RU2280147C1 - Fishing tool - Google Patents

Abstract

FIELD: oil industry, particularly for fishing for or freeing objects in boreholes or wells.

SUBSTANCE: fishing tool comprises hollow body with cylindrical recess made in inner body surface and reversed funnel connected to lower body end. Fishing slips with inclined sections are arranged in the recess. The fishing slips consist of two parts. Fishing slips are pivotally connected with each other from the first sides and are urged inwards by connection compression spring from the second sides thereof.

EFFECT: simplified structure and increased gripping reliability.

2 dwg

Description

The invention relates to the oil industry and is intended to extract tubular elements from the well.

It is known "Downhole fishing device" (patent SU No. 1613578, IPC 7 E 21 B 31/18, publ. BI No. 46 dated 12/15/1990), comprising a housing, ball gripping elements connected to the housing by flexible links, telescopically mounted in the housing and a relative spring-loaded rod with a stop at the lower end, placed on the housing with the possibility of axial movement and interaction in the working position with ball gripping elements, a conical sleeve, the rod in the upper part having means for communication with the rope and a limiter for interacting with on ruling conical sleeve, while the emphasis of the rod is made in the form of a centering cone.

The disadvantages of this design are:

firstly, the complexity of the design, due to the large number of nodes and parts;

secondly, the design allows you to capture and retrieve exclusively equipment having a central channel.

Known "Catcher" (patent SU No. 1707183, IPC 7 E 21 B 31/18, publ. BI No. 3 of 01/23/1992), comprising a hollow body with windows and a conical section on the inner surface, located in the cavity of the die body with inclined sections in the lower part on the outer surface corresponding to the conical surface of the housing, located above the dies and axially spring-loaded relative to the housing, a push sleeve with spring-loaded locking elements installed in the initial position in the housing windows, and on the outer surface in the upper parts of the dies are inclined sections, conical sections are made on the pressure sleeve in the lower part on the outer and inner surfaces, while the conical section on the inner surface is made with a reciprocal inclined section in the upper part of the dies for interaction with the latter in the working position.

The disadvantages of this design are:

firstly, a large number of contacting parts, the sequence of operation of which depends on each other, which reduces the reliability of the device;

secondly, the details of the device, such as a pressure sleeve and dies are difficult to manufacture;

thirdly, the device has a large number of spring elements of various designs, and the breakdown of any of them can adversely affect the performance of the device as a whole.

The objective of the invention is to simplify the design of the device while increasing reliability, as well as accelerating the process of capturing and removing downhole equipment.

This problem is solved by the proposed catcher, including a hollow body with a sample on the inner surface, drawn inward and located in a sample of the hollow body of the die with inclined sections.

What is new is that the hollow body is sampled cylindrical, and the inclined sections of the rams are made on the inner surface, while the rams are pivotally connected on one side and compressed inward by the compression spring connecting them.

Figure 1 shows a catcher in longitudinal section at the time of capture of the equipment extracted from the well.

Figure 2 shows a cross section aa of the catcher.

The catcher consists of a hollow body 1 with a cylindrical selection 2 on the inner surface 3 and a return funnel 4 from the bottom. Inside the sample 2 of the hollow body 1, there are dies 5, the inner surface of which is provided with inclined sections 6. The dies 5 consist of two parts 7 and 8, on the one hand they are connected by a hinge 9, and on the other hand they are pressed inward by a compression spring 10.

The catcher works as follows.

At the wellhead (not shown in FIGS. 1 and 2), the device is assembled. To this end, from above, a load 12 is connected to the hollow body 1 by means of the coupling 11 (2-3 tubing depending on the stiffness of the compression spring 10). Then, a cable head 13 connected to the rope 14 is screwed onto the load 12 from above. The assembled assembly on the rope 14 is lowered into the well until the equipment 15 removed from the well (for example, a part of the pipe or a special extractable valve having a sleeve or fishing neck, respectively) will not fall into the inner space of the hollow body 1 due to the return funnel 4, and then until it contacts the inclined portion 6 of the dies 5 located in the cylindrical sample 2 of the hollow body 1.

Unloading of the device to the equipment 15 removed from the well begins, and the load decreases (weakening the tension of the rope 14), as evidenced by the readings on the weight indicator installed on the geophysical elevator (Figs. 1 and 2).

In the process of unloading the device onto the equipment 15 extracted from the well, the dies 5, consisting of two parts 7 and 8, are moved apart relative to the hinge 9 (see FIG. 2), due to the weight of the load 12, the compression spring 10 is stretched, passing up the equipment 15 removed from the well As soon as the bottom end 16 of the equipment 15 extracted from the well (see Fig. 1), moving upward, passes the inclined section 6, the compression spring 10 is compressed and the dies 5, consisting of two parts 7 and 8, return to their original position. In this case, the lower end 16 of the equipment 15 extracted from the well will be higher than the dies 5. The equipment 15 extracted from the well is captured by the dies 5 (see Fig. 1) and can be removed to the surface.

The proposed catcher has a simple design, thereby increasing the reliability of its work, in addition, it is cheap to manufacture, and tripping operations to capture and remove downhole equipment are carried out by means of a rope, which speeds up the process and reduces the cost of repair work.

Claims (1)

A catcher comprising a hollow body with a sample on the inner surface, pressed inward and located in the sample of the hollow body of the die with inclined sections, characterized in that the hollow body is selected as cylindrical, and the inclined sections of the die are made on the inner surface, while the plates are connected on one side pivotally, and on the other hand, are pressed inward by a compression spring connecting them.

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