RU63423U1 - 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 and a hollow rod. In addition, 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 upper end of the hollow rod from the top is rigidly connected to the packer body, and the lower end of the pipe string is rigidly connected to the packer sleeve. The hydraulic cylinder on top is equipped with an internal cylindrical groove in which, with limited axial movement, a hollow rod is installed, equipped with a number of through channels sealed in the working position. 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. 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, the inner diameters of the cylindrical a portion of the funnel and the annular protrusion of the fixing sleeve is selected for the diameter of the locking mechanism housing mounted on the lower end of the pump-compressor pipes (tubing) lowered into the additional casing and provided with an annular bore from the lower end side, in which the sleeve is rigidly mounted with a conical outer cut in the upper parts, 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, an additional casing and wellhead rigidly connected to the wellhead.

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 aluminum pipe - 15-17 tons, for steel pipe - 35-40 tons), which compresses the 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 tower;

fourthly, when the landing force is removed when the pressure is removed, 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 assembly 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, shear element is fixed It emits a hollow rod relative to the pipe string during descent into the well.

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 drainage time and contaminates the area adjacent to the borehole, and after the pipe string is lowered, it must be filled process fluid for actuating the piston of the hydraulic cylinder of the mechanism. In addition, when lifting the pipe string (after planting the device), fluid 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 to eliminate the outflow of fluid at the wellhead during the descent and lifting of 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

an elastic cuff installed on it, an expanding assembly with a cone, a mechanism that is lowered onto the pipe string into an additional casing and interacting from above onto the expanding assembly, while the expanding assembly is located in the pipe from above and is fixed with a cone down, the mechanism being made in the form of a pusher having pressure from above on the expanding 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, while the upper end of the hollow the top of the rod is rigidly connected to the packer body, and the lower end of the pipe string is rigidly connected to the packer sleeve, and the hydraulic cylinder on top is provided with an internal cylindrical groove, in a hollow rod is installed with a possibility of limited axial movement, provided with a number of through channels sealed in the working position, the hollow rod being rigidly connected to the packer from above, while a number of radial holes are made in the pipe string above the packer, communicating the internal spaces of the pipe string and additional casing the columns.

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 expansion unit 5. The expansion unit 5 is located on top and fixed by a cone 6 down in the pipe 3. The mechanism 7 descends into an additional casing 1 on the pipe string 8 and is made in the form of a pusher 9, with the possibility of pressure I’m on top of the expansion unit 5, and the pusher 9 consists of a hydraulic cylinder 10 and a hollow rod 11. In addition, the mechanism 7 is equipped with a packer 12 consisting of a housing 13 and a sleeve 14, as well as a sealing element 15 installed between them, and the sleeve 14 is placed on top on the housing 13 telescopically with limited axial movement and radial expansion of the sealing element 15 outward in the working position.

The upper end of the hollow rod 11 is rigidly connected from above to the housing 13 of the packer 12, and the lower end of the pipe string 8 is rigidly connected to the sleeve 14 of the packer 12.

The hydraulic cylinder 10 is provided on top with an internal cylindrical groove 16, in which, with limited axial movement, a hollow rod 11 is installed, equipped with a number of through channels 17 sealed in the working position.

In the pipe string 8 above the packer 12, a series of radial holes 18 are made, communicating the internal spaces 19 and 20, respectively, of the additional casing string 1 and the pipe string 8. Unauthorized overflows of the working fluid are prevented by the sealing element 21.

The device operates as follows.

The packer assembly together with the expansion unit 5, as shown in the figure, is lowered into the well at the end of the additional casing 1, while the housing 2, made in the form of a pipe 3 with an elastic sleeve 4 from the outside, is set below the violation interval (in Fig. Not shown) 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, a pipe string 8 with a mechanism 7 at the lower end is lowered into an additional casing 1 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 lowering the pipe string 8, in the additional casing 1, the fluid located in the well does not spill onto the surface and does not pollute it, nor does it slow down the speed of the pipe string 8, while the well fluid from the bottom up through the annular space between the packer 12 and the inner and the walls of the additional casing string 1 and a series of radial holes 18 of the pipe string 8 fills the internal spaces 19 and 20, respectively, the pipe string 8 and the additional casing string 1. The pipe string 8 with the mechanism 7 at the end is lowered until the pusher 9 is equipped with a hydraulic cylinder 10 does not lean on the expanding unit 5 (determined by reducing the weight of the pipe string 8), while a number of through channels 17 of the hollow rod 11 are hermetically sealed by the inner cylindrical groove 16 of the hydraulic cylinder 10, occupying the working position, and the sleeve 14 pa EPA 12 under the influence of the weight of the pipe string 8 moves downward relative to the housing 13 of the packer 12, rigidly connected by means of the hollow rod 11 to the hydraulic cylinder 10, supported on the expanding unit 5, while the sealing element 15 of the packer 12 is compressed and, expanding radially outward, is pressed against the inner walls additional casing string 1.

Then, the process fluid is added from the wellhead to the internal spaces 19 and 20, respectively, of the additional casing string 1 and the pipe string 8,

then the space between the additional casing 1 and the pipe string 8 is sealed at the wellhead with a wellhead seal (not shown in FIG.), which allows the pipe string 8 to be hermetically moved during installation of the device relative to the additional casing 1, which is rigidly fixed to the wellhead on the support flange 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.) Installed at the wellhead, while overpressure is transmitted to the inner space 20 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 15 of the packer 12, which is pressed against the inner walls of the additional casing string 1 under the deis The weight of the pipe string 8 does not allow liquid to pass from top to bottom, and at a certain moment, as the overpressure increases, the pipe string 8 and the entire mechanism 7, including the hydraulic cylinder 10, begin to move downward, while the hydraulic cylinder 10 exerts pressure on the expanding assembly 5. The expanding the node 5 by the cone 6 expands the pipe 3 until the elastic sleeve 4 is pressed against the additional casing 1, isolating the violation of the casing string of the well. After the housing 2 passes by the expansion unit 5, the latter falls into the bottom (not shown in the figure) of the well, while the hydraulic cylinder 10 moves downward relative to the hollow rod 11 within its inner cylindrical groove 16. As a result, the pressure inside the pipe string 8 drops sharply. The installation process of the packer device of the additional casing string 1 is completed.

As a result, a series of through channels 17 of the hollow rod 11 are opened, hermetically closed in the working position, while the space of the casing 1 under the packer 12 communicates with the inner space 20 of the pipe string 8, in addition, the borehole fluid located in the inner space 19 of the additional casing 1 flows through a series of radial holes 18 into the inner space 20 of the pipe string 8, and this eliminates the outflow of the borehole fluid at the wellhead with a further rise in the pipe string 8.

Then the pipe string 8 with the mechanism 7 at the end 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 working position, while the hollow rod is rigidly connected to the top the packer body, and the lower end of the pipe string is rigidly connected to the packer sleeve, and the hydraulic cylinder on top is provided with an inner cylindrical groove, in which axial movement of the hollow rod set provided with adjacent through channels sealingly overlapped in the operating position, wherein the hollow rod rigidly connected to the top of the packer, while in the pipe string above the packer formed a series of radial opening communicating the interior spaces of the pipe string and the additional casing.