WO2017030444A1 - Rod locking apparatus - Google Patents
Rod locking apparatus Download PDFInfo
- Publication number
- WO2017030444A1 WO2017030444A1 PCT/NO2016/050167 NO2016050167W WO2017030444A1 WO 2017030444 A1 WO2017030444 A1 WO 2017030444A1 NO 2016050167 W NO2016050167 W NO 2016050167W WO 2017030444 A1 WO2017030444 A1 WO 2017030444A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tubular passage
- piston
- wedge
- locking apparatus
- rod locking
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims description 30
- 238000005553 drilling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
- E21B33/061—Ram-type blow-out preventers, e.g. with pivoting rams
- E21B33/062—Ram-type blow-out preventers, e.g. with pivoting rams with sliding rams
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
- F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
Definitions
- the present invention relates to a rod locking apparatus, and in particular to a rod locking apparatus suitable for use in locking the actuators in ram-type blow out preventers.
- This invention relates to a rod locking device for locking reciprocating piston type fluid actuators in a preferred position. Actuators of this type are
- a rod locking apparatus comprising: a housing having a first and second intersecting tubular passages, the first tubular passage being provided with a serrated locking surface, a wedge piston slidably arranged in the first tubular passage, the wedge piston having a front side with a wedge surface adapted in use to engage an end surface of a rod to be locked, wherein the wedge piston has a serrated rear side which engages with the serrated locking surface.
- Providing the rear side of the wedge piston with serrations which engage with the serrated locking surface means that the area of contact between the two serrated surfaces can be larger than in the arrangement illustrated in US 4,969,390. This provides a higher frictional locking force, and therefore provides more secure locking and/or allows a larger wedge angle to be used. A larger wedge angle gives a shorter stroke length, and thus a shorter, and more compact locking device.
- the serrated locking surface may be integral with the remainder of the housing, or may be provided on a separate support part which is fixed relative to the housing.
- the wedge piston is movable between a closed position in which it
- the wedge piston may be provided with a through passage which extends from the front side to the rear side of the wedge piston generally parallel to the second tubular passage such that when the wedge piston is in the open position, the through passage is generally coaxial with the second tubular passage, and when the wedge piston is in the closed position the through passage is not aligned with the second tubular passage.
- the rear side of the wedge piston may be inclined at an angle of between 10 and 20 ° to the wedge surface. In one embodiment, the rear side of the wedge piston is inclined at an angle of around 12 ° to the wedge surface.
- the first tubular passage may extend at an angle of between 100 and 1 10 ° to the second tubular passage. In one embodiment, the first tubular passage extends at an angle of 102 ° to the second tubular passage.
- the wedge piston may further be provided with two end surfaces which extend generally perpendicular to the rear side of the wedge piston.
- a first one of the two end surfaces may provide a first piston face on which pressurized fluid introduced into a first end of the first tubular passage acts to push the wedge piston along the first tubular passage towards a second end thereof.
- a second one of the two end surfaces may provide a second piston face on which pressurized fluid introduced into the second end of the first tubular passage acts to push the wedge piston along the first tubular passage towards the first end thereof.
- Movement of the wedge piston from the open position to the closed position may comprise movement of the wedge piston from the second end of the first tubular passage towards the first end of the first tubular passage, and vice versa.
- the surface area of the first piston face may be greater than the surface area of the second piston face.
- the rod locking apparatus is further provided with a seal which extends between the housing and the wedge piston to substantially prevent flow of fluid along the first tubular passage past the seal, whilst allowing the wedge piston to slide along the first tubular passage.
- the seal is mounted on the wedge piston.
- the seal comprises an 0- ring mounted in a groove in the wedge piston.
- the housing may further be provided with a first end cap which closes the first tubular passage at a first end thereof.
- the first end cap may be provided with an aperture and means for the supply of pressurized fluid into the first end of the first tubular passage via the aperture in the first end cap.
- the housing may further be provided with a second end cap which closes the first tubular passage at a second end thereof.
- the second end cap may be provided with an aperture and means for the supply of pressurized fluid in to the second end of the first tubular passage via the aperture in the end cap.
- the housing may be provided with a supply tube which extends from the aperture in the second end cap into a bore in the wedge piston, there being a seal between the supply tube and the wedge piston which provides a substantially fluid tight seal between an interior surface of the wedge piston surrounding the bore and an exterior surface of the supply tube.
- a supply tube which extends from the aperture in the second end cap into a bore in the wedge piston, there being a seal between the supply tube and the wedge piston which provides a substantially fluid tight seal between an interior surface of the wedge piston surrounding the bore and an exterior surface of the supply tube.
- an end portion of the bore is the second piston face.
- a rod locking apparatus having a rod located in the second tubular passage, the rod having a first end which is located in the second tubular passage and a second end which extends out of the second tubular passage.
- the surface area of the serrated locking surface is advantageously greater than the surface area of the first end of the rod.
- a rod locking apparatus comprising: a housing having a first and second intersecting tubular passages, a wedge piston slidably arranged in the first tubular passage, the wedge piston having a front side with a wedge surface adapted in use to engage an end surface of a rod to be locked, and two end surfaces which extend generally perpendicular to the rear side of the wedge piston, the wedge piston being movable between a closed position in which it substantially blocks the second tubular passage, and an open position in which the second tubular passage is open, a first one of the two end surfaces providing a first piston face on which pressurized fluid introduced into a first end of the first tubular passage acts to push the wedge piston along the first tubular passage to a second end thereof, a second one of the two end surfaces providing a second piston face on which pressurized fluid introduced into the second end of the first tubular passage acts to push the wedge piston along the first tubular passage to the first end thereof, movement of the wedge piston from the open position to the closed position comprising movement of the wedge piston
- this allows reliable unlocking due to the higher force from the larger piston.
- a rod locking apparatus having a large interacting locking area may have a large frictional locking force and thus may need higher force to unlock.
- the rod locking apparatus according to this embodiment may have any of the features or any combination of features of the rod locking apparatus according to the previously described embodiments. Brief description of the drawings
- FIGURE 1 is a perspective view of a cross-section through an assembly of a rod locking apparatus according to the invention and a tail rod of a blowout preventer actuator
- FIGURE 2 is a longitudinal cross-section through the assembly illustrated in Figure 1 in the open position
- FIGURE 3 is a longitudinal cross-section through the assembly illustrated in Figure 2 in the closed position
- FIGURE 4a is a perspective view of the wedge piston and serrated rear side of the rod locking apparatus illustrated in Figure 1 ,
- FIGURE 4b is a perspective view of the serrated locking surface of the rod locking apparatus illustrated in Figure 1 .
- the invention relates to a new and improved subsea ram type blowout preventer hydraulically actuated mechanical, ram locking device.
- the device may be actuated as part of the single, overall rams closing function, or as a separate ram locking only function.
- the ram locking device is mounted as an integral sub-assembly to the pressure containing and controlling ram BOP bonnet assembly, whereby the bonnet assembly is mounted to the ram type BOP main pressure controlling and containing body member.
- a general body, bonnet, and locking assembly these parts make up primary members of a subsea ram type blowout preventer.
- blowout preventers were developed to cope with extreme erratic pressures and uncontrolled flow emanating from a well reservoir during drilling. Known as a “kick", this flow of pressure can lead to a potentially catastrophic event called a blowout.
- blowout preventers are intended to prevent tubular goods used in well drilling, such as, drill pipe, casing, collars, tools and drilling fluid from being blown out of the wellbore when a kick or blowout threatens.
- Blowout preventers are critical to the safety of crew, drilling rig, and
- blowout preventers are intended to provide an additional and fail-safe barrier to the systems that include them.
- Ram-type blowout preventers are part of an overall pressure control system used in oil and gas operations commonly used as pressure containment and unexpected wellbore pressure spikes and well pressure control events.
- a conventional ram-type BOP is similar in operation to a gate valve, but uses a pair of opposing steel plungers or, rams. The rams extend toward the center of the wellbore to restrict flow or retract open in order to permit flow.
- the inner and top faces of the rams are fitted with composite steel and elastomeric packers that press against each other, against the wellbore, and around well tubular members running through the wellbore. Outlets at the sides of the BOP housing (body) are used for connection to choke and kill lines or valves.
- Rams, or ram blocks are generally of five common types: pipe, variable bore pipe, blind, shear, and blind shear.
- the ram type blow out preventer is further usually integrated with additional well containment and control devices that inclusively make up a subsea blowout preventer stack.
- Figure 1 illustrates one embodiment of a ram locking device 100 according to the present invention.
- the device 100 comprises a main housing 1 having a first tubular passage 22 and a second tubular passage 23.
- first tubular passage 22 and a second tubular passage 23.
- the housing 1 is provided with a mounting attachment 5 to attach the ram locking device to the BOP bonnet 20, as illustrated in Figure 2.
- the first tubular passage is provided with a serrated locking surface 4a, which in this embodiment is provided on a support part 4 (illustrated in detail in Figure 4B), which is fixed relative to the housing 1 and described in further detail below. It should be appreciated, however, that the support part 4 may be integral with the housing.
- a wedge piston 12 is slidably provided in the housing 1.
- the wedge piston 12 has a front side with a wedge surface 1 1 which engages a back end surface 13a of a tail rod 13 of a blow out preventer actuator.
- the wedge piston 12 also has a serrated rear side which engages with the serrated locking surface 4a.
- the tail rod 13 is coupled to a hydraulic, ram operating piston 14 provided in the BOP bonnet 20 (see Fig. 2), and extends into the second tubular passage 23.
- the wedge piston 12 is movable between a closed position in which it substantially blocks the second tubular passage 23 and an open position in which the second tubular passage 23 is open.
- the wedge piston 12 has a transverse bore forming a through passage 17 which extends from the front side to the rear side of the wedge piston 12 generally parallel to the second tubular passage 23 and, when the wedge piston 21 is in the open position, is aligned with the second tubular passage 23 so that the tail rod 13 may extend along the second tubular passage 23 as shown in Figure 2.
- the through passage 17 is not aligned with the second tubular passage 23, as illustrated in Figure 1 .
- the wedge piston 12 incorporates a spline shaped rear side 16 which utilize a series of ridges, or teeth, that mesh with grooves in the serrated locking surface 4a (see Fig. 4B).
- the design of the serrations on the rear side 16 of the wedge piston 12 and the serrated locking surface 4a may be according to one of the alternatives described in US 4,969,390 or any other suitable design. This may include splines, grooves, ridges, or teeth, or a combination thereof, suitable for producing a mating motion and a friction-based locking effect between the rear side 16 of the wedge piston 12 and the serrated locking surface 4a.
- the rear side 16 of the wedge piston 12 is inclined at an angle of between 10 and 20 ° to the wedge surface 1 1 .
- the rear side 16 of the wedge piston 12 is inclined at an angle of around 12 ° to the wedge surface 1 1 .
- the first tubular passage 22 extends at an angle of between 100 and 1 10 ° to the second tubular 23 passage.
- the first tubular passage 22 extends at an angle of 102 ° to the second tubular passage 23. Designing the first tubular passage 22 to extend at an angle to the second tubular passage 23 which corresponds to the angle of inclination between the rear side 16 of the wedge piston 12 and the wedge surface 1 1 permits the end surface 13a of the rod 13 to extend perpendicularly to the rod longitudinal axis.
- the wedge piston 12 is further provided with two end surfaces 9, 24 which extend generally perpendicular to the rear side 16 of the wedge piston 12.
- a first one 9 of the two end surfaces 9, 24 provides a first piston face on which pressurized fluid introduced into a first end 27a of the first tubular passage 22 acts to push the wedge piston 12 along the first tubular passage 22 towards a second end 27b thereof.
- a second one 24 of the two end surfaces 9, 24 provides a second piston face on which pressurized fluid introduced into the second end 27b of the first tubular passage 22 acts to push the wedge piston along the first tubular passage 22 towards the first end 27a thereof.
- movement of the wedge piston 12 from the open position to the closed position comprises translational movement of the wedge piston 12 in a direction extending from the second end 27b of the first tubular passage 22 towards the first end of the first tubular passage, and vice versa.
- a first end cap 8a and a second end cap 8b close the first tubular passage 22 at its outer ends 27a and 27b.
- Apertures in the form of channels 21 a and 21 b are provided through the end caps 8a and 8b along with means for supplying pressurized fluid therethrough and into the first tubular passage 22.
- the rod locking device is provided with a seal 26 which extends between the housing and the wedge piston to substantially prevent flow of fluid along the first tubular passage past the seal, whilst allowing the wedge piston to slide along the first tubular passage.
- the seal is provided in the form of an O-ring mounted in a groove on the wedge piston 12, to seal against the inner surface of the first tubular passage 22 and delimit a cavity 15. Providing pressurized fluid through channel 21 a and into cavity 15 produces a pressure force on the first end 9 of the wedge piston 12 and acts to push the wedge piston 12 along the first tubular passage 22 in a direction away from the first end 27a. This moves the wedge piston 12 into the open, or unlocked, position of the locking device and BOP ram.
- a supply tube 2 extends into the first tubular passage 22 and into a wedge piston bore 10 provided in the wedge piston 12.
- the supply tube 2 has an internal bore permitting hydraulic fluid communication from a hydraulic fluid supply (not shown) through aperture/channel 21 b in the second end cap 8b and into bore 10.
- the supply tube 2 is sealed against wedge piston bore 10, for example by means of O- rings 25 (see Figs 2 and 3).
- the second piston face is therefore formed by the end face of the wedge piston bore 10.
- Provision of hydraulic fluid pressure into wedge piston bore 10 through supply tube 2 generates a pressure force on the second piston face in the wedge piston bore 10 and urges the wedge piston 12 away from second end 27b along the first tubular passage 22 and to a locked position of the rod locking device and BOP ram.
- the surface area of the first piston face is greater than the surface area of the second piston face. This means that, for a given fluid pressure, the force moving the wedge piston 12 to the open position is greater than the force moving the wedge piston 12 to the closed position. This may have the advantage of allowing reliable unlocking of the rod locking device and consequent opening of the BOP.
- the second piston face 24 may be provided on the end of the wedge piston 12 facing the second end 27b of the first tubular passage , the second end 24 of the wedge piston 12 being sealed against the inner surface of the first tubular passage, in a similar way to the arrangement provided by piston face 9.
- a ram locking device is shown in an open, or unlocked, position. In this state the BOP ram is open. The ram locking device is fixed to a BOP bonnet 20 by mounting attachment 5. A ram operating piston 14 is provided in the BOP bonnet 20 to operate the ram. In this position the through passage 17 of the wedge piston 12 is aligned with the second tubular passage 23 and the tail rod 13 extends through the through passage 17.
- Figure 3 shows the closed position of the ram locking device is shown. In this state, closing of the BOP ram has been performed by ram operating piston 14 and the tail rod 13 has been moved out of the through passage 17.
- piston surface 9 is provided with a larger area than second piston surface 24' (see Figure 1 ), the locking device can be securely unlocked even in the case of a strong friction locking effect.
- Figure 4A shows details of the wedge piston 12 with the serrated rear surface 16 and the through passage 17.
- Figure 4A further shows the support part 4.
- the support part 4 may have a throughbore 27 which is aligned with the second tubular passage 23 (see Fig. 1 ) to allow the rod 13 to extend through the throughbore 27 in the open position of the locking apparatus, as shown in Fig. 2.
- Figure 4B shows further details of a part of the support part 4, showing the serrated locking surface 4a which, in use, engages with the serrated rear side 16 of the wedge piston 12.
- the serrated rear side 16 is provided along substantially the full length of the wedge piston 12.
- the area of the serrated locking surface 4a may be adapted for a particular use or operating requirements, thus providing freedom to, for example, use a large locking surface in applications with high safety requirements.
- the rod locking device according to the invention thus provides a simple, robust, and more reliable, hydraulically actuated, mechanical assembly that provides means to lock the rams of a ram-type blowout preventer in the closed and sealed position, even if hydraulic pressure is lost or removed, and only allows the rams to open when hydraulic pressure is intentionally applied to the BOP and locking mechanism's operating system for the expressed purpose of opening the blowout preventer's ram assemblies.
- the rod locking device according to the invention is suitable to lock any type of ram (pipe, variable bore pipe, shear, blind, shearing blind) in an infinite range of closed positions, providing a ridged mechanical locking mechanism for rams that will not allow them to open, or retreat from their closed position, even if no closing pressure is applied, or maintained.
- the rod locking device is equally suited for use with wellbore control devices utilizing gates, including such gates having shearing capability.
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Actuator (AREA)
- Clamps And Clips (AREA)
- Braking Arrangements (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2016307635A AU2016307635A1 (en) | 2015-08-19 | 2016-08-15 | Rod locking apparatus |
GB1803686.3A GB2557777A (en) | 2015-08-19 | 2016-08-15 | Rod locking apparatus |
BR112018003204-2A BR112018003204A2 (en) | 2015-08-19 | 2016-08-15 | rod locking apparatus |
US15/753,174 US20180252060A1 (en) | 2015-08-19 | 2016-08-15 | Rod locking apparatus |
NO20180337A NO20180337A1 (en) | 2015-08-19 | 2018-03-07 | Rod locking appratus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1514762.2 | 2015-08-19 | ||
GBGB1514762.2A GB201514762D0 (en) | 2015-08-19 | 2015-08-19 | Rod locking apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017030444A1 true WO2017030444A1 (en) | 2017-02-23 |
Family
ID=54258861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO2016/050167 WO2017030444A1 (en) | 2015-08-19 | 2016-08-15 | Rod locking apparatus |
Country Status (6)
Country | Link |
---|---|
US (1) | US20180252060A1 (en) |
AU (1) | AU2016307635A1 (en) |
BR (1) | BR112018003204A2 (en) |
GB (2) | GB201514762D0 (en) |
NO (1) | NO20180337A1 (en) |
WO (1) | WO2017030444A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2020329298A1 (en) * | 2019-08-15 | 2022-03-10 | Kinetic Pressure Control, Ltd. | Piston and gate assembly for kinetic pressure control apparatus ram |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3208357A (en) * | 1963-11-19 | 1965-09-28 | Cameron Iron Works Inc | Reciprocating piston type actuators |
US4601232A (en) * | 1985-03-01 | 1986-07-22 | Cameron Iron Works, Inc. | Rod locking device |
US4969390A (en) * | 1989-05-30 | 1990-11-13 | Cooper Industries, Inc. | Rod locking device |
US20120055679A1 (en) * | 2010-09-08 | 2012-03-08 | Denzal Wayne Van Winkle | System and Method for Rescuing a Malfunctioning Subsea Blowout Preventer |
US20130264502A1 (en) * | 2012-04-10 | 2013-10-10 | National Oilwell Varco, L.P. | Blowout Preventer Locking Door Assembly and Method of Using Same |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4043252A (en) * | 1976-03-01 | 1977-08-23 | Wawrzyniak Walter W | Cylinder lock structure |
US4690033A (en) * | 1985-12-16 | 1987-09-01 | Winkle Denzal W Van | Self actuating locking and unlocking arrangement and method for reciprocating piston type actuators |
US4969627A (en) * | 1986-10-27 | 1990-11-13 | Cameron Iron Works Usa, Inc. | Rod locking device |
US4938290A (en) * | 1989-06-19 | 1990-07-03 | Eastern Oil Tools Pte Ltd | Wireline blowout preventer having mechanical and hydraulic sealing |
US6006647A (en) * | 1998-05-08 | 1999-12-28 | Tuboscope I/P Inc. | Actuator with free-floating piston for a blowout preventer and the like |
US7195224B2 (en) * | 2005-02-01 | 2007-03-27 | Varco I/P, Inc. | Blowout preventer and locking mechanism |
EP2836669B1 (en) * | 2012-04-10 | 2019-07-24 | National Oilwell Varco, L.P. | Blowout preventer with locking ram assembly and method of using same |
US8944403B2 (en) * | 2012-07-19 | 2015-02-03 | Cameron International Corporation | Blowout preventer with pressure-isolated operating piston assembly |
US9453386B2 (en) * | 2013-12-31 | 2016-09-27 | Cameron International Corporation | Magnetorheological fluid locking system |
US10018009B2 (en) * | 2015-02-26 | 2018-07-10 | Cameron International Corporation | Locking apparatus |
-
2015
- 2015-08-19 GB GBGB1514762.2A patent/GB201514762D0/en not_active Ceased
-
2016
- 2016-08-15 BR BR112018003204-2A patent/BR112018003204A2/en not_active Application Discontinuation
- 2016-08-15 WO PCT/NO2016/050167 patent/WO2017030444A1/en active Application Filing
- 2016-08-15 GB GB1803686.3A patent/GB2557777A/en not_active Withdrawn
- 2016-08-15 AU AU2016307635A patent/AU2016307635A1/en not_active Abandoned
- 2016-08-15 US US15/753,174 patent/US20180252060A1/en not_active Abandoned
-
2018
- 2018-03-07 NO NO20180337A patent/NO20180337A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3208357A (en) * | 1963-11-19 | 1965-09-28 | Cameron Iron Works Inc | Reciprocating piston type actuators |
US4601232A (en) * | 1985-03-01 | 1986-07-22 | Cameron Iron Works, Inc. | Rod locking device |
US4969390A (en) * | 1989-05-30 | 1990-11-13 | Cooper Industries, Inc. | Rod locking device |
US20120055679A1 (en) * | 2010-09-08 | 2012-03-08 | Denzal Wayne Van Winkle | System and Method for Rescuing a Malfunctioning Subsea Blowout Preventer |
US20130264502A1 (en) * | 2012-04-10 | 2013-10-10 | National Oilwell Varco, L.P. | Blowout Preventer Locking Door Assembly and Method of Using Same |
Also Published As
Publication number | Publication date |
---|---|
US20180252060A1 (en) | 2018-09-06 |
BR112018003204A2 (en) | 2018-09-25 |
GB201803686D0 (en) | 2018-04-25 |
GB201514762D0 (en) | 2015-09-30 |
AU2016307635A1 (en) | 2018-03-29 |
AU2016307635A8 (en) | 2020-06-11 |
GB2557777A (en) | 2018-06-27 |
NO20180337A1 (en) | 2018-03-07 |
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