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

Pending Publication Date: 2021-04-20
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can realize the support and positioning of the borehole to a certain extent, in actual use, since the suspension fins are usually connected to the suspension body by torsion springs to realize the pop-up and retraction of the suspension fins, the suspension fins after ejection The support force of the sheet in the borehole is limited, and the suspension fins in the pop-up state are easily retracted into the suspension body under the action of the elastic force of the torsion spring due to the deformation of the borehole, and cannot play an effective supporting role in the borehole , causing hole collapse and affecting gas drainage work

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 A support device for coal seam gas drainage drilling

[0027] In this embodiment, by setting the non-return assembly on the leg 2, when the leg 2 pops out of the drill hole for support, it can effectively prevent the leg 2 from shrinking and recovering in the receiving groove 3, and the supporting position of the leg 2 is fixed to play a role in the drilling. Effective support.

[0028] Such as Figure 1 to Figure 3 As shown, this embodiment includes a bracket main body 1, an elastic foot mechanism and a non-return assembly.

[0029] The bracket main body 1 is a cylinder, the front end of the bracket main body 1 is provided with a conical boss, and the rear end of the bracket main body 1 is provided with a groove, so as to facilitate the transportation and lowering of the bracket main body 1 . The bracket main body 1 is provided with at least one set of elastic leg mechanisms at intervals along the axial direction. In this embodiment, two sets of elastic leg...

Embodiment 2

[0033] Example 2 A method of using a support device for coal seam gas drainage drilling

[0034] This embodiment utilizes the coal seam gas drainage drilling support device in Embodiment 1 to cooperate with the open and close drill bit to realize, including the following steps:

[0035] Such as Figure 4 As shown, the supporting device for coal seam gas drainage drilling is put into the open and close drill bit 9, and under the restriction of the inner wall of the open and close drill bit 9, the support feet 2 are shrunk in the storage groove 3 in the bracket main body 1; Restricted by the groove 3, the spring 6 of the non-return assembly is in a contracted state, so that the first connecting rod 7, the spring 6 and the second connecting rod 8 are limited in the non-return hole 5 of the leg 2, that is, the retracted position of the non-return assembly is in contact with the leg. 2 corresponding to the retracted position.

[0036] Push the bracket main body 1 to advance towar...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B41/00
Inventor 张超刘超黄晓昇范富槐雷晨李鑫王星龙曾祥真杨朴超陈浩成铭张爱琳
Owner XIAN UNIV OF SCI & TECH
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