Coal seam coring sealing device and sealing coring method thereof

Abstract

A coal seam coring sealing device comprises an inner drill pipe, an outer drill pipe and a power drill pipe which are each of a hollow structure, wherein the inner drill pipe is inserted in the outer drill pipe in a sliding mode; the connecting positions of the inner drill pipe and the outer drill pipe are connected through a sealing sleeve pipe; the bottom end of the power drill pipe is connected with the top end of the inner drill pipe; the outer wall of the sealing sleeve pipe is fixedly connected with the inner wall of the outer drill pipe; air pores communicating with the inside of the outer drill pipe are formed in the pipe wall of the sealing sleeve pipe along the axis and provided with air pore caps; an air bag, three inflation mechanisms and twelve bottom end plugging mechanisms are arranged at the bottom end of the outer drill pipe; the air bag is arranged in the circumferential direction of the bottom end of the outer drill pipe; and the three inflation mechanisms are all connected with the air bag. In conclusion, the coal seam coring sealing device is simple in overall structure, scientific in principle, safe, reliable and capable of greatly reducing the leakage amount of original gas in a coal seam during coring.

Description

technical field [0001] The invention belongs to the technical field of coal seam sealing and coring, and in particular relates to a coal seam coring sealing device and a sealing and coring method thereof. Background technique [0002] There are two better methods for coal seam coring: airtight coring and pressure-holding coring, because it is inevitable to contact with drilling fluid during coring, which will affect the research on the gas of the coal core. The gas in the core of the coal will enter the drilling fluid, and airtight coring can better solve this defect. In the patent document "A Method for Measuring the Gas Content of Coal Seams by Airtight Coring" with the patent application number 201310150259X, the airtight core is used to Sealing is performed, but this method does not take into account gas loss during core drilling. Contents of the invention [0003] In order to solve the deficiencies in the prior art, the present invention provides a coal seam coring s...

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Problems solved by technology

[0002] There are two better methods for coal seam coring: airtight coring and pressure-holding coring, because it is inevitable to contact with drilling fluid during coring, which will affect the research on the gas of the coal core. The gas in the core of the coal will enter the drilling fluid, and airtight coring can better solve this defect. In the patent document "A Method for Measuring the Gas Content of Coal Seams by Airtight Coring" with the patent application number 201310150259X, the airtight core is used to Sealing is performed, but this method does not take into account gas loss during core drilling

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