RU57348U1 - PACKING DEVICE FOR ADDITIONAL CASING - 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. A packing 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 shear element, a mechanism that is lowered onto the pipe string into an additional casing string and interacting from above with the expanding assembly. The expanding element is located in the nozzle from above and is fixed with a cone down. The mechanism is made in the form of a pusher at the bottom and an anchor assembly at the top. The pusher is made in the form of a hydraulic cylinder, made with the possibility of pressure from above on the expanding unit and equipped with a piston and floors with a rod, which is rigidly connected to the piston, and hermetically with axial movement up to the pipe string. The anchor assembly is made in the form of dies mounted on a hollow stem with the possibility of radial movement outward when moving the hollow rod upward relative to the pipe string. The shear element fixes the hollow rod relative to the pipe string during descent into the well. The hydraulic cylinder at the bottom is equipped with a stepped through central hole. In the hollow rod at its lower end, a pressure seat is installed under the ball discharged from the mouth. In the transport position, the pressure test seat is fixed relative to the hollow rod by means of a destructible element, and in the working position, the pressure test seat has the possibility of limited axial movement down to the stop in the stepped through central hole of the hydraulic cylinder. The proposed packer device of an additional casing string eliminates the pouring of well fluid onto the day surface, and also simplifies the sealing technology, while the device allows you to compress the pipe string at the required pressure in one run and then securely seal it. 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.

It is known “Packing device of an additional casing string” (Utility Model Patent of the Russian Federation No. 32182, IPC 7 E 21 B 33/12, publ. Bull. No. 25 of 09/10/2003), containing a housing made in the form of a pipe with installed on an elastic cuff extending the assembly including the cone and the shear element, the housing being a deformable element and provided with a concave portion from the lower end, the expansion assembly installed inside the housing, and its cone with the outer surface tightly pressed against the concave portion and provided with a bottom from the inside cylindrical a 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 section of the funnel and the annular protrusion of the retaining sleeve selected for the diameter of the housing of the locking mechanism 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 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 nna wellhead rigidly connected to 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, comprising a body made in the form of a pipe with an elastic sleeve installed on it, an expanding assembly with a cone, a shear element, a mechanism lowered onto the pipe string into an additional casing string, and interacting from above onto the expanding unit, while the expanding element is located in the nozzle from above and is fixed with a cone down, while the mechanism is made in the form of a pusher at the bottom and the anchor assembly at the top, the pusher is made in the form of a hydraulic cylinder made with the possibility of pressure from above with an expanding assembly and equipped with a piston and a hollow rod that is connected to the piston rigidly, and with the pipe string is hermetically axially movable 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, the shear element fixes the hollow rod relative to the pipe string during descent into the well.

The disadvantages of this device are:

firstly, during the descent of the mechanism on the pipe string into the well, which is filled with borehole fluid, the borehole fluid is poured out of the borehole onto the day surface, and therefore the area adjacent to the borehole is contaminated, so to eliminate this, it is necessary to drain the borehole fluid into the technological tank, in this case, after the descent of the pipe string, they must again be filled with process fluid to drive the piston of the hydraulic cylinder. All of the above complicates the process of packing the device;

secondly, the design of the device does not allow immediately before packing to pressure test the pipe string to the required pressure without additional tripping operations of the equipment (for example, a packer) or it is necessary to pressure test the pipe string separately.

The technical task of the utility model is to eliminate the spill of liquid on the day surface and simplify the process of packing, as well as create such a device design that allows you to pressure test the column in one run

pipes to the required pressure, and immediately after that make a reliable sealing.

The technical problem is solved by the proposed packer device of an additional casing string, comprising a body made in the form of a pipe with an elastic sleeve installed on it, an expanding unit with a cone, a shear element, a mechanism that is lowered onto the pipe string into an additional casing and interacting from above on the expanding unit, when this expanding element is located in the pipe on top and is fixed by a cone down, while the mechanism is made in the form of a pusher at the bottom and an 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 with a pipe string is hermetically axially movable 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, the shear element fixes the hollow rod relative to the pipe string during descent into the well.

What is new is that the hydraulic cylinder is equipped with a stepped through central hole at the bottom, and a pressure seat is installed in the hollow rod at its lower end for the ball to be discharged from the mouth, while in the transport position the pressure seat is fixed relative to the hollow stem with a destructible element, and in the working position the pressure seal the seat has the possibility of limited axial movement down to the stop in a step-through through the Central hole of the hydraulic cylinder.

In FIG. The proposed device is shown in longitudinal section.

The packer device of the additional casing string 1 consists of a housing 2 made in the form of a pipe 3 with an elastic sleeve 4 mounted on it, an expanding assembly 5 with a cone 6, a shear element 7, a mechanism 8, which is lowered on the pipe string 9 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 8 is made in the form of a pusher 10 at the bottom and an anchor unit 11 at the top. The pusher 10 is made in the form of a hydraulic cylinder 12, made with the possibility of pressure from above on the expanding unit 5 and equipped with a piston 13 and a hollow rod 14, which is rigidly connected to the piston 13, and hermetically with axial movement upward with the pipe string 9. The anchor assembly 11 is made in the form of dies 15 mounted on the hollow rod 14 with the possibility of radial movement outward when the hollow rod 14 is moved upward relative to the pipe string 9. This can be done, for example, by means of the stop 16 of the pipe string 9 and the wedge pusher 17 of the hollow rod 14 , With which

the dies 15 interact using the T-shaped connection and / or the dovetail connection in any combination, for example: with a wedge pusher 17 - using the "dovetail", and with the stop 16 - using the T-shaped connection. The shear element 7 fixes the hollow rod 14 relative to the pipe string 9 during descent into the well 18.

The hydraulic cylinder 12 is equipped with a stepped through central hole 19 from the bottom 19. A compression seat 20 is installed at the lower end of the hollow rod 14 for a ball 21. The compression seat 20 is fixed relative to the hollow stem 14 in the transport position by means of a destructible element 22, and in the working position, the pressure test the seat 20 has the possibility of limited axial movement down to the stop in a stepped through central hole 19 of the hydraulic cylinder 12. Unauthorized flow of fluid in the process of packing and devices are prevented by o-rings 23, 24, and 25.

The device operates as follows:

After examining the production casing of the well 18, a packer is lowered into it on the additional casing 1 so that the casing 2 is lower than the violations (not shown in Fig.) In the production casing of the well 18. In this case, the additional casing 1 is tightly and firmly fixed at the wellhead 26 of the hole 18. After that, a pipe string 9 with a mechanism 8 at the lower end is lowered into an additional casing 1 until the pusher 10 is supported by the hydraulic cylinder 12 on the expansion cone 4 (determined from the bottom the weight of the pipe string 9).

In the process of lowering the pipe string 9 with mechanism 8, the liquid located in the well through the stepped through central hole 19 of the hydraulic cylinder 12 enters the hollow rod 14 and the pipe string 9. Next, the pipe string 9 is crimped.

To do this, inside the pipe string 9, a ball 21 is dropped from the wellhead, which sits on the crimping seat 20 located inside the hollow rod 14 at its lower end. If necessary, fill the pipe string 9 with the process fluid, and then press the pipe string 9 to the required pressure by means of a pumping unit (not shown in FIG.). Further, a pressure is created in the pipe string 9 in excess of the shear force of the destructible element 22, as a result of which the latter is destroyed, and the compression seat 20, together with the ball 21, are moved down to the stop of the compression seat 21 into the stepwise through central hole 19 of the hydraulic cylinder 12, while the compression seat 21 is the sealing element 25 hermetically closes the stepped through central hole 19 of the hydraulic cylinder 12.

Then, by unloading the pipe string 9 to the calculated fracture force of the shear element 7, the latter is cut off, bringing the anchor assembly 11 into action. As a result, the stop 16 of the pipe string 9 moves downward relative to the expanding unit 5, and the hollow rod 14 with the wedge pusher 17 moves upward relative to the pipe string 9, pushing the dies 15 until their gear part is pressed against the additional casing 1. In this case, the hollow stem 14 is fixed relative to additional casing 1, after which overpressure is created in the pipe string 9, which is transmitted through the hollow stem 14 under the piston 13 to the hydraulic cylinder 12, which, thanks to the fixation of the hollow stem 14, moves downward, exerting pressure on the the expanding unit 5. In this case, the expanding unit 5 by the cone 6 expands the nozzle 3 until the elastic sleeve 4 is pressed against the additional casing 1, isolating the annular space 27 from the inner pipe 28, isolating the violations of the production casing 18. After the passage of the nozzle 3, the expanding unit 5 falls into the bottom wells 18 (not shown). As a result, the pressure inside the pipe string 9 first drops sharply, since there is no support for the hydraulic cylinder 12, and then increases sharply after the hydraulic cylinder 12 abuts the piston 13. The installation process keruyuschego device further pipe joint 1 is completed. The pressure in the pipe string 9 is released, as a result the latter rises, while the hollow rod 14 moves down relative to the pipe string 9, the wedge pusher 17 and the stop 16 are moved apart, the dies 15 disengage from the additional casing string 1. Then the pipe string 9 with a mechanism 8 is removed from the well 18. Since the force generated by the hydraulic cylinder 12 during expansion of the nozzle 3 is balanced by the anchor assembly 11, the additional casing does not extend. As a result, after the expansion unit 5 passes through the pipe 3, large efforts are not applied to the housing 2 of the packer device after its installation, which can disrupt it and violate the tightness of the connection with the casing string of the well.

The proposed packer device of an additional casing string eliminates the pouring of well fluid onto the day surface, and also simplifies the sealing technology, while the device allows you to compress the pipe string at the required pressure in one run and then securely seal it.

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 shear element, a mechanism that is lowered on the pipe string into an additional casing string and interacting from above on the expansion assembly, while the expanding element is located in the nozzle at the top and fixed with a cone 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 possible pressure on top of the expanding unit and equipped with a piston and a hollow rod, which is rigidly connected to the piston and hermetically with the pipe string with the possibility of axial upward movement, while the anchor unit is made in the form of dies mounted on a hollow rod with the possibility of radial outward movement moving the hollow rod upward relative to the pipe string, the shear element fixes the hollow rod relative to the pipe string during descent into the well, characterized in that the hydraulic cylinder from the bottom is equipped with a stepped through central hole, while in the hollow rod at its lower end there is a crimping seat for a ball being discharged from the mouth, while in the transport position the crimping seat is fixed relative to the hollow stem with a destructible element, and in the working position the crimping seat has the possibility of limited axial movement down to the stop stepped through central hole of the hydraulic cylinder.