While-drilling hydraulic punching and screen pipe hole protecting construction device and method

Abstract

The invention relates to a punching and hole protecting construction device and method, belongs to the technical field of coal mining, and particularly relates to a while-drilling hydraulic punching and screen pipe hole protecting construction device and method. The device comprises an outer pipe, a movable ring and a limiting control ring, wherein the inner wall of the outer pipe is provided with a hinge group, the movable ring can move in the outer pipe in an axial direction of the outer pipe so as to push the hinge group to be opened, when the hinge group is driven by water pressure to be closed, the movable ring moves in the axial direction of the outer pipe in a closing direction of the hinge group, the limiting control ring is arranged in the outer pipe and is used for limiting an axial movement position of the movable ring, and a channel between a center hole of the movable ring and the limiting control ring is blocked by the hinge group when the hinge group is closed. According to the device, a screen pipe is efficiently lowered in a whole hole section after a broken soft coal seam is drilled and hydraulically punched, the problem that the screen pipe is possibly not lowered to an original hole in distributed construction is solved, and a gas extraction effect is improved.

Description

technical field [0001] The invention relates to a construction device and method for punching and hole protection, belonging to the technical field of coal mining, in particular to a construction device and method for drilling hydraulic punching and screen pipe protection holes. Background technique [0002] Broken and soft coal seams have the characteristics of soft coal quality, poor cementation, and easy collapse. How to improve the gas drainage effect of broken and soft coal seams has always been the research direction of industry researchers. [0003] Drilling is the fundamental way to control gas in coal mines. In recent years, with the development of underground drilling technology and equipment in coal mines, hydraulic punching while drilling technology achieves pressure relief and permeability enhancement in coal seams by partially expanding the diameter of coal seam sections, and is widely used in production. Practice has proved that it is an effective technical me...

AI Technical Summary

Problems solved by technology

[0010] Method (1) Due to the collapse of the local hole section of the borehole, the lowering depth of the screen cannot be guaranteed, thus affecting the gas drainage effect; Due to the influence of the coal seam’s own characteristics and the gravity of the sweeping drilling tool, it is easy to drill a new hole, causing the original hole to be scrapped, and the screen pipe lowered through the inner through hole of the sweeping drilling tool is not lowered into the original drilling hole, thus affecting Gas drainage effect; on the other hand, even if the hole can be swept along the original hole to the bottom of the hole, it is still necessary to lift and lower the drilling tool, which increases the labor intensity of workers and reduces the construction efficiency; on the other hand, the construction site needs to be equipped with High-pressure sealing drilling tools for hydraulic punching while drilling and sweeping drilling tools for lowering screen pipes increase the purchase cost of coal mine materials and the site space for storing drilling tools

[0011] Therefore, how to solve the problem of how to efficiently and smoothly lower the screen pipe in the whole hole section after the hydraulic punching of the broken soft coal seam has become the key to restricting the further improvement of the gas drainage effect. The integrated construction of the hole and the screen pipe protection hole of the full hole section innovates the drilling construction technology of the broken soft coal seam to solve the problem that the channel is blocked after the hydraulic punching drill is lifted and the full hole section cannot be efficiently lowered into the screen pipe, and further improves the gas extraction. mining effect

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