SU883325A1 - Fishing tool for recovering deep-well equipment - Google Patents

Description

I

The invention relates to the oil industry, namely to fishing tools for eliminating accidents with electric submersible centrifugal pumps, pipes or rods.

A known trap includes a housing, inside of which a stem is placed, a spring-loaded sleeve and raincoats, with 4 xerometers interacting with the slots of the housing and with the inner surface of sleeve 1.

The disadvantages of this trap are; the possibility of premature ({mocatsii dies in the released position, as well as the impossibility of using a die for removing objects with a small gap between them and the production column.

S The closest in technical essence and the achieved result to the invention is a safety device for extracting borehole equipment, including a body with a shoulder and a gripping collet, and an axially movable sleeve with locks for locking it in the initial position relative to the body 2.

For such a catcher, the complexity of the design and low operational reliability are characteristic due to the possibility of premature latching. I The purpose of the invention is to simplify the design and increase the reliability of the catcher.

This is achieved by the fact that the sleeve is made with protrusions on the inner surface placed in the slots of the collet, and the retainer is made in the form of

IS of flat springs fixed on the collar to interact with the protrusions of the sleeve, while the collet is mounted with the possibility of axial displacement.

FIG. 2 shows a safety device

20 general view; on fig.Z - section aa in figure 1; figure 4 - section bb in figure 1; on fig.Z - section bb In 4v1g. one.

The safety device includes a housing 1 with a shoulder 2, a collet 3 with stepped slots 4, threaded holes 5 and protrusions 6, a sleeve 7 with protrusions 8, a retainer 9 in the form of a flat spring and a safety coupling half 10.

The safety device works as follows.

On drill pipes or tubing pipes, the safety device is lowered into the well as far as it will go to the upper end of the emergency object and the tool is unloaded. Under the action of an axial load, the collet 3 opens and passes an emergency object, which is picked up by the projections 6 of the collet 3 under the sleeve or flange. After that, the catcher is lifted with a captured emergency object. When lifting, the collet 3 rests on the shoulder of the housing 2 and, when a certain load is reached, depresses the retainer 9, releasing the sleeve 7, which under its own weight moves down along the slots 4, pulling the collet of the collet 3 and preventing their opening.

After removing the emergency object to the surface, the sleeve 7 is set to its original position, and the grips 3 are opened by means of screws, which are screwed into the holes 5, and the emergency object is released.

The coupling half 10 prevents the sleeve 7 from moving upwards when the catcher is lowered into the well.

The proposed safety device provides extraction of emergency objects with small gaps between them and the production string.

Claims (2)

1. USSR author's certificate No. 241357, cl. Е 21 В 31/02, 1968. 2. Lavrushko P.N. Underground well repair. M., Nedra, 1968, p. 270