RU2527098C1 - Device for actuation of well casing attachment unit - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device includes a case with a radial opening, a hollow shear pin, an elastic collar and a pusher. The shear pin covers the radial opening inside the case and protrudes toward the case inner part. The elastic collar covers the radial opening outside the case and is fixed in it. The pusher with the elastic collar forms a circular cavity against its radial opening. The pusher is fixed in run-in position in regard to the case. The pusher is designed to move axially in its working position in order to interact with the casing attachment unit when the case cavity interacts with the circular cavity through the cavity of the broken shear pin and to fix the casing attachment unit in its working position.

EFFECT: higher operational reliability of the device, ensuring its universality, expanded scope of application.

8 cl, 2 dwg

Description

The invention relates to the construction and operation of oil and gas wells.

A device is known for actuating a snap-in unit of a casing string of a well, including a hollow body and a casing with radial holes, forming an annular chamber, an annular shutter, sealing cuffs, a hydraulic pusher located in the annular chamber, a system of ring bushings overlapping the radial openings of the casing (see ., for example, RU 2386012, 04/10/2010).

The disadvantage of this device is the need, to protect the sealing cuffs from premature operation, to place a sleeve with a saddle in the passage channel, which narrows the passage channel of the device and requires subsequent drilling.

There is also known a device for actuating a tooling unit for a casing string of a well, including a liner with a funnel, a transport column with an adjusting saddle, elastic sealing cuffs installed on the outer surface of the liner, a hydraulic pusher with dies, forming an annular chamber with the liner hydraulically connected with the liner cavity in his working position (see, for example, RU No. 2346143, 02/10/2009).

The disadvantage of this device are:

- the inability to place the element of protection against premature operation - shear hollow pin in the wall of the housing having a small (up to 6 mm) thickness;

- the lack of a node for fixing the hydraulic pusher in its final (working) position.

These disadvantages greatly limit the scope of the device.

The technical result of the invention is to increase the reliability of the device and ensure its versatility - the expansion of the scope.

The required technical result is achieved in that the device for actuating the casing rig assembly includes a housing with a radial hole, at least one, a hollow shear pin overlapping the radial hole inside the housing and protruding into the housing, an elastic cuff overlapping the radial hole outside the housing and fixed on it, the pusher forming with the housing, against its radial hole with an elastic cuff, an annular cavity, while the pusher is fixed in t ansportnom position of the device relative to the housing, is axially movable in the working position of the device to interact with the display unit casing in communicating with the cavity housing the annular cavity through the cavity and destroyed by shear pin lock the assembly tooling of the casing in its working position.

Besides:

a packer was adopted as a casing rig assembly;

An anchor has been adopted as a snap-in unit for the casing of the well;

as a snap-in unit for the casing of the well, a sleeve has been adopted for blocking or opening the hole for cementing;

the radial hole of the housing is made stepped, having a diameter on the outside of the housing that is larger than the diameter inside the housing, a sealing ring is placed in the radial hole on its step, and the hollow shear pin is made with a mating step in the housing wall and has a threaded sleeve on the outer surface that extends into the housing a connection installed with an interference fit before interacting with the inner wall of the housing and ensuring the necessary deformation of the sealing ring;

the sleeve is made with an outer spherical surface or in the form of a split segment;

the hollow shear pin on the outside of the housing has a means that prevents the entry of destroyed elements when the device is triggered into the annular cavity;

the hollow shear pin is engraved or rolled on the outside of the housing.

The implementation of the device with the signs according to claims 2-4 illustrates, by way of example, the extension of the scope. The implementation of the device according to PP.5-8 contributes to an even greater degree to increase the reliability of the device by increasing the tightness of its elements using elements or nodes to achieve this tightness.

Figure 1 shows a General view of the device, and figure 2 shows its node.

The device includes a housing 1 with a radial hole 2, at least one shear pin 3 with a cavity 4 (blind channel), overlapping the radial hole 2 inside the housing 1 and protruding into the housing, an elastic cuff 5, overlapping the radial hole 2 outside the housing 1 and fixed On him. The elastic cuff 5 can be fixed on the housing 1, for example, using a ring 6. On the outside of the housing there is a pusher 7, forming with the housing 1, against its radial hole 2 with an elastic cuff 5, the annular cavity 8. In this case, the pusher 7 is fixed in the transport position devices relative to the housing 1, for example, using a sleeve 9 with a shear screw 10 placed in the annular cavity 8 below the ring 6 with an elastic sleeve 5. The pusher 7 has the possibility of axial movement in the working position of the device for interaction with th display casing 11, which belongs to the housing 1. Node production casing 11 may be formed, for example, a packer as schematically shown in Figure 1. The snap-in assembly can also be made in the form, for example, of an anchor for a packer, or a casing, or a sleeve for blocking or opening a hole for cementing. The pusher 7 has the possibility of axial movement when communicating the cavity 12 (passage channel) of the housing 1 with the annular cavity 8 through the cavity 4 of the destroyed shear pin 3 and fixing the snap assembly 11 of the casing in its working position.

The radial hole 2 of the housing 1 can be made, for example, stepped, having a diameter on the outside of the housing that exceeds the diameter inside the housing. A sealing ring 14 is placed in the radial hole 2 at its step 13 (ring collar), and the hollow shear pin 3 is made with a mating step in the wall of the housing 1 and has a sleeve 15 on the threaded connection 16 and with a threaded connection on the outer surface that extends into the housing 1 hole 17, installed with an interference fit before interacting with the inner wall of the housing 1 and ensure the necessary deformation of the sealing ring 14.

The sleeve 15 can be made with an outer ball surface to provide better interference and guaranteed shear pin shear according to the necessary scheme.

The hollow shear pin 3 on the outer side of the housing 1 has a means of preventing the entry of destroyed elements when the device is triggered into the annular cavity 8. As an example, the hollow shear pin on the outer side of the housing can be engraved or rolled (flared).

The necessary tightness of the device is provided by the sealing elements 18.

The device operates as follows.

After the device is lowered into the specified interval of the well and the necessary technological operations (for example, cementing, installation of an oil bath, etc.) are carried out, a separation plug (conditionally not shown in FIG. 1) is inserted into the casing with the housing 1, which, passing through the device and interacting with a sleeve 15, made, for example, with a spherical surface, cuts off - destroys the pin 3, opening the cavity - a blind channel 4.

After the dividing plug is planted on the stop ring (the stop ring is not shown conventionally in Fig. 1), the pressure in the casing and body is increased to the design and drilling fluid through the cavity 4 of the destroyed pin 3, expanding the elastic cuff 5, enters the annular chamber 8. In this case, the screws 10 and the pusher 7 are cut off, deforming the elastic cuff 5, brings the device into working position.

To exclude the possibility of extruding the remaining part of the pin 3 into the annular chamber 8 and disruption of the elastic cuff 5, which in this case acts as a check valve, the outer annular collar 19 of the hollow shear pin 3, located in the outer part of the radial hole 2 of the housing 1, is rolled or chiseled ( figure 2).

After the overpressure in the casing and, accordingly, the cavity of the housing 1, the elastic cuff 5 eliminates the leakage of liquid from the annular chamber 8 and fixes the final position of the pusher 7.

A distinctive feature of the proposed design is its versatility in use with many snap-in casing rigs, as well as the ability to reliably protect the device from premature operation during crimping and in the event of an unexpected increase in pressure in the string during its descent into the well.

In addition, this device can be reliably installed in a casing with a minimum wall thickness of up to 5 mm, which significantly expands the scope of its application, especially in shank suspensions, where, for example, the casing thickness does not exceed 6 mm (for a PHN102 shank, the outer diameter of the pipe 102 mm, inner 90 mm).

Claims (8)

1. A device for actuating a tooling assembly of a casing string of a well, comprising a housing with a radial hole, at least one, a hollow shear pin overlapping the radial hole inside the housing and protruding into the housing, an elastic sleeve overlapping the radial hole outside the housing and fixed on it , a pusher forming with the housing, against its radial hole with an elastic cuff, an annular cavity, while the pusher is fixed in the transport position of the device relative to the body The whisker has the possibility of axial movement in the working position of the device for interacting with the casing rig assembly when the body cavity communicates with the annular cavity through the cavity of the destroyed shear pin and fixing the casing rig assembly in its working position. 2. The device according to claim 1, characterized in that a packer is adopted as a casing rig assembly. 3. The device according to claim 1, characterized in that the anchor is adopted as the casing rig assembly. 4. The device according to claim 1, characterized in that a sleeve for blocking or opening a hole for cementing is adopted as a snap-in unit for the casing of the well. 5. The device according to claim 1, characterized in that the radial hole of the housing is made stepwise, having a diameter on the outside of the housing that is larger than the diameter inside the housing, a sealing ring is placed in the radial hole on its stage, and the hollow shear pin is made with a reciprocal step in the wall of the housing and has on the outer surface protruding into the housing, a sleeve on a threaded connection, installed with an interference fit to interact with the inner wall of the housing and ensure the necessary deformation of the sealing ring. 6. The device according to claim 5, characterized in that the sleeve is made with an outer ball surface or in the form of a split segment. 7. The device according to claim 5, characterized in that the hollow shear pin on the outside of the housing has a means that prevents the entry of destroyed elements when the device is triggered into the annular cavity. 8. The device according to claim 7, characterized in that the hollow shear pin on the outside of the housing is milled or rolled.

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