RU65952U1 - PACKER - Google Patents

Abstract

The proposal relates to the oil industry, namely to a downhole device for multiple interval testing of a pipe string in a well. The packer consists of a barrel with a curly groove on the outer surface with alternating axial short and long sections. A self-sealing cuff is installed on top of the barrel, under which the support is located. Under the support on the barrel, a sealing element is arranged sequentially, made in the form of a self-sealing cuff that does not let the cone pass from top to bottom. On the trunk below the cone with the possibility of axial movement is a clip with a guide pin. The guide pin is located in the aforementioned shaped groove of the barrel. The ring around the circumference is equipped with spring centralizers and slips, respectively spring-loaded outward and inward in the radial direction by means of spring plates. A tip is rigidly attached to the upper end of the barrel. The tip on top is equipped with radial holes, above which a plug is provided, equipped with a radial pin. A glass is installed between the cargo and the tip, provided with a spherical surface mounted on the upper retainer, made on the lower end of the cargo. The glass is put on the tip and hermetically seals its radial holes, made with the possibility of opening when moving the tip down relative to the glass. On the outer surface of the cup, axial grooves are made under the radial pin of the cap of the tip, and above the through axial grooves of the cup, radial channels are made that constantly communicate the inner space of the cup with the outer space. The barrel below is equipped with a lower retainer, above which the lower radial channels are made on the barrel. An additional load is installed in the lower barrel retainer with a spherical surface. The upper and lower latches are provided with slots for spherical surfaces made from the periphery to the center. The load and the additional load have the possibility of deviation relative to the axis of the packer during the descent and ascent. 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, then in the axial short section - transport position, then - in the axial long section of the figured groove - working position.

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 crimping pipes in small diameter columns, thanks to the clamps in which the spherical surfaces of the load and additional loads have the ability to deviate from the axis of the packer, which avoids jamming of the packer in the pipe string during tripping. 2 ill. for 1 liter

Description

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

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 connected with a barrel a support, 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 and slips, spring-loaded in the radial direction, while the packer is equipped with a self-sealing sleeve installed on the barrel above the support and a rigidly connected tip through which a rod is passed, 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 the axial channel Ala, 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 a 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 clip with a guide pin, which is placed in a figured 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 below that interacts with the tip and is connected to a load having a camera in the lower part, communicated with the inner 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 Other channels corresponding

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.

Both analog and 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 it is not possible for the packer to work in columns of a small diameter;

- thirdly, the load is rigidly connected to the packer barrel and does not deviate from the axis of the barrel, which during tripping operations in the well leads to jamming of the packer in the pipe string, due to the contact of the lower end of the packer with the inner walls of the compression string, especially with a large cargo length.

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 with the possibility of deflecting the load relative to the wellbore during the hoisting operations of the packer in the well.

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 located on top of the barrel and the load, while the longitudinal short and long sections of the figured groove are interconnected by a closed figured section so that when the axial reciprocating movement of the cage relative to the barrel, the guide pin it will be located either in the short axial section - the 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 from above is equipped with radial holes, above which there is a plug equipped with a radial pin,

at the same time, a cup is installed between the load and the tip, which is provided on top with a spherical surface mounted in the upper retainer made on the lower end of the load, the cup being put on the tip and hermetically seals its radial openings, which can be opened when the tip moves downward relative to the cup, this on the outer surface of the glass is made through axial grooves under the radial pin of the cap of the tip, and above the through axial grooves of the glass are made radial to shafts that constantly communicate the inner space of the glass with the outer space, while the barrel is equipped with a lower retainer from below, above which lower radial channels are made on the barrel, and an additional load is installed in the lower barrel retainer with a spherical surface, while the upper and lower retainers are provided with slots for a spherical surface made from the periphery to the center, and the load and additional load are able to deviate from the axis of the packer during tripping operations.

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 a 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 sequentially arranged, made in the form of a self-sealing sleeve that does not let the cone 8 pass from top to bottom. 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 shaped groove 2 of the barrel 1. The cage 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 rail a tip 14 is simply attached. The tip 14 is equipped with radial holes 15 above, a plug 16 provided with a radial pin 17. A cup 19 is installed between the load 18 and the tip 14. The cup 19 is provided with a spherical surface 20 mounted on the upper retainer 21 on lower end of the load 18.

The glass 19 is worn on the tip 14 and hermetically seals its radial holes 15, which are made with the possibility of opening when moving the tip 14 down relative to the glass 19. On the outer surface of the glass 19 are made through

axial grooves 22 under the radial pin 14 of the plug 16 of the tip 14, and above the through axial grooves 22 of the cup 19, radial channels 23 are made, constantly communicating the inner space of the cup 24 with the outer space.

The barrel 1 is equipped with a lower retainer 25 at the bottom, above which lower radial channels 26 are made on the barrel 1. An additional load 28 is installed in the lower retainer 25 of the barrel 1 with a spherical surface 27. The upper 21 and lower retainers 25 are provided with slots 29 and 30, respectively, for the spherical surfaces 20 and 27, made from the periphery to the center. The load 18 and the additional load 28 have the possibility of deviation relative to the axis of the packer in the process of lowering and lifting.

Axial short 3 (see Fig. 2) and long 4 sections of the figured groove 2 are interconnected by a closed figured section 31 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 - the working position.

Unauthorized fluid flows on mating surfaces are excluded by sealing elements 32, 33.

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 make the assembly of the packer (see figure 1). To do this, spherical surfaces 20 and 27, respectively, of the cup 19 and the load 28 are installed from above through the slot 29 of the upper retainer 21 and from below through the slot 30 of the lower retainer 25.

Then the packer on the rope 34 (see Fig. 1) is lowered into the compressed pipe string (not shown in Figs. 1, 2) in the interval where it is necessary to pressure test, while the load 18 and the additional load 28 prevent the buoyancy force that occurs after immersion of the packer under the liquid level in the pipe string.

During the descent of the packer, the load 18 and the additional load 28 deviate from the axis of the packer due to the spherical surfaces 20 and 27, which prevents jamming of the packer during the descent, the spring centralizers 11 of the cage 9 spring-loaded outwardly in constant contact with the walls of the pipe string. The liquid located in the well during the descent of the packer freely flows from bottom to top through the lower radial channels 26 of the barrel 1 into the inner space of the barrel 1 and then through the radial holes 15 of the tip 14 into the outer space above the packer, since the cup 19 does not overlap the radial holes 15 of the tip 14, while radial

the pin 17 of the plug 16 of the tip 14 is abutted in the lower ends of the through axial grooves 22 of the glass 19.

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 figure 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 curly section 31 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 are radially spring-loaded inward by means of spring plates 13 that come into contact with the cone 8 which is rigidly connected to 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, 2), fixing the barrel 1 motionless. at the packer’s hands, first the cup 19 with the load 18 is lowered down relative to the stubs 16 fixed with the tip 14 rigidly connected to the barrel 1, while the load 18 by means of sealing elements 32 and 33 hermetically seals the radial holes 15 of the tip 14, while the radial pin 17 abuts against the top end face of through axial grooves 22 cups 19.

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 more pressure is applied to the self-sealing sleeve 5, the more it is pressed self-sealing cuff 5 to the walls of the tested pipe string. The self-sealing cuff 7 performs a safety role and eliminates liquid leakage from top to bottom in case of leakage in the self-sealing cuff 5. Having established the degree of tightness of the pipe string, the pressure is relieved and the packer is raised to a height of about 1 m by the rope 34 and lowered.

At the same time, at the beginning of the lift, only the load 18 with the glass 19 rises, and all other parts of the packer remain in place. In the process of lifting the load 18 with the glass 19, the radial holes 15 of the tip 14 are opened, and the process fluid located above the packer through the aforementioned radial holes 15 of the tip 14 rushes into the barrel 1 and then through the lower radial holes 26 of the barrel 1 goes into the outer space under the packer. The lifting of the load 18 with the cup 19 continues until the radial pin 17 of the plug 16 of the tip 14 abuts against the upper ends of the through axial grooves 22 of the cup 19, while the radial channels 23 constantly communicating the inner space 24 of the cup 19 with the outer space of the packer exclude " pistoning "of the load 18 with the glass 19 during their axial movement relative to the plug 16 with a tip 14.

With the further lifting of the packer upward, the load 18 with the cup 19 by means of a radial pin 17 pulls the plug 16 with the tip 14, which, in turn, is rigidly connected to the barrel 1 and causes the latter to move.

The packer through the rope 34 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 FIG. 2) to the upper part of the closed figured section 31, and then when the descent moves from the upper part of the closed figure section 31 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 15 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, while the load 18 and the additional load 28 due to the spherical surfaces 20 and 28 respectively deviate from the axis of the packer.

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 crimping pipes in small diameter columns, thanks to the clamps in which the spherical surfaces of the load and additional loads have the ability to deviate from the axis of the packer, which avoids jamming of the packer in the pipe string during tripping.

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 the cage along its circumference, spring-loaded respectively outward and inward in the radial direction, self-sealing cuff mounted on the barrel above the support, rigidly o the tip connected to the barrel located on top of the barrel and the load, 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 clip relative to the barrel, the guide pin will be located then 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 a glass is installed between the load and the tip, which is provided with a spherical surface mounted on the upper retainer, made on the lower end of the load, and the glass is put on the tip and hermetically overlaps its radial holes, made with the possibility of opening when moving the tip down relative to the glass, while on the outer surface of the glass made through axial pads under the radial pin of the cap of the tip, and above the through axial grooves of the cup radial channels are made, constantly communicating the inner space of the cup with the outer space, while the barrel is equipped with a lower retainer below, lower radial channels are made on the trunk, with a spherical surface in the lower barrel retainer an additional load is installed, while the upper and lower latches are provided with slots for a spherical surface, made from the periphery to the center, and the load and additional ADDITIONAL load have the possibility of deviation from the axis of the packer during tripping operations.