RU186556U1 - Production string sealing device - Google Patents

Abstract

The utility model relates to the oil industry, in particular to the field of sealing a production string. A device for sealing a casing string in a well includes a pipe with the ability to assemble from separate sections with connected narrowed upper and lower tips with elastic seals on the outside, inside of which are upper and lower expanding punches interacting with a hydraulic landing tool containing a cylinder and a piston with hollow rods. The landing tool is made with the possibility of passage through the pipe and extended tips and interacts with the cylinder with the lower punch. The hollow rod of the landing tool is connected to the column of process pipes through a hollow rod passing inside the device, on which, with limited movement, a lower grip is mounted that interacts with the pipe above the lower tip, and the upper grip is rigidly fixed at a certain distance above the landing tool. An emphasis is mounted and fixed with the possibility of tearing upward by a given load on the upper end face of the upper tip. The planting tool is placed inside the pipe above the lower tip, and its cylinder is provided at the bottom with a rod to which the lower punch is attached. The upper punch can be made integral of the guide and the expanding parts, with the expanding part located directly in the upper tip and the guide below the upper grip. The proposed device allows you to place the planting tool inside the pipe when expanding the lower tip. In addition to the tasks indicated at the beginning of the description, it is also possible to reduce the passage of the expandable lower tip if it is necessary to increase the thickness of its wall, and the increase in the transverse dimensions of the upper grip due to the implementation of the upper punch composite allows to increase its strength and, accordingly, reliability. 3 ill.

Description

The utility model relates to the oil industry, in particular to the field of casing sealing.

A device for sealing a production casing in a well is known (patent for utility model RU No. 100799, IPC ЕВВ 29/10, publ. 12/27/2010, bull. No. 36), including a drive with two expanding punches placed on one rod, and an expandable nozzle with a reduced inner diameter of the end sections, characterized in that the inner diameter of the end sections of the pipe is reduced by narrowing them without increasing the thickness, and the narrowed end sections of the pipe are pre-expanded at the ends by a length of at least two thicknesses n the walls of the pipe at its ends, and on the outside they are wearing elastic seals made in the form of a thin-walled cylindrical shell and secured against movement from one end on the collar of the pipe, the upper punch installed below the upper end section at a distance sufficient to expand the lower end section, and for overlapping long sections of the casing string, the nozzle can be prefabricated from several pipes connected at the wellhead by thread or welding.

The disadvantages of the device are the limitation of the length of the device due to the loading of the entire pipe when expanding the lower tip and the length of the tips due to the use of one working stroke of the hydraulic landing device to expand both tips. Also disadvantages are loss of stability, crushing, violation of threaded connections when loading the entire pipe with a large length.

A known device is a removable threaded patch for sealing violations of the production casing (patent RU No. 2592310, IPC ЕВВ 29/10, publ. 07/20/2016 in bull. No. 20), including the upper and lower packing elements, which are placed on the sealing cuffs, hydraulic landing tool with a rod, upper and lower conical mandrels, characterized in that the device is equipped with a second hydraulic landing tool including a catcher, an adapter located between the upper and lower packing elements having a landing seat o with a flange, a chamfer and a folding ring installed in the adapter seat and having free travel, the packing elements are made with the possibility of their alternating expansion, starting from the top, as a result of two round-trip operations with the alternate use of two hydraulic landing tools, the folding ring is made with the possibility of abutment in the chamfer of the lower part of the adapter, having a smaller inner diameter relative to the upper, when interacting with the second hydraulic landing tool when lowering it with the possibility of subsequent opening of the ring segments after stopping it against the edge of the adapter seat when lifting the second hydraulic landing tool to ensure the passage of the lower cone mandrel after the expansion of the lower packing element, the lower packing element contains a fishing nozzle, and the upper and lower packing elements are made with cut notches on the body.

The disadvantages of the device are the complexity of operations and low reliability.

Closest in its technical essence to the proposed device for sealing the production casing (patent RU No. 2465435, IPC ЕВВ 29/10, publ. 10/27/2012 in bull. No. 30), including a pipe with the ability to assemble from separate sections with connected narrowed upper and lower tips, inside of which are placed the upper and lower expanding punches that interact with the hydraulic landing tool, and outside - elastic seals, characterized in that the landing tool is made with the possibility of passage through the pipe and expanded tips and interacts with the cylinder with the lower punch, the hollow rod of the landing tool is connected to the column of process pipes through a hollow rod passing inside the device, on which, with limited movement, a lower grip is installed that interacts with the pipe above the lower tip and is rigidly fixed at a certain distance above the landing tool, an upper grip made with an outer dimension smaller than the axial channel of the upper punch, and at the upper end of the upper tip the emphasis is installed and fixed with the possibility of breaking up.

The disadvantages of the device are low strength and reliability, because the landing tool, having a large length (3-4 m), is installed below the lower tip, which leads to its deformation when the device is lowered into the well due to joints and irregularities in the production string and, ultimately, to poor expansion and even jamming of the landing tool in him. Low reliability is due to the fact that the upper grip must move through the passage of the upper punch, therefore, it has small transverse dimensions and, accordingly, low strength.

The technical tasks of the proposed device are to increase the strength and reliability of the device by placing the planting tool inside the pipe when expanding the lower tip, reducing the passage of the expanding lower tip if necessary, increasing the thickness of its wall, as well as increasing the transverse dimensions of the upper grip due to the implementation of the upper punch compound.

These problems are solved by the proposed device for sealing the production casing in the well, including a pipe with the ability to assemble from separate sections with attached narrowed upper and lower tips with elastic seals on the outside, inside of which are placed upper and lower expansion punches that interact with a hydraulic landing tool containing a cylinder and a piston with hollow rods, and the landing tool is made with the possibility of passage through the pipe and extended tips and interacts with the cylinder with the lower punch, the hollow rod of the landing tool is connected to the column of process pipes through a hollow rod passing inside the device, on which, with limited movement, a lower grip is installed that interacts with the pipe above the lower tip and is rigidly fixed at a certain distance above the landing tool the upper grip, and on the upper end of the upper tip is installed and secured with the possibility of tearing up a predetermined load emphasis.

What is new is that the planting tool is placed inside the pipe above the lower tip, and its cylinder is provided at the bottom with a rod to which the lower punch is attached.

It is also new that the upper punch is made integral of the guide and the expanding parts, with the expanding part located directly in the upper tip, and the guide below the upper grip.

The essence of the utility model is that as a result of equipping the bottom of the cylinder of the landing tool with a rod with a punch, it was possible to move it inside the pipe, and the implementation of the upper punch with a composite made it possible to move its guide part under the upper grip, which, in turn, allowed to increase the size of the upper grip and , accordingly, hang its strength and reliability.

In FIG. 1 shows a device lowered into a well installation interval.

In FIG. 2 - the device after the expansion of the lower tip in the stage of readiness for the expansion of the upper tip.

In FIG. 3 - pipe installed in the well with expanded tips.

The device (Fig. 1) contains a multi-section pipe 1 with attached lower 2 and upper 3 lugs on which elastic seals 4 are fitted. Inside the lower lug 2 there is a lower punch 5 mounted on a stem 6 with a nut 7, expanding part of the upper punch 8 in the upper tip 3, a landing tool 9 with a cylinder 10, inside of which there is a piston 11 with a hollow rod 12 having a hole 13 above the piston, communicating the cavity of the rod 12 with the above-piston space of the cylinder 10. The hole 14 in the lower part of the cylinder 10 communicates Piston space with a well.

The hollow rod 12 through the hollow rod 15 is connected to the column of process pipes 16. On the rod 12 with limited movement to the sleeve 17 is a lower grip 18 with a groove 19, rested by a split ring 20 in the bores 21 of the pipe 1, and on top in the sleeve 17. Above, at a certain distance from the upper end 22 of the landing tool, the upper grip 23 with spring 24, dies 25 is rigidly fixed on the rod 15. At the upper end of the lower grip 18, below the upper grip 23, the guide part can be placed, if the upper punch 8 26 top punch 8.

An emphasis 28 is installed on the upper end 27 of the upper tip 3 with a passage 29 and a chamfer 30 and is fixed to the tip 3 with a shear pin 31. In addition, an opening 32 is made in the emphasis 28.

The device is lowered into the well with production casing 33 on the process pipes 16 so that the leakage interval 34 is between the elastic seals 4 of the lower 2 and upper 3 tips.

The device operates as follows.

After the descent of the device in the installation interval into the column of process pipes 16, fluid is injected under pressure. The fluid through the hollow rod 15, the hollow rod 12 and the hole in it 13 enters the landing tool 9. As a result of the pressure difference from the difference in injection pressures above the piston 11 and the borehole pressure below it, since, thanks to the hole 14 in the cylinder 10 under the piston 11, the pressure equal to the borehole, cylinder 10 moves upward, through the stem 6 and nut 7 pulls the lower punch 5 upward, expanding the lower tip 2 and pressing the seal 4 against the walls of the production string 33. The compression force acts only on the lower tip 2 and a short pipe section, included between the grooves 21 and the punch 5. The force acting on the piston 11 through the hollow rod 12 is transmitted through the sleeve 17 to the lower grip 18 and closes through the split ring 20 and the bore 21 on the lower part of the pipes 1. After the tip 2 has completely passed, the punch 5 comes out into the cavity of the pipe 1 and is released. The pipe 1 is fixed by the lower seal 4 to the walls of the production string 33.

After that, the pressure in the process pipes 16 is released and pulled up. The upper end 22 of the landing tool 9 pushes up the lower grip 18, the split ring 20 is compressed into the groove 19, detached from the bores 21 of the pipe 1 and moves together with the landing tool 9 upward, pushing the guide part 26 (if any) in front of it up and stop in the expanding part of the upper punch 8, while the lower grip abuts against the upper punch 8, and the upper grip 23 freely passes thanks to the chamfer 30 through the passage 29, and with the help of the spring 24, the dies 25 are fixed to the upper end face of the stop 28. At this stage of lifting tech logical pipe 16 piston 11 is pulled upward relative to the cylinder 10, translating planting tool 9 to the initial position (FIG. 2).

After that, the liquid is again injected under pressure into the process pipes 16 (Fig. 1).

Under the action of a differential pressure, the cylinder 10 (Fig. 2) again moves upward, pushing the lower grab 18 and the upper punch 8. But the load through the dies 25 of the upper grab and the stop 29 through the end 27 closes on the upper tip 3.

The punch 8 passes through the tip 3, expanding it and pressing against the walls of the production string 33 elastic seal 4, goes into the expanded upper part of the tip 3 and is released. In this case, the liquid pushed by the guide part 26, like a piston, leaves the space between it and the stop 28 with the capture 23 through the hole 32, without preventing expansion.

After that, depressurize the process pipes 16 and raise them. In this case, the guide portion 26 of the upper punch 8 abuts against the stop 29, under the load, the pin 31 is cut off, and the stop 29 along with all the equipment suspended on the rod 15 is removed from the well (Fig. 3).

A pipe 1 remains in the well (Fig. 3) with expanded tips 2 and 3 and seals 4 tightly pressed in the production string 33, between which the leaky interval 34 is enclosed and disconnected from the well.

When performing the landing tool 9, multi-cylinder, because of the need to achieve great effort, the rod 6 is equipped with the lower cylinder 10.

Since the wall thickness of the pipe 1 is limited, the grooves 21 cannot be deep, therefore they are made sequentially with several pieces or in the form of a threaded thread, respectively, and a response cutting is performed on the split ring 20.

Thus, the proposed device allows you to place the landing tool inside the pipe when expanding the lower tip. In addition to the tasks indicated at the beginning of the description, it is also possible to reduce the passage of the expandable lower tip if it is necessary to increase the thickness of its wall, and the increase in the transverse dimensions of the upper grip due to the implementation of the upper punch composite allows to increase its strength and, accordingly, reliability.

Claims (2)

1. A device for sealing a casing string in a well, comprising a pipe with the possibility of assembling from separate sections with connected narrowed upper and lower tips with elastic seals on the outside, inside of which are placed upper and lower expanding punches that interact with a hydraulic landing tool containing a cylinder and a piston with hollow rods, and the landing tool is made with the possibility of passage through the pipe and extended tips and interacts with the cylinder with the lower punch, the hollow rod of the planting tool is connected to the column of process pipes through a hollow rod passing inside the device, on which, with limited movement, a lower grip is mounted that interacts with the pipe above the lower tip and is fixed at a certain distance above the planting tool with an upper grip and an upper end the upper tip is installed and fixed with the possibility of disruption upward by a given load emphasis, characterized in that the landing tool is placed inside the pipe above neither the bottom tip, and its cylinder is provided in the lower part with a rod to which the lower punch is attached. 2. A device for sealing a casing string in a well according to claim 1, characterized in that the upper punch is made integral of the guide and the expanding parts, the expanding part being placed directly in the upper tip and the guide below the upper grip.

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