SU898041A1 - Pipe-fishing device for wells - Google Patents

Description

(54) BOTTOM PIPE

The invention relates to fishing devices used in oil wells, namely, external die packs of the mechanical type.

The known trap includes a body with a guide funnel, a gripping unit in the form of an axially movable sleeve with dies and a release mechanism in the form of retainers interacting with projections on the outer surface of the sleeve 1.

The disadvantages of it are low reliability and complexity of the design.

The closest in technical essence and the achieved result to the invention is an external die-cutter comprising a body with an annular collar on the inner surface, a gripping mechanism mounted on an annular collar, and a release unit cooperating with it in the form of a screw pair 2.

This trap has insufficient reliability in operation when used in small wells, where, due to the severely limited thickness of the shell walls, it is impossible to create a reliable tool.

The purpose of the invention is to increase the reliability of operation of the die in small wells.

The goal is achieved in that the gripping mechanism is made in the form of radially spring-loaded half-rings with inclined grooves on the outer surface, and the release unit is provided with a spring-loaded sleeve with leads installed in the conical grooves of the half-rings with the possibility of axial relocation.

FIG. 1 shows the proposed labor head, general view, initial position; in fig. 2 - the same at the time of capture; in fig. 3 is a section A-A in FIG. one; in fig. 4 is a section BB in FIG. one; in FIG. 5 is a sectional view BB in FIG. one; in fig. 6 is a section t5 of the FIG. 2

Claims (2)

The pipe includes a housing 1, inside which a guide cup 2 with a notched end is mounted for locking it when seated on a sleeve of retrievable pipes. Between the housing 1 and the cup 2, there is a sleeve 3, which is connected to the body 1 by means of a key 4, and with the cup 2 by a thread, forming a screw pair with it. The sleeve 3 with the end gear is connected with a spring-loaded sleeve 5, made with stops 6 and grooves 7 and interacting with the leads 8, the lower ends of which are made with wedge surfaces 9. The screw pair together with the sleeve 5 and the leads 8 form a release unit. On the annular collar 10 of case I, a gripping mechanism is installed, made in the form of radially movable half-rings 11, between which flat springs 12 are installed, due to the elasticity of which the half-rings 11 are pressed in their original position against the inner surface of the case 1. On the outer surface of the half-rings 11 there are inclined grooves 13, designed to interact with the wedge surfaces 9 of the leads 8. To prevent the springs 12 from falling inside the tubing, during the installation of them on the lateral ends of the semirings 11, protrusions 14 are made which enter into The corresponding undercut 15 of the adjacent semiring. At the bottom end. the housing 1 has a guide funnel 16 for guiding and centering the emergency string, and at the upper end a sub 17 for connecting the die to the drill string. The tip works as follows. On the collar of drill pipes, the die is lowered into the well and, having covered the funnel 16 with the coupling of the emergency pipe, slowly drove it into the cavity of the housing 1. Having placed the cup 2 on the coupling, the drill pipes are rotated. At the same time, the cup 2, due to braking with the toothed end, stops the sleeve 3, having received a rotational movement from the housing 1, moves down together with the sleeve 5 and the leads 8. The wedge surfaces 9 of the leads 8, moving along the inclined grooves 13, compress the half-rings 11 in the radial direction to grip the column under the sleeve. Rotation of the trap stop and begin lifting. When lifting, the lower end of the emergency column coupling sits on half rings 11, which perceive the resulting axial force. The release of the pipe from the emergency column is carried out as follows. The small pipe is put on the emergency column coupling and turned half a turn in the opposite direction. In this case, the cup 2 remains stationary, and the sleeve 3 turns the sleeve 5 to align its grooves 7 with the leads 8. As a result, the spring-loaded leads 8 pass through the grooves 7, and their lower ends exit the inclined grooves 13. The flat springs 12 unclench the half rings , 11 and press them to the inner wall of the housing 1. The diameter of the through-hole of the die increases and the coupling of the emergency column freely passes through the semirings 11.t The use of the proposed die increases the reliability of pipe extraction in small wells. The invention The borehole piercing, comprising a housing with an annular collar on the inner surface, a gripping mechanism mounted on the annular collar, and a release unit cooperating with it in the form of a screw pair, characterized in that, in order to increase the reliability of its operation in small wells, the mechanism the gripper is made in the form of radially spring-loaded half-rings with inclined grooves on the outer surface, and the release unit is equipped with a spring-loaded sleeve with leashes installed in the conical grooves of the half-rings axially movable. Sources of information taken into account in the examination 1. US patent number 3393002, cl. 294-86. .23, published 1968. 2. USSR author's certificate number 549572, cl. E 21 V 31/02, 1972 (prototype). ig. I Rig.2 - BB FIG. 3 not C YY Rig. | 5 ig.B