RU2592310C1 - Extracted threaded patch device for sealing production string disorders - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry, in particular, to operation and repair of wells, and can be used for sealing disorders of production string and watered layers. Device includes the upper and the lower packer elements, where: sealing cups, hydraulic mounting tool with a rod, the upper and the lower conical mandrels, the second hydraulic mounting tool, including a catcher, an adapter arranged between the upper and the lower packer elements having a saddle with a side board, a face and a folding ring installed in the saddle of the adapter and having free travel, - are arranged. Packer elements are made with the ability of their alternative expansion, starting from the upper one, by two round-trip operations with alternate application of the two hydraulic mounting tools. Folding ring is designed to thrust against the face of the adapter lower part, having smaller inner diameter relative to the upper one; at its interaction with the second hydraulic mounting tool at its lowering and the ability of subsequent opening of the ring segments after its thrust against the saddle side board of the adapter when the second hydraulic mounting tool is lifted to ensure the lower conical mandrel after expansion of the lower packer element. Bottom packer element includes a fishing branch pipe.

EFFECT: higher efficiency and reliability of the patch are achieved, time costs are reduced.

1 cl, 4 dwg

Description

The invention relates to the oil industry, in particular to the operation and repair of wells, and can be used to seal violations of the production string and flooded formations in production and injection wells using an extractable threaded patch.

A device (analog) (1) for repairing a casing string in a well is known, patent for utility model RU 100799, comprising a pipe with tapered tips, gaskets, inside of which there are two punches mounted on one rod, and elastic seals are on the outside, and the pipe is made with the ability to assemble from several sections. 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 limitation of the length of the tips due to the use of one working stroke of the hydraulic landing device to expand both tips. A device for sealing a casing string (analogue) is known (2), patent RU 2236550, published September 20, 2004, the beginning of the patent on December 18, 2002.

The invention relates to the oil and gas industry, in particular to devices for sealing a casing string and shutting down formations. The device includes a patch in the form of a smooth metal pipe, a hydraulic landing tool and an expanding mandrel, made in the form of a truncated cone with a slope of the conical surface of 10-40 °, the diameter of the base of which is smaller than the difference between the inner diameter of the casing and double the thickness of the wall of the patch. At the ends of the patch in the cylindrical annular grooves are placed elastic seals. Their outer surface is made no larger than the transverse dimensions of the patch. The hydraulic landing tool is equipped with a hydraulic anchor. The length of the expandable nozzle increases and the tightness of the patch increases. The invention relates to the oil and gas industry, in particular to devices for sealing a casing string and shutting down formations. The disadvantages of the device are the limitation of length and low reliability.

A known method of repairing a well (analogue) (3), patent for invention No. 2494222, publication date 09/27/2013, patent validity date 17.10.2012.

The invention relates to the oil and gas industry and may find application in the repair of wells with casing violations. When implementing the method, descent is carried out in the interval of repair of the patch and anchor, landing of the anchor, expansion of the walls of the patch until they are pressed against the walls of the well. Work is carried out in a well with at least 6-inch worn-out production casing, with a plaster covering the interval of perforation of the production casing by at least 2 m on each side. Work with the patch is carried out in an aqueous solution of a surfactant. A new production casing is lowered into the well, the annulus between the old and new production casing is cemented, a new production casing, a cement ring between the plaster and the new production casing, the plaster and the old production casing are perforated in the interval of the producing formation. Improves sealing reliability. The invention relates to the oil and gas industry and may find application in the repair of wells with casing violations.

The disadvantages of this method are the need for cementation and the inability to extract the patch.

A device for sealing a casing string (prototype) (4), RU 2465435, ЕВВ 29/10 - restoration of casing pipes, for example, straightening.

The invention relates to the oil industry, in particular to the operation and repair of wells. The device includes a pipe with the possibility of assembling from separate sections with narrowed upper and lower tips attached to it, inside of which there are upper and lower expanding punches interacting with a hydraulic landing tool, and elastic seals on the outside. 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 technological 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 with an upper grip made with an external dimension less the axial channel of the upper punch. 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. Technological capabilities expand, reliability increases.

The disadvantages are the non-separable design, the length limit, the unreliability of welded joints, the need for hot work at hazardous production facilities, and corrosion of welds during operation. When installing the device, the lower tip first expands, while the emphasis is on the upper tip and the entire patch structure is deformed and remains energized.

The objective of the invention is to provide a device for a removable threaded (prefabricated) patch for sealing violations of the production string, which allows you to eliminate the restriction on the length, separately install the upper and lower packing elements, using a mechanism that eliminates the effect of axial load on them.

This problem is solved by the proposed device retrievable threaded (prefabricated) patch for sealing violations of the production casing with separate installation of packing elements with cut notches in the body, eliminating the sliding of the sealing lips and increasing the bearing capacity for shear, on which the sealing lips are installed, by alternately expanding the sealing elements, starting from the top, as a result of two hoisting operations with the alternate use of two hydraulic posad GOVERNMENTAL tools.

The essence of the invention lies in the fact that the device is a removable threaded patch for sealing violations of the production string includes upper and lower packing elements, on which are located the sealing cuffs, upper and lower conical mandrels. In this case, the extracted threaded patch contains packer elements, which are made with cut notches along the body, on which sealing cuffs are placed. Packing elements are made with the possibility of alternating expansion, starting from the top, as a result of two tripping operations with the alternate use of two hydraulic landing tools. During the first round-trip operation, the first hydraulic landing tool, by means of a cone mandrel, expands the upper packing element with cut notches along the body by expanding, while the sealing collar ensures the tightness of the device and fixation of the extracted threaded patch relative to the production string. Next, the first hydraulic landing tool with a conical mandrel is hoisted. The device also contains a second hydraulic landing tool with a catcher (downhole inner tube), which during the second round-trip operation passes through the expanded hole of the upper packing element with cut notches along the body. The device is equipped with an adapter, which is made of two parts and contains a seat saddle with a flange, a chamfer and a folding ring installed in the saddle of the adapter with free travel. 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, which provides reliable support for the second hydraulic landing tool when moving down and with the possibility of opening segments of the ring after stopping it in the rim of the landing seat of the adapter when lifting the second hydraulic landing tool . At the same time, the catcher (downhole inner tube) enters the catch pipe of the lower packer element with cut notches along the body, and the hydraulic landing tool abuts against the folding ring. Further, due to the injection of fluid in the hydraulic landing tool, excessive pressure is created, which actuates the rod of the hydraulic landing tool, the rod of the hydraulic landing tool together with the cone mandrel and fishing nozzle move up. In this case, the lower packer device is turned off with a pressure gauge control at the wellhead until the signal is triggered - pressure drops, and the sealing sleeve ensures the device is tight and the extracted threaded patch is fixed relative to the production string. When lifting the second hydraulic landing tool together with the cone mandrel, centralizer and fishing nozzle, the cone mandrel pushes the folding ring, which, abutting against the side of the seat saddle, begins to open, the segments of the folding ring open and fit into the part of the saddle having a diameter that allows the cone mandrel to pass .

Due to the use of an adapter with a special folding ring, the load is removed from the already installed upper packing element, which contributes to the free extraction of the hydraulic landing tool with a conical mandrel and fishing nozzle due to the application of all the load on the special folding ring. An equal-passage channel of the extracted threaded patch is provided. The design of the patch allows you to cover an interval of up to hundreds of meters, depending on the bearing capacity of the packing elements with cut notches along the body. The notches on the case of the packing elements, eliminating the sliding of the sealing cuffs, increase the shear bearing capacity.

In FIG. 1 shows the device of the upper part of the extracted threaded patch for sealing violations of the production casing, which allows covering an interval of up to hundreds of meters with a hydraulic landing tool, explaining its operation. In FIG. 2 shows the arrangement of the lower part of a retrievable threaded patch for sealing production string failures. In FIG. 3 shows an adapter device with a folding ring. In FIG. 4 shows the design of a folding ring.

The removable threaded patch consists of an upper packing element with cut notches along the body 17 (Fig. 1) with sealing cuffs 14, a conical mandrel 18, an abutment 20 with a sleeve 22 and a rod 23, and a lower packing element with cut notches along the body 4 (Fig. 2) ) with sealing cuffs 5, conical mandrel 3, lower stop 1, centralizer 25, adapter, which is made of a two-part prefabricated, lower 10 and upper 13, landing seat 6 with chamfer 7, with a folding ring 11 made of steel or alloys mounted in it part of which is executed in the form of segments, extension coil 9 for selecting the length for the hydraulic landing tool 15, fishing nozzle 26. The folding ring 11 is made with the possibility of abutment in the chamfer 7 of the lower part 10 of the adapter, having a smaller diameter relative to the upper 13, which provides a reliable stop to the second hydraulic landing tool 15 when moving downward and with the possibility of opening segments of the ring after stopping it against the edge of the landing seat 6 of the adapter when lifting the second hydraulic landing tool 15. Upper and lower parts of the extracted threaded patch are connected by the pipe arrangement 16 (FIG. 1, 2) the required length. The assembly of the recoverable threaded patch was carried out using threaded connections. In FIG. 3 shows the adapter device, which is made of two parts, the upper 13 and lower 10, the lower part is made with a smaller inner diameter with a bevel 7, with a folding ring 11 of steel or alloys, part of which is made in the form of segments.

The operation of the device is a removable threaded patch for sealing violations of the production casing is as follows.

During the first round-trip operation, the first hydraulic landing tool 24 (Fig. 1) with rods 21 and nozzle 19 on the rod 21 by means of a conical mandrel 18, by means of expansion, install the upper packing element with cut notches along the housing 17. At the same time, the sealing collar 14 provides tightness and fixation of the extracted threaded patch relative to the production string. Next, the first hydraulic landing tool 24 with the conical mandrel 18 is hoisted. During the second round-trip operation, the second hydraulic landing tool 15 (Fig. 2) with the rod 8 and the catcher (downhole inner tube) 2 passes through the expanded hole of the upper packing element with cut notches along the housing 17, while the catcher (downhole inner tube) 2 enters the fishing nozzle 26 of the lower packer element with cut notches along the housing 4, and the hydraulic landing tool t 15 abuts against the abutment 12 folding ring 11 of steel or alloys, part of which is in the form of segments having free wheeling and preventing further passage of the hydraulic setting tool when moving downward, the seat 6 mounted in the lower portion 10 of the adapter. In turn, when loaded, the folding ring 11 abuts against the chamfer 7 of the lower part 10 of the adapter, which has a smaller diameter relative to the upper, which provides reliable support to the landing tool. After expanding the lower packing element 4 with the conical mandrel 3 and sealing with the sealing collar 5, the hydraulic landing tool 15 is lifted together with the conical mandrel 3, the centralizer 25 and the fishing nozzle 26. When lifting, the conical mandrel 3 pushes the folding ring 11, which abuts against the side the seat saddle 6 begins to open, the segments of the folding ring 11 open and fit into the part of the saddle 6, having a diameter that allows the passage of the conical mandrel 3.

New is that due to the use of an adapter with a folding ring, the load is removed from the already installed upper packing element with cut notches along the body, which contributes to the free extraction of the hydraulic landing tool with a conical mandrel and fishing nozzle due to the application of all the load on the folding ring. The assembly of the recoverable threaded patch was carried out using threaded connections. An equal-passage channel of the extracted threaded patch is provided, its design allows you to cover an interval of up to hundreds of meters, depending on the bearing capacity of the packer elements with cut notches along the body. The notches on the case of the packing elements, eliminating the sliding of the sealing cuffs, increase the shear bearing capacity.

Technological and technical results when using the device of the extracted threaded patch for sealing violations of the production string are achieved by accelerating the installation of the extracted threaded patch due to its assembly using threaded connections, an equal passage channel, simplicity of design, installation using standard hydraulic landing tools and the reliability of the installation of packers elements with cut notches along the body, lack of welded joints, corrosion of welds When exploitation, exclusion of fire works on dangerous industrial objects.

The economic effect of the use of the invention can be achieved by increasing the time between failures, accelerating installation, extending the life of the device.

Claims (1)

The device is a removable threaded patch for sealing violations of the production string, including the upper and lower packing elements, on which the sealing cuffs are placed, a 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 seat saddle with a flange, a chamfer and a folding ring installed in the saddle of the adapter and having free travel, the packer elements are made with the possibility of their alternate expansion, starting from the top, as a result of two tripping and lifting operations with the 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 inner diameter relative to the upper, when interacting with the second hydraulic landing tool when lowering it and with the possibility of subsequent opening of the ring segments n 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 along the body.

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