RU63855U1 - PACKING DEVICE FOR EXTRA CENSING - Google Patents

Abstract

The proposal relates to the oil and gas industry, namely, to protect casing strings from high pressure and can be used when running additional casing strings into wells, the casing strings of which have become unusable.

The packer device of the additional casing string consists of a body made in the form of a pipe, on the outer surface of which an elastic cuff is installed that expands the assembly with the cone, a mechanism lowered on the pipe string into the additional casing string and interacting from above with the expanding assembly. The expansion unit is located on top and is fixed with a cone down in the pipe. The mechanism is made in the form of a pusher having the possibility of pressure from above on the expanding unit and consisting of a hydraulic cylinder made of a through and hollow rod equipped with a number of radial channels.

The mechanism is equipped with a packer, consisting of a housing and a sleeve, as well as a sealing element installed between them, and the sleeve is placed telescopically on top of the housing with the possibility of limited axial movement and radial expansion of the sealing element outward in the working position.

The hollow rod is rigidly connected from below to a hydraulic cylinder made through, and from above to a packer. A series of radial holes are made in the pipe string above the packer, communicating the interior spaces of the pipe string and an additional casing string.

A series of radial holes made in the pipe string hermetically from the inside is covered by a movable sleeve fixed in the pipe string with a shear element. In addition, the movable sleeve on top is equipped with a ball seat.

The proposed packer device of the additional casing string has a simple design and eliminates the outflow of borehole fluid at the wellhead during the descent and lifting of the mechanism on the pipe string into the additional casing string, which does not delay the duration of tripping operations and does not contaminate the area adjacent to the well. 1 ill. for 1 liter

Description

The proposal relates to the oil and gas industry, namely, to protect casing strings from high pressure and can be used when running additional casing strings into wells, the casing strings of which have become unusable.

A packer device of an additional casing string is known (patent for utility model of the Russian Federation No. 32182, IPC 7 ЕВВ 33/12, published in Bulletin No. 25 dated 09/10/2003), comprising a housing made in the form of a pipe with an elastic sleeve installed on it expanding the node, including the cone, and a shear element, while the body is a deformable element and is provided with a concave section from the lower end, the expanding node is installed inside the body, and its cone with the outer surface is tightly pressed to the concave section and provided with a cylindrical bottom the second sample, in which the intermediate sleeve is rigidly mounted, the said assembly is equipped with a funnel with conical and cylindrical sections on the inner surface, abutting against the end of the cone and having two cylindrical samples, the upper contacting with the upper zone of the inner surface of the cone and the lower rigidly connected to the fixing sleeve with an inner annular protrusion, and a shear element is installed between the ends of the mentioned bushings and the ledges of the cylindrical samples of the cone and funnel, and the inner diameters of the cylindrical of the funnel section and the annular protrusion of the fixing sleeve are selected for the diameter of the locking mechanism housing installed on the lower end of the pump-compressor pipes (tubing) lowered into the additional casing and provided with a ring bore from the lower end side, in which the sleeve is rigidly mounted with a conical outer cut in the upper part, and in the area of the conical cut is a conical split ring that interacts in the working position with the annular protrusion of the fixing sleeve, and an additional casing The well string at the wellhead is rigidly connected to wellhead equipment.

The disadvantages of the device:

firstly, the complexity of the design, due to the presence of a large number of nodes and parts;

secondly, mechanical packing leads to large landing forces (for an aluminum pipe - 15-17 tons, for steel - 35-40 tons), acting on an additional casing, on which the packing device is lowered;

thirdly, the ability to use the device is limited by the technical characteristics of the lifting unit;

fourthly, when relieving pressure and landing force, the additional column returns to its original state with great effort (depending on the applied force from 15 to 40 tons), which can lead to disruption from the landing site after installation.

The closest in technical essence and the achieved result to the proposed one is a packer device for an additional casing string (RF patent No. 2254441, IPC 7 ЕВВ 33/12, published in bulletin No. 17 dated 06/20/2005), containing a housing made in the form a pipe with an elastic sleeve installed on it, an expanding unit with a cone, a shear element, a mechanism that is lowered on the pipe string into an additional casing and interacting from above on the expansion unit, while the expanding element is located in the pipe on top and the cone is fixed m down, while the mechanism is made in the form of a pusher at the bottom and the anchor assembly at the top, and the pusher is made in the form of a hydraulic cylinder, made with the possibility of pressure from above with an expanding unit and equipped with a piston and a hollow rod, which is connected to the piston rigidly and tightly to the pipe string with the possibility of axial movement upward, while the anchor unit is made in the form of dies mounted on a hollow rod with the possibility of radial movement outward when moving the hollow rod upward relative to the pipe string, while shear ent fixes the hollow shaft relative to the pipe string while running in hole.

The disadvantages of this device are:

firstly, the complexity of the design associated with a large number of nodes and parts, in particular, a complex mechanism consisting of a pusher and an anchor node;

secondly, during the descent of the device on the pipe string into the well, which is filled with the borehole fluid, the borehole fluid is poured out at the wellhead, which drains the duration of the descent and contaminates the area adjacent to the well, and after the pipe string is lowered, it must be filled with technological fluid to drive the piston of the hydraulic cylinder of the mechanism. In addition, when lifting the pipe string (after planting the device), liquid is also spilled from the pipe string at the wellhead;

The technical task of the utility model is to simplify the design, as well as the elimination of the outflow of fluid at the wellhead in the process of lowering and raising the mechanism

The technical problem is solved by the proposed packer device of an additional casing string, comprising a housing made in the form of a pipe with installed

an elastic cuff on it, an expanding assembly with a cone, a mechanism lowered on the pipe string into an additional casing and interacting from above onto the expanding assembly, while the expanding assembly is located in the nozzle from above and is fixed with a cone down, the mechanism being made in the form of a pusher having the possibility of pressure on top of the expansion unit and consisting of a hydraulic cylinder and a hollow rod.

New is that the mechanism is equipped with a packer consisting of a housing and a sleeve, as well as a sealing element installed between them, and the sleeve is placed telescopically on top of the housing with the possibility of limited axial movement and radial expansion of the sealing element outward in the working position, with the hollow rod on top rigidly connected to the packer body, and from below with a hydraulic cylinder made through, and the hollow rod is equipped with a number of radial channels, and in the pipe string above the packer a number of radial Verstov informing internal space of the pipe string and the secondary casing, with a number of radial holes formed in the pipe string is sealed inside overlapped movable sleeve fixed in the pipe string by a shear element, wherein the sliding sleeve is equipped with a top seat for the ball.

The figure shows the proposed packer device for additional casing in longitudinal section.

The packing device of the additional casing string 1 consists of a housing 2 made in the form of a pipe 3, on the outer surface of which an elastic sleeve 4 is installed, expanding the assembly 5 with the cone 6, mechanism 7, which is lowered on the pipe string 8 into the additional casing string 1 and interacting from above with the expanding unit 5. The expanding unit 5 is located on top and fixed by a cone 6 down in the nozzle 3. The mechanism 7 is made in the form of a pusher 9, with the possibility of pressure from above on the expanding unit 5 and consisting of a hydraulic cylinder 10, flax through and hollow rod 11, provided with a number of radial channels 12. The mechanism 7 is equipped with a packer 13, installed between the pipe string 8 and the hollow rod 11.

The packer 13 consists of a housing 14 and a sleeve 15, as well as a sealing element 16 installed between them, and the sleeve 15 is placed telescopically on the housing 14 from above with the possibility of limited axial movement and radial expansion of the sealing element 16 to the outside.

The hollow rod 11 is rigidly connected from below to the hydraulic cylinder 10, and from above to the packer 13. In the pipe string 8 above the packer 13 a number of radial holes 17 are made, communicating

the inner spaces 18 and 19, respectively, the pipe string 8 and the additional casing 1.

A series of radial holes 17, made in the pipe string 8 hermetically from the inside, is blocked by a movable sleeve 20 fixed in the pipe string by a shear element 21. In addition, the movable sleeve 21 is equipped with a saddle 22 on top of the ball 23.

Packing device additional casing operates as follows.

The packer assembly as shown in the figure at the end of the additional casing 1 is lowered into the well, while the housing 2, made in the form of a pipe 3 with an elastic sleeve 4, is externally set below the violation interval (not shown) of the well casing.

Next, the additional casing 1 is hermetically and rigidly fixed at the wellhead on the support flange of the casing (not shown in Fig.).

After that, the pipe string 8 with the mechanism 7 at the lower end is lowered into the additional casing 1, while during the descent of the pipe string 8 into the additional casing 1, the liquid in the well does not spill onto the surface, contaminating it, and does not slow down the speed of descent the pipe string 8, and fills the internal spaces 18 and 19, respectively, the pipe string 8 and the additional casing 1 through the outer space of the packer 13 and a series of radial holes 15. The descent of the pipe string 8 with the mechanism 7 at the end continues until x until the pusher 9 is supported by the hydraulic cylinder 10 on the expanding unit 5 (determined by reducing the weight of the pipe string 8), while the sleeve 15 of the packer 13 moves under the action of the weight of the pipe string 8 relative to the housing 14 of the packer 13 rigidly connected by the hollow rod 11 with the hydraulic cylinder 10 supported on the expansion unit 5. As a result, the sealing element 16 of the packer 13 is compressed, and radially expanding outward, is pressed against the inner walls of the additional casing 1.

Then, the internal spaces 17 and 18, respectively, of the pipe string 8 and the additional casing string 1 are filled with the process fluid from the wellhead, and then the space between the additional casing string 1 and the pipe string 8 with the wellhead gland is sealed (not shown), allowing in the process of planting the device to the string of pipes 8 hermetically move relative to the additional casing string 1, rigidly mounted on the supporting flange of the casing string. Further, in the pipe string 8 and, accordingly, inside the mechanism 7 and the pusher 9, consisting of a hydraulic cylinder 10 and a hollow rod 11, overpressure is created by means of a pump unit (not shown in Fig.), While overpressure

it is transmitted in the inner space 18 of the pipe string 8 to the hydraulic cylinder 10, which is plugged from below, and in the inner space 19 of the additional casing string 1 to the sealing element 16 of the packer 13, which is pressed against the inner walls of the additional casing string 1 and does not let the liquid pass from top to bottom, while at a certain moment, as the overpressure increases, the pipe string 8 and the entire mechanism 7, including the packer 13 and hydraulic cylinder 10 begin to move downward, while the hydraulic cylinder 10 exerts pressure on the expanding assembly 5. node 5 yayuschy cone 6 extends pipe 3 to the pressing elastic cuffs 4 to additional casing 1 by insulating violation well casing. After the passage of the casing 2 by the expanding unit 5, the latter falls on the bottom (in Fig. Not shown) of the well. As a result, the pusher 9 together with the hollow rod 11 and the packer body 14 are moved downward relative to the sleeve 15 of the packer 13, while the sealing element 16 of the packer 3 moves away from the inner walls of the additional casing 1 and returns to its original position. The installation process of the packer device of the additional casing string 1 is completed. Further, overpressure is raised in the pipe string 8, in this case, the shear element 21 is destroyed and the movable sleeve 20 moves down with the ball 23 sitting on its saddle 22 until it stops in the lower end of the hydraulic cylinder 10, made through. As a result, a series of radial holes 17 opens and the pressure inside the pipe string 8 drops sharply.

Further, the pressure inside the pipe string 8 is released, while the space of the additional casing 1 under the packer 13 communicates with the internal space 18 of the pipe string 8 through a series of radial channels 12 of the hollow rod 11, in addition, the borehole fluid located in the internal space 19 of the additional casing 1 flows through a series of radial holes 17 of the pipe string 8 and the inner space 18 of the pipe string 8, through a series of radial channels 12 of the hollow rod 11 into the space of the additional casing 1 under the packer m 13, as a result of which the outflow of the borehole fluid at the wellhead is excluded with a further rise in the pipe string 8. After that, the pipe string 8 with mechanism 9 is removed from the well.

The proposed packer device of the additional casing string has a simple design and eliminates the outflow of borehole fluid at the wellhead during the descent and lifting of the mechanism on the pipe string into the additional casing string, which does not delay the duration of tripping operations and does not contaminate the area adjacent to the well.

Claims (1)

A packer device for an additional casing string, comprising a housing made in the form of a pipe with an elastic sleeve installed on it, an expanding assembly with a cone, a mechanism that is lowered on the pipe string into an additional casing string and interacting from above onto the expansion assembly, while the expansion assembly is located in the pipe from above and fixed by a cone down, and the mechanism is made in the form of a pusher having the possibility of pressure from above on the expanding unit and consisting of a hydraulic cylinder and a hollow rod, characterized in that the mechanism is equipped with a packer consisting of a housing and a sleeve, as well as a sealing element installed between them, and the sleeve is placed telescopically on top of the housing with the possibility of limited axial movement and radial expansion of the sealing element outward in the operating position, while the hollow rod is rigidly connected to the top the packer body, and from below with a hydraulic cylinder made through, and the hollow rod is equipped with a number of radial channels, and in the pipe string above the packer a number of radial holes are made, I inform s internal space of the pipe string and the secondary casing, with a number of radial holes formed in the pipe string is sealed inside overlapped movable sleeve fixed in the pipe string by a shear element, wherein the sliding sleeve is equipped with a top seat for the ball.