Cylindroid telescopic reducing drilling tool

Abstract

The invention relates to a cylindroid telescopic reducing drilling tool and belongs to the field of downhole tools for petroleum wells. The cylindroid telescopic reducing drilling tool comprises a shell, a guiding pipe, a positioning sleeve and a throttling sleeve, the shell sleeves the guiding pipe, step-shaped conical projections are arranged in the middle of the guiding pipe, the throttling sleeve is mounted at one end of the guiding pipe in a threaded manner, and the other end of the throttling sleeve is in contact connection with a connection head. The cylindroid telescopic reducing drilling tool is compact in structure, high in working reliability and capable of solving the problems that in an existing well drilling process, a traditional stabilizer used for controlling a well track and preventing well inclination is structurally fixed, is frequently affected by strata conditions, construction technologies and the like and is difficult in controlling and performance characteristic changing on the ground, and a diameter-variable stabilizer is complex in structure, high in manufacturing cost and low in reliability; the cylindroid telescopic reducing drilling tool can be applied to well drilling construction for large-displacement wells, directional wells and straight wells, efficiency can be improved, and great economic benefit and social benefit can be provided.

Description

technical field [0001] The invention relates to an elliptical cylinder telescopic and variable-diameter drilling tool, which belongs to the field of petroleum downhole tools. Background technique [0002] During the drilling process, in order to control the well trajectory and prevent well deviation, a stabilizer is usually installed on the drill string. The traditional stabilizer is often affected by the formation conditions and construction technology due to its fixed structure, and it is difficult to control and change it on the ground. Its working characteristics require frequent replacement of the stabilizer, and the replacement of the stabilizer must be realized by stopping the drill and tripping the drill. Frequent drilling stops and trips not only affect the drilling timeliness and prolong the drilling cycle, but also may cause stuck tripping, resistance when tripping in and "piston pulling" during tripping, and even accidents such as well collapse and blowout , so ...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a simple and compact structure with good practicability, so as to solve the problem that the traditional stabilizer used for controlling wellbore trajectory and preventing well deviation in the existing drilling process is often affected by formation conditions and construction due to its fixed structure. Due to the influence of technology, it is difficult to control and change its working characteristics on the ground, and the structure of the variable diameter stabilizer is complicated, the manufacturing cost is high, and the reliability is not high; thus, it can realize anti-deviation and fast drilling, effectively control the well trajectory and prevent the occurrence of wells. Inclined elliptical column type telescopic variable diameter drilling tool

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