SU1745874A1 - Device for elimination of casing collapse downhole - Google Patents

Abstract

The invention: the device contains a conical pusher and a conical body, telescopically mounted and fixed by the shear element in the initial position. The body has spiral grooves located along a helix and support balls installed in them. The conical pusher is made with evenly spaced around the circumference of the longitudinal grooves. In the case of a pull, the tensioning force of the pipe string connected to the pusher cuts the locking elements, the pusher moves up, the support balls go into the body and it is released from the sticking. 3 il.

Description

The invention relates to the oil and gas industry, namely, devices for eliminating sm of tubing string in a well.

The purpose of the invention is to increase the reliability of the device while eliminating sm of casing of production and intermediate casing pipes in wells and to increase the service life of the device.

FIG. 1 shows the device in the working position; in fig. 2 - device in emergency mode; in fig. 3 - section A-A of FIG. one.

The device consists of a string of drill pipe 1. a conical pusher 2, a shear element 3, a half-coupling 4, a conical body 5, support balls 6, a half-coupling 7.

In the pusher 2, the bottom, carrying axial loads, part of which is made conical, in the form of longitudinal grooves a, which form evenly around the circumference. The middle cylindrical part of the conical pusher 2 has holes b for the entry of the shear elements 3, which keep it from axial displacement.

The upper part of the pusher is equipped with a coupling half 4 for transmitting torque to the conical body 5 and a thread for connecting to the base of the drill string 1. The conical body 5, which is also the mount for the support balls 6, has a conical shape both inside and outside the same taper angle as the lower part of the elongated body 2. Support balls 6 are placed in through radial grooves F, located along a helical line and in a staggered order, and protrude beyond the dimensions of the conical body 5 by a quarter of the diameter of the ball. The top of the conical body 5 is rigidly connected by welding with the coupling half 7, intended for sensing the torque. Support balls 6 installed in the through radial grooves G, spaced

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Rug from each other at an angle and rest on the longitudinal grooves of a and a conical pusher 2.

The device works as follows.

The device is lowered into the well by means of a string of drill pipe 1 to an interval in violation of the casing geometry. The drill string, together with the device, is driven into rotation by the rotor and the force of the weight of the drill pipe string at a predetermined flow is corrected in that region.

Since the support balls 6 are located in the conical case 5 along a helical line, the diameter of the circle of rotation described by each subsequent ball increases with respect to the first one by a very small amount, calculated in microns. With such a smooth expansion of the barrel of the deformed section of the column in the process of rotation and translational downward movement of the device, the rotor torque gradually increases. After work is completed, the device is lifted with rotation in the same direction.

In the case of a sticking device, as shown in FIG. 2, the shear elements 3 are cut by the tension of the drill pipe string 1 and the conical pusher 2 extends up to the bottom of the lower conical part with the coupling half 7, as a result of which the support balls 6 go deeper into the conical body and the device is free from sticking.

When performing the release from sticking, no great effort is required to tension the drill pipe string 1, since the support balls 6 turn, i.e. sliding friction is replaced by rolling friction.

No formula

A device for eliminating the seepage of a pipe column in a well, including a conical body with a large base in the upper part and radial grooves, support balls located in the radial grooves of the body that can be rotated, in order to improve the reliability of the device during operation. casing elimination

production and intermediate columns in the wells and increase the service life of the device, the radial grooves of the body are made through and arranged along a helical line, the body has one conical pusher fixed in its initial position by shear elements with a large base in the upper part and evenly spaced

longitudinal grooves, with support balls placed in the latter.

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Claims (1)

Claim A device for eliminating the collapse of a pipe string in a well, including a conical body with a large base in the upper part and radial grooves, support balls located in the radial grooves of the body with the possibility of rotation, if so, in order to increase the reliability of the device during the elimination of crushing casing pipes of production and intermediate strings in the wells and increase the service life of the device, the radial grooves of the body are made through and located along a helical line, the body has a telescopic mount copulating in it and fixed in the initial position via shear elements tapered pusher with a large base to the upper part and evenly distributed along the circumference longitudinal grooves, wherein the bearing balls are arranged in the latter. FigZ Fig.Z