SU1654552A1 - Device for setting coverage element in the borehole - Google Patents

Abstract

The invention relates to a drilling technique for overlapping annular gaps, in particular, can be used in the suspension of casing liners. The purpose of the invention is to increase the reliability of the device when using it for hanging casing liners. The device includes a housing (K) 1 with radial holes 2-5. blocked check valves and metal bark 6. At the entrance to the atmospheric pressure chamber 14, a valve 12 is installed in the form of a sleeve with a lock. Two packers 10 are installed above and below the core 6 on K 1. The cavity between K 1 and bar 6 is hydraulically connected to the in-pipe space by holes 17 and 18 in the disconnector, bore 19 and groove 20 of the barrel 9 The ring cavity between the packers 10 is connected by holes 4 and 16 with a chamber 14. As a result, the pressure in the cavity decreases and the metal deformable bark 6 under the action of internal overpressure in the drill string and the reduced pressure in the cavity further expands to tight contact with the casing 26th and the introduction of the slips in it 7. 4 or

Description

The invention relates to drilling equipment for overlapping annular gaps and can be used for suspension of casing shanks.

The purpose of the invention is to increase the reliability of the device when used to suspend the casing shanks.

Figure 1 shows the device in the transport position; figure 2 is the same, at the time of increasing pressure in the in-tube space and the operation of the packers; in Fig.3 - the same, after the actuation of the switching valve and the message cavity between the packers with the atmospheric pressure chamber; figure 4 - after disconnecting the liner with a string of drill pipes and their rise from the well.

A device for installing a blocking element in a well includes a cylindrical step housing 1 with radial holes 2-5, with holes 2, 3, and 5 being blocked by check valves, a metal deformable anchor 6 with slips 7 placed on the outer surface of the housing 1 and covering the radial hole 2 s a check valve, a disconnector, consisting of a pipe 8 and a barrel 9. Above and below the armature 6 on the housing 1 there are two packers 10. driven.

The device has a valve 12, made in the form of a sleeve, fixed on the disconnector with a shear pin 13 and located at the inlet of the atmospheric pressure chamber 14, isolated from above the annulus by a plug 15. The cavities between the packers 10 (halfway A, Fig. 3) are connected to the chamber 14 atmospheric pressure through valve 12.

The cavity between the housing and the armature is hydraulically connected to the in-tube space through the holes 17 and 18 in the disconnector, the bores 19 and the grooves 20 of the barrel 9. The fluid is supplied to the packers 10 through the holes 17,18 and 21. The disconnector is connected to the housing 1 by the left-hand thread 22. Sealing the device is provided with o-rings 22 and 23. To stop the plug in the device, screws 24 are installed in the pipe 8, which can be replaced by a reduced inner diameter of the lower section of the pipe 8.

The device operates as follows. At the end of the cementing of the countersunk casing into the device, screw 24 sits on the plug 25 and increases the pressure above it. When this occurs, the packing of the annular space packers 10 and the preliminary deformation of the metal anchor 6 (figure 2). With an increase in internal overpressure, the pin 13 is cut and the valves 12 move to the lowest position. The annular cavity A between the packers 10 communicates with openings 4 and 16 with a chamber 14 of atmospheric pressure. As a result, the pressure in cavity A drops and the metal deformable anchor 6 under the influence of internal overpressure in the drill string and reduced pressure in cavity A further expands to close contact with the casing 26 and the introduction of slips into it

7. The fluid displaced from the annular cavity between the packers 10 then enters the chamber 14. As a result of the reduction in pressure in the annular cavity, the packers 10 are also additionally packaged (Fig. 3). After that, the pressure in the string is reduced to zero, and by turning the drill string to the right, turn off the left thread 22 and raise the disconnector to the surface. In the well remains a countersunk string suspended and sealed by the proposed device (figure 4).

Thus, the decrease in pressure in the cavity between the packers contributes to the growth of deformations and the holding ability of the metal armature from the action of in-pipe pressure, which, ultimately, increases the reliability of the device.

Claims (1)

Claim A device for installing a blocking element in a well, including a housing, an atmospheric pressure chamber mounted on the housing and forming a metal core with a cavity and a valve with a retainer installed at the inlet of the atmospheric pressure chamber, which is meant to increase reliability work when it is used for suspension of casing shanks, it is equipped with two packers installed on the body, each of which is located above and below the anchor, and the cavity between the body and the anchor hydraulically connected to the in-tube space, and the housing between the packers and the armature has channels connected to the atmospheric pressure chamber through the valve. Fig. C