RU2299315C1 - Device for reservoir treatment and collecting reservoir properties retention - Google Patents

Abstract

FIELD: oil and gas production industry, particularly means to isolate reservoirs inside well during reservoir treatment and operation.

SUBSTANCE: device comprises stem with valve installed in lower stem part. Slide valve is inserted in through channel of the stem in air-tight manner. The slide valve is provided with seat for ball receiving. Packer is located in upper stem part. The packer is made as upper and lower self-sealing collars oriented in different directions and fixedly secured to the stem. Annular recess is made in stem below the packer. The annular recess is limited with upper and lower cones arranged from recess top and bottom accordingly. Cup is installed between upper and lower cones so that the cup may perform axial and rotational movement. Cup is provided with finger fixedly arranged in the cup. Upper and lower slips are arranged from cup top and bottom. The slips have corresponding upper and lower centrators spring-loaded against the cup. Upper and lower slips may cooperate with upper and lower cones correspondingly. Outer stem surface has two short slots and one long slot located between the short ones. The slots are adapted to cooperate with finger and serially communicated with each other through figured slots. One figured slot connects bottom of short longitudinal slot, which is formed as transport one, with center of long longitudinal slot, which is made as working one. Another figured slot links long longitudinal slot bottom to center of short longitudinal one arranged in center of long longitudinal slot and is created as removable part. Stem interior has cylindrical recess with pin and spring-loaded bush arranged in the recess. The spring-loaded bush has alternating short and long axial grooves for pin receiving. The grooves are connected with each other so as bush reciprocates with respect to the stem pin serially passes in short and long axial grooves. Slide valve has fishing head arranged over the seat and provided with radial channels. Slide valve bottom is sealed and provided with springing ring and removable thrust, which may cooperate with cylindrical stem recess. Slide valve has rigid thrust located under the removable thrust and cooperating with bush from above. Stem top is connected with pipe string by means of shear member. Pipe stem additionally has case closing the packer from top thereof. Valve is made as a number of radial slide valve orifices located below rigid thrust and adapted to be closed with seat below cylindrical recess in transport position.

EFFECT: extended range of technical capabilities and simplified technology of device usage.

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Description

The invention relates to the oil and gas industry, and in particular to devices for separating formations in a well during their processing and operation.

A device for processing formations in a well is known (see AS SU No. 2234589 IPC 7 Е21В 33/12, publ. BI No. 23 of 08/20/2004), containing a packer including a housing and an elastic sleeve, a disconnector including a trunk and a spool provided with radial channels, while the packer body is made axially through, and the disconnector spool is located inside its trunk, connected to it by shear elements, blanked from below and has a smaller diameter on the outer surface above the blanked section, forming a cavity communicating with the trunk through radial s channels with the interior of the disconnector, is provided with a conical bore in which a stop ring cooperating with an annular groove situated in the bottom of the barrel, and a mounting seat for the ball, in the disposable into the apparatus before processing the second reservoir.

The closest in technical essence is a device for processing formations in a well (see patent for utility model RU No. 36852 IPC 7 ЕВВ 33/12, publ. BI No. 9 of 03/27/2004), containing a packer including a housing and an elastic sleeve , a disconnector, including a barrel equipped with radial channels, and a spool, the packer body being made through and the bottom equipped with a bypass valve, passing from top to bottom, and in the lower part of the body there are radial channels communicating the inside of the packer with a sub-packer space, p In this case, the spool is located inside the packer body and the disconnector barrel and connected to the barrel by shear elements, and the location of the spool is determined by the following relationship:

b≥a + 8 ÷ 10 mm,

where a is the distance from the lower end of the spool to the lower seal of the packer body, mm;

b is the distance from the upper end of the valve to the upper seal of the disconnector barrel, mm.

The spool is made with a landing seat for a ball discharged into the device before processing the second layer.

Both analog and prototype have common disadvantages:

- firstly, limited functionality, since it is impossible to cut off the return fluid in the lower layer;

- secondly, it is impossible to remove the spool from the packer barrel, which is necessary in case of working with two layers, for example, when swabbing (cleaning the layers of reaction products after sequential processing of the layers);

- thirdly, a complex application process associated with dropping the ball from the wellhead and creating additional excess pressure in the pipe string to switch the device to the upper formation, and this requires the involvement of a pumping unit and additional process fluid to fill the pipe string. In addition, the prototype must strictly comply with the above dependencies and structural dimensions, the violation of which can lead the device to an inoperative state.

The objective of the invention is to expand the functionality of the device and simplify the technology of its application.

The problem is solved by a device for processing and preserving the reservoir properties of the formation, containing a pipe string, a disconnector, including a barrel with a valve at the bottom and a spool sealed into its passage channel, equipped with a seating seat for a ball, a packer installed in the upper part of the barrel, a shear element.

New is that the packer is made in the form of two multidirectional self-sealing cuffs rigidly mounted on the barrel, and the pipe string is connected by a shear element to the barrel, below which is additionally equipped with a casing overlapping the packer on top, while below the packer, an annular selection is made limited to the top and from the bottom, respectively, by the upper and lower cones, between which with the possibility of longitudinal and rotational movement a glass equipped with a finger is installed, and on the glass above and below the upper and lower slips equipped with corresponding upper and lower centralizers spring-loaded from the glass and configured to interact with the upper and lower cones, respectively, and on the outer surface of the sleeve for interaction with the finger, two short and one long longitudinal grooves are made between them, serially connected with each other by shaped grooves , one of which connects the bottom of the first of the short longitudinal grooves, which is transport, with the middle of the long longitudinal groove, which is a worker, and the other is the bottom of a long longitudinal groove with the middle of another short longitudinal groove located in the region of the middle of the long longitudinal groove and being a removable unit, while the inside of the barrel is equipped with a cylindrical pin with a pin, inside of which there is a spring-loaded sleeve with alternating short and long axial grooves under a pin connected so that when the sleeve is reciprocated with respect to the barrel, the pin is positioned sequentially in each, with the spool above the seating the saddle is equipped with a fishing head with radial channels, and is sealed from below and equipped with a spring ring and a stall stop, made to interact with the barrel cylindrical selection, and also located below a hard stop, made to interact with the sleeve from above, while the valve is made in the form spool radial holes located below the hard stop and made with the possibility of tight shutoff in the transport position with the barrel below the cylindrical sample.

Figure 1 shows the proposed device in longitudinal section.

Figure 2 shows a scan of the grooves - a.

Figure 3 shows the scan grooves - in.

A device for processing and preserving the reservoir properties of the formation comprises a disconnector 1 (see FIG. 1), including a barrel 2 with a valve 3 at the bottom.

In the bore of the barrel 2, a spool 4 is hermetically inserted, equipped with a seating seat 5 under the ball 6, installed in the landing seat 5 during assembly.

In the upper part of the barrel 1, a packer 7 is installed, made in the form of 2 multidirectional upper and lower self-sealing cuffs mounted rigidly on the barrel 2. An annular sample 8 is made on the barrel 2 below the packer, bounded above and below, respectively, by the upper 9 and lower 10 cones, between which a glass 11 is mounted with the possibility of longitudinal and rotational movement. The glass 11 is equipped with a finger 12 rigidly mounted in it. On the glass 11, the top and bottom the upper 13 and lower 14 slips are installed, equipped with the corresponding upper 15 and lower 16 centralizers, spring-loaded from the cup 11. The upper 13 and lower 14 slips are made with the possibility of interaction with the upper 9 and lower 10 ends, respectively themselves.

On the outer surface of the barrel 2 for interaction with the finger 12 (see FIG. 2), two short 17, 18 and between them one long 19 longitudinal grooves are made, connected in series by curly grooves 20 and 21. A shaped groove 20 connects the bottom of the short longitudinal groove 17, which is transportable, with the middle of the long longitudinal groove 19, which is the working one, and the figured groove 21 is the bottom of the long longitudinal groove 19 with the middle of the short longitudinal groove 18, located in the middle of the long longitudinal groove 19 and which is the removable assembly 22.

The inside of the barrel 2 is equipped with a pin 23 from the bottom 24 with a pin 24, inside of which there is a sleeve 26, spring-loaded upward by means of a spring 25, with alternating short 27 and 28 long axial grooves under the pin 24, connected so that when the sleeve 26 is reciprocated relative to the barrel 2, the pin 24 was located sequentially, then in a short 27, then in a long 28 axial grooves.

The spool 4 above the seat 5 is equipped with a fishing head 29 with radial channels 30, and is drowned from the bottom and equipped with a spring ring 31 and a stall stop 32, configured to interact with the cylindrical selection 23 of the barrel 2, and also located below the hard stop 33, made with the possibility interacting from above with the sleeve 26. The barrel 2 is connected from above by a shear element 34 to the pipe string 35. The pipe string 35 is additionally equipped with a casing 36 overlapping the packer 7 from above.

The valve 3 is made in the form of radial holes 37 of the spool 4, located below the hard stop 33 and made with the possibility of a tight seal in the transport position of the seat 2 below the cylindrical sample 23.

Unauthorized fluid flows are eliminated by o-rings 38, 39.

The device operates as follows.

At the wellhead (not shown in FIGS. 1-3), the finger 12 of the cup 11 is placed in a short longitudinal groove 17 (see FIG. 2) —the transport position, and the pin 24 is installed in a short axial groove 27 (see FIG. 3) , the lower layer is cut off (not shown in Figs. 1-3) - the valve 3 is closed (see Fig. 1), that is, the radial holes 37 of the spool 4 are hermetically closed by the barrel 2 below the cylindrical sample 23.

The device on the pipe string 35 is lowered into the well, while the liquid in the well is passed from bottom to top between the device and the inner walls of the well (not shown in FIGS. 1-3), while the device is centered around the axis of the well by means of the upper 15 and lower 16 centralizers, spring-loaded from the glass 11. The descent of the device is stopped when it is in the interval between two layers.

After that, from the wellhead, the pipe string 35 is lifted to a length greater than the length of the short longitudinal groove 17 (see FIG. 2), and then the pipe string 35 is turned clockwise by a length greater than the scan length of the curly groove 20 connecting the bottom of the short longitudinal groove 17 with the middle of a long longitudinal groove 19, while all the details of the device, since the pipe string 35 (see FIG. 1) is fixed relative to the barrel 2 of the device by means of shear elements 34, perform axial and rotational movements with the exception of parts 11-16, remaining camping on site by contacting the upper 13 and lower slips 14, respectively equipped with upper 15 and lower centralizers 16, by spring-loaded nozzle 11 with the inner walls of the well.

As a result of the operations performed, the finger 12 of the glass 11, which was in the transport position in the short longitudinal groove 17, falls into the middle of the long longitudinal groove 19 (see figure 2), assuming the working position in which the glass 11 is able to axially move relative to the barrel 2 of the device along the long longitudinal groove 19. The upper 13 and lower 14 slips (see figure 1) located on the glass 11 and spring-loaded from the latter by the upper 15 and lower 16 centralizers, are able to interact with the upper cone 9 and the lower them with a cone 10. Continue to pull the pipe string 35 upward, while all the parts of the device rise up, except for the parts 11-16 remaining in place due to the contact of the upper 13 and lower 14 slips with the inner walls of the well.

As a result, the finger 12 is in the lower part of the long longitudinal groove 19 (see figure 2). At a certain moment, the lower slips 14 (see FIG. 1) run into the lower cone 10 with their inner conical surface, as a result of which the lower slips 14 are moved apart and come into contact with the internal walls of the well, centered by lower centralizers 16, spring-loaded from the nozzle 11, and fix the device in the well, while implosion treatment of the lower reservoir is possible if valve 3 is open.

They continue to lift the pipe string 35 and when the estimated fracture load of the shear elements 34 is reached (approximately 50-60 kN, fixed at the wellhead by the weight indicator), the latter are destroyed, as a result of which the pipe string 35, rigidly connected to the casing 36, is released from the barrel 2 of the device and removed to the surface, while the packer 7, made in the form of two multidirectional self-sealing cuffs mounted rigidly on the barrel 2, opens and presses against the inner walls of the well, and the lower slips 14 by means of the lower whisker 10 is compressed against the inner walls of the well.

The device remains in the specified interval and is ready for operation or processing of the upper layer. If the pressure on the device from above (when reagent is injected into the upper layer) exceeds the pressure from below, then the pressure difference is perceived by the upper self-sealing sleeve of the packer 7, since valve 3 is closed. As a result, all the details of the device, except for the parts 11-16 remaining in place, due to the contact of the lower slips 14 with the inner walls of the well, move down the long longitudinal groove 19. As a result, the finger 12 is in the upper part of the long longitudinal groove 19. At a certain point the upper slips 13 with their inner conical surface collide respectively on the upper cone 9 and move apart. As a result, the upper slots 13 come into contact with the walls of the well, are centered by the upper centralizers 15, spring-loaded from the nozzle 11, and fix the device in the well, while the upper self-sealing cuff of the packer 7, which receives pressure from above, is pressed firmly against the walls of the well and holds pressure from above way down.

If necessary, it is possible to process the upper layer (for example, for injecting various reagents into it) (not shown in Figs. 1 and 2), while the penetration of liquid from top to bottom in the lower layer is excluded by ball 6 located in the seat 5 of the spool 4, and packer 7, made in the form of rigidly mounted on the barrel 2 lower and upper multidirectional self-sealing cuffs.

If it is necessary to simultaneously operate the upper and lower layers, it is necessary to open valve 3. For this, a load is lowered into the well on the rope (Figs. 1-3 are not shown), the weight of which is sufficient to compress the spring 25 (for example, 2-3 tubing) , and rest it from above on the fishing head 28 of the spool 4, after which the load is unloaded, which goes down together with the spool 4 and the sleeve 26, to which the load is transferred by means of a hard stop 33, in addition, the sleeve 26 located in the cylindrical selection 23 of the barrel 2 sover AET also rotational movement. As a result, the pin 24 from the short axial groove 27 (see Fig. 3) enters the long axial groove 28 and the valve 3 opens (radial holes 37 of the spool 4 are located below the barrel 2). At the end of the unloading, the cargo is removed from the well to the surface. Now the simultaneous operation of the upper and lower layers is possible. It is also possible implosion treatment of the lower layer through the radial channels 30 of the spool 4, since the valve 3 (see figure 1) is open.

If it is necessary to close the valve 3, the above operation with the descent of the load must be repeated, while the pin 24 from the long axial groove 28 (see Fig. 3) moves to the short axial groove 27 and the valve 3 (see Fig. 1) closes (radial holes 37 the spool 4 is hermetically closed by the barrel 2 below the cylindrical sample 23).

If it is necessary to carry out the simultaneous injection of reagents into both layers, a fishing tool (not shown in Figs. 1 and 2) is lowered into the well on a rope or pipe string and the spool 4 is gripped by the fishing head 29. Stretch the fishing tool upward, while the spool 4 moves upward, and the spring ring 32 located on its outer surface abuts against the top of the sleeve 26 from the inside, and with further movement of the spool 4 acts on the destructible stop 32, cutting off the latter. In this case, the destructible stop 32 lowers down, making room for compression of the spring ring 31, which, being compressed together with the destructible stop, passes the sleeve 26 and slides along the inner surface of the barrel 2 in the compressed state until the spool 4 leaves the barrel 2. Then spool 4 is completely removed from the well. Now the simultaneous injection of reagents into both layers is possible. If necessary, it is possible to install the spool 4 in its original position.

If you need to remove the device into the well on the pipe string, a fishing tool is lowered (for example, a tube with an external grip, not shown in FIGS. 1-3), with which the device is grabbed by the upper part along the outer surface of the barrel 2. After that, the pipe string is lifted with with a fishing tool and a device upward to a length greater than the length of the long longitudinal groove 19 (see FIG. 2), and turn the pipe string clockwise by an amount greater than the scan length of the shaped groove 21. Then lower the pipe string with the fishing tool with a pipe and device down to a length greater than the length of the short longitudinal groove 18.

As a result of the operations performed, the finger 12 from the long longitudinal groove 19 enters the middle of the short longitudinal groove 18 located in the middle of the long longitudinal groove 19 and is a removable assembly 22, while all parts of the device, with the exception of parts 11-16 (see Fig. 1), remaining in place due to the fixation of the upper slips 13 on the inner walls of the well, perform axial and rotational movements.

With the subsequent lifting of the device, the finger 12 enters the removable assembly 22 (see FIG. 2), which excludes the possibility of contact between the upper 13 and lower 14 slips, respectively, with the upper cone 9 and the lower cone 10. Next, the device is removed from the well.

The proposed device has enhanced functionality, allowing you to both process and clean the seams, as well as operate them both simultaneously and separately, while the simplified technological process of using the device makes it possible to avoid unnecessary tripping operations, which means saving financial costs.

Claims (1)

A device for processing and preserving the reservoir properties of the formation, containing a pipe string, a disconnector including a barrel with a valve at the bottom and a spool tightly inserted into its passage channel equipped with a seating seat for a ball, a packer installed in the upper part of the barrel, a shear element, characterized in that the packer is made in the form of two multidirectional self-sealing cuffs mounted rigidly on the barrel, and the pipe string is connected by a shear element to the barrel, below which is additionally equipped with a casing overlapping with on top of the packer, while below the packer on the barrel an annular selection is made, limited by the top and bottom cones, respectively, between which the glass equipped with a finger is installed with the possibility of longitudinal and rotational movement, and the upper and lower slips are equipped on the glass above and below. the corresponding upper and lower centralizers spring-loaded from the glass and made with the possibility of interaction with the upper and lower cones, respectively, and on the outer surface of the sleeve for inter Two short grooves were made with a finger, and one long longitudinal groove between them, connected in series by shaped grooves, one of which connects the bottom of the first of the short longitudinal grooves, which is transport, with the middle of the long longitudinal groove, which is working, and the other, the bottom of the long longitudinal groove with the middle of another short longitudinal groove located in the region of the middle of the long longitudinal groove and being a removable unit, while the barrel is equipped with a cylindrical selection from the inside from the bottom with a sleeve inside which a spring-loaded sleeve is located with alternating short and long axial grooves for the pin, connected so that when the sleeve is reciprocated with respect to the barrel, the pin is positioned in each, and the spool above the seat is equipped with a fishing head with radial channels, and the bottom is drowned and equipped with a spring ring and a stall stop, made with the possibility of interaction with the cylindrical selection of the barrel, as well as located below the hard stop made to cooperate with the sleeve from above, wherein the valve is made in the form of radial holes of the spool, arranged below the fixed stop and adapted to sealingly overlap in transport position below a cylindrical trunk sample.

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