RU52910U1 - PACKING DEVICE - Google Patents

Abstract

The proposal relates to the oil and gas industry, namely, devices for the selective testing of formations in the well.

The packer device consists of a packer containing a housing with a closed figured groove on the outer surface, made in the form of long and short longitudinal grooves connected by a complex closed groove, a slip unit mounted on the housing, consisting of spring-loaded slips and a holder, in which a guide pin is rigidly mounted, Placed in a curly groove. During axial movement of the housing relative to the slip-type assembly, the guide pin alternately moves to a short longitudinal groove — transport position, then to a long longitudinal groove — operating position. On the casing there is a lower support with the possibility of limited axial upward movement, an elastic cuff and an upper support rigidly connected to the casing. A disconnector barrel equipped with radial channels is connected to the upper support of the packer.

The device at a distance above the packer, exceeding the thickness of any of the selectively tested formations, is equipped with an additional packer consisting of lower and upper stops telescopically connected to each other, an additional elastic cuff placed on the outer surface of the lower stop.

The upper emphasis is made in the form of a hydraulic cylinder in which an annular piston is placed. The inner cavity of the hydraulic cylinder is hydraulically connected to the inner space of the tubing string. The lower emphasis from below by means of a coupling is connected to the barrel of the disconnector. The upper emphasis from above by means of an adapter is equipped with an anchor assembly consisting of a cylinder, which is also hydraulically connected to the interior of the tubing string. Anchors are hermetically placed in the cylinder, drawn inwards by means of springs and interacting with the casing under pressure created in the inner space of the tubing string. The material of which the elastic cuff is made is softer than the material of which the additional elastic cuff is made.

The proposed packer device allows you to reliably isolate the test formation both from above and below, and the simplified process of using the packer device allows you to selectively test the required number of formations in one run and thereby reduce the time spent on work, which means saving financial costs.

Description

The proposal relates to the oil and gas industry, namely, devices for the selective testing of formations in the well.

It is known “Device for processing formations in a well” (see patent for utility model No. 37140 IPC 7 E 21 B 33/12, publ. BI No. 10 of 04/10/2004), containing a packer including a housing and an elastic cuff, disconnector including a barrel and a spool provided with radial channels, while the packer body is made in the axial direction through passage, and the spool is installed inside the barrel, while a sleeve is installed on top of the spool equipped with a seating seat for a ball discharged into the device before processing the second layer, and the barrel , golden k and the sleeve are interconnected by differential shear elements, while in the barrel an internal cylindrical selection is made, against which a spool is located, separated by a blank transverse partition, while in the spool body there are two rows of radial channels, one of which is made above the aforementioned blank partition, and another underneath, and before processing the first layer, the upper row of radial channels is opposite the radial channels of the barrel, and before processing the second layer, the upper and lower rows are for The channel channels communicate with each other by means of an internal cylindrical barrel sampling, hydraulically connecting the inner space of the tubing string with the inner space of the packer.

The closest in technical essence and the achieved result is a "Device for processing formations in the well" (see patent RU No. 2234589 IPC 7 E 21 B 33/12, publ. BI No. 23 of 08.20.2004), containing a packer, including case and elastic cuff, disconnector, including the barrel and spool, provided with radial channels, while the packer case is made axially through, and the disconnector spool is located inside its trunk, connected to it by shear elements, sealed from below and has an outer surface above the muffled section m the smaller diameter, which forms a cavity with the barrel communicating through radial channels with the internal space of the disconnector, is equipped with a conical bore in which a retaining ring is installed, interacting with an annular groove located in the lower part of the barrel, and a seat for a ball that is discharged into the device before processing second layer.

Both analog and prototype have common disadvantages:

firstly, the labor-intensive technological process of using the device, since when working with the upper formation it is necessary to seal the wellhead with the help of the wellhead seal or faceplate, while the upper part of the casing stays subject to the pressure created in the string;

secondly, the low functionality of the device, due to the fact that the formation is cut off only on one side (bottom or top), which does not allow you to selectively act on a single layer.

The objective of the utility model is to expand the functionality of the device and simplify the process of its application.

The problem is solved by a packer device containing a packer, comprising a housing with a figured groove on the outer surface and a slit assembly located thereon, rigidly connected to a guide pin, an elastic cuff, a disconnector, including a barrel with radial channels.

What is new is that the case is muffled from the bottom, and the figured groove is closed in the form of a long and short longitudinal grooves interconnected by a complex closed groove, so that with axial movement of the housing relative to the slip-type assembly, the guide pin alternately moves to a short longitudinal groove - transport position , then in a long longitudinal groove - the working position, while the device at a distance above the packer, exceeding the thickness of any of the studied layers, is equipped with an additional packer, a drawer made of telescopically interconnected lower and upper stops, as well as an additional elastic cuff placed on the outer surface of the lower stop, the upper stop being made in the form of a hydraulic cylinder in which an annular piston is placed, the internal cavity of the hydraulic cylinder being hydraulically connected to the inner space of the pump compressor pipes (tubing), while the annular piston has the possibility of axial movement downward relative to the lower stop, compressing an additional elastic cuff, except the upper stop at the top by means of an adapter is equipped with an anchor assembly consisting of a cylinder hydraulically connected to the inner space of the tubing string, while anchors are pressed in the cylinder and interacting with the casing under pressure created in the inner space of the tubing string, the material of which the elastic cuff is made, softer than the material of which the additional elastic cuff is made.

Figure 1 in longitudinal section shows the lower part of the proposed packer device installed under the test formation.

Figure 2 in longitudinal section shows the upper part of the proposed packer device mounted above the test formation.

Figure 3 shows a scan of a closed curly groove made on the packer body.

The packing device consists of a packer 1, comprising a housing 2, with a muffled closed curly groove 3 (Fig. 1) on the outer surface, made in the form of a long 4 (see Fig. 3) and a short 5 longitudinal grooves connected by a complex closed groove 6, and also installed on the housing 2, the slip assembly 7 (see Fig. 1), consisting of spring-loaded slips 8 and the cage 9, in which the guide pin 10 (see Figs. 1 and 3) is rigidly mounted, placed in a closed figured groove 3.

With the axial movement of the housing 2 relative to the slip assembly 7, the guide pin 10 (see FIG. 3) alternately moves to a short longitudinal groove 5 — transport position, then to a long longitudinal groove 4 — operating position.

On the body 2 there is a lower support 11 with the possibility of limited axial upward movement (see FIG. 1), an elastic cuff 12 and an upper support 13, rigidly connected to the housing 2. A disconnector made in the form of a barrel 14 is connected to the upper support 13 of the packer 1 ( see figure 1 and 2), which is equipped with radial channels 15.

The device at a distance above the packer 1, exceeding the thickness of any of the selectively tested formations (not shown in FIGS. 1, 2 and 3), is equipped with an additional packer 16 (see FIG. 2), consisting of the lower 17 and upper 18 stops, telescopically connected between each other, an additional elastic cuff 19, placed on the outer surface of the lower stop 17.

The upper stop 18 is made in the form of a hydraulic cylinder 20, in which an annular piston 21 is placed. The inner cavity 22 of the hydraulic cylinder 20 is hydraulically connected to the inner space of the tubing string 23. The annular piston 21 has the possibility of axial movement downward relative to the lower stop 17, compressing an additional elastic sleeve 19.

The lower stop 17 from below by means of a clutch 24 is connected to the barrel 14 of the disconnector. The upper stop 18 in the working position has the possibility of axial movement downward relative to the lower stop 17, while compressing the additional elastic cuff 19.

The upper stop 18 from above by means of an adapter 25 is equipped with an anchor assembly 26, consisting of a cylinder 27, which is also hydraulically connected to the inner space

tubing string 23. In the cylinder 27, the armature 28 is sealed, drawn inwardly by means of springs 29, and interacting with the casing string (not shown in FIGS. 1, 2 and 3) under the pressure generated in the inner space of the tubing string 23.

Unauthorized fluid flows are prevented by sealing elements 30 and 31.

The device operates as follows.

Before the device is lowered into the well, the guide pin 10 (see FIG. 3) is installed in a short longitudinal groove 5 of the closed figured groove 3 — transport position.

The device in assembled form on the tubing string 23 (see figure 2) is lowered into the well to the required depth and set so that the lower part of the device is 3-5 meters below the formation and the upper part is above the formation at the same distance.

Then the device by means of the tubing string 23 (see FIG. 2) is lifted approximately 1 meter up, as a result of which the guide pin 10 (see FIG. 3), which is in the transport position in the upper part of the short longitudinal groove 5 of the closed figure groove 3, is the contact of the spring-loaded slips 8 of the slip assembly 7 (see Fig. 1) with the inner walls of the casing, moves down the short longitudinal groove 5 and falls into the lower part of the long longitudinal groove 4 of the closed figured groove 3 (see Fig. 3) - operating position while a slip The marketing unit 7 is in a fixed position, and the housing 2 of the packer 1 (see Fig. 1) moves upward relative to the aforementioned slip-type assembly 7.

Further, the device by means of the tubing string 23 is lowered downward, while the guide pin 10 (see FIG. 3) moves from the bottom of the long longitudinal groove 4 of the closed figured groove 3 to its upper part, and the housing 2 moves downward relative to the slip unit 7 until , while the conical part of the lower support 11 (see Fig. 1) does not abut inside the spring-loaded slips 8 of the slip assembly 7. Under the influence of the weight of the tubing string 23, the spring-loaded slips 8 diverge in the radial direction until their gear part contacts the inner casing walls string, as a result, the device is fixed on the inner walls of the casing.

The tubing string 23 (see Fig. 2) is continued to be unloaded onto the device, while under the influence of the weight of the tubing string 22, transmitted through the spring-loaded slips 8 of the slip unit 7 (see Fig. 1) to the lower support 11, the latter moves upward, compressing the elastic cuff 12 (material of which the elastic cuff is made

12 is softer than the material from which the additional elastic cuff 19 is made), which is supported from above in the upper support 13 of the packer 1, reliably blocking the annular space of the well (not shown in Figs. 1, 2, 3) below the formation, as evidenced by a decrease in weight on the indicator weight (figure 1, 2, 3 not shown) installed on the wellhead.

Next, the tubing string 23 continues to be unloaded, while the upper stop 18, made in the form of a hydraulic cylinder 20, acts on top of the annular piston 21. As a result, the upper stop 18 together with the annular piston 21 fall down relative to the lower stop 17, compressing the additional elastic cuff 19 of the additional packer 16.

An additional elastic cuff 19 under the weight of the tubing string 23 is compressed and reliably pressed against the walls of the casing of the well above the formation, reliably swelling the upper part of the casing and protecting it from high pressures that may occur during processing of the formation.

As a result, the test formation is completely isolated from the annular space of the well both from below and from above.

Then begin the test of the reservoir.

To do this, the fluid in the interior of the tubing string 23, cylinder 27 of the anchor assembly 26, adapter 25, lower stop 17 of the additional packer 16 is pumped into the reservoir through the radial channels 15 of the barrel 14 of the uncoupling device (see FIGS. 1 and 2).

The excess pressure generated in the tubing string 23 (see FIG. 2) during the fluid injection, due to the hydraulic communication of the inner space of the tubing string 23 with the inner space 22 of the hydraulic cylinder 20, acts on the annular piston 22, which dynamically compresses the compressed additional elastic sleeve 19 of the additional packer 16, as well as the excess pressure generated in the tubing string 23, also affects the anchors 28 installed in the cylinder 27, which, depending on the pressure generated during the injection process, compress the springs 29 dense bump into the inner casing wall, the guaranteed excluded axial movement device up or down and sealing device is provided depending on the pressure value.

At the end of the planned work, the device is unpacked. To this end, the tubing string 23 is raised up about 1 meter and lowered.

As a result, when lifting up the load (the weight of the tubing string 23) is removed from the elastic sleeve 12 and the additional elastic sleeve 19, respectively, of the packer 1 and the additional packer 16, and they depart from the inner walls of the casing,

assuming the transport position (initial shape), while the guide pin 10, which is in the working position in the length of the longitudinal groove 4 of the closed figured groove 3 (see Fig. 3), enters the complex closed groove 6, and with the subsequent lowering, the guide pin 10 moves from a complex closed groove 6 to a short longitudinal groove 5, the transport position, while the housing 2 of the packer 1 (see Fig. 1) first rises up relative to the slip assembly 7 in the stationary position due to the contact of its springs venous slips 8 with the inner walls of the casing, and then lowers down.

As a result, the packer is unpacked and can be removed to the surface, or transferred to any other interval for selective testing of the formation.

The proposed packer device allows you to reliably isolate the test formation both from above and below, and the simplified process of using the packer device allows you to selectively test the required number of formations in one run and thereby reduce the time spent on work, which means saving financial costs.

Claims (1)

A packer device comprising a packer comprising a housing with a figured groove on the outer surface and a slit assembly located thereon, rigidly connected to a guide pin, an elastic collar, a disconnector including a barrel with radial channels, characterized in that the case is sealed from below and the figured groove is made closed in the form of a long and short longitudinal grooves interconnected by a complex closed groove, so that with axial movement of the housing relative to the slip-type assembly, the guide pin alternately changes then it is pressed into a short longitudinal groove — transport position, then into a long longitudinal groove — operating position, while the device at a distance above the packer exceeding the thickness of any of the studied layers is equipped with an additional packer consisting of telescopically connected lower and upper stops, and also an additional elastic cuff placed on the outer surface of the lower stop, and the upper stop is made in the form of a hydraulic cylinder in which an annular piston is placed, the inner cavity the hydraulic cylinder is hydraulically connected to the interior of the tubing string, while the annular piston has the ability to axially move downward relative to the lower stop, compressing an additional elastic cuff, in addition, the upper stop from above is equipped with an anchor assembly consisting of a cylinder from the top associated with the inner space of the tubing string, while in the cylinder there are anchors, drawn inward, and interacting with the casing under pressure created in Cored oil space of the tubing, the material of construction of the elastic sleeve, is softer than the material from which is made more flexible cuff.