Slim-hole hydraulic controlled reducing reaming bit

Abstract

The invention relates to a small-hole hydraulic controllable variable-diameter hole dilating drill with, mainly solving problems that the diameter keeping ability of variable-diameter drill is bad and it is difficult of draw the drill in body. it is characterized in that the upper end of pilot drill (1) is connected with the main body (2); on the water eye in pilot drill (1) a ball valve (3) is set; under the stage of valve bar (4) of ball valve (3) a connecting sleeve (5) with radius flow channel is mated; the upper end of connecting sleeve (5) is connected with the hollow piston (6) in the main body (2); a tool body (8) is set in oblique slide slots towards two sides in three long pores on the wall of main body (2); there is a water eye (9) at the position of piston (6) which is faced to the lower end of tool body (8); the tool body (8) is contacted with the piston (6). The hole dilating drill is provided with good diameter keeping ability, reliable retraction of tool body and long service life.

Description

Technical field: [0001] The invention relates to a reaming drill bit used in the field of oil field drilling, in particular to a hydraulic controllable slim hole reaming drill bit with variable diameter. Background technique: [0002] In the field of oil field drilling, re-drilling of old wells includes sidetracking of old wells and deepening of old wells, the purpose of which is to improve the development efficiency of old oil fields at a lower production cost. In sidetracking and deepening of old wells in casing, it is of great significance for overhaul of casing damaged wells and deep oil and gas development. The most prominent problem in the re-drilling of old wells is the short life of the production well. The main reason for the short life of the production well is the poor cementing quality, and the main reason affecting the cementing quality is the annular gap between the liner and the wellbore Small. If you want to increase the annular gap, you have to ream the ho...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of existing reaming drills, such as poor diameter keeping performance and difficulty in retracting into the tool body, the present invention provides a hydraulically controllable variable diameter reaming drill for slimholes. The reaming drill not only has good diameter keeping performance during operation , the retractable performance of the cutter body is reliable, the service life is long, safe and reliable, and it has a hydraulic alarm function, which is easy to operate and maintain.

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