A working method of tunnel pressure maintaining coring equipment

Abstract

The invention discloses an operation method for tunnel pressure-holding coring equipment. By using a continuous conduit, the inner tube assembly of the core remover is placed in the coring position, and the continuous conduit and the central rod are hollow structures, and the signal cable and power The cable is placed in the hollow structure, and the continuous conduit cooperates with the multiple anti-rotation mechanisms of the inner tube assembly to prevent the rotation of the core barrel, and the core barrel is also equipped with a self-gravity valve for pressure maintenance. The invention has good operation performance, can prevent the core cylinder from rotating during the coring process, keeps the rock core pure, and the inner pipe assembly and the outer pipe assembly are easily separated.

Description

technical field [0001] The invention relates to the field of coal mine tunnel coring operations, in particular to an operation method for tunnel pressure-maintaining coring equipment. Background technique [0002] my country is not only a big coal producer, but also a big coal consumer. Coal is an important basic energy and raw material for our country. Coal seam gas content and coal seam gas pressure are the main indicators of outburst coal seam outburst risk area prediction and regional effect inspection. Coal seam gas content is usually measured by ground coal seam gas content measurement, geological survey gas content measurement, coal seam drilling and coring in underground mines, etc. Due to the differences in the test conditions and methods of coal seam gas content, the test results of the above coal seam gas content often have large differences and low accuracy, and there are widespread estimation losses, which have limited guiding significance for coal mining. [0...

AI Technical Summary

Problems solved by technology

[0004] In order to further realize the pressure-holding coring of coal seams, there is a coal sampler with the publication number CN201811862U, which relies on mucus and vacuum devices to carry out pressure-holding coring of samples. There is a fluid medium in the above-mentioned devices, which will cause certain damage to the coal seam cores. pollution, and affect the determination of parameters such as moisture content,

[0005] At present, the application number is CN201410739874.9, which is called a sealed coring device for surface drilling coalbed methane and rock formation gas content testing. The heart-sealed ball valve has a complex structure. For different coal seams, different accessories need to be replaced to achieve cutting. The operation is not easy and the work efficiency is low.

[0006]The core remover is usually composed of an inner pipe assembly and an outer pipe assembly, and there is a gap between the inner pipe assembly and the outer pipe assembly, resulting in a relatively high risk of gas leakage High, at present, the blowout box installed on the top of the drill pipe is often used to prevent gas leakage, but there is still gas in the drill pipe, which leads to safety hazards in coring operations.

[0007] The gap between the inner tube assembly and the outer tube assembly will also cause the coring cylinder to easily rotate with the outer coring cylinder. When the external disturbance is large, there may be a large error between the core composition and the actual situation.

[0008] In order to reduce the error caused by rotation, currently used coring devices are often provided with a single-action device between the outer tube assembly and the inner tube assembly to reduce the rotation of the core cylinder, but although the single-action device has anti-rotation effect, it cannot There is still a certain rotation of the coring cylinder, it is difficult to effectively reduce the measurement error

[0009] In the prior art, there are patents such as CN203430457U and CN104481439B. During the coring process, the deformation and movement of some parts change the internal flow path to cause changes in pump pressure, and the alarm signal is judged by monitoring the changes in pump pressure on the ground; the working principle of this mechanism is complex and easy Cause misoperation, resulting in wrong judgments on coring conditions, and cannot fully guarantee the accuracy of coring sampling

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