A variable-diameter stabilizer that can be controlled on the ground

Abstract

The invention belongs to the technical field of a downhole tool and particularly relates to a variable-diameter stabilizer capable of being controlled on the ground. The variable-diameter stabilizer comprises a pipe-shaped shell, wherein a central shaft is arranged in the shell; a self-locking groove is formed in the upper part of the central shaft; a tapered sleeve sleeves the middle part of the central shaft; a locking block square hole is formed in the upper part of the shell; a self-locking device is arranged in the locking block square hole; the inner end of the self-locking device corresponds to the self-locking groove in the central shaft; a plurality of cylindrical holes are uniformly formed in the shell along the peripheral direction and the axial direction; stabilization columns are arranged in the cylindrical holes; the inner ends of the stabilization columns are located on the outer wall of the tapered sleeve. According to the variable-diameter stabilizer capable of being controlled on the ground, the aim that the stabilizers with different outer diameter sizes are utilized in different well sections is realized. Meanwhile, the outer diameter conversion is realized by different ground operations and a control unit does not need to be specially and additionally arranged; the link that an existing non-electric-control variable-diameter stabilizer needs to control pump pressure or count the times of switching on and off a pump is overcome; the operation is simplified, the structure is simple, the operation is convenient and the well drilling timeliness is improved.

Description

technical field [0001] The invention belongs to the technical field of downhole tools, and relates to a variable stabilizer used in oil drilling directional wells, horizontal wells and extended displacement drilling operations, in particular to a variable diameter stabilizer that can be controlled on the ground. Background technique [0002] In the drilling construction of directional wells, horizontal wells and extended-reach wells, in order to control and adjust the wellbore inclination, it is usually stabilized by using drill pipes of different sizes and lengths, weighted drill pipes, drill collars, etc. Drill tool assembly for deflection building, deflection stabilization or deflection declination. [0003] Conventionally used drill stabilizers are integral, and the diameter is fixed and cannot be changed, generally 2mm smaller than the drill bit, which has four main disadvantages: [0004] 1. When the tripping is not smooth, it is easy to encounter obstacles and jams, ...

AI Technical Summary

Problems solved by technology

[0004] 1. When the tripping is not smooth, it is easy to encounter obstacles and jams, which will induce drilling accidents;

[0005] 2. When the diameter wears down to a certain extent, it will all be scrapped, which increases the drilling cost;

[0006] Three, when the enlarged wellbore section works, the drill pipe cannot be effectively stabilized;

[0007] Fourth, because the adjustment period is long, the wellbore trajectory will show a "fluctuating" type, which will generate additional torque and resistance. Conventional drilling tools cannot adapt to the current complex drilling technology requirements such as directional wells or horizontal wells.

[0008] Moreover, using the traditional fixed stabilizer, because of its fixed structure, the replacement of the stabilizer must be realized by tripping, which increases the auxiliary time of drilling operations

When the fixed stabilizer is used in tripping and directional working conditions, there are technical problems such as reaming when encountering resistance, deflection prevention in easily deviated formations, wellbore trajectory control in directional wells, and increased mechanical speed, which may easily cause scraping of the wellbore wall and The "piston pulling" phenomenon increases the soaking time of the mud on the well wall, prolongs the drilling construction period, reduces the drilling efficiency, and even causes the well wall to become unstable, resulting in complex downhole accidents such as well collapse and blowout

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