US20080247827A1 - Work-over rig assembly and methods thereof - Google Patents
Work-over rig assembly and methods thereof Download PDFInfo
- Publication number
- US20080247827A1 US20080247827A1 US12/079,362 US7936208A US2008247827A1 US 20080247827 A1 US20080247827 A1 US 20080247827A1 US 7936208 A US7936208 A US 7936208A US 2008247827 A1 US2008247827 A1 US 2008247827A1
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- over rig
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
- E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
- B66C23/52—Floating cranes
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
- E21B19/06—Elevators, i.e. rod- or tube-gripping devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/10—Arrangement of ship-based loading or unloading equipment for cargo or passengers of cranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/006—Platforms with supporting legs with lattice style supporting legs
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/0073—Details of sea bottom engaging footing
- E02B2017/0082—Spudcans, skirts or extended feet
Definitions
- Jack-up drilling rigs are typically employed for offshore energy exploration and development of offshore oil and gas fields. These drilling rigs generally float on a hull and have three or four extendable legs. In the typical situation, the drilling rig is pulled or towed to a location by one or more tug vessels. At the desired location, the drilling rig's legs are then extended to the ocean/sea floor, and the deck of the drilling rig is raised—or jacked up—out of the water. Preferably, the deck of the drilling rig is raised high enough to avoid any sea swells.
- the jacked-up deck of the drilling rig provides a stable structure in an environment from which a crew may perform drilling operations. These drilling rigs can withstand harsh weather conditions and may be deployed for long periods of time. Due to the nature of the work, deck space is limited and valuable.
- Drilling rigs may have a cantilever system, atop which sits a fixed rig.
- a drilling rig is moved to a location near an oil or gas platform, a free-standing conductor, or a fixed conductor and jacked up. Then, the cantilever system is skidded out from the transom of the drilling rig and over the desired well.
- These cantilever systems are stowed on the deck as a single unit, and take up a large portion of the limited space available.
- derrick barge Another type of vessel used in the oil and gas field is the derrick barge.
- Derrick barges are typically fitted with one or more cranes. Such cranes are typically mounted atop fixed and solid pedestals.
- the derrick barges like jack-up drilling rigs, are typically pulled or towed to location. Unlike jack-up drilling rigs, however, derrick barges typically do not jack-up. Accordingly, derrick barges are subject to the pitch and roll of the sea/ocean. Thus, the derrick barge's ability to work offshore is limited by the environment in which they serve.
- Lift boats like jack-up rigs, typically have three or four jack-up legs and may be elevated out of the water. Lift boats are considerably smaller than jack-up rigs, and are intended for short term deployment. These smaller vessels cannot withstand harsh weather conditions and are typically designed to move, under their own power and without the need for a tug boat, out of the way of bad weather. Accordingly, a lift boat is limited in its size and ability, and cannot function as a jack-up rig.
- U.S. Pat. No. 4,483,644 to Johnson describes a cantilever mobile marine rig with hydraulic load equalizers.
- the rig includes a deck structure and a cantilever assembly skiddingly mounted on the deck structure.
- the hydraulic load equalizers distribute the stresses between the cantilever assembly and the structure.
- U.S. Pat. No. 5,388,930 to McNease describes a method and apparatus for transporting and using a drilling apparatus or a construction crane apparatus from a single moveable vessel.
- a drilling apparatus of a construction crane apparatus is skidded onto the deck of a jack-up rig which is then floated to a remote location for use.
- U.S. Pat. No. 6,257,165 to Danos, Jr. et al. describes a vessel with a movable deck.
- the vessel comprises a first and second pontoon, a first catamaran hull attached thereto, and a platform.
- the pontoons and catamaran hull float on the waters' surface, and cannot be raised.
- the platform is connected to the catamaran hull using jack-up legs. In this manner, the platform may be raised and lowered relative to the catamaran hull using a jacking mechanism.
- first thruster nozzle attached to the first pontoon, the first thruster nozzle is attached in a 360 degree phase and a second thruster nozzle attached to the second pontoon, with the second thruster nozzle being movable in a 360 degree phase.
- U.S. Pat. No. 6,200,069 to Miller describes a jack-up work platform.
- the work platform of Miller comprises a hovercraft vessel outfitted with several jack up legs. Miller states that the hovercraft can traverse environmentally sensitive terrain such as brackish and freshwater marshes without the need to dig canals that may cause or exacerbate salt water instruction. Once the drilling or exploration site is reached, the jack up legs may be lowered, lifting the work platform above the surface.
- U.S. Pat. No. 6,607,331 to Sanders et al. describes a support structure for a lift crane, and in particular, to a lift crane jack-up structure, wherein the lift crane is positioned about a leg of the jack-up structure without relying upon the leg for structural support.
- the structure includes an above deck portion and a substructure situated below deck such that the jack-house is structurally integrated into the vessel.
- U.S. Pat. No. 6,926,097 to Blake describes an offshore jack-up workover rig, which is detachably mounted on an extensible cantilevered frame.
- the cantilevered frame comprises a pair of parallel support beams mounted to the vessel.
- a pair of cantilever skid beams rests on the support beam.
- at least one hydraulic ram and cylinder is provided to drive the cantilever skid beam over the support beam.
- Moise, II et al. describes a lift boat having recesses in the hull that receive the pads of the legs when the boat is underway.
- Moise, II et al. states that preferably, the total bottom surface area of the pads is preferably at least 30% of the surface area of the deck of the lift boat.
- Moise describes that the total bottom surface area of the pad is large enough such that, when the boat is loaded and jacked up, the pads exert less than 7 psi on the sea floor.
- Moise further describes propelling the boat using two rear propellers and rudders.
- a modified vessel which incorporates the beneficial features of a jack-up drilling rig, a derrick barge, and a lift boat to meet the demanding requirements of offshore construction, maintenance, and demolition of oil and gas platforms, free-standing conductors, and/or fixed conductors.
- the modified vessel has the stature of a jack-up rig with enhanced maneuverability.
- a modified vessel having an improved crane support system which optimizes the use of deck space is needed.
- a modified vessel which allows a work-over rig to be extended off of the transom of the modified vessel, or placed directly onto an offshore platform or structure, without taking up valuable deck space.
- a work-over rig assembly includes at least two braces, wherein each of the braces are adaptably mounted to a transom of an Elevating Support Vessel; a sub-base support structure adaptably mounted to each of the braces, wherein the sub-base support structure defines an aperture; a base structure adaptably mounted to the sub-base support structure; and a work-over rig adaptably mounted to the base structure, wherein the base structure and work-over rig are disposed over the aperture defined by the sub-base support structure.
- a crane is used to assembly the work-over rig assembly to the transom of the Elevating Support Vessel, and the crane is then used to affix a work-over rig atop the assembled work-over rig assembly.
- FIG. 1 is a side, partially cut-away, view of an exemplary Elevating Support Vessel having a crane disposed on a crane support of the present invention, three thrusters of the present invention, and a workover rig disposed on a sub-base structure of the present invention;
- FIG. 1A is a side, partially cut-away, view of an alternative Elevating Support Vessel
- FIG. 2 is a top-down, partially cut away, view of the exemplary Elevating Support Vessel showing the location of the three thrusters of the present invention
- FIG. 3 is a top-down view of the exemplary Elevating Support Vessel having the crane disposed on the crane support of the present invention and showing the tracks along which the crane support moves;
- FIG. 4 is a front view of the crane disposed on the crane support of the present invention.
- FIG. 5 is a front view of the T connection connecting the leg of the crane support with the track;
- FIG. 6 is a side view of the workover rig disposed on the sub-base structure of the present invention.
- FIG. 7 is a side view of the sub-base structure.
- FIG. 8 is a top-down view of the crane support.
- horizontal axis or “horizontal” mean a direction along the length of a vessel from the transom of the vessel to the bow of the vessel.
- the terms “vertical axis” or “vertical” mean a direction along the width of a vessel from the port of the vessel to the starboard of the vessel.
- depth axis mean a direction along the depth of a vessel from the bottom of the vessel to the top of the vessel.
- air gap means the distance from the lowest portion of the hull of a vessel to the still water line.
- the term “hold station” or the term “holding a vessel in station” means that the vessel has the ability to remain within a 3 meter radius of its position during flotation.
- Elevating Support Vessel is defined as any vessel having at least a hull and deck, at least three jack-up legs capable of extending through the hull and deck, and at least three azimuthing thrusters, wherein the vessel is self propelled.
- the term “light ship” means the weight of the ship including its fixed components such as cranes, engines, and the like apparatus permanently affixed to the vessel.
- full displacement means the light ship weight plus the weight of variable loads and consumables such as fuel, water, deck cargo, personnel and the like objects.
- FIG. 1 illustrates one embodiment of an Elevating Support Vessel 100 .
- the Elevating Support Vessel 100 has a hull 103 , a deck 106 , a crane support 109 , a crane 112 , a sub-base structure 115 , a base structure 118 , a work-over rig 121 , three thrusters 124 , 127 , and 130 , three jack-up legs 133 , 136 , and 139 , and three spud cans 134 , 137 , and 140 ; however, due to the position of the Elevating Support Vessel 100 only two thrusters 124 and 130 , two jack-up legs 133 and 139 , and two spud cans 134 and 140 , are shown.
- FIG. 1 also illustrates the above-defined orientations, wherein H is the horizontal axis, V is the vertical axis, and D is the depth axis.
- FIG. 2 is a top-down view of the Elevating Support Vessel 100 , and illustrates the locations of the three thrusters 124 , 127 , and 130 and the three jack-up legs 133 , 136 , and 142 .
- the hull 103 of the Elevating Support Vessel 100 may be thought of as subdivided into five sections: a transom section 142 , a sloped transom section 145 , a center section 147 , a sloped bow section 150 , and a bow section 153 .
- a transom section 142 Preferably, at least a portion of the lower side of the transom section 142 is flat.
- a portion of the lower side of the bow section 153 is flat.
- thrusters 124 , 127 , and 130 may be mounted, respectively, to the flat lower sides of the transom section 142 and bow section 153 .
- the transom section 142 and the bow section 153 are of a relatively thinner depth than the center section 147 .
- the transom section 142 and the bow section 153 are at least half as deep as the center section 147 .
- the center section 147 may be of a uniform curvature or generally flat.
- the center section 147 has additional slopes (not shown) to accommodate the spud cans 134 , 137 , and 140 .
- the beta slope is preferably of an angle lesser than the alpha slope. In this manner, the beta slope acts as a transition slope between the alpha slope and gamma slope, and reduces the stress on the hull. In an embodiment, the beta slope is between about 10 and about 15 degrees, and preferably about 13 degrees.
- the gamma slope is preferably of an angle lesser than the beta slope. In this manner, the gamma slope acts as a transition slope between the beta slope and the center section 147 , and reduces the stress on the hull. In an embodiment, the gamma slope is between about 5 and about 10 degrees, and preferably about 6 or about 7 degrees.
- two of the azimuthing thrusters 124 and 127 are mounted to the underside of the transom section 142 and along the horizontal axis behind the two rear jack-up legs 133 and 136 .
- the two rear azimuthing thrusters 124 and 127 may be mounted along the vertical axis of the transom section 142 in a position to avoid the turbulence created by the drag of the rear jack-up legs 133 and 136 , and give the greatest maneuverability to the Elevating Support Vessel 100 .
- the bow of the Elevating Support Vessel 100 is widened—with respect to the configuration shown in FIG. 2 —along the vertical axis to such that two front azimuthing thrusters may be mounted parallel along the vertical axis.
- the bow is also widened such that each of the front azimuthing thrusters may be mounted to the bow of the Elevating Support Vessel 100 , along the vertical axis, such that their exhaust straddles the front jack-up leg 139 .
- the two front azimuthing thrusters are preferably mounted to the bow of the Elevating Support Vessel 100 , along the horizontal, at a generally front-most location.
- a crane-support column 165 is connected at one end to the crane-support platform 162 .
- the crane-support column 165 is welded into the center of the crane-support platform 162 .
- the crane 112 is rotatably affixed to the other end of the crane-support column 165 .
- rotatably affixed it is meant that the connection between the crane 112 and the crane-support column 165 permits the crane 112 to rotate about the radius of the crane-support column 165 from a first location to a second location.
- the tracks 156 are spaced apart from one another, along the vertical axis, at a distance such that there is room to store a variety of equipment and things beneath the crane-support platform 162 and between the tracks 156 .
- the tracks 156 may be about 10 meters apart, along the vertical axis, alternatively about 15 meters apart, alternatively about 20 meters apart, alternatively about 25 meters apart.
- the tracks 156 must be sturdy to carry the weight of the crane-support 109 , crane 112 , and load. Accordingly, the tracks 156 preferably extend through the entire depth of the transom and are integral with the Elevating Support Vessel 100 . Applicants believe, without wishing to be bound by the theory, that the tracks 156 absorb little to no dynamic moments or forces. Instead, the connection between the crane-support legs 159 and the track 156 permits the forces to be distributed in simple static directions.
- the connection between the track 156 and the crane-support legs 159 is described with reference to FIG. 5 .
- the crane-support legs 159 may be secured to crane-leg shoes 168 .
- the track 156 may be of a general T-shape, wherein the post of the T extends through the transom 142 of the deck 106 .
- the top of the T-shaped track 156 is in communication with the crane-leg shoe 168 , which is of a female shape designed to fit about the top of the T-shaped track 156 . There must be enough space between the top of the T-shaped track 156 and the crane-leg shoe 168 such that the crane support 109 may slide along the track.
- the sub-base structure 115 has at least one brace 171 , preferably two braces, and a sub-base support structure 174 .
- the braces 171 are preferably designed to be pinned on the transom in vertical alignment with the tracks 156 . In this manner, the braces 171 are pinned to the most reinforced section of the Elevating Support Vessel's 100 transom. Likewise, the rear of the transom of the Elevating Support Vessel 100 is designed to engage the pins of the brace 171 .
- the braces 171 are secured along a point on the depth axis which allows the top of the brace 171 to be flush with the deck 106 .
- the vertical length of the sub-base support structure 174 is preferably defined by the width of the tracks 156 because the brace 171 is preferably designed to be pinned in vertical alignment with the tracks 156 .
- the work-over rig 121 is preferably skidable in the horizontal direction along the braces 171 . In this manner, the work-over rig 121 may be secured at any point along the horizontal axis of the sub-base support structure 174 within about 1 to about 3 meters, alternatively within about 1 to about 2 meters, from the transom.
- the work-over rig 121 is deployed without the need for a cantilever or outrigger system, which takes up valuable space on the deck 106 .
- the crane 112 is used to assemble the sub-base structure 115 , base structure 118 , and work-over rig 121 on the transom of the Elevating Support Vessel 100 .
- the crane 112 is used to lift the sub-base structure 115 , and used in the assembly of the sub-base structure 115 to the rear of the transom.
- the crane 112 is then used to lift the base structure 118 , and used in the assembly of the base structure 118 to the sub-base structure 115 .
- the crane 112 is then used to lift the work-over rig 121 and used in the assembly of the work-over rig 121 to the base structure 118 .
- the sub-base structure 115 may be secured on a satellite structure outside of the Elevating Support Vessel 100 .
- the satellite structure is an oil or gas platform.
- the satellite structure preferably has tracks which the sub-base structure 115 may be fitted to engage, and an opening through which the work-over rig 121 may work.
- the sub-base structure 115 and the tracks of the satellite structure engage each other in a manner similar to the engagement between the crane tracks 156 and the crane-support legs 159 , as described above with reference to FIG. 5 .
- the crane 112 is used to assemble the sub-base structure 115 , base structure 118 , and work-over rig 121 on the transom of the Elevating Support Vessel 100 .
- the crane 112 may be employed to disassemble the sub-base structure 115 , base structure 118 , and work-over rig 121 by the reverse process as just described.
- the crane 112 also preferably disassembles the sub-base structure 115 , base structure 118 , and work-over rig 121 in less than about 15 lifts, preferably less than about 10 lifts, and alternatively less than about 5 lifts.
- any number of the azimuthing thrusters may be in signal communication with a computer, and any number of the azimuthing thrusters may be in signal communication with each other and/or the computer.
- the Elevating Support Vessel 100 may remain within about a three meter radius from the set point. The ability to hold station is especially important while the legs are being lowered to the sea/ocean floor until the Elevating Support Vessel 100 is supported by its jack-up legs.
- the Elevating Support Vessel 100 can hold station, using only the azimuthing thrusters, in a current of between 0 to about 3 knots.
- the Elevating Support Vessel 100 holds station during deployment of the jack-up legs, there may be forces acting on the jack-up legs, such as undercurrents. In such situations, the net forces acting on the Elevating Support Vessel 100 is called the effective current, and the Elevating Support Vessel 100 can preferably hold station in an effective current of between 0 to about 3 knots. In these embodiments, the surface current may or may not be above about 3 knots.
- a first anchor is connected to one end of the Elevating Support Vessel's 100 bow
- a second anchor is connected to the opposite end of the Elevating Support Vessel's 100 bow
- a third anchor is connected to one end of the Elevating Support Vessel's 100 transom
- a fourth anchor is connected to the opposite end of the Elevating Support Vessel's 100 transom.
- the azimuthing thrusters are used to correct for any deviation should the Elevating Support Vessel 100 deviate from its set point.
- the azimuthing thrusters are put to greater use in a two-point mooring system than in a four-point mooring system.
- the use of one, three, and greater than four anchors is also contemplated.
- the location selected does not contain pits caused by previous jack-up vessels, commonly referred to as “can holes”, debris, pipe ties, or other obstructions.
- can holes debris, pipe ties, or other obstructions.
- the ROV may be an unmanned submersible.
- the ROV can dive below the surface of the water and obtain detailed images of the sea floor using a side acoustic scanner and/or bottom contour sonar, and the like equipment.
- the ROV may have a range of from about 30 meters to about 300 meters, or more, which may permit the Elevating Support Vessel 100 to remain at a distance further away from the platform such as at least about 30 meters, alternatively at least about 50 meters, alternatively at least about 100 meters.
- the ROV has an umbilical cord that carries power to it, as well as electrical signals and data to and from the Elevating Support Vessel 100 .
- the ROV can be remotely controlled.
- the reach of the Elevating Support Vessel's 100 onboard skiddable crane permits the Elevating Support Vessel 100 to select a position further away from the platform than previously possible.
- the Elevating Support Vessel 100 is located and jacked-up between about 7 and about 14 meters from the edge of the platform, alternatively from about 15 meters to about 20 meters, and alternative at most about 23 meters from the edge of the platform.
- the Elevating Support Vessel 100 is moved to a location such that its arm is within reaching distance from the single well conductor pipe. Preferably the reaching distance is less than about 6 meters.
- the jack-up legs of the Elevating Support Vessel 100 are lowered until they are pinned, i.e., just touching the sea/ocean floor. During this operation, the methods of holding station, as described above, may be implemented. Once the jack-up legs of the Elevating Support Vessel 100 are pinned, the arm of the Elevating Support Vessel 100 extends to hold the single well conductor pipe. The jack-up drilling rig releases the single well conductor pipe and is tugged away from location.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/079,362 US20080247827A1 (en) | 2007-03-30 | 2008-03-26 | Work-over rig assembly and methods thereof |
Applications Claiming Priority (3)
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US92092307P | 2007-03-30 | 2007-03-30 | |
US3081508P | 2008-02-22 | 2008-02-22 | |
US12/079,362 US20080247827A1 (en) | 2007-03-30 | 2008-03-26 | Work-over rig assembly and methods thereof |
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US20080247827A1 true US20080247827A1 (en) | 2008-10-09 |
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US12/079,362 Abandoned US20080247827A1 (en) | 2007-03-30 | 2008-03-26 | Work-over rig assembly and methods thereof |
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WO (1) | WO2009027825A2 (fr) |
Cited By (31)
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US20080229524A1 (en) * | 2005-08-01 | 2008-09-25 | The Engineering Business Limited | Gangway Apparatus |
US20080237175A1 (en) * | 2007-03-30 | 2008-10-02 | Remedial (Cyprus) Pcl | Extension assemblies and methods thereof |
US20080237170A1 (en) * | 2007-03-30 | 2008-10-02 | Remedial (Cyprus) Pcl | Extension Bridges and methods of tender assist |
US20080237171A1 (en) * | 2007-03-30 | 2008-10-02 | Remedial (Cyprus) Pcl | Methods of positioning an elevating support vessel |
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US20080237173A1 (en) * | 2007-03-30 | 2008-10-02 | Remedial (Cyprus) Pcl | Arm assembly and methods of passing a pipe from a first vessel to a second vessel using the arm assembly |
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WO2009027825A2 (fr) | 2009-03-05 |
WO2009027825A3 (fr) | 2009-08-06 |
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