RU48356U1 - PACKING DEVICE FOR ADDITIONAL CASING - Google Patents

Abstract

The proposal relates to the oil and gas industry, namely, to the means of restoring the wells' operability and may find application when launching additional casing strings (DOK) into wells whose casing strings have become unusable. Packing device DOK consists of a packer, consisting of a housing equipped with an internal cylindrical selection and technological holes, with a cuff placed on its outer surface, made by the team in the form of alternating elastic and rigid rings. Above the cuff is a movable stop associated with the drive. The housing, on top, is connected to the DOK via a coupling and is equipped with technological windows. The movable stop is rigidly connected through the technological windows, by means of shear elements installed in them with the drive, which is made in the form of a cup mounted in the housing with the possibility of axial movement and equipped with a check valve, which passes from the bottom up. The movable emphasis is made with the possibility of fixing from displacement upward relative to the housing, due to the interaction in the working position of the locking ring located in the inner groove of the movable emphasis and serrated notches made on the outer surface of the housing. An emphasis is installed under the cuff, equipped with an inner ring groove. The axial movement of the stop relative to the housing is limited by a latch made of stoppers made in the form of balls with a diameter of 12-15 mm and a movable sleeve. The movable sleeve is installed in the inner cylindrical housing sample and connected to it by means of a shear screw. The stops are inserted into the technological openings of the housing and interact on the one hand with the inner annular groove of the stop, and on the other hand with a movable sleeve. In the case of removing the device from the well, the movable sleeve has the ability to interact with its lower end with spring-loaded gripping elements of the collet, which is installed with the possibility of limited axial movement in the upper outer cylindrical groove of the nipple. lowered into the well on the rope when removing the device. The nipple is additionally equipped with a middle and lower outer cylindrical grooves, while in the transport position in the middle outer cylindrical groove of the nipple there are spring-loaded gripping elements of the collet, and a ring is installed in the lower outer cylindrical groove of the nipple with the ability

axial movement down in the working position, and connected with it destructible element in the transport position. In the proposed device, when unpacking it, no increased upward forces are applied that can “tear” the cuff, thereby increasing the purity of the unpacking of the device, and therefore, when removing the device, the load on the lifting unit is reduced, which helps prevent possible complications and reduce time to remove the device and, as a result, reduce the cost of well repair.

Description

The proposal relates to the oil and gas industry, namely, to means for restoring the wells' operability and may find application in the descent of additional casing strings into wells, the casing strings of which have become unusable.

A packer device is known (certificate for a utility model of the Russian Federation No. 26075, IPC 7 E 21 B 33/12, publ. BI No. 31 dated 10.11.2002), comprising a main packer including a housing with an elastic sleeve located on its outer surface, movable the wedge cylinder associated with the drive, shear and sealing elements and stops, while the device is equipped with an additional packer, consisting of a housing connected via an adapter to the main packer body, with an elastic sleeve mounted on it, a movable wedge cylinder forming with the housing and Stepping on its outer surface gidrokameru connected via radial channels in the housing-pipe space.

The disadvantage of this device are:

firstly, the complexity of the design, due to the large number of nodes and parts, as well as a large number of shear elements, the violation of the sequence of destruction of which can lead to disruption of the packaging process;

secondly, if it is necessary to remove the device from the well (in the event of an leaky fit or leakage of the string during operation), there are difficulties associated with the fact that it is necessary to create very large axial forces directed upwards to destroy the shear elements installed below the main and additional packers, and during long-term operation the shear elements “boil”, and their destruction requires efforts much more than the calculated ones, therefore not every lifting unit can to cope with this task.

The closest in technical essence is a packer device for an additional casing string (RF patent for utility model. No. 41331, IPC 7 E 21 B 33/12, publ. BI No. 29 of 10/20/2004), containing a packer consisting of a housing with a cuff placed on its outer surface, on top of which there is a movable stop associated with the drive, and below - a stop fixed on the housing, while the housing is connected to an additional casing string and provided with technological windows, and the movable stop is made in the form of a cylinder fixed in trance sports

the position of the shear screws and rigidly connected through the technological windows with the drive, which is made in the form of a glass, hermetically mounted in the housing with the possibility of axial movement and equipped with a check valve, passing from the bottom up, while the cuff is made of a team in the form of alternating elastic and rigid rings, and movable the emphasis is made with the possibility of fixing from displacement upward relative to the housing in any working position, shear and sealing elements.

A significant drawback of this device, revealed from practical experience, is that during the operation of the well equipped with this device, leakage appears in the string. In this case, for the purpose of revision, it is necessary to remove the packer from the well, and there are difficulties associated with the need to create large axial forces directed upward to destroy the shear elements. In practice, it turns out that when an upward axial force is applied to an additional casing (DOC) to unpack the packer, the applied force exceeds the packer packing force in the radial direction relative to the worn casing. Not having achieved the destruction of the above shear elements of the DOK, and hence the packer located at its end, begin to move upward, being in constant contact with the walls of the worn casing, creating great effort on the load-lifting unit throughout the rise. In addition, due to close contact with the walls of the worn casing string, many parts of the packer are damaged.

The technical task of the utility model is to increase the reliability of unpacking the device and reduce the load on the lifting unit in the process of extracting it from the well.

The technical problem is solved by the proposed packer device of an additional casing string containing a packer, consisting of a housing with a cuff placed on its outer surface, made by the team in the form of alternating elastic and rigid rings, on top of which there is a movable stop associated with the drive, and below it is a stop fixed on the casing, while the casing is connected from above with an additional casing and is equipped with technological windows, and the movable stop is made in the form of a cylinder fixed in the transport dix shear screws and rigidly connected through the processing window with a drive which is configured as a sleeve sealingly mounted in the housing for axial movement and provided with a check valve that passes from bottom to top, the movable

the emphasis is made with the possibility of fixing from displacement upward relative to the housing, shear and sealing elements.

What is new is that the bottom case is equipped with an internal cylindrical selection and technological holes, and the stop is provided with an internal annular groove, while the axial movement of the stop relative to the case limits the latch made of stoppers and a movable sleeve, and the movable sleeve is installed in the inner cylindrical sample of the case and connected with it through a shear screw, while the stoppers are inserted into the technological holes of the housing and interact on the one hand with the inner annular groove of the stop, and on the other hand with a movable sleeve, and in the case of unpacking the device, the movable sleeve has the ability to interact with its lower end with spring-loaded gripping elements of the collet, which is installed with the possibility of limited axial movement in the upper outer cylindrical groove, which is equipped with a nipple, lowered into the well on the rope when removing the device, and the nipple is equipped with a middle and lower outer cylindrical grooves, while in the transport position in the middle outer cylinder Coy pin bore are arranged spring loaded gripping members of the collet and the lower outer cylindrical groove pin set ring having axially movable downward in the operating position and connected thereto breakable element in the transport position.

Figure 1 shows the proposed device in a longitudinal section before packing.

Figure 2 shows the proposed device in longitudinal section in a sealed state before removing it from the well.

The packer device of the additional casing string consists of a packer consisting of a housing 1 (see FIG. 1), equipped with an inner cylindrical selection 2 and technological holes 3, with a cuff 4 placed on its outer surface, made by the team in the form of alternating elastic 5 and rigid rings 6.

Above the cuff 4 there is a movable stop 7 connected to the drive 8. The housing 1 is connected to the DOK 9 from above by means of a coupling 10 and is equipped with technological windows 11. The movable stop 7 is made in the form of a cylinder fixed in transport position by shear screws 12 to the coupling 10. Movable the stop 7 is rigidly connected through the technological windows 11 by means of shear elements 13 installed in them with the drive 8, which is made in the form of a cup mounted in the housing 1 with the possibility of axial movement and equipped with a check valve 14, which passes from the bottom up . The movable stop 7 is made with the possibility of fixation from displacement upward relative to

the housing 1 in the working position, due to the interaction in the working position of the locking ring 15 located in the inner groove of the movable stop 7 and gear notches 16, made on the outer surface of the housing 1.

An emphasis 17 is provided under the cuff 4, provided with an internal annular groove 18. The axial movement of the emphasis 17 relative to the housing 1 is limited by a latch 19 made of stoppers 20 made in the form of balls with a diameter of 12-15 mm and a movable sleeve 21.

The movable sleeve 21 is installed in the inner cylindrical sample 2 of the housing 1 and connected to it by means of a shear screw 22. The stoppers 20 are inserted into the technological holes 3 of the housing 1 and interact on the one hand with the inner annular groove 18 of the stop 17, and on the other hand with the movable sleeve 21 .

In the case of unpacking the device, the movable sleeve 21 (see figure 2) has the ability to interact with its lower end 23 with spring-loaded, by means of spring plates 24 gripping elements 25 of the collet 26, which is installed with the possibility of limited axial movement in the upper outer cylindrical groove 27 of the nipple 28, which is released into the well on the rope 29 when removing the device.

The nipple 28 is additionally equipped with an average 30 and lower 31 outer cylindrical grooves, while the spring-loaded gripping elements 25 of the collet 26 are located in the transport position in the middle outer cylindrical groove 30 of the nipple 28, and a ring 32 is installed in the lower outer cylindrical groove 31 of the nipple 28, with axial moving down in the working position, and connected with it destructible element 33 in the transport position. The height of the gripping elements 25 is greater than the length of the joints in the DOK 9 couplings.

A union nut 34 is screwed onto the lower end of the housing 1. Unauthorized overflows of the working fluid are prevented by O-rings 35, 36.

The device operates as follows.

The device connected to the DOK 9 by means of the coupling 10 (see figure 1) is lowered into the casing, which is unsuitable for further operation (not shown in figures 1 and 2), so that the device is at a distance of 5-10 meters above the reservoir. During the descent of the device, the check valve 14 passes the fluid in the well from bottom to top in the DOK 9.

DOK 9 is fixed to the mouth, and a column head is screwed onto its upper end and an increased pressure is created inside the DOK 9 (up to 20.0 MPa), which, acting on the actuator 8, connected by shear elements 13 installed in the technological windows 11 of the housing 1, leads the movable stop 7. as a result of the movable

the emphasis 7, having destroyed the shear screws 12, begins to move downward, acting on the cuff 4 made by the team in the form of alternating elastic 5 and rigid rings 6. In this case, the elastic rings 5 are compressed and pressed against the walls of the casing. The sealing process is continued until, under the action of increased pressure in the DOK 9 acting on the actuator 8, the shear elements 13 collapse on the lower edge of the technological windows 11 of the housing 1, while the actuator 8 falls on the bottom of the well, and the locking ring 15 of the movable stop 7 clings to gear notches 16 of the housing 1, fixing the movement of the movable stop 7 upward relative to the housing 1. The sealing process is over. The drive 8 is made of cast iron and, if necessary, can be drilled.

After that, the system is checked for leaks.

After packing, the column head is turned away, the necessary equipment is lowered into the DOK 9 and the further operation of the well is continued.

In the event of a leaky fit or leakage in the packer device, or in the DOK 9 itself during the operation of the well, it becomes necessary to remove the revision device in order to further restore the well’s working capacity.

For this, a nipple 28 is lowered into the well on the rope 29, (see FIG. 2) in the upper outer cylindrical groove 27 of which a collet 26 is installed with a possibility of limited axial movement with gripping elements 25 spring-loaded by means of spring plates 24.

The descent of the nipple 28 in the DOK 9 is continued until the collet 26 with its gripping elements 25 comes out of the middle outer cylindrical groove 30 of the nipple 28 and, thanks to the spring plates 24, is not lower than the movable sleeve 21 in the inner cylindrical groove 2 of the housing 1, and the lower ends the gripping elements 25 will abut against the upper end of the ring 32 installed by means of the destructible element 33 in the transport position in the upper part of the lower outer cylindrical groove 31 of the nipple 28, as indicated by the sagging of the rope 29 n and the wellhead (not shown in FIGS. 1 and 2).

Then, using a geophysical elevator (not shown in FIGS. 1 and 2), the rope 29 is pulled upward, while the gripping elements 25 spring-loaded outward by spring plates 24 with their upper ends begin to interact with the lower end 23 of the movable sleeve 21. The rope 29 continues to be pulled up and when the calculated force is reached, the shear screw 22 is destroyed, as a result of which the movable sleeve 21 rises up to the stop along the inner cylindrical groove 2 of the housing

1. The latch 19 is released and the stoppers 20 located in the technological holes 3 are displaced inside the housing 1, leaving the interaction with the annular sampling 18 of the stop 17. The stoppers 20 fall on the bottom of the well, and the stop 17, under the action of elastic forces of elastic rings 5, cuffs 4 and its own weight, it descends down the body, and the elastic rings 5, returning to their original position, depart from the walls of the casing (not shown in Figs. 1 and 2). The process of unpacking the device is over.

To remove the nipple 28, the rope 29 is again pulled up and when the calculated tension of the rope 29 is reached, the destructible element 33 is cut off due to the fact that the lower ends of the gripping elements 25 act on the upper end of the ring 32, since the upper ends of the gripping elements 25 continue to interact with the lower end of the movable sleeve 21.

As a result of cutting the destructible element 33, the ring 32 goes down along the lower outer cylindrical groove 31 of the nipple 28, while at the same time they continue to pull the rope 29 upwards, in connection with which the gripping elements 25 of the collet 26 fall into the lower outer cylindrical groove 31 of the nipple 28, freeing themselves from interaction with the lower end of the movable sleeve 21, at this moment, the collet 26 also moves down the upper cylindrical groove 27 of the nipple 28. With a further tension of the rope 29, the gripping elements 25 located in the lower outer c The cylindrical groove 31 of the nipple 28 freely passes through the movable sleeve 21, after which the nipple 28 is freely removed from the well along the DOK 9.

In the proposed device, when unpacking it, no increased upward forces are applied that can “tear” the cuff, thereby increasing the reliability of unpacking the device, and therefore, when removing the device, the load on the lifting unit is reduced, which helps prevent possible complications and reduce time to remove the device and, as a result, reduce the cost of well repair.

Claims (1)

A packer device for an additional casing string, comprising a packer, consisting of a housing with a cuff placed on its outer surface, made by the team in the form of alternating elastic and rigid rings, on top of which there is a movable stop associated with the drive, and below the stop fixed on the housing, this housing is connected from above to an additional casing and is equipped with technological windows, and the movable stop is made in the form of a cylinder fixed in transport position by shear screws and rigidly connected about through technological windows with an actuator, which is made in the form of a glass, hermetically mounted in the housing with the possibility of axial movement and equipped with a check valve, passing from the bottom up, and the movable stop is made with the possibility of fixing from shifting upward relative to the housing, shear and sealing elements, characterized in that the casing from the bottom is equipped with an internal cylindrical selection and technological holes, and the emphasis is an internal annular groove, while the axial movement of the emphasis relative to the casing and limits the latch made of stoppers and a movable sleeve, and the movable sleeve is installed in the inner cylindrical sample of the housing and connected to it via a shear screw, while the stops are inserted into the technological holes of the housing and interact on the one hand with the inner annular groove of the stop, and on the other sides with a movable sleeve, and in the case of unpacking the device, the movable sleeve has the ability to interact with its lower end with spring-loaded gripping elements of the collet, which installed with limited axial movement in the upper outer cylindrical groove, which is equipped with a nipple that is lowered into the well on the rope when the device is removed, the nipple is equipped with a middle and lower outer cylindrical grooves, while the spring-loaded gripping elements are located in the transport position in the middle outer cylindrical groove of the nipple collet, and in the lower outer cylindrical groove of the nipple a ring is installed that has the possibility of axial movement down in the working position, and the destructible element connected to it in the transport position.