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
  • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
  • E21B15/003—Supports for the drilling machine, e.g. derricks or masts adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells

Definitions

• the present invention relates to an arrangement in connection with drilling and workover of offshore wells, especially with snubbing and coil tubing, and more specifically an arrangement where the rig comprises two rig centres for snubbing and coil tubing operations respec- tively.
• a basic object of the present invention is to provide a modular drilling and workover system involving safer and more efficient snubbing, drilling and coil tubing operation in oil and gas wells.
• Another object of the invention is to provide " subsea type" Quick-Stab Guidefunnels/Locking Connectors between each module and in each corner in order to minimise rig- up/rig-down time and to enhance safety.
• Yet another object of the invention is to provide a rig with two operation centres .
• Yet another object of the invention is to provide a rig where the HWR (snubbing unit) will be installed permanently in one rig centre inside the Rig Structure, installed on a separate Compensation System to allow for a vertical heave movement due to heave or heat expansion and where the HWR is installed in a vertical rail system in order to accommodate multiple stack-up arrangement heights of the blow-out prevention system.
• HWR damping unit
• Still another object of the invention is to provide a rig where equipment for the Coil Tubing operation and tripping of tubulars will be permanently installed.
• Another object of the present invention is to provide a rig which can be positioned in either of the two operation centres .
• Still another object of the present invention is to provide a hang-off structure below the rig in order to hang off tubulars and BOP ' s when the rig shall be shifted between the two operation centres.
• the modular rig have drilling, coil tubing and snubbing capabilities and can also retrieve and install Production Riser and Flow Head/Xmas Trees.
• the rig is prepared for side-track drilling as standardised system components are integrated in the invention.
• the individual rig modules 20 have been designed with «subsea type « Quick-Stab Guidefunnels /Locking Connectors in each corner.
• the unit is designed with two operation centres.
• the Rig is fully automated with remote operation of pipe- handling and snubbing operations.
• the Rig Riser Tension Compensation System will compensate for the movement of the Production Assembly and will also be used for soft landing of Well Control Equipment onto the X as Tree/Flow Tree Assembly and also for landing of production riser into the template.
• the HWR (snubbing unit) will be installed permanently in- side the Rig Structure and is installed on a separate
• the HWR is installed in a vertical rail system in order to accommodate multiple stack-up arrangement heights .
• the Rig has an Automated Pipehandling System which serves both the HWR (Snubbing) and the handling of Production Riser and Tubulars from the Tubular Tripping Centre.
• the Automated Pipehandling System will accommodate vertical rig heave .
• a Tubular Feeder Table transports the pipe from the Pipe Rack and to the Rig.
• a Production Riser trolley For transport of Production Riser to and from the Rig, a Production Riser trolley will be installed onto the Tubular Feeder.
• the Tubular Feeder is sectioned and designed to feed tubulars to the Rig in all positions.
• the rig will be installed directly onto the Skid Frame and has been designed to enable skidding in both directions longitudinally and transverse.
• Figures 1A and IB illustrate a front and a side view, respectively, of the rig installed on the associated skidding structure.
• Figure 2 illustrate a 3D view of the rig
• Figure 3 illustrate an ISO view where the components have been extracted.
• Figure 4 illustrate the rig in the HWR (Snubbing) centre.
• Figure 5 illustrate the rig in the Tripping and Coil Tubing Centre .
• Figure 6 illustrate the hang-off arrangement of the BOP's and tubulars when shipting the rig to either position.
• Figure 7 illustrate the pipe and tubular handling arrangement .
• Figure 8 illustrate the compensation system of the BOP's and HWR (snubbing) unit.
• Figure 9 illustrate the operation of coil tubing from the Tubular and Col tubing Centre.
• the system or the arrangement to which the present invention relates can generally be designed as an arrangement to be installed on an oil or gas well.
• the Rig consists of a modulized system.
• structural as well as the functional system is given for the complete invention.
• the Rig (1) is installed on a skidrail system (10) installed to the platform or vessel deck (11) .
• the RSS (2) is equipped with skid jacks (12) to skid the rig along the skid rail (10) to be able to move the rig from the HWR (Snubbing) Centre (13) and to the Tubu- lar and Coil Tubing Centre (14) .
• the RSS (2) forms the base of the Rig (1) .
• skidd (3) Between the Skid Shoes (15), a skiddable Riser Tension Skid (3) is located.
• the skid (3) includes a Dummy Rotary (17) and will always be located directly above the well
• the RSS (2) is built as a framework and is terminated in a skid shoes (15) in each corner and two in the middle, total six, for skidding on the Skid Rail (10) .
• the skid jacks (12) will position the Rig (1) and Riser Tension Skid (3) directly above the Well Centre (16). Af- ter the Riser Tension Skid (3) is locked down in position, the rig (1) is again skidded to either of the two Operation Centres (13 or 14) for the specific rig operation to be performed.
• a Coil Tubing Assembly (18) can be installed in the Tubular and Coil Tubing Centre (14) using the Travelling Assembly (19) .
• the Riser Tension Skid (RTS) (3) is located above the Rig Support Structure (2) and the Skid (3) is supported on the Skid Rails (10) .
• the purpose of the RTS (3) will be to:
• HWR unit (9) performs the drilling operation and tripping of Hook-Load weights above 150mt .
• the Riser Tension Skid (3) will be locked to the main skid rail (10) in a position directly above the well centre (16) .
• the Riser Tensioner Skid (3) has been designed for dual purposes.
• the RTS (3) has integrated Riser Tension Compensation System (21).
• the skid (3) has been designed to support hang-off loads of max. 150 MT.
• the Rig (1) will be skidded to change working centre (13 or 14) . This can be either way i.e. from the Snubbing Centre (13) to the Tripping and Coil Tubing Centre (14) or oppo- site.
• the Riser Tensioner Skid (3) is made of ordinary HEB beams resting of 4 skids shoes (15) .
• the Riser Tensioning System (RTS) (21) will be an inte- grated part of the Riser Tension Skid (3) and has been designed to support all operational loads applied to the Xmas Tree (23) Assembly from the Workover BOP Assy (24) on top of the Xmas Tree (23) .
• the Riser Tensioning System (21) will compensate for the movement of Riser (25) caused by the platform or vessel (11) . Drill Floor Module (4)
• the Drill Floor Module (4) is the lower part of the Rig (1) structure and is resting on top of the Rig Support Structure (2) .
• the structural system of the drill floor (26) is designed to support the following elements:
• Support for HWR Unit Support Structure (8) including extending rails (27) for the pipe handler (28),
• the Lower Rig Structure (5) is installed on top of the Drill Floor Module (4) .
• This structure (5) is designed with an opening (33) wide enough to allow the travelling of the Pipe Handler (28) in the vertical plane.
• the structural system is basically made of Box beams for the legs and Box beams for the lateral bracing system.
• the sides of the Lower Rig Structure (5) is dressed with sheet cladding to provide shelter for wind.
• the Middle Rig Structure (6) is supported by the Lower Rig Structure (5).
• This structure (6) is designed with an opening (33) wide enough to allow the travelling of the Pipe Handler (28) in the vertical plane.
• this structure (6) provides support for walk ways (36) at two levels with landings to the HWR unit (9) as well as spi- ral stairs (37) between levels.
• the Middle Rig Structure (5) consist of a framework with Quick-Stab connections (32),
• the Upper Rig Structure (7) is supported by the Middle
• Rig Structure (6) This structure (7) provides support for walk ways (36) at the top level as well as support for Gin Pole (39) arrangement and Crown Block Assembly
• the HWR Support Structure (8) provides vertical and horizontal support for the complete HWR Assembly (9) .
• a compensating system (21) is located at the top of the support structure (8) . This system will compensate the total load including self weight of the HWR Assembly (9) .
• the HWR Support Structure (8) also provide supports for the rails (27) of the Pipe Handler (28) all the way down to the drill floor (26) .
• the purpose with the Structure (8) will be to:
• HWR Load Compensators (21) to balance the HWR (9) Load.

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

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Publications (1)

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Cited By (10)

Citations (7)

• 1997
  • 1997-11-21 NO NO975344A patent/NO975344D0/no unknown
• 1998
  • 1998-11-20 WO PCT/NO1998/000342 patent/WO1999027222A1/en active Search and Examination

Patent Citations (7)

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