SU964098A1 - Stabilizer - Google Patents

Description

(54) STABILIZER

one

The invention relates to the drilling of a well, specifically, the layout of the lower part of the drill string.

A device for preventing borehole distortion is known, which includes conventional drill pipes with a casing which is a stabilizer fl.

However, this device, without having restrictive contact with the borehole wall, allows the bit to move from the vertical axis of the ticking axis and distort the borehole.

Closest to the present invention, there is a stabilizer comprising a cylindrical body having a radius that is variable along 5 perimeter of the body and connecting threaded sections 2J.

This design does not provide the effectiveness of limiting bit displacement from the vertical axis of the well.

The purpose of the invention is to increase the effectiveness of limiting bit displacement from the vertical axis of the well.

This goal is achieved by the fact that a part of the perimeter of the body is fulfilled with a radius greater than the radius of the well, and constitutes a sector equal to 18 ° -2.cL, where 90 °.

FIG. 1 shows a stabilizer in a drill string assembly; in fig. 2, section A-A in FIG. one.

The stabilizer includes an iltadric body 1, part of the perimeter of which is made with a radius R greater than the radius of the well. The remaining part of the perimeter of the body includes a cylindrical part, executed with a radius V equal to the radius of the drill pipe, and a cylindrical transition section made with a variable radius, the value of which varies from radius R to V-. The stabilizer body has connecting threaded portions 2 and 3 for installation in the drill string assembly.

The part of the perimeter of the body, made with a radius greater than the radius of the well, constitutes a sector equal to 180-26, where oL O. The stabilizer is installed at some distance from the bit 4 and is connected to it with extension 5. During the descent of the assembly due to the sector with a cylindrical surface formed by the radius R, the stabilizer is displaced relative to the axis of the well by an amount B and pressed against the wall of the square at the points & and c. The stabilizer housing displaces relative to the axis the axis of the upper part of the extension 5 connected to it, at the lower end of which the chisel is attached. Thus, the extension 5 is inclined in the well and when the tool rotates, it changes its direction around the circumference at each instant, thereby limiting the bit displacement from the vertical

drip axis of the well.

Technical and economic efficiency Information sources,

is to reduce the material attributes taken into account in the examination

the cost of drilling the well due to pre-1. USSR author's certificate

preventing deviation of a well from ver- 25.25509O, cl. E 21 B 7/10, 1967.

tic axis and warning occurred. 2. USSR author's certificate

Claims (2)

the nature of accidents associated with wedging № 732487, cl. Е 21 В 17/10, 1978. chisels and stabilizer body in the well. Claim 1. Stabilizer comprising a cylindrical body having a variable radius along the body and connecting threads, characterized in that, in order to increase the effectiveness of limiting bit displacement from the vertical axis of the well, a part of the body perimeter is made with a radius greater than the well radius. 2. A stabilizer according to claim 1, about a tl, which is due to the fact that, a part of the perimeter of the body is made with a radius of,. large well radius, is a sector equal to 180 ° -2 ° /, where.