Slim-hole hydraulic controlled reducing reaming bit

Abstract

A small hole hydraulic controllable variable diameter reaming drill bit. The invention mainly solves the problems that the existing reaming drills have poor diameter-keeping performance and are difficult to retract into the tool body. It is characterized in that: a main body (2) is connected to the upper end of the pilot drill bit (1), a ball valve (3) is arranged on the upper seat of the water hole in the pilot drill bit (1), and a ferrule under the step of the valve stem (4) of the ball valve (3) has a diameter. To the connecting sleeve (5) with overflow channel, the upper end of the connecting sleeve (5) is connected with the hollow piston (6) in the main body (2). A cutter body (8) is built in, a water eye (9) is provided on the piston (6) corresponding to the lower end of the cutter body (8), and the cutter body (8) is in contact with the piston (6). The reaming drill has the characteristics of good diameter keeping performance, reliable retraction performance of the cutter 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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