WO2017042152A1 - Actionneur de vanne doté d'un dispositif de verrouillage hydraulique - Google Patents
Actionneur de vanne doté d'un dispositif de verrouillage hydraulique Download PDFInfo
- Publication number
- WO2017042152A1 WO2017042152A1 PCT/EP2016/070952 EP2016070952W WO2017042152A1 WO 2017042152 A1 WO2017042152 A1 WO 2017042152A1 EP 2016070952 W EP2016070952 W EP 2016070952W WO 2017042152 A1 WO2017042152 A1 WO 2017042152A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- actuator
- piston
- valve
- flow valve
- flow
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims description 25
- 238000002955 isolation Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009844 basic oxygen steelmaking Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000012571 Ficus glomerata Nutrition 0.000 description 1
- 244000153665 Ficus glomerata Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/04—Manipulators for underwater operations, e.g. temporarily connected to well heads
-
- 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
- E21B34/066—Valve arrangements for boreholes or wells in wells electrically actuated
-
- 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
- E21B34/02—Valve arrangements for boreholes or wells in well heads
- E21B34/04—Valve arrangements for boreholes or wells in well heads in underwater well heads
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K35/00—Means to prevent accidental or unauthorised actuation
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/03—Valves operated by gear mechanisms, e.g. rack and pinion mechanisms
Definitions
- the present invention relates to actuators, such as actuators which may be used subsea to control a flow or isolation valve.
- actuators such as actuators which may be used subsea to control a flow or isolation valve.
- an actuator may be used to control a valve in a subsea control system such as for a blow-out-preventer, a tree system or a manifold for example.
- Actuators for valves used in the oil and gas industry are preferably 'failsafe-closed' to reduce the likelihood of an uncontrolled release of hydrocarbons in the event of a loss of power or control or in the event a failure for example.
- This failsafe-closed state is generally provided by one or more springs which, in the absence of an opening force, urge the valve into the closed state.
- Hydraulic fluid is generally used to open a valve by pushing back against the spring force.
- the hydraulic fluid is normally supplied from a surface location such as from a platform or a vessel for example via an umbilical.
- the umbilical generally includes several lines for the supply of hydraulic fluid to various subsea actuators.
- the length of the umbilical will depend upon the circumstances, but for a typical subsea installation it could be several hundred metres or tens of kilometres in length. Because of the need to protect the hydraulic lines over the considerable length in hostile and high pressure subsea environments, the umbilical is very expensive and complicated making it liable to failures from leaks for example.
- an actuator for a valve comprising: a piston arranged to be moved between first and second positions; a hydraulic locking mechanism to lock the piston in the first or second position; and an electric motor to move the piston from the first to the second position.
- an electric motor to move the piston from the first to the second position such as to move a flow or isolation valve from a closed to an open position
- the electric motor of our invention may be relatively inexpensively and reliably controlled by an electrical control line such as an electric cable which is less expensive and less prone to failure than a hydraulic line which may suffer from leaks and loss of pressure.
- the electric motor could be a direct drive motor or have a rotary-linear converter to drive the piston back and forth for example.
- the hydraulic locking mechanism could comprise a by-pass conduit connected to each side of the piston with a locking valve in the by-pass conduit to allow fluid to pass therethrough when the piston is to be moved between the first and second positions and to prevent the flow of fluid therethrough when the piston is to be locked in either the first or second position.
- the actuator could be used to actuate any appropriate component such as a flow or isolation valve, such as a bore valve, a balanced valve or a non-balanced valve for example.
- the piston of examples of our actuator may be connected to the appropriate portion of the flow valve, such as a stem, to move the flow valve between the closed and open positions.
- the actuator may include one or more springs as a failsafe closed arrangement.
- a subsea control system such as a blow-out-preventer, a tree system or a manifold may be provided with the actuator of examples of our invention.
- the actuator may be provided in combination with a flow valve.
- Blow-out-preventers, tree systems and manifolds provided with actuators of examples of our invention may be controlled inexpensively and reliably with electrical control lines for the electric motor to move the piston. Electrical control lines are less prone to failure and less expensive to install and maintain than conventional hydraulic umbilicals.
- Figure 1 shows an example of an actuator according to the present invention
- Figure 2 shows the actuator of Figure 1 with the piston in a second position
- Figure 3 shows an example of the actuator arranged to actuate a flow valve
- Figure 4 shows an example of an actuator with a linear electric motor
- Figure 5 shows an example of an actuator with an internal locking valve
- Figure 6 shows an example of an actuator with a balanced flow valve
- Figure 7 shows an example of an actuator with an override
- Figure 8 shows an example of an actuator arranged to actuate a ball valve
- Figure 9 shows an example of an actuator with a linear motor arranged to actuate a ball valve
- Figure 10 shows an example of a tree incorporating examples of actuators according to the present invention
- Figure 11 shows an example of a manifold system incorporating examples of actuators according to the present invention
- Figure 12 shows an example of a blow-out-preventer incorporating examples of actuators according to the present invention.
- FIG 1 shows an example of an actuator 10 according to the present invention.
- the actuator 10 includes a piston 11 which is shown in Figure 1 in a first position and which is arranged to be moved to a second position such as shown in Figure 2 for example.
- a hydraulic locking mechanism 12 is provided to lock the piston 11 in the first or second positions.
- the hydraulic locking mechanism 12 comprises a locking valve 13 provided in a by-pass conduit 14 connected at each end to a housing 15 in which the piston 11 is provided.
- the ends of the by-pass conduit 14 are arranged to be connected to the housing 15 outside the range of movement of the piston 11 within the housing 15.
- the by-pass conduit 14 enables hydraulic fluid within the housing 15 to be displaced from one side of the piston 11 to the other when the piston is moved in either direction.
- Closing the locking valve 13 prevents hydraulic fluid passing through the by-pass conduit 14 such that the piston 11 is hydraulically locked in position when the locking valve 13 is closed.
- An electric motor 16 is provided to move the piston 11 whilst the valve 13 is open.
- the electric motor 16 may be arranged to move or turn in one direction or another or stop by a control line 17, such as an electrical cable carrying a control signal which may be operated remotely for example.
- the locking valve 13 may also be opened or closed by a control line, such as an electrical cable.
- the piston 11 is shown with a stem 18 which may be used to actuate an associated component such as a valve for example.
- Using an electric motor 16 to move the piston 11 provides an actuator 10 which may be inexpensively and reliably controlled.
- Figure 3 shows an example of the actuator 10 connected to a flow valve 20, in this example a gate valve.
- This gate valve has a moveable gate 21 with an orifice 22 which may be moved back and forth by the stem 18 to be either in line with a perpendicular flow conduit (not shown) allowing the passage of fluid through the flow valve 20 or alternatively to block the flow of fluid.
- the flow valve 20 has a stem seal 23 to allow movement of the stem 18 but prevent hydraulic fluid leaking from the actuator 10.
- the stem seal 23 is also provided to prevent fluid passing through the flow valve 20, such as from a well bore for example, from entering the actuator mechanism.
- the actuator of this example has been provided with a resilient member 24, in this example a spring, to provide a failsafe closed feature.
- the hydraulic locking mechanism 12 of the example of Figure 3 includes two locking valves 13, such as solenoid check valves, to provide double redundancy.
- the one or more locking valves 13 may be provided attached to or on a housing of the actuator 10 or the associated flow valve 20 or any other associated component such as a blowout-preventer, tree system or manifold for example.
- the by-pass conduit 14 includes a damper 25.
- the damper 25 may be a restrictor or orifice through which the hydraulic fluid is arranged to flow. Under sufficiently high velocity, such as if the actuator 10 is closed under the force of the spring 24, a significant fluid pressure drop will take place, with a corresponding high level of flow induced shear. This high shear flow will consequently raise the temperature of the actuator fluid.
- the by-pass conduit 14 of the example of Figure 3 also includes a compensator 26 to account for rising stem effects produced by volume changes due to the movement of the stem 18.
- the electric motor 16 of the example of Figure 3 has an associated rotary - linear converter 27 to convert rotary motion produced by the electric motor 16 into linear motion to move the piston 11.
- the rotary- linear converter 27 may for example be a ball screw or helical spline with back-drive functionality.
- the electric motor 16 may be provided with a gear set for appropriate movement of a stem 18.
- An electrical penetration 28 is shown in this example for the control line 17, such as an electrical wire, to control the operation of the electrical motor 16.
- the outer edge of the piston 11 engages the inside surface of the housing 15 providing a seal.
- the seal is enhanced by the provision of an O-ring 29 around the circumference of the piston 11.
- an appropriately shaped seal 29 may be provided.
- the actuator 10 could periodically have the hydraulic fluid levels topped- up. If used in underwater applications, the hydraulic fluid could be topped-up with a remote-operated-vehicle (ROV) using a hot stab for example which could engage an isolation valve (not shown) connected to the by-pass conduit 14 or housing 15.
- ROV remote-operated-vehicle
- Figure 4 shows an example of the actuator 10 in combination with a flow valve 20 in a similar arrangement to that shown in Figure 3 except that instead of a rotary electric motor 16 and associated rotary - linear converter 27, the example of Figure 4 has an electric linear motor 30.
- Figure 5 shows an example of the actuator 10 in which the hydraulic locking mechanism 12 is provided inside the actuator housing 15 instead of externally as in the previous examples.
- the locking valve 13 comprises a mechanical poppet valve associated with the piton 11 and stem 17 as shown in greater detail in the enlargement of the hydraulic locking mechanism 12 in the Figure.
- the volumes on each side of the piston 1 1 are connected by conduits 40 on a first side of the piston 11, the poppet valve 41 and a port 42 on the other side of the piston 11.
- Any suitable type of valve 13 may be used, but in the example of the poppet valve 41 shown in the enlargement of Figure 5 there is provided a poppet seal interface 43, a left spring 44, a right spring 45, a sliding spring interface 46 and an actuator interface 47.
- the left spring 44 unseats the poppet and the right spring closes the poppet.
- the poppet valve 41 allows the piston 11 to move during the valve open stroke.
- the poppet spring load When the electric motor 16 provides full motor load, the poppet spring load will be such that the poppet valve 41 will open permitting the flow of hydraulic fluid from one side of the piston 11 to the other and enabling the piston 11 to move. Conversely, with no or a light electric motor load, the poppet valve 41 will remain closed preventing the flow of hydraulic fluid from one side of the piston 11 to the other and locking the piston 11 in place.
- Figure 6 shows the actuator 10 provided to control a different type of flow valve 20 from Figure 3 to 5.
- the actuator 10 is shown connected to a balanced stem valve 20 which includes a fluid pressure balance port 51 to balance the pressure on each side of the gate 52.
- a cap 54 may be provided on the end of the balanced valve 20.
- FIG. 7 shows the actuator 10 provided with a mechanical override 60.
- an override shaft 61 is connected to or provided as an extension of the stem 18.
- the position of the override shaft 61 at an interface 62 at the end of the housing can provide a visual indication of the status of the actuator 10.
- a seal 63 can provide a barrier to sea water.
- a ROV may be used to move the override shaft 61, in this example in a linear direction.
- the override shaft 61 could be actuated with rotary motion if a rotary - linear converter such as a thread interface is provided.
- the override shaft 61 is preferably restrained with a key which may be engaged with the housing for example to prevent rotation.
- Figure 8 shows an example of the actuator 10 connected to a ball valve 20 which is actuated by rotation of an actuator rotary stem 71 arranged to rotate a ball 72 within the flow valve 20. Similar to the example in figure 3, a stem seal 73 is provided to contain fluids on each side of the stem. Unlike the previous examples, in this example the piston 11 and hydraulic locking mechanism 12 are provided on the opposite side of the electric motor 16 from the flow valve 20 with the actuator unit sealed at the end 74 furthest from the flow valve 20.
- Figure 9 shows an example of the actuator 10 with a ball valve like Figure 8 except with a linear motor 30 rather than the rotary motor 16 of Figure 8.
- the actuator 10 described above may be provided in many applications or subsea control systems such as in a tree, a manifold and a blow-out-preventer.
- Figure 10 shows an example of a tree 100 provided with actuators 10.
- the actuators 10 may each be associated with a corresponding flow valve.
- a wellhead 101 is provided with a tubing hanger 102 and a tree connector 103 on which is provided a master valve block 104 and a tree cap 105.
- the actuators 10 have been found to provide reliable control of flow valves within the tree 100 with reliable and inexpensive control from electrical control wires which may be controlled from the surface for example.
- Figure 11 is an example of a manifold system 200 including a number of actuators 10 each provided with an associated flow valve.
- flow line 201 is an oil production line
- flow line 202 is a water injection line
- flow line 203 is a well test line
- flow line 204 connects to the water injection line 202
- flow lines 205 and 206 connect to an oil production tree via the oil production line 201
- valve 207 is an actuator 10 controlled pigging valve.
- Figure 12 shows an example of blow-out-preventer 300.
- ring gaskets 301 are provided above an annular BOP 302 with a clamp 303 below it.
- Ram BOPs 304 are provided with a drilling spool 305 and a valve 306 which is controlled by the actuator 10 of an example of our invention as explained above.
- the blow-out- preventer 300 is shown in this example provided on a wellhead 307 with casing 308.
- the actuator 10 with flow or isolation valves 20, tree systems 100, manifold systems 200 and BOPs 300 described above may be combined in any desired arrangement of subsea systems.
- the actuators 10 may be provided in a cluster tree and manifold arrangement, a template tree and manifold arrangement, a tree with a production flow base featuring a production isolation valve, a daisy chained plurality of tree systems, a single tree tied-back to a surface platform or multiple combinations of all of the above.
- Examples of the actuator 10 described above with an electric motor 16, 30 may be relatively inexpensively and reliably remotely controlled, such as from a surface location, by an electrical cable which is less expensive and less prone to failure than a hydraulic line which may suffer from leaks and loss of pressure.
- the hydraulic locking mechanism 12 may be self-contained and also not require any controlling supply of hydraulic fluid, reducing costs and increasing reliability.
- the actuator 10 may be used to actuate any appropriate component such as a flow or isolation valve 20 and used in a subsea control system such as a blow-out-preventer, a tree system or a manifold or with a combination of components or in a combination of systems.
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
L'invention concerne un actionneur (10) pour vanne de débit ou d'isolement, qui peut être utilisé en fond marin. L'actionneur comprend: un piston (11) agencé de manière à se déplacer entre une première et une seconde position; un mécanisme de verrouillage hydraulique (12) pour verrouiller le piston (11) dans la première ou la seconde position; et un moteur électrique (16) pour déplacer le piston (11) de la première à la seconde position. Un actionneur sous-marin (10) actionné par moteur électrique peut être commandé à distance de manière relativement peu onéreuse et fiable par une ligne de commande électrique (17) telle qu'un câble électrique, par exemple depuis la surface.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1515809.0A GB2541943A (en) | 2015-09-07 | 2015-09-07 | Actuator |
GB1515809.0 | 2015-09-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017042152A1 true WO2017042152A1 (fr) | 2017-03-16 |
Family
ID=54345864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2016/070952 WO2017042152A1 (fr) | 2015-09-07 | 2016-09-06 | Actionneur de vanne doté d'un dispositif de verrouillage hydraulique |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2541943A (fr) |
WO (1) | WO2017042152A1 (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019072728A1 (fr) * | 2017-10-12 | 2019-04-18 | Robert Bosch Gmbh | Système électrohydraulique pourvu d'un dispositif de réglage pour une vanne |
WO2020086230A1 (fr) * | 2018-10-26 | 2020-04-30 | Forum Us, Inc. | Outil de couple à moteur électrique |
US10987768B2 (en) | 2018-10-26 | 2021-04-27 | Forum Us, Inc. | Torque tool with latch assembly |
US11441579B2 (en) | 2018-08-17 | 2022-09-13 | Schlumberger Technology Corporation | Accumulator system |
US11624254B2 (en) | 2018-08-17 | 2023-04-11 | Schlumberger Technology Corporation | Accumulator system |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110529072B (zh) * | 2019-08-20 | 2024-05-24 | 西南石油大学 | 一种直电式控制水下测试树 |
US12000241B2 (en) | 2020-02-18 | 2024-06-04 | Schlumberger Technology Corporation | Electronic rupture disc with atmospheric chamber |
GB2594556B8 (en) | 2020-02-18 | 2022-06-15 | Schlumberger Technology Bv | Hydraulic trigger for isolation valves |
WO2021212103A1 (fr) | 2020-04-17 | 2021-10-21 | Schlumberger Technology Corporation | Déclencheur hydraulique ayant une force de ressort verrouillée |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4920811A (en) * | 1988-03-10 | 1990-05-01 | The British Petroleum Company P.L.C. | Fail-safe release actuator mechanism |
US5279363A (en) * | 1991-07-15 | 1994-01-18 | Halliburton Company | Shut-in tools |
GB2364396A (en) * | 2000-05-16 | 2002-01-23 | Kongsberg Offshore As | Electric actuator system for subsea environment |
US20060243937A1 (en) * | 2005-04-29 | 2006-11-02 | Cooper Cameron Corporation | Hydraulic override |
US20130255802A1 (en) * | 2012-04-02 | 2013-10-03 | Cameron International Corporation | Valve and hydraulic controller |
WO2014009756A2 (fr) * | 2012-07-13 | 2014-01-16 | Neil Andrew Abercrombie Simpson | Outil de fond de trou et procédé |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7510001B2 (en) * | 2005-09-14 | 2009-03-31 | Schlumberger Technology Corp. | Downhole actuation tools |
-
2015
- 2015-09-07 GB GB1515809.0A patent/GB2541943A/en not_active Withdrawn
-
2016
- 2016-09-06 WO PCT/EP2016/070952 patent/WO2017042152A1/fr active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4920811A (en) * | 1988-03-10 | 1990-05-01 | The British Petroleum Company P.L.C. | Fail-safe release actuator mechanism |
US5279363A (en) * | 1991-07-15 | 1994-01-18 | Halliburton Company | Shut-in tools |
GB2364396A (en) * | 2000-05-16 | 2002-01-23 | Kongsberg Offshore As | Electric actuator system for subsea environment |
US20060243937A1 (en) * | 2005-04-29 | 2006-11-02 | Cooper Cameron Corporation | Hydraulic override |
US20130255802A1 (en) * | 2012-04-02 | 2013-10-03 | Cameron International Corporation | Valve and hydraulic controller |
WO2014009756A2 (fr) * | 2012-07-13 | 2014-01-16 | Neil Andrew Abercrombie Simpson | Outil de fond de trou et procédé |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019072728A1 (fr) * | 2017-10-12 | 2019-04-18 | Robert Bosch Gmbh | Système électrohydraulique pourvu d'un dispositif de réglage pour une vanne |
US11441579B2 (en) | 2018-08-17 | 2022-09-13 | Schlumberger Technology Corporation | Accumulator system |
US11624254B2 (en) | 2018-08-17 | 2023-04-11 | Schlumberger Technology Corporation | Accumulator system |
US11795978B2 (en) | 2018-08-17 | 2023-10-24 | Schlumberger Technology Corporation | Accumulator system |
WO2020086230A1 (fr) * | 2018-10-26 | 2020-04-30 | Forum Us, Inc. | Outil de couple à moteur électrique |
US10987768B2 (en) | 2018-10-26 | 2021-04-27 | Forum Us, Inc. | Torque tool with latch assembly |
US11040421B2 (en) | 2018-10-26 | 2021-06-22 | Forum Us, Inc. | Torque tool with electric motors |
Also Published As
Publication number | Publication date |
---|---|
GB201515809D0 (en) | 2015-10-21 |
GB2541943A (en) | 2017-03-08 |
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