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Device for isolation operations in wells. RU patent 2249094.

IPC classes for russian patent Device for isolation operations in wells. RU patent 2249094. (RU 2249094):

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

Another patents in same IPC classes:

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.

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.

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 industry.

SUBSTANCE: 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.

EFFECT: higher reliability.

2 cl, 4 dwg

The invention relates to the field of oil and gas industry, namely, devices for insulation work in wells, including selective injection of insulating materials in the elimination of cross-flows, shutoff, recovery of casing tightness, and spacerace casing packer installed on perforated casing, the completion, including razvetvlenno horizontal multilateral wells.

A device that includes a housing and placed it two sealing unit and the valve unit between them [1].

The disadvantage of this device lies in the complex design of each sealing unit and relatively low reliability.

Closest to the invention is a device comprising a body placed in it two sealing unit and the valve unit between them, each of the sealing units contains the cuff, the thrust nozzle, a cylinder forming with the casing an annular cavity in which is placed the nut [2].

The disadvantage of this device is that even when short-term excess pressure in the housing sealing units repatriate and insulation (cement) mortar in the horizontal well will flow through the annular space to the left and to the right from the device, and therefore, there is a strong likelihood that the column pipe 26 is attached to the hardened insulation (cement) mortar.

The pressure in the string of pipe 26 cannot be ruled out in the injection process, the insulating solution into the well bore due to unforeseen accidents at the well (gust in threaded connection hydroblast from the wellhead to the cementing unit, the destruction of the valve system in the unit and so on).

The technical result of the invention is to improve reliability of the device.

Required technical result is achieved in that the device for insulation work in a well includes a housing with radial holes, posted two sealing unit and the valve unit between them, each of the sealing units contains the cuff, the thrust nozzle, a cylinder forming with the casing an annular cavity in which is placed a sleeve, according to the invention in the top o the node ring cavity is blocked from the bottom of the tube, which is fixed in the cylinder and communicates with the sleeve, the cylinder connected to the housing of Cams placed in the radial holes of the tube and the annular groove of the housing, the sleeve is made step, long step which interacts with Cams and fixed shear screws from moving in the annular cavity which is communicated with the bore, and the lower sealing the node sleeve provided with a lock, the casing has a cone interacting with slipcase placed in the grooves of the thrust nozzle, which is fixed on the casing shear screws.

The proposed device is illustrated in the drawings, figure 1 is a-4.

Figure 1 shows a General view of the device in the transport position.

Figure 2 - device for the circulation of fluid, the creation of pressure and spacerace sealing unit.

Figure 3 - the device if spacerace upper sealing unit and the injection of the insulating material in the annulus of the well under pressure.

Figure 4 - device after respitrace upper and lower sealing units for the sequential discharge of the excess pressure in the device and axial tension in the pipe string on which the device is installed in the well.

The device comprises (1) from the upper sealing unit "And"valve block "In", the lower sealing unit "With" and check valve "D", which include the composite casing 1 with radial holes 2, 3, 4, cylinder 5 with a radial hole 6, a sleeve 7, the tube 8, the cuff 9, shear screws 10, the Cams 11, the thrust nozzle 12, a spring 13, a sleeve 14 with holes 15, the coupler 16 the cylinder 17, the sleeve 18 with the latch 19, the cuff 20, the cone 21, the spring 22, the thrust nozzle 23 with slipcase 24 and shear screws 25.

Sealing of the contact surfaces between the parts of the device is ensured by rubber o-rings, shown in figure 1-4.

The device operates as follows.

The device goes down on the string of pipe 26 in the casing 27 with radial holes 28 for injection of the insulation material in the annulus of the well. When lowering the device into the well column pipe 26 is filled with fluid from the well through the check valve "D".

The string of pipe 26 create excessive pressure in the device, in which there is spacerowa lower sealing unit "With" locking sleeve 18 in the cylinder 17, and the cut of the screws 10 and moving the sleeve 7 up to release Cam 11, the retaining tube 8 in case 1 (figure 2). With the increase of excess pressure in the valve device is opened node "" and there is a circulation of fluid from the tubing 26 to the annular space.

Excessive pressure drop and unload some of the weight of the column of pipes 26 to the device. When the cylinder 5 with the tube 8 compress the cuff 9 and spacerowa her in the casing 27 (figure 3).

After you install the device (spacerace upper and lower sealing units) on the string of pipe 26 is injected insulation solution, which via a valve node "" and the radial holes 28 of the casing 27 enters the annulus of the well to eliminate cross-flows, limiting water inflow into the borehole, restore the tightness of the casing, etc.

After the end of the insulation works well excessive pressure drop and pull the string of pipe 26 to the axial force sufficient to shear the screws 25.

This rapacuronium upper sealing unit "And", and then, after cutting screws 25, the lower sealing unit "With". Backwashing through the annular space through the valve "D" wash away the remnants of the insulating material of the annulus and the tubing 26 (figure 4). Valve design "D" must provide reliable, including horizontal wells wells.

When removing the device from the well flow of fluid from the pipe string 26 is provided through the hole 6 in the cylinder 5.

Sources of information

1. Patent No. 2010947, 1994

2. Patent No. 2095541, 1994

Device for insulation work in a well, comprising a housing with radial holes, posted two sealing unit and the valve unit between them, each of the sealing units contains the cuff, the thrust nozzle, a cylinder forming with the casing an annular cavity in which is placed a sleeve, characterized in that the upper o-node ring cavity is blocked from the bottom of the tube, which is fixed in the cylinder and communicates with the sleeve, the cylinder connected to the housing of Cams placed in the radial holes of the tube and the annular groove of the housing, the sleeve is made step, long step which cooperates with Cams and fixed shear screws from moving in the annular cavity which is communicated with the bore, and the lower sealing the node sleeve provided with a lock, the casing has a cone interacting with slipcase placed in the grooves of the thrust nozzle, which is fixed on the casing shear screws.