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Method for determining grid type layer-through drilling intervals of floor roadway

A technology of drilling through layers and measuring methods, which is applied in the directions of surveying, earthwork drilling, gas discharge, etc., and can solve the problem that the measured drilling holes cannot truly reflect the drilling drainage effect, cannot meet the requirements of rapid measurement, and the measurement results are unreliable, etc. problems, to achieve the effects of eliminating outstanding risks, measuring quickly, and shortening the construction period

Inactive Publication Date: 2011-07-06
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0003]1) The layout of the measured boreholes cannot truly reflect the drainage effect of the boreholes on the control area under the condition of grid-through-layer drilling, so the measurement results are inaccurate
[0004]2) Due to the heterogeneous structure of the coal seam, after the construction of the gas drainage hole, it is possible that one of the gas drainage holes will be connected with the pressure hole through the crack, resulting in pressure The pressure value of the hole drops rapidly, which cannot truly reflect the decline of residual gas in the entire drainage area. Therefore, only one index of gas pressure is used as the measurement index, and the measurement results are not reliable.
[0005] 3) Due to the use of the measurement method from far to near, the measurement time is long, which cannot meet the requirements of on-site rapid measurement

Method used

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  • Method for determining grid type layer-through drilling intervals of floor roadway
  • Method for determining grid type layer-through drilling intervals of floor roadway
  • Method for determining grid type layer-through drilling intervals of floor roadway

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Embodiment Construction

[0022] The method for measuring the interlayer drilling distance of the bottom slate roadway of the present invention is realized by measuring the layout of the boreholes and determining the spacing of the interlayer drilling holes in the grid format, and the specific steps are as follows:

[0023] (1) Determination of the layout of the borehole

[0024] a. First, at least three pressure holes 1 for measuring coal seam gas pressure are constructed in groups perpendicular to the coal seam direction in the floor rock roadway 3, and pressure gauges are installed, such as figure 2 , image 3 The layout shown is 1#, 2# and 3# pressure holes 1 respectively, the distance between each pressure hole 1 is not less than 40m, when the pressure gauge gradually rises to the maximum value, the pressure of 1# hole is 2.12MPa, 2# The pressure of the hole is 2.15MPa, and the pressure of the 3# hole is 2.05MPa. Through the analysis, it is considered that the gas pressure of the coal seam in ...

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Abstract

The invention relates to a method for determining grid type layer-through drilling intervals of a floor roadway, which can accurately and quickly determine the effective intervals of layer-through drilling of an outburst coal seam within a certain period of time by adopting the arrangement of the determining drilling holes and determining the grid type layer-through drilling intervals, simultaneously arranging multiple groups of the determining drilling holes and adopting the determination of double indexes, namely residual gas pressure of a coal seam and residual gas content, so as to effectively reduce the gas content in the coal seam and eliminate the outburst risk by the determined layer-through drilling intervals on the one hand, and reduce the drilling engineering quantity to the greatest extent, shorten the construction period of drilling, and further ensure the balance of pumping, excavation and mining of the outburst coal seam on the other hand. The method is simple, the measurement speed is fast, and the determined results are accurate and reliable.

Description

Technical field [0001] The present invention involves a method of penetrating drilling pitching method for pumping coal seams of gas, especially a metering method for the piercing pores of the Diaoyan Lane Format for the safety of coal mine production. Background technique [0002] According to the "Prevention and Treatment of Coal and Gas" promulgated and implemented by the National Safety Production Supervision and Administration Bureau on August 1, 2009, the gas governance of the coal seams should follow the principle of "regional anti -proactive measures and local anti -proactive measures".For highlighting coal seams, it is necessary to first use regional proactive measures to eliminate the prominent risk of coal seams before the coal seam mining operations can be carried out, and regional anti -proactive measures can be placed in the primary position.At present, regional anti -proactive measures include protective layer mining technology and pre -pumping coal seam gas techno...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B47/00E21B47/06
Inventor 王海锋程远平李伟翟清伟孔胜利
Owner CHINA UNIV OF MINING & TECH
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