RU164341U1 - DEVICE FOR CARRYING WORKS IN A WELL - Google Patents

Abstract

1. A device for conducting fishing operations in a well, comprising serially applied means of applying axial force, a non-self-locking screw mechanism and a fishing tool, a non-self-locking screw mechanism comprising a driving link - a hollow cylindrical shaft connected to the axial force applying means, and a driven link - a hollow cylindrical body mounted rotatably around its axis, while a fishing tool is fixed in the lower part of the hollow cylindrical body. 2. A device for carrying out fishing operations in a well according to claim 1, characterized in that said means of applying axial force is a tubing string. A device for conducting fishing operations in a well according to claim 1, characterized in that said means of applying axial force is a drill pipe string. A device for fishing in a well according to claim 1, characterized in that said means of applying axial force is a flexible pipe.

Description

The utility model relates to the oil and gas industry, namely, devices for fishing operations in the well.

In domestic practice, when catching emergency pipes, various mechanical or hydraulic rotors are used to rotate the string of pipes lowered into the emergency well, for example, drill pipes, tubing, steel drill pipes, with a fishing tool such as pipes, overshots, bells , taps, etc. [Amirov A.D. and other Reference book on the current and capital repair of oil and gas wells - M .: Nedra, 1979. - 309 p.].

To date, most wells have entered the late stage of development, which is characterized by low wellhead parameters and inflow of produced water to the bottom of the well. The use of traditional fishing methods using rotors or downhole motors to rotate the pipe string involves killing the well, which at this stage of development may lead to the well being decommissioned. To carry out repairs without killing the well, a coiled tubing installation can be used, with the main problem being the inability to rotate the flexible pipe.

A fishing device is known for extracting a stuck string of flexible pipes using a flexible pipe, comprising a check valve, a downhole motor, a catcher, a sub, a hydraulic anchor, a deep hydraulic jack [RU 155017 U1, E21B 31/20 (2006.01), publ. 09/20/2015].

A disadvantage of the known device is the difficulty of lowering the layout of the device on a flexible pipe due to the difference in the diameters of its elements and possible difficulty when passing through the sealant, as well as the engagement of the elements at the junction of the tubing string.

Known head unit made with the possibility of lowering into the drill string and removing it, which contains a fishing head unit with a fishing tip and a locking device connected to each other and to the pipe [US 2012/0074722 A1, IPC E21B 31/20 (2006.01), publ. 2012]. The locking device provides the ability to move the head unit in the drill string to prevent movement in the axial direction (rotation).

A disadvantage of the known device is the lack of a column rotation mechanism, as a result of which a rotor is used for these purposes. In this regard, there is no possibility of fishing without killing the well.

The technical problem lies in the need to create a device of a new design within the framework of import substitution, which will ensure fishing operations in the well, with the possibility of converting the axial load of the pipe into rotational movement of the fishing tool, including in hard-to-reach areas.

The technical result of creating a utility model is to provide the possibility of creating a device designed for fishing operations in the well, including in hard-to-reach areas, provided that the axial load of the pipe is converted into rotational movement of the fishing tool.

The technical result is achieved by the fact that the device for conducting fishing operations in the well contains serially connected means of applying axial force, a screw non-self-locking mechanism and a fishing tool, a screw non-self-locking mechanism contains a driving link - a hollow cylindrical shaft connected to the means of applying axial force and a driven link - hollow a cylindrical body mounted rotatably about its axis, while in the lower part of the hollow cylindrical body is fixed fishing tool.

There is an option in which said axial force application means is a tubing string.

There is also a variant in which said means of applying axial force is a drill pipe string.

A variant is possible in which said means of applying axial force is a flexible pipe.

In FIG. 1 schematically shows a device for conducting fishing operations in a well, which shows the location of the hollow cylindrical shaft in its highest position.

In FIG. 2 schematically shows a device for conducting fishing operations in a well, which shows the location of the hollow cylindrical shaft in its lowest position.

A device for carrying out fishing operations in the well (Fig. 1 and Fig. 2) contains serially connected means of applying axial force 1, a non-self-locking screw mechanism 2 and a fishing tool 3, for example, a tube, which includes dies.

Non-self-braking screw mechanism 2 contains (Fig. 1) a driving link - a hollow cylindrical shaft 4 connected to means of applying axial force 1, for example, a tubing string, or a drill pipe string, or a flexible pipe, through a sleeve 5 and a driven link - a hollow cylindrical body 6 mounted rotatably around its axis. The hollow cylindrical shaft 4 and the hollow cylindrical body 6 are a helical pair.

At the same time, on the outer surface of the hollow cylindrical shaft 4, stroke limiters 7 and 8 are made, which are designed to limit the stroke of the hollow cylindrical shaft 4 from axial movement up or down. In the middle part of the outer surface of the hollow cylindrical shaft 4, turns 9 are made. The inner cavity 10 of the hollow cylindrical shaft 4 serves to ensure circulation of the flushing fluid.

O-rings 11 and 12 are placed in the upper and lower parts of the hollow cylindrical body 6. The turns 13 are made in the middle part of the inner surface of the hollow cylindrical body 6. The inner cavity 14 of the hollow cylindrical body 6 is filled with grease, for example, solid oil.

In the lower part of the hollow cylindrical body 6, a fishing tool 3 is fixed by means of a sub 15.

As a non-self-locking screw mechanism 2, helical gears with low sliding friction or rolling helical gears can be used.

The device operates as follows.

A device is lowered into the emergency well, up to the head of the extracted object, for example, drill or tubing, for example, using a mobile lifting unit using a tubing string as a means of applying axial force 1.

When the device rests on a retrievable object, for example, in a tubing pipe, the translational movement of the axial force application means 1 is converted into the rotational movement of the fishing tool 3.

Namely, under the action of the axial force F, the leading link is locked - the hollow cylindrical shaft 4 and its translational movement down. The driven link - the hollow cylindrical body 6 begins to rotate, causing the fishing tool 3 to rotate as which, for example, a tube is used.

When the tube is turned and subsequently lifted, the dies are pushed apart, which, with their comb teeth, cut into the inner surface of the caught pipes.

After completion of the planned work, a device with a captured pipe is removed from the well.

It is possible that the device can be lowered using a drilling rig using a drill pipe string as a means of applying axial force 1.

When carrying out technological operations using a drilling rig, it allows you to rotate the fishing tool without using a mechanical or hydraulic rotor. The rotors are used to rotate the pipe string in downhole conditions. This requires a large torque, since it is necessary to overcome the resistance at the contact points of the pipe string and the casing. In some cases, the rotor may not withstand and fail. In addition, the rotors have large overall dimensions and weight, which complicates its delivery to the well, especially in hard-to-reach areas. It also saves time spent on installation work.

It is also possible that the device can be launched using a coiled tubing unit using a flexible pipe as a means of applying axial force 1.

When carrying out technological operations using a coiled tubing unit, it allows fishing operations without killing the well, which favorably affects the state of the bottomhole formation zone of the well being repaired, reduces material and time costs for repairs.

Thus, the claimed device provides fishing operations in the well by converting the axial load of the pipe into the rotational movement of the fishing tool, which allows to expand the arsenal of technical tools used for fishing in the well, especially in hard-to-reach areas.

Claims (4)

1. A device for carrying out fishing operations in the well, comprising serially connected means of applying axial force, a non-self-locking screw mechanism and a fishing tool, a non-self-locking screw mechanism comprising a driving link - a hollow cylindrical shaft connected to the axial force applying means, and a driven link - a hollow cylindrical body mounted rotatably around its axis, while a fishing tool is fixed in the lower part of the hollow cylindrical body. 2. A device for conducting fishing operations in a well according to claim 1, characterized in that said means of applying axial force is a tubing string. 3. A device for conducting fishing operations in a well according to claim 1, characterized in that said means of applying axial force is a drill pipe string. 4. A device for conducting fishing operations in a well according to claim 1, characterized in that said means of applying axial force is a flexible pipe.

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