RU2644806C1 - Device for developing a multiple-zone well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry and can be implemented at operation of multiple-zone wells both for separate and simultaneous production of beds. Device contains a nozzle with holes arranged opposite to each of producing beds pressure tight separated from one another with packers, located inside the nozzle, connected to the pumping equipment and a fitting plugged from the bottom, which is equipped with side openings opposite the openings of the nozzle. Openings of the nozzle are equipped with controlled spring-loaded valves, including a hollow cup, inside which there is a sleeve with a seat, and a ball that is capable of leak-tightly interacting with the seat of the sleeve, excluding the flow of products back into the bed. From above, the fitting is equipped with an additional spring-loaded valve that transmits pressure from the annulus to the inside of the fitting at a pressure greater than the hydrostatic pressure between the mouth and the inlet of the additional valve. Adjustable valve is installed inside the nozzle. Sleeve is provided from the inside with a cylindrical hollow insert, it is inserted into the hollow cup with the possibility of limited radial movement and is spring-loaded in the direction of the fitting. Hollow insert is configured to leak-tightly enter the corresponding side opening of the fitting when it is aligned during the rotation of the fitting with the pumping equipment lowered on the pipes.

EFFECT: technical result consists in simplifying the maintenance and saving the well maintenance time by completely eliminating downhole operations and eliminating the use of complex equipment.

1 cl, 2 dwg

Description

The invention relates to the oil and gas industry and can be used in the development of multilayer wells for both separate and simultaneous production of formations.

A device is known for simultaneously separately operating a multilayer well containing a nozzle with holes (patent RU No. 2334866, IPC ЕВВ 43/14, publ. Bulletin No. 27 of 09/27/2008), placed opposite each of the productive formations, hermetically separated by packers, with on the outside of the nozzle opposite each of its openings there are valves, each of which consists of a body with a side channel, a spring-loaded lower seat, hermetically placed in the body, a guide pin and a ball mounted on the seat, and on of the saddle surface, a closed groove is made, consisting of alternating short and long grooves, and the guide pin is rigidly connected to the housing on one side and placed in a closed saddle groove on the other hand with the possibility of moving along the path of alternating short and long grooves under the action of hydraulic pressure from above, while with the location of the guide pin in the short groove of the closed groove of the seat, the valve is closed, and when the guide pin is placed in the long groove, the valve is closed of the groove seat valve is open.

The disadvantages of the device are the difficulty of adjusting to different valve pressures due to the limited ability to control, since the diameter of the springs is the same, and the stroke must provide work to move at least the length of a long groove, a high probability of jamming of one or more valves when accumulation in the grooves of borehole deposits ( for example, paraffin wax) or rust, a large investment of time during switching, since to close and open the valves it is necessary to disconnect the nozzles from the pumping equipment, and for This requires the use of lifting equipment with depressurization of the mouth and subsequent sealing to adjust the valves.

A device for simultaneous and separate operation of a multilayer well is also known (patent RU No. 2339796, IPC ЕВВ 43/14, ЕВВ 34/06, publ. Bull No. 33 of 11/27/2008), comprising a housing with holes made opposite each reservoir, installed in the housing opposite each of its openings with axial movement, valve sleeves with spring ring retainers and gripping elements, a control mechanism for lowering into the well from the surface and moving valve sleeves to open or close the hole the case, packers, with adjustable valves installed on the outside of the case opposite each of its openings, each adjustable valve consisting of a hollow cup inside which a sleeve with a saddle is placed, and a ball spring-loaded from top to bottom placed on the saddle of the sleeve, while the adjustable valves allow operate the corresponding productive formations when the specified pressure values are exceeded by adjusting the compression force of the ball spring for each adjustable valve separately, while capturing mye valve elements are designed as bushings their lower ends, and an inner diameter of each of the valve plugs decreases downwards.

The disadvantages of the device are the high probability of the impossibility of opening or closing one or more valves when accumulation of borehole deposits (for example, paraffin) or rust in the gripping elements, which reduces their initial diameter unevenly, the high time required for switching, since it is necessary to disconnect the valves to close and open nozzles from pumping equipment, and for this it is necessary to use lifting equipment with depressurization of the mouth and subsequent sealing to adjust the valve new

The closest in technical essence and the achieved result is a device for simultaneous and separate operation of a multilayer well (patent RU No. 2339797, IPC EV 43/14, EV 34/06, publ. Bull No. 33 dated 11/27/2008), containing a pipe with holes, made opposite each of the productive formations, hermetically separated by packers, with adjustable valves installed outside the nozzle opposite each of its openings, each adjustable valve consisting of a hollow cup inside which a sleeve is placed with a seat, and a ball spring-loaded from top to bottom, placed on the saddle of the sleeve, while the control valves make it possible to operate the corresponding productive formations when the specified pressure values are exceeded by adjusting the compression force of the ball spring for each adjustable valve separately, while the nipple plugged from below is placed inside the nozzle equipped with side openings and gates, and the side openings of the nipple are placed opposite the nozzle openings, which must be set to the “open” position "And dampers sealingly mounted against the nozzle holes which must be set to" closed ".

The disadvantages of the device are the high time required for switching, since for closing and opening the valves it is necessary to completely remove the pumping equipment and nipple after depressurization of the mouth, and this requires the use of lifting equipment, reassembly or replacement of the nipple, adjustment of the pumping equipment to a new nipple, lowering the nipple descent of pumping equipment and sealing of the mouth.

The technical objectives of the invention are: simplifying maintenance and saving time when switching valves by eliminating hoisting operations.

Technical problems are solved by a device for the development of a multilayer well containing a nozzle with holes made opposite each of the productive layers, hermetically separated by packers, located inside the nozzle, connected to the pumping equipment and plugged from the bottom with a nipple that is equipped with side holes that are located opposite the nozzle holes moreover, the nozzle openings are equipped with controlled spring-loaded valves, including a hollow glass, inside which a sleeve with a gray scrap, and a ball made with the possibility of tight interaction with the saddle of the sleeve, excluding the flow of products back into the reservoir.

What is new is that the nipple on top is equipped with an additional spring-loaded valve, passing pressure from the annular space into the nipple at a pressure exceeding the hydrostatic pressure between the mouth and the inlet of the additional valve, and an adjustable valve is installed inside the pipe, and the sleeve is equipped with a cylindrical hollow insert, inserted into the hollow the glass with the possibility of limited radial movement and is spring-loaded towards the nipple, while the hollow insert is made with the possibility of hermetically to enter the corresponding lateral opening when the pin alignment during rotation of the pin with the pump equipment on the descent pipes.

In FIG. 1 shows a diagram of a device for developing a multilayer well.

In FIG. 2 shows an enlarged controlled valve in downhole conditions (remote element A, see FIG. 1).

A device for developing a multilayer well includes a pipe 1 (Fig. 1) with holes 2 opposite each opened by perforation 3 of the productive formations 4 and 5, hermetically separated by packers 6, located inside the pipe 1 connected to pumping equipment 7 (shown in FIG. .1 conditionally) and a bottom plugged nipple 8, which is equipped with side openings 9, which are located opposite the openings 2 of the pipe 1. The openings 2 of the pipe 1 are equipped with controlled spring-loaded valves 10, including a hollow glass 11 (FIG. 2), inside of which there is a sleeve 12 with a seat 13, and a ball 14 made with the possibility of tight interaction with the seat 13 of the sleeve 12, excluding the flow of products back into the reservoir 4 (Fig. 1) or 5. The nipple 8 on top is equipped with an additional spring-loaded valve 15 passing pressure from the annular space 16 into the nipple 8 at a pressure exceeding the hydrostatic pressure between the mouth (not shown in Fig. 1) and the inlet 17 of the additional valve 15. An adjustable valve 10 is installed inside the pipe 1. Sleeve 12 (Fig. 2) is equipped with a cylindrical hollow insert 18 from the inside, inserted into the hollow glass 11 with the possibility of limited radial movement and is pressed by the spring 19 towards the nipple 8 (Fig. 1). The hollow insert 18 (Fig. 2) is made with the possibility of hermetically entering the corresponding lateral hole 9 of the nipple 8 when combining during rotation of the nipple 8 (Fig. 1) with pumping equipment 7, lowered into the well 20 on pipes (not shown in Fig. 1 ) Technological elements of the device that do not affect operability are not shown or numbered. The device operates as follows.

After the perforation 3 (Fig. 1) is opened, the productive formations 4 and 5 are lowered into the well 20 by a pipe 1 with a nipple 8, adjusting them so that the insert 18 (Fig. 2) of the sleeve 13 is aligned with the corresponding lateral holes 9 of the nipple 8 alternately or some simultaneously when the nipple 8 (Fig. 1) rotates relative to the nozzle 1. To simplify the adjustment, the nipple 8 (Fig. 2) can be equipped with a stop 21 resting on the hollow cup 11. The space outside the nozzle 1 (Fig. 1) between the perforations 3 of the layers 4 and 5 sealed with packers 6, and between the pipe 1 and the nipple 8 - herm reacting the partially hollow cup 11 (FIG. 2) and the pin hole 8. Further, the tubes 20 are lowered to pumps 7 of any known construction (for example, electric centrifugal pump, sucker rod pump, etc.). From below, the pumping equipment 7 tightly "sits" on the nipple 8 without rotation (for example, by means of a spline connection, a gear connection or a regular prism interacting with reciprocal samples, etc.). The wellhead 20 is sealed, and the pipes of the pumping equipment 7 are sealed for rotation. The pumping equipment 7 is launched and the production of the formation 4 through the perforation 3, the hollow sleeve 12 (Fig. 2), which enters the insert 18 into the side hole 9, enters the nipple 8, from where the pumping equipment 7 (Fig. 1) rises to the surface (not shown in Fig. 1). In case of failure of the pumping equipment 7 or when replacing it, the liquid from the nipple 8 will not be able to crush back into the reservoir 4, since the ball 14 (Fig. 2) will sit in the seat 13, isolating the space behind the pipe 1 (Fig. 1) from the space inside the nipple 8. To isolate the used formation 4 and turn on another formation 5, the pumping equipment 7 is stopped. In the annular space 16 create a pressure exceeding the hydrostatic pressure between the mouth and the inlet 17 of the additional valve 15. The additional valve 15 opens, and the excess pressure acts on the adjustable valve 10. In this case, the ball 14 (Fig. 2) will sit in the seat 13, the pressure, acting on the sleeve 12, compresses the spring 19 and the hollow insert 18 will come out of the side opening 9 of the nipple 8 (usually a pressure of 0.2-0.3 MPa above the opening pressure of the additional valve 15 is sufficient). At this time, pipes with pumping equipment 7 (Fig. 1) and nipple 8 are rotated through an angle of 3 ° -5 °, excluding the return of hollow insert 18 into the same hole 9 of nipple 8. The pressure is released, and the rotation of pipes with pumping equipment 7 and nipple 8 continue until the rotation force begins to increase, which indicates a tight entry of the insert 18 (Fig. 2) of the sleeve 12 under the action of the spring 19 of the next valve 10 into the corresponding hole 9 of the nipple for communication with the formation 5 (Fig. 1) and insulation formation 4. Pumping equipment 7 put into operation and prod The formation 5 through the perforation 3, the hollow sleeve 12 (Fig. 2), which enters the insert 18 into the side hole 9, enters the nipple 8, from where it is raised to the surface by pumping equipment 7 (Fig. 1). If there are more productive formations, the operations of switching valves 10 for communication with their respective formations are carried out in a similar manner. Switching the corresponding valves 10 is carried out with minimal time without attracting lifting equipment, and overpressure can be created using a borehole fluid using a portable pump (not shown), since high productivity is not needed, and pipes with equipment 7 and nipple 8 can be turned with a simple tool (by a mechanism) for rotation at the wellhead 20. The opening force of the additional valve 15 is not less than the hydrostatic pressure between the wellhead 20 and the inlet 17, which eliminates the "suction" through it of liquid or gas from the annular space 16 to the input of the pumping equipment 7 during its operation.

The proposed device for the development of a multilayer well allows switching the valves to simplify maintenance and save time due to the complete elimination of tripping and the use of sophisticated equipment.

Claims (1)

A device for developing a multilayer well, comprising a nozzle with holes made opposite each of the productive layers, hermetically separated by packers, placed inside the nozzle, connected to pumping equipment and a bottom plug that is equipped with side holes that are placed opposite the nozzle holes, the holes being the nozzle is equipped with controlled spring-loaded valves, including a hollow cup, inside of which a sleeve with a seat is placed, and a ball made with the possibility of tight interaction with the seat of the sleeve, excluding the flow of products back into the formation, characterized in that the nipple on top is equipped with an additional spring-loaded valve passing pressure from the annular space into the nipple at a pressure exceeding the hydrostatic pressure between the mouth and the inlet of the additional valve, and an adjustable valve is installed inside pipe, and the sleeve is provided with a cylindrical hollow insert from the inside, inserted into the hollow glass with the possibility of limited radial movement pressure and spring-loaded towards the nipple, while the hollow insert is made with the possibility of hermetically entering the corresponding lateral hole of the nipple when combining during rotation of the nipple with the pumping equipment, drained on the pipes.

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