Hydraulic-expansion recyclable whipstock for directional drilling of underground coal mine and operation method thereof

Abstract

The invention provides a hydraulic-expansion recyclable whipstock for directional drilling of an underground coal mine. The hydraulic-expansion recyclable whipstock comprises a setting device, a setting head 7 and an unsetting device 8, wherein the setting device comprises a guide head 1, a rubber sleeve assembly 2, an inner supporting tube 3, a joint 4, a one-way valve assembly 5 and wedged iron 6. Two ends of the rubber sleeve assembly 2 are fixedly connected with the guide head 1 and the joint 4 respectively, and two ends of the inner part of the joint 4 are fixedly connected with the inner supporting tube 3 and the one-way valve assembly 5 respectively. When the whipstock sets, a drill rod is connected with the whipstock through the setting head 7, high-pressure water is poured into the rubber sleeve assembly 2, a rubber sleeve is expanded to adjoin the hole wall of a drill hole, and finally setting is realized. During fishing, after the unsetting device 8 enters a fishing hole of the wedged iron 6, a jack prop 9 opens the valve core of the one-way valve assembly 5; and meanwhile, a spring clamp 10 in the unsetting device 8 is bounced off, a drilling tool is lifted up, and finally the whipstock can be fished out. The whipstock has the advantages of simple structure and low processing cost, can accurately control the opening direction of a branch pore, and increases the pore forming speed and quality of the branch pore.

Description

technical field [0001] The invention relates to a tool for directional drilling in underground coal mines, in particular to a hydraulically expandable retrievable skewer for directional drilling in underground coal mines into branched wells and an operating method thereof. Background technique [0002] Retrievable tilters have been used in petroleum and geological exploration and development for a long time. Its application scope includes many technical measures such as sidetracking and branching, and the technology is relatively mature. However, there is no precedent for the use of oblique devices in the construction of directional drilling for underground gas drainage in coal mines, and the construction technology and working environment of petroleum and geological exploration drilling are quite different from those of underground gas drainage drilling in coal mines: the diameter of petroleum and geological exploration drilling is generally The borehole is larger than that...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hydraulically expandable recoverable inclined device for directional drilling in underground coal mines and its operating method, so as to solve the problem of limitations in the application of existing inclined devices in underground coal mines

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