RU52911U1 - PACKER FOR OVERLAPING THE INTERNAL CAVITY OF A PIPE COLUMN - Google Patents

Abstract

The proposal relates to the field of oil production, namely to the repair and operation of oil and gas wells. The packer for overlapping the inner cavity of the pipe string includes a body with a central through channel, upper and lower stops rigidly connected to the body. Between the stops, a sealing element is fixed having a thickened and thin-walled bell-shaped parts, the last of which forms a cavity with the outer wall of the housing. The upper stop is made with holes communicating the cavity with the external space of the device. At the same time, on the outer surface of the sealing element, a self-sealing cuff is made that allows fluid to pass from bottom to top. The proposed design of the packer allows you to reliably work with high pressures due to better insulation of the annulus.

Description

The proposal relates to the oil industry and can be used in the repair and operation of oil and gas wells.

Known packer for overlapping the inner cavity of the pipe string, comprising a housing with a Central channel, upper and lower stops and a sealing element having a thickened and thin-walled bell-shaped parts, the latter of which forms a cavity with the outer wall of the housing (AS USSR, No. 829868, Cl E 21 33/12, publ. Bull. No. 18 of 05.15.81)

The disadvantages of the known packer include the complexity of the design, in particular the presence of moving parts, which in downhole conditions generally do not work due to deposits in these nodes of sludge, sand and other mechanical particles, which reduces their performance, as well as the limited technological capabilities thereof, as it does not allow to carry out operations with the formation below the packer in the presence of a high-pressure overlying formation and hermetically disconnect the formation from the higher and lower layers for selective th research, testing and treatment of the selected reservoir.

Closest to the proposed packer is "Packer for overlapping the inner cavity of the pipe string" (RF patent No. 2143542 IPC E 21 B 33/12, publ. Bull. No. 36 dated 12/27/99), including a housing with a central through channel, upper and lower stops and sealing element. The sealing element has a thickened and thin-walled bell-shaped parts, the last of which forms a cavity with the outer wall of the housing, the upper and lower stops are rigidly connected to the corresponding parts of the sealing element and with the housing, while the upper stop is made with holes communicating the cavity with the external space of the device, the maximum outer diameter of the thin-walled socket part when it expands is 1-3% more than the inner diameter of the pipe string.

This packer (prototype) also has a number of significant drawbacks - a small pressure limit, ensuring the tightness of the separated intervals and the need to apply force at the very beginning of the descent into the well. Due to the fact that the outer surface of the sealing element is smooth when exposed to a pressure of more than 3-4 MPa (bench test data), hydraulic breakage occurs and

depressurization of the separation intervals at the place of contact of the sealing element with the casing wall.

The technical problem is gender. The model is an increase in reliability due to better insulation of the annulus and, as a result, the possibility of working with high pressures.

The technical problem is solved by the packer to overlap the inner cavity of the pipe string, comprising a housing with a central channel, an upper and lower stop, between which a sealing element is fixed having a thickened and thin-walled bell-shaped parts, the last of which forms a cavity with the outer wall of the housing, the upper stop being made with holes communicating the cavity with the external space of the device.

New is the fact that on the outer surface of the sealing element is made self-sealing cuff that allows fluid to pass from the bottom up.

Figure 1 shows a diagram of a packer in longitudinal section.

Figure 2 shows a section aa packer.

The packer for closing the inner cavity of the pipe string includes a housing 1 (FIG. 1) with a central through channel 2, upper 3 and lower 4 stops. Between the stops 3 and 4, a sealing element 5 is fixed, having a thickened 6 and thin-walled 7 socket parts, the latter of which forms a cavity 8 with the outer wall of the housing 1. The upper stop 3 is made with holes 9 (FIG. 2) communicating the cavity 8 (FIG. 1) with the external space of the device. At the same time, on the outer surface of the sealing element 5, a self-sealing cuff 10 is made, passing liquid from the bottom up.

The packer works as follows.

The housing (Fig. 1) of the packer is installed as part of the layout of the downhole equipment (not shown in Fig.), Which is lowered into the pipe string of the well (in Fig. Not shown in the tubing string (Fig. Not shown)) ) to the desired section, the upper 3 (Figure 1) and lower 4 stops center the packer in the pipe string, and its thickened bell-shaped part 6 of the sealing element 5 holds it in its original position. Then create a pressure drop from above in the annulus of the tubing, which, transmitted through the holes 9 (Figure 2) of the upper stop 3 (Figure 1) into the cavity 8, presses the thin-walled bell-shaped part 7 and the self-sealing sleeve 10 of the sealing element 5 to the inner surface of the pipe string reliably isolating the lower interval of the well, since

self-sealing cuff 10 eliminates the possibility of hydraulic break from above at pressures above 3-4 MPa.

The proposed design of the packer allows you to reliably work with high pressures due to better insulation of the annulus.

Claims (1)

A packer for closing the inner cavity of the pipe string, comprising a housing with a central channel, an upper and a lower stop, between which a sealing element is fixed having a thickened and thin-walled bell-shaped parts, the latter of which forms a cavity with the outer wall of the housing, the upper stop being made with holes communicating cavity with the external space of the device, characterized in that on the outer surface of the sealing element is made self-sealing cuff, passing from the bottom up.