WO2020242319A1 - Method and device to supply a constant, discrete hydraulic volume using a single pressure input cycle - Google Patents

Method and device to supply a constant, discrete hydraulic volume using a single pressure input cycle Download PDF

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Publication number
WO2020242319A1
WO2020242319A1 PCT/NO2020/050131 NO2020050131W WO2020242319A1 WO 2020242319 A1 WO2020242319 A1 WO 2020242319A1 NO 2020050131 W NO2020050131 W NO 2020050131W WO 2020242319 A1 WO2020242319 A1 WO 2020242319A1
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WIPO (PCT)
Prior art keywords
fluid
discharge
chamber
metering
input
Prior art date
Application number
PCT/NO2020/050131
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French (fr)
Inventor
Anthony KENT
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Bossa Nova As
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Publication of WO2020242319A1 publication Critical patent/WO2020242319A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/13—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action using separate dosing chambers of predetermined volume
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/04—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the free-piston type
    • G01F11/06—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the free-piston type with provision for varying the stroke of the piston

Definitions

  • the present invention relates to a metering device for discharging an amount of fluid and a method to supply a constant, discrete hydraulic volume.
  • Balanced hydraulic pistons are the preferred actuation method for interval control valves (ICVs) that are used to allow or prevent flow from compartments of a subterranean reservoir completion.
  • the balanced piston responds to differential pressure in one of two directions. Differential pressure is created by applying pressure from surface to one of two hydraulic conduits, called control lines, that connect to either side of the balanced piston. Due to the geometry of the hydraulic conduits, which can be very long and very small in diameter, it is impossible to control from the input side the volume that exits the downhole side of the conduit when pressure is applied and, as a result, the balanced piston will typically move the full length of travel available. The problem with full length travel is that it provides only two positions for the ICV, full open or full closed.
  • the present invention therefore addresses the problem of providing a discrete hydraulic volume output in response to a single pressure input cycle, regardless of the level of pressure and how much time that pressure input is applied, such that the ICV balanced piston does not receive enough volume to move the full travel available.
  • the present invention allows multiple pressure input cycles, consisting of pressure applied to a minimum system functional threshold followed by relief of said applied pressure, to be provided in order to move the ICV balanced piston in multiple increments from the fully closed to fully open positions.
  • US 2010/0051289 A1 discloses systems for operating one or more sliding sleeve valves in an incremental, step-type fashion between open and closed positions, permitting the valve or valves to be choked to progressively smaller flow areas.
  • the systems also permit the valve or valves to be fully closed without having to progress through incremental steps.
  • WO 2010/019432 A1 discloses a hydraulic fluid metering control module in cooperation with a downhole component.
  • the downhole component is shifted via hydraulic fluid delivered through first and/or second control lines to an actuator of the downhole component.
  • the hydraulic fluid metering control module works in cooperation with the actuator and the control lines to enable shifting of the actuator according to a controlled, incremental process.
  • US6585051 B2 describes a hydraulically operated fluid metering apparatus provides discharge of a known volume of fluid to an actuator of a well tool.
  • US7510013B2 describes a method and system for operating a sliding sleeve valve or other downhole well tool that is axially shiftable among a finite number of increments between two extreme configurations such as open and closed configurations.
  • One object of the invention is to provide a simple and reliable fluid metering device.
  • Another objective is to provide a new design for a fluid metering device to be used to displace a precise volume of fluid each time the fluid metering device is actuated.
  • Yet another object is to provide a new design for a fluid metering device for activating down hole tools by displacing a precise volume of fluid every time the fluid metering device is actuated.
  • Yet another object is to provide a simple and reliable design for a fluid metering device with as few components as possible.
  • Yet another object is to provide a solution for operating an ICV in increments.
  • a metering device for discharging an amount of fluid
  • said metering device comprises a discharge device comprising a discharge cylinder and a discharge piston, said discharge cylinder having a predefined fluid volume being displaced when fluid pressure is applied, and a metering biasing member acting with a biasing force on the discharge piston allowing resetting and refilling of the discharge device with fluid when the force from the fluid pressure is removed.
  • the metering device further comprising a metering check valve preventing flow from the input chamber to the input line, and a recharge device with a recharge shuttle slidable between a first position closing of a fluid connection between an inlet chamber and an outlet chamber of the discharge device and a second position opening up said fluid connection.
  • the recharge shuttle comprises a piston area in fluid connection with the input chamber and a piston area in fluid connection with an input line of the discharge device, and a recharge biasing member is acting with a force on the recharge shuttle in opposite direction of the force from the pressure in the input chamber.
  • the metering device can be connected to an ICV with an actuator.
  • the input line can be connected to a first side of the discharge device and an output line on a second side of the discharge device can be connected to an ICV actuator to open said ICV, wherein the input chamber is connected to said input line, and the output chamber is connected to said output line, wherein the discharge piston is separating said output chamber from said input chamber, and the metering biasing member is acting on said discharge piston with a force in the direction of the input chamber.
  • the metering device can comprise a bypass line with a bypass check valve allowing fluid flow from the output line to the input line.
  • the metering check may further be placed inside the discharge piston, in where the discharge piston can have a T-shape with a small piston area and a large piston area.
  • the invention also relates to a method to supply a constant, discrete hydraulic fluid volume using a metering device, wherein the method comprises the steps of: - applying fluid pressure above a predefined threshold to an input line,
  • Fluid from the output line can be evacuated to the input line by bypassing the metering device through a bypass check valve.
  • the metering device may be connected to an ICV with an actuator, for operation of said ICV.
  • Figure 1 - 4 shows the operation of first embodiment of the invention in sequence.
  • Figure 5-8 shows the operational sequence of a second embodiment of the invention.
  • FIG. 1 shows a first possible embodiment of a metering device 1 according to the invention.
  • the metering device comprises a single input line 2 and a single output line 3, between which lies the functional components of the metering device 1.
  • the output line 3 can be connected to a downhole tool such as an ICV (Inflow Control Valve) or any other downhole tool requiring hydraulic actuation, where fluid output from the output line 3 is discharged into a hydraulic actuator on an ICV or some other downhole tool.
  • ICV Inflow Control Valve
  • the metering device 1 and the method can also be used for several applications where there is a need to supply a dose of a fluid in response to an increase in pressure.
  • Other applications in addition to downhole tools might be compression systems, chemical dosing systems, fluid sampling, combustion system and fluid dispenser for various applications.
  • the metering device 1 comprises a discharge device 13 with a discharge cylinder 14 and a discharge piston 5, said discharge cylinder 14 having a predefined fluid volume being displaced when fluid pressure is applied.
  • a metering biasing member 6 is acting with a biasing force on the discharge piston 5 allowing resetting and refilling of the discharge device 13 with fluid when the force from the fluid pressure is removed.
  • a metering check valve 7 When pressure is applied to the input line 2, a metering check valve 7 allows fluid to pass and the pressure acts against a piston area of a discharge piston 5.
  • the discharge piston 5 moves in the direction of differential pressure and compresses a metering biasing member 6 until the discharge piston 5 bottoms out inside or at an output chamber 4 (Fig 2).
  • the amount of fluid discharged out of the output line 3 is equal to the change in volume of the output chamber 4.
  • the metering check valve 7 closes due to higher pressure in the input chamber 8 compared to that of the input line 2.
  • the input line 2 is connected to a recharge device 12 where it acts on a recharge shuttle 9 with a backpressure.
  • the pressure in the input line 2 is reduced sufficiently the differential pressure across the recharge shuttle 9 is increased so the pressure in the input chamber 8 can overcome the biasing force of a recharge biasing member 10. This will cause the recharge shuttle 9 to compress the recharge biasing member 10 such that the input chamber 8 is then connected to the output line 3 (Fig 3) and allows the metering biasing member 6 to return the discharge piston 5 to the starting position (Fig 4).
  • the output chamber 4 is refilled with fluid from the input chamber 8 as the discharge piston 5 is returned by the metering biasing member 6.
  • the recharge device 12 connects the input chamber 8 to the output chamber 4 when pressure is relieved in the input line 2.
  • the recharge shuttle 9 of the recharge device 12 is slidable between a first position closing of a fluid connection between the inlet chamber 8 and the outlet chamber 4 of the discharge device 13 and a second position opening up said fluid connection.
  • a first piston area of the recharge shuttle 9 is thus in fluid connection with the input chamber 8 and a second piston area is in fluid connection with the input line 2 of the discharge device 13.
  • the recharge biasing member 10 is acting with a force on the recharge shuttle 9 in opposite direction of the force from the pressure in the input chamber 8.
  • An optional bypass line with an optional bypass check valve 11 can be included so that anytime pressure is applied from the output line 3, fluid can bypass the metering device 1 to evacuate into the input line 2.
  • Figure 5 -8 shows a second possible embodiment of the invention where the metering check 7 is placed inside the discharge piston 5.
  • the discharge piston 5 can have a T-shape with a small piston area and a large piston area.
  • the metering check valve 7 allows fluid to flow to the input chamber 8.
  • This embodiment might have an advantage for packaging a compact design.
  • the second embodiment works similar to the first embodiment disclosed in relation to fig. 1-4.
  • the discharge cylinder 14 and the recharge device 12 is not limited to a cylindrical shape, any design that can supply adequate fluid isolation towards a piston or a shuttle and serves the same purpose can be utilized. As an example, for some applications an annular shape can be utilized.
  • the term cylinder is however used for simplicity in both the description and in the claims.
  • metering device is a broad term and can also imply a choke module or part of a choke module.

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  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Metering device (1) for discharging an amount of fluid, said metering device (1) comprises a discharge device (13) comprising a discharge cylinder (14) and a discharge piston (5), said discharge cylinder (14) having a predefined fluid volume being displaced when fluid pressure is applied, and a metering biasing member (6) acting with a biasing force on the discharge piston (5) allowing resetting and refilling of the discharge device (13) with fluid when the force from the fluid pressure is removed, wherein the metering device further comprises a metering check valve (7) and a recharge device (12).

Description

Method and device to supply a constant, discrete hydraulic volume using a single pressure input cycle
Field of the invention
The present invention relates to a metering device for discharging an amount of fluid and a method to supply a constant, discrete hydraulic volume.
Background of the invention
Balanced hydraulic pistons are the preferred actuation method for interval control valves (ICVs) that are used to allow or prevent flow from compartments of a subterranean reservoir completion. The balanced piston responds to differential pressure in one of two directions. Differential pressure is created by applying pressure from surface to one of two hydraulic conduits, called control lines, that connect to either side of the balanced piston. Due to the geometry of the hydraulic conduits, which can be very long and very small in diameter, it is impossible to control from the input side the volume that exits the downhole side of the conduit when pressure is applied and, as a result, the balanced piston will typically move the full length of travel available. The problem with full length travel is that it provides only two positions for the ICV, full open or full closed. In many applications, it has become desirable to have the ICV positioned somewhere between the full open and full closed positions; these incremental positions referred to as a percent (%) of the full open position, where the percent typically refers to the cross-sectional area of the ICV flow ports in the incremental position compared to that of the full open position. The present invention therefore addresses the problem of providing a discrete hydraulic volume output in response to a single pressure input cycle, regardless of the level of pressure and how much time that pressure input is applied, such that the ICV balanced piston does not receive enough volume to move the full travel available. The present invention allows multiple pressure input cycles, consisting of pressure applied to a minimum system functional threshold followed by relief of said applied pressure, to be provided in order to move the ICV balanced piston in multiple increments from the fully closed to fully open positions.
Disclosure of the state of art
US 2010/0051289 A1 discloses systems for operating one or more sliding sleeve valves in an incremental, step-type fashion between open and closed positions, permitting the valve or valves to be choked to progressively smaller flow areas. The systems also permit the valve or valves to be fully closed without having to progress through incremental steps.
WO 2010/019432 A1 discloses a hydraulic fluid metering control module in cooperation with a downhole component. The downhole component is shifted via hydraulic fluid delivered through first and/or second control lines to an actuator of the downhole component. The hydraulic fluid metering control module works in cooperation with the actuator and the control lines to enable shifting of the actuator according to a controlled, incremental process.
US6585051 B2 describes a hydraulically operated fluid metering apparatus provides discharge of a known volume of fluid to an actuator of a well tool.
US7510013B2 describes a method and system for operating a sliding sleeve valve or other downhole well tool that is axially shiftable among a finite number of increments between two extreme configurations such as open and closed configurations.
A disadvantage with found in the prior art is that the solutions and devices comprise a multitude of moving parts and that inherently increases the risk of failure.
Objects of the present invention
One object of the invention is to provide a simple and reliable fluid metering device.
Another objective is to provide a new design for a fluid metering device to be used to displace a precise volume of fluid each time the fluid metering device is actuated.
Yet another object is to provide a new design for a fluid metering device for activating down hole tools by displacing a precise volume of fluid every time the fluid metering device is actuated.
Yet another object is to provide a simple and reliable design for a fluid metering device with as few components as possible.
Yet another object is to provide a solution for operating an ICV in increments. Summary of the invention
At least some or all of the above mentioned objects are solved with a metering device for discharging an amount of fluid, said metering device comprises a discharge device comprising a discharge cylinder and a discharge piston, said discharge cylinder having a predefined fluid volume being displaced when fluid pressure is applied, and a metering biasing member acting with a biasing force on the discharge piston allowing resetting and refilling of the discharge device with fluid when the force from the fluid pressure is removed. The metering device further comprising a metering check valve preventing flow from the input chamber to the input line, and a recharge device with a recharge shuttle slidable between a first position closing of a fluid connection between an inlet chamber and an outlet chamber of the discharge device and a second position opening up said fluid connection. The recharge shuttle comprises a piston area in fluid connection with the input chamber and a piston area in fluid connection with an input line of the discharge device, and a recharge biasing member is acting with a force on the recharge shuttle in opposite direction of the force from the pressure in the input chamber.
The metering device can be connected to an ICV with an actuator.
The input line can be connected to a first side of the discharge device and an output line on a second side of the discharge device can be connected to an ICV actuator to open said ICV, wherein the input chamber is connected to said input line, and the output chamber is connected to said output line, wherein the discharge piston is separating said output chamber from said input chamber, and the metering biasing member is acting on said discharge piston with a force in the direction of the input chamber.
The metering device can comprise a bypass line with a bypass check valve allowing fluid flow from the output line to the input line.
The metering check may further be placed inside the discharge piston, in where the discharge piston can have a T-shape with a small piston area and a large piston area.
The invention also relates to a method to supply a constant, discrete hydraulic fluid volume using a metering device, wherein the method comprises the steps of: - applying fluid pressure above a predefined threshold to an input line,
- filling up an input chamber through a metering check valve on a first side of a discharge piston to move the discharge piston,
- pushing a predefined volume of fluid into an output line from an output chamber on a second side of the discharge piston,
- bleeding of pressure in the input line reliving a backpressure on a recharge shuttle,
- returning the discharge piston,
- moving the recharge shuttle against a recharge biasing member opening up a passage between the input chamber and the output chamber, and
- refilling the output chamber with fluid from the input chamber.
Fluid from the output line can be evacuated to the input line by bypassing the metering device through a bypass check valve.
The metering device may be connected to an ICV with an actuator, for operation of said ICV.
Description of the figures
Embodiments of the present invention will now be described, by way of example only, with reference to the following figures, wherein:
Figure 1 - 4 shows the operation of first embodiment of the invention in sequence.
Figure 5-8 shows the operational sequence of a second embodiment of the invention.
Reference numbers:
1 Metering device
2 Input line
3 Output line
4 Output chamber
5 Discharge piston
6 Metering biasing member
7 Metering check valve
8 Input chamber
9 Recharge shuttle
10 Recharge biasing member
11 Bypass check valve 12 Recharge device
13 Discharge device
14 Discharge cylinder
Description of preferred embodiments of the invention
Figure 1 shows a first possible embodiment of a metering device 1 according to the invention. The metering device comprises a single input line 2 and a single output line 3, between which lies the functional components of the metering device 1.
The output line 3 can be connected to a downhole tool such as an ICV (Inflow Control Valve) or any other downhole tool requiring hydraulic actuation, where fluid output from the output line 3 is discharged into a hydraulic actuator on an ICV or some other downhole tool. The metering device 1 and the method can also be used for several applications where there is a need to supply a dose of a fluid in response to an increase in pressure. Other applications in addition to downhole tools might be compression systems, chemical dosing systems, fluid sampling, combustion system and fluid dispenser for various applications.
The metering device 1 comprises a discharge device 13 with a discharge cylinder 14 and a discharge piston 5, said discharge cylinder 14 having a predefined fluid volume being displaced when fluid pressure is applied. In the discharge cylinder 14 a metering biasing member 6 is acting with a biasing force on the discharge piston 5 allowing resetting and refilling of the discharge device 13 with fluid when the force from the fluid pressure is removed.
When pressure is applied to the input line 2, a metering check valve 7 allows fluid to pass and the pressure acts against a piston area of a discharge piston 5. The discharge piston 5 moves in the direction of differential pressure and compresses a metering biasing member 6 until the discharge piston 5 bottoms out inside or at an output chamber 4 (Fig 2).
The amount of fluid discharged out of the output line 3 is equal to the change in volume of the output chamber 4.
When pressure is relieved from the input line 2, the metering check valve 7 closes due to higher pressure in the input chamber 8 compared to that of the input line 2. The input line 2 is connected to a recharge device 12 where it acts on a recharge shuttle 9 with a backpressure. When the pressure in the input line 2 is reduced sufficiently the differential pressure across the recharge shuttle 9 is increased so the pressure in the input chamber 8 can overcome the biasing force of a recharge biasing member 10. This will cause the recharge shuttle 9 to compress the recharge biasing member 10 such that the input chamber 8 is then connected to the output line 3 (Fig 3) and allows the metering biasing member 6 to return the discharge piston 5 to the starting position (Fig 4).
In other words, the output chamber 4 is refilled with fluid from the input chamber 8 as the discharge piston 5 is returned by the metering biasing member 6. The recharge device 12 connects the input chamber 8 to the output chamber 4 when pressure is relieved in the input line 2.
Hence, the recharge shuttle 9 of the recharge device 12 is slidable between a first position closing of a fluid connection between the inlet chamber 8 and the outlet chamber 4 of the discharge device 13 and a second position opening up said fluid connection. A first piston area of the recharge shuttle 9 is thus in fluid connection with the input chamber 8 and a second piston area is in fluid connection with the input line 2 of the discharge device 13. The recharge biasing member 10 is acting with a force on the recharge shuttle 9 in opposite direction of the force from the pressure in the input chamber 8.
An optional bypass line with an optional bypass check valve 11 can be included so that anytime pressure is applied from the output line 3, fluid can bypass the metering device 1 to evacuate into the input line 2.
Figure 5 -8 shows a second possible embodiment of the invention where the metering check 7 is placed inside the discharge piston 5. In this embodiment the discharge piston 5 can have a T-shape with a small piston area and a large piston area. The metering check valve 7 allows fluid to flow to the input chamber 8. This embodiment might have an advantage for packaging a compact design. The second embodiment works similar to the first embodiment disclosed in relation to fig. 1-4.
The discharge cylinder 14 and the recharge device 12 is not limited to a cylindrical shape, any design that can supply adequate fluid isolation towards a piston or a shuttle and serves the same purpose can be utilized. As an example, for some applications an annular shape can be utilized. The term cylinder is however used for simplicity in both the description and in the claims.
The term metering device is a broad term and can also imply a choke module or part of a choke module.

Claims

Claims
1. Metering device (1) for discharging an amount of fluid, said metering device (1) comprises:
- a discharge device (13) comprising a discharge cylinder (14) and a discharge piston (5), said discharge cylinder (14) having a predefined fluid volume being displaced when fluid pressure is applied,
- a metering biasing member (6) acting with a biasing force on the discharge piston (5) allowing resetting and refilling of the discharge device (13) with fluid when the force from the fluid pressure is removed, characterized in that said metering device (1) further comprises
- a metering check valve (7) preventing flow from the input chamber (8) to the input line (2), and
- a recharge device (12) with a recharge shuttle (9) slidable between a first position closing of a fluid connection between an inlet chamber (8) and an outlet chamber (4) of the discharge device (13) and a second position opening up said fluid connection,
- the recharge shuttle (9) comprises a piston area in fluid connection with the input chamber (8) and a piston area in fluid connection with an input line (2) of the discharge device (13), and
- a recharge biasing member (10) acting with a force on the recharge shuttle (9) in opposite direction of the force from the pressure in the input chamber (8).
2. Metering device (1) according to claim 1 , wherein the metering device (1) is connected to an ICV with an actuator.
3. Metering device (1) according to claim 1 , wherein the input line (2) is connected to a first side of the discharge device (13) and an output line (3) on a second side of the discharge device (13) is connected to an ICV actuator to open said ICV, wherein the input chamber (8) is connected to said input line (2), and the output chamber (4) is connected to said output line (3), wherein the discharge piston (5) is separating said output chamber (4) from said input chamber (8), and the metering biasing member (6) is acting on said discharge piston (5) with a force in the direction of the input chamber (8).
4. Metering device (1) according to claim 1 , wherein the metering device (1) comprises a bypass line with a bypass check valve (11) allowing fluid flow from the output line (3) to the input line (2).
5. Metering device (1) according to claim 1 , wherein the metering check (7) is placed inside the discharge piston (5), said discharge piston (5) having a T-shape with a small piston area and a large piston area.
6. Method to supply a constant, discrete hydraulic fluid volume using a metering device (1), wherein the method comprises the steps of:
- applying fluid pressure above a predefined threshold to an input line (2),
- filling up an input chamber (8) through a metering check valve (7) on a first side of a discharge piston (5) to move the discharge piston (5),
- pushing a predefined volume of fluid into an output line (3) from an output chamber (4) on a second side of the discharge piston (5),
- bleeding of pressure in the input line (2) reliving a backpressure on a recharge shuttle (9),
- returning the discharge piston (5),
- moving the recharge shuttle (9) against a recharge biasing member (10) opening up a passage between the input chamber (8) and the output chamber (4), and
- refilling the output chamber (4) with fluid from the input chamber (8).
7. Method according to claim 6, wherein fluid from the output line (3) is evacuated to the input line (2) by bypassing the metering device (1) through a bypass check valve (11).
8. Method according to claim 6, wherein the metering device (1) is connected to an ICV with an actuator, for operation of said ICV.
PCT/NO2020/050131 2019-05-24 2020-05-20 Method and device to supply a constant, discrete hydraulic volume using a single pressure input cycle WO2020242319A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20190667A NO345081B1 (en) 2019-05-24 2019-05-24 Method and device to supply a constant, discrete hydraulic volume using a single pressure input cycle.
NO20190667 2019-05-24

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US7510013B2 (en) 2006-06-30 2009-03-31 Baker Hughes Incorporated Hydraulic metering valve for operation of downhole tools
WO2010019432A1 (en) 2008-08-15 2010-02-18 Schlumberger Canada Limited System and method for controlling a downhole actuator
US20100051289A1 (en) 2008-08-26 2010-03-04 Baker Hughes Incorporated System for Selective Incremental Closing of a Hydraulic Downhole Choking Valve
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