Drilling tool for down-hole string

Abstract

The invention discloses a drilling tool for a down-hole string. A piston of the drilling tool for the down-hole string is located at the upper portion of a main body in a sealed mode in the axial direction by a shear pin; the upper portion of a cone and a concave platform inside the main body are sealed slidably in the axial direction; a drilling block is fixed on the lower portion of the main body by a pin; the main body, the piston, and the cone form a sealed cavity; the main body is provided with a pressure guiding hole and a drilling hole block groove, a bearing working face of the lower portion of the cone is of a wedge-shaped body or a conical structure, and the drilling block rotates in the axial direction when the pin moves in the radial direction of the main body; and the pin is mounted in the axial direction, and the drilling block can rotate in the radical direction. After the drilling tool for the down-hole string is put into the string or the drilling tool for the down-hole string is downwards placed into the down-hole string by a certain depth adopting cable and steel wire operation and coiled tubing operation, drilling or cutting on the down-hole string can be achieved through pressurization in the down-hole string; compared with the cable operation and the coiled tubing operation, construction is simple and safe, operating cost of the construction is reduced, and the drilling tool for the down-hole string is a breakthrough in drilling or cutting of the down-hole string.

Description

technical field [0001] The invention provides a downhole pipe string perforating tool, which belongs to the field of supporting tools for oil field workover and technology. Background technique [0002] There are many situations where downhole pipe strings in oil fields need to be drilled for construction, such as drilling for oil production pipe strings to drain oil during workover; pipe strings are drilled to establish kill circulation channels; Sand flushing circulation channel; pipe strings need to be cut during workover, and the construction cost of drilling or cutting with cable operation or coiled tubing operation is relatively high. Contents of the invention [0003] The object of the present invention is to provide a downhole pipe string drilling tool. [0004] The piston of the present invention is axially sealed and positioned on the upper part of the main body through shear pins; the upper part of the cone forms an axial sliding seal with the concave platform ...

AI Technical Summary

Problems solved by technology

[0002] There are many situations where downhole pipe strings in oil fields need to be drilled for construction, such as drilling for oil production pipe strings to drain oil during workover; pipe strings are drilled to establish kill circulation channels; Sand flushing circulation channel; pipe strings need to be cut during workover, and the construction cost of drilling or cutting with cable operation or coiled tubing operation is relatively high

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