RU2731447C1 - Y-shaped device for submersible pumping unit - Google Patents

Abstract

FIELD: oil submersible equipment.

SUBSTANCE: invention relates to oil submersible equipment and can be used for operation as part of systems of bypass pumping units as an improved Y-shaped device. Device has two branches on one side, combined by common output in head of Y-unit. To the first branch pipe there is a pump unit with ball type valve placed above it in moving sliding flow bushing. Bypass pipes string is suspended to the second branch. Device is equipped with installed with possibility of rotation clap valve, overlapping second branch. Clap valve has a bar with a protruding end. Protruding end of the plate enters the slot formed on external surface of the bushing, and limits axial movement of the bushing at overlapping by the clap valve of internal channel of the string of bypass pipes. At the output of the Y-unit head there is a centraliser made in the form of an insert bushing with an offset towards the external wall.

EFFECT: invention provides reliability and safety of submersible unit operation and widens its application area.

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Description

The invention relates to oil-submersible equipment and can be used to work as part of bypass systems for submersible pumping units as an improved Y-shaped device (Y-Tool).

In bypass systems for submersible pumping units, the Y-Tool is designed to displace the submersible pumping unit and provide a straight-line passage of a geophysical or other device to the area below the submersible pumping unit.

Submersible pump bypass systems are widely known in which there is a Y-shaped device with two branches. A submersible pumping unit is connected to one of the branches below, the second branch contains a string of bypass pipes, while the string of bypass pipes runs parallel to the submersible pumping unit. To prevent the formation fluid overflow through the bypass pipe string when the submersible pumping unit is operating, the channel to the bypass pipe string is closed with a blind plug.

The disadvantage of these systems is the need, before lowering a geophysical or other device into the area below the submersible pumping unit, to carry out measures to remove the blind plug and to reinstall the blind plug after the completion of the work performed.

There are design solutions that eliminate this drawback, one of such solutions is presented in the patent EP 2088279 A2, which proposes a locking tool that is triggered at a differential pressure, containing a Y-Tool having two branches connected through the Y-block head, and a ball valve designed to block one or the other channel of the Y-Tool against fluid overflow. The first branch is adapted to connect a submersible pumping unit, and the second branch is adapted to provide access to the downhole tool or logging equipment under the specified submersible pumping unit. Said tool further comprises an actuator for displacing the ball valve from contact with one of the branches. The design of the drive is such that when the submersible pumping unit is operating, the fluid pressure below the ball valve will displace the ball from the top of the first arm along the path specified in the Y-Tool to a position on the top of the second arm where it will be held by pressure. liquids. When fluid pressure drops, such as when a submersible pump is turned off, the actuator shifts, displacing the ball away from the top of the second arm, and the ball returns by gravity to a position above the top of the first arm of the Y-Tool.

The disadvantage of the described design is ineffective operation in horizontal wells and wells with a large deviation from the vertical.

The closest analogue of the claimed device (prototype) is a Y-shaped device for a submersible pumping unit, described in patent WO 2017/189431 A1 and including the first and second branches on one side, combined through a common outlet in the Y-block. The first branch is connected to a submersible pumping unit, above which is located a ball-type main valve assembly in a movable sliding flow sleeve, driven by pressure from the submersible pumping unit. A string of bypass pipes with a driven rotary ball valve in the upper part is suspended from the second branch, which controls the flow of liquid into the string of bypass pipes. The main and slave valves are linked by a clutch assembly configured to rotate the rotary ball valve in response to linear movement of the sliding flow sleeve.

The disadvantage of the device is the overlap of the branch channel of the bypass pipe string with a ball valve when the submersible pumping unit is turned on, which does not make it possible to simultaneously lift the formation fluid through two channels without an additional operation of installing a tool that limits the closing of the rotary ball valve. This device uses coiled tubing technology when installing a logging plug. it is necessary to influence the mechanism of opening an alternative channel for the production flow, and this is a limitation on conducting a survey using a geophysical cable.

Another disadvantage of this device is that the ball valve switching elements: the hinge, the lever and the bushing are located outside, which serves as an additional risk of damage to the moving elements and necessitates the use of additional seals between the elements located outside and inside the device.

These disadvantages reduce the reliability and safety of the installation.

The object of the present invention is to provide a reliable and safe in operation Y-shaped device for a submersible pumping station with an extended field of use.

The specified technical result is achieved by the fact that the Y-shaped device for a submersible pumping unit, having two branches on one side, united by a common outlet in the head of the Y-block, to the first branch of which a submersible pumping unit is connected with a ball-type valve located above it in a movable sliding a flow sleeve, and a column of bypass pipes is suspended to the second branch, according to the invention, equipped with a rotatable clapper that overlaps the second branch and contains a bar with a protruding end entering a groove formed on the outer surface of the bushing to limit the axial movement of the latter when overlapping a clapper of the inner channel of the second branch, to which a string of bypass pipes is suspended, while at the outlet in the head there is a centralizer made in the form of a plug-in sleeve with a cylindrical hole displaced towards the outer wall.

In addition, the groove is formed in the upper part of the sleeve and is made trapezoidal with an acute angle in the lower part recessed into the body of the sleeve.

In some embodiments, a pump can be installed in the second branch (string of bypass pipes) for pumping a liquid, which will provide the possibility of simultaneous lifting of formation fluid through two channels.

In some embodiments, a logging equipment or downhole tool on a geophysical wireline may be passed through the second branch.

The mechanism proposed in the Y-shaped device, which closes the channel, is triggered at differential pressure and does not require the release of additional tools to close one of the channels.

In addition, the design of the present invention allows the installation and execution of logging or running a downhole tool on any type of geophysical cable or coiled tubing using appropriate well plugs.

In addition, the mechanism that closes the channel in the inner part of the Y-block interacts directly with the valve connected to the sleeve.

The essence of the invention is illustrated by the following drawings:

FIG. 1 - Y-shaped device in section, arrangement of elements when the submersible pumping unit is turned off.

FIG. 2 - Y-shaped device in section, arrangement of elements when the submersible pumping unit is turned on at the stage of closing the bypass channel with a clapper.

FIG. 3 - Y-shaped device in section, arrangement of elements when the submersible pumping unit is turned on at the stage of opening the channel in the valve.

FIG. 4 - Y-shaped device in section, arrangement of elements when the submersible pumping unit is turned on and the logging plug is installed.

The proposed Y-shaped device contains a Y-block 1, which has two branches on one side, combined into one channel in the head of the Y-block. The first branch is connected to a branch pipe 3 with a spring 7 installed inside and a bushing 4 moving under pressure with a valve 5. In the upper part of the bushing 4 there is a groove 19. A branch pipe 18 is attached to the branch pipe 3, intended for connecting a submersible pumping unit (Figs. 1-4) ...

The main elements of the valve 5 are the ball 12, the seat 14, the sleeve 13, the spring 6. In the inner part of the Y-block 1, a mechanism is installed that closes the channel of the bypass pipe string, which consists of a clapper 8, a cracker body 10, a strip 9 and an axis 15, on which is rotatably mounted on a clapper 8. The clapper 8 can be made in the form of, for example, a disc with a flat protruding part entering the inside of the body 10. parts of the inner surface (passage channel) of the housing 10. It can be convex, have a conical, stepped or other shape that provides tight contact of the contacting surfaces. In the upper part of the bushing 4, a trapezoidal groove 19 is made, in which the free end of the strap 9 is recessed. When the cracker 8 is open, the end of the strap 9 rests on the lower wall of the groove 19, which forms an acute angle in the body of the bushing 4 with the bottom of the groove 19. An installation branch pipe 11, designed to connect the Y-block to the bypass pipe string.

On the side of the head of the Y-block 1, a branch pipe 2 is installed, designed to connect the Y-shaped device with the tubing string. In the inner part of the Y-block 1 at the outlet in the head below the branch pipe 2 there is a centralizer made in the form of a plug-in sleeve 16 (Fig. 4), the axis of the cylindrical hole of which is displaced towards the outer wall of the Y-block 1 and coincides with the axis of the branch pipe 11. Logging plug 17 is located in the nozzle 11 and is designed to seal the channel during logging operations.

The device works as follows.

When the submersible pumping unit is turned off (Fig. 1), the clapper 8 is in the upper (vertical) position, and the passage between the branch pipe 2, the Y-block 1 and the branch pipe 11 is free and forms a through channel, which allows the descent of geophysical or other equipment through it below the first branch, through which the formation fluid is supplied by a submersible pumping unit. This arrangement of the elements allows for fountain production along the second branch.

When you turn on the submersible pumping unit connected to the first branch, in which the valve 5 with the sleeve 4 is installed, the order of operation due to the claimed design can be conditionally divided into two stages.

At the first stage (Fig. 2), a differential pressure is created on the valve 5, which is large on the discharge side of the liquid flow by a submersible pumping unit. Under the influence of pressure, the valve 5, installed in the bushing 4, is displaced in the valve branch pipe 3 towards the clapper 8. The bushing 4, when moved, acts on the bar 9, which is in the groove 19, and rotates the bar 9 together with the clapper 8 mounted on the axis 15, until the cracker 8 comes into contact with the cracker body 10, thereby ensuring the overlap and sealing of the passage channel in the cracker body 10.

At the second stage (Fig. 3) after closing the channel in the cracker body 10 with the cracker 8, the axial movement of the sleeve 4 with the valve 5 is limited by the end of the strap 9, fixed in the groove 19. Under pressure, the ball 12 of the valve 5 presses on the sleeve 13, the spring 6 is compressed, and the ball 12, rising upward, opens the passage for the fluid flow through the internal channels in the valve body 5 and the inner cavity of the sleeve 4.

When the submersible pumping unit is turned off, the pressure drops, the ball 12, under the action of the spring 6, is pressed against the seat 14 of the valve 5, which prevents the liquid from flowing back through the submersible pumping unit. The spring 7 is expanded and the sleeve 4 with the valve 5 return to its original position, moving the plank 9 with the clapper 8 to the position in which the channel in the housing of the clapper 10 is open (Fig. 1).

The proposed design of the Y-shaped device provides the ability to conduct logging operations on any type of geophysical cable or CT, using a well plug corresponding to the type of geophysical cable or CT.

When carrying out work, for example, on a geophysical cable, a logging plug 17 is installed on the geophysical cable above the fixed geophysical equipment or other measuring device. and 11, which further along the string of bypass pipes descends below the submersible pumping unit. The logging plug 17, installed on the same geophysical cable as the geophysical equipment, during descent reaches the nozzle 11, in which the seat is organized, the descent below the seat is limited by the diameter of the logging plug body, which exceeds the diameter of the bore in the nozzle 11.

After the geophysical equipment has been lowered to the depth required for the study, with the logging plug 17 installed, the submersible pumping unit is launched (Fig. 4). When the logging plug 17 is installed, the movement of the sleeve 4 with the valve 5 is limited by the bar 9, so the pressure created by the submersible pumping unit acts on the ball 12 in the valve 5, pressing the spring 6, and opens the flow through the channels in the valve 5 and the inner cavity of the sleeve 4. When When the submersible pumping unit is turned off, the ball 12 under the action of the spring 6 is pressed against the seat 14 of the valve 5, blocking the hole in the valve 5. Upon completion of the logging operations, the cable is lifted with geophysical equipment and a logging plug. To drain the fluid from the tubing pipes into the annulus and equalize the pressure, the logging plug is equipped with a drain mechanism.

Thus, the proposed device provides closure of channels free from fluid flow without additional operations of lowering and lifting of the tool to kill the channels. Due to the possibility of movement of the cracker bar inside the trapezoidal groove, it is possible to reliably fix both the open and closed position of the cracker, which allows the device to work effectively not only in vertical wells, but also in horizontal ones. In addition, the ability of the device to provide lifting of liquid through one of the channels or through two simultaneously opens up a wide range of its application in oil-submersible equipment. In addition, the proposed device is adapted for the use of any types of geophysical cables and coiled tubing during the descent of geophysical or other equipment.

Claims (4)

1. Y-shaped device for submersible installation, having two branches on one side, united by a common outlet in the head of the Y-block, to the first branch of which a pumping unit is connected with a ball-type valve located above it in a movable sliding flow sleeve, suspended from the second branch a string of bypass pipes, characterized in that it is equipped with a rotatably installed clapper that overlaps the second branch and contains a bar with a protruding end entering a groove formed on the outer surface of the sleeve to limit the axial movement of the latter when the clapper closes the inner channel of the string of bypass pipes, and at the outlet in the head there is a centralizer made in the form of a plug-in sleeve with a hole displaced towards the outer wall. 2. Y-shaped device according to claim 1, characterized in that the groove is formed in the upper part of the sleeve and is made trapezoidal with an acute angle in the lower part, recessed into the body of the sleeve. 3. Y-shaped device according to claim 1, characterized in that a pump for pumping liquid is installed in the second branch. 4. Y-shaped device according to claim 1, characterized in that a logging equipment or a downhole tool on a geophysical cable is passed through the second branch.

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