Coal seam contour drawing method based on downhole directional holes
A technology of directional holes and contour lines, applied in the field of high line drawing, can solve problems such as large error of coal seam contour lines
Active Publication Date: 2018-05-25
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology
[0005] Therefore, the present invention combines the needs of grasping the undulation of the coal seam in advance in the process of coal seam excavation, and aims at the deficiency that the error of the coal seam contour line in the plan view of the current coal mine excavation engineering is too large, researches and designs a method for drawing the coal seam contour line based on the underground directional hole, to overcome the above defects
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[0035] see figure 1 , a coal seam contour drawing method based on downhole directional holes, comprising the following steps:
[0036] Step 1: Downhole directional hole 1 construction and trajectory parameter measurement. A near-horizontal downhole directional hole 1 is constructed in the coal mine excavation space. During the drilling process, the top boundary line 5 is explored upwards every 60-100 m to ensure that the downhole directional hole 1 extends along the coal seam 2 . At the same time, every 3-6m of drilling, the measurement-while-drilling measurement device is used to measure the drilling trajectory parameters to obtain the inclination angle and azimuth angle corresponding to the depth of the downhole directional hole 1, and the hole depth is obtained by accumulating the drill pipe.
[0037] Step 2: Calculation of the relative coordinate value of the borehole. Taking the opening point 7 of the downhole directional hole 1 as the coordinate origin, the extension d...
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The invention relates to a method for drawing contour lines of coal seams based on underground directional holes, belonging to the field of underground tunnel drilling in coal mines. The method utilizes the exploration roof and exploration floor data of underground directional holes constructed by coal mining enterprises in large quantities, and combines the relative coordinate system used in the description of the underground directional holes with the elevation system and mine plane coordinate system conversion used in the coal mine excavation engineering plan to calculate the borehole extension. The elevation of the bottom boundary line of the coal seam in the direction is obtained, the elevation value of the equal-fold elevation point and the coordinate value of the mine plane are obtained, and then the actual coal seam contour line is drawn in turn by connecting the lines. The method solves the problem of large errors in the coal seam contour lines drawn by the previous ground exploration hole construction data and the ground geophysical exploration results, and realizes the accurate drawing and real-time correction of the coal seam contour lines, which is helpful for the design and development of coal mining engineering. Provide accurate reference for construction, detection of hidden geological anomalies, etc., to ensure safe and efficient mining of coal seams.
Description
technical field [0001] The invention relates to a contour line drawing method, which belongs to the field of coal mine tunnel drilling, and in particular to a coal seam contour line drawing method based on an underground directional hole. Background technique [0002] The mining engineering plan is a drawing drawn on a certain scale by using the principle of elevation projection and the mining engineering and geological conditions in the mining coal seam or its layers. The excavation engineering plan is an important reference for mine production and construction. The undulation of the coal seam can be obtained according to the contour line of the coal seam, and the excavation engineering and drilling layout can be carried out, and it can assist in the detection of hidden disaster-causing geological anomalies to ensure safe construction. It plays a major role . [0003] However, coal seam mining in my country is dominated by underground mining, and the mining space is genera...
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IPC IPC(8): E21B7/04E21B47/022
CPCE21B7/04E21B47/022
Inventor 李泉新方俊许超刘建林曹明金鑫毕志琴刘飞
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP