RU63419U1 - 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 equipped with a knock-off valve. The mechanism is equipped with a packer mounted on the lower end of the pipe string and made in the form of a self-sealing cuff, passing from bottom to top. The hollow rod is rigidly connected from below to the hydraulic cylinder, and from above to the 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. 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 annular protrusion of the fixing sleeve is selected for the diameter of the lock mechanism housing mounted 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 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 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 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 the fact that the mechanism is equipped with a packer mounted on the lower end of the pipe string and made in the form of a self-sealing cuff, passing from bottom to top, while the hollow rod is rigidly connected from below to the hydraulic cylinder, and from above to the packer, and the hollow rod is equipped with a shut-off valve, while in the pipe string above the packer, a series of radial holes are made, communicating the interior spaces of the pipe string and an additional casing string.

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 expanding unit 5 is located on top and fixed downward by a cone 6 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 and a hollow rod 11 equipped with a relief valve 12.

The mechanism 7 is equipped with a packer 13 mounted on the lower end of the pipe string 8 and made in the form of a self-sealing cuff 14, passing from the bottom up. 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 series of radial holes 15 are made, communicating the interior spaces 16 and 17, respectively, of the pipe string 8 and the additional casing 1.

The device operates as follows.

The packer assembly, 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, 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, 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 liquid located in the well does not spill onto the day surface without contaminating it and does not slow down the speed of the pipe string 8, but fills the internal spaces 16 and 17, respectively, of the pipe string 8 and additional casing 1 through a self-sealing cuff 14, passing the borehole fluid from the bottom up and a number of radial holes 15.

Then, the internal spaces 16 and 17, 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 1, rigidly fixed to the wellhead on the supporting flange of the casing.

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 16 of the pipe string 8 to the hydraulic cylinder 10, which is plugged from below, and in the inner space 17 of the additional casing 1 to the self-sealing sleeve 14, which is pressed against the inner walls of the additional casing 1 and not accelerates the liquid 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 assembly 5 by the cone 6 expands the pipe 3 before pressing the elastic cuff 4 to the additional casing 1, isolating the violation of the casing of the well.

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 pressure inside the pipe string 8 drops sharply. The installation process of the packer device of the additional casing string 1 is completed. The pressure inside the pipe string 8 is discharged and a waste organ (for example, crowbar) is discharged into the pipe string 8, which destroys the relief valve 12, while

the space of the additional casing string 1 under the packer 13 communicates with the inner space 16 of the pipe string 8, thereby eliminating the outflow of the wellbore fluid at the wellhead during further lifting of the pipe string 8, since the wellbore fluid located in the inner space 17 of the additional casing string 1 flows through a series of radial holes 15 through the inner space 16 of the pipe string 8 and through the hole of the destroyed whipping valve 12 into the space of the additional casing 1 under the packer 13.

Then the pipe string 9 with the mechanism 8 is removed from the well.

As a result, after the passage of the pipe 3 by the expanding unit 5, great efforts are not acting on the housing 2 of the packing device after its installation, which can disrupt it, that is, break the tightness of the connection with the casing of 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 mounted on the lower end of the pipe string and made in the form of a self-sealing cuff, passing from bottom to top, while the hollow rod is rigidly connected from below to the hydraulic cylinder, and from above to the packer, and the hollow rod is equipped with a pin valve, while in the pipe string above the packer, a series of radial holes are made, communicating the interior spaces of the pipe string and additional casing string.