RU46294U1 - Borehole fishing device - Google Patents

Abstract

The proposal relates to the oil industry and is intended to extract tubular elements from the well. The catcher consists of a hollow body with a cylindrical selection on the inner surface and a return funnel from the bottom. Inside the cylindrical sample of the hollow body, there are dies consisting of several, for example, two parts, which are pressed inward by the elastic element covering them (for example, a spring split ring). The inner surface of the dies is provided with inclined sections. The proposed downhole fishing device has a simple structure, cheap to manufacture, while its efficiency does not decrease, and the hoisting and grabbing and capturing operations of the downhole equipment are carried out by means of a rope, which speeds up the process and reduces the cost of repair work.

Description

The proposal relates to the oil industry and is designed 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 casing and a relative spring-loaded rod with a stop at the lower end, placed on the casing 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 railing 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 design allows you to capture and retrieve only equipment having a central channel;

secondly, the complexity of the design, due to the large number of nodes and parts.

Known "Catcher" (patent SU No. 1707183, IPC 7 E 21 B 31/18, publ. BI No. 3 of 01/23/1992), including 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 Asti dice inclined portions formed on the pressing sleeve are conical sections the bottom of the outer and inner surfaces, wherein the conical portion is formed on an inner surface mating with the inclined portion of the top of the dies for interaction with the latter in the operative position.

The disadvantages of this design are:

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

secondly, the device has a large number of spring elements, and failure of any of them can adversely affect the operability of the device as a whole.

The objective of the utility model is to simplify the design of the device without loss of operating efficiency, as well as accelerate the process of capturing and removing downhole equipment.

This problem is solved by the proposed downhole fishing device, comprising a hollow body with a sample on the inner surface, drawn inward and located in the sample body dies with inclined sections.

What is new is that the sample of the hollow body is cylindrical, and the inclined sections of the dies are made on the inner surface, while the dies are pressed inward by the elastic element enclosing 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 a downhole fishing device.

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 cylindrical sample 2 of the hollow body 1, there are dies 5, consisting of several, for example, two parts 6 and 7, which are pressed inward by the elastic element 8 covering them (for example, a spring split ring). The inner surface of the dies 5 is provided with inclined sections 9.

Downhole fishing device operates as follows.

At the wellhead (not shown in FIGS. 1 and 2), the device is assembled. For this purpose, the load 11 is connected from above to the hollow body 1 by means of the coupling 10 (2-3 tubing depending on the stiffness of the elastic element 8). Then, a cable head 12 connected to the rope 13 is screwed to the load 11 from above. The assembled assembly on the rope 13 is lowered into the well until the equipment 14 extracted from the well (for example, a part of the pipe or a fishing “head” of the removed valve) enters the inner the space of the hollow body 1 due to the return funnel 4, and then to contact with the inclined sections 9 of the dies 5 located in the cylindrical sample 2 of the hollow body 1.

Unloading of the device to the equipment 14 removed from the well begins, and the load decreases (the tension of the rope 13 decreases), as evidenced by

the indication of the weight indicator installed on the geophysical elevator (not shown in FIGS. 1 and 2).

In the process of unloading the device to the equipment 14 extracted from the well, due to the weight of the load 12, the elastic element 8 (see figure 2) is opened, while the dies 5, consisting of two parts 6 and 7, are moved apart, passing up the equipment 13 extracted from the well.

As soon as the bottom end 15 of the equipment 14 extracted from the well (see Fig. 1), moving upward, passes the inclined sections 9, the elastic element 8 will return to its original position, compressing the inside of the die 5, consisting of two parts 6 and 7. At the same time, the lower the end face 15 of the equipment 14 extracted from the well will be higher than the dies 5. The equipment 14 extracted from the well is captured by the dies 5 (see FIG. 1) and can be removed to the surface.

The proposed downhole fishing device has a simple structure, cheap to manufacture, while its efficiency does not decrease, and the hoisting and grabbing and capturing operations of the downhole equipment are carried out by means of a rope, which speeds up the process and reduces the cost of repair work.

Claims (1)

Downhole fishing device comprising a hollow body with a sample on the inner surface, drawn inward and located in a sample of the body of the die with inclined sections, characterized in that the selection of the hollow body is made cylindrical, and the inclined sections of the dies are made on the inner surface, while the dies are pressed inward covering their elastic element.