RU49891U1 - PACKER - Google Patents

Abstract

The proposal relates to the oil industry, namely to downhole devices for multiple interval testing of a pipe string in a well. The packer consists of a barrel with a figured groove on the outer surface with alternating axial short and long sections mounted on the barrel with the possibility of axial movement of the support, the sealing element, and rigidly connected to the barrel in its lower part of the tip. The support and the tip are rigidly interconnected, cut by longitudinal sections along the entire diameter of the sleeve, on which there is a sealing element connected rigidly from below to the tip, while the length - b of the sealing element exceeds half the length - a, of the dissected part of the sleeve (b> a ), and the entire dissected part of the sleeve has a length of 2 × A. On the barrel above the support with the possibility of axial movement is located clips with a guide pin. The guide pin is located in the aforementioned shaped groove of the barrel. The yoke is provided with spring centralizers. A load is attached to the top of the trunk, and an additional load is plugged to the bottom. The axial short and long sections of the figured groove are interconnected by a closed figured section so that with axial reciprocating movement of the cage relative to the barrel, the guide pin will be located: either in the axial short section - transport position, then - in the axial long section of the figured groove - working position. The figured groove between the axial short and long sections in the lower part is equipped with an upward sampling, in which a guide pin is placed when the packer is lowered. The proposed packer has small dimensions and weight, in addition, it is cheap to manufacture, and therefore the cost of the packer is reduced, and the expansion of its functionality allows for pipe crimping in columns of small diameter, which undoubtedly speeds up the process of repair work in wells.

Description

The proposal relates to the oil industry, namely to downhole devices for multiple interval testing of a pipe string in a well.

A packer device is known (copyright certificate No. 1795080 IPC 7 E 21 B 33/12, publ. Bull. No. 6 of 02.15.1993), including a hollow outer barrel with radial channels and a sealing element telescopically mounted relative to each other, and an inner barrel with a seal to overlap the radial channels of the outer trunk, hydraulically communicating the cavity of the inner barrel with spaces above and below the sealing element, and a die with a ram holder, while it is provided with a hollow g rigidly connected to the upper part of the inner barrel casing with radial channels and an annular protrusion on the outer surface, rigidly connected to the ram holder with a calibration channel at the lower end, a check valve that overlaps the lower end of the outer barrel, placed above the sealing element, a cuff with a conical tip mounted movably on the outer barrel with the possibility of interaction with an annular projection of the head and stoppers securing the outer and inner trunks when lowering and raising the packer and the outer barrel with a ram holder during packing while the outer barrel is made with windows for stoppers, and the inner barrel and ram holder with annular grooves for sequential placement of stoppers in them when lowering and raising the device and during packing.

Known packer (certificate for utility model No. 29090 IPC 7 E 21 B 33/12, publ. Bull. No. 12 of 04/27/2003), including a barrel with a curly groove on the outer surface with evenly spaced alternating longitudinal short and long sections, a support rigidly connected to the barrel, a pressurizing sealing element located under it and a cone mounted on the barrel with the possibility of axial movement of the cage and a ring connected to it, a guide pin placed in a figured groove and connected to the ring mounted in the cage along its circumference these are spring loaded springs in the radial direction, while the packer is equipped with a self-sealing sleeve installed on the barrel above the support and a tip rigidly connected to it, through which a rod is made, made with an annular ledge below, interacting with the tip, and radial holes located above the tip, moreover, the rod is connected to a load having a chamber in the lower

parts communicated with the casing space of the well by means of radial holes and with the internal space of the rod by means of an axial channel blocked by a non-return valve, a rope is used as a means for raising and lowering.

The closest in technical essence to the proposed is the packer (patent for utility model No. 37763 IPC 7 E 21 B 33/12, publ. Bull. No. 13 dated 05/10/2004), including a barrel with a figured groove on the outer surface with alternating short and long sections, a support rigidly connected to the barrel, a pressurizing sealing element located under it and a cone mounted on the barrel with the possibility of axial movement of the clip with a guide pin, which is placed in a curly groove, slips installed in the clip around its circumference, spring-loaded in in the opposite direction, a self-sealing cuff mounted on the barrel above the support, a tip rigidly connected to the barrel through which a rod with radial holes located above the tip is passed, the rod being made with an annular ledge at the bottom interacting with the tip and connected to a load having a camera in the lower part, in communication with the internal space of the rod by means of an axial channel blocked by a check valve, and the load is additionally equipped from below with a sleeve rigidly connected to it, having ial channels corresponding to the radial channels of the rod, and below the conical surface, made with the possibility of interaction with the inner surface of the self-sealing cuff, while the outer diameter of the sleeve is larger than the diameter of the self-sealing cuff in the transport position, and the figured groove is closed on one side of the outer surface of the barrel.

Devices, both by analogs and by prototype, have common design flaws:

- firstly, the metal consumption and a large number of technologically complex parts leading to high manufacturing costs and, as a consequence, the cost of the packer design as a whole;

- secondly, limited functionality, since the packer cannot operate in columns of a small diameter.

- thirdly, the main working element of the structure, namely the self-sealing cuff, has the possibility of contact during the tripping operations with the inner wall of the well, which leads to its rapid wear.

The technical task of the utility model is to reduce the cost of manufacturing the packer, as well as expanding its functionality, namely, crimping in small diameter columns.

The technical problem is solved by the proposed packer, including a barrel with a curly groove on the outer surface with alternating axial short and long sections, a support, a sealing element, a tip rigidly connected to the barrel, mounted on the barrel with the possibility of axial movement of the clip with a guide pin, which is placed in a curly groove , the load connected from above to the barrel, while the axial short and long sections of the figured groove are interconnected by a closed figured section so that with an axial reciprocating post atelnom moving the holder relative to the barrel, the guide pin is located in the axial short section - transport position, then - in the axial length of the section of figure groove - working position.

What is new is that the cage is provided with circumferential springs around the circumference and is located on the barrel above the support with the possibility of axial movement, the support and tip being rigidly interconnected, cut along longitudinal sections along the entire diameter with a sleeve on which there is a sealing element connected rigidly from below to the tip while the length of the sealing element exceeds half the length of the dissected part of the liner, and the barrel is drowned from below by an additional load, while the figured groove between the axial cor The thin and long sections at the bottom are equipped with an upward sampling, in which the guide pin is placed when the packer is lowered down.

Figure 1 - shows the proposed packer in longitudinal section.

Figure 2 - scan shaped groove made on the outer surface of the barrel.

The packer consists of a barrel 1 (see Fig. 1) with a curly groove 2 on the outer surface with alternating axial short 3 (see Fig. 2) and 4 long sections mounted on the barrel 1 with the possibility of axial movement of the support 5 (see Fig. .1), the sealing element 6 and, rigidly connected to the barrel 1 in its lower part, the tip.

The support 5 and the tip 7 are rigidly interconnected, cut along longitudinal sections along the entire diameter of the sleeve 8, on which the sealing element 6 is located, connected rigidly from the bottom to the tip 7, while the length - b of the sealing element 6 exceeds half the length - a, dissected part 9 of the sleeve 8 (b> a), and the entire dissected part 9 of the sleeve 8 has a length of 2 × a.

On the barrel 1 above the support 5 with the possibility of axial movement of the holder 10 is located with a guide pin 11. The guide pin 11 is placed in the aforementioned

figured groove 2 of the barrel 1. The holder 10 around the circumference is equipped with spring centralizers 12.

A load 13 is attached to the top of the barrel 1, and an additional load 14 is plugged to the bottom of the barrel 1.

Axial short 3 and long 4 sections of the figured groove 2 are interconnected by a closed figured section 15 so that when the axial reciprocating movement of the cage 10 relative to the barrel 1, the guide pin 11 will be located: then in the axial short section 3 - transport position, then - in the axial long section 4 of the figured groove - the working position.

Figured groove 2 between the axial short 3 and long 4 sections in the lower part of the closed figure section 15 is equipped with a selection 16 up, in which the guide pin 11 is placed when lowering the packer down.

The packer works as follows.

The packer assembly as shown in figure 1 on the rope 17 is lowered into the pipe string (not shown in the figures) in the interval where it is necessary to pressure test, while the load 13 and the additional load 14 located respectively on the upper and lower ends of the barrel 1 prevent the force that occurs during operation with the packer under the liquid level in the pipe string. The guide pin 11 of the holder 10 in the transport position is located in the sample 16 of the lower part of the closed figured section 15 of the figured groove 2 (see figure 2).

During the descent of the packer, the spring centralizers 12 of the cage 10 are in constant contact with the walls of the pipe string, and the sealing element 6 (see Fig. 1) is adjacent to the outer surface of the sleeve 8, so that the sealing element 6 does not come into contact with the walls of the pipe string during descent lifting operations (STR), and the liquid in the pipe string during (STR) freely flows through the packer. Having reached the required crimping interval, the pipe string is filled with process fluid.

After that, the packer is lifted about 0.5 meters up and down, as a result of the operation, the guide pin 11 moves (when lifting) from the sample 16 of the lower part of the closed figure section 15 of the figure groove 2 to the lower part of the axial short section 3, and then (when descent) the guide pin 11 is moved from the lower part of the axial short section 3 of the figured groove 2 to the upper part of the axial long groove 4.

In this case, the packer, with the exception of parts 10, 11 and 12, which remain stationary due to the contact of the spring centralizers 12 of the holder 10 with the walls of the pipe string, moves relative to the parts 10.11 and 12, respectively, up and then down.

Next, begin packing the packer. To this end, the packer through the rope 17 is pulled up by about 2 meters, while the parts 10, 11 and 12 remain in place, and the packer rises. At a certain point, the clip 10 with its lower end 18 will interact with the support 5, which is located on the barrel 1 with the possibility of axial movement and is rigidly connected to the sleeve 8. The rope 17 continues to pull up, and the clip 10, which remains stationary, due to the contact spring centralizers 12 with the walls of the pipe string continues to interact with the support 5, which under the action of the barrel 1, as well as connected with it from above the load 13 and from the bottom of the additional load 14 begins to fall down relative to the barrel 1, while the sleeves 8, having a dissected length of 2 × a, is bent in the center arc, since the lower part of the sealing element 6 and the sleeve 8 are rigidly connected to the tip, which, in turn, is rigidly connected to the barrel 1, and since the length - b of the sealing element 6 exceeds half length - a, the dissected part 9 of the sleeve 8 (b> a), then the sealing element 6 is in contact and pressed against the walls of the pipe string.

Then the wellhead (not shown in the figures) is sealed, while the rope 17 is secured by means of a geophysical elevator (not shown in the figures), by means of which the STR is fixed and the pressure inside the pipe string is raised, which acts on the sealing element 6 and tightly presses it to the walls of the pipe string, and the higher the pressure of the pressure testing of the pipe string, the greater the pressure exerted on the sealing element 6, the more strongly the sealing element 6 is pressed against the walls of the tested pipe string Ub

Having established the degree of tightness of the pipe string, the pressure is released.

If in the future it is necessary to crimp the pipe string above the interval in which the packer is located, the latter is lowered by about 2 m by the rope 17, while the guide pin 11 of the ferrule 10 moves from the bottom of the axial long section 4 of the figured groove 2 (see Fig. 2) in the sample 16 of the lower part of the closed figured portion 15 of the figured groove 2, while the barrel 1 of the packer is lowered down, and the support 5 (see Fig. 1) begins to rise due to the elastic forces with a bent arc during crimping of the dissected part 9 of the sleeve 8, while last, slipped Ku is rigidly connected to the support 5 is rectified, and disposed on an outer surface of the sealing member 6 comes out of contact with the stack of the pipe string. The descent continues and at a certain moment the support 5 stops moving up, as

the sleeve 8 is fully straightened and takes its initial position (see figure 1), after which the support 5 comes out of contact with the lower end 18 of the holder 10, while the barrel continues to fall down, and the parts 10, 11 and 12 continue to remain in place until as long as the guide pin 11 of the holder 10 falls into the sample 16 of the lower part of the closed figured section 15 of the figured groove 2.

If it is necessary to compress the pipe string below the interval in which the packer is located, then the latter, in addition to the descent operation by 2 meters described above, must also be raised up to 5 meters by means of rope 17, while the guide pin 11 is moved from the sample 16 of the lower part of the closed of the shaped portion 15 of the shaped groove 2 to the bottom of the axial short portion 3 of the shaped groove 2, and the packer, with the exception of parts 10, 11 and 12, which remain stationary due to the contact of the spring centralizers 12 of the cage 10 with the walls of the columns us pipes, moves up.

Next, the packer can be moved to another interval of the well for crimping the pipe string or removed to the surface.

The proposed packer has small dimensions and weight, in addition, it is cheap to manufacture, and therefore the cost of the packer is reduced, and the expansion of its functionality allows for pipe crimping in columns of small diameter, which undoubtedly speeds up the process of repair work in wells.

Claims (1)

A packer including a barrel with a figured groove on the outer surface with alternating axial short and long sections, a support, a sealing element, a tip rigidly connected to the barrel, mounted on the barrel with the possibility of axial movement of the clip with a guide pin, which is placed in the figured groove, cargo connected top with the barrel, while the axial short and long sections of the figured groove are interconnected by a closed figured groove so that with axial reciprocating movement of the cage relative to a, the guide pin will be located either in the axial short section — the transport position, or in the axial long section of the figured groove — the working position, characterized in that the cage is provided with circumferential centrators around the circumference and is located on the barrel above the support with the possibility of axial movement, and the support and the tip is rigidly interconnected, cut along longitudinal sections along the entire diameter of the sleeve, on which there is a sealing element connected rigidly from below to the tip, while the length of the seal th element exceeds half the length of a cut portion of the sleeve, wherein the shaft bottom plugged additional weight, the shaped axial groove between short and long portions of the bottom of the sample is equipped with up accommodating the guide pin during the descent down the packer.