Design Portfolio

Offshore and Maritime Design

Since our start in 2007, Bassoe Technology has developed a large number of mobile offshore units, and floating production units, RoPax ferries and expedition cruise ships for customers all over the world. Our designs are technically optimized, purpose designed, efficient and safe. Increased transit speed, excellent DP capabilities and higher performance characteristics are some of our key design features. So far, six of our units have been built and delivered, on time and on contracted deck payload capacity.

Accommodation Units

Bassoe Technology BT-4900N

Bassoe Technology has developed a series of new generation dynamic positioned semi-submersible accommodation units setting new standards for offshore accommodation. In an increasingly competitive labor market, our units offer attractive and comfortable living standards for the offshore workforce. All units have large open deck storage areas as well as covered workshops and client stores. An efficient hull and pontoon geometry - with a resistance 50% lower than traditional/competing semisubmersible accommodation units - results in superior transit speed. Our design portfolio includes accommodation units for various operational areas, such as West of Africa, Gulf of Mexico, offshore Brazil, North Sea UK and North Sea Norway.

Bassoe Technology Accomodation Unit
Attractive and Comfortable Offshore Living

Bassoe Technology's accommodation units are designed for about 500 persons and offer attractive and comfortable offshore living standards and high quality off-time. The architect designed living quarters provide high quality single-berth cabins, spacious recreation areas for sport activities, spa facilities and auditorium for entertainment and training. All cabins and public areas have natural daylight.

Hi Gangway Up-Time

An improved gangway interface allows for flexible operations along different types of host installations with varying landing heights, such as fixed platforms and various floating platforms, including FPSOs in challenging environmental conditions.

High Focus on Safety

Bassoe Technology's accommodation units have been developed with a high focus on safety. Personnel safety during transport of people between the accommodation unit and the host platform is achieved by a passage inside the deck box to the gangway tower and a sheltered gangway to/from the host platform. Lifeboats are located opposite to the host installation, and are protected by the living quarters.

An optimized hull geometry and a large airgap ensures high gangway up-time, positive airgap at all time and helicopter operations availability even in the harshest environments, such as the Northern North Sea and West of Shetland area. The Bassoe Technology design also allows for operation in low temperature areas.

To improve safety of crane operations, all material handling including galley provision containers is made with direct line of sight for the crane operator.

Thanks to an innovative arrangement of the air intake and exhaust pipes, which are located away from the host installation, the DP downtime in case of potential hazardous gas release on the host installation is minimized.



Arctic Units

Based on Bassoe Technology’s employees experience and involvement in the design of ice-breaking vessels as well as state of the art offshore drilling and production units, Bassoe Technology has developed an arctic drillship and a arctic semi-submersible concept.

BT Arctic Drillship

Bassoe Technology Arctic Drillship

The BT-ADS is a drillship design for “un-assisted” drilling operations in heavy ice conditions. The purpose of the hull design is to provide a unit for both arctic conditions and open water operations in harsh wave conditions.

The fully encludes drilling topside have been developed for extremely cold conditions to protect personnel and equipment.

The ice-breaking hull is based on the swedish icebreaker Oden experience and recent performance of double-ended vessels, i.e. one end for operation in ice and one end for operation in open water waves.

BT Arctic Semi-Submersible

BT Arctic Semi is a semi submersible-suitable for drilling and production operations in heavy ice conditions. The concept shall be operational in shallow waters including sitting on the sea floor.

BT-5000 Midwater Drilling Semi

Bassoe Technology BT-5000 LWO

The BT-5000 MWS (Midwater Semi) is Bassoe Technology's drilling semi-submersible for operations in moderate to harsh environmental conditions. It is intended to replace an aging fleet of midwater drilling units and in the same time, it takes the development further by offering a drilling tool with excellent motion characteristics and an arrangement that allows for a fast change over between different modes of operation for the UK North Sea.

Maximum Operational Efficiency

The BT-5000 MWS has an optimized hull configuration which gives it excellent motion characteristics without compromising station keeping performance, transit loads and towing forces. This leads to a higher workability for critical operations. Together with the arrangement of the unit, which allows for maximized preparations off the critical path, a very high level of efficiency is reached.

Safe and Cost-Efficient Structural Configuration

The structural configuration of the BT-5000 MWS is both robust and proven. Redundant structural members increase safety as do the buoyant upper hull deck-box by providing reserve buoyancy in case of large heel accidents.

Furthermore, the structural configuration of the BT-5000 MWS is recognized to be cost efficient during construction and as it has a minimum of bracings and critical fatigue sensitive hot-spot the risk for fatigue cracks and inspection is reduced.

Operations

The BT-5000 MWS is designed for both exploration and production drilling with a special focus on completion operations thanks to the introduction of large cellar deck areas around the moon-pool for handling of various subsea related equipment, such as BOP stack, X-mas trees, various umbilical reels and an upper deck layout designed to include ample space for various third party equipment. The drill-floor area has been designed to allow a quick change over between different drilling activities with dedicated areas for pre-rigging of coiled tubing and other third party equipment.

Optional Equipment and Outfitting

The BT-5000 MWS is in its basic version arranged with the equipment required to provide a cost efficient drilling tool but the Unit can also be tailor designed to meet specific owner preferences and requirements with regard to optional equipment and outfitting. The basic version is arranged with a 8-line chain mooring system with four thrusters intended for self-contained thruster assisted mooring up to 500/610 m (1,640/2,000 ft, harsh/moderate environments) water depth and with wire or polyester mooring-line inserts the Unit will be able to carry out drilling operations in up to 1,500 m (5,000 ft). The Unit is also pre-arranged for a 12-line mooring system for operations in hurricane/cyclone prone areas where thruster assist cannot be used.

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DSME6000M and DSME7000 DP Deepwater Drilling Semis

DSME, the world leading offshore and shipbuilding company, sourced the development of the new DSME6000M DP-2 deepwater drilling unit to Bassoe Technology in mid 2009. The development was based on the 2008 Petrobras ITT for Brazil operations.

The DSME6000M mild environment unit is designed for operations in water depths up to 2,438 m (8,000 ft) and drilling depths up to 35,000 ft with a deck and column payload of 6,000 tonnes.

The work was a joint project where Bassoe Technology defined the hull and developed a technical specification including General Arrangement, Marine, HVAC and Drilling flow sheets and single line diagram. Bassoe Technology also performed motion and station keeping analyses, weight and stability analyses, as well as loading conditions for the unit. DSME developed structural drawings and supporting analyses for receiving an ABS AIP approval.

In discussions with clients 2010, requests for meeting the latest GOM requirements were presented. DSME asked Bassoe Technology to design a new hull for a DSME7000 DP-3 ultra deepwater drilling unit and also to develop a General Arrangement and perform motion and station keeping analyses, loading condition calculations, a DP-3 single line diagram and updated flow sheets to enable a tender bid. For more information, see Projects or download brochure here.

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BT-7000 DP Ultra Deep Water Drilling Semi

Bassoe Technology BT-7000 Ultra Water Drilling Semi Submersible

The Bassoe Technology 7000 (BT-7000) is a dynamic positioned (DP) ultra deepwater drilling unit for efficient and safe operations in mild environmental conditions, such as Brazil, Gulf of Mexico, South East Asia and West Africa.

Bassoe Technology have developed a range of cost optimized DP deepwater drilling semi-submersibles for efficient and safe drilling in harsh as well as moderate environmental conditions.

The BT-7000 DP mild environment unit is built for operations in water depths up to 2,400 m (7,880 ft) and drilling depths up to 30,000 ft. However, the design is developed to allow for a maximum operational water depth of 3,050 m (10,000 ft) and drilling depths of 40,000 ft.

Bassoe Technology BT-7000

Station keeping is achieved by a DP system according to ABS DPS-2 requirements, including 8 x 3,300 kW thrusters. With relatively small modifications, the arrangement can be redesigned to meet ABS DPS-3 requirements. Basic design including structural drawings, global performance analyses, flow sheet and layout drawings for machinery and utility systems and drilling systems are being provided for an early fabrication start. Bassoe Technology have developed a Technical Contract Specification for DSOC for signing a contract between the shipyard and a drilling contractor.

For more information and detailed technical specification download brochure here.

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BT-9000 DP Harsh Environment Drilling Semi

The BT-9000 is a harsh environment DP-3 unit with a VDL of 9,000 tonnes for 10,000 ft water depth. The Unit can be arranged with a single derrick for harsh environment operations and can be arranged with a dual activity derrick in moderate environments.

BT-12000 DP/Moored Harsh Environment Dual Activity Drilling Semi

The BT-12000 DP/Moored Dual Driller is an ultra deepwater, North Sea harsh environment combined dynamic positioned (DP-3) and moored drilling unit with dual activity drilling facilities. The BT-12000 is designed for drilling one well and simultaneous completion of a second well in water depths up to 3,650 m (12,000 ft) and drilling depth of 45,000 ft. Dual activities also enable simultaneous drilling of two wells in up to 1,828 m (6,000 ft). The unit is designed for a 12,000 tonnes variable deck payload capacity.

The BT-12000 is a two pontoon, four column unit with a deck box structure. The lower hull is connected with wing pontoons forward and aft.

BT-MDS Medium Size Drillship

Bassoe Technology Medium Size drillship

The Bassoe Medium Size Drillship (BT-MDS) is a Dynamic Positioned vessel designed for efficient and safe drilling operations in Gulf of Mexico, offshore Brazil, West of Africa and South East Asia in water depths up to 2,600 m (8,500 ft) and drilling depths of 40,000 ft (12,190 m). The design has been further developed to allow for a maximum water depth of 3,050 m (10,000 ft).

The BT-MDS is designed with a beam of 32.20 m (105’-8”) to meet the maximum requirement of Panamax sized vessels. With a length of 184.55 m (605’-6”), the vessel has a displacement of 53,700 tonnes and a payload of 20,000 tonnes.

The main objective for the design is a purposed designed, robust vessel includes a high degree integration of drilling equipment into the hull, with a simple, easy layout to inspect and maintain.

The arrangement of the vessel includes an accommodation for 184 people with a galley and mess for serving half crew in one seating. Forward of the moon pool area is the riser storage located in a hatch-less hold supported by two knuckle-boom cranes and a catwalk machine. Aft of the moon pool is the drill pipe storage located on upper deck, supported by two knuckle-boom cranes.

A large, 41.60x 11.20 m (136’-6” x 36’-9”), moon pool is located amidships. Above the moon pool is a drill floor and substructure arranged supporting a 210 ft derrick.

Station keeping for the BT-MDS is achieved by a DP system in accordance with IMO requirements for DP Class 2 vessel, including 6 thrusters, 2 large thrusters aft and 4 retractable thrusters amidships/forward. The power generation plant in two engine rooms includes six gen sets of 5,500 kWe each, total of 33.0 MWe. Transit speed is achieved using the two aft thrusters with the remaining 4 thrusters retracted into the hull.

The vessel can be modified to meet IMO requirements for a DP class 3 vessel, dividing the power plant in three engine rooms.

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BT-UDS Ultradeepwater Drillship

Bassoe Technology Ultra Deepwater drillship

The BT-UDS (Ultra Deepwater Drillship) is a 75,400 tonnes displacement dynamic positioned drillship developed by Bassoe Technology for drilling of wells down to 12,190 m (40,000 ft) in water depths up to 3,650 m (12,000 ft). It is designed for efficient development drilling and completion operations as well as for traditional exploration drilling in offshore Brazil, Gulf of Mexico, South East Asia and West of Africa. It is designed for maximum operational flexibility, with high DP station keeping capability and high transit speed.

A Maximum of Efficiency and Operational Flexibility

The BT-UDS is designed for exploration and production drilling, completion operations, workover and intervention operations. The drilling area, developed in close cooperation with Skeie Technology, is designed for maximum efficiency and a minimum of down-time, with off-line preparation of next coming operations and rigging of various equipment, such as casing strings, down-hole assemblies and coiled tubing assemblies. This, together with a large free moon pool area for handling and stacking of multiple X-mas trees (up to 12 trees can be stored onboard), handling of subsea umbilicals and related reels, as well as storage of various third party equipment and containers, will make the drillship specifically well suited for development drilling.

Zero Discharge

The BT-UDS has been designed for zero discharge to allow operations in environmentally sensitive areas. Special emphasis has been placed on drain collection to minimize the risk for spillage of liquids into the sea and the BT-UDS features a state-of-the-art drain treatment system.

Improved Storage Capacity

The mud system features large storage capacity with three segregated systems having dedicated pits, tanks and pumps for oil-based mud, water-based mud as well as completion fluids.

High Performance – Small Size

The BT-UDS, with a length and breadth of 228 x 38 meter, which is smaller or similar as competing designs, will have a payload of 25,000 tonnes which is above competing designs. This has been achieved by effective utilization of its hull with integrated riser storage and mud handling. The vessel has space for six mud pumps.

Superior Transit Speed

Six 5.0 MW azimuthing thrusters together with the Bassoe Technology developed and model tested hull-form will provide a transit speed up to 16 knots, which is higher than competing designs, allowing faster and more efficient mobilization between drilling locations.

Reduced Environmental Footprint

The BT-UDS combines DP Class 3, which is the highest redundancy dynamic positioning class, a highly efficient twin-skeg hull and a well developed drain philosophy. It also features DNV’s class-notation for Enhanced Reliability, DYNPOS-ER, which leads to more effective utilization of the six diesel generators. Altogether, this leads to a reduced environmental footprint.

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For more information, see Projects.

SWS 12000

Bassoe Technology SWS 12000 at sea

Bassoe Technology has developed a 70,000 tonnes displacement ultra deep water drillship for the Chinese yard Shanghai Wangaoqiao Shipbulding Co., Ltd. The SWS-12000 is a dynamic positioned vessel designed for efficient and safe drilling operations defined for Gulf of Mexico, offshore Brazil, West of Africa and South East Asia in water depths up to 3,660 m (12,000 ft) and drilling depths of 40,000 ft (12,190 m).

The vessel is arranged with a dual activity drilling facility with two drill centers. The load path for the forward main drill center is 1,250 s tons and 1,000 s tons for the auxiliary drill center located aft. The large moon pool can be accessed from two sides, the BOP and risers from forwards side and X-mas trees and drill pipes from aft side of the moon pool.

The SWS-12000 is designed with a length of 228.6 m (750’-0”) and a beam of 36.0 m (118’-1”). The vessel has a displacement of 70,250 tonnes and a payload of 22,000 tonnes.

The main objective for the design is a purposed designed, robust vessel includes a high degree integration of drilling equipment into the hull for exploration and appraisal drilling, production drilling, completion and work over operations.

The arrangement of the vessel includes an accommodation for 212 people with a galley and mess for serving half crew in one seating. The riser storage is located in a hatch-less hold forward of the moon pool, supported by two knuckle-boom cranes and a catwalk machine. The drill pipe storage located on upper deck aft of the moon pool is supported by two knuckle-boom cranes and a catwalk machine.

A large, 37.6 x 12.8 m (123’-4” x 42’-0”), moon pool is located amidships. Above the moon pool is a drill floor and substructure arranged supporting a 210 ft dual derrick.

Station keeping for the BT-MDS is achieved by a DP system in accordance with IMO requirements for DP Class 3 vessel, including six 4.5 MW thrusters. The power generation plant in three engine rooms includes six gen sets of 7.3 MWe each, total of 43.8 MWe.

For detailed technical specification please download the SWS-12000 brochure here.

For more information, see Projects.

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BT Production Semi-Submersible

Bassoe Technology Production Semi Submersible

Employees at Bassoe Technology (BT) have experience and have been involved in some of the world’s largest floating production unit (FPU) projects for operations in harsh environment North Sea conditions and extreme hurricane conditions in Gulf of Mexico. Based on this experience BT has been involved in Norwegian continental shelf PFVs and deep draught units for worldwide operations.

For Norwegian operations a 53000 tonnes displacement FPU for a 75000 BOP productions facility and flexible risers have been developed. The overall concept design performed by Bassoe Technology includes hull, global performance, marine systems, machinery systems and top side layout.

Bassoe Technology has performed a basic design of a deep draft semi together with Technip. The design have been approved by ABS and received an AIP from ABS.

The Semi have been model-tested to confirm the excellent motion performance shown in the motion analysis report.

Tender Support Units - The TAD Concept

The TAD (Tender Assist Drilling) concept allows a substantial part of the drilling facilities, and all supporting facilities, to be located onboard the Tender Support Unit (TAD unit), moored alongside the host platform and only connected with a gangway. This significantly reduces the loads imposed on the host platform, as only a fraction of the required drilling weight is installed on the installation.

TAD brings numerous advantages to a field installation, such as:

  • Reduced weight of the topsides on the host platform as part of the drilling facilities, supporting equipment and drilling fluids are safely arranged on the TAD Unit
  • Reduced loads on the mooring systems of the Spar or TLP platform and thereby increasing their water depth capabilities
  • Larger storage capacities for drilling consumables and fluids due to ample volume, space and variable load capacities for the TAD unit
  • Improved safety as the accommodation facilities for the drilling crew and other working staff are located on the TAD unit, away from hazardous areas
  • Improved evacuation safety in the event of an emergency situation by means of a releasable telescopic gangway on the TAD unit. After releasing the gangway the Tender Drilling Unit can move away from the host platform by controlled release of the mooring lines

BT-3500 TSV Tender Drilling Unit

Bassoe Technology BT-3500 TSV at sea

The BT-3500 TSV is Bassoe Technology's new generation semi-submersible Tender Drilling Unit. Designed to meet a growing demand for cost-efficient tender drilling, the BT-3500 takes self-erecting Tender Assist Drilling (TAD) to a new level, offering higher efficiency and operability in harsher environments and deeper water than previous generations of TAD units.

Large Deck Load Capacities

The BT-3500 TSV is designed with a special focus on large deck load capacities. The deck and column payload capacity in operation and survival conditions is 4,400 tonnes. The total payload in operation and survival conditions is 5,800 tonnes and in transit condition 2,900 tonnes.

Bassoe Technology BT-3500 TSV

Increased Hydrodynamic Performance and Flexibility

The BT-3500 semi-submersible is characterized by its excellent motions and flexibility. A special focus on hydrodynamic performance has led to a unit with increased operability and workability, especially crane operations and gangway handling. The unit's flexibility allows it to be used for various host platforms, such as fixed jackets, Spars and TLPs in water depths up to 2,000 meters (6,600 ft.) in offshore Brazil, Gulf of Mexico, South East Asia and West of Africa.

Improved Safety

The gangway route between the host platform and the BT-3500 leads directly into the deck box of the BT-3500. This means improved safety for the workers since no passage to/from the host facility is on open deck.

Watch Axon Energy Products' Semi-Tender Assist Rig animation here.

For detailed technical data on the BT-3500 TSV please download the brochure here.

For more information about BassDrill Beta, see Projects.

For more information about Atlantica Delta, see Projects.

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BT-HTB Heavy Tender Barge

The BT-HTB is a 115 x 27.4 m ABS approved Tender Drilling Barge. The design is based on the class approved Bassoe Technology designs BT-LTB and BT-MTD. The BT-HTB is a larger, non-propelled barge intended for tender support drilling and workover operations in water depths up to 200 m in benign environmental areas, such as West of Africa and South East Asia. The BT-HTB is moored adjacent to a fixed installation with an onboard installed 8-point wire-rope system.

The BT-HTB is designed to transport a complete derrick set to the location and erect the drilling package on the deck of the fixed installation using a large crane. The unit supports the fixed installation during drilling and workover operations. It contains drilling liquid mud in pits, bulk and cementing storage and handling facilities, pipe and tubular storage which are supplied to the derrick set during operations.

The BT-HTB accommodates 140 people with corresponding catering and safety facilities onboard.

For detailed technical data on the BT-HTB please download the brochure here.

For more information, see Projects.

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BT-MTB Medium Tender Barge

Construction of Bassoe Technology Medium Tender Barge

BT-MTB is a non-propelled Medium size Tender Drilling Barge intended for drilling and workover operations in water depth between 5 to 200 m in areas with benign environmental conditions, such as West of Africa and South East Asia.

Based on the class approved Light Tender Barge design, Bassoe Technology has developed the Medium Tender Barge (BT-MTB) with increased space and capacities. The BT-MTB is designed to transport, erect and support a Derrick Set during drilling and workover operations. The unit will support the derrick set with drilling mud and bulk handling facilities, cementing facilities, pipe and tubular storage. The BT-MTB is moored with an onboard 8-point wire-rope system with the stern towards the fixed installation to facilitate both erection of the drilling set onto the fixed installation as well as transfer equipment and fluids during drilling and workover operations. The BT-MTB is designed to accommodate up to 112 people onboard.

Bassoe Technology has performed a basic design for the unit with a full class approval by ABS in accordance with class notation +A1 Barge, Unrestricted Services.

For more information, see Projects.

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BT-LTB Light Tender Barge

Bassoe Technology Light Tender Barge at sea

BT-LTB is a non-propelled Medium Size Tender Drilling Barge intended for drilling and workover operations in water depth from 5 m to 200 m (15 to 650 ft) in areas with benign environmental conditions like West of Africa and South East Asia.

The BT-LTB is designed to transport, erect and support a Derrick Set during drilling and workover operations. The unit will support the derrick set with drilling mud and bulk handling facilities, cementing facilities, pipe and tubular storage. The BT-LTB is moored with the stern towards a fixed installation with an 8-point wire-rope mooring system. This enables both erection of the drilling set onto the fixed installation using the large crane as well as providing equipment and fluids during drilling and workover operations. The BT-LTB is designed for accommodation of up to 100 people onboard.

Bassoe Technology has performed a basic design for the unit with a full class approval by ABS in accordance with class notation +A1 Barge, Unrestricted Services.

Model tests were performed for the BT-LTB in March 2008.

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BT-4000 Light Workover Unit

Bassoe Technology BT-4000 Light Workover Unit

The BT-4000 LWO (Light Workover Unit) is a 32 600 tonnes displacement dynamic positioned semi-submersible developed by Bassoe Technology for light workover and well intervention operations in water depths up to 2400 m (7 879 ft) in offshore Brazil, Gulf of Mexico, West of Africa and South East Asia. It is designed for efficient and fast change-over between various well intervention operations with maximized preparations off the critical path.

The BT-4000 has an optimized hull for motion and transit performance and is designed for a variety of workover operations, such as:

  • Coiled tubing and wire line line/slick line through an open water intervention riser system (high pressure riser up to 10 000 psi) with a surface BOP
  • Through tubing drilling and completion with coiled tubing or optional rotary drilling
  • Top-hole rotary drilling
  • Installation and retrieval of X-mas trees and different subsea equipment
  • Installation and retrieval of electrical submersible pumps in wells and subsea pumping modules
  • Well testing and well clean-up
  • Pumping and circulation of various types of fluids through the workover/completion riser from a well stimulation vessel
  • Well kill
  • Installation, handling and operation of a subsea capping stack
  • ROV operations

Access to Derrick from Three Sides

The BT-4000 has access to the derrick from three sides, which allows different operations to be carried out in parallel.

Improved Operational Efficiency and Safety

The BT-4000 is arranged with a skidding system for handling and transportation of subsea equipment. It accesses the well center from three sides, which, together with the flush drill floor hatch (moonpool door) design improves material handling efficiency and increases safety. A skidding system is also used for transporting the advanced coiled tubing frame to and from the well center, which facilitates pre-stabbing of the coil and testing in advance.

For more information, see Projects.

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