RU2483192C1 - Drillable packer - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: drillable packer includes a shaft with a notch on outside surface, a sealing element, upper and lower disruptive rams, with upper and lower cones, a movable upper support and a fixed lower support, a fastener in the form of split spring rings in an annular bore of the movable support, a nipple in an axial channel of the shaft, which is connected through the left adapter to a hollow plunger of a hydraulic setting device, a fixed support with a spring-loaded shoe valve in the form of a housing with radial holes and a sealing cup installed on the seat. The nipple is equipped with a pusher, with an annular bore at a connection point, in the axial channel of which there installed is a piston with a bar and a sleeve, which is equipped with radial holes and rigidly attached to the pusher. The shoe valve is equipped with a seat, at the connection point of the housing of the shoe valve with the nut equipped with a shell resting on the spring, in the axial channel of which there is a seat on the internal annular projection and a spring-loaded ball valve is installed. A sleeve is equipped with longitudinal slots on the end and passed through the axial channel of the seata to the axial channel of the shoe valve with possibility of the end interaction with the spring-loaded ball valve. The bar is passed through an axial channel of the sleeve so that it goes beyond its end and forms together with it an annular gap hydraulically attaching the cavity of the packer to the axial channel of the pusher.

EFFECT: avoiding conditions of occurrence of a hydraulic impact.

4 dwg

Description

The invention relates to the mining industry and is intended to overlap the annular space of oil and gas wells during insulation work.

Known drillable packer (see RF patent No. 20111792, M. class. E21B 33/12, publ. 04/30/1994, Bi No. 8).

The packer consists of a hollow barrel with sealing elements on the outer surface, a retainer plugged in the lower part, an inlet pipe with radial holes, a hydraulic cylinder with a piston, and a sleeve. The barrel is connected by means of a left-hand thread to the inlet pipe. The latch is made in the form of spring-loaded cams installed in the radial holes of the barrel under the inlet pipe, and a sleeve with an internal conical surface mounted with the possibility of interaction with the cams.

The packer on the pipe string is lowered into the well to a predetermined depth and, when excessive pressure is created, the hydraulic cylinder is moved downward relative to the nozzle and the barrel with compression of the sealing element and overlapping of the annular space of the well. The spring-loaded cams after passing through the sleeve diverge in the radial direction and fix the sealing element in a compressed, stressed state. Disadvantages:

- the slips are made of easily drilled material having less strength than the casing material. This reduces the reliability of the fixation of the packer inside the casing;

- the slips are cumulated into the sealing element, which, when deformed, can lead to leakage of rubber into the gaps, as there is no support from the expanding cone or extrusion washers;

- there is uneven contact along the perimeter of interaction with the inner surface of the casing pipe;

- disconnection of the hydraulic landing device from the packer is carried out by rotating the tubing string, which limits the scope in deviated and deviated wells, since it is difficult to control the torque.

Carrying out insulation work also implies the supply of the estimated volume of the insulating composition to the under-packer zone. In some cases, not all of the insulating composition enters the formation and it is necessary to remove it from the pipe tubing string and the annulus of the well by direct or reverse flushing, which is impossible when using this packer design, since the pipe string is rigidly connected to the packer.

Known drillable mechanical packer (see RF patent No. 2236556, M. CL E21B 33/12, publ. 09/20/2004), which is designed to block the annular space of oil and gas wells and the implementation of the technology of isolation of bottom water. A cuff-type check valve is installed in the axial channel of the packer barrel, which provides free passage of the insulating composition to the sub-packer zone, with the termination of this hydraulic connection with the axial channel of the packer barrel after the supply of the insulating composition under pressure.

Known drillable packer (see AS No. 1832148, M. class. E21B 33/12, publ. 08/07/1993 Bi No. 29) adopted by the authors for the prototype.

The device consists of a hollow cylindrical body with a threaded thread on the outer surface, a sealing element, extrusion washers, upper slips in the form of annular sectors with radial grooves and hooks. Above the upper slips there is an upper pusher. At the lower end of the hollow cylindrical body, lower slips are placed in the form of annular sectors connected by shear elements with a lower support, resting on a lower pusher rigidly connected to the pipe and shank, between which a shear ring is placed. The upper and lower pushers have clamps in the form of elastic split rings with a cross-section of a triangular profile, interacting with a similar thread on the outer surface of the housing when the packer is planted.

Using a shear ring, the packer attaches to the planting tool and is inserted into the well. When creating excess pressure in the landing tool, it acts on the pusher, and through the shear ring and pipe on the lower pusher. This leads to the landing of the packer with the deformation of the cuffs and the engagement of the slips from the casing and the destruction of the shear ring. This helps to detach the planting tool from the packer and remove it from the well. For pumping technological fluids into the formation into a well on a tubing, a device with a plunger is lowered with an input to the axial bore of the packer barrel. If it is necessary to free the axial channel of the casing of the well from the packer, it is drilled. Design disadvantages:

- the need for additional technological operations to lift the pipes together with the landing device and the descent into the well of technological equipment for insulation work;

- the design of the packer does not imply its equipping with a non-return valve-shutoff, which is necessary during insulation work, with the creation of excess pressure in the sub-packer area. Typically, part of the insulating composition may enter the axial channel of the packer barrel and the axial channel of the pipe tubing string in the event of an emergency.

The technical result that can be obtained by implementing the proposed invention is as follows:

- the possibility of lowering the drilled packer in an arrangement with a hydraulic landing device, with free filling of the tubing string with formation fluid;

- the possibility of a hydraulic landing of the drilled packer when the hydraulic connection of the well cavity with the axial channel of the pipe lift string is blocked;

- the ability to disconnect the hydraulic landing device from the drilled packer by breaking the packer barrel or by transmitting torque to the hollow plunger, which eliminates the occurrence of a hydraulic shock during landing;

- the ability to feed the insulating composition into the under-packer zone while maintaining the kinematic connection of the pusher with the packer barrel;

- the possibility of forming a hydraulic connection of the axial channel of the tubing string with the annular space of the well above the packer and removing excess volume of the insulating composition at the wellhead;

- termination of the hydraulic connection of the under-packer space with the over-packer space after depressurization in the axial channel of the pipe lift string;

An analysis of the inventive step showed the following:

- a packer is known (see AS No. 1112114, M. class. E21B 33/12, published 07.09.1984 Bi No. 33) in which there is a plug in the axial channel of the packer barrel that is removed to the surface by a catcher after the packer is planted;

- a packer is known (see RF patent No. 2162137, M. class. E21B 33/12, publ. Bi No. 2, 2002) in which a separating element is used in the form of a shear ring, through which the packer is connected to the landing tool.

The planting tool is then removed from the well. To carry out insulation work in the tubing, a special nipple is lowered into the well with its entry into the axial bore of the packer barrel and sealing the annular gap with the sealing rings.

The technical result is achieved by the fact that the drilled packer contains a barrel with a notch on the outer surface, upper and lower bursting dies with upper and lower cones, a sealing element, a latch with split spring rings in the bore of the movable support body, a hydraulic landing device connected to the left packer barrel sub, nipple. The fixed support is equipped with a spring-loaded check valve in the form of a housing with radial holes and a sealing collar mounted on the seat. The nipple is equipped with a pusher with an annular bore in the place of their connection and a piston with a rod in its axial channel, as well as a sleeve above the piston, rigidly connected to the pusher. The shoe valve is equipped with a seat at the junction of the housing with the nut, is equipped with a cup resting on a spring, in the axial channel of which a seat is made on the inner annular protrusion and a spring-loaded ball valve is installed. The sleeve at the lower end is provided with longitudinal grooves and passed into the axial channel of the seat with the possibility of end-face interaction with the spring-loaded ball valve, the rod is passed through the axial channel of the sleeve below the location of its end and forms an annular gap with it, hydraulically connecting the cavity of the glass with the axial channel of the pusher.

When conducting patent research on patent and scientific and technical literature, we did not find technical solutions that ensure the hydraulic connection of the well cavity with the axial channel of the pipe tubing when lowering the packer to the installation site; the possibility of hydraulic landing of the packer and the separation of the hydraulic landing device from it with the termination of the hydrodynamic connection of the sub-packer cavity with the axial channel of the pipe tubing string.

No technical solutions have also been found aimed at ensuring the supply of insulating composition to the under-packer zone when sealing the over-packer zone from entering the insulating composition from the axial channel of the packer barrel, the presence of a landing device nipple installed with the possibility of washing the pipe tubing and annulus from residues insulating composition, when the hydrodynamic connection of the under-packer space from the over-packer ceases.

The design of the drilled packer for insulation work in the interval of the reservoir is illustrated by drawings, which show:

- figure 1 - design drilled packer, in connection with a hydraulic landing device, at the time of descent into the well;

- figure 2 - design drilled packer at the time of its landing and separation from him a hydraulic landing device;

- figure 3 - the relative position of the parts of the packer during the technology of supplying the insulating composition in the interval of the reservoir;

- figure 4 - the relative position of the parts of the packer after the completion of repair and insulation work and the termination of the hydraulic connection of the under-packer zone from the over-packer.

The drilled packer consists of a barrel 1 with notches 2 on its outer side and an annular bore 3 in the place of communication with the left sub 4, which is connected with the hollow plunger 5, of a hydraulic landing device of known design (see Abubakirov V.F., Burimov Yu.G. ., Gnoevy A.L. et al. / Drilling equipment: Handbook in 2 volumes, Volume 2: “Drilling Tools.” M.: Publishing House Nedra. 2003. With 455).

On the packer’s barrel 1, a lower support 6 is installed from below, on which bursting dies 7 with anchor rings 8 are mounted sequentially. Inside the bursting dies 7, an expanding cone 9 is introduced, on which a set of sealing cuffs 10 and an upper expanding cone 11 are installed, which interacts with the upper set of bursting dies 12, with landing anchor rings 13. On the end of the bursting dies 12 rests the housing of the upper movable support 14 with split spring rings 15. On the outside on the upper movable housing second leg 14 is formed technological groove 16, into which the lower end of the support sleeve 17 of hydraulic landing gear.

A nipple 18 is connected into the axial channel of the left sub 4, connected with the lower end to the pusher 19, provided at the junction of them with an annular bore 20 and forming a movable connection with the barrel 1. A piston 21 with a rod 22 is installed in the axial channel of the pusher 19. In the axial channel of the lower support 6 with a seat 23, a shoe valve body 24 is installed with a sealing sleeve 25 fixed by a nut 26 provided with a cup 27 that is supported by a spring 28. At the junction of the nut 26 with a shoe valve 24, a Z-shaped seat 30 is fixed, you odyaschee in its axial passage, and on the end of which rests the lower end of the push rod 19. The axial channel 31, tappet 19 is fixed sleeve 32 with longitudinal grooves 33 on the lower end passed through the axial channel of the saddle 30, below the seat surface.

A shaft 22 is freely passed into the axial channel of the sleeve 32, resting on a ball valve 34 (see figure 2), which is supported by a spring 35 and sits on a seat 36 made on the inner protrusion 37 in the body of the cup 27. In the body of the shoe valve 24 body, radial holes 38, blocked in the initial position by the body of the pusher 19, in which the radial holes 39 are also made, for connecting the axial channel 31, the pusher 19 under the piston 21, with the axial channel 40 of the barrel 1 of the packer. The lower support 6 is provided with a sleeve 41, the cavity of which is constantly hydraulically connected by openings 42, in the body of the cup 27 with its axial channel.

In the transport position, when the drilled packer is lowered into the well, the ball valve 34 is exerted by the spring force 35 and is pressed against the end of the sleeve 32 due to the resulting pressure drop.

Between the inner surface of the sleeve 32 and the outer surface of the rod 22, an annular gap 43 is formed (see Figure 3), which hydraulically connects the cavity of the cup 27 with the axial channel 31 of the pusher 19. The cavity of the cup 27 is connected by holes 42 with the axial channel 44 of the sleeve 41, which communicates through the holes 45 in the body of the lower support with the cavity of the well.

The formation fluid during descent freely flows into the axial channel 31 of the pusher 19 with the rise and location of the piston 21 in the annular groove 20. Thus, the formation fluid freely fills the cavity of the pipes during the descent of the packer.

Work on planting the packer and conducting repair and insulation works.

Working fluid is supplied under pressure to the axial channel of the drill pipe string, which enters the axial channel of the hollow plunger 5 of the hydraulic landing device and then to the axial channel of the nipple 18.

The nipple 18 moves downward in the axial channel of the hollow plunger 5 with an impact on the end face of the seat 30 and moves down the landing valve 24 all the way to the lower support 6. At the same time, the piston 21 moves in the axial channel 31 with the action of the rod 22 on the ball valve 34 and its landing on the landing surface 36 in the cup 27. The force from the hydraulic landing device through the pusher 17 is communicated to the housing of the upper movable support 14 with its movement along the barrel 1 of the packer, the introduction of the landing cone 9 under the bursting dies 7 and their movement in the radio ln the direction until it comes into contact with the inner surface of the casing string of the landing anchor rings 8. Further moving downward carry out axial compression of the sealing lips 10 with overlapping the annular gap. After this, the connection between the bursting dies 12 during their interaction with the return landing cone 11 is removed and they are moved in the radial direction until they come into contact with the casing of the landing anchor rings 13. When moving the upper movable support 14, the split spring rings 15 slant with respect to the notches 2 barrel 1 and when landing the packer interacts with the nearest of the notches 2, fixing the packer inside the casing. After the packer has been planted through the left sub 4, the ultimate axial force is transmitted to the barrel 1 and it is destroyed at the place where the annular bore 3 is made. The left sub 4 is freed from interaction with the barrel 1, which allows the movement of the nipple 18 when interacting with the nut at its upper end. When the nipple 18 moves upward, the piston 21 together with the rod 22 under the influence of pressure drop and dead weight moves down in the axial channel 31 to enter the axial channel of the sleeve 32. The piston 21 is located below the cross section of the radial holes 39. This ensures hydraulic communication of the axial channel 31 of the pusher 19 with the axial bore 40 of the barrel 1. Under the action of a differential pressure, the sleeve 32 moves downward relative to the lower support 6 with compression of the spring 28 and with the location of the radial holes 38 below the level of the seat 23. Sealing The cuff 25 is located below the holes 45 in the lower support 6. This provides a hydraulic connection between the axial channel of the tubing and the under-packer space, which allows the supply of an insulating composition to the interval of the reservoir to isolate the formation water. In the case when the injectivity of the formation was less than the calculated one and part of the volume of the insulating composition remained in the axial channel of the tubing, move the pipe string up with the output of the nipple 18 from the axial channel 40 of the barrel 1 of the packer with the location of the radial holes 39 in the body of the pusher 19 above the installation site packer. By supplying washing liquid to the axial channel of the pipe tubing string, the remaining volume of the insulating composition is brought to the surface along the annulus. After lifting the nipple 18 from the axial channel 40 of the barrel 1 by the force of a compressed spring 35, the ball valve 34 sits on the seat 30 with the hydraulic connection of the under-packer zone ceased with the axial channel 40 of the barrel 1. By the force of the compressed spring 28, the nut 26 also moves upward relative to the guide bearing 6 with a sealing fit cuffs 25 on the saddle 23 and the termination of the hydraulic connection of the under-packer zone with the over-packer.

The landing gear with the nipple 18 and the associated pusher 19 are removed to the surface.

Such a constructive implementation of the landing device and its interaction with the packer allow the drillable packer to be planted without the use of shear saddles, which means that the conditions for the occurrence of water hammer are excluded.

Claims (1)

A drillable packer containing a barrel with a notch on the outer surface, a sealing element, upper and lower tearing dies, with upper and lower cones, a movable upper and fixed lower support, a retainer in the form of split spring rings in an annular bore of a movable support, a nipple in the axial bore of the barrel connected through a left sub with a hollow plunger of a hydraulic landing device, a fixed support with a spring-loaded shoe valve in the form of a housing with radial holes and a sealing collar, mouth mounted on the seat, characterized in that the nipple is equipped with a pusher with an annular bore at the junction, in the axial channel of which there is a piston with a rod and a sleeve provided with radial holes rigidly connected to the pusher, the shoe valve is equipped with a seat at the junction of the shoe valve body with a nut provided with a cup resting on a spring, in the axial channel of which a seat is made on the inner annular protrusion and a spring-loaded ball valve is installed, the sleeve being provided with longitudinal grooves on end and passed through the axial channel of the seat, into the axial channel of the shoe valve with the possibility of end interaction with the spring-loaded ball valve, and the rod is passed through the axial channel of the sleeve with an exit beyond its end and forms an annular gap with it, hydraulically connecting the packer cavity with the axial channel of the pusher.

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