A method for running casing in long-distance directional drilling

Abstract

The invention discloses a casing casing method for mechanized long-distance directional drilling by using a directional drilling machine. The kilometer directional drilling machine is improved, and the drill bit is replaced with a fixed device with a pulley, which is used to connect the casing and the drill pipe. A casing with an inner diameter of 80 mm is placed on the outer end of the drill pipe, and the casing is cut by an embedded connection method. An annulus is respectively arranged on the tops of both sides of the casing, and the annulus at the top of the casing and the annulus at the top of the drill pipe are connected by a fixing device with pulleys by a string with sufficient strength. When drilling the rig for the second time, bring the string and the fixed device with pulley to the designated position, and release the pulley device. When the drilling rig retreats after the second drilling, put the casing on both sides of the drill pipe and connect it with the string, so that the casing can be pulled forward through the pulley when the drill pipe is retreating, and the mechanization of the directional drilling rig is completed. The process of lowering the casing saves a lot of time and manpower compared with the method of pushing in by workers.

Description

technical field [0001] The invention relates to a casing casing method for long-distance directional drilling applied in casing casing engineering in coal mines. Background technique [0002] In the front of the working face, the stress concentration section of the two sides of the roadway, and the local structural stress concentration section, the borehole is prone to collapse and blockage in a short time, which greatly reduces the effective gas drainage time of the borehole and seriously affects the gas drainage efficiency of the borehole. In order to realize high-efficiency pre-drainage of gas in boreholes in the coal seam, it is necessary to solve the problem of borehole collapse and blockage in a short period of time during the gas drainage process. At present, the method to solve the problem of borehole collapse and blockage in a short period of time in the process of gas drainage is mainly to use casing to protect the borehole to delay the collapse time of the borehol...

AI Technical Summary

Problems solved by technology

At present, the method to solve the problem of borehole collapse and blockage in a short period of time in the process of gas drainage is mainly to use casing to protect the borehole to delay the collapse time of the borehole; The method of setting the casing inside the rod is adopted, and the workers can only push it in manually after the drilling is completed, which is a waste of labor and time

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