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Method for downhole solving water blocking of mining-induced L-shaped well

An L-shaped, well water technology, applied in wellbore/well components, drainage, production fluids, etc., can solve problems such as impact, and achieve the effect of ensuring smooth progress, saving costs, and avoiding waste of manpower and material resources

Inactive Publication Date: 2019-03-08
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an underground method for solving L-shaped well water plugging in mining, and solve the influence of L-shaped underground concave water plugging on ground drainage

Method used

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  • Method for downhole solving water blocking of mining-induced L-shaped well

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Embodiment Construction

[0020] This embodiment provides an underground method for solving L-shaped well water plugging in mining, including the following steps,

[0021] S1, determine the L-shaped well trajectory depression

[0022] Draw the L-shaped well trajectory according to the logging-while-drilling data, and obtain the specific position of the depression section 5 of the L-shaped well trajectory;

[0023] S2, Optimizing the Design Parameters of Hydrophobic Pores

[0024] According to the specific position of the concave section 5 of the L-shaped well trajectory, the drilling site 7 is set in the downhole roadway 8 below the L-shaped well, and 2-3 drainage holes 6 are constructed in each drilling site 7. According to relevant data, the size of the drainage holes 6 is optimized. Construction azimuth, top angle and construction length;

[0025] S3, construction of drainage holes

[0026] Open a hole from the side wall or roof of the underground roadway 8, drill no less than 5 meters, lower the...

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Abstract

The invention provides a method for downhole solving water blocking of a mining-induced L-shaped well, and belongs to the technical field of drilling water drainage. The method comprises the followingsteps that S1, a track sunken section of the L-shaped well is determined; S2, design parameters of a water drainage hole are optimized; S3, the water drainage hole is constructed; and S4, ground extraction is conducted. According to the method, specifically, by combining a construction track of the ground L-shaped well and reasonably designing the position of a coal mine downhole water drainage hole and related technical parameters, the downward-sunken position of the track of the L-shaped well is connected in a butted mode, thus water seeping to the downward-sunken position is drained through the water drainage hole, and the influence of water blocking of the downward-sunken position of the L-shaped well on ground extraction is avoided; and on the one hand, the function of the water drainage hole is utilized reasonably, and on the other hand, the relocation cost of equipment for ground treatment of water blocking of the L-shaped well and related well workover costs are also lowered.

Description

technical field [0001] The invention relates to the technical field of drilling drainage, in particular to an underground method for solving L-shaped well water plugging in mining. Background technique [0002] The L-shaped well in the mining or goaf area, hereinafter referred to as "L-shaped well", is constructed at a certain distance above the roof of the target coal seam, and the construction is completed before the first mining of the coal mining face. Gas in the goaf. Due to the heterogeneity of formation lithology and certain technical factors during the drilling of L-shaped wells, it is inevitable that the trajectory of L-shaped wells will fluctuate, and formation water will seep into the concave part of the trajectory to cause water plugging and affect the coal seam. Gas surface extraction effect. "L-shaped wells" use water ring vacuum pumps for negative pressure drainage. Affected by mining operations, the gas in the cracks on the roof is continuously extracted du...

Claims

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Application Information

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IPC IPC(8): E21F16/00E21B43/00E21B33/13
CPCE21B33/13E21B43/00E21F16/00
Inventor 秦玉霞张江华刘亮亮张永成张为徐云李德惠王越白杨崔宇翔
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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