Packer for shutting off internal cavity of flow string

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil production, particularly to repair and operation of oil and gas wells. The packer for shutting off internal cavity of flow string consists of a case with the central channel and upper and lower stops with a sealing component fixed in between; the sealing component has one thickened and one thin-wall inserted-joint parts; the latter forms a cavity with an external wall of the case communicating with outer space of the facility; also a self-sealing collar is made on external surface of the sealing component. The central channel of the case from below is equipped with a back valve with a saddle secured in the case with a shear screw. The self-sealing collar is designed to let flow up-down, while the cavity communicates with external space via the lower stop; also from above the case is equipped with a hollow branch with a piston, outside of which there is located a cylinder with a collet below, communicated with internal cavity of the sleeve and designed to a restricted motion upwards. Internal surface of the collet is of a cone shape narrowing downward; it interacts with the piston, while external surface is equipped with lugs designed to interact with internal surface of flow string.

EFFECT: reliable operation under high pressure due to more fail-safe insulation of annular space.

1 dwg

 

The invention relates to the oil industry and can be used in the repair and operation of oil and gas wells.

The famous "Packer to overlap the inner cavity of the pipe string (patent RF №2143542 IPC EV 33/12, publ. Bull. No. 36 of 27.12.99,), comprising a housing with a Central through-channel, the upper and lower stops and sealing element. The sealing element has a thickness and a thin-walled socket part, the latter of which forms the outer wall of the body cavity, the upper and lower lugs rigidly connected with the corresponding parts of the sealing element and the housing, while the upper stop is made with holes, informing the cavity with the external device space, and a maximum outer diameter thin-walled socket part in its expansion by 1-3% larger than the inner diameter of the pipe string.

This packer has a number of significant disadvantages - low limit pressure, ensuring the tightness of the disconnected intervals, and the necessity of applying the effort at the beginning of the descent into the well. Due to the fact that the outer surface of the sealing element is smooth, when exposed to pressures in excess of 3-4 MPa (data bench testing) is hydroporus and depressurization intervals disconnection at the place of contact of the sealing element with what Tenkai casing.

Closest to the proposed packer is a "Packer to overlap the internal cavity of the pipe string," (patent No. 52911 IPC EV 33/12, publ. Bull. No. 12 of 27.04.06,), comprising a housing with a Central channel, the upper and lower limit, between which is fixed sealing element having a thickness and a thin-walled socket part, the latter of which forms the outer wall of the body cavity, with the upper stop is made with holes, informing the cavity with the external device space, and on the outer surface of the sealing element is made self-sealing cuff, leaking from the bottom up.

The disadvantages of this packer are limited use, as the application of the packer on the small depth (500 m) for studies of the well or injection fluid in the injection wells is the extrusion of the packer with the column tubing from the well, as the force that extrudes the packer exceeds the weight of the tool, and also that due to the lack of rigid fixation with increasing pressure, there is a shift of the sealing element, which leads to loss of tightness.

An object of the invention is to expand the possible applications, the increase in reliability due to the rigid fixation of the packer and better insulation of m is trubnogo space and as a consequence, an opportunity to work with great pressure.

The technical problem solved by the packer to overlap the inner cavity of the pipe string, comprising a housing with a Central channel, the upper and lower limit, between which is fixed sealing element having a thickness and a thin-walled socket part, the latter of which forms the outer wall of the body cavity, a chamber connected with the external device space, and on the outer surface of the sealing element is made self-sealing cuff.

What's new is that the Central channel of the hull bottom is equipped with a check valve seat fixed in the casing shear screw, self-sealing cuff is made with the possibility of transmission from top to bottom, and a cavity communicated with the outside space through the lower stop and the top of the casing has a hollow pipe with a piston, which is placed outside the cylinder with gripper bottom provided with an internal cavity of the socket and with a limited move up, while the inner surface of the collet is provided with a tapered constriction at the bottom and with the opportunity to interact with the piston, and the outer - fitted with the projections made with the possibility of interaction with the inner surface the pipe string.

The drawing shows the pattern of the packer in prodol the second section.

Packer to overlap the inner cavity of the pipe string includes a housing 1 with a Central channel 2, top 3 and bottom 4 stops. Between stops 3 and 4 are fixed sealing element 5 having a thickness of 6 and a thin-walled socket 7 parts, the latter of which forms the outer wall of the housing 1, the cavity 8. On the outer surface of the sealing element 5 is made self-sealing cuff 9. The Central channel 2 of the housing 1 from the bottom is equipped with a check valve 10 and a seat 11 mounted in the housing 1 shear screw 12. Self-sealing cuff 9 is arranged to pass from top to bottom. The chamber 8 is communicated with the outside space through the slots 13 in the lower extreme position 4. On top of the housing 1 is equipped with a hollow pipe 14 with the piston 15, the outside of the piston 15 is placed in the cylinder 16 with the collet 17 below. The cylinder 16 is in communication with the inner cavity of the pipe 14 of the bore 18 and is made with a limited move up. The inner surface 19 of the collet 17 is made conical, narrowing at the bottom and with the opportunity to interact with the piston 15. The outer surface 20 of the collet 17 is equipped with protrusions 21, configured to interact with the inner surface of the pipe string (not shown).

Packer works as follows.

The packer set in the composition of the composition of downhole equipment (drawing does not p is cousin), which column tubing (tubing) (not shown), the lower in the string of pipe bore (not shown) to the desired site, for example, above the perforated interval. Thin-walled socket portion 7 of the sealing element 5 protects self-sealing cuff 9 from destruction. Then in the tubing string to create a pressure drop. As below the sealing element 5 has a ball valve 10 with the seat 11, which is connected with the housing 1 shear element 12, the differential pressure acts through the radial channel 18 on the piston 15 with a hollow pipe 14 and the cylinder 16. When the cylinder 16 with split collet 17 is lifted up, and the piston 15, acting on the inside tapered surface 19 of the split collet 17, pushes her. While the outer surface 20 of the collet 17 protrusions 21 is fixed to the casing wall (not shown), securely locking the packer relative to the casing. For a more reliable fixation of the packer, the tubing string unloaded, while the piston 15 further pushes the collet 17, the protrusions 21 are embedded in the casing wall. Further, when the subsequent pressure increase is destroyed shear element 12, and the ball 10 with the saddle 11 is lowered to the bottom opening of the Central channel 2. Further, the pressure drop is created in the annulus tubing (under seal elements stored is), which, being transferred by the grooves 13 of the lower stop 4 in the cavity 8, presses the thin-walled socket portion 7, and a self-sealing cuff 9 of the sealing element 5 to the inner surface of the casing. The higher the differential pressure, the more thin-walled socket part 7 with self-sealing cuff 9 is pressed against the inner wall of the casing securely insulating the upper interval of the well from the high pressure, as a self-sealing cuff 9 eliminates the possibility of hidroponia bottom at high pressures.

Thus, when applying the packer on the small depth (500 m) for studies of the well or injection fluid in the injection wells does not occur extrusion of the packer from the well, as the anchor, made in the form of the surface of the collet with notches, is embedded in the casing wall, securely locking the packer relative to the casing string.

The proposed construction of the packer expands application possibilities, increases reliability due to the rigid fixation of the packer and better insulation of the annulus and, as a consequence, an opportunity to work with great pressure.

Packer to overlap the inner cavity of the pipe string, comprising a housing with a Central channel, the upper and lower lugs, between which is fixed sealing element having a thickness and a thin-walled socket part, the latter of which forms the outer wall of the body cavity, a chamber connected with the external device space, and on the outer surface of the sealing element is made self-sealing cuff, wherein the Central channel of the hull bottom is equipped with a check valve seat fixed in the casing shear screw, self-sealing cuff is made with the possibility of transmission from top to bottom, and a cavity communicated with the outside space through the lower stop and the top of the casing has a hollow pipe with a piston, which is placed outside the cylinder with gripper bottom provided with an internal cavity of the socket and with a limited move up, while the inner surface of the collet provided with a tapered constriction at the bottom and with the opportunity to interact with the piston, and the outer equipped with projections made with the possibility of interaction with the inner surface of the pipe string.



 

Same patents:

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FIELD: oil and gas production.

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5 dwg

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3 dwg

FIELD: oil and gas industry.

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EFFECT: higher reliability, durability and lower cost.

3 dwg

FIELD: oil industry.

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EFFECT: higher reliability.

2 cl, 4 dwg

Two-packer device // 2249669

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

FIELD: oil and gas industry.

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EFFECT: lower costs and simplified maintenance.

6 dwg

Packer // 2251614

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

FIELD: oil and gas industry.

SUBSTANCE: 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.

EFFECT: simplified construction, lower costs.

1 dwg

FIELD: mining industry.

SUBSTANCE: 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.

EFFECT: simplified construction, higher reliability, higher efficiency.

1 dwg

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