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Two-packer device

IPC classes for russian patent Two-packer device (RU 2249669):

E21B33/12 - Packers; Plugs (used for cementing E21B0033134000, E21B0033160000)

Another patents in same IPC classes:

Device for isolation operations in wells / 2249094
Device has body with radial apertures, two compacting assemblies thereon and valve assembly between them. Each compacting assembly comprises a collar, stopping branch pipe, cylinder, forming a ring-shaped hollow with the body, wherein a bushing is placed. In upper compacting assembly ring-shaped hollow is covered by plug from lower side, which is fixed in cylinder and interacts with collar, cylinder is connected to body by cams, placed in radial apertures of plug and in ring groove of body, bushing is made stepped, long step of which interacts with cams and is fixed by shear screws from displacement in ring plane, which is connected to well. In lower compacting assembly bushing is provided with holder, on the body a cone is mounted, interacting with sockets, placed in grooves of stopping branch pipe, which is fixed on the body by shear screws.

Device for isolating inter-tubular space in the well / 2247223
Device includes hollow body with a row of vertical apertures, a collar, pusher bushing, placed on body with possible interaction with collar, cone, mounted on the body, cylinder, connected to cone, screw-thread dies with die holder, mounted on the body with possible extension of dies in radial direction during interaction with cone, saddle and shear screws. According to invention in die holder additional through radial apertures are made, wherein sockets are mounted with possible extension in radial direction. Inner hollow of die holder is connected to inner hollow of body by a row of radial apertures. In pusher bushing through radial apertures are made, wherein sockets are mounted with possible extension in radial direction. Pusher bushing is rigidly fixed to the body, and its inner hollow is connected to inter-tubular space below the collar.

Packer testing stand / 2247222
Stand has imitators of casing and lifting columns with packer between them, means for heating casing column imitator, main hydraulic cylinder for axial loading and unloading of packer, pumps to create pressure. Stand is provided with additional hydraulic cylinder with hollow rod and cylinder, connected to rod of min hydraulic cylinder. Additional hydraulic cylinder is encased in the body, rigidly connected to main hydraulic cylinder and imitator of casing column. In additional hydraulic cylinder a ring-shaped piston is placed with conical skirt, interacting with keys with possible periodical supporting against the body through windows in said cylinder and below keys spring-loaded ring-shaped pusher is moveably mounted. In hollow of imitator of lifting column a floating piston is positioned, this hollow and hollow of the hollow rod are interconnected and also connected to hollow above ring-shaped piston.

Mechanical packer system / 2246604
System has upper and lower packers, each of which has body, shaft, anchor, compactors, and pipes, placed between packers. In shaft of upper packer a copier is made with fixing device of transporting and working position of anchor and a sub. The latter is mounted with possible axial displacement and rotation around the copier. Sub is placed on pipes between packers, mated to lower packer and has no capability for axial rotation and displacement relatively to their axis in operating position of lower packer. On lower packer shaft a copier is made with possible axial displacement with it for interaction with anchor and its displacement from transporting position to operation position.

Packer / 2245986
Packer has body in form of pipe, whereon collar compactors are placed with limiting washers, saddles for locking tool dropped from surface, cover, upper and lower fixing elements, made in form of anchoring assemblies, upper conical bushing, rigidly connected to pressing bushing and movably to the body, lower conic bushing, made rigidly together with body, guide of this conic bushing made in form of plate spring, placed by one end moveably in guiding groove in lower portion of lower die with teeth, and by other end fixed rigidly on greater diameter of this conic bushing, auxiliary pipe, placed inside the body. Packer in lower portion is provided with check valve, placed inside recess of body, concurrently being also the body of valve. Oppositely to valve saddle on same axis stepped locking bushing is placed with possible sliding inside body recess with limited drive and possible overlapping of radial grooves made in body, which, in its turn, is rigidly connected to auxiliary pipe via shear pin. Between stepped locking bushing and saddle compression spring is placed. Fixing elements of collar compactors are made in form of comb with inner teeth and outer conic generators in nose portion. On the side of collar compactors these are enveloped by inner conic portion of compression bushing, in its turn rigidly connected to upper conic bushing, and on the other side combs with inner teeth are placed sliding-moveably in radial grooves of guiding bushing placed between ends of upper conic bushing and inner conic portion of compression bushing with possible engagement by inner teeth of comb to slanting walls of body groove and interaction to all elements of this assembly.

Two-packer device / 2249669
Device has shaft with radial channels and return valve, upper and lower compacting elements. Inside the shaft a hollow spring-loaded moving rod is placed. It has radial apertures and recesses. Between apertures a throttle is rigidly placed. On upper portion of rod a piston is placed. Working hollow, formed between rod with piston and barrel, fixed on inner portion of shaft, is connected to above-packer space of well by radial aperture, made in barrel wall. Working hollows of upper and lower compacting elements are connected by axial channel, made in shaft and ring channel, formed between inner and outer pipes, connecting lower compacting element to the shaft. On upper portion of pipe through radial apertures are made and cylindrical recess, matching rod diameter, in which rod a plug is place. Outer diameter of upper end portion of rod equals outer diameter of lower rod portion.

Self-detaching bidirectional action packer with electromechanical drive / 2250351
Packer has body, in which electric engine, reducer with output shaft, connected to screw couple, which is connected to traction, having holding rods on lower portion with spring for transfer of axial force to central rod, having a shelf in upper portion as well as recess and cuts, and in inner portion - compacting rings and stopping nut, are positioned. Packer has shell, having conical surface on inner portion, special part with shelves, shear ring placed in grooves of said special part and holding segments, immobile bushing connected fixedly to special part. Packer has packer rubber, saddle, rigidly connected to special part, moveable flange and two cones, placed oppositely to each other, dies, moveably placed on cones, traction, jointly connected to dies, branch pipe, fixedly placed on body, moveable bushing, balls, pressed by spring and screw for connection of special part to shell, cable of rope, being a carrying cable and feeding electric engine via filament, shear washer, pressed by nut. When packer is removed, engaging assembly is utilized, which includes pusher, screwed on lower portion of screw couple screw, cut holder and cover. Through apertures are made on special part and moveable flange for connection of above-packer and below-packer well hollows.

Packer / 2251614
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.

Packing device of additional casing column / 2254441
Device has body, made in form of branch pipe with elastic collar mounted on it, expanding assembly with cone, shear element, gear, lowered on pipes column into additional casing column and interacting with expanding assembly from above. Expanding element is positioned in upper portion of branch pipe and locked with its cone directed downwards, gear is made in form of pusher in lower portion and anchor assembly in upper portion. Pusher is made in form of hydraulic cylinder, made with possible pressure from above on expanding assembly and provided with piston and hollow rod, which is connected to piston rigidly, and to pipes column - hermetically with possible upward axial displacement. Anchor assembly is made in form of dies, mounted on hollow rod with possible radial movement outwards during movement of hollow rod upwards relatively to pipes column. Shear element holds hollow rod relatively to pipes column during lowering into well.

Packing device of additional casing column / 2254442
Device has packer, mounting tool and anchor assembly. Packer expander is mounted in upper portion of body, and anchor assembly - above hydraulic chamber of mounting tool. Hydraulic chamber cylinder is mounted with possible displacement relatively to rod and hydraulically connected to inner space of device. Body of anchor assembly is provided with sockets, in which spring-loaded dies are mounted, which are activated by hydraulic effect formed in tubing pipes column, on which device is lowered into well.

FIELD: oil and gas industry.

SUBSTANCE: device has shaft with radial channels and return valve, upper and lower compacting elements. Inside the shaft a hollow spring-loaded moving rod is placed. It has radial apertures and recesses. Between apertures a throttle is rigidly placed. On upper portion of rod a piston is placed. Working hollow, formed between rod with piston and barrel, fixed on inner portion of shaft, is connected to above-packer space of well by radial aperture, made in barrel wall. Working hollows of upper and lower compacting elements are connected by axial channel, made in shaft and ring channel, formed between inner and outer pipes, connecting lower compacting element to the shaft. On upper portion of pipe through radial apertures are made and cylindrical recess, matching rod diameter, in which rod a plug is place. Outer diameter of upper end portion of rod equals outer diameter of lower rod portion.

EFFECT: higher reliability.

2 dwg

The invention relates to the oil and gas industry, namely patrolsim devices interval for injection into reservoirs wells insulating materials, acid reagents during periods of drilling, exploration and exploitation of the well.

A device for injection of reagents into the well (A.S. USSR №1714080, MKI E 21 33/12, publ. BI No. 7 23.02.92, similar), including a barrel with an axial channel and the radial holes, spring-loaded telescopically mounted on the shaft differential bushing with radial holes, rigidly connected with the lower part of the trunk and plugged the bottom of the housing with radial holes and tabs on the end sections telescopically mounted on the upper ledge of the housing is stepped sleeve, the sealing element is fixed to the upper end section of a stepped sleeve, bushing-plunger interacting with differential bushing, stepped bushing-thrust with Windows, in which is placed the spring to the housing slips.

The disadvantage of this device is that it is applicable only for the separate injection of reagents into the upper reservoir of the well and does not allow to separately treat the underlying layers and to perform well wash to clean it from sludge and deposits on its walls over the entire length of the device to provide a hermetically the year petrovanu.

Also known packer (A.S. USSR №1788209, MKI E 21 In 33/12. Publ. BI No. 2 15.01.93,, similar), including a hollow barrel with a saddle on the bottom under the bargain locking element, the radial channels and the upper and lower longitudinal grooves on the outer surface, mounted on the barrel of the sealing element with the upper end of the valve, forming a barrel with a ring cavity, and the lower end of the valve that is installed with the possibility of longitudinal movement relative to the stem, an annular spring-loaded plunger mounted in the annular cavity between the shaft and the upper end of the armature, newportnews space of which is connected through radial channels with the cavity of the trunk, and podpisniye through the upper longitudinal grooves of the barrel with the working chamber sealing item is made with the possibility of a message when Petrovka through the upper longitudinal grooves, newportnews space and radial channels of the trunk with the cavity of the trunk, and when respitrace through the lower longitudinal grooves with the space below the sealing element and the latch of the trunk relative to the upper end of the valve sealing element, spring anchor, mounted on the outer surface of the upper end of the valve sealing element, additional lower sealing element forming with the barrel chamber, the hydraulic the ski associated with the cavity of the trunk.

The disadvantage of this packer is that it is applicable to install it in a cased wellbore during its development and operation, and its use in uncased wellbore may lead either to hang the packer during its descent in the well or spring break anchor, or to the failure of the packer in the operations to bring it to its original position due to the presence in the uncased wellbore local curvatures and caverns. Also, this is not the packer allows flushing of the well to clean it from sludge and deposits on its walls over the entire length of the packer, if you need to spend without raising the packer to the surface, the injection of the reagent into the reservoir, located on the interval of the well below the original installation interval packer, and mnogoplemennosti this packer complicates its design and reduces the reliability of his work.

Closest to the invention to the technical essence and the achieved result is a packer (A.S. USSR №2010947, MKI E 21 In 33/12. Publ. BI No. 7 15.04.94 (prototype), including a hollow barrel with a plug on the bottom, the radial channels and the upper and lower longitudinal grooves on the outer surface mounted on the barrel and forming with it the working chamber of the sealing element with the upper end of the valve, forming a trunk to litsevoy cavity, and lower end fittings installed with the possibility of longitudinal movement relative to the stem, a lock barrel relative to the upper end of the valve ring and a spring-loaded plunger mounted in the annular cavity between the shaft and the upper end of the valve with a message when Petrovka working chamber of the sealing element with a hollow stem mounted for axial movement relative to the sealing element when it is respitrace, and messages of the working chamber of the sealing element with the cavity of the barrel and the space below the packer, spring anchor, mounted on the outer surface of the upper end of the valve sealing element, spring-loaded differential bushing installed in the cavity of the barrel and having an annular groove on the outer surface, the fingers pins and spring lock barrel.

The disadvantage of this packer is that it is applicable to install it in a cased wellbore during its development and operation, and its use in uncased wellbore may lead either to hang the packer during its descent in the well or spring break anchor, or to the failure of the packer in the operations to bring it to its original position due to the presence in the uncased wellbore with the vazhiny caverns and local curvatures. Also, this is not the packer allows flushing of the well to clean it from sludge and deposits on its walls over the entire length of the packer to ensure a tight petrovanu and mnogoplemennosti this packer complicates its design and reduces the reliability of his work.

The purpose of the invention is the improvement of reliability of two-packer device and simplifying the design.

This goal is achieved by the fact that in two-packer device comprising a shaft with radial channels and non-return valve, the upper sealing element mounted on the barrel and forming with them a working chamber, the lower sealing element rigidly associated with the shaft through the outer tube, the inside of the barrel is placed a hollow spring-loaded movable rod having radial holes and grooves, in which the bores for the supply of the working fluid in the working cavity of the sealing elements and the reservoir is fixed throttle, and on the upper part of the rod fixed to the piston, while the working cavity formed between the piston rod with the piston and Cup, attached to the upper part of the trunk, connected with nadakarni space well a radial hole made in the wall of the glass and the working cavities of the upper and lower sealing elements axially of the passage in the barrel and kalawy the channel, formed between the inner and outer pipes connecting the lower sealing element with the barrel, and on the upper part of the inner tube is made through the radial holes and the cylindrical recess corresponding to the diameter of the rod, which has a cap, and the outer diameter of the upper end portion of the rod is equal to the outer diameter of the lower part of the stem.

Patent studies have shown that the proposed solution has novelty, industrial applicability and inventive step. New in the proposed two-packer device is that the inside of the barrel is placed a hollow spring-loaded movable rod having radial holes and grooves, in which the bores for the supply of the working fluid in the working cavity of the sealing elements and the reservoir is fixed throttle, and on the upper part of the rod fixed to the piston, while the working cavity formed between the piston rod with the piston and the glass is attached to the upper part of the trunk, connected with nadakarni space well a radial hole made in the wall of the glass and the working cavities of the upper and lower sealing elements axially of the passage in the barrel, and the annular channel formed between the inner and outer pipes connecting the bottom o e is ement with the barrel, moreover, on the upper part of the inner tube is made through the radial holes and the cylindrical recess corresponding to the diameter of the rod, which has a cap, and the outer diameter of the upper end portion of the rod is equal to the outer diameter of the lower part of the stem.

The set of essential features that characterize the proposed two-packer device which will eliminate the disadvantages inherent in the prototype, and, thus, increase reliability and simplify the design of the device.

The invention is illustrated by drawings, where:

1 shows a General view of the proposed two-packer device in the initial position during tripping operations.

Figure 2 shows the proposed two-packer device in the working position, after installation in the well.

Two-packer device (Fig 1 and 2) consists of a hollow rod 1, spring spring 2, which is rigidly fixed to the throttle 3 and the piston 4, shaft 5, to which is rigidly attached to the upper sealing element 6, the Cup 7, the check valve 8, the inner tube 9 and the outer tube 10 to which is rigidly attached to the lower sealing element 11. On top of the device has top sub 12. On the rod 1 has a hole 13 for feeding the working fluid into the formation, the hole 14 for feeding the working fluid into the slave is Chiyo cavity 15 and 16 top 6 and the bottom 11 of the sealing elements, a groove 17 for discharging working fluid from the working cavity of the sealing elements, and the o rings 18, 19, 20, 21, 22, 23, 24. Working cavities 15 and 16 of the upper and lower sealing elements are sealed with o-rings 26 and 27. On the shaft 5 is made a hole 28 for discharge of the working fluid in the formation, the hole 29 for discharging working fluid from the working cavity of the sealing elements and the axial channel 30 connecting the working cavities 15 and 16 of the upper and lower sealing elements. Between the rod 1 with the piston 4 and the glass 7 is formed by the working cavity 31 connected with nadakarni space of the bore hole 32, is made in the wall of the Cup. Between the inner 9 and outer 10 tubes formed annular channel 33. On the upper part of the inner pipe 9 is made of radial holes 34 to effect the washing cylindrical recess 35, corresponding to the diameter of the rod 1, and tightly plugged 36. Stroke down 1 limited performed on the ledge 37.

Two-packer device operates as follows. Two-packer device is lowered into the well on tubing and placed in the specified interval of the wellbore. In the process of lowering of the elements of the device are in the position shown in figure 1. When the rod 1 is drawn in the upper sub 12 us who Liem preliminary compression spring 2, the radial holes 13, 14, 28 and check valve 8 closed, the holes 34 in the inner tube are open and working cavities 15 and 16 of the upper 6 and lower sealing elements 11 through the opening 29 in the barrel, the groove 17 on the rod and the hole 32 in the Cup communicated with nadakarni space well. In the process of lowering the device into the well the internal cavity of the device and the tubing is filled with fluid from the well through the inner tube 9, the holes 34 and the orifice 3. Before spacerowa devices produce flushing and cleaning of the well from cuttings. To do this, include the pump at the specified performance, the fluid flow will pass through the Central channel in the rod, throttle 3, the holes 34 and the inner tube 9 will flow into the well by flushing and cleaning it from cuttings, while the rod 1 will be a force arising from the pressure difference of the working fluid on the throttle 3, the lack of the specified rate of drilling fluid to overcome the efforts of the pre-compression of the spring 2. When washing the wells Pets any hydraulic resistance of the wells in the setup of two-packer device, as this stock will remain stationary and, therefore, will not be sapacitabine device, because the outer diameter of the upper end of the second part of the rod is equal to the outer diameter of the lower part of the stem.

After washing the wells start injecting reagent into the reservoir. To do this, increase the capacity of the pump to a predetermined value. Thus by increasing the differential pressure of the working fluid at the orifice 3 of the rod 1 will operate the hydraulic axial force exceeding the force of the compression spring 2, the shaft 1 will move down until it touches the ledge 37 with the upper end of the stem 5, resulting in the end part of the rod 1 will be released from the upper sub 12, the outer surface of the piston 4 is sealed by the inner surface of the Cup 7, the sealing ring 23 on the rod will enter the barrel, the holes 14 and 13 on the rod in alignment respectively with the inner bore of the check valve 8 and the discharge holes 28, and the lower end of the rod 1 will be included in the recess 35, is made on the upper end of the inner tube 9 (see figure 2). In the result, the working fluid in the internal cavity of the rod through the holes 14 and the check valve 8 is introduced into the working cavity 15 of the upper sealing element 6 and then through the axial channel 30 in the barrel and the annular channel 33 between the inner 9 and outer 10 tubes into the working cavity 16 of the lower sealing element 11, filling them to spacerace device, and through the orifice 3 and the hole 28 is introduced into the reservoir. When the fluid pressure in the working cavity of the seal is a separate estimate will be more fluid pressure in the reservoir on the value of the differential of fluid pressure on the throttle, that provides reliable Petrovna.

As the working cavity 31 formed between the shaft 1 with the piston 4 and the inner surface of the Cup 7 is provided with nadakarni space of the well during injection of the reagent into the reservoir on the rod will act in addition to the axial force arising from the pressure differential of the liquid at the orifice, the axial force arising from the pressure difference between the fluid inside the tubing and nagakura space well. Therefore, when the pump stops, this two-packer device will remain spacerunner, as the rod will remain in the lowest position, and the working fluid within the working cavities 15 and 16 of the sealing elements 6 and 11 will remain under pressure through the check valve 8. After the injection of the reagent into the reservoir to produce raspaculo device. For this purpose, the pressure inside the tubing is reduced to zero by opening the valve in the pressure line, by the spring 2, the shaft 1 will return to its original position shown in figure 1, the working fluid from the working cavities 15 and 16 of the upper and lower sealing elements poisoned through the hole 29 in the barrel, the groove 17 on the rod and the hole 32 in the glass in nadakarni space well and will respecrive device.

Technical advantages and is gaining in comparison with the prototype are a simpler design and higher reliability of the device in an uncased wellbore, as in the inventive device it is possible to wash well to clean it from sludge and deposits on its walls over the entire length of the packer to ensure a tight petrovanu and there is no spring-loaded anchor.

Two-packer device comprising a shaft with radial channels and non-return valve, the upper sealing element mounted on the barrel and forming with them a working chamber, the lower sealing element rigidly associated with the shaft through the outer tube, wherein the inside of the barrel is placed a hollow spring-loaded movable rod having radial holes and grooves, in which the bores for the supply of the working fluid in the working cavity of the sealing elements and the reservoir is fixed throttle, and on the upper part of the rod fixed to the piston, while the working cavity formed between the piston rod with the piston and the Cup is attached to the top part of the trunk, connected with nadakarni space well a radial hole made in the wall of the glass and the working cavities of the upper and lower sealing elements axially of the passage in the barrel, and an annular channel formed between the inner and outer pipes connecting the lower sealing element with the barrel, and on the upper part of the internal is her tube is made through the radial holes and the cylindrical bore, corresponding to the diameter of the rod, which has a cap, and the outer diameter of the upper end portion of the rod is equal to the outer diameter of the lower part of the stem.