Packer

FIELD: oil production industry, particularly means for dividing an annular space and a tube space in flowing, gaslift, and beam wells.

SUBSTANCE: packer includes shaft with outer bored surface and bead and sealing members supported by the bead. Packer also has air cylinder forming annular cavity together with packer shaft. Cavity is connected with shaft interior through radial channels. Packer includes anchoring means. Lower anchoring means includes cone with slips and slip holder having bored inner orifice and threaded orifices. Lower anchoring means rests upon the bead and is connected to the shaft by shear screws installed in threaded orifices of slip holder. Shaft defines inner bored diameter and includes sliding bush located inside shaft. Shaft is provided with lower and upper grooves for sealing rings receiving and with outer grooves for cams and additional shear screws installation. Outer grooves are located between lower and upper ones. Slots are formed below bead on outer shaft surface for installing cams with limited radial travel. Threaded orifices are formed on outer shaft surface above inner groove thereof. Arranged into groove are additional shear screws to secure sliding bush in its initial position. The slip holder is freely installed on shaft or is spring-loaded. Support-moving bush is installed in inner bored orifice of slip holder between shear screws and cams. Support-moving bush is provided with facet formed from cam side and contacts with cams along mating facets upon shearing of shear screws. Free travel between cams and end of support-moving bush exceeds shear screw diameters to provide shearing thereof. When sliding bush is installed in fixed position cams extend above an outer shaft surface generator to provide displacement of support-moving bush and cut of shear screws. When sliding bush is located in operating position cams are located below outer shaft surface generator and move in radial direction into outer groove of sliding bush to provide free cam movement under support-moving bush and shear screws.

EFFECT: reduced number of lowering and lifting operations and breakdowns in the case or packer separation or during packer pulling out of well.

18 cl, 7 dwg

The invention relates to the oil and gas industry, in particular to techniques for the extraction of oil, gas and gas condensate, and can be used for annular isolation and in-line spaces in the fountain, gas lift, pumping or injection well to one or more operational objects (layers or interlayers).

Known hydraulic packer (A.S. No. 1788207, E 21 33/12, bull.№2, g.), containing a hollow shaft with radial canals and circular groove is installed in the annular groove of the barrel for axial movement of the upper zakalivayuschie device in the form of a cone with the dies mounted on the shaft sealing elements in the form of cuffs, bottom zakalivayuschie device in the form of a cone with dice and plashkoderzhatelya with the shank, forming with the barrel of the hydraulic cylinder, which is connected through radial channels with the cavity of the barrel, and a collet mounted in the shank plashkoderzhatelya, locking it against the trunk.

Known hydraulic packer reusable actions (RF Patent No. 2018628, E 21 33/12, bull.№16, g.), including a hollow shaft with radial channels and a clutch mounted on the shaft sealing element in the form of a cuff placed on the barrel for movement and associated locking element upper cone with dice and pescaderia elem top saarialho device, installed under the lower sealing element zakalivayuschie device in the form of a cone with dice and bottom plashkoderzhatelya placed concentric with the barrel cylinder, forming a barrel with a ring cavity associated with the cavity of the barrel through the radial channels.

These packers have low reliability at high thermodynamic conditions in the wells, as they are made without shear screws, which leads to the spontaneous liberation of the packers in the case of insufficient movement of the barrel to the top of the die when shortening the length of the pipe string.

Known packer hydraulic type PD-YAGAMI (the Directory. Equipment for gas lift operation of oil wells. Containertypes, M., 1991), including a hollow barrel with a machined diameter and clamp installed on it sealing elements, the cylinder forming with the barrel ring cavity associated with the cavity of the barrel through the radial channels, the upper and lower zakalivayuschie device, the upper of which is made in the form of an anchor, and lower - in the form of a cone with dice and plashkoderzhatelya with the annular bore and the screw holes made with emphasis on the shoulder of the barrel and connected with the barrel of shear screws for the collapse of the packer installed in threaded holes plashkoderzhatelya. Designs have been fitted the th in the borehole hydraulic packer (for example, type PD-YAGAMI etc) should be freed by the tightness of his trunk up with a load of 10-12 tons to ensure slice shear screws (M8 quantity 10 pieces) and move it to the trunk relative to the die. However, in practice, after the operation of the hydraulic packer more than one year for his release, in major cases, you will need to load more than 20 tons (in particular, due to the deposition of sand over his sealing elements), which often leads to breakage of the pipe string. Due to this reason, in some cases, when the Assembly of the packer set shear screws M8 in smaller quantities to avoid complications from his breakdown, which in turn, can lead to spontaneous release of the packer at its planting and/or operation of the well. Its anchor is powered by an external pedacinho pressure, which when planting can occur spontaneous respecrive.

The aim of the invention is to increase reliability in the process of removing it from the well due to the possibility of the release of the packer or by mechanical tightness of trunk under heavy load for slice shear screws plashkoderzhatelya, or using rope techniques and mechanical tightness of trunk under a small load, avoiding slice shear screws plashkoderzhatelya, and improve reliability in the setting process, and packer by eliminating the possibility of inadvertent release.

The positive effect from the use of the packer is to reduce the number of accidents at disrupting or removing the packer from the well and, accordingly, capital repair for emergency response, as well as to increase its service life, overhaul period wells and production fluid.

This goal is achieved by the fact that the reliability of the release of the packer and its barrel is made with the inner diameter of the bore, in which is mounted a sliding sleeve with the lower and upper outer grooves for o-rings, and between the outer grooves under the Cams to allow radial movement and under additional shear screws. When this lower clamp machined on the outer diameter of the barrel made the grooves in which the outer diameter of the sliding sleeve mounted Cams with limited radial passage and made machined on the outer diameter of the screw holes on its internal groove in which is installed an additional shear screws for fixing the initial position of the sliding sleeve. In the bore internal diameter plashkoderzhatelya between shear screws and Cams installed anchor is movable sleeve is chamfered side Cams in contact with the Cams by mutual chamfers when the slice shear screws.

This free play between kulack the mi and the end anchor is movable sleeve more than the diameter of the shear screws to be cut. When the original fixed position of the sliding sleeve Cams protrude above forming the machined outer diameter of the barrel with the ability to move the support is movable sleeve and slice shear screws at the failure of the packer by tightness and movement of his trunk to the top of the die. And in operating position, the sliding sleeve Cams are buried under the generatrix of the machined outer diameter of the shaft, radially moving into the outer groove of the sliding sleeve, ensuring their free passage under reference-movable sleeve and shear screws with the release of the packer by means of mechanical or hydraulic impacts on the sliding sleeve and move it from the source into the working position, cutting off the additional shear screws.

For the technological design of the packer and its barrel can be made of two (or more) parts, interconnected rigidly by a thread, and the bore inner diameter and the outer groove diameter of the barrel is made on the bottom of its parts. Depending on the manufacturing technology of the packer grooves machined on the outer diameter of the shaft and, respectively, the Cams can be made transverse or longitudinal of the same geometric shape, and the Cams are installed in the slots from the inside or outside of the barrel and ispolneny in the form of a segment of a conic form, no shoulder or rectangular ribs with two sides in the lower part thereof and chamfers on both sides of the upper part thereof, or run concentrically in the form of conical or cylindrical shape. A sliding sleeve is made with a landing surface for the landing shock of the cable tool or removable check valve, respectively, to move the mechanical or hydraulic action. A sliding sleeve, in the particular case, can be made with an elastic element in the form of a collet and, accordingly, in the trunk made one or two grooves under the petals of the collet. The elastic element is a sliding sleeve to cut additional shear screws and fixing the sliding sleeve in the working position may have an internal diameter under a shock of cable tool (a hammer) is less than the internal diameter of the sliding sleeve, to move the sliding sleeve down until it stops in the barrel (this percussion instrument in the form of a sledge hammer through the barrel goes down and gives information about the release of the packer). Also the inner diameter of the sliding sleeve (without the elastic element can be made larger than the inner diameter of the barrel under it, for the possibility of release (preload) and passing through the trunk cable drums instrument in the form of a pusher after moving the sliding sleeve down until it stops in the barrel (also for information about the release of the packer). The Cams can be made with retirementsystem for ease of installation during Assembly of the packer. The outer groove of the sliding sleeve under the Cams and additional shear screws are ring on its circumference. The trunk can be performed two or three groove under the Cams. For manufacturability in the trunk under the sliding sleeve can be mounted stop it stops moving down. The support is movable sleeve in the plashkoderzhatelya can be made cylindrical with an external groove or a groove for the shear screws. Shear screws can be made with a collar to limit their progress down when installed in the threaded holes plashkoderzhatelya. The trunk can be performed outside the groove and set the lock ring to lock plashkoderzhatelya. For, if necessary, temporarily suspend the operation of the packer barrel is made with additional inner diameter of the bore and a landing surface for the removable installation of a hollow tube (e.g., using rope techniques), sealed radial decoupler channels stem from its cavity. Zakalivayuschie device installed above and below the sealing element. To improve the reliability of the landing of the packer and exceptions spontaneous his respitrace zakalivayuschie device above the sealing elements are in the form of an anchor (for example, from one or two parts), applicable as from the internal and the t external pressure of the barrel. Die saarialho device implemented with immediate, or acute, or obtuse angle one-way or two-way direction of their teeth, and their hardness is greater than or equal to the hardness of production casing descent packer for reliable grip and prevent movement of the packer as down and up.

Figure 1 shows a General view of the packer; figure 2 - zakalivayuschie the packer device with a sliding sleeve; figure 3 - zakalivayuschie the packer device with a sliding sleeve with an elastic element (option 1); figure 4 - zakalivayuschie the packer device with a sliding sleeve with an elastic element (option 2); figure 5 - zakalivayuschie the packer device with a sliding sleeve with the lower clamp; figure 6 - zakalivayuschie the packer device with the movable sleeve in the plashkoderzhatelya; 7 - section a-a figure 6.

Packer (Fig.1-7) includes a barrel 1 (for example, of two interconnected parts with machined outer diameter 2 and the collar 3. The barrel 1 has multiple sealing elements 4 and the cylinder 5, which forms with the barrel 1 ring cavity 6 that is associated with the cavity 7 of the barrel 1 through the radial channels 8. The barrel 1 is also installed zakalivayuschie device, the upper of which is made in the form of anchor 9 (in the particular case, the upper die can operate from internal is Alenia, and the lower die, on the contrary, from the external pedacinho pressure above the sealing elements 4, and the other below the sealing elements 4 in the form of a cone 10 with the dies 11 (one-way or two-way direction of their teeth) and plashkoderzhatelya 12 with the inner diameter of the bore 13 and the screw holes 14. The plashkoderzhatelya 12 is made with emphasis on the shoulder 3 (in the particular case, the retaining split ring 15 in figure 3) and is connected with the barrel 1 shear screws 16 (smpeg)installed in the threaded holes 14. The barrel 1 has an inner diameter of the bore 17 with the inner grooves 18, 19, 20 (smfh. 2-4). While in the lower part of the trunk 1 (below or above) installed a sliding sleeve 21 with the lower and upper outer grooves 22, 23 under the sealing ring 24, and between the outer groove 25 under Cams (stoppers) 26 for radial movement (smfg). A sliding sleeve 21 is made with or without elastic element 27 (for example, collets etc) and has an external groove 28 under additional shear screws 29. Below the collar 3 of the machined outer diameter 2 of the barrel 1 has grooves 30 (see figure 3), in which the outer diameter of the sliding sleeve 21 is installed the Cams 26 with limited radial motion, with or without the screw hole 31 for mounting. On the machined outer diameter 2 of the barrel 1 is made, the thread is haunted holes 32 on its inner groove 20, have additional shear screws 29 for fixing the sliding sleeve 21 at its original position. In the bore internal diameter 13 plashkoderzhatelya 12 (smpeg) between the shear screws 16 and Cams 26 are installed anchor is movable sleeve 33 with the chamfer side Cam 26 in contact with the Cams 26 by mutual chamfers when the slice shear screws 16. This free play between the Cams 26 and the end anchor is movable sleeve 33 is made larger than the diameter of the shear screws 16 to be cut. In the inner diameter of the sliding sleeve 21 (smpeg) or the elastic element 27 (smpeg, 4) the chamfer 34 or collar 35 the impact of cable tool, or the landing surface 36 under a removable check valve (for example, type CAT, And etc) to move a mechanical or hydraulic action.

Elastic element 27 to cut additional shear screws 29, move, and hold it in the groove 18 (working position), in the particular case, is made with an inner diameter (under the shock of the cable tool in the form of a sledge hammer) is less than the internal diameter of the sliding sleeve 21. As well as the inner diameter of the collar 35 (5) of the sliding sleeve 21 is made larger than the inner diameter 37 of the barrel 1 for liberation drums of cable tool in the form of a plunger with a decrease in the diameter In the barrel 1 (smpeg) below (or above) the sliding sleeve 21 may be provided with a stopper 38 (for example, in the form of a split ring) to stop when moving up or down. Also on the trunk 1 (smpeg) performed outside groove 39 and with the retaining split ring 15 for emphasis plashkoderzhatelya 12.

The barrel 1 (smfh), in the particular case, completed with additional inner diameter of the bore and the seat surface 40 above and below the radial channels 8 to install the cable removable hollow tube (with upper and lower sealing sleeves), hermetically divisive radial channels 8 of the barrel 1 from its cavity 7, to exclude, if necessary, the possibility of actuation of the packer (for example, when the casing pressure testing of pipes, planting and crimp another packer etc).

The plashkoderzhatelya 12 (smpeg) may be spring-loaded helical spring 41. The barrel 1 from the bottom is equipped with a sub-centralizer 42.

Packer works (smpeg) as follows. It lowered into the well to the desired depth and create excessive pressure in the string of pipe to pressure its operation. While this pressure acts through the cavity 7 and the radial channels 8 in the cavity 6 of the cylinder 5, which moves from one side of the cone 10 under the die 11, and the other side to the pressure of the sealing elements 4, resulting in the die 11 and the sealing lip 4 tightly against the wellbore, razor is up tightly pipe and the annulus between them. In the process, the armature 9 it dies, triggered by internal pressure, does not allow you to move the packer up as when landing, and during its operation (when the injection of the working environment or the production fluid in the well. And die anchors 9, triggered from external pressure packer), to preclude movement of the packer up only in the course of its operation. To exclude the possibility of moving the packer up (for example, when the injection of cold water into the reservoir or reservoirs, wells) and spontaneous release him when thermobaric conditions it is possible to lift the pipe head with the column pipe at low elevation (1 m) from the crosses, and then to set the packer, creating excess pressure in the cavity 7 of the barrel 1, and then lower tubular cylinder with a column of pipes on the d-pad to create the required axial load (e.g., 5-8 t) on the packer from the weight of the pipe string, which excludes the possibility of spontaneous breakdown (release) of the packer in the operation well.

The release liner can be performed in two ways. In the first case (smpeg) create great tension shaft 1 up by raising the tubing and provide a slice shear screws 16 when moving the barrel 1 with Cams 26 and through them support-movable sleeve 33 relative to the dies 11. After cutting shear screws 16 with the ox 1 with the move frees up the cone 10 from the dies 11, which, respectively, are released from contact with the wellbore. When this sealing elements 4 is returned from the deformed state to its original position, thereby releasing the packer.

In the second case (smpeg) down into the well back (intake) valve (for example, type CAT or A) or percussion instrument in the form of a sledge hammer or plunger and hydraulic or mechanical means within the barrel 1 to move the sliding sleeve 21 from the initial position into the working position, cutting off the additional shear screws 29 or moving elastic element 27. Then give a slight interference fit on the shaft 1 by lifting the pipe string, with the Cams 26 are buried under the generatrix of the machined outer diameter 2 of the barrel 1, the radially moving into the outer groove 25 of the sliding sleeve 21, and provide a free passage under the control of the Cam is movable sleeve 33 and shear screws 16. Next, the barrel 1 with the move also frees up the cone 10 from the dies 11, respectively, are released from contact with the wellbore. After displacement by hydraulic sliding sleeve 21 with a check valve (e.g., CPR And or etc) down until it stops in the barrel 1, in the particular case, the message can occur between the pipe and the external cavity of the barrel 1 of the packer through the radial channels (if available), location is defined between the sealing elements of the sliding sleeve 21 (smpeg) for information about the release of the packer due to the pressure drop in the barrel 1.

It should also be noted (smpeg)that temporarily prevent actuation of the packer when the pressure in the string of pipe in a landing surface 40 of the barrel 1 set of removable hollow blank tube (for example, using the rope technique) and hermetically isolate the cavity 6 of the cylinder 5 from the cavity 7 of the barrel 1.

When the presence of the spring 41 (smpeg) packer can be re-installed after slice shear screws 16, given that the plashkoderzhatelya 12 is in its upper position under the force of the spring 41. After creating the inside of the barrel 1 pressure cone 10 moving down, provides the contact plates 11 with the wellbore.

1. Packer, comprising a barrel with a machined outer diameter and clamp installed on it sealing elements, the cylinder forming with the barrel ring cavity associated with the cavity of the barrel through the radial channels, zakalivayuschie device, the lower of which consists of a cone with dice and plashkoderzhatelya with the bore inner diameter and the screw holes made with emphasis on the shoulder and connected with the shaft shear screws installed in the threaded holes plashkoderzhatelya, characterized in that the barrel is made with the inner diameter of the bore, in which is mounted a sliding sleeve with the lower and upper outer ditches the AMI under the sealing ring, and between them, with outer grooves under the Cams to allow radial movement and under additional shear screws, while the lower clamp machined on the outer diameter of the barrel made the grooves in which the outer diameter of the sliding sleeve mounted Cams with limited radial passage and made machined on the outer diameter of the screw holes on its internal groove in which is installed an additional shear screws for fixing the initial position of the sliding sleeve and the bore inner diameter plashkoderzhatelya between shear screws and Cams installed anchor is movable sleeve is chamfered side Cams in contact with the Cams by mutual chamfers at slice shear screws, while the free play between the Cams and the end anchor is movable sleeve is greater than the diameter of the shear screws to be cut, and when the original fixed position of the sliding sleeve Cams protrude above forming the machined outer diameter of the barrel with the ability to move the support is movable sleeve and slice shear screws at the failure of the packer by tightness and movement of his trunk to the top of the die, and in operating position, the sliding sleeve Cams are buried under the generatrix of the machined outer diameter of the shaft, radially moving naruzhno the groove of the sliding sleeve, providing free their passage under reference-movable sleeve and shear screws with the release of the packer by means of mechanical or hydraulic impacts on the sliding sleeve and move it from its initial position into the operating position, cutting off the additional shear screws.

2. Packer under item 1, characterized in that the barrel is made of at least two parts, connected by a hard-carving, and the bore inner diameter and the outer groove diameter of the barrel is made on the bottom of its parts.

3. Packer under item 1, characterized in that the grooves machined on the outer diameter of the shaft and, respectively, the Cams are made transverse or longitudinal of the same geometric shape, and the Cams are installed in the slots from the inside or outside of the barrel and made in the form of a segment of a conic form, no shoulder or rectangular ribs with two sides in the lower part thereof and chamfers on both sides of the upper parts thereof or made concentrically in the form of conical or cylindrical shape.

4. Packer under item 1, characterized in that the sliding sleeve is made with a landing surface for the landing shock of the cable tool or removable check valve, respectively, to move the mechanical or hydraulic action.

5. Packer under item 1, characterized in that the MSE of isasa sleeve is made with an elastic element in the form of a collet, and accordingly, the barrel is made of at least one groove under the petals of the collet.

6. Packer under item 5, wherein the elastic element is a sliding sleeve to cut additional shear screws and fixing the sliding sleeve in the working position has an inner diameter of the impact of the cable tool is smaller than the internal diameter of the sliding sleeve.

7. Packer under item 1, characterized in that the inner diameter of the sliding sleeve is made larger than the inner diameter of the barrel under it, for the possibility of release and passage through the barrel shock rope tool in the form of a pusher after moving the sliding sleeve down until it stops.

8. Packer under item 1, characterized in that the Cams are made with a threaded hole for ease of installation.

9. Packer under item 1, characterized in that the outer groove of the sliding sleeve under the Cams and additional shear screws are ring on its circumference.

10. Packer under item 1, characterized in that the barrel is made two or three groove under the Cams.

11. Packer under item 1, characterized in that in the trunk under the sliding sleeve has a stop it stops moving down.

12. Packer under item 1, characterized in that the support is movable sleeve in the plashkoderzhatelya is cylindrical with an external groove or a groove for the shear screws.

3. Packer under item 1, characterized in that the shear screws are designed with a collar to limit their progress down when installed in the threaded holes plashkoderzhatelya.

14. Packer under item 1, characterized in that the barrel is made of the outer groove and set the lock ring to lock plashkoderzhatelya.

15. Packer under item 1, characterized in that the barrel is made with additional inner diameter of the bore and a landing surface for the installation of the removable hollow tube, sealed radial decoupler channels stem from its cavity.

16. Packer under item 1, characterized in that zakalivayuschie device installed above and below the sealing element.

17. Packer under item 16, characterized in that zakalivayuschie device above the sealing elements are in the form of an anchor, acting as internal and external pressure of the barrel.

18. Packer in claim 1, characterized in that the die saarialho device implemented with immediate, or acute, or obtuse angle one-way or two-way direction of their teeth, and their hardness is greater than or equal to the hardness of production casing descent packer to prevent its movement as down and up.