RU91595U1 - DEVICE FOR CLEANING THE INTERIOR SURFACE OF THE OPERATIONAL COLUMN - Google Patents

Abstract

A device for cleaning the inner surface of the production casing, comprising a housing with windows for retractable cutting dies, an elastic cylinder with a mounting unit in the sleeve, characterized in that the device is equipped with a pressure valve and a flushing valve comprising a housing with a radial-axial flushing channel and pressure axial channels and also a non-return valve in the form of a saddle with a ball, while the flushing valve hydraulically connects the tube space when cleaning the inner surface of the production string GUT pipe string with an elastic balloon, and when lifting the locking body press-fitting the valve to the surface fluidly connects the tube space of the pipe string with the well annulus.

Description

The utility model relates to the oil and gas industry and is intended for high-quality cleaning of sections of the inner surface of the casing strings of oil and gas wells at the place of installation of steel adhesives, packers and other borehole devices, providing a tight fit to the wall of the string, as well as for crimping the tubing string.

A device for cleaning the inner surface of the casing strings, comprising a housing with grooves for retractable cutting dies, an elastic balloon, fixed in the sleeve with cones using pressure nuts, provided with leaf springs, rigidly connected with the dies and interacting with an elastic cylinder. The rectilinear sections of the ends of the spring are placed in grooves on the outer surface of the sleeve and abut against the body (AS No. 1596078 class IPC Е21В 37/02).

The disadvantages of this device are:

- insufficient durability;

- design complexity;

- the complexity of manufacturing and maintenance;

- the lack of pressure testing the tubing string.

Closest to the proposed utility model is a device for cleaning the inner surface of the casing strings, comprising a housing with windows for retractable cutting dies, an elastic balloon with its attachment point in the sleeve, leaf springs interacting with an elastic balloon. The ends of the spring are made arcuate without straight sections at the ends and are placed in grooves on the outer surface of the sleeve and are connected to retractable cutting dies through holders mounted on the dies. In addition, the attachment point of the elastic cylinder in the sleeve contains a rod installed inside the body along its entire length - a coupler with a thread at the ends, on which two cones are mounted that clamp the ends of the elastic cylinder in the conical bores of the sleeve, and two persistent bushings with nuts. The elastic cylinder is made of a rubber-fabric pressure head sleeve with a cord of chemical fiber (RF patent No. 74954 class IPC ЕВВ 37/02).

The disadvantage of this technical solution is that the device itself does not allow crimping of the tubing string.

The objective of the proposed utility model is the combination of operations to clean the walls of the production string in a given interval and crimping tubing, as well as reducing labor and economic costs when repairing wells.

The problem is solved in that the device for cleaning the inner surface of the production casing, comprising a housing with windows for retractable cutting dies, an elastic cylinder with a mounting unit in the sleeve, the device is equipped with a crimping valve and a flushing valve containing a housing with a radial-axial flushing channel and discharge axial channels, as well as a check valve in the form of a saddle with a ball, while the flush valve when cleaning the inner surface of the production string hydraulically connects the rubbing space of the pipe string with an elastic balloon, and when lifting the shut-off element of the crimping valve to the day surface, hydraulically connects the pipe space of the pipe string with the annular space of the well.

Distinctive features of the device are pressure testing valve, flushing valve with radial inlet of flushing fluid. New in the device is that the cleaning of the inner surface of the production string and the pressure testing of the tubing string is carried out in a single descent-lifting of the tubing string. Figure 1 shows a General view of the device. Figure 2 - flushing valve with a lateral inlet of flushing fluid. Figure 3 shows the node cleaning the inner surface of the production casing.

The device consists of a node for cleaning the inner surface of the production casing 1, flushing valve 2, pressure testing valve 3, couplings 4.

The flushing valve 2 comprises a housing 5 with connecting threads, a check valve housing 6, a non-return valve seat 7, a ball 8. In the housing 5, up to half the height of the housing, a central axial hole 9 is made, which is connected to the radial hole 10. For pumping fluid from the pipe space, the pump -compressor pipes into the cavity of the node cleaning the walls of the production casing in the housing 5 made four through axial holes 11.

The flushing valve body 5 is connected to the check valve body 6 by means of a threaded connection. The check valve housing contains four longitudinal windows 12.

The cleaning unit of the inner walls of the production casing consists of a housing 13 with a sub 14 for connecting to the tubing string (not shown) and a pipe 15 with a fitting 16. In the housing 13 there are windows 17 with retractable cutting dies installed therein 18. B a composite sleeve 19 is installed in the housing, with windows corresponding to the windows 17 in the housing 13 and grooves 20 on the outer surface, in which the ends of the leaf springs 21 are located, connected to the dies 18 through the holders 19, fixed to the dies 18 by screws 23. In the sleeve 19 an elastic balloon 24 is placed, which is a segment of a rubber-fabric pressure head sleeve with a cord of chemical fiber. At both ends, the cylinder 24 is clamped by the cones 25 in the conical bores of the sleeve 19 with the help of a rod - tie 26 having threads at its ends with nuts 27 and thrust bushings 28.

The flushing valve 2 when cleaning the inner surface of the production string hydraulically connects the pipe space of the pipe string with an elastic cylinder 24, and when lifting the shut-off element of the pressure valve to the day surface, hydraulically connects the pipe space of the pipe string with the annular space of the well.

The device operates as follows.

In the inoperative (transport) position, the dies 18 are drawn by leaf springs 21 into the windows 17 of the housing 13. On the tubing string, the assembled device as a part of the cleaning unit of the inner walls of the production string 1, flushing valve 2, pressure valve 3 is lowered into the well to the desired depth. A pressure line is connected to the tubing and fluid is supplied to the pipe string. When crimping the pipe string, ball 8 sits on the seat 7, blocking the axial channel 9. After crimping the process pipe string, the crimping element (not specified) is washed out of the crimping valve and tubing string onto the well surface. For this, flushing fluid is pumped into the annulus of the well. Flushing fluid under pressure through the radial channel 10 and the axial channel 9 enters the check valve. The ball 8 rises, and the flushing fluid through the longitudinal windows 12 of the check valve body 6 enters the crimping valve 3. The flushing fluid raises the shut-off element of the crimping valve to the surface. After lifting the shut-off element of the crimping valve, the tubing string is again connected to the discharge line and liquid is supplied to the pipe string. The fluid passes through the axial holes 11 and enters the housing of the cleaning unit 13. Under the action of excessive (35-40 atm.) Pressure in the housing 13, the elastic balloon 24, acting through the leaf springs 21, pushes the dies 16 and presses them against the wall of the production string with force proportional to overpressure. The device is lifted up the column in the processing interval, while the dies 16 clean the walls of the production string, then release pressure and lower the device to the original boundary of the processing interval. Repeat the operation of lifting the device under pressure. For high-quality cleaning of the casing walls, it is enough to repeat the work cycle 4-6 times.

The use of the utility model allows for better cleaning of the walls of the production string, as well as combining the cleaning of the walls of the production string and crimping the tubing string, followed by washing and removing the crimping element (ball, cone, etc.).

The use of a utility model reduces the labor and economic costs necessary for well repair, and the repair will be carried out more qualitatively than the repair, in which any other equipment would be used to clean the walls of the production casing. In turn, this will reduce the overhaul period of the well and improve the quality of production wells.

Claims (1)

A device for cleaning the inner surface of the production casing, comprising a housing with windows for retractable cutting dies, an elastic cylinder with a mounting unit in the sleeve, characterized in that the device is equipped with a crimping valve and a flushing valve comprising a housing with a radial-axial flushing channel and pressure axial channels as well as a non-return valve in the form of a saddle with a ball, while the flushing valve hydraulically connects the tube space when cleaning the inner surface of the production string GUT pipe string with an elastic balloon, and when lifting the locking body press-fitting the valve to the surface fluidly connects the tube space of the pipe string with the well annulus.