RU2544211C1 - Device for deposits isolation in well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device includes hollow casing with at least one top radial hole, at least one bottom radial hole, at least one outside longitudinal groove. The top radial hole is closed by the shear pin. The bottom radial hole is closed by ring spring-loaded sleeve with internal ring groove. From outside the casing there is enclosure creating with the casing the ring chamber. The device contains position switch with profiled groove, in which part of the hollow shear shift is inserted outside the casing. In the device bottom below the profiled groove of the casing the parker is installed. The ring sleeve ands position switch of the device are linked with each other using movable joint and are installed in the ring chamber with possibility of movement upon hydraulic connection of the casing cavity and profiled groove as per the switch code. One of these codes contains such device position when the casing cavity is hydraulically connected with the parker cavity via the bottom casing holes, internal ring groove of the ring sleeve and outside longitudinal casing groove.

EFFECT: increased reliability of device operation and extension of the scope of application.

2 dwg

Description

The invention relates to the oil and gas industry and can be used to isolate the layers in the well when it is attached.

A device for isolating layers in a well is known, including a hollow body with a radial hole covered by a hollow shear pin, a hydraulic packer, a sleeve mounted on the body and forming an annular cavity with it, a working sleeve placed in an annular cavity, a device position switch with a figured groove and a finger, one end of which is connected to the body, and the other end is placed in a figured groove (RU 2182957, 05.27.2002).

A disadvantage of the known device is its low reliability, due to the need to fill the cavity of the sealing assembly through the hole of the hollow shear pin with low throughput. In addition, a violation of the tightness of the device, which is likely in the area of the finger, during cementing can lead to premature operation of the sealing unit and as a result to an emergency.

The technical result of the invention is to increase the reliability of the device and expand the scope of its application.

The required technical result is achieved in that the device for isolating the formations in the well includes a hollow body with an upper radial hole, at least one, blocked by a hollow shear pin, a lower radial hole, at least one, closed by an annular spring-loaded sleeve with an inner annular groove, an outer a longitudinal groove, at least one, a casing placed on the outside of the housing and forming an annular chamber with it, a position switch of the device with a profiled groove in which is placed part of the hollow shear pin outside the housing, a packer located in the lower part of the device below the profiled groove of the housing, while the annular sleeve and the position switch of the device are interconnected by a movable connection and placed in the annular chamber with the possibility of movement, with hydraulic communication of the cavity of the housing with the annular chamber, according to the switch code, one of which ensures the position of the device in which the housing cavity is hydraulically connected to the packer cavity through the lower holes of the housing , the inner annular groove of the annular sleeve and the outer longitudinal groove of the housing.

Figure 1 shows the device in the initial transport position, figure 2 is a diagram of the various positions of the device.

The device (see figure 1) includes a hollow body 1 with an upper radial hole 2, at least one, blocked by a hollow shear pin 3, a lower radial hole 4, at least one, blocked by an annular spring-loaded sleeve 5 with an inner annular groove 6, an external longitudinal groove 7, at least one, a casing 8, placed outside the housing 1 and forming an annular chamber 9 with it, a position switch of the device 10 with a profiled groove 11, in which a part of the hollow shear pin 3 is placed outside the housing 1. In the lower part stroystva below the profiled slot 7 of the casing 1 placed packer 12 (shown in phantom). The annular sleeve 5 and the position switch of the device 10 are interconnected by a movable connection and placed in the annular chamber 9 with the possibility of moving along the code of the switch 10 when the cavity of the housing 1 is hydraulically connected to the annular chamber 9. One of the codes of the switch 10 provides such a position that the cavity the housing 1 is hydraulically connected with the cavity of the packer 12 through the lower holes 4 of the housing 1, the inner annular groove 6 of the annular sleeve 5 and the outer longitudinal groove 7 of the housing 1.

In addition, the annular sleeve 5 has radial holes 13, and the position switch of the device 10 has an annular groove 14. Balls 15 are placed in the radial holes 13 and the annular groove 14, providing a movable connection of the annular sleeve 5 and the position switch of the device 10.

The annular sleeve 5 is spring-loaded with a spring 16, for example, relative to the packer 12. This sleeve can be spring-loaded relative to the housing 1 or the casing 8.

To ensure the tightness of the device, sealing elements are provided, for example, rings 17.

Positions P1-P6 (figure 2) indicate the various positions of the switch, namely:

P1 - transport position;

P2 - position after passing through the separation plug device;

P3 - position after depressurization in the casing;

P4 - position at the time of activation of the packer;

P5 - position after depressurization in the casing;

P6 - safety position for unexpected pressure increase, for example, during repair work in the well.

The device operates as follows. After the casing with the device according to the invention is lowered into the well and the calculated volume of grouting fluid is pumped into the casing, a separation plug is inserted into this casing (not shown in FIG.), Which cuts the hollow pin 3 and moves down the casing until it is “stop” -ring. After cutting the hollow pin 3, the liquid from the cavity of the column, under the action of excess pressure entering the annular chamber 9, partially moves the switch 10 and the annular sleeve 5, while compressing the spring 16. The part of the hollow pin 3 located in the profiled groove 11 of the switch 10 rotates the last in position 2 - P2 (see figure 2), in which he remains until the end of the cementing process of the well. At the same time, the packer valve system remains closed, as the annular sleeve 5 partially moves along the housing, and the depressurization of the sealing ring does not occur. After the completion of the cementing process, the pressure in the casing is removed, and the annular sleeve 5, under the action of the compressed spring 16, partially turning the switch 10, sets it to position 3 - PZ. With a repeated increase in pressure in the casing, the switch 10 and the annular sleeve 5, compressing the spring 16, move, the switch at that takes position 4 - P4, i.e. there is an increased stroke of the annular sleeve 5, and the liquid through the lower radial holes 4, the annular groove 6, combined with the longitudinal groove 7, at least one, enters the cavity of the sealing element of the packer 12 with the required flow rate.

After depressurizing the column, the annular sleeve 5, under the action of the spring 16, partially turning the switch 10, sets it to position 5 - P5. With further increases in pressure in the casing (for example, repair work in the well), the axial movement of the switch 10 to position 6 - P6 occurs. In this case, liquid access to the sealing element of the packer 12 is excluded.

Claims (1)

A device for isolating formations in a well, comprising a hollow body with an upper radial hole, at least one, blocked by a hollow shear pin, a lower radial hole, at least one, closed by an annular spring-loaded sleeve with an internal annular groove, an external longitudinal groove, at least one, a casing placed outside the casing and forming an annular chamber with it, a position switch of the device with a profiled groove in which a part of the hollow shear pin is placed outside the casing, a packer, placed in the lower part of the device below the profiled groove of the housing, while the annular sleeve and the position switch of the device are interconnected by a movable connection and placed in the annular chamber with the possibility of movement, with hydraulic communication of the cavity of the housing with the annular chamber, according to the switch codes, one of which contains such the position of the device, in which the cavity of the housing is hydraulically connected with the cavity of the packer through the lower holes of the housing, the inner annular groove of the annular sleeve and out nd longitudinal groove of the body.

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