RU70683U1 - PACKER - Google Patents

Abstract

The proposal relates to the oil industry, namely to downhole devices for multiple interval testing of production casing.

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, which does not pass from top to bottom, under which the support is located. Under the support on the barrel, a pressure sealing element and a cone are sequentially arranged. 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 cage is circumferentially provided with slips spring-loaded inward in the radial direction by means of springs. At the upper end of the barrel, a rigid centralizer is installed, made in the form of an external ring sample. A rod is screwed into the upper end of the barrel, drowned from above and equipped with radial holes, connected to a load having a chamber in the lower part. 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 load from the bottom is equipped with through axial grooves in which the fingers are screwed into the rod. The load has the possibility of axial movement relative to the rod within the axial bore holes, while in the lower position of the load relative to the rod, the radial holes of the sealed rod are blocked by sealing elements, and in the upper position of the load relative to the rod, the radial holes of the rod communicate with the hydraulic chamber of the load.

In the process of removing the packer from the well, the centralizer centers the packer relative to the axis of the production string, reducing the wear of the self-sealing collar, moreover, due to the fact that the centralizer is made in the form of an external annular selection of the barrel, which covers most of the annular section of the production string, the load is significantly reduced (column weight process fluid in the production casing), perceived by the self-sealing cuff.

In addition, the proposed packer allows with a sufficient degree of reliability to perform multiple pressure testing of the production string, due to the possibility of tight shutoff with the outside of the load of the radial holes of the rod. 2 ill. for 1 liter

Description

The proposal relates to the oil industry, namely to a downhole device for multiple interval testing of production casing.

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 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 with 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, slip rings installed in the clip around 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 Channel channels

corresponding to the radial channels of the rod, and at the bottom a conical surface configured to interact 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.

As a result of the practical application of these packers, it was found that both the analog and the prototype have common design flaws:

- firstly, the rapid wear of the self-sealing cuff during tripping operations, since during the lifting process the self-sealing cuff takes up a significant load, because it pulls the weight of the liquid column on it, while it is constantly pressed against the inner wall of the production casing of the well, and this reduces the life of the packer and requires the replacement of a self-sealing cuff;

secondly, the non-return valve is made in the form of a ball, and with repeated pressure testing of the production string, especially in paraffin wells and in wells with sand and mud removal, contamination (sticking of sand, dirt, sludge) of the ball seat is possible and, as a result, leaky crimping. In addition, in the process of landing the packer, the sleeve, rigidly connected to the load, bursts out the self-sealing cuff, as a result of which the latter is pressed against the inner walls of the production casing, while the weight of the load is not always enough to completely and tightly press the self-sealing cuff to the inner wall of the production casing, which also leads to leaky pressure testing. All this reduces the reliability of the packer.

The technical task of the proposed utility model is to reduce the load on the self-sealing cuff during the descent of lifting operations and, as a result, reduce its wear and increase the reliability of the packer.

The technical problem is solved by the proposed packer, including a barrel with a figured groove on the outer surface with axial short and long sections, a support, 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 the figured groove, mounted on the circumference of the cage slips, spring-loaded in the radial direction, a self-sealing cuff mounted on the barrel above the support, as well as a rod with radial holes, enny with a load chamber having a bottom, the long and short axial portions of the groove figure interconnected closed-shaped portion so that the axial reciprocating movement relative to the cage guide barrel

the pin will be located now in the axial short section - transport position, then in the axial long section of the curly groove - working position.

What is new is that a rigid centralizer is installed at the upper end of the barrel, made in the form of an external annular selection, the rod being muffled from above and rigidly connected from the bottom to the barrel, while the load from the bottom is equipped with through axial grooves in which fingers are screwed into the rod, moreover, the load has the possibility of axial movement relative to the rod within the through axial grooves, while in the lower position of the load relative to the rod, the radial holes of the rod are hermetically closed, and in the upper position of the load the stem version communicates with the hydraulic load chamber.

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 that does not pass from top to bottom, under which the support 6 is located (see figure 1). Under the support 6 on the barrel 1, a pressure-tight sealing element 7 and a cone are arranged sequentially. On the barrel 1 below the cone 8, a yoke 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 circumferential equipped with slips 11, spring-loaded inward in the radial direction by means of springs 12. At the upper end of the barrel 1 is installed a rigid centralizer 13, made in the form of an outer ring sample. A rod 14 is screwed into the upper end of the barrel 1, which is muffled from above and equipped with radial holes 15, connected to a load 16 having a chamber 17 in the lower part.

Axial short 3 and long 4 sections of the figured groove 2 are interconnected by a closed figured section 18 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 (see, figure 2) - transport position, then in the axial long section 4 of the figured groove 2 is the working position.

The load 16 (see Fig. 1) is equipped with axial grooves 19 below, in which the fingers 20 are screwed into the rod 14. The mass 16 has the possibility of axial movement relative to the rod 14 within the axial grooves 19, while in the lower position of the load 16 relative to the rod 14, the radial holes 15 of the rod 14 of the sealed are closed by means of sealing elements 21 and 22, and in the upper

the position of the load 16 relative to the rod 14, the radial holes 15 of the rod 14 are in communication with the hydraulic chamber 17 of the load 16.

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.

Next, the packer on the string of tubing (tubing) (not shown in FIGS. 1 and 2) or on the rope 23 (see FIG. 1) is lowered into the well by cable termination 24, and before that the packer is lowered into the well, the load weight is increased 16 by installing between the cable termination 24 and the load 16 - 2-3 tubing pipes (not shown in figures 1 and 2). The descent of the packer on the rope 23 (see Fig. 1) into the production casing (not shown in Figs. 1, 2) continues until the interval where it is necessary to pressure test, while the fluid in the well during the descent of the packer flows freely from the bottom up through the inner space 25 of the barrel 1 and the radial holes 15 of the rod 14 into the outer space above the packer, since the load 16 does not overlap the radial holes 15 of the rod 14, while the finger 20 is abutted in the lower ends of the through axial grooves 19 of the load 16, and the centralizer 13 centers the packer relative to axes ex luatatsionnoy column, reducing wear self-sealing cuff 5.

Having reached the required interval of crimping the production casing, it 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 18 to the lower part of the axial long section 4 of the figured groove 2, and then (during descent) the guide pin 10 moves from the bottom of the axial long section 4 of the figured groove 2 to its upper part. In this case, the packer, with the exception of parts 9, 10, 11 and 12 (see figure 1), which remain stationary due to the contact of the slips 11, spring-loaded springs 12 to the inner walls of the production casing (not shown in figures 1 and 2), relative to parts 9, 10, 11 and 12, 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, radially spring-loaded with their inner surface, come into contact with the cone 8 located on 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 inner wall of the test production string (not shown in Figs. 1 and 2), fixing the barrel 1 motionless.

With further unloading of the packer, the load 16 falls down relative to the rod 14, rigidly screwed into the barrel 1, which remains stationary, while the load 16 by means of sealing elements 21 and 22 hermetically seals the radial holes 15 of the rod 14, and the fingers 20 abut against the upper end of the through axial grooves 19 cargo 16.

Then the wellhead is sealed and with the help of a pump unit (not shown in Figures 1, 2) inside the pressed production string, the pressure is increased to the required pressure, which acts on the self-sealing cuff 5 from above, and the higher the pressure of the production casing, the greater the pressure on the self-sealing cuff 5 and the stronger the self-sealing cuff 5 is pressed against the inner wall of the production casing. Having established the degree of tightness of the production string of pipes, the pressure is relieved and the packer is raised by a rope 23 to a height of about 1 m and lowered.

At the beginning of the lift, only the cable termination 24 with the load 16 rises, and all other parts of the packer remain in place. During the lifting of the load 16, the radial holes 15 of the rod 14 are opened, and the process fluid located above the packer, through the above-mentioned radial holes 15 of the tip 14, rushes into the inner space 25 of the barrel 1, from where it exits into the outer space under the packer.

The lifting of the load 16 continues until the fingers 20 abut against the upper ends of the through axial grooves 19 of the load 16, while the hydraulic chamber 17 of the load 16 communicates with the radial holes 15 of the rod 14, which eliminates the “pistoning” of the load 16 when it is axially moved relative to stock 14.

With the further raising of the packer upward, the load 16 by means of the fingers 20 pulls the rod 14, which, in turn, is rigidly connected to the barrel 1 and causes the latter to move.

The packer through the rope 23 continues to lift up, while the guide pin 10 moves relative to the upward 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 29, and then moves during the descent from the upper part of the closed figure section 29 to the upper part of the axial short section 3 of the figure groove 2, moving the packer from the working position to transport.

In this case, the packer, with the exception of parts 9, 10, 11 and 12 (see FIG. 1), which remain stationary due to the contact of the slips 12 of the cage 9 with the wall of the production string, moves relative to the parts 9, 10, 11 and 12 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 rod 14 through the inner space 25 of the barrel 1 and further into the under-packer space (not shown in Fig.).

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

In the process of removing the packer from the well, the centralizer 13 centers the packer relative to the axis of the production string, reducing the wear of the self-sealing collar 5, moreover, due to the fact that the centralizer 13 is made in the form of an external annular selection of the barrel, which covers most of the annular section of the production string, the load is significantly reduced (weight of the process fluid column in the production casing) perceived by the self-sealing cuff 5.

In addition, the proposed packer allows with a sufficient degree of reliability to perform multiple pressure testing of the production casing due to the possibility of tight overlap outside the radial holes of the rod with the load.

Claims (1)

A packer, including a barrel with a figured groove on the outer surface with axial short and long sections, a support, 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 the figured groove, installed in the clip on its circumferences are radially spring-loaded slips, a self-sealing cuff mounted on the barrel above the support, and also a rod with radial holes connected to a load having a chamber in the lower part moreover, the axial short and long sections of the figured groove are interconnected by a closed figured section so that with the 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 characterized in that a rigid centralizer is installed at the upper end of the barrel, made in the form of an external annular selection, the rod being plugged at the top and rigidly connected to the barrel from below, m the load from the bottom is equipped with through axial grooves in which the fingers are screwed into the rod, and the load has the possibility of axial movement relative to the rod within the through axial grooves, while in the lower position of the load relative to the rod the radial holes of the rod are hermetically closed, and in the upper position of the load radial rod openings communicate with the hydraulic load chamber.