal bed;
fourthly, hole sealing is carried out on the enhanced hole and the extraction hole, networking negative pressure extraction is carried out through an extraction pipeline after hole sealing, and a gas extraction online monitoring system for carrying out online monitoring and measurement on the gas extraction quantity, the residual gas content and the extraction dynamic state of drill holes or hole groups in different extraction geological units is arranged on the extraction pipeline;
fifthly, displaying that the residual gas content of all the drill holes or the drill hole groups reaches Q by the online monitoring system in the fourth step<8m3The extraction geological unit of/t carries out deep hole fixed point closed sampling to carry out gas parameter measurement, and the gas content and the gas pressure of a coal seam are measured;
sixthly, when the measurement results of all gas parameters in the extraction geological unit reach the coal seam gas content Q<8m3T, gas pressure P<When the pressure is 0.74MPa, evaluating the extraction geological unit as that the gas treatment judgment standard reaches, and repeating the second step to the fifth step after the encrypted drilling of the extraction geological unit with the measurement result not reaching the standard until the coal seam gas content and the gas pressure of all gas parameter measuring points in the extraction geological unit reach Q<8m3/t、P<And when the pressure is 0.74MPa, the gas treatment judgment of the extraction geological unit reaches the standard.
The directional drilling in the second step is drilling through a directional drilling machine or drilling through a track measuring device matched with a conventional drilling machine.
In a second step, the directionally drilled main bore is lined with a casing within a depth of about 10m from the bore opening.
In the second step, the diameter of the directional drilling hole is more than or equal to 98 mm.
In the fourth step, the online monitoring system comprises a gas drainage comprehensive parameter measuring instrument arranged on the drainage pipeline, the gas drainage comprehensive parameter measuring instrument is connected with a gas drainage monitoring system, the gas drainage monitoring system is arranged in the ground dispatching room, and the gas drainage quantity and the residual gas content of different drill holes or hole groups are displayed on the gas drainage monitoring system in different colors.
In the second step, for the soft coal seam with the firmness coefficient f of the coal seam less than 0.5, the main hole on the top plate or the bottom plate of the coal seam has a certain distance, generally 3-20m, from the coal seam, and the branch hole penetrates into the coal seam from the top plate or the bottom plate of the coal seam or extends along the coal seam for a distance of 30-50m, or penetrates into the coal seam from the top plate or the bottom plate of the coal seam and then directly penetrates into the bottom plate or the top plate of the coal seam.
In the fifth step, for gas control of the sectional coal seam, if the width of the section or the width of a stoping area does not exceed 120m, at least two test points are arranged at intervals of 30 ~ 50m in the advancing direction of the coal face, otherwise, at least three test points are arranged at intervals of 30 ~ 50m in the advancing direction of the coal face.
Compared with the prior art, the invention has the beneficial effects that:
1. by constructing directional drilling on a target coal seam, the drilling track is controllable, the drilling track is convenient to master, hole crossing is avoided, the deviation between the actual track of the directional drilling and the designed drilling is small, the designed control range can be completely covered by the constructed directional drilling, a blank zone is not left in gas extraction, and the gas outburst danger is reduced.
2. For the coal seam which is difficult to drain and has low air permeability, the permeability of the coal seam is increased by a positioning disturbance technology, so that cracks in the coal seam are further expanded and communicated, the air permeability of the coal seam is increased, and the gas can be conveniently and quickly pumped out.
3. The gas extraction on-line monitoring system monitors the gas concentration and flow on the extraction pipeline in real time, and then calculates and displays the gas extraction amount and the gas amount to be extracted in the area on the display in real time in a cloud picture mode through the system, so that the extraction progress is accurately controlled, and the preparation time of the working face is reduced.
4. The coal sample is drilled in the directional drilling hole through the deep hole fixed-point airtight sampling device, the accurate position of a sampling point can be determined according to a navigation system of a drilling machine, deep hole and fixed-point sampling is achieved, the result of the gas content of the coal seam is determined more accurately, when the gas content in the coal sample which is directly determined reaches the standard, gas control measures in the region are effective, and extraction standard reaching judgment is guaranteed to be reliable.
5. The method has the advantages that the gas extraction quantity of the drill holes or the hole groups is monitored in real time, the residual gas content of the coal layer in the control range of a single hole or the hole group can be indirectly calculated through measuring and calculating the original gas content of the coal layer, so that the extraction time of the drill holes can be accurately controlled, the gas content of all the drill holes in the extraction period can reach the standard, the gas extraction quantity and the participated gas content of each drill hole or hole group are displayed in cloud pictures with different colors, and the extraction effect can be more visually reflected.
Drawings
FIG. 1 is a schematic view of the directional drilling of the invention from an uphill roadway along the direction of a coal seam;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 when the coal seam is a hard coal seam;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1 when the coal seam is a soft coal seam and the branch bore extends in the coal seam;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 1, the coal seam being a soft coal seam and the branch bore penetrating the roof of the coal seam directly after entering the coal seam;
FIG. 5 is a schematic view of the invention for directional drilling along the coal seam direction from the upper and lower bottom drawing roadway;
FIG. 6 is a schematic view of the invention for directional drilling along the coal seam inclination from the upper and lower bottom drawing roadway;
fig. 7 is a schematic diagram of the directional drilling of the invention from the air and machine drifts along the coal seam trend.
The method comprises the following steps of 1 directional drilling, 2 cutting, 3 air tunnels, 4 main holes, 5 machine tunnels, 6 branch holes, 7 upper bottom pumping tunnels, 8 lower bottom pumping tunnels, B coal beds, C goafs and D rock uphill tunnels.
Detailed Description
As shown in fig. 1 to 7, a specific embodiment 1 of a method for treating gas in a protruding coal seam "wuding" based on a directional drilling machine comprises the following steps:
firstly, collecting and collating geological exploration drilling data in a target area, dividing different extraction geological units and evaluating the feasibility of adopting a 'five-set' gas control method for each extraction geological unit;
secondly, directionally drilling the extraction geological unit with the feasibility of the 'five-fixed' gas treatment method in the first step, and for the soft coal seam with the firmness coefficient f of the coal seam being less than 0.5, selecting to arrange a main hole 4 which is directionally drilled in a rock stratum at the top or the bottom of the coal seam, and constructing a branch hole 6 from the inside of the main hole 4 to the coal seam B; for a hard coal seam with the coal seam firmness coefficient f being more than or equal to 0.5, directly arranging the directionally drilled main hole 4 in the coal seam;
in the third step, the first step is,if the coal seam has permeability coefficient of lambda<0.1m2/MPa2D, borehole flow attenuation coefficient α>0.05d-1Selecting a plurality of drill holes constructed in the second step as the permeability increasing holes, taking other drill holes as extraction holes for extracting coal bed gas, and performing positioning disturbance in the permeability increasing holes to increase the permeability of the coal bed; if the permeability coefficient of the coal seam is lambda>0.1m2/MPa2D, borehole flow attenuation coefficient α<0.05d-1The gas extraction is carried out after the directional drilling is directly carried out in the easily-extracted area without the permeability increase of the coal bed;
fourthly, hole sealing is carried out on the enhanced hole and the extraction hole, networking negative pressure extraction is carried out through an extraction pipeline after hole sealing, and a gas extraction online monitoring system for carrying out online monitoring and measurement on the gas extraction quantity, the residual gas content and the extraction dynamic state of a single drill hole or a single drill hole group in different extraction geological units is arranged on the extraction pipeline;
fifthly, displaying that the residual gas content of all the drill holes or the drill hole groups reaches Q by the online monitoring system in the fourth step<8m3The extraction geological unit of/t carries out deep hole fixed point closed sampling to carry out gas parameter measurement, and the gas content and the gas pressure of a coal seam are measured;
sixthly, when the measurement results of all gas parameters in the extraction geological unit reach the coal seam gas content Q<8m3T, gas pressure P<When the pressure is 0.74MPa, evaluating the extraction geological unit as that the gas treatment judgment standard reaches, and repeating the second step to the fifth step after the encrypted drilling of the extraction geological unit with the measurement result not reaching the standard until the coal seam gas content and the gas pressure of all coal seam gas parameter measuring points in the extraction geological unit reach Q<8m3/t、P<And when the pressure is 0.74MPa, the gas treatment judgment of the extraction geological unit reaches the standard.
The directional drilling in the second step is drilling by a directional drilling machine or drilling by a track measuring device matched with a conventional drilling machine.
In the second step, the casing pipe is placed in the main hole 4 of the directional drilling within the depth range of about 10m from the hole opening, the casing pipe is made of glass fiber reinforced plastics or PVC materials, and the casing pipe is used for fixing the hole.
In the second step, the diameter of the directional drilling hole is more than or equal to 98 mm.
In the third step, the through holes are main holes 4 extending along the coal seam or the through holes are branch holes 6 sections of the main holes 4 in the coal seam on the top or bottom of the coal seam; fixed-point disturbance is carried out in the main hole 4 section or the branch hole 6 in the coal bed, so that cracks are directly generated in the coal bed, the cracks are conveniently generated in the coal bed, and the coal bed is increased in permeability.
In the third step, when the anti-reflection holes are subjected to anti-reflection coal seam positioning disturbance, the anti-reflection holes need to be washed by clean water before hole sealing; the hole sealing mode comprises hole sealing by a hole sealing device and hole sealing by grouting, and when the hole sealing by grouting is adopted, the hole sealing length is not less than 5 m.
In the third step, at least one extraction hole is arranged between the two adjacent enhanced holes; the enhanced holes and the extraction holes are arranged at intervals, fixed-point anti-reflection is carried out on the coal seam through fixed-point disturbance, the enhanced holes are communicated with the cracks of the extraction holes, the effective extraction radius of the extraction holes is increased, and the coal seam gas is continuously pre-extracted for a long time by utilizing the high concentration of the extraction holes, so that the gas area management is realized.
In the fourth step, the online monitoring system comprises a gas drainage comprehensive parameter measuring instrument arranged on the drainage pipeline, the gas drainage comprehensive parameter measuring instrument is connected with a gas drainage monitoring system, the gas drainage monitoring system is arranged in the ground dispatching room, and the gas drainage quantity and the residual gas content of different drill holes or hole groups are displayed on the gas drainage monitoring system in different colors.
In the second step, for the soft coal seam with the firmness factor f <0.5, the main hole 4 at the top plate or the bottom plate of the coal seam is at a certain distance, generally 3-20m, from the coal seam, and the branch hole 6 penetrates into the coal seam from the top plate or the bottom plate of the coal seam or extends along the coal seam for a distance of 30-50m, or penetrates into the coal seam from the top plate or the bottom plate of the coal seam and then directly penetrates into the bottom plate or the top plate of the coal seam.
In the fifth step, for gas control of the regional coal seam, if the width of the regional coal seam or the width of a stoping region does not exceed 120m, at least two test points are arranged at intervals of 30 ~ 50m along the advancing direction of the coal face, otherwise, at least three test points are arranged at intervals of 30 ~ 50m along the advancing direction of the coal face, a sampling point is positioned at an exploitation project part with the largest buried depth, each geological unit in the region is respectively measured, otherwise, the gas parameter of a certain unit cannot represent the parameters of other units due to large geological condition difference among the geological units, and meanwhile, a certain number of test points are arranged at different positions and buried depths in one geological unit so as to accurately master the gas parameter in the geological unit.
The specific structure of the deep hole fixed point closed sampler is referred to as CN201711373379.0, and is named as a Chinese patent document of a coal mine deep hole fixed point closed sampling device and a sampling method.
The working process of the invention is as follows: as shown in fig. 1, in the first step, geological exploration drilling data in an implementation area are collected and sorted, areas with the same coal quality and similar occurrence conditions of tiles, geological structure influence degree, lithology of a top floor and a bottom floor of a coal seam, continuity of the coal seam in the area and other coal seam occurrence conditions are divided into the same extraction geological unit, extraction geological fine analysis is carried out on the same extraction geological unit, and feasibility of adopting a 'five-definite' gas treatment technology is evaluated;
and secondly, constructing a directional drilling hole 1 from a rock roadway at the top of the mountain in the direction of the coal bed towards the direction of the cutting hole 2 in the extraction geological unit with the feasibility of a 'five-fixed' gas control method, and if the firmness coefficient f of the coal bed is less than 0.5 of a soft coal bed, selecting a stable rock stratum with the distance between the main hole 4 of the directional drilling hole 1 and the top/bottom of the coal bed being 3-20m, such as: the method comprises the following steps that (1) comb-shaped branch holes 6 are constructed in the coal seam from the inside of a main hole 4, the branch holes 6 extend for 30-50m in the coal seam after penetrating into the coal seam from the top/bottom of the coal seam, as shown in figure 3, or the branch holes 6 penetrate into the coal seam from the top or bottom of the coal seam and then directly penetrate into the bottom or top of the coal seam, as shown in figure 4; for a hard coal seam with the coal seam firmness coefficient f being more than 0.5, main holes 4 of directional drilling holes 1 are directly arranged in the coal seam and extend along the existing direction of the coal seam, as shown in fig. 2, the distance between the main holes 4 of the adjacent directional drilling holes 1 is 10-30m, the directional drilling can be implemented by the directional drilling machine 1, or the drilling can be implemented by a drilling track measuring device matched with a conventional drilling machine, the drilling track can be intuitively mastered by the directional drilling, holes can be effectively prevented from being crossed by the implemented drilling holes, and a blank zone is prevented from being left in coal seam gas control. The diameter of a directional drilling hole 1 constructed by the directional drilling machine is larger than or equal to 98mm, a sleeve is arranged in the range of a main hole 4 from a hole opening to 10m in the drilling hole, and the hole opening scouring enlargement caused by hole opening slag tapping when drilling water is used for drilling the drilling hole is prevented.
Thirdly, the permeability coefficient of the coal seam is lambda<0.1m2/MPa2D, borehole flow attenuation coefficient α>0.05d-1According to the drainage-difficult geological unit, a plurality of drill holes constructed in the second step are selected as the ventilation holes, other drill holes are used as drainage holes for drainage coal bed gas, positioning disturbance technologies such as drilling and punching integration, point type hydraulic fracturing or controllable shock wave permeability increase and the like are carried out in the permeability increase holes, the permeability of the coal bed is improved accurately by implementing positioning disturbance permeability increase measures, and drainage standard reaching in the pre-drainage period is guaranteed; for coal seam permeability coefficient is lambda>0.1m2/MPa2D, borehole flow attenuation coefficient α<0.05d-1The gas extraction is carried out after the directional drilling is directly carried out without increasing the permeability of the coal bed in the extractable area and the easily extractable area;
thirdly, sealing the constructed directional borehole 1 (including an extraction hole and a ventilation hole), and performing networking negative pressure extraction through an extraction pipeline, wherein the extraction pipeline is provided with a gas extraction online monitoring system for performing online monitoring and measurement on the gas extraction amount, the residual gas content and the extraction dynamic state of a single borehole or a hole group in an extraction geological unit, the online monitoring system comprises a gas extraction comprehensive parameter measuring instrument for measuring the gas flow, the gas concentration and the like on the extraction pipeline and a display in signal connection with the gas extraction parameter measuring instrument, the display is arranged in a ground dispatching room, the monitoring system performs real-time statistics on the gas extraction amount according to online monitoring data, and displays the gas extraction amount and the residual gas content in different areas in real time in the form of cloud charts with different colors on the display, so that the gas extraction amount and the residual gas content can be visually checked conveniently;
fourthly, when the online monitoring system displays the residual of all coal seam drill holes and hole groups in the extraction geological unitThe residual gas content is reduced to the gas content Q<8m3T, gas pressure P<When the pressure is 0.74MPa, performing deep-hole fixed-point closed pressure-maintaining sampling on a coal seam construction directional drilling hole 1 in an extraction geological unit, measuring the coal seam gas content and the coal seam gas pressure, installing a deep-hole fixed-point closed sampler between a sampling drill bit of a directional drilling machine and a cable-through drill rod, when the directional drilling machine drills to a designed sampling hole depth, withdrawing the drilling machine, replacing the sampling drill bit and the sampler, lowering the drill rod into the drilling hole again, measuring the coal seam gas pressure, controlling the drill bit to break coal and drill a coal sample by the drilling machine, withdrawing the drill bit after sampling is completed, measuring the coal sample gas content, controlling the gas of the coal seam in a section, and if the width of the section or the width of a withdrawal area does not exceed 120m, arranging at least two detection test points at intervals of 30 ~ 50m along the advancing direction of a coal face, otherwise, arranging at least three detection test points at intervals of 30 ~ 50m along the advancing direction of the coal face, wherein the width of the withdrawal area is the length of a cutting hole 2, and the length of an air roadway.
Fifthly, when the measurement results of all gas parameters in the extraction geological unit reach the coal seam gas content Q<8m3T, gas pressure P<When the pressure is 0.74MPa, judging that the gas treatment of the extraction geological unit reaches the standard; when there is sample gas content Q in the region>8m3T or gas pressure P>And when the pressure is 0.74MPa, the gas control in the area does not reach the standard, the distance between 1 hole of the adjacent directional drilling holes is encrypted to 5-10m, and the steps from the second step to the fifth step are continued until the gas content of all samples in the area reaches the standard.
In the embodiment 1, as shown in fig. 1 to 4, the directional drilling 1 is constructed along the coal seam direction from the rock roadway of the upper mountain, and the arrangement form of the main hole 4 and the branch hole 6 can be divided into three cases according to the firmness of the coal seam:
1. as shown in fig. 2, the main bore 4 may alternatively be disposed in the coal seam;
2. as shown in fig. 3, the main hole 4 is arranged in the coal seam top/bottom stable rock stratum, a branch hole 6 is opened from the inner side of the main hole 4 to the coal seam, and the branch hole 6 extends 30-50m along the coal seam after entering the coal seam;
3. as shown in fig. 4, the main hole 4 is arranged in the coal seam roof/floor stable rock stratum, a branch hole 6 is opened from the inner side of the main hole 4 to the coal seam, and the branch hole 6 penetrates the coal directly into the coal seam roof/floor after the coal is seen.
In this embodiment 2, for a mining working face with an upper and a lower bottom extraction lanes 8 excavated, the directional drilling 1 may also be constructed from the upper bottom extraction lane 7 and/or the lower bottom extraction lane 8 along the coal seam direction toward the direction of the cutting hole 2, as shown in fig. 5, the main hole 4 and the branch hole 6 are also divided into three cases; in addition, for a mining working face with a larger length, for example, the length of the working face is greater than 200m, the directional drilling 1 can also be constructed along the coal seam inclination from the upper bottom drawing lane 7 and/or the lower bottom drawing lane 8, as shown in fig. 6, or along the coal seam inclination from the air lane 3 and/or the machine lane 5, as shown in fig. 7, the arrangement form of the main holes 4 and the branch holes 6 can be divided into 3 cases according to the coal seam firmness, and reference to example 1 is not repeated here.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.

Claims (7)

1. A protruding coal seam 'wuding' gas treatment method based on a directional drilling machine is characterized by comprising the following steps:
firstly, collecting and collating geological exploration drilling data in a target area, dividing different extraction geological units and evaluating the feasibility of adopting a 'five-set' gas control method for each extraction geological unit;
secondly, directionally drilling the extraction geological unit with the feasibility of the 'five-fixed' gas treatment method in the first step, and for the soft coal seam with the firmness coefficient f of the coal seam being less than 0.5, selecting to arrange a main hole which is directionally drilled in a rock stratum at the top or the bottom of the coal seam, and constructing a branch hole from the inside of the main hole to the coal seam; for a hard coal seam with the coal seam firmness coefficient f being more than or equal to 0.5, directly arranging the directionally drilled main holes in the coal seam;
thirdly, if the coal bed has the air permeability coefficient of lambda<0.1m2/MPa2D, borehole flow attenuation coefficient α>0.05d-1Selecting the second place for the difficult-to-extract geologyA plurality of drill holes constructed in the step are used as enhanced holes, other drill holes are used as extraction holes for extracting coal seam gas, positioning disturbance is carried out in the enhanced holes, and the coal seam is enhanced; if the permeability coefficient of the coal seam is lambda>0.1m2/MPa2D, borehole flow attenuation coefficient α<0.05d-1The gas extraction is carried out after the directional drilling is directly carried out in the easily-extracted area without the permeability increase of the coal bed;
fourthly, hole sealing is carried out on the enhanced hole and the extraction hole, networking negative pressure extraction is carried out through an extraction pipeline after hole sealing, and a gas extraction online monitoring system for carrying out online monitoring and measurement on the gas extraction quantity, the residual gas content and the extraction dynamic state of drill holes or hole groups in different extraction geological units is arranged on the extraction pipeline;
fifthly, displaying that the residual gas content of all the drill holes or the drill hole groups reaches Q by the online monitoring system in the fourth step<8m3The extraction geological unit of/t carries out deep hole fixed point closed sampling to carry out gas parameter measurement, and the gas content and the gas pressure of a coal seam are measured;
sixthly, when the measurement results of all gas parameters in the extraction geological unit reach the coal seam gas content Q<8m3T, gas pressure P<When the pressure is 0.74MPa, evaluating the extraction geological unit as that the gas treatment judgment standard reaches, and repeating the second step to the fifth step after the encrypted drilling of the extraction geological unit with the measurement result not reaching the standard until the coal seam gas content and the gas pressure of all gas parameter measuring points in the extraction geological unit reach Q<8m3/t、P<And when the pressure is 0.74MPa, the gas treatment judgment of the extraction geological unit reaches the standard.
2. The method for treating 'wuding' gas in the outburst coal seam based on the directional drilling machine as claimed in claim 1, wherein: the directional drilling in the second step is drilling through a directional drilling machine or drilling through a track measuring device matched with a conventional drilling machine.
3. The method for treating 'wuding' gas in the outburst coal seam based on the directional drilling machine as claimed in claim 1, wherein: in a second step, the directionally drilled main bore is lined with a casing within a depth of about 10m from the bore opening.
4. The method for treating 'wuding' gas in the outburst coal seam based on the directional drilling machine as claimed in claim 1, wherein: in the second step, the diameter of the directional drilling hole is more than or equal to 98 mm.
5. The method for treating 'wuding' gas in the outburst coal seam based on the directional drilling machine as claimed in claim 1, wherein: in the fourth step, the online monitoring system comprises a gas drainage comprehensive parameter measuring instrument arranged on the drainage pipeline, the gas drainage comprehensive parameter measuring instrument is connected with a gas drainage monitoring system, the gas drainage monitoring system is arranged in the ground dispatching room, and the gas drainage quantity and the residual gas content of different drill holes or hole groups are displayed on the gas drainage monitoring system in different colors.
6. The method for treating 'wuding' gas in the outburst coal seam based on the directional drilling machine as claimed in claim 1, wherein: in the second step, for the soft coal seam with the firmness coefficient f of the coal seam less than 0.5, the main hole on the top plate or the bottom plate of the coal seam has a certain distance, generally 3-20m, from the coal seam, and the branch hole penetrates into the coal seam from the top plate or the bottom plate of the coal seam or extends along the coal seam for a distance of 30-50m, or penetrates into the coal seam from the top plate or the bottom plate of the coal seam and then directly penetrates into the bottom plate or the top plate of the coal seam.
7. The method for 'penta' gas remediation of outburst coal seams based on directional drilling machines as claimed in claim 1, wherein in the fifth step, for gas remediation of a sectioned coal seam, if the width of the section or the width of a stoping area does not exceed 120m, at least two test points are arranged at intervals of 30 ~ 50m in the advancing direction of the coal face, otherwise, at least three test points are arranged at intervals of 30 ~ 50m in the advancing direction of the coal face.
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CN111878079A (en) * 2020-06-05 2020-11-03 平顶山天安煤业股份有限公司 Method for treating gas of soft outburst coal seam of underground large mining length working face of coal mine
CN112593997A (en) * 2020-12-11 2021-04-02 山西晋煤集团技术研究院有限责任公司 Method for extracting gas in goaf through top plate high-position comb-shaped drill hole

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Publication number Priority date Publication date Assignee Title
CN111594258A (en) * 2020-04-29 2020-08-28 中煤科工集团西安研究院有限公司 Technical method for quickly extracting gas to reach standard by using broken soft low-permeability outburst coal seam instead of roadway through holes
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CN112593997A (en) * 2020-12-11 2021-04-02 山西晋煤集团技术研究院有限责任公司 Method for extracting gas in goaf through top plate high-position comb-shaped drill hole

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