WO2004018826A1 - Subsea drilling module for use in drilling of oil and gas wells - Google Patents

Subsea drilling module for use in drilling of oil and gas wells Download PDF

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Publication number
WO2004018826A1
WO2004018826A1 PCT/NO2002/000292 NO0200292W WO2004018826A1 WO 2004018826 A1 WO2004018826 A1 WO 2004018826A1 NO 0200292 W NO0200292 W NO 0200292W WO 2004018826 A1 WO2004018826 A1 WO 2004018826A1
Authority
WO
WIPO (PCT)
Prior art keywords
drilling
pipe
module
seabed
derrick
Prior art date
Application number
PCT/NO2002/000292
Other languages
French (fr)
Inventor
Per Olav Haughom
Original Assignee
Hansen, Henning
Salte, Jone
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hansen, Henning, Salte, Jone filed Critical Hansen, Henning
Priority to AU2002320716A priority Critical patent/AU2002320716A1/en
Priority to PCT/NO2002/000292 priority patent/WO2004018826A1/en
Publication of WO2004018826A1 publication Critical patent/WO2004018826A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B15/02—Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B19/14—Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole
    • E21B19/143—Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole specially adapted for underwater drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/08—Underwater guide bases, e.g. drilling templates; Levelling thereof
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/12—Underwater drilling
    • E21B7/124—Underwater drilling with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors

Definitions

  • This invention regards a drilling module for use in drilling of oil and gas wells, where the drilling module is equipped and constructed in such a way as to allow it to be placed directly on the seabed, and to allow the drilling operations to be controlled by remote control from a light surface vessel.
  • the equipment used for drilling holes in the earth's crust mainly consists of a drilling derrick formed as a steel truss structure. Hoisting machinery is arranged in the derrick, with a wire for hoisting up and lowering drill pipes. In addition, various equipment is provided for handling the drill pipes and lowering liners into the borehole. When it is necessary to recover the oil and gas deposits from great depths, use is made of floating or fixed installations with mounted equipment. These platforms are large and especially expensive, due to the drilling equipment being large and heavy. In addition to the actual drilling equipment, piping connections (risers) between the platform and the seabed are also required in order to circulate drilling mud during the drilling operation. Floating platforms also require the installation of a heave compensator in order to accommodate wave motion on the platform relative to the seabed.
  • the present invention aims to provide a remote control drilling module that may be placed directly on the seabed to carry out drilling operations.
  • the drilling operations in question are not purely drilling operations for the purpose of extracting oil and gas deposits, but also drilling work to be carried out in connection with plugging of old boreholes, as well as pilot-drilling and observation wells.
  • the use of a drilling module that may be placed on the seabed will also prove relevant for maintenance work in production wells. With the drilling module situated on the seabed, the requirement for surface support is reduced to a smaller ship with a limited lifting capacity.
  • Flexible cables and hoses are arranged between the ship and the drilling module for control/monitoring and circulation of drilling mud to the drilling process.
  • Stands of drill pipe are transported between the drilling ship and the drilling module in cassettes that are put in place in the drilling module by means of remote operated vehicles (ROV) .
  • ROV remote operated vehicles
  • the actual drilling module is equipped with buoyancy elements and is anchored to the seabed with a suction anchor, or against a pre-installed anchor frame.
  • Drilling operations often have to be interrupted under extreme weather conditions, which results in extra costs and hazardous operations. The situation is also dangerous for rig workers who operate the equipment on platforms that are exposed to weather and wave induced stresses.
  • a disadvantageous common feature of known techniques for using floating drilling vessels is the need for large, heavy platforms and expensive structures.
  • a drilling module of this type comprises a drilling derrick structure with vertical guides for a drilling machine for rotation of the drill string, and an associated hoisting mechanism, so as to allow drill pipes connected to the drilling machine to be pulled out of the borehole and also, when required, be pushed down into the borehole during drilling operations.
  • the drilling derrick structure is attached to a quadrangular frame structure with buoyancy elements at each corner, and is also provided with hydraulically adjustable anchors against the underlying steel structure positioned on the seabed.
  • the steel structure is anchored to the seabed by means of a suction anchor.
  • the drilling derrick structure with associated frame structure may also be attached to a standard subsea module where appropriate .
  • the drill string is built up from drill pipe stands that are screwed together with threaded connections.
  • Several pipe stands are stored in cassettes that can be transported between the surface and the drilling module, where they are placed in suitable devices to allow each drill pipe to be handled into the drill string as this is being screwed together or dismantled.
  • Handling of drill pipe stands between the cassettes and a position in the drilling derrick is carried out by a pipe handling device with gripping arms.
  • the drill pipes are screwed together using gripping and rotating means (Roughneck) placed at the bottom of the drilling derrick structure.
  • the drilling module is driven hydraulically with hydraulic pressure from a pumping unit placed in connection with the actual drilling derrick structure.
  • the power supply for operation of the hydraulic unit may be electrical power through a cable from the surface, or by means of a hydroturbine supplied with pressure water through a flexible hose from the surface.
  • Drilling mud used to circulate out drill cuttings is pumped down and back through flexible hose connections from the surface. All operations are controlled and monitored from the surface vessel via flexible cables.
  • Figure 1 shows a schematic diagram illustrating a surface vessel with a drilling module in the lowered position immediately prior to being connected to the foundation frame positioned on the seabed;
  • Figure 2 is a side view of the drilling module with a pipe cassette positioned for insertion into the drilling derrick structure, plus a buoyancy anchor;
  • Figure 3 shows an elevation of the drilling derrick structure with the drilling machine, pipe handling equipment, drill pipe and screw means for screwing and unscrewing drill pipe threads ;
  • Figure 4 shows a basic section through a hose for supply/return of drilling mud, communication and monitoring/control cables.
  • FIG 1 denotes a light surface vessel with mounted hoisting equipment 22, positioned on the surface 23 of the sea directly above the drilling module on the seabed 15.
  • a flexible connection 5 with hoses and control cables extends between the drilling module and the vessel.
  • the pipe cassette 4 is hoisted into place using a wire 1 and hoisting machinery 22.
  • the drilling derrick 10 is connected to the frame 12, which in turn is equipped with buoyancy elements 13 at each corner.
  • the frame 12 is also equipped with anchors 16 that engage fixtures 14 on the foundation frame 24.
  • FIG. 2 shows the drilling derrick 10 with a mounted drilling machine 9 and screw means 11 for screwing together drill pipe stands, and gripping arms 7 for handling pipes.
  • a hydraulic drive unit 20 is positioned in connection with the actual drilling derrick structure 10.
  • the pipe cassettes 4 with frame 3 are provided with buoyancy elements 2 for adjustment of buoyancy.
  • Guiding elements 8 hold the pipe cassettes in place relative to the drilling derrick structure 10.
  • a buoyancy element 6 is arranged on top of the drilling derrick structure for adjustment of buoyancy.
  • the foundation frame 24 is held in place against the seabed by means of suction anchors 17.
  • Figure 3 shows the pipe handling equipment with a vertical structure 19 having mounted gripping devices 7 for transporting drill pipes between the pipe storage 4 and a position in the drilling derrick 25.
  • the pipe handling equipment consist of a vertical structure 19 supported at top and bottom by guides 18, so as to allow the structure 19 to rotate about the vertical axis while at the same time going through a concentric motion about the vertical axis 26 of the drilling derrick.
  • Figure 4 shows a basic section through a supply cable 5 between a surface vessel 21 and the drilling derrick 10.
  • the supply cable is composed of hoses 29 and 30 for supply and return of drilling mud, and also supply 31 of energy to the drilling module.
  • cables 32 for monitoring and control of the drilling module and associated equipment.

Abstract

A drilling module for use in drilling of oil and gas wells, where the drilling module is placed directly on the seabed with energy and control cables (5) supplied from a light surface vessel (21) on the surface (23) of the sea. This is realised by constructing a drilling derrick structure 10 on a frame structure (12) having buoyancy elements (13) arranged in each corner, and with anchors (16) against a frame structure (24) positioned on the seabed (15). On the drilling derrick (10) are arranged hoisting machinery and a drilling machine (9) for hoisting and rotating the drill string. Pipe stands used to assemble a drill string are placed in pipe cassettes (4) that can be transported between the surface and the drilling module. Cassettes of pipe stands are inserted into guide elements (8) on the drilling module. A pipe handling device consisting of a vertical structure (19) with gripping means (7) is provided to facilitate handling of pipe stands between the pipe cassette (4) and the drilling machine (9). The structure (19) is fixed to the frame (12) with guide elements (18).

Description

SUBSEA DRILLING MODULE FOR USE IN DRILLING OF OIL AND GAS WELLS
This invention regards a drilling module for use in drilling of oil and gas wells, where the drilling module is equipped and constructed in such a way as to allow it to be placed directly on the seabed, and to allow the drilling operations to be controlled by remote control from a light surface vessel.
Today, oil and gas deposits in the earth's crust are extracted by drilling holes down to the deposits, so as to allow the oil and gas to be carried up to the surface.
The equipment used for drilling holes in the earth's crust mainly consists of a drilling derrick formed as a steel truss structure. Hoisting machinery is arranged in the derrick, with a wire for hoisting up and lowering drill pipes. In addition, various equipment is provided for handling the drill pipes and lowering liners into the borehole. When it is necessary to recover the oil and gas deposits from great depths, use is made of floating or fixed installations with mounted equipment. These platforms are large and especially expensive, due to the drilling equipment being large and heavy. In addition to the actual drilling equipment, piping connections (risers) between the platform and the seabed are also required in order to circulate drilling mud during the drilling operation. Floating platforms also require the installation of a heave compensator in order to accommodate wave motion on the platform relative to the seabed.
The alternative to drilling from floating drilling platforms is to place the drilling equipment directly on the seabed, thus obviating the need for large expensive platforms. The oil industry today has developed a lot of advanced equipment for remote controlled subsea operations . These are technologies that are available and may be used in a remote control drilling operation in which the drilling equipment is placed directly on the seabed.
The present invention aims to provide a remote control drilling module that may be placed directly on the seabed to carry out drilling operations. The drilling operations in question are not purely drilling operations for the purpose of extracting oil and gas deposits, but also drilling work to be carried out in connection with plugging of old boreholes, as well as pilot-drilling and observation wells. Moreover, the use of a drilling module that may be placed on the seabed will also prove relevant for maintenance work in production wells. With the drilling module situated on the seabed, the requirement for surface support is reduced to a smaller ship with a limited lifting capacity.
Flexible cables and hoses are arranged between the ship and the drilling module for control/monitoring and circulation of drilling mud to the drilling process. Stands of drill pipe are transported between the drilling ship and the drilling module in cassettes that are put in place in the drilling module by means of remote operated vehicles (ROV) . The actual drilling module is equipped with buoyancy elements and is anchored to the seabed with a suction anchor, or against a pre-installed anchor frame.
Drilling operations often have to be interrupted under extreme weather conditions, which results in extra costs and hazardous operations. The situation is also dangerous for rig workers who operate the equipment on platforms that are exposed to weather and wave induced stresses. A disadvantageous common feature of known techniques for using floating drilling vessels is the need for large, heavy platforms and expensive structures.
These problems form the basis of the present invention, the general purpose of which has been to provide a drilling module that may be placed directly on the seabed in order to carry out remote control drilling operations without the use of large, expensive floating drilling platforms. The drilling module should also be designed to carry out maintenance operations in the well and for special drilling in connection with plugging of wells. For said purpose, the invention is characterised by the characteristics stated in the characterising part of the independent claim 1. Advantageous but secondary characteristics that are non-critical to the intended functioning and technical effect of the invention appear from the subsequent dependent claims .
A drilling module of this type comprises a drilling derrick structure with vertical guides for a drilling machine for rotation of the drill string, and an associated hoisting mechanism, so as to allow drill pipes connected to the drilling machine to be pulled out of the borehole and also, when required, be pushed down into the borehole during drilling operations. The drilling derrick structure is attached to a quadrangular frame structure with buoyancy elements at each corner, and is also provided with hydraulically adjustable anchors against the underlying steel structure positioned on the seabed. The steel structure is anchored to the seabed by means of a suction anchor. The drilling derrick structure with associated frame structure may also be attached to a standard subsea module where appropriate .
The drill string is built up from drill pipe stands that are screwed together with threaded connections. Several pipe stands are stored in cassettes that can be transported between the surface and the drilling module, where they are placed in suitable devices to allow each drill pipe to be handled into the drill string as this is being screwed together or dismantled. Handling of drill pipe stands between the cassettes and a position in the drilling derrick is carried out by a pipe handling device with gripping arms. The drill pipes are screwed together using gripping and rotating means (Roughneck) placed at the bottom of the drilling derrick structure.
The drilling module is driven hydraulically with hydraulic pressure from a pumping unit placed in connection with the actual drilling derrick structure. The power supply for operation of the hydraulic unit may be electrical power through a cable from the surface, or by means of a hydroturbine supplied with pressure water through a flexible hose from the surface.
Drilling mud used to circulate out drill cuttings is pumped down and back through flexible hose connections from the surface. All operations are controlled and monitored from the surface vessel via flexible cables.
Non-limiting examples of preferred embodiments of devices designed and constructed in accordance with the present invention are explained in greater detail below with reference to the accompanying drawings, in which:
Figure 1 shows a schematic diagram illustrating a surface vessel with a drilling module in the lowered position immediately prior to being connected to the foundation frame positioned on the seabed;
Figure 2 is a side view of the drilling module with a pipe cassette positioned for insertion into the drilling derrick structure, plus a buoyancy anchor; Figure 3 shows an elevation of the drilling derrick structure with the drilling machine, pipe handling equipment, drill pipe and screw means for screwing and unscrewing drill pipe threads ; and
Figure 4 shows a basic section through a hose for supply/return of drilling mud, communication and monitoring/control cables.
Reference is made to figure 1, where 21 denotes a light surface vessel with mounted hoisting equipment 22, positioned on the surface 23 of the sea directly above the drilling module on the seabed 15. A flexible connection 5 with hoses and control cables extends between the drilling module and the vessel. The pipe cassette 4 is hoisted into place using a wire 1 and hoisting machinery 22. The drilling derrick 10 is connected to the frame 12, which in turn is equipped with buoyancy elements 13 at each corner. The frame 12 is also equipped with anchors 16 that engage fixtures 14 on the foundation frame 24.
Figure 2 shows the drilling derrick 10 with a mounted drilling machine 9 and screw means 11 for screwing together drill pipe stands, and gripping arms 7 for handling pipes. A hydraulic drive unit 20 is positioned in connection with the actual drilling derrick structure 10. The pipe cassettes 4 with frame 3 are provided with buoyancy elements 2 for adjustment of buoyancy. Guiding elements 8 hold the pipe cassettes in place relative to the drilling derrick structure 10. A buoyancy element 6 is arranged on top of the drilling derrick structure for adjustment of buoyancy. The foundation frame 24 is held in place against the seabed by means of suction anchors 17.
Figure 3 shows the pipe handling equipment with a vertical structure 19 having mounted gripping devices 7 for transporting drill pipes between the pipe storage 4 and a position in the drilling derrick 25. The pipe handling equipment consist of a vertical structure 19 supported at top and bottom by guides 18, so as to allow the structure 19 to rotate about the vertical axis while at the same time going through a concentric motion about the vertical axis 26 of the drilling derrick.
Figure 4 shows a basic section through a supply cable 5 between a surface vessel 21 and the drilling derrick 10. The supply cable is composed of hoses 29 and 30 for supply and return of drilling mud, and also supply 31 of energy to the drilling module. In addition, there are cables 32 for monitoring and control of the drilling module and associated equipment.

Claims

C l a i m s
A drilling module for use in drilling oil and gas wells, c h a r a c t e r i s e d i n that the drilling module consisting of a drilling derrick structure (10) with associated drilling machine (9), pipe handling (7), (19) and storage for drill pipes (4), is placed directly on the seabed against an anchor frame (24).
Drilling module according to claim 1, c h a r a c t e r i s e d i n that guides (8) for securing pipe cassettes (4) are provided on the drilling derrick ( 10) .
Drilling module according to claims 1 and 2, c h a r a c t e r i s e d i n that the drilling derrick (10) is mounted to a frame (12) having buoyancy elements (13) in each corner.
Drilling module according to claims 1, 2 and 3, c h a r a c t e r i s e d i n that the frame (12) is equipped with anchors (16) that engage gripping means (14) on the foundation frame (24) positioned on the seabed ( 15) .
Drilling module according to the preceding claims, c h a r a c t e r i s e d i n that a connection ( 5 ) extends between the drilling derrick (10) and a surface vessel (21), incorporating hoses (29), (30) for supply and return of drilling mud, supply of energy (31), and also monitoring and control cables (31).
PCT/NO2002/000292 2002-08-22 2002-08-22 Subsea drilling module for use in drilling of oil and gas wells WO2004018826A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002320716A AU2002320716A1 (en) 2002-08-22 2002-08-22 Subsea drilling module for use in drilling of oil and gas wells
PCT/NO2002/000292 WO2004018826A1 (en) 2002-08-22 2002-08-22 Subsea drilling module for use in drilling of oil and gas wells

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NO2002/000292 WO2004018826A1 (en) 2002-08-22 2002-08-22 Subsea drilling module for use in drilling of oil and gas wells

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WO2004018826A1 true WO2004018826A1 (en) 2004-03-04

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WO2007004887A1 (en) 2005-07-05 2007-01-11 Seabed Rig As Drilling rig placed on the sea bed and equipped for drilling of oil- and gas wells
WO2007108696A1 (en) * 2006-03-20 2007-09-27 Seabed Rig As Drilling rig situated on the seabed, including a separation device
WO2007108698A1 (en) * 2006-03-20 2007-09-27 Seabed Rig As Tool handling device in a drilling rig situated on the seabed
WO2007108697A1 (en) * 2006-03-20 2007-09-27 Seabed Rig As Sealed pipe coupling unit for a drilling rig device situated on the seabed
EP1914379A1 (en) * 2006-10-19 2008-04-23 Adel Sheshtawy Underwater seafloor drilling rig
WO2008100149A1 (en) * 2007-02-14 2008-08-21 Seabed Rig As Method and device for erecting a drill rig on a sea bed
US7584796B2 (en) * 2002-04-30 2009-09-08 Coupler Developments Limited Drilling rig
EP2147182A1 (en) * 2007-04-20 2010-01-27 Seabed Rig AS A method and a device for intervention in an underwater production well
US7735561B2 (en) * 2007-03-01 2010-06-15 Chevron U.S.A. Inc. Subsea adapter for connecting a riser to a subsea tree
GB2470763A (en) * 2009-06-04 2010-12-08 Lance Stephen Davis Underwater drilling rig.
WO2010120701A3 (en) * 2009-04-14 2011-02-24 Shnell James H Ocean floor deep-sea submerged deck
CN102182402A (en) * 2011-04-27 2011-09-14 上海万协机电科技有限公司 Gas discharge drilling machine capable of positioning quickly
CN102322219A (en) * 2011-05-26 2012-01-18 上海交通大学 Seabed jet drill truck
GB2497325A (en) * 2011-12-07 2013-06-12 Peter Gerard Allan Disconnectable sea floor drilling rig base frame
US8490718B2 (en) 2009-07-29 2013-07-23 Seabed Rig As Portable pipe storage device
WO2013110917A3 (en) * 2012-01-24 2014-07-17 Fugro Seacore Limited Drilling system and method
CN104775755A (en) * 2015-04-29 2015-07-15 北京南车时代机车车辆机械有限公司 Truck-mounted drill machine and mast mechanism thereof
KR20160084609A (en) 2015-01-06 2016-07-14 대우조선해양 주식회사 Drilling system and method
GB2541005A (en) * 2015-08-05 2017-02-08 Aquaterra Energy Ltd Well abandonment frame, cartridge and method of carrying out abandonment operations
RU2624841C1 (en) * 2016-04-15 2017-07-07 Российская Федерация, от имени которой выступает ФОНД ПЕРСПЕКТИВНЫХ ИССЛЕДОВАНИЙ Underwater drilling module for drilling oil and gas wells
WO2018117861A1 (en) * 2016-12-23 2018-06-28 Statoil Petroleum As Subsea assembly modularisation
RU2669596C1 (en) * 2017-12-07 2018-10-12 Российская Федерация, от имени которой выступает ФОНД ПЕРСПЕКТИВНЫХ ИССЛЕДОВАНИЙ Underwater drilling module
GB2576837A (en) * 2015-08-05 2020-03-04 Aquaterra Energy Ltd Cartridge and method of carrying out abandonment operations
US10697245B2 (en) 2015-03-24 2020-06-30 Cameron International Corporation Seabed drilling system
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US11499379B2 (en) 2019-03-20 2022-11-15 Rigtec Wellservice As System and method for subsea well operation
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US7584796B2 (en) * 2002-04-30 2009-09-08 Coupler Developments Limited Drilling rig
NO323508B1 (en) * 2005-07-05 2007-05-29 Seabed Rig As Drilling rig located on the seabed and equipped for drilling of oil and gas wells
WO2007004887A1 (en) 2005-07-05 2007-01-11 Seabed Rig As Drilling rig placed on the sea bed and equipped for drilling of oil- and gas wells
US7600570B2 (en) 2005-07-05 2009-10-13 Seabed Rig As Drilling rig placed on the sea bed and equipped for drilling of oil and gas wells
NO329080B1 (en) * 2006-03-20 2010-08-16 Seabed Rig As Device for tool handling in a drilling rig located on the seabed
WO2007108696A1 (en) * 2006-03-20 2007-09-27 Seabed Rig As Drilling rig situated on the seabed, including a separation device
WO2007108698A1 (en) * 2006-03-20 2007-09-27 Seabed Rig As Tool handling device in a drilling rig situated on the seabed
WO2007108697A1 (en) * 2006-03-20 2007-09-27 Seabed Rig As Sealed pipe coupling unit for a drilling rig device situated on the seabed
US7644768B2 (en) 2006-03-20 2010-01-12 Seabed Rig As Separation device for material from a drilling rig situated on the seabed
NO330847B1 (en) * 2006-03-20 2011-07-25 Seabed Rig As Apparatus for separating material from a coupling unit in a drilling rig located on the seabed
EP1914379A1 (en) * 2006-10-19 2008-04-23 Adel Sheshtawy Underwater seafloor drilling rig
WO2008100149A1 (en) * 2007-02-14 2008-08-21 Seabed Rig As Method and device for erecting a drill rig on a sea bed
US7735561B2 (en) * 2007-03-01 2010-06-15 Chevron U.S.A. Inc. Subsea adapter for connecting a riser to a subsea tree
EP2147182A1 (en) * 2007-04-20 2010-01-27 Seabed Rig AS A method and a device for intervention in an underwater production well
EP2147182A4 (en) * 2007-04-20 2015-04-29 Robotic Drilling Systems As A method and a device for intervention in an underwater production well
WO2010120701A3 (en) * 2009-04-14 2011-02-24 Shnell James H Ocean floor deep-sea submerged deck
GB2470763A (en) * 2009-06-04 2010-12-08 Lance Stephen Davis Underwater drilling rig.
US8490718B2 (en) 2009-07-29 2013-07-23 Seabed Rig As Portable pipe storage device
CN102182402A (en) * 2011-04-27 2011-09-14 上海万协机电科技有限公司 Gas discharge drilling machine capable of positioning quickly
CN102322219A (en) * 2011-05-26 2012-01-18 上海交通大学 Seabed jet drill truck
GB2497325A (en) * 2011-12-07 2013-06-12 Peter Gerard Allan Disconnectable sea floor drilling rig base frame
WO2013110917A3 (en) * 2012-01-24 2014-07-17 Fugro Seacore Limited Drilling system and method
KR20160084609A (en) 2015-01-06 2016-07-14 대우조선해양 주식회사 Drilling system and method
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