Closed coring device for testing coal bed methane and rock formation gas contents in surface well drilling

A surface drilling and sealed coring technology, which is applied in the direction of extracting undisturbed core devices, earthwork drilling, wellbore/well components, etc., can solve problems such as inaccurate measurement of coalbed methane content, gas loss, and inability to realize fixed-point collection of samples, etc.
CN104453759AActive Publication Date: 2015-03-25XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
Publication Date
2015-03-25

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Abstract

The invention discloses a closed coring device for testing coal bed methane and rock formation gas contents in surface well drilling. The closed coring device comprises a coring inner barrel, a coring drill bit, an outer barrel, a power mechanism and a startup mechanism, wherein the outer barrel sleeves the coring inner barrel; a drill rod joint is arranged at one end of the outer barrel; the coring drill bit is arranged at the other end of the outer barrel; the power mechanism and the startup mechanism are arranged inside the outer barrel. The closed coring device can take a coal (rock) core sample in a fixed-point and closed way, effectively solves the technical problems that after the existing coring equipment takes a coal core, the exposure time of the sample is long, escape of lost gas is serious, content determination on gas (coal bed methane) is not accurate and the like, and further, provides more reliable basic data for coal mine gas disaster control, exploration and exploitation of coal bed methane resources, and the like.
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Description

technical field

[0001] The invention belongs to the technical fields of coal mine safety and coal bed gas exploration and development, and specifically relates to a sealed coring device for testing the content of coal bed gas and rock bed gas in ground drilling. Background technique

[0002] Coalbed methane (gas) content is an important parameter to characterize coal reservoirs, and is an important basis for surface coalbed methane (gas) resource exploration, productivity prediction and well pattern layout design; It is an important basis for output prediction, coal seam gas occurrence law research and coal seam outburst risk prediction, mine ventilation design and equipment selection, and gas drainage engineering design. Therefore, research on coring equipment for accurate determination of coalbed methane (gas) content has important practical significance in the exploration and development of coalbed methane resources and the management of underground gas disasters in coal ...

Claims

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