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Method for measuring gas pressure of coal seam by casing high-pressure hole sealing method

A technology of coal seam gas pressure and casing, applied in the direction of measurement, earthwork drilling, wellbore/well components, etc.

Inactive Publication Date: 2013-04-03
河南焦煤能源有限公司科学技术研究所
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Problems solved by technology

[0007] In view of the fact that the traditional pressure measurement and sealing method is affected by complex geological conditions and cannot guarantee the quality of the sealing, this invention proposes the use of casing high-pressure grouting to seal the hole and tightly seal the hole. Plug boreholes and fissures to ensure the quality of hole sealing, and then use the active pressure measurement method to compensate for gas to achieve rapid and accurate measurement of coal seam gas pressure

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  • Method for measuring gas pressure of coal seam by casing high-pressure hole sealing method

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Embodiment Construction

[0022] In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] like figure 1 Shown, the present invention provides a kind of casing pipe high-pressure sealing method to measure the method for coal seam gas pressure, and the method comprises the following steps: a, first adopt the drill bit opening 7 of large-diameter drill bit φ 108mm, drill into 5m (this drilling depth is with It is advisable to strengthen the casing), then withdraw the drill pipe, sweep away the drilling debris in the hole 7, and send the casing 6 with the flange 5 into the hole 7. The length of the casing is 5.5 m, and the length of the exposed hole is 500mm; b. Inject the expanded cement mortar into the hole 7 by grouting to reinforce the casing 6, and the grouting pressure is 4MPa; c. After the pressure tes...

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Abstract

The invention discloses a method for measuring gas pressure of a coal seam by a casing high-pressure hole sealing method. The method comprises the following steps: a, a hole is opened with a large-diameter drill bit, the depth of a casing can be increased by drilling, and then the casing with a flange at the outer end is sent into the hole; b, expansive cement mortar is injected into the hole in a grouting mode to enhance the casing; c, after the expansive cement mortar is solidified, drilling is carried out with a drill bit which is one size smaller than the large-diameter drill bit in step a along the original drilling center, the drilling is stopped when a coal seam is approached, and the expansive cement mortar is injected into a whole-hole section in a grouting mode for reinforcement after drilling cuttings are removed; d, after the expansive cement mortar is solidified, the hole is drilled with a drill bit which is one size smaller than the drill bit in step c along the original drilling center until the coal seam is penetrated; and e, the flange at the outer end of the casing is connected with a pressure gage to measure gas pressure. Large and small gaps and gap water around the drill hole can be effectively blocked in a high-pressure grouting method, an air leak channel is sealed, and rapid and accurate pressure measurement is realized.

Description

technical field [0001] The invention relates to a hole sealing method for directly measuring coal seam gas pressure in a coal mine, and belongs to the technical field of coal. Background technique [0002] my country's coal and gas outburst disasters are serious, which poses a major threat to mine safety production. Coal seam gas pressure is an important index to measure the risk of coal and gas outburst. Rapid and accurate determination of coal seam gas pressure is of great significance for research and evaluation of gas reserves, gas drainage and coal and gas outburst. [0003] When measuring the gas pressure of the coal seam, it is usually to drill a hole from the surrounding rock roadway to the coal seam, arrange a pressure measuring pipeline connected to a pressure gauge in the hole, seal the hole, and directly measure the gas pressure. Pressure measurement and sealing methods are divided into two types: packing method and hole sealer method. [0004] Filling sealin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/06
Inventor 杨建增张清田姚学庆贵宏伟郭艳飞俞宏庆李学军崔飞飞张荣起李小明程铁军韩红卫赵麦来周观朝黄炜
Owner 河南焦煤能源有限公司科学技术研究所
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