Construction method of large-diameter high-position directional long drilling in double-branch roof

Abstract

A construction method and supporting drilling tools for a large-diameter high-position directional long hole on a double-branch roof, the directional long hole includes a sealing casing section, a layer-penetrating hole section, and a double-branch extraction hole section, and the layer-penetrating hole section Contains the S-shaped profile trajectory segment between the coal seam of the working face and the roof fracture zone. The method is to firstly construct the casing section for sealing the hole, and fix the hole with the lower pipe; then construct the small-diameter pilot hole for reaming in the layer-piercing hole section and the upper branch, and drill the enlarged diameter hole; Sidetracking in the section, forcibly opening small-diameter branches, constructing pilot holes and drilling enlarged diameter holes. The invention can greatly reduce the number of openings, reduce the amount of auxiliary engineering, improve the comprehensive construction efficiency and the utilization rate of high-level drilling holes, and is beneficial to improve the pressure relief gas drainage effect. The matching drill bit is equipped with sidetracking sub-pillar teeth, which can impact-cut the lower side wall of a large-diameter hole under the action of gravity, quickly build steps, and hang sidetracking small-diameter branches. The directional drilling process has the same function as the conventional directional drill bit. .

Description

technical field [0001] The invention relates to a construction method of a large-diameter high-position directional long drill hole on a double-branch roof and a matching drilling tool, in particular to utilizing the curvature difference between the ideal hole wall section circle of a large-diameter hole and the theoretical cutting circle of a small-diameter sidetrack branch drill bit, A construction method and supporting drilling tools for double-branch roof large-diameter high-position directional long drilling by means of a sidetracking branch drill bit suspended in a large-diameter hole after reaming, forcibly opening a small-diameter directional branch hole, and reaming. Background technique [0002] In mines that exploit a single coal seam or coal seam group, during the mining process of the working face, the coal seam and adjacent layers release a large amount of pressure relief gas, which will accumulate in the goaf, upper corner and roof crack zone of the working fac...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a construction method for large-diameter high-position directional long drilling on the double-branch roof and the supporting drilling tools, which can effectively overcome the problem of drilling a single drainage channel without branches in the prior art. In the case of clusters, the number of holes is large, the workload of sealing holes, lower hole casings, and post-hole protection is heavy, the holes in the penetration section are easy to channel, and the quality of hole formation is difficult to control.

Images