Drillable packer. RU patent 2507375.

FIELD: oil-and-gas industry.

SUBSTANCE: drillable packer consists of mandrel with shoe at its bottom and spring-loaded check valve fitted inside mandrel axial channel. Top and bottom cutoff slips with expanding cones, seal element and movable support with the stack of split lock wings are fitted on said mandrel. Said mandrel has inner bore at bottom end. Mandrel axial channel accommodates hollow rod with extender and collet. Said extender has lengthwise grooves. Collet lugs have heads to interact with the mandrel inner bore. Besides, they interact with check valve cone in axial channel via extender grooves. Extender has throttling orifice and radial orifices there above and is arranged to get in end contact with shoe check valve. Said rod has adapter with adjusting nut and is coupled with mandrel by cut element.

EFFECT: packer protection against overpressure, tightness of production tubing, direct or back flushing of axial channel.

4 dwg

The invention relates to the oil and gas industry, and is intended for blocking the annulus wells during repair and isolation works.

Known packer (see A.S. №1.832.148 M class. 21 33/12, publ. 07.08.93,, bull. №29).

The device consists of a hollow cylindrical body with screw threads on the outer surface sealing element, extrusion washers, upper in the form of annular sectors with radial grooves and hooks. At the lower end of a hollow cylindrical body there are lower in the form of annular sectors elements with the bottom support, which relies on the lower pusher, rigidly connected with a pipe and shank, between which posted by ring. Upper and lower pushers have retainers in the form of elastic split rings with triangular cross-section, of interacting with a similar thread on the outer surface of the hull.

The work of the packer.

Packer with the help of rings attached to the planting device and at the Elevator column pipes down into the well. Create excessive pressure of the fluid with the action on the upper pusher, and through and nipple ring at the bottom pusher.

Perform deformation of the cuffs, the muzzle of the pins, connecting the upper and lower with the top and bottom support. Upper and lower move uniformly in a conical surfaces of the bearings was put in contact with the wall of the casing.

After deformation cuff washers and fasten a with casing is the destruction rings and disconnection of landing gear from the packer, which is extracted from the wells.

Depending on the technological operations are carried out by the repeated run into the well tubing, landing gear equipped with a plunger, for connection with a packer. After the work is done by pumping isolating liquid extract the plug, insulated zone from the wellbore.

When you need to free axial channel wellbore from packer, its (upper part) and using the capture of the drilling tool is extracted from wells.

Disadvantages devices:

- the need for further technological operations related to the roundtrip operations on equipping instrument tubing pipes and submission of the isolating liquid in zone;

- design of the packer does not imply the equipment check valve, which is necessary for carrying out isolation works, creating excessive pressure in the given interval. In this part of the insulating composition after pressure relief may be presented both in the axial bore packer and axial channel tubing pipes that can lead to an emergency situation;

- carrying out isolation works involves filing a definite volume of isolation ended in zone, which is not always the same as the actual amount that can take layer, In this case, this volume delete from the well in the direct or reverse flushing, that in applying this design packer to impossible.

Known design packer (see Pat. The Russian Federation №2011792, M class. 21 33/12, publ. 30.04.1994,, bull. №8).

Packer consists of a hollow trunk with a sealant on the outer side of the latch, inlet with a plug at the bottom, with radial holes, a hydraulic cylinder with a piston. The barrel is through the left of the thread with the inlet cone. The clamp is made in the form of spring-loaded Cams installed in the radial holes in the trunk under the inlet and shells, with the inner cone surface, installed with the possibility of interaction with Cams.

On the pillar of pipes packer descend into the well to the depth and when creating the excessive pressure cylinder of the move down from the pipe and the trunk, compacting sealing element and overlapping of the annulus.

After passing the sleeves spring-loaded Cams diverge in the radial direction and fix the sealing element in a compressed state.

Disadvantages of the construction:

- in the sealing element and its deformation of the possible penetration of the rubber in the gaps, because there is no support from the side of cone or extrusion washers;

- has place disparity pressing sealing element to the tube inner surface of the casing;

- detach hydraulic landing gear from the packer, is carried out by the rotation of the tubing pipes, which limits the use of the packer in warped and deviated wells, due to the complexity of control torque;

- it is also difficult to remove from the tubing pipes excessive isolation of the composition, which has not managed to push into the reservoir.

Known design technological packer (see «Development of a variety of technological packers for carrying out isolation of bottom waters and conservation of the wells». Exploratory drilling on land and continental shelf of Russia. Trudy inst. NPO «Drilling». .14, Krasnodar 2005, .377-383 accepted by the authors and the applicant for the prototype).

packer consists of a trunk, with casing Shoe valve is running valve is the shape of the glass with elastic cuff, a member of the Allen contact with the landing of a saddle. Non-return valve is connected with the casing Shoe valve, shear element. On the trunk installed lower explosive dies, the lower slopes with expanding cone, sealing element on which rests the upper slopes with expanding cone, part of the conical part of the inside of the cone upper explosive dice. On the upper explosive die relies mobile base, with service locking split rings, separated by rings. The barrel is equipped with near incisions on the outside, interact with locking slotted ring.

Mobile base associated with the barrel of a shear element. The upper and lower explosive die connected to each other ring jumpers.

On the external side of discontinuous dice made two annular grooves in which the ring, with sharp edges facing the wall of the pipe casing.

Packer is connected with the barrel of a hydraulic landing gear and lowered into the well.

When applying excessive pressure in the Elevator column pipes and landing gear, occurs enter the lower cone under the bursting of a die, with the destruction of the ring jumpers and displaying them to enter into contact with the wall of the pipe casing split locking rings, with their introduction into the body at a depth of Δ>0,15 up to 0,2 mm

Further axial loading perform deformation of the sealing element, with an overlap of the annular gap between the casing and tubing casing pipes. After that comes the destruction of the ring jumper upper explosive dice and enter into cooperation split collars with a pipe casing.

When this occurs, move the mobile supports the barrel and interaction with the knurled retaining rings. After landing packer, retaining rings are injected into the cuts, with detent in the stress state of the sealing element and an anchor node, which consists of the upper and lower explosive die. To ensure the hydraulic connection of the axial barrel packer with area increase the pressure of the working fluid, with the destruction of element and moving down the check valve. Elastic cuff departs from the fitting saddle, with the formation of hydraulic connection of the axial channel tubing, with area and submission of isolation ended in the formation.

After the non-return valve pressure relief effort of a spring, sits down into the saddle.

Hydraulic landing gear when it is detached from the packer by the destruction of bridges, completed on the trunk, on the location of the incisions, at the moment of the final fixing of the packer.

The disadvantages of the design of the device include the following:

technological drilling on the trunk of the packer is of the conditions for obtaining jumpers, given the cross-section, sufficient to keep the connection of hydraulic landing gear with a packer until its landing. This requires additional work on determination of strength characteristics of the material from which made a packer, and then determine the depth of the ring groove.

The technical result, which can be obtained by the implementation of the proposed invention consists in the following:

- possibility of hydraulic landing by planting tool, with the protection of trunk packer pressure, as it is made from grey cast iron, which has sufficiently low strength properties;

- undocking planting tool from the trunk of the packer, preserving the tightness of tubing pipes and a possibility of isolation ended in zone;

- possibility cutoff zone from axial barrel packer after the technological process;

- possibility of direct or backwashing axial channel tubing pipes from surplus insulating composition, with the formation of hydrodynamic connection between the axial channel tubing pipes and space wells;

- possibility of multiple application landing valve, extracted from the boreholes with your instrument.

The technical result is achieved by the fact that the device consists of a trunk with hollow shaft in axial channel and check valve. On the lower end of the barrel is installed Shoe with a spring-loaded non-return valve, the upper and lower explosive die, expanding cone, sealing element, mobile base with service locking split rings.

Hollow spindle is equipped with economies in threaded coupling for connection with hydraulic landing gear.

The barrel is equipped with inner recess at the lower end. Hollow spindle is equipped with an extension cord with longitudinal grooves and collets, the petals of which are equipped with heads, installed with the possibility of interaction with the barrel of the place of performance of the internal boring and through longitudinal grooves in the body of an extension cord with the support of cone-return valve is installed in its axial channel.

- figure 1 - structure of the packer in the context of the original transport position;

- figure 2 - the design of the unit in position overlap annulus sealing element and fixation in the axial channel of casing;

- figure 3 - the design of the unit in position detach hydraulic landing gear, while its relationship with the barrel of the packer;

- the 4 - design of the device in the working position of the details, after repair and isolation works and closed reverse valve.

packer consists of 1 barrel, at the lower end of which is installed housing 2 Shoe valve in the axial channel 3 which is a spring-loaded non-return valve 4, based on the nut 5.

On the external side of the barrel 1 performed notch 6 and installed sequentially lower explosive die 7, slopes with expanding cone 8 associated with the barrel 1 shear element 9. On its surface chop relies sealing element 10, in the form of a set of rubber cylinders. Top set slopes with expanding cone 11 that underpins the upper explosive die 12. On the last top relies split mobile base 13, supplied with the package split retaining a stake of 14 with bevels, converted to 6 on the trunk of 1. The axis of the barrel 1 skipped a hollow rod 15, with adapter 16 at the upper end, a member of its lower end in boring 17 in the barrel 1 and the associated shear element 18. On the external side of the transition clutch 16 installed adjustment nut 19, with the possibility of the mechanical interaction with the barrel 1.

At the lower end of a hollow rod 15 installed extension cable 20 and secured housing collets 21, petals 22 their heads 23 within the domestic boring 24 in the axial trunk channel 1. Extension cable 20 with lateral grooves 25, in the omitted head collets 21. In the axial channel 26 extension 20 the housing 27-return valve 28, on which foreign parties rely head 23 petals 22 collets 21.

Housing 27-return valve 28 associated with extension 20 shear element 29 and equipped with sealant 30 blocking the annular space between the inner surface of the housing 27-return valve 28.

In the body of the extension cable 20 radial holes 31, connecting the cavity 32 above a spring-loaded non-return valve 4, with axial channel 26 extension cable 20. Through the holes 33 in the body cavity 2 32 connects with space.

Axial extension cable channel 26 20 bottom is covered throttle washer 34. Himself extension cable 20, in the original position interacts with a spring-loaded non-return valve 4 and pressed it to the nut 5.

Housing 27-return valve 28, equipped with a saddle 35 and a cage of 36 with radial holes 37 connecting its internal cavity with axial channel 26 extension cable 20. Transition coupling 16, supplied with the connecting thread 38 to connect with hydraulic landing gear (figures not shown).

On the external side of the split mobile supports 13 completed drilling of the 39 to support the latest sleeves of hydraulic landing gear. The annular gap between the trunk 1 and the body of a hollow rod 15 blocked sealing rings 40.

Work packer.

Device connection thread 38 in transition coupling 16 connects with hydraulic landing gear and is entered into the well, with the location at a specified depth.

During the descent device in the hole there is a free flow of fluid through the channels 34 and radial holes 31 in the body of the extension cable 20, then through the non-return valve 28, in the axial channel hollow rod 15.

When applying excess pressure of working liquid in hydraulic landing gear and axial channel hollow rod 15 does boarding packer. When it moves down the demountable mobile supports 13 relative to the trunk 1 with slippage split collars and 14 for the knurl 6. Axial compression move discontinuous dice 7 to the wall of the casing, by entering inside cone 8 and compression of sealing element 10 to education reed contact with the wall of the casing. Then there is the thrust of the upper explosive dice 12 on the upper slopes with expanding cone 11 and their deformation in the radial direction, before the formation of bonding with metal casing pipe.

Split-collars 14 the edges are inside the notches 6 on the stem 1, with detent position of parts of the packer is in working condition. Raises the pressure in the axial channel hollow rod 15, with the transfer of the cross-sectional area of housing 27-return valve 28, with the destruction of item 29, which leads to move it down relative to the heads 23 petals 22, collets 21 and putting heads 23 inside longitudinal grooves 25, with the output from the internal boring 24 in the trunk of 1. Axial extension cable channel 26 20 hydraulically connected with axial channel 33 of the body 2 Shoe valve, and through channels 34 in his body with a cavity well. Thus, it provides a free feed of fluid in zone and further into the reservoir. After pumping the working fluid and the preservation of excess pressure in the axial channel hollow rod 15, tension tubing execute moving up hydraulic landing gear and associated with him, through the adapter clutch 16, hollow rod 15 with extension 20 and collet 21. Spring-loaded check valve 4 spring moves up in the axial channel 3 housing 2 Shoe valve, with the termination of hydraulic connection through the holes 34, cavity well, with the cavity of the pipes tubing string.

Further moving up the output of a hollow rod 15 of the axial channel 1 barrel. If you need to wash flushing pipes tubing string from the remnants of the working fluid, served under pressure washing liquid inside of the device with access through radial holes 31 in the body of the extension cable 20 in the annular space of a well.

When you need to free axial channel of casing from packer, the latter may be .

packer, consisting of the barrel with a hollow shaft in axial channel and Shoe, with a spring-loaded non-return valve, the lower and upper explosive dice, with expander sleeve cones, sealing element, mobile support with service locking split rings, characterized in that the barrel is equipped with inner recess at the lower end of the hollow spindle is equipped with an extension cord with longitudinal grooves and collets, the petals of which are equipped with heads, installed with the possibility of communication with the internal free rotation of the barrel and through longitudinal grooves extension, based on the case of a non-return valve in its axial channel extension cable supplied with the throttle washer and radial holes over it and installed with the possibility of the mechanical contact with non-return valve Shoe, and a hollow rod is supplied adapter with an adjusting nut and is associated with the barrel of a shear element.