RU30824U1 - Device for repairing production wells - Google Patents

Description

DEVICE FOR REPAIR OF OPERATIONAL WELLS

The device relates to the oil and gas industry, and in particular to devices for the repair of production wells.

A device is known for repairing production wells in the event of a pipe break in them. The known device contains a hollow cylindrical body mounted on its surface with the possibility of axial movement along it of the die, on the outside provided with teeth, which are rectangular triangles A. in section. USSR No. 1375793.

The disadvantage of this device is the complexity of the institution inside the broken pipe due to the lack of a centering element in the device and the insufficient reliability of the capture and retention of the caught pipes by the raincoats when they are removed from the well.

A device is known for repairing production wells in the event of a pipe break in them. The known device comprises a hollow cylindrical body mounted on its surface with the possibility of axial movement of the die along it, on the outside provided with teeth, which are rectangular Iat triangles in cross section. RF number 2146755.

The disadvantage of this device is the insufficient reliability of the capture and retention of the caught pipes by the dies when they are removed from the well.

2003107225

 pshshmiiyapsh

(V-5l./ J7-2Z./5

MGG7 E 21 V 29/00

The challenge in creating the device is to develop a reliable and trouble-free mechanism, especially in the conditions of mobility overhaul of wells.

Achievable technical result consists in the reliability of the capture and retention of the caught pipes when removing them from the well with the uncomplicated design of the device, ease of installation and operation.

The task and the technical result are achieved by the fact that in the known device for the repair of production wells, including a hollow cylindrical body, mounted on its surface with the possibility of axial movement along it dies, provided with teeth on the outside, which are rectangular triangles in section, unlike of the prototype, the teeth of the dies in the middle part are equipped with recesses of a triangular shape, and the angle of the tooth section formed by the leg, placed on the surface of the cloak, and It is 30 degrees.

In FIG. 1 shows the inventive device, FIG. 2 - die, in FIG. 3, view A in FIG. 2.

The device consists of a housing 1, a holder plate 2, dies 3, a centralizer 4, and a tip 5.

The housing 1 is a cylindrical body with a central or central radial hole. In the lower part of the housing 1 on the side surfaces there are three inclined planes with longitudinal protrusions, on which the dies 3 are mounted together with the die holder 2 and centralizers 4. In the upper part of the housing 1 there is a thread for connecting the device to the drill pipe string. To the bottom of the housing 1 is attached a tip 5, which acts as a guide when entering the device into the catch pipe. From self-unscrewing, tip 5 is fixed with screw 6.

The die 3 has teeth on the outside for gripping the caught pipes, and on the inside there are bevelled surfaces and grooves with a section profile corresponding to the protrusions of the inclined planes of the housing 1, so that the die can move along the housing 1 without lateral displacement.

The teeth 7 of the dies 3 in the middle part are equipped with recesses 8 of a triangular shape, which prevents the possible sliding of the teeth 7 and, ultimately, the separation and disruption of the dies from the inner surface of the catch pipes, the repeated break and fall of the catch pipes into the well due to the clogging of the interdental openings of the dies with hard particles, for example, reservoir sand or metal chips.

In this case, the teeth 7 of the dies 3 are made with a cross-section, the angle of which, formed by the leg, placed on the surface of the dies, and the hypotenuse is 30 degrees, which ensures optimal capture and retention of the caught pipes by the dies when removing the pipes from the well.

The device operates as follows.

On the drill pipe string, the device is lowered without rotation into the well, carefully inserted into the catch pipe, and the descent is continued to the required depth. The centralizer 4 slides along the wall of the production casing of the deviated well and centers the device relative to the axis of the well, and the tip 5 serving as a guide prevents the device from abutting against the end of the catch pipe. When the device enters the catch pipe, the centralizer 4 centers the device relative to the axis of the catch pipe. By turning to the right, the dies 3 together with the dies holder 2 are released from the upper locking position created by engagement

stupas on the rear side of the die 3 with protrusions on inclined planes 6 on the housing 1. Under the influence of its own weight, the die 3 along the inclined planes of the housing 1 descend. As a result, they protrude beyond the dimensions of the housing 1 and jam between the housing 1 and the inner wall of the catch pipes. Subsequent pulling of the drill pipe string leads to further insertion of the teeth of 7 dies 3 into the body of the catch pipe and its reliable grip. To increase the reliability of the engagement of the teeth of 7 dies 3 with the inner surface of the caught pipes, the teeth of the dies in the middle part are equipped with recesses 8 of a triangular shape, which allows them to accumulate sand and other mechanical impurities located on the inner surface of the catch pipe and not impede the engagement of the teeth. Captured catch pipes are removed to the surface. To eliminate the possible separation of the caught pipes from the dies 3 of the device when removing them from the well, the tooth section 7 of the dies 3 is made with an angle of 30 degrees, preventing their separation.

The proposed device provides reliable capture and extraction of catchable pipes from the well, has a simple design, convenient for installation and maintenance. It can catch pipes both for the inner surface of the upper end, and for 5 astok located below, or for the inner surface of the next undamaged pipe. The proposed device can significantly improve the reliability of operation and repair of wells by reducing downtime in the event of an accident.

Claims (1)

A device for repairing production wells, including a hollow cylindrical body mounted on its surface with the possibility of axial movement along it of the die, on the outside provided with teeth, which are rectangular triangles in cross section, characterized in that the teeth of the dies in the middle part are provided with recesses of a triangular shape, and the angle of the tooth section formed by the leg, placed on the surface of the plate, and the hypotenuse is 30 °.