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A Method for Accurately Measuring the Disturbance Range of Gas-Phase Fracturing

An accurate measurement and range technology, applied in the field of accurate determination of gas phase fracturing disturbance range, can solve problems such as increased costs, hidden dangers of safe production, and inaccurate test disturbance range

Active Publication Date: 2019-01-25
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the disturbance range is determined too large, a blank zone will be formed between the drainage boreholes, making it difficult to meet the standard for drainage, which will bring hidden dangers to safe production; Added unnecessary costs
[0003] However, there is currently no method for accurately analyzing and calculating the disturbance range of gas-phase fracturing. Due to the anisotropy of coal, it is not accurate to simply test the disturbance range at the same hole height.

Method used

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Embodiment Construction

[0024] The invention provides a method for accurately measuring the disturbance range of gas phase fracturing, the method has the following steps:

[0025] (1) On the roadway coal wall in the area where gas-phase fracturing is required, four disturbance recording holes S are arranged around the fracturing holes, which are upwardly inclined by 2 degrees along the coal seam direction 1 , S 2 , S 3 , S 4 , hole S1 is a hole opened 0.5m away from the upper part of the roadside, 6m away from the left side of the fracturing hole position, hole S 2 The hole height is 1.5m, located 3m to the left of the fracturing hole, hole S 3 It is a hole opened 0.5m away from the upper part of the side of the roadway and 3m away from the right side of the fracturing hole position. Hole S 4 The hole height is 1.5m, located 6m to the right of the fracturing hole;

[0026] (2), use 4 branch pipes to go down to 40m in the disturbance recording hole and seal the hole, the hole sealing depth is 30m...

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Abstract

The invention discloses a method for accurately measuring the gas phase fracture disturbance range. Influence from other factors is eliminated by observing and researching the pressure fluctuation change of a disturbance register hole in the drilling, fracture and natural discharging processes of gas phase fracture holes, the pressure fluctuation change, generated after the fracture holes are sealed for a period, of the disturbance register hole, the pressure fluctuation change, generated when nitrogen injection testing is carried out on the fracture holes, of the disturbance register hole, and the permeability changes of the fracture holes, so that the gas phase fracture disturbance range is tested and analyzed. The method can effectively obtain the gas phase fracture disturbance range through measurement, and provides a reliable basis for spacing arrangement of the fracture holes, the number of the fracture holes and the like.

Description

technical field [0001] The invention relates to a method for accurately measuring the disturbance range of gas phase fracturing, which belongs to the technical field of coal mining. Background technique [0002] At present, underground gas drainage is mainly based on bedding gas drainage technology, which plays an important role in reducing the gas content of coal seams and preventing coal and gas outburst. The layout of gas drainage boreholes in this coal seam is mainly determined by the drainage radius. Gas-phase fracturing can effectively increase the gas permeability of coal seams, expand the drainage radius of boreholes, and shorten the pre-drainage time. Determining the disturbance range of gas-phase fracturing plays a vital role in gas drainage. If the disturbance range is determined too large, a blank zone will be formed between the drainage boreholes, making it difficult to meet the standard for drainage, which will bring hidden dangers to safe production; Unneces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00
Inventor 曹运兴王建涛孙丙周王永生杜冬冬崔宏伟刘艳伟吴阳张军胜刘炎杰
Owner HENAN POLYTECHNIC UNIV
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