RU65111U1 - 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, which consists of a sealing element made in the form of an elastic sleeve, a housing and a sleeve, the upper and lower ends of the elastic sleeve being rigidly fixed to the housing and to the sleeve. The sleeve is telescopically placed on top of the housing with the possibility of limited axial movement and folding of the elastic sleeve in the working position, while the packer sleeve is rigidly connected to the lower end of the pipe string.

The hollow rod from the bottom is rigidly connected to the hydraulic cylinder, and from above to the packer body. 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, and the inner diameters of the cylindrical of the funnel section and the annular protrusion of the fixing sleeve are selected for the diameter of the locking mechanism housing mounted on the lower end of the tubing (tubing) lowered into an 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 part, 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, and an additional casing I the column at the wellhead is rigidly connected to the 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 an aluminum pipe - 15-17 tons, for steel - 35-40 tons), acting on an 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 unit;

fourthly, when relieving pressure and landing force, 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 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, while shear ent fixes the hollow shaft relative to the pipe string while running in hole.

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 duration of the descent and contaminates the area adjacent to the borehole, and after the pipe string is lowered, it must be filled with technological fluid for actuating the piston of the hydraulic cylinder of the mechanism. In addition, when lifting the pipe string (after planting the device), liquid 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 the elimination of the outflow of fluid at the wellhead in the process of lowering and raising 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 installed

an elastic cuff on it, an expanding assembly with a cone, a mechanism lowered on the pipe string into an additional casing and interacting from above onto the expanding assembly, while the expanding assembly is located in the nozzle from above and is fixed with a cone down, the mechanism being made in the form of a pusher having the possibility of pressure on top of the expansion unit and consisting of a hydraulic cylinder and a hollow rod.

What is new is that the hollow stem is equipped with a knock-off valve, and the mechanism is equipped with a packer consisting of a sealing element made in the form of an elastic sleeve, a housing and a sleeve, the upper and lower ends of the elastic sleeve being rigidly fixed to the housing and the sleeve, while the sleeve is telescopically placed on top of the casing with the possibility of limited axial movement and folding of the elastic sleeve in the working position, and the packer sleeve is rigidly connected to the lower end of the pipe string, and the hollow rod is rigidly connected to the top the packer body, and from the bottom with the hydraulic cylinder, while in the pipe string above the packer a number of radial holes are made, which communicates the internal spaces of the pipe string and additional casing string.

The figure shows the proposed packer device for additional casing in longitudinal section.

The packer device of the additional casing string 1 consists of a body 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, the mechanism 7, which is lowered on the pipe string 8 into the additional casing 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 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 the floor th rod 11, equipped with a whipping valve 12.

The mechanism 7 is equipped with a packer 13, consisting of a sealing element made in the form of an elastic sleeve 14, a housing 15 and a sleeve 16, the upper and lower ends of the elastic sleeve 14 are rigidly fixed with the housing 15 and with the sleeve 16, respectively. The sleeve 16 is telescopically placed on top of the housing 15 with the possibility of limited axial movement and folding of the elastic sleeve 14 in the working position, while the sleeve 16 of the packer 13 is rigidly connected to the lower end of the pipe string 8.

The hollow rod 11 is rigidly connected from below to the hydraulic cylinder 10, and from above to the housing 15 of the packer 13. In the pipe string 8 above the packer 13 a number of radial holes 17 are made,

communicating the internal spaces 18 and 19, respectively, the pipe string 8 and the additional casing 1.

Packing device additional casing operates as follows.

The packer assembly as shown in the figure at the end of the additional casing 1 is lowered into the well, 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 its 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 the sleeve 16 moves downward relative to case 15 under the influence of the weight of the pipe string 5, and the elastic sleeve 14 of the packer 13 is folded and occupies a working position, tightly pressing against the inner walls of the additional casing 1.

During the descent of the pipe string 8 into the additional casing 1, the fluid in the well does not spill onto the day surface, therefore, does not pollute it, nor does the pipe pipe 8 slow down and the internal spaces 18 and 19 are filled, respectively, of the pipe string 8 and additional casing 1.

Then, the internal spaces 18 and 19, 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 (Fig. Not shown), allowing the pipe string 8 to move hermetically during the planting process of the pipe relative to the additional casing 1, which is rigidly fixed to the supporting flange of the casing string, after which it is sealed at the wellhead the upper end of the pipe string 8.

Further, in the inner space 19 of the additional casing 1 from the wellhead, overpressure is created by means of a pump unit (not shown in Fig.), While the overpressure is transmitted in the inner space 19 to the elastic sleeve 14 of the packer 13 in the working position (see Fig.), which is hermetically pressed against the inner walls of the additional casing 1 and does not allow fluid to pass from top to bottom, and in the inner space 18 of the pipe string 5 is excessive

pressure is transferred from the inside to the end face of the hydraulic cylinder 10, and at a certain moment, as the excess increases in the internal spaces 18 and 19, respectively, of the pipe string 8 and additional casing 1, the pipe string 8 and the entire mechanism 7, including the hydraulic cylinder 10, begin to move downward, this, the hydraulic cylinder 10 exerts pressure on the expanding unit 5. The expanding unit 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 well casing.

After passing through the casing 2 by the expanding unit 5, the latter falls to the bottom (not shown in the figure) of the well, while the pressure inside the pipe string 8 drops sharply, and the elastic sleeve 14 of the packer 13 under the action of the weight of the casing 15 of the packer 13, the hollow rod 11 and the hydraulic cylinder 10 straightens and occupies a transport position. The installation process of the packer device of the additional casing string 1 is completed.

Next, 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 internal space 18 of the pipe string 8, in addition, the borehole fluid located in the internal space 19 additional casing 1 flows through a series of radial holes 17 and the inner space 18 of the pipe string 8, through the hole of the destroyed knockoff valve 12 of the hollow rod 11 into the space of the casing 1 under the packer 13, into Wii thereby avoiding the spout of the well fluid at the wellhead with a further rise of the pipe string 8. Thereafter tubing string 8 with the mechanism 7 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 hollow stem is equipped with a knock-off valve, and the mechanism is equipped with a packer consisting of a sealing element made in the form of an elastic sleeve, a housing and a sleeve, the upper and lower ends of the elastic sleeve being rigidly fixed to the housing and the sleeve, while the sleeve is telescopically placed on top of the housing with the possibility of limited axial movement and folding of the elastic sleeve in the working position, and the packer sleeve is rigidly connected to the lower end of the pipe string, and the hollow rod from above is rigidly connected to the packer body, and bottom - with a hydraulic cylinder, while in the pipe string above the packer a number of radial holes are made, which communicates the internal spaces of the pipe string and an additional casing string.