Supporting device for coal seam gas extraction drilling and using method thereof

A support device and gas technology, which is applied in the direction of gas discharge, safety devices, mining equipment, etc., can solve problems such as limited support force, influence on gas drainage work, and hole collapse, so as to improve the support effect, prevent hole collapse, The effect of preventing collapse
CN112682094APending Publication Date: 2021-04-20XIAN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN UNIV OF SCI & TECH
Publication Date
2021-04-20

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Abstract

The invention discloses a supporting device for coal seam gas extraction drilling and a using method thereof. The supporting device for coal seam gas extraction drilling comprises a support body and an elastic supporting foot mechanism, wherein the elastic supporting foot mechanism comprises at least two supporting feet hinged to the support body; the support body is provided with a containing groove for containing the supporting feet; and each supporting foot is provided with an elastic piece for controlling the supporting foot to pop out of the containing groove to support a drilled hole and a non-return assembly for preventing the supporting foot from retracting into the containing groove after the supporting foot pops out. The using method of the supporting device for coal seam gas extraction drilling comprises the following steps that the supporting feet retract into the containing groove, the support body is pushed to advance in an opening and closing type drill bit till the support body descends into the drilled hole from the opening and closing type drill bit, the supporting feet pop out of the containing groove outwards to support the drilled hole, and the non-return assemblies are arranged outside the containing groove. The drilled hole can be effectively supported, and hole collapse is prevented. The supporting device is suitable for being used in coal seam gas extraction drilling and used for supporting the drilled hole.
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Description

technical field

[0001] The invention belongs to the technical field of coal seam gas drainage drilling, in particular to a support device for coal seam gas drainage drilling and a method for using the same. Background technique

[0002] Unstable borehole drilling for gas drainage in high gassy soft coal seams is one of the problems restricting efficient gas drainage. In high gassy soft coal seams characterized by soft coal, broken coal rocks, and poor air permeability of the coal seam, the drilling depth of the gas drainage drilling does not meet the standard, the hole formation is unstable, the hole is easy to shrink and deform, and even the hole collapses. These phenomena greatly reduce the gas drainage rate, severely limit the progress of the project, make the gas control effect not obvious, and seriously affect the safe production of coal mines.

[0003] In the prior art, the full-length screen pipe protection hole is often used to improve the stability of the borehole ...

Claims

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