WO2018201714A1 - 一种煤矿瓦斯的精准抽采方法 - Google Patents
一种煤矿瓦斯的精准抽采方法 Download PDFInfo
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- WO2018201714A1 WO2018201714A1 PCT/CN2017/114363 CN2017114363W WO2018201714A1 WO 2018201714 A1 WO2018201714 A1 WO 2018201714A1 CN 2017114363 W CN2017114363 W CN 2017114363W WO 2018201714 A1 WO2018201714 A1 WO 2018201714A1
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- coal
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- borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Definitions
- the invention relates to a precise extraction method for coal mine gas, and is particularly suitable for precise and efficient gas extraction of gas containing coal seam under coal mine, including accurate positioning of the final hole point of the borehole and accurate quantification of gas extraction amount and residual gas content. Therefore, the gas drainage blank belt caused by improper design of the drilling hole can be avoided.
- Gas drainage by drilling is the main measure for gas prevention. Due to the poor permeability of coal seams in China, the impact range of surface drilling is small, and the drainage effect is poor. Most of them are drilled by constructing small-diameter boreholes in coal mines. These boreholes are simple in construction and large in quantity. However, at present, the extraction effect is not satisfactory. The main reason is that the coal seam is relatively soft compared with other hard rock and the distance is short, which makes the construction track of the borehole difficult to control. It is not clear where the length and final hole point fall. However, most of the existing designs are based on the assumption that the borehole is a straight bored hole constructed from the opening point, and the end position of the borehole is not accurately located.
- the purpose of the present invention is to solve the problem of inaccurate design and construction of coal mine gas drainage holes, resulting in uneven time and space of coal seam gas drainage, and there is a problem of extracting blank belts, and providing a precise mining method for coal mine gas.
- the precise positioning of the coal seam and the accurate design of the gas drilling method are adopted to realize the precise extraction of coal mine gas and improve the pertinence of gas control.
- the precise extraction method of the coal mine gas of the present invention comprises the following steps:
- the stratum section in the step (a) adopts a stratum profiler, and the construction site scans along the roadway direction in the coal seam floor roadway.
- the formation detecting borehole in the step (b) shall be constructed to pass through the coal section until the coal slag is not discharged.
- the method for depicting the trend, tendency, and thickness variation of the coal seam in the area to be extracted in the step (c) is a comprehensive determination method combining the combination of the profile profile scanning and the drilling coordinate correction: firstly, the formation profile is determined by the formation profile analyzer. The trend of the formation, and then use the drilling coordinates to determine the exact boundary of the coal seam.
- the actual coal seam floor and the top plate in the step (f) see the coal point coordinates, and the endoscopic camera is used to record the corresponding track points of the drill floor and the coal seam and the top plate see the coal end point, and then the drilling track points recorded in the gyroscope The corresponding correspondence determines the specific coordinate value.
- the method for adjusting the drilling construction parameter in the step (g) is: firstly, adjusting the azimuth angle, so that the horizontal drilling length of the coal seeing point of the actual drilling trajectory and the designing roof is the same as the horizontal projection length in the vertical direction of the roadway, and then The opening position is adjusted in the opposite direction of the offset direction according to the offset of the borehole in the direction of the lane.
- the present invention can accurately understand the occurrence of coal seams and gas by implementing the precise extraction method of coal mine gas, and accurately design gas drainage according to the actual occurrence of coal seams and gas.
- the construction parameters can be adjusted to accurately reach the predetermined drilling design position, thereby avoiding the inaccuracy of the engineers and technicians to understand the changes in coal seams and gas, and the resulting coal mine gas drainage
- the design of the mining project is not in place, causing problems in the extraction of blank strips.
- FIG. 1 is a schematic view showing an implementation flow of the present invention
- FIG. 2 is a schematic view showing a method for detecting the trend of coal seam orientation, tendency, and coal seam thickness variation according to the present invention.
- Figure 3 is a schematic cross-sectional view of the borehole design and actual trajectory of the present invention.
- FIG. 4 is a schematic perspective view showing the correspondence relationship between the azimuth angle, the inclination angle and the length of the drill hole of the present invention and the actual coal spot coordinates, the hole bottom coordinates and the three-dimensional drilling trajectory.
- FIG. 5 is a schematic diagram showing the relative relationship between the design trajectory, the actual drilling trajectory and the corrected boring trajectory on the horizontal plane of the present invention.
- the precise extraction method of the coal mine gas of the present invention comprises the following steps:
- step (h) Adjust the drilling opening parameters according to the three-dimensional orientation relationship between the construction parameters of the drilling opening point and the actual coal point parameters of the drilling hole; the method for adjusting the drilling construction parameters in the step (h) is: firstly adjust the orientation The angle, so that the top hole of the actual drilling track and the design roof are the same as the horizontal projection length of the coal point in the vertical direction of the roadway, and then the opening is adjusted in the opposite direction of the offset direction according to the offset in the direction of the roadway. Point coordinates.
- the coal seam gas content of a coal mine is 12m 3 /t, and the thickness of the coal seam is 4m.
- the floor roadway is 1km long, and the vertical distance of the floor roadway from the coal seam is 10m.
- the coal seam gas is pre-extracted to reduce the gas content in the pre-drainage zone to below 8 m 3 /t.
- the length and width of the pre-drainage zone are 30m and 4m respectively, and the coal density is 1.2t/m 3 .
- the coal reserves that can be effectively controlled are 576 tons. Originally designed 7 holes, the gas can be extracted 2304m 3 for 6 months, so that the residual gas content can reach 8m 3 /t or less.
- the coal seam layer 2 is scanned at a uniform speed along the tunneling direction of the floor roadway to detect the general trend of the coal seam 3.
- the drilling machine is installed in the roadway. Install a hole peeper and a gyroscope in the drill pipe near the drill bit, and drill a vertical formation to the coal seam along the roadway every 10 meters.
- the drill hole can also be used for late gas drainage.
- the coal seam 5 and the actual top plate of the borehole are located at the 6th position of the coal end point, respectively connecting all the bottom plates to see the coal point and the top plate seeing the coal end point, and obtaining the accurate trending position map of the coal seam bottom plate 7 and the coal seam roof plate 8.
- the actual coal seam thickness of the pre-drainage area is 3.5m, which is less than the thickness of the geologic coal seam of 4m, and the actual controlled coal reserves in the pre-drainage area are 504 tons.
- a drilling machine is installed, and a set of actual construction drilling holes 901 to 907 are formed after the completion of the construction, as shown in FIG. 3; the parameters of each drilling hole are separately tracked and recorded by the gyroscope and the endoscopic camera.
- the drilling design parameters and actual completion parameters are shown in Table 1. Taking the 907 drilling as an example, the orientation relationship between the designed drilling and the actual construction drilling is shown in Fig. 4;
- the angular unit in the table is “°”, and the coordinates and the length of the hole are “m”.
- the drilling correction is performed.
- the 907 borehole first adjust the actual azimuth angle 13 of the borehole to the borehole azimuth angle 14 after the correction, so that the actual trajectory after adjusting the azimuth angle is consistent with the abscissa X of the design drill hole 10, since only the azimuth angle is adjusted.
- the shape of the drilling trajectory will be changed. Therefore, the length L of the horizontal projection 18 of the trajectory after the rectification is the same as the length of the horizontal projection 16 of the actual drilling trajectory, that is, the actual top plate of the 907 hole in Table 1 is the X coordinate value of the coal end point.
- L P , L P is equal to the horizontal projection of the borehole trajectory after the azimuth correction of the actual construction bore 907.
- the projection length L J on the Y-axis Subtract the projection length L Y of the design drill hole 10 on the Y axis.
- the 901-907 drilled holes after rectification and re-construction are connected to the gas drainage pipeline, and the accumulated single-meter gas extraction amount of each drilling hole is measured for 6 months, and is filled in Table 2.
- the gas volume of 2816.8m 3 can be accumulated in 6 months, which can actually reduce the gas content in the control area by 5.6m 3 /t and the residual gas content is 6.4m 3 . /t, meet the requirements.
- the design and construction parameters of each group of holes are the same. Therefore, the other groups of holes are constructed according to the above-mentioned corrected drilling design parameters, and the drilling of the group is achieved.
- the design is expected to improve the accuracy of the design and construction.
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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Geophysics And Detection Of Objects (AREA)
- Gyroscopes (AREA)
- Sampling And Sample Adjustment (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims (6)
- 一种煤矿瓦斯的精准抽采方法,其特征在于,包括以下步骤:(a)在煤层的待抽采区域进行地层剖面扫描;(b)在地层剖面扫描区域施工地层探测钻孔;(c)描绘待抽采区域的煤层走向、倾向、煤层厚度变化趋势图;(d)根据待抽采区域的煤层参数和瓦斯抽采达标要求,确定需要施工的钻孔数量及其具体施工参数;(e)在待施工位置固定钻机,并在钻机的钻头内部安装陀螺仪和内窥摄像头;(f)利用钻机在煤层中施工并跟踪一组各种不同施工参数钻孔的轨迹,记录钻孔开孔点施工参数与实际见煤点坐标和孔底坐标;(g)根据钻孔开孔点施工参数与钻孔实际见煤点参数的三维方位关系,调整钻孔开孔参数;(h)将钻孔连接到抽采管路,并安装孔口流量计,记录不同钻孔瓦斯抽采流量和单米瓦斯抽采流量;(i)根据调整后的钻孔施工参数和单米,设计并精确施工其它钻孔至预定设计的钻孔位置,施工完毕后密封钻孔,进行瓦斯抽采。
- 根据权利要求1所述的一种煤矿瓦斯的精准抽采方法,其特征在于:所述步骤(a)中的地层剖面扫描采用地层剖面仪,施工地点在煤层底板巷道中沿巷道掘进方向扫描。
- 根据权利要求1所述的一种煤矿瓦斯的精准抽采方法,其特征在于:所述步骤(b)中的地层探测钻孔应施工穿过见煤段,直至不排出煤渣为止。
- 根据权利要求1所述的一种煤矿瓦斯的精准抽采方法,其特征在于:所述步骤(c)中的待抽采区域的煤层走向、倾向、煤层厚度变化趋势图描绘方法采用地层剖面仪扫描和钻孔坐标修正相结合的综合判定方法:首先用地层剖面仪确定含煤地层的走向趋势,然后利用钻孔坐标划定煤层的准确边界。
- 根据权利要求1所述的一种煤矿瓦斯的精准抽采方法,其特征在于:所述步骤(f)中的实际煤层底板和顶板见煤点坐标,利用内窥摄像头记录钻孔底板见煤点和顶板见煤终点各自的对应轨迹点,然后在陀螺仪记录的钻孔轨迹点上对应确定具体的坐标数值。
- 根据权利要求1所述的一种煤矿瓦斯的精准抽采方法,其特征在于:所述步骤(g)中调整钻孔开孔参数的方法为:首先调整方位角,使实际钻孔轨迹的顶板见煤点与设计顶板见煤点在与巷道垂直方向上的水平投影长度相同,然后根据钻孔在巷道方向上的偏移量沿偏移方向的反方向调整开孔位置。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2017404561A AU2017404561B2 (en) | 2017-05-02 | 2017-12-04 | Method for precisely extracting coal-mine gas |
| US16/090,080 US11060384B2 (en) | 2017-05-02 | 2017-12-04 | Method for precisely extracting coal-mine gas |
| RU2018135739A RU2682820C1 (ru) | 2017-05-02 | 2017-12-04 | Метод точной добычи рудничного газа |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710301504.0 | 2017-05-02 | ||
| CN201710301504.0A CN107100663B (zh) | 2017-05-02 | 2017-05-02 | 一种煤矿瓦斯的精准抽采方法 |
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| Publication Number | Publication Date |
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| WO2018201714A1 true WO2018201714A1 (zh) | 2018-11-08 |
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| PCT/CN2017/114363 Ceased WO2018201714A1 (zh) | 2017-05-02 | 2017-12-04 | 一种煤矿瓦斯的精准抽采方法 |
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| Country | Link |
|---|---|
| US (1) | US11060384B2 (zh) |
| CN (1) | CN107100663B (zh) |
| AU (1) | AU2017404561B2 (zh) |
| RU (1) | RU2682820C1 (zh) |
| WO (1) | WO2018201714A1 (zh) |
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| CN110991081A (zh) * | 2019-12-19 | 2020-04-10 | 中国矿业大学 | 一种基于地面钻孔抽采瓦斯确定邻近层抽采瓦斯量的方法 |
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| CN113236365A (zh) * | 2021-05-10 | 2021-08-10 | 晋能控股煤业集团同忻煤矿山西有限公司 | 一种特厚煤层顶煤跨落角现场实测方法 |
| CN113236365B (zh) * | 2021-05-10 | 2024-02-06 | 晋能控股煤业集团同忻煤矿山西有限公司 | 一种特厚煤层顶煤跨落角现场实测方法 |
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| CN114109474B (zh) * | 2021-08-25 | 2023-04-25 | 河南理工大学 | 一种智能化煤矿风井防爆门实验装置及使用方法 |
| CN113742946A (zh) * | 2021-10-09 | 2021-12-03 | 太原理工大学 | 一种矿用定向钻孔轨迹跟踪方法、系统及可存储介质 |
| CN113742946B (zh) * | 2021-10-09 | 2023-10-03 | 太原理工大学 | 一种矿用定向钻孔轨迹跟踪方法、系统及可存储介质 |
| CN115438308A (zh) * | 2022-09-06 | 2022-12-06 | 中煤科工集团重庆研究院有限公司 | 一种基于分源统计的区块瓦斯含量验证及预测方法 |
| CN115387774A (zh) * | 2022-09-15 | 2022-11-25 | 中煤科工集团重庆研究院有限公司 | 突出煤层工作面一孔多用全时空高效瓦斯治理方法 |
| CN115387774B (zh) * | 2022-09-15 | 2023-08-08 | 中煤科工集团重庆研究院有限公司 | 突出煤层工作面一孔多用全时空高效瓦斯治理方法 |
| CN115506769A (zh) * | 2022-09-26 | 2022-12-23 | 中煤科工集团重庆研究院有限公司 | 煤层顶板裂隙带瓦斯立体抽采方法 |
| CN115680571A (zh) * | 2022-10-25 | 2023-02-03 | 贵州盘江煤电集团技术研究院有限公司 | 一种智能瓦斯抽采方法及系统 |
| CN115680571B (zh) * | 2022-10-25 | 2024-02-06 | 贵州盘江煤电集团技术研究院有限公司 | 一种智能瓦斯抽采方法及系统 |
| CN115898406A (zh) * | 2023-01-04 | 2023-04-04 | 中煤科工西安研究院(集团)有限公司 | 一种基于底板定向梳状孔的碎软煤层透明工作面构建方法 |
| CN116427996B (zh) * | 2023-04-18 | 2023-09-26 | 淮北工业建筑设计院有限责任公司 | 利用地面瓦斯抽采管实现注浆充填的管理系统及方法 |
| CN116427996A (zh) * | 2023-04-18 | 2023-07-14 | 淮北工业建筑设计院有限责任公司 | 利用地面瓦斯抽采管实现注浆充填的管理系统及方法 |
| CN119539216A (zh) * | 2025-01-23 | 2025-02-28 | 贵州省煤层气页岩气工程技术研究中心 | 一种煤层气开采量智能预测方法及系统 |
Also Published As
| Publication number | Publication date |
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| US20210040822A1 (en) | 2021-02-11 |
| AU2017404561A1 (en) | 2018-11-22 |
| RU2682820C1 (ru) | 2019-03-21 |
| US11060384B2 (en) | 2021-07-13 |
| AU2017404561B2 (en) | 2020-09-17 |
| CN107100663A (zh) | 2017-08-29 |
| CN107100663B (zh) | 2019-08-06 |
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