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Test method for slag production amount and deformation of drilling hole of high-gas soft coal

A test method and gas technology, applied in the direction of volume measurement instrument/method, fuel test, capacity measurement calibration, etc., to achieve the effect of accurate test method, simple operation and reliable test results

Inactive Publication Date: 2018-01-09
CHONGQING UNIV
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Problems solved by technology

[0010] Aiming at the problems existing in the drilling deformation test of the existing simulation test, the technical problem to be solved by the present invention is to provide a method for testing the amount of slag produced and the deformation of the drilling hole in high-gas soft coal, which can truly simulate the High-gas soft coal drilling, and can accurately test the dynamic variation of drilling deformation with gas content and gas pressure

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  • Test method for slag production amount and deformation of drilling hole of high-gas soft coal

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0039] The idea of ​​the present invention is to use the volume change of the fluid in the borehole as the measurement data of the borehole deformation, and to form a high-gassy soft coal body with a certain depth and diameter by preparing a sample of the soft coal body containing high gas and then drilling along the bed. Drilling, according to the deformation of high-gas soft coal samples under external loads, the dynamic variation law of drilling deformation and slag production in high-gas soft coal with gas content and gas pressure of soft coal is obtained.

[0040] The test device used in the present invention is as figure 1 and figure 2 Shown: including reactor, drilling deformation simulator, water storage control and adjustment device, drainage measurement device and confining pressure control and adjustment device;

[0041] The reactor includes a r...

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Abstract

The invention discloses a test method for slag production amount and deformation of a drilling hole of high-gas soft coal. The test method comprises the following steps: 1, collecting high-gas soft coal sample storage parameters; 2, preparing a high-gas-soft coal sample; 3, simulating the condition of an underground high-gas soft coal seam; 4, forming a drilling hole in the high-gas soft coal seamby using a drilling hole deformation simulator; 5, recording a hole slag production amount and a hole deformation value that correspond to a gas pressure; 6, changing the diameter of the drilling hole and testing a hole deformation value of the high-gas soft coal sample; and 7, drawing a dynamic changing curvature line of hole deformation values with the hole diameter, the gas content, and the gas pressure. The method has the following advantages: high-gas soft coal drilling holes with different aperture specifications are simulated actually; and the dynamic changing rule of the hole deformation values with the gas content and the gas pressure is tested accurately.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a parameter test of coal seam drilling. Background technique [0002] The continuous slag discharge of downhole high-gas soft coal bedding drilling has always been the main problem affecting the depth of bedding drilling in soft coal. During the drilling process of gas-containing soft coal, the coal body around the hole is affected by gas pressure, in-situ stress and external loads, and the drilling structure undergoes plastic deformation and even destruction. A large amount of coal slag produced by drilling deformation accumulates in different positions in the hole, which causes the slag discharge of soft coal along the bedding to be blocked and the drilling depth is limited. [0003] As long as it is possible to test the slag production of high-gas soft coal along the bedding and the amount of residual cinder in the hole, it is possible to accurately grasp the ...

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Application Information

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IPC IPC(8): G01B13/24G01N33/22G01F19/00
Inventor 胡千庭何将福梁运培罗永江李全贵李莉佳刘姝
Owner CHONGQING UNIV
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