RU2305752C1 - Packer - Google Patents

Abstract

FIELD: oil production, particularly downhole device for repeated pipe string interval pressure testing in well.

SUBSTANCE: packer comprises mandrel 1 with figured slot 2 on outer surface thereof. The figured slot 2 has alternating axial short 3 and long 4 sections. Self-sealing collar 5 is installed in upper mandrel 1 part. Located under the collar 5 is support 6. Sealing member 7 and cone 8 are serially installed on the mandrel 1 under support 6. The sealing member 7 is made as self-sealing collar, which prevents liquid flow in top-down direction. Ferrule 9 with guiding pin 10 is installed on mandrel 1 below cone 8 so that the ferrule 9 may slide in axial direction. Guiding pin 10 is located in slot 2 of mandrel 1. Ferrule 9 is provided with springing centralizers 11 and slips 12 arranged along ferrule periphery. Slips 12 are spring-loaded by means of springing plates 13. Head 14 with weight 15 is fixedly connected to upper end of mandrel 1. Head 14 has radial orifices 16 made in upper part thereof. Cap 17 provided with radial pin 18 is installed over the orifices 16. Weight 15 is made as cup put on head 14 and sealing radial orifices 16 so that the orifices 16 may be opened under downward head 14 movement. Through axial grooves 19 are made on outer surface of weight 15. The grooves are adapted for radial pin 18 of head 14 cap 17 receiving. Radial channels 20, which permanently communicate weight 15 interior 21 with ambient space, are made in weight 15. Lower radial channels 23 are created in mandrel 1.

EFFECT: possibility to perform pressure-testing of pipes in low-diameter springs and decreased costs.

2 dwg

Description

The invention relates to the oil industry, namely to downhole devices for multiple, including interval testing, pipe string in the well.

Known packer device (AS No. 1795080, IPC 7 ЕВВ 33/12, publ. Bull. No. 6 of 02.15.1993), including telescopically mounted relative to each other hollow outer barrel with radial channels and a sealing element and an inner barrel with a seal for overlapping 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 die holder, while it is provided with a hollow head rigidly connected to the upper part of the inner barrel 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, a cuff with a tapered tip mounted movably on the outer barrel with the possibility of interaction with the annular protrusion of the head and stoppers that fix the outer and inner trunks when lowering and raising the packer and the outer barrel with a ram holder during packing, while the outer st the ox is made with windows for stoppers, and the inner barrel and ram holder - with annular grooves for sequential placement of stoppers in them during the descent and lifting of the device and during packing.

Known packer (certificate for utility model No. 29090, IPC 7 ЕВВ 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, rigidly a support 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 camera in the lower part, in communication with the column space of the well through radial holes and with the inner space of the rod through an axial cable a bank covered 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 ЕВВ 33/12, publ. Bull. No. 13 of 05/10/2004), including a barrel with a curly 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 cage with a guide pin, which is placed in a curly groove, slip rings installed in the cage along its circumference, spring-loaded 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 cial channels corresponding radial channels rod, and a tapered bottom surface adapted to engage the inner surface of the self-sealing cuff, wherein an outer diameter greater than the diameter of the sleeve self-sealing collar in the transport position, wherein the shaped 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 a high manufacturing cost and, as a result, the cost of the packer design as a whole;

- secondly, limited functionality, since it is impossible to work the packer 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 hoisting operations with the inner wall of the well, which leads to its rapid wear.

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

The technical problem is solved by the proposed packer, including a barrel with a curly groove on the outer surface with short and long longitudinal sections, a support rigidly connected to the barrel, a sealing element sequentially 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, centralizers and slips installed in a holder around its circumference, spring-loaded respectively outward and inward in the radial direction, self-sealing mange the one mounted on the barrel above the support, the tip rigidly connected to the barrel and the load located on top of the barrel, while the longitudinal short and long sections of the figured groove are connected to each other by a closed figured section so that with axial reciprocating movement of the cage relative to the barrel, the guide pin will be it is located in the short axial section - transport position, then in the long axial section of the curly groove - the working position.

What is new is that the sealing element is made in the form of a self-sealing cuff that does not pass from top to bottom, and the tip is equipped with radial holes on top, above which there is a plug equipped with a radial pin, while the load is made in the form of a glass worn on the tip and hermetically overlapping its radial openings made with the possibility of opening when moving the tip down relative to the load, on the outer surface of which there are made axial grooves under the radial pin of the plug tip, and above the axial bore grooves are made radial channels, constantly communicating the internal space of the cargo with the external space, while the barrel below is equipped with additional cargo, above which the lower radial channels are made on the barrel.

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 figure 1) with a curly groove 2 on the outer surface with alternating axial short 3 (see figure 2) and long 4 sections. On top of the barrel 1 is installed self-sealing cuff 5, under which there is a support 6 (see figure 1). Under the support 6 on the barrel 1, a sealing element 7 is arranged in series, made in the form of a self-sealing cuff that does not pass from top to bottom, and a cone 8. On the barrel 1 below the cone 8, a sleeve 9 with a guide pin 10 is axially movable. The guide pin 10 is located in the aforementioned figured groove 2 of the barrel 1. The yoke 9 is provided around the circumference with spring centralizers 11 and slips 12, spring-loaded respectively outward and inward in the radial direction by means of spring plates 13. To the upper end of the barrel 1 TCR tip 14 is attached with a load 15.

The tip 14 on top is equipped with radial holes 16, above which a plug 17 is made, equipped with a radial pin 18.

The load 15 is made in the form of a glass, worn on the tip 14 and hermetically overlapping its radial holes 16, made with the possibility of opening when moving the tip 14 down relative to the load 15.

On the outer surface of the load 15, axial grooves 19 are made in which a radial pin 18 of the plug 17 of the tip 14 is placed. Above the through axial grooves 19 in the load 15 are radial channels 20, which constantly communicate the inner space 21 of the load 15 with the outer space (in FIG. 1 and 2 not shown). The barrel 1 below is equipped with an additional load 22, above which the lower radial channels 23 are made on the barrel 1.

Axial short 3 (see figure 2) and long 4 sections of the figured groove 2 are interconnected by a closed figured section 24 so that when the axial reciprocating movement of the cage 9 relative to the barrel 1, the guide pin 10 will be located then in the axial short section 3 - transport position, then in the axial long section 4 of the figured groove 2 is the working position.

Unauthorized fluid flows on mating surfaces are excluded by sealing elements 25, 26.

The packer works as follows.

At the wellhead, the guide pin 10 of the cage 9 (see figure 2) is installed in the axial short section 3 of the figured groove 2 - transport position.

Then the packer on the rope 27 (see Fig. 1) is lowered into the pipe string (not shown in Figs. 1 and 2) in the interval where it is necessary to crimp, with the load 15 and additional load 22 located respectively on the upper and lower the end of the barrel 1, counteract the buoyancy force that occurs after the packer is submerged under the liquid level in the pipe string.

During the descent of the packer, spring centralizers 11 of the cage 9, spring-loaded outward, are in constant contact with the walls of the pipe string. The liquid located in the well during the descent of the packer flows freely from the bottom up through the lower radial channels 23 of the barrel 1 into the inner space of the barrel 1 and then through the radial holes 16 of the tip 14 into the outer space above the packer, since the load 15, made in the form of a glass, is not overlaps the radial holes 16 of the tip 14, while the radial pin 18 of the plug 17 of the tip 14 is abutted in the lower ends of the through axial grooves 19 of the load 15.

Having reached the required crimping interval, the pipe string is filled with process fluid. Next, the packer is lifted about 1 meter up and down, as a result of the operation, the guide pin 10 (see Fig. 2) when lifting moves from the upper part of the axial short section 3 to its lower part and then through the lower part of the closed figured section 24 to the lower part of the axial long section 4 of the figured groove 2, and then (when lowering) the guide pin 10 moves from the bottom of the axial long section 4 of the figured groove 2 to its upper part.

At the same time, the packer, with the exception of parts 9, 10, 11, 12 and 13 (see FIG. 1), which remain stationary due to the contact of the spring centralizers 11 of the holder 9 with the walls of the pipe string (not shown in FIGS. 1 and 2), moves relative to parts 9, 10, 11, 12 and 13, first up and then down.

The upward movement of the guide pin 10 from the lower part of the axial long section 4 of the figured groove 2 to its upper part continues until the slips 12 of the cage 9, spring-loaded inward in the radial direction by means of spring plates 13, come into contact with the cone 8, rigidly connected with the barrel 1. After interacting with the cone 8, the slips 12 of the cage 9 under the action of the weight of the packer diverge in the radial direction and are pressed against the walls of the tested pipe string (not shown in Figs. 1 and 2), fixing the barrel 1 motionless. first, the load 15, made in the form of a cup, is lowered down relative to the stubs 17 fixed with a tip 14, rigidly connected to the barrel 1, and the load 15 by means of sealing elements 25 and 26 hermetically seals the radial holes 16, while the radial pin 18 abuts against the upper end of the through axial grooves 19 of the load 15.

Then the well is filled with process fluid and the wellhead is sealed. Using a pump unit (not shown in Figures 1, 2), the pressure inside the pressure-tested pipe string is raised to the required pressure, which acts on the self-sealing sleeve 5 from above, and the higher the pressure of pressure testing the pipe string, the greater the pressure on the self-sealing sleeve 5 and the more it presses it to the walls of the tested pipe string. Self-sealing cuff 7 performs a safety role and eliminates the passage of liquid from top to bottom in case of leaks in the self-sealing cuff 5.

Having established the degree of tightness of the pipe string, the pressure is relieved, and the packer is lifted by a rope 27 to a height of about 1 m and lowered down.

At the same time, only the load 15 rises at the beginning of the lift, and all other parts of the packer remain in place. During the lifting of the load 15, the radial holes 16 of the tip 14 open, the technological fluid above the packer through the aforementioned radial holes 16 of the tip 14 rushes into the barrel 1 and then through the lower radial holes of the barrel 1 goes into the outer space under the packer. The lifting of only one load 15 continues until the radial pin 18 of the plug 17 of the tip 14 abuts against the upper ends of the through axial grooves 19 of the load 15, while the radial channels 20, constantly communicating the inner space 21 of the load 15 with the outer space of the packer, exclude " pistoning of the load 15 during its axial movement relative to the plug 17 with the tip 14.

When the packer is further raised up, the load 15 by means of the radial pin 18 carries along the plug 17 with a tip 14, which in turn is rigidly connected to the barrel 1 and causes the latter to move.

The packer through the rope 27 continues to lift upward, while the guide pin 10 moves relative to the upwardly moving barrel 1 from the upper part of the axial long section 4 of the figured groove 2 (see figure 2) to the upper part of the closed figured section 24, and then moves during the descent from the upper part of the closed figure section 24 to the upper part of the axial short section 3 of the figure groove 2, moving the packer from the working position to the transport one.

In this case, the packer, with the exception of parts 9, 10, 11, 12 and 13 (see FIG. 1), which remain stationary due to the contact of the spring centralizers 11 of the holder 9 with the walls of the pipe string, moves relative to parts 9, 10, 11, 12 and 13 down and then up.

In the process of lifting the packer, the liquid above the packer freely flows from top to bottom through the open radial holes 16 of the tip 14 through the inner space of the barrel 1 and then through the lower radial channels 23 of the barrel 1.

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 the crimping of pipes in small diameter columns, which undoubtedly speeds up the repair process and increases the overall production culture.

Claims (1)

A packer including a barrel with a figured groove on the outer surface with short and long longitudinal sections, a support rigidly connected to the barrel, a sealing element sequentially 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 the figured groove, centralizers and slips installed in a cage along its circumference, spring-loaded respectively outward and inward in the radial direction, a self-sealing cuff mounted on the barrel above the support, is rigidly o the tip connected to the barrel and the load located on top of the barrel, while the longitudinal short and long sections of the figured groove are connected to each other by a closed figured section so that with axial reciprocating movement of the holder relative to the barrel, the guide pin will be located in the short axial section - transport position, then in the long axial section of the figured groove - the working position, characterized in that the sealing element is made in the form of a self-sealing cuff that does not pass from top to bottom, and the tip on top is equipped with radial holes, above which there is a plug equipped with a radial pin, while the load is made in the form of a glass, put on the tip and hermetically overlapping radial holes, made with the possibility of opening when moving the tip down relative to the load on the outer surface of which end-to-end axial grooves under the radial pin of the cap of the tip, moreover, radial channels are made above the end-to-end axial grooves, constantly communicating internal load of the space to the outer space, wherein the bottom of the barrel is equipped with additional weight above which the trunk are made lower radial channels.

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