Self sealed self decompressed coal seam sampling method and apparatus

Abstract

The invention relates to a self-sealing and self-decompressing coal seam sampling method and a device thereof, which comprises the steps as follows: (1) a sampler is arranged ready; (2) when a sampling drilling bit drills into a coal seam, a coal sample goes into the front end of a piston of a sampler and repeatedly extrudes the piston to squeeze the sealing liquid through a liquid outlet of an inner tube of the sampler into a gap between the inner tube and an outer tube of the sampler, the coal sample is penetrated, enwrapped and solidified through the gap between the sampling drilling bit and the inner tube to form the front end sealing of the coal sample; (3) when the piston crushes a brittle baffle inside the sampler, coal sampling is completed, and the gas borne by the coal sample automatically butts against the piston to continue to move backwards until an unidirectional valve of the piston is opened for pressure relief, and the gas which enters a vacuum tube of the sampler is absorbed by the absorbing material in the vacuum tube; and (4) when the absorption is completed, the coal sample and the absorbing material are taken out, and the conventional gas content measurement and calculation are conducted. The coal seam sampling method and the device can be widely used in sampling processes for various coal gas content measurements.

Description

technical field [0001] The invention relates to a coal seam sampling method and a sampling device, in particular to a high-fidelity self-sealing and self-decompression coal seam sampling method and device. Background technique [0002] Coal mine gas is one of the main factors threatening the safe production of coal mines. In order to ensure safe production, the state requires accurate measurement of coal seam gas content. The commonly used indirect determination method of coal seam gas content is based on the original gas pressure of the coal seam, the coal adsorption constant value measured in the laboratory and the industrial analysis results, and the Langmuir equation is used to calculate the gas content. The key of this method lies in the accurate measurement of underground coal seam gas pressure, but the original gas pressure measurement process of coal seam is more complicated, such as selection and arrangement of measuring points, sealing process, treatment of various...

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Problems solved by technology

The key of this method lies in the accurate measurement of underground coal seam gas pressure, but the original gas pressure measurement process of coal seam is more complicated, such as selection and arrangement of measuring points, sealing process, treatment of various gas leakage links, etc., no matter which link is handled carelessly Leading to invalid or unreliable pressure measurement results; no matter it is active pressure measurement or passive pressure measurement, the pressure measurement time is more than several days, and the measurement period is long; the measurement requires on-site construction drilling and pressure measurement drilling, and special equipment is required. Sealing equipment and materials, etc., also need to be tested and analyzed in the laboratory, which requires a large amount of engineering and high cost; on the other hand, the method of directly measuring the gas content of coal seams is to take out the coal core from the deep part of the coal seam through sampling boreholes, and timely Put it into the coal sample cylinder and seal it, and then calculate the gas content in the coal sample

At home and abroad, many equipments for directly taking drilling powder to measure the gas content have been developed, such as ordinary single-layer sampling pipes and double-layer sampling pipes. The popularization and application of gas, the measured gas content is generally low, which is not conducive to the implementation of gas prevention and control measures

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