RU61780U1 - 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 with an elastic sleeve installed on it, an expanding assembly with a cone, a mechanism that is lowered onto the rope 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 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 a hollow rod. The anchor assembly is made in the form of an abutment, a wedge pusher, and dies mounted on a hollow stem, while the abutment with the dies interact using a T-shaped connection and / or a dovetail connection. The hollow rod is rigidly connected to the piston, and with a stop, it is hermetically sealed with the possibility of axial upward movement. The dies of the anchor assembly are placed on the hollow rod with the possibility of radial movement outward, in the working position when the hollow rod moves upward relative to the stop and interacts with them from below the wedge pusher. The emphasis on the outside is equipped with a self-sealing cuff, which allows fluid to pass from bottom to top, and is tightly pressed by the collar to the inner walls of the additional casing string. From above, a load equipped with radial holes is screwed into the stop. The hollow rod above the wedge pusher is equipped with through holes that allow fluid to pass through during the lowering and raising of the mechanism. The proposed packer device of an additional casing string allows eliminating, having poured out the wellbore fluid onto the day surface, at the wellhead during the descent and lifting of the mechanism into the additional casing string, and also speeds up and simplifies the process of sealing the elastic cuff of the device by lowering the mechanism on the rope. 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" (patent for utility model of the Russian Federation No. 32182, IPC 7 E 21 B 33/12, published in Bulletin No. 25 of 09/10/2003), containing a housing made in the form of a pipe with installed an elastic cuff on it, an expanding assembly including a cone, and a shear element, wherein the housing is a deformable element and is provided with a concave portion from the lower end, the expansion assembly is mounted inside the housing, and its cone with the outer surface is tightly pressed against the concave portion and provided with the bottom from the inside side cylindrical With a female 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 about 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 tubing lowered into the additional casing and equipped with an annular bore from the lower end, 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, 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 (RF patent No. 2254441, IPC 7 E 21 B 33/12, published in bulletin No. 17 dated 06/20/2005), comprising a housing 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 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 ohm down, 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 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 sits a hollow rod relative to the pipe string during descent into the well.

The disadvantages of this device are:

firstly, during the descent and lifting of the mechanism on the pipe string into the borehole, which is filled with borehole fluid, the borehole fluid spills from the borehole to 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 capacity, and after lowering the pipe string with the mechanism at the end to the required interval of the well, it is necessary to fill the pipe string with the process fluid to drive the hydraulic cylinder piston m nisms. In addition, before packing the elastic cuff of the device, it is necessary to crimp the pipe string, at the end of which there is a mechanism. All of the above complicates the process of packing the elastic cuff of the device;

secondly, the descent of the mechanism at the end of the pipe string increases the duration of the work as a whole.

The technical task of the utility model is to eliminate the outflow of liquid onto the surface during the descent and ascent of the mechanism, as well as the acceleration and simplification of the process of packing the elastic cuff of the device.

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 mechanism that is lowered into an additional casing and interacting from above on the expanding unit, while the expanding unit is located in the pipe above 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 the possibility of pressure from above with an expanding unit and equipped with a piston and a hollow rod, and the anchor unit is made in the form of an abutment, a wedge pusher, and dies mounted on a hollow rod, while the hollow rod is rigidly connected to the piston, and with an emphasis it is hermetically sealed with the possibility of axial movement up, the anchor unit dies are placed on the hollow rod with the possibility of radial movement outward when the hollow rod moves upward relative to the stop.

What is new is that the mechanism descends into an additional casing string on the rope, and the support on the outside is equipped with a self-sealing cuff that allows fluid to pass from bottom to top, while on top of the stop a load equipped with radial holes is screwed on top, and the hollow rod above the wedge pusher is equipped with through holes for bypass fluid in the process of lowering and lifting the mechanism into an additional casing, while the wedge pusher interacts with the dies of the anchor assembly in the working position.

The figure shows the proposed device 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 unit 5 with a cone 6, a mechanism 7, lowered on the cable 8 into an 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 pipe 3. The mechanism 7 is made in the form of a pusher 9 at the bottom and an anchor unit 10 at the top. The pusher 9 is made in the form of a hydraulic cylinder 11, made with the possibility of pressure from above on the expanding unit 5 and equipped with a piston 12 and a hollow rod 13.

The anchor assembly 10 is made in the form of an abutment 14, a wedge pusher 15 and dies 16. mounted on a hollow stem 13, while the abutment 14 and dies 16 interact with a T-shaped connection or a dovetail joint.

The hollow rod 13 is connected to the piston 12 rigidly, and with an emphasis 14 - hermetically with the possibility of axial movement up.

The dies 16 of the anchor assembly 10 are placed on the hollow rod 13 with the possibility of radial movement outward, in the working position when the hollow rod 13 is moved up relative to the stop 14 and interacts with them from below the wedge pusher 15.

The stop 14 is equipped on the outside with a self-sealing cuff 17, which allows fluid to pass from bottom to top, and is tightly pressed by the collar to the inner walls of the additional casing 1.

From above on an emphasis 14 the load 18 is screwed, provided with radial openings 19.

The hollow rod 13 above the wedge pusher 15 is equipped with through holes 20, bypassing the liquid in the process of lowering and raising the mechanism 8.

Unauthorized fluid flows during the sealing of the device are prevented by the sealing elements 21 and 22.

The device operates as follows:

After examining the casing of the well 23, a packer is lowered into it on the additional casing 1 so that the casing 2 is lower than the disturbances (not shown) in the casing of the well 23. The upper end of the additional casing 1 is sealed and rigidly fixed at the mouth (in Fig. not shown) of the well 23.

After that, into the additional casing 1 on the rope 8 in the transport position (see the figure), the mechanism 7 is lowered until the pusher 9 of the mechanism 7 with the hydraulic cylinder 11 rests on the expanding unit 5, which is determined by the reduction in the weight of the load 18 and the mechanism 7 by an indicator of the weight installed at the wellhead, as well as the sagging of the rope 8.

In the process of lowering the rope 8, equipped at the end with a mechanism 7, the liquid located in the additional casing 1 through the through holes 20 of the hollow rod 13 enters the internal spaces of the hollow rod 13, the hydraulic cylinder 11 under the piston 12, stop 14 and load 18, from where through the radial holes 19 of the load 18 goes again into the additional casing 1, but already above the mechanism 7, in addition, part of the well bore fluid also passes from bottom to top between the collar of the self-sealing cuff 17 and the inner walls of the additional casing Olona 1, thereby avoiding the spout wellbore fluid to the surface during the shutter mechanism 7 in the extra casing 1.

After the pusher 9 of the mechanism 7, the hydraulic cylinder 11 is supported on the expanding node 5, while the emphasis 14 and connected with it using a T-shaped connection

or the dovetail connection of the die 16 under the influence of the weight of the load 18 screwed to the stop 14 from above will move downward relative to the hollow rod 13.

In this case, the wedge pusher 15 of the anchor assembly 10, which is stationary on the hollow stem 13, interacts with the dies 16 of the anchor assembly 10 and presses their gear part to the additional casing 1. As a result, the anchor assembly 10 occupies a working position, fixing it motionless (from moving up and down) the hollow rod 13 relative to the additional casing 1, while the radial holes 19 of the load 18 are combined with the through holes 20 of the hollow rod 13. A hydraulic connection is formed between the internal spaces of the additional integral casing string 1 above the mechanism 7 and the hollow rod 13.

After that, in the additional casing 1 through the pump unit (not shown in Fig.) Create excess pressure, which first pressurizes the collar of the self-sealing collar 17 to the inner walls of the additional casing 1, eliminates the passage of fluid from top to bottom, and then this excess fluid pressure through the hollow rod 13 is transmitted under the piston 12 to the hydraulic cylinder 11, which, due to the fixation of the hollow rod 13 relative to the additional casing 1, moves downward, exerting pressure on the expanding 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 annulus 24 and violations (not shown in the figure) of the well casing 23. After the passage of the nozzle 3, the expanding unit 5 falls to the bottom (in Fig. not shown) of the well. As a result, the pressure inside the additional casing 1 first drops sharply, since there is no support for the hydraulic cylinder 11, and then increases sharply after the hydraulic cylinder 11 abuts the piston 12. The installation of the packer device of the additional pipe string 1 is completed. The pressure in the additional casing 1 is vented.

After that, from the wellhead through the rope 8, the mechanism 7 begins to rise, while the load 18 with the stop 14 and the dies 16 rise upward relative to the hollow rod 13, while the wedge pusher 15 goes out of interaction with the dies 16 of the anchor assembly 10, which in turn exit out of engagement with the additional casing 1 and move radially inward.

The anchor assembly 10 occupies the transport position (see the figure), while the through holes 20 of the hollow rod 13 are lower than the dies 16 of the anchor assembly 10 and the liquid column located in the additional casing 1 above the mechanism 7 rushes through the radial holes 19 of the load 18, through the internal the space of the cargo 18, the stop 14 and the hollow rod 13 through the through holes 20 of the hollow rod 13 down under the mechanism

7, excluding the rise of the liquid column and its spout on the day surface when lifting the mechanism 7 from the additional casing 1.

Since the force created by the hydraulic cylinder 11 during the expansion of the pipe 3 is balanced by the anchor assembly 10, the additional casing 1 does not extend.

The proposed packer device of an additional casing string allows eliminating, having poured out the wellbore fluid onto the day surface, at the wellhead during the descent and lifting of the mechanism into the additional casing string, and also speeds up and simplifies the process of sealing the elastic cuff of the device by lowering the mechanism on the rope.

Claims (1)

A packer of 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 lowered into the additional casing and interacting from above on the expansion assembly, while the expanding assembly is located in the pipe on top and 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 expanding m unit and equipped with a piston and a hollow rod, and the anchor unit is made in the form of an abutment, a wedge pusher, and dies mounted on the hollow rod, while the hollow rod is rigidly connected to the piston, and with the emphasis is hermetically sealed with the possibility of axial upward movement, the anchor dies nodes are placed on the hollow rod with the possibility of radial movement outward when moving the hollow rod upward relative to the stop, characterized in that the mechanism descends into an additional casing on the rope, and the stop is equipped with a self-sealing sleeve outside flowing liquid from bottom to top, with the load screwed up with radial holes from top to top, and the hollow rod above the wedge pusher is equipped with through holes that let the liquid pass during the descent and lifting of the mechanism into an additional casing string, while the wedge pusher interacts with the dies of the anchor unit in working position.