RU2397311C1 - Packer - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: packer consists of hollow shaft, packing element, cone, upper stop, hollow branch, ferrule, oval sockets, guiding pin, position holder of packing element, spring retaining ring in internal circular groove of cone, spring loaded bearing cone, split cone, upper dies, and of additional branch with cone surfaces. A closed shaped slot in form of lengthwise short and long sections connected with a shaped section is made on external surface of the shaft. When the guiding pin travels in the slot up and down at a length exceeding length from an upper edge of the shaped slot to the bottom of the long lengthwise section, the ferrule stays in a transport position, at shorter length the ferrule comes into an operational position. The position holder of the packing element is made as a sleeve with external grooves to interact with a spring ring. The upper dies are connected with the retaining ring by means of plates. In the stop there is made a recess with an additional spring ring; on the additional branch there is positioned a sleeve with external grooves. The hollow branch is equipped with a plug on top. The upper stop is made sectional and consists of a lower part coupled with the packing element, of an upper part tied with the split cone and of a sub.

EFFECT: reliable design of upper retaining unit, ability to reciprocate packer during lowering at freeze-in and reliable and pressure tight packer seating at low efforts.

3 cl, 4 dwg

Description

The invention relates to the oil industry, in particular to devices for separation of the internal space of production casing during operation and repair of the well.

Known packer for injection wells "(patent for PM No. 60604, ЕВВ 33/12, publ. Bulletin No. 03 of January 27, 2007), including a barrel, main cone, stop, sealing element, positional lock of the sealing element, slips, removable assembly characterized in that the removable assembly is made in the form of a nozzle and a sub wound on its upper end, the nozzle being telescopically sealed into the main cone, which is rigidly connected from the bottom to the upper end of the barrel, which is made through, and a closed a groove in the form of longitudinal short and long sections interconnected by a figured section, and the slips are spring-loaded inward and placed in a holder with a guide pin, the holder mounted on the barrel opposite the figured groove, while the guide pin is placed in the figured groove and the holder has the ability to move along the trajectory of the closed figured groove, and on the nozzle a conical surface is made, tapering from top to bottom, while the sealing element is placed on the nozzle and interacts from above with a stop, size mounted on the nozzle, and the stop is fixed relative to the nozzle by a shear element in the transport position, while the positional lock of the sealing element is made in the form of a split cone, tapering from the bottom up, and dies, the split cone being placed under the conical surface of the nozzle and spring loaded radially inwardly a cone mounted below in the inner cylindrical sample made in the upper part of the stop, and the dies are located opposite the conical surface of the pipe and inen down the support ring, which is rigidly fixed in the upper part of the nozzle, while the split cone and the dies have the ability to interact with each other when the axial movement of the nozzle down with the radial movement of the dies outward in the working position, and the nozzle and the stop are equipped with hydraulically interconnected throttle holes.

The closest in technical essence and the achieved result is a packer for injection wells (patent for PM No. 60605, ЕВВ 33/12, publ. Bull. No. 03 of January 27, 2007), including a barrel, main cone, stop, sealing element, position lock a sealing element, slips, a removable assembly, characterized in that the removable assembly is made in the form of a nozzle and a sub that is screwed onto its upper end, the nozzle being telescopically sealed into the main cone, which is rigidly connected to the upper end of the barrel from below bottom, while on the outer surface of the barrel a closed figured groove is made in the form of longitudinal short and long sections interconnected by a figured portion, and the slips are spring-loaded inward and placed in a holder with a guide pin, the holder mounted on the barrel opposite the figured groove, while the guide the pin is placed in a figured groove, and the clip has the ability to move along the trajectory of a closed figured groove, and on the nozzle a conical surface is made, tapering from top to bottom, while the seal the th element is placed on the nozzle and interacts from above with a stop located on the nozzle and a spring retaining ring connected to it, installed in the inner annular groove of the emphasis and fixing the nozzle relative to the emphasis in the transport position, while the spring retaining ring has the possibility of radial expansion outward in the inner the annular groove of the stop during axial movement of the pipe down, and the position lock of the sealing element is made in the form of a split cone located on the pipe, narrowing downward and dies, wherein the split cone is placed under the conical surface of the nozzle and is spring-loaded radially inward by a support cone installed from below in the inner cylindrical selection made in the upper part of the stop, and the dies are located opposite the conical surface of the nozzle and spring-loaded down by the support ring, which rigidly fixed in the upper part of the pipe, and the split cone and the dies have the ability to interact with each other with axial movement of the pipe down with the radial movement of the dies outward in working position.

Both the analogue and the prototype have common disadvantages, namely:

- firstly, jamming during the landing of the upper dies during interaction with the split cone due to the misalignment of the split cone, which is pressed by the spring from below, is possible;

- secondly, the inability to walk the packer while holding it in the well during the descent due to the imperfect design of the figured groove alternating the working position of the cage with the transport when moving the guide pin along the figured groove;

- thirdly, the imperfect design of the position lock of the sealing element, the result of which is a large landing force, as well as wear of the dies, as a result of which incomplete packing (leaky fit) of the packer in the well is possible.

The objective of the invention is to create a reliable design of the upper locking unit, eliminating the jamming of the upper dies in the process of landing and unpacking the packer with the possibility of pacing the packer during descent during tacks by changing the design of the figured groove, as well as a reliable and tight fit of the packer with little effort by improving the position lock sealing element.

The problem is solved by a packer including a hollow barrel, a sealing element located between the main cone and the upper stop on the hollow pipe, which is connected to the stop and telescopically sealed in the main cone, which is rigidly connected from the bottom to the upper end of the barrel, on the outer surface of which is closed figured groove in the form of longitudinal short and long sections, interconnected by a figured section, a clip mounted on the barrel opposite the figured groove, with a spring-loaded slip s and a guide pin located in a figured groove with the ability to move along the trajectory of a closed figured groove together with a clip, a position lock of the sealing element, a coupling, a spring snap ring installed in the inner annular groove, a spring-loaded support cone, a split cone installed in the upper part of the stop with the possibility of radial expansion under the action of the conical surfaces when moving the split cone relative to them upwards, and the upper dies, spring-tightened from the support ring inward and located on top opposite the split cone, moreover, the cone and the upper dies are made with the possibility of interaction with each other when moving the dies down with their radial movement outward to the working position.

New is that the packer is equipped with an additional nozzle with conical surfaces telescopically inserted into the support with a shear screw connected to the top with the coupling and placed on the support ring above the split cone and upper dies, the hollow pipe is rigidly connected to the stop, the shaped groove is made in such a way that when the guide pin moves down and up in it, exceeding the length from the top edge of the figured groove to the bottom of the long longitudinal section, the clip remains in the transport position if earlier, it goes into working, and the inner annular groove with a spring retaining ring is made in the inner cavity of the main cone, the position lock of the sealing element is made in the form of a sleeve put on from below and fixed by a shear element on the nozzle, with outer annular consecutive grooves made with the possibility of interaction with a spring ring when moving the nozzle with the sleeve down relative to the main cone with locking in the extreme position, while the upper dies are connected to the plates with a support ring, from which the spring is drawn inward by means of a support cone interacting with the support dies, the inner ring being seated in an emphasis with an additional spring retaining ring, and a sleeve with an outer ring sequential grooves made by a shear screw and fitted with a shear screw from below with the possibility of interaction with the additional spring ring when moving the additional pipe with sleeve down relative to the stop with fixation in the extreme floor overexposure.

Also new is the fact that the hollow pipe is equipped with a plug that tightly closes its internal cavity.

New also is that the upper emphasis is made of prefabricated, consisting of the lower, interacting with the sealing element, and the upper, interacting with the split cone, parts that are connected by a sub.

Figure 1 shows the upper part of the proposed packer in longitudinal section.

Figure 2 shows the lower part of the proposed packer in longitudinal section.

Figure 3 shows a view A - scan closed figured groove made on the trunk of the packer.

Figure 4 shows a view B of the packer on an enlarged scale.

The packer consists (see FIGS. 1 and 2) of the hollow barrel 1, the sealing element 2, the main cone 3 and the upper stop 4, made of prefabricated, consisting of lower 4 'and upper 4' 'parts connected by a 4' 'sub.

The sealing element 2 is located between the cone 3 and the lower part 4 'of the upper stop 4 on the hollow nozzle 5. The hollow nozzle 5 is telescopically sealed into the cone 3, which is rigidly connected from below to the upper end of the barrel 1. From above, the nozzle 5 is rigidly connected to the lower part 4' top stop 4.

On the outer surface of the barrel 1, a closed figured groove 6 is made in the form of longitudinal short 7 and long 8 sections (see FIGS. 2 and 3), interconnected by a figured section 9. On the barrel 1, a clip 10 with a guide pin is installed opposite the closed figured groove 6 11 and the spring-loaded slips 12. The guide pin 11 is placed in a closed curly groove 6 with the possibility of moving along the trajectory of a closed curly groove 6 together with a clip 10.

The shaped groove 6 is made in such a way that when the guide pin 11 is moved down and up by an amount exceeding the length L, for example 1 (one) meter from the top edge of the closed shaped groove 6 to the bottom of the long longitudinal section 8, the clip 10 remains in the transport position, if less - goes into working.

In the inner cavity of the cone 3 there is an inner annular groove 13 with a spring retaining ring 14.

The position lock of the sealing element 2 is made in the form of a sleeve 15 (see 4), worn from below and fixed by a shear element 16 on the hollow nozzle 5, with outer annular consecutive grooves 17 made with the possibility of interaction with the spring retaining ring 14 when moving the hollow nozzle 5 s sleeve 15 down relative to the main cone 3 with the fixation in the extreme position.

The packer is equipped with an additional pipe 18 with taper surfaces 19 and 20. An additional pipe 18 (see Fig. 1) is telescopically inserted into the upper part 4 '' of the stop 4 with fixation by a shear screw 21, and is connected to the sleeve 22. The upper part 4 '' the upper stop 4 interacts with a split cone 23 (for example, consisting of three segments), placed on an additional pipe 18.

On the additional pipe 18 above the split cone 23 placed the upper dies 24 and the support ring 25.

The upper dies 24 are connected by plates 26 to the support ring 25, from which the spring 27 is pressed inward by means of the support cone 28 interacting with the upper dies 24.

In the upper part 4 '' of the upper stop 4, an inner annular selection 29 is made with an additional spring retaining ring 30, and on the additional nozzle 18 is put on the bottom and fixed with a shear screw 31 of the sleeve 32 with the outer annular consecutive grooves 33 configured to interact with the additional spring retainer the ring 30 when moving the additional pipe 18, and with the sleeve 32 down relative to the upper part 4 "of the upper stop 4 with the fixation in the extreme position.

The coupling 22 by means of an adapter 34 is rigidly connected to the coupling 35.

The hollow pipe 5 (see Fig. 1) is equipped on top with a plug 36 that seals its internal cavity (the plug and hollow pipe 5 are made as a single part). Unauthorized fluid flows are excluded by the sealing elements 37.

The packer works as follows.

At the wellhead (not shown in FIGS. 1, 2 and 3, 4), the guide pin 11 (see FIG. 2) of the cage 10 is installed in the upper part of the longitudinal short section 7 of the closed figured groove 6 made on the outer surface of the barrel 1 (see Fig. 1).

The plug 36 is screwed into the upper end of the hollow nozzle 5. Then the packer is connected, for example, in the form of a rod 38 and connected to the coupling 35 by any known method, for example, a shear screw 39, is attached to the lower end of the tubing string ) (not shown in FIGS. 1, 2 and 3) and lowered into the well.

During the descent of the packer, it is possible to catch it in the well due to the narrowing of the passage section of the production string (not shown in Figs. 1, 2, 3, 4). In this case, it is necessary to raise the packer by an amount exceeding the length L, that is, more than 1 meter, while the movement of the guide pin 11 (see FIGS. 2 and 3) occurs from the upper edge of the figured groove 6 through the figured section 9 to the bottom of the long longitudinal section 8, and then the guide pin 11 enters the lower part of the short longitudinal section of the groove 7, as a result of which the clip 10 remains in the transport position, when the packer is subsequently lowered, the guide pin 11 rises up along the short longitudinal section 7 and occupies the initial polo ix. This allows you to walk the packer (one or more descent - the packer lifts an amount greater than the length L, that is, 1 meter) in case of sticking it in the well during the descent.

Having reached the installation interval of the packer in the well, it is lifted by an amount not exceeding the length L, that is, less than 1 meter, while the movement of the guide pin 11 occurs from the upper edge of the figured groove 6 through the figured section 9 into a long longitudinal section 8, while the guide pin 11 does not fall into the lower part of the short longitudinal section of the groove 7 and upon subsequent lowering of the packer, the guide pin 11 rises up (to the upper part) to the end along the long longitudinal section 8. As a result, the clip 10 occupies the working position set and interacts with their spring-slips 12 initially cone 3 and then with the interior wall of the tower.

As a result, all the details of the packer, with the exception of the parts 10, 11, 12, remaining in place, due to the contact of the spring-loaded slips 12 (see FIGS. 2 and 3) with the inner wall of the production casing, perform a reciprocating movement, while the cone 3, tapering from top to bottom, it enters the spring-loaded slips 12, pushing them outward in the radial direction and pressing their gear part to the inner wall of the production casing (not shown in FIGS. 1, 2 and 3, 4). The tubing string connected to the packer by means of the rod 38 of the planting tool is started to be unloaded onto the packer, which is already fixed on the inner wall of the production string by spring-loaded slips 12, and the sealing element 2 begins to compress.

Partial unloading of the tubing string to the packer is continued (for example, by 5 tons = 50 kN), as a result of which the shear screw 39 is destroyed, while the sealing element 2 continues to be pressed against the inner wall of the production casing of the well.

At the same time, the spring retaining ring 14, located in the inner annular groove 13 of the main cone 3, moves under the influence of the weight of the tubing string along the outer annular consecutive grooves 17 made on the outer surface of the sleeve 15, and the sleeve 15 connected by a shear element 16 with a hollow pipe 5 , moves downward relative to the main cone 3, while fixing the snap ring 14 in the groove 17 of the sleeve 15 in the extreme position.

In this case, from above, the split cone 23 expands radially outward relative to the upper part 4 ″ of the upper stop 4. At a certain moment, the split cone 23 interacts with the upper dies 24, this is due to the conical surface 20 of the additional pipe 18 restricting the movement of the split cone 23 upward relative to additional pipe 18.

Partial unloading of the tubing string to the packer is continued (for example, by 8 tons = 80 kN), while the shear screw 21 is destroyed and under the influence of the weight of the tubing string the additional pipe 18 and all parts located on it above the split cone 23 are moved downward, while due to the interaction of the inverted conical surfaces of the upper dies 24 and the split cone 23, the upper dies 24 radially move outward, which are pressed against the inner wall of the production string by their toothed part.

From moving upward, the upper dies 24 associated with the support ring 25 by the plates 26 are supported by the support cone 28 spring-loaded from the support ring 25 by means of a spring 27.

The conical surface 19 of the additional pipe 18 restricts the movement of the support cone 28 down relative to the additional hollow pipe 18.

At the same time, an additional spring retaining ring 30, located in the inner ring sample 29 of the upper part 4 "of the upper stop 4, is moved by the weight of the tubing string along the outer annular consecutive grooves 33 made on the outer surface of the sleeve 32, while the sleeve 32 connected by a shear screw 31 with an additional pipe 8, moves downward relative to the upper part 4 "of the upper stop 4.

Next, the tubing string is completely unloaded to the packer, while the additional spring retaining ring 30 is fixed in the groove 33 of the sleeve 32 in the extreme position, and the sealing element 2 is fixed in a finally sealed state.

Then the tubing string with the planting tool is removed from the well, and the packer remains in the well, reliably and hermetically separating the column space of the well (plug 36 of the hollow pipe 5 hermetically seals the inner cavity of the packer), after which the planned repair work in the well is carried out.

If it is necessary to remove the packer into the well on the tubing string, a catcher of any known design is lowered with an external gripper under the coupling 35 or the body of the packer adapter 34, for example, an outer tube. The packer is gripped and the tubing string is pulled up, for example, by 10 tons = 100 kN, and the shear screw 31 is destroyed (see FIG. 1).

As a result of the tension of the tubing string, first the coupling 35, the adapter 34, the additional pipe 18 are moved upward relative to the sleeve 32, the upper part 4 ’of the upper stop 4 and the split cone 23, which remain stationary.

In this case, the upper dies 24 depart from the inner wall of the production casing and move radially inward and, due to the movement of the additional pipe 18 upwards, occupy the initial position.

The tension of the tubing string is continued, while the shear screw 16 (see Figs. 2 and 4) is destroyed and the upper part of the packer connected to the sub 4 '' 'of the upper stop 4, as well as the lower part 4' of the upper stop 4 and the hollow pipe 5 are moved upward relative to the sleeve 15 and the main cone 3, while the sealing element 2, compressing radially inward, moves away from the inner wall of the production string, as a result of which the packer is depressurized.

Next, the tubing string with the packer continues to rise, while the barrel 1 rises upward relative to the yoke 10 with a guide pin 11 and spring-loaded slips 12 remaining in place due to their contact with the inner wall of the production string, while the guide pin 11 moves down the long longitudinal section 8 (see figure 2) and falls into the lower part of the short longitudinal groove 7. The tubing string with the packer continues to rise, while the spring-loaded slips 12 (see figure 1) come out of interaction with the main cone 3, and then their gear part out of interaction with the inner wall of the production casing, after which the packer is freely removed to the surface.

In the case of protecting the production casing from high pressure, for example, when pumping fluid through a pipe string (not shown in FIGS. 1, 2, 3) connected to the coupler 35, a plug 36 is not installed in the hollow pipe 5.

The proposed packer has a reliable design of the upper locking unit, which eliminates the jamming of the upper dies in the process of landing and unpacking the packer.

In addition, the improved design of the position lock allows for a reliable and tight seal of the packer with little effort due to the more perfect design of the position lock of the sealing element, and the modified design of the closed figured groove allows the packer to pace when it is stuck during the descent into the well and to prevent complications in the well .

Claims (3)

1. A packer including a hollow barrel, a sealing element located between the main cone and the upper stop on the hollow pipe, which is connected to the stop and telescopically sealed in the main cone, which is rigidly connected from the bottom to the upper end of the barrel, on the outer surface of which a closed figured groove in the form of longitudinal short and long sections interconnected by a figured section, a clip mounted on the barrel opposite the figured groove, with spring-loaded slips and a guide pin, ra placed in a figured groove with the possibility of moving along the trajectory of a closed figured groove together with a holder, a position lock of the sealing element, a coupling, a snap ring installed in the inner ring groove, a spring-loaded support cone, a split cone mounted in the upper part of the stop with the possibility of radial expansion under the action of the conical surfaces when moving the split cone relative to them upwards, and the upper dies, pressed by a spring from the support ring inward and located on top opposite the split cone, and the cone and the upper dies are made to interact with each other when moving the dies down with their radial movement outward to the working position, characterized in that the packer is equipped with an additional nozzle with conical surfaces telescopically inserted into the support with a shear screw connected top with a sleeve, and a support ring placed above the split cone and the upper dies, the hollow pipe is rigidly connected to the stop, the figured groove is made in such a way that when moving When the guide pin is inserted up and down by an amount exceeding the length from the top edge of the figured groove to the bottom of the long longitudinal section of the clip, it remains in the transport position, if less, it goes into working position, and the inner annular groove with a spring retaining ring is made in the inner cavity of the main cone , the position lock of the sealing element is made in the form of a sleeve worn from below and fixed by a shear element on the nozzle, with outer annular consecutive grooves made with the ability to interact with the spring ring when moving the nozzle with the sleeve down relative to the main cone with locking in the extreme position, while the upper dies are connected by plates to the support ring, from which the spring is pressed inward by the support cone interacting with the support dies, and the inner annular sampling with an additional spring retaining ring, and on the additional nozzle from below it is put on and fixed with a shear screw the sleeve with the outer annular consecutive and grooves configured to interact with the additional spring ring when moving the additional nozzle with the sleeve down relative to the stop with fixation in the extreme position. 2. The packer according to claim 1, characterized in that the hollow pipe is equipped with a plug, hermetically overlapping its internal cavity. 3. The packer according to claim 1 or 2, characterized in that the upper stop is prefabricated, consisting of a lower, interacting with a sealing element, and an upper, interacting with a split cone, parts that are connected by a sub.

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