RU2739813C1 - Hydro inflatable packer - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for rapid disconnection of well shaft during repair and preventive works in well. Packer includes a shaft with cushioning on it elastic collar element lowered into a casing string. This element is made with an air inflatable cavity. It is fixed on the shaft with the help of upper and lower stops covering ends of the sealing element. Above upper stop concentrically arranged on barrel housing is installed. Housing is fixed by split ring from shift upwards. There is a filter forming a cavity with the housing for pure hydraulic fluid supplied through the filter from above-packer space of the well. In housing there installed is electrically driven pump for injection of pure hydraulic liquid into hydraulically inflated cavity through radial channel equipped with check valve, and a longitudinal channel provided with a check valve through a cavity made in the housing, with a sensor for measuring pressure in the pressurizing cavity. There is a controlled discharge valve for releasing excess fluid pressure from the hydraulically inflated cavity through the second longitudinal and radial channels. On top of the filter there is a measuring module with a liquid pressure sensor in the above-packer space. Under the lower stop there installed is the second housing fixed by the collar on the shaft from the downward displacement, equipped with the second measuring module with the liquid pressure sensor in the below-packer space of the well. In this space there is a second controlled drain valve for releasing excess fluid pressure from the hydraulic inflatable cavity into the sub-packer space through the longitudinal channel made at the bottom of the sealing element and in the lower support, and a radial channel communicating the drain valve with the pressurized cavity. Longitudinal channels are additionally equipped with branch pipes tightly connecting the sealing element with stops. Electric drives of the pump and controlled discharge valves and measuring modules are connected to the control station of electric cable, for its conducting on the shaft there is a longitudinal groove. Pump and bleed valves can also be equipped with individual power supplies and with measuring modules are connected to control station of telemetry system.

EFFECT: improved operational characteristics and possibility of multiple use of packer.

1 cl, 2 dwg

Description

The invention relates to the oil industry and can be used for operative separation of the wellbore when carrying out maintenance and repair work in the well.

Known sealing element for a hydraulic inflatable packer, including an inflatable part made in the form of a hollow cylinder, with connecting metal end fittings, consisting of a nipple and a sleeve, the sleeve is mounted on the outside, and the nipple is installed inward. The inflatable part includes an inner sealing layer of oil-abrasion-resistant rubber, at least one paired power layer of intercrossing brass-plated steel wires wound at an angle of 24-26 degrees to the axis. Intermediate rubber layers are placed between the wire layers. On the wire layers at an angle of 24-26 degrees, one paired layer of cord nylon fabric is applied, on which an outer protective sealing rubber layer is applied. The coupling is made of structural alloy steel with subsequent heat treatment by quenching. On the inner surface of the coupling and the outer surface of the nipple there are annular grooves and protrusions that form a tongue-and-groove connection during assembly. (Patent RU 2686562 C1. Sealing element for a hydraulic inflatable packer and a method for its manufacture. - IPC: E21B 33/127. - 04/29/2019).

Known electromagnetic shut-off valve containing a housing, inlet and outlet pipes, a saddle, a core, an electromagnet armature, a piston, a shut-off element, a spring and a rod. The piston is located in the housing. The shut-off element is located in the piston. One end of the rod is connected to the shut-off member, and the other end is connected to the armature of the electromagnet. The specified anchor has the ability to move axially. The core and the armature of the electromagnet are installed in the guide cylinder. A pneumatic brake chamber is formed between the core and the armature. An axial hole is made in the armature, inside of which there is a jet with a throttle channel, a ball and a spring. A throttle hole is made in the piston, connecting the cavity of the inlet pipe and the internal cavity of the piston. (Patent RU 2477408 C2. Electromagnetic shut-off valve. - IPC: F16K 31/02. - 03/10/2013).

Known inflatable hydraulic packer containing a hollow bore and a sealing element, concentrically mounted on it and forms with it the main hydraulic cavity. It consists of outer and inner elastic layers with a power cord located between them and end supports, a movable inner piston and a hydraulic cavity. The housing is concentrically placed on the barrel. The body and the sealing element are fixed to the barrel by means of a support and a nut. Longitudinal channels are made in the support. The movable inner piston and the outer piston are installed between the hollow barrel and the body and form with them and the inner liner hydraulic cavities, upper, middle and lower. Radial channels are made on the shaft in the upper and lower hydraulic cavities. (Patent RU 2128279 C1. Inflatable hydraulic packer. - IPC: Е21В 33/12. - 03/27/1999).

Known inflatable hydraulic packer containing a housing, fixed thereon a sealing element of the type of elastically expanding sleeve, coaxially located in the housing hollow barrel and the main piston. They form a hydraulic pressure chamber. An external piston is installed between the body and the barrel above the main piston. It forms an additional cavity with the main piston. This cavity communicates with the in-pipe space through radial holes in the bore. The barrel has the ability to move axially relative to the body and the sealing element. There is a collar on the barrel to abut against the main piston. A spring is concentrically installed on the barrel, abutting against the body. The delivery chamber is filled with clean hydraulic fluid when the packer is being assembled. The additional cavity is filled with the working mixture of the well. (Patent RU 2155857 C1. Inflatable hydraulic packer. - IPC: Е21В 33/12. - 09/10/2000).

Known inflatable reusable packer containing a barrel: at least one sleeve sleeve with a sealing element, mounted on the barrel and secured at both ends with end conical caps that prevent the sealing element from being squeezed out and reinforcing steel plates from the recesses located at both ends of the sleeve sleeve: the bottom cover, fixed on the barrel and securing the collar against axial movements; an upper cover secured to the barrel by connecting to the cuff and capable of moving along the axis along the barrel; a sealing element fixed to the cuff at both ends and reinforced with two layers of steel plates arranged in a staggered pattern, fixed at both ends of the cuff sleeve in recesses and covering the entire perimeter of the reinforcement layer; a working annular cavity located between the barrel and the cuff sealing element; a channel allowing the supply of a working fluid under pressure to the working cavity; seals sealing the working cavity. (Patent RU 167386 U1. Reusable inflatable packer. - IPC: Е21В 33/12. - 01/10/2017). This technical solution was taken as a prototype.

The main disadvantage of the known inflatable packer, taken as a prototype, is the low reliability of isolation of the production well.

The main objective of the proposed technical solution is to improve the operational capabilities of the packer.

The technical result is an improvement in operational capabilities and multiple use of the packer.

The specified technical result is achieved by the fact that, in the known hydraulic inflatable packer, containing a borehole lowered into the casing with a coaxially mounted elastic sealing element made with a hydronic cavity, fixed by the ends with the help of stops covering them, excluding axial displacement of the sealing element using a split ring and a collar on the barrel, while the upper stop is made with a longitudinal channel for pumping liquid into the hydraulic-inflating cavity of the sealing element, according to the proposed technical solution,

above the upper stop there is a housing concentrically placed on the borehole, fixed by a split ring, and a filter that forms a cavity with the housing for clean hydraulic fluid coming from the well above the packer space, a measuring module is installed on top of the filter, and an electric drive pump is installed in the housing for pumping clean hydraulic fluid into the hydronic cavity through the previously specified longitudinal channel equipped with a check valve, and a radial channel equipped with a check valve is made, which communicates the pump with a cavity for clean hydraulic fluid, and a cavity in which a sensor for measuring fluid pressure in the hydraulic cavity is installed, and a controlled drain valve for equalizing the pressure in the hydronic cavity and above the packer space of the well through the second radial and longitudinal channels, and under the lower stop there is a second housing concentrically placed on the borehole with an emphasis on the collar on the borehole in which the second control th drain valve and a radial channel is made, and a longitudinal channel is made at the bottom of the sealing element and in the lower stop, communicating the drain valve with the hydraulic inflating cavity and the wellbore space, and all longitudinal channels are additionally equipped with branch pipes that tightly connect the sealing element with the stops, while the electric drives the pump and controlled drain valves with measuring modules are connected to the control station with an electric cable, for wiring the latter, a longitudinal groove is made on the barrel;

the pump and drain valves are equipped with individual power supplies and are connected with measuring modules to the telemechanical system control station.

The analysis of the prior art given by the applicant made it possible to establish that there are no analogues characterized by sets of features that are identical to all features of the claimed hydraulic inflatable packer. Consequently, the claimed technical solution meets the "novelty" condition of patentability.

The search results for known solutions in this field of technology in order to identify features that match the distinctive features of the prototype features of the proposed technical solution, showed that they do not follow explicitly from the prior art. The prior art determined by the applicant has not revealed the influence of the transformations envisaged by the essential features of the proposed technical solution on the achievement of the specified technical result. Consequently, the claimed technical solution meets the requirement of patentability "inventive step".

The claimed hydraulic inflatable packer can be effectively used in oil producing wells during maintenance and repair work. Therefore, the claimed technical solution meets the condition of patentability "industrial applicability".

FIG. 1 schematically shows the proposed hydraulic inflatable packer with an electric control cable; in fig. 2 - the same, with the telemechanical system.

The inflatable packer contains borehole 2, which is lowered into the casing 1, with a coaxially mounted elastic sealing element 3, made with an outer diameter smaller than the inner diameter of the casing 1, forming a radial gap 8 between them for free running and lifting of the packer in the casing 1. Sealing element 3 is made with a hydronic cavity 4, and is fixed on the barrel 2 by means of the upper stop 5 and the lower stop 6, covering the ends of the sealing element 3. (Fig. 1). Above the upper stop 5 there is a housing 7 concentrically placed on the barrel 2, fixed by a split ring 8 from the upward displacement of the sealing element 3 with the upper stop 5, and a filter 9, which forms a cavity 10 with the housing 7 for clean hydraulic fluid flowing through the filter 9 from the space above the packer 11 wells. An electric drive pump 12 is installed in the housing 7 for pumping clean hydraulic fluid from the cavity 10 into the hydronic cavity 4 of the sealing element 3 through the radial channel 13, equipped with a check valve 14, and the cavity 15, made in the housing 7, and the longitudinal channel 16, equipped with a check valve 17 , and a controllable drain valve 18 for bleeding the excess fluid pressure from the hydraulic inflating cavity 4 of the sealing element 3 into the cavity 10 through the second longitudinal channel 19 and the radial channel 20 when equalizing the pressure in the hydronic cavity 4 and the overpacker space 11 of the well. In the cavity 15, a sensor is installed for measuring the pressure of the liquid in the hydronic cavity 4 of the sealing element 3 (conventionally not shown). Above the filter 8 there is a measuring module 21 with a fluid pressure sensor in the above-packer space 11 of the well. Under the lower stop 6, there is a second housing 22 concentrically placed on the borehole 2, fixed with a shoulder 23 on the borehole 2 from the downward displacement of the sealing element 3 with the lower stop 6, equipped with a second measuring module 24, in which a fluid pressure sensor is installed in the under-packer space 25 of the well, and the second controlled drain valve 26 for bleeding the excess fluid pressure from the hydraulic inflating cavity 4 of the sealing element 3 into the sub-packer space 25 through the longitudinal channel 27, made at the bottom of the sealing element 3 and in the lower stop 6, and the radial channel 28, made in the housing 22, communicating the drain valve 26 with a hydraulic inflating cavity 4 of the sealing element 3 and the under-packer space 25. The longitudinal channels 16, 19 and 27 are additionally equipped with branch pipes that tightly connect the sealing element 3 with the stops 5 and 6. The electric drives of the pump 12 and controlled drain valves 18 and 26 with the measuring modules 21 and 24 linked to the ground hundred control of the electric cable 29, for the wiring of which a longitudinal slot 30 is made on the borehole 2. The pump 12 and drain valves 18 and 26 can also be provided with individual power supplies and are connected with the measuring modules 21 and 24 to the ground control station of the telemechanical system. (Fig. 2).

Inflatable packer works as follows.

Before lowering the hydraulic inflator packer, the controlled bleed valves 18 and 26 are closed, and the check valve 17 of the pump 12 is blocked, while the inflatable cavity 4 is in a compressed state with an outer diameter smaller than the inner diameter of the casing string 1, under the action of the elastic forces of the sealing element 3, forming with the inner wall of the casing 1, the radial clearance ε for free running of the packer into the well, then the hydraulic inflatable packer is run into the casing 1 of the well. After running the packer to a certain depth, filled with wellbore fluid, at least at a level above the set of the packer, the wellbore fluid through the filter 9 fills the cavity 10 with clean hydraulic fluid. After filling the cavity 10 from the ground control station via the cable 29, the pump 12 is turned on, with the help of which, through the check valve 17 and the longitudinal channel 16 from the cavity 10 through the radial channel 13 with the check valve 14 into the hydronic cavity 4, clean hydraulic fluid is pumped, which, as it increases pressure in the hydraulic inflating cavity 4 inflates the elastic sealing element 3 until the gap ε between the sealing element 3 and the inner wall of the casing 1 is completely eliminated and its outer layer fits snugly against the inner wall of the casing 1 under the control of fluid pressure sensors in the cavity 15 and measuring modules 21 and 24. Due to the excess pressure in the hydronic cavity 4, a hermetic separation of the sub-packer cavity 25 from the above-packer cavity 11 of the well is achieved. In this case, the pressing forces of the sealing element 3 are the higher, the higher the excess fluid pressure in the hydronic cavity 4 relative to the fluid pressure in the above-packer 11 and below-packer 25 annular spaces, which allows the hydraulic-inflated packer to maintain the tightness of the well isolation. In order for the packer to be constantly in working condition and to ensure the tightness of the well isolation, it is necessary to maintain the excess pressure in the hydraulic inflating cavity 4 of the sealing element 3 at a certain level relative to the fluid pressure in the above-packer 11 and below-packer 25 annular spaces throughout the entire downhole operation under the control of pressure sensors in cavities 15 and measuring modules 21 and 24. After downhole operation, excess fluid pressure in the hydronic cavity 4 of the sealing element 3 is released by opening the drain valves 18 and 26 along the cable 29 to equalize the pressure of the liquids in the above-packer 11 and below-packer 25 spaces. In this case, the sealing element 3 by its elastic properties is compressed until the formation of a gap ε between the sealing element 3 and the inner wall of the casing 1, with which the packer in the transport state is returned to the surface. After lifting the packer, it is revised and, if necessary, the sealing element 3 is replaced. The pump 12 and drain valves 18 and 26, equipped with power supplies, can also be controlled by a telemechanical system from a ground control station.

The use of the proposed hydraulic inflatable packer improves the operational capabilities of the packer and its multiple use.

Claims (2)

1. Hydro-inflatable packer, containing a borehole lowered into the casing with a coaxially installed elastic sealing element made with a hydronic cavity, fixed by the ends with the help of stops covering them, excluding axial displacement of the sealing element using a split ring and a collar on the borehole, while the upper the stop is made with a longitudinal channel for injecting liquid into the hydraulic-inflating cavity of the sealing element, characterized in that above the upper stop there is a housing concentrically placed on the borehole, fixed by a split ring, and a filter that forms a cavity with the housing for clean hydraulic fluid coming from the overpacker space of the well, moreover, a measuring module is installed on top of the filter, and an electric drive pump is installed in the housing for pumping clean hydraulic fluid into the hydronic cavity through the previously specified longitudinal channel, equipped with a check valve, and a radial channel is provided, equipped with a non-return valve communicating the pump with a cavity for a clean hydraulic fluid, and a cavity in which a sensor for measuring the pressure of a liquid in a hydronic cavity is installed, and a controlled drain valve to equalize the pressure in the hydronic cavity and above the packer space of the well through the second radial and longitudinal channels, and under the lower stop is a second housing concentrically placed on the bore with an emphasis on the shoulder on the bore, in which a second controllable drain valve is installed and a radial channel is made, and a longitudinal channel is made at the bottom of the sealing element and in the lower stop, communicating the drain valve with the hydronic cavity and the under-packer space of the well , moreover, all longitudinal channels are additionally equipped with branch pipes that tightly connect the sealing element with the stops, while the electric drives of the pump and controlled drain valves with measuring modules are connected to the control station with an electric cable for wiring the latter on the barrel a longitudinal groove is made. 2. Packer according to claim 1, characterized in that the pump and drain valves are provided with individual power supplies and are connected with measuring modules to the telemechanical system control station.

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