Reciprocating type sampling method and device for gas content fixed-point sampling

A technology of fixed-point sampling and gas content, which is applied in sampling devices, measuring devices, and undisturbed core extraction devices, etc., can solve problems such as poor drilling stability, accelerated gas desorption of coal samples, and failure to consider gas loss, etc., and achieves improved sampling. Speed, the effect of improving accuracy

Pending Publication Date: 2018-05-04
HENAN POLYTECHNIC UNIV
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  • Abstract
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Problems solved by technology

This method can really achieve fixed-point sampling, but there are the following problems: the sampling time is much longer than the stipulation that the sampling time should not be greater than 5 minutes; The temperature rise of the sample will cause deterioration and accelerate the gas desorption of the coal sample; during the time period between the completion of the drilling construction and the delivery of the coal core pipe to the bottom of the hole, the gas i

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  • Reciprocating type sampling method and device for gas content fixed-point sampling
  • Reciprocating type sampling method and device for gas content fixed-point sampling

Examples

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Effect test

Embodiment 1

[0020] A reciprocating sampling method for fixed-point sampling of gas content, specifically comprising the following steps:

[0021] 1) The hollow drill pipe with the coal core pipe fixed at the front end is drilled in sections according to the predetermined drilling path. Take out together along the inner hole of the hollow drill pipe, and take out the rock formation from the coal core pipe, then push the coal core pipe along the inner hole of the hollow drill pipe to the front end of the hollow drill pipe and fix it, and then drill the hole as planned path for the next section of drilling;

[0022] 2) When the hollow drill pipe is drilled to the predetermined sampling depth, a sealing air bag connected with an inflatable pipeline is installed at the front opening of the coal core pipe, and then the coal core pipe is pushed into the hollow drill pipe along the inner hole of the hollow drill pipe The front end of the coal core tube is fixed, the hollow drill pipe is drilled ...

Embodiment 2

[0025] Such as figure 1 As shown, a reciprocating sampling device for fixed-point sampling of gas content includes a hollow drill pipe 1, a coal core pipe 2 and a coring rod 4; the coal core pipe 2 is a cylinder with one end open, and the outer diameter of the cylinder is the same as The inner diameter of the hollow drill pipe 1 matches; the front end of the inner wall of the hollow drill pipe 1 is provided with a coal core pipe front limit 7 and a coal core pipe rear limit 6 for fixing the coal core pipe 2, and the coal core pipe front limit 7 is a fixed limit, and the rear limit of the coal core pipe 6 is a one-way limit set along the rear; the core rod 4 is a hard drill rod, and the front end of the core rod 4 is provided with a detachable connector 3 , the connector 3 is used to drive the rear limit 6 of the coal core pipe and connect with the coal core pipe 2.

[0026] The inner side wall of the opening of the coal core pipe 2 is provided with an annular groove, and an a...

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Abstract

The invention relates to a reciprocating type sampling method for gas content fixed-point sampling. The method comprises the following steps: 1) performing segmental drilling on a hollow drill rod ofwhich the front end is fixed with a coal core pipe according to a predetermined drilling path; 2) arranging a sealing air bag connected with an inflation pipeline at a front end opening of the coal core pipe when the hollow drill rod is drilled to sampling predetermined depth, pushing the coal core pipe into the front end of the hollow drill rod along an inner hole of the hollow drill rod and fixing the coal core pipe, drilling the hollow drill rod again to sampling length to ensure that a coal sample enters into the coal core pipe, inflating the air bag arranged at the front end of the coal core pipe by utilizing the inflation pipeline, and then sealing the front end of the coal core pipe after the air bag is expanded; 3) taking out the sealed coal core pipe along the inner hole of the hollow drill rod, deflating the air bag and taking the coal sample out of the coal core pipe, and carrying out fixed-point sampling. According to the reciprocating type sampling method and device, the gas content fixed-point sampling efficiency and precision of a coal layer can be greatly improved, and the gas content testing accuracy is improved.

Description

technical field [0001] The invention specifically relates to a reciprocating sampling method and device for fixed-point sampling of gas content, belonging to the technical field of geological drilling. Background technique [0002] At present, the method of directly measuring coal seam gas content underground mainly adopts the desorption method, and the specific process is divided into three steps: 1. Drilling and collecting coal samples in newly exposed coal walls, stone gates or rock roadways; Determination of residual gas content. Among them, the theory of steps 2 and 3 is mature, and the impact on the measured value of gas content can be ignored. Since 1 involves the fixed-point sampling method and the calculation of gas loss, it is the main source of error in gas content measurement. The determination of gas content in underground coal mines must adopt the coal core tube coring method and the fixed-point sampling method based on the orifice sampling method. The bigge...

Claims

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Application Information

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IPC IPC(8): G01N1/08
CPCG01N1/08G01N1/2294E21B25/06E21B49/08
Inventor 李辉魏建平程磊
Owner HENAN POLYTECHNIC UNIV
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