US3782460A - Method of installing a combination pedestal conductor and conductor string at an offshore location - Google Patents

Method of installing a combination pedestal conductor and conductor string at an offshore location Download PDF

Info

Publication number
US3782460A
US3782460A US00277004A US3782460DA US3782460A US 3782460 A US3782460 A US 3782460A US 00277004 A US00277004 A US 00277004A US 3782460D A US3782460D A US 3782460DA US 3782460 A US3782460 A US 3782460A
Authority
US
United States
Prior art keywords
conductor
string
pedestal
drill string
drilling
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00277004A
Other languages
English (en)
Inventor
D Skinner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell USA Inc
Original Assignee
Shell Oil Co
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 Shell Oil Co filed Critical Shell Oil Co
Application granted granted Critical
Publication of US3782460A publication Critical patent/US3782460A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/12—Underwater drilling
    • E21B7/128—Underwater drilling from floating support with independent underwater anchored guide base

Definitions

  • ABSTRACT A pedestal conductor, buoyancy member, and con- 30 Foreign Application priority Data ductor string are installed at an offshore location by Aug. 24, 1971 Great Britain 39,636/71 Wi the cotlductor string into theporfahole during drilling, cementing the conductor string in the bore- [52] US CL 166/5 1.75/7 hole, and subsequently lowering the pedestal conduc- [51] Int.
  • wells are drilled below a body of water by special equipment using wellheads suitable for use on the bottom of the body of water.
  • the necessary operations to be carried out at the wellhead are performed by divers or by remotely controlled manipulators.
  • This technique is suitable for application in water which is either too deep for placement of permanent marine structures or where structures disposed above the body of water are not permitted for navigation or other reasons.
  • a major problem affecting the installation of a pedestal conductor in its operative position is the influence of the weather. Deterioration of weather conditions during lowering of a pedestal conductor from a vessel from which the operations take place will endanger the operation and therefore the lowering and coupling operation should take place in a time interval which is as short as possible.
  • Another object of the present invention is to provide a method of drilling a hole into the sea bottom for placing a conductor string therein followed by the installation of a pedestal conductor on the conductor string without requiring the use of any guide lines for guiding the drilling equipment, conductor string and pedestal conductor to the location where a well is to be drilled.
  • An even further object of the present invention is to provide a method of placing a pedestal conductor on a well to be drilled into the sea bottom, wherein all the equipment is suspended from a vessel before making any contact with the sea bottom thereby reducing the time interval in which deterioration of weather conditions could adversely influence the landing operations of the pedestal conductor on the conductor string.
  • FIG. 1-8 show schematically the various steps that are taken to install a pedestal conductor and a conductor string at a desired location on the sea bottom;
  • FIG. 9 shows a cross-section of the couplings taken along line 99 in FIG. 4;
  • FIG. 10 shows a cross-section of the lower end of the conductor string along line 10-10 of FIG. 2;
  • FIG. 11 is a cross-section taken along line l111 of FIG. 4 and shows the lower end of the conductor string when the drilling unit is mounted therein.
  • FIG. l-8 there is shown a floating vessel 1 having a passage 2 therethrough of sufficient width to house and allow passage of a buoyancy member 3.
  • the buoyancy member 3 is provided with connecting means 4 to facilitate connecting it to the floating vessel 1.
  • the buoyancy member 3 is partly supported by the body of water which extends between the sea bottom 5 and the water level 6.
  • Guide posts 7 are mounted on the buoyancy member 3 which can in a later stage of the operations, be used for guiding drilling and completion equipment to the well.
  • a central opening 8 is provided in the buoyancy member 3 to allow the conductor string 9 (FIG. 2) and the pedestal conductor 10 (FIG 2.) to pass therethrough.
  • Coupling means 11 is also provided for coupling the pedestal conductor 10 to the buoyancy member 3 (FIG. 3).
  • the conductor string 9 is coupled to the pedestal conductor 10 by a coupling 12 which can also be passed through the opening 8 of the buoyancy member 3 when being lowered with the conductor string 9 and the pedestal conductor 10.
  • the coupling 12 (FIG. 9) consists of a thickened portion of the lower end of the wall of the pedestal conductor 10 wherein an annular cylinder 43 housing an annular piston 44 is arranged.
  • Locking dogs 45 are provided for engaging an annular groove 46 in the outer wall of the conductor string 9. By upward displacing of the piston 44, the locking dogs 45 are pressed into the annular groove 47 in the inner wall of the piston 44. Displacement of the locking dogs 45 is accomplished by an axial displacement of the conductor string 9 with respect to the pedestal conductor 10. The slanted edges of the groove 46 in contact with the slanted edges of the locking dogs 45 will then displace the dogs radially outwards and partly into the groove 47 disengaging a coupling 16.
  • the coupling action of coupling 12 is accomplished by a downward movement of the piston 44.
  • the piston 44 is movable by pressure changes in the upper and lower parts of the cylinder 43. These pressure changes are created by variation of the pressure in the channels ofa hose 20 (FIG. 2).
  • the hose 20 and the communication between the channels thereof and the spaces of cylinder 43 are not shown in FIG. 9.
  • Sealing elements 48 and 49 are provided to prevent leakage of fluid through the coupling 12.
  • the coupling 12 When a sufficient length of conductor string has been lowered, the coupling 12 is assembled and the lower end of the pedestal conductor 10 connected thereto, and subsequently lowered through the opening 8 of the buoyancy member 3.
  • the hydraulic control conduit 20 is connected to the coupling 12 and lowered simultaneously therewith to hydraulically operate the coupling 12 as hereinbefore described.
  • the conductor 10 After the desired length of the pedestal conductor 10 has been lowered into the water, the conductor 10 is coupled to the buoyancy member 3 by means of a coupling 11 and suspended from the buoyancy member 3 (FIG. 3).
  • a hydraulic turbine 14 carrying a drill bit 23 is lowered through the pedestal conductor 10 and the conductor string 9.
  • the hydraulic turbine 14 is suspended from a drill string which is lowered in sections into the pedestal conductor 10 by the elevator 21 carried by the travelling block 19 of the derrick (not shown) mounted on the vessel 1. Lowering proceeds until the turbine 14 is in a position (FIG. 4) to mate with the cutting shoe 13.
  • the drill pipe 15 is coupled to the conductor string 9 by means of a coupling 16.
  • the coupling 16 consists of a thickened wall portion of the drill string 15, which carries a number of pins 40 to engage an equal number of .l-slots 41 arranged in the inner wall of the conductor string9.
  • a sealing number 42 is provided to prevent leakage of drilling liquid along the coupling parts.
  • the coupling 12 between the pedestal conductor 10 and the conductor string 9 is uncoupled and the conductor string 9 and the drill string 15 are lowered by adding sections of drill Dipe to the top of the drill string 15 until the drill bit 23 rests on the sea bottom 5 (FIG. 5).
  • Drilling operations are then started by introducing a liquid (such as sea water) to actuate the hydraulic turbine 14 through the drill string 15 via the swivel 22 carried by the travelling block 19.
  • the drilling bit 23, which is connected to the hydraulic turbine 14, and the cutting shoe 13 are in turn actuated by the hydraulic turbine 14 and a hole 24 (FIG. 6) is drilled and the conductor string 9 is lowered as the depth of the hole 24 increases.
  • coupling 16 is uncoupled and the drill string 15 is partially retracted from the conductor string 9 to a position (FIG. 6) where a packer 17 isstill within the conductor string 9.
  • the packer 17 is set.
  • the drill string 15 is made in two parts 15A and 15B, which are connected by a screw coupling 55 (FIG. 11), which on actuation in one direction moves the parts of the drill string to compress the packer element 17.
  • To this end part 158 is coupled to the inner wall of the conductor string 9 by the slips 56 which are pressed outwardly by a downward movement of the drill string 15.
  • cement is passed through the swivel 22, the drill string 15, the hydraulic turbine 14, the conductor string 9, and the cutting shoe 13 and into the space around the conductor string 9 where it hardens to a cement layer 25 (FIG. 7).
  • the cement is followed by a slug of cleaning liquid, such as water, to clean the I interior of the hydraulic turbine 14.
  • the pedestal conductor 10, together with the buoyancy member 3, is guided downwards along the drill string 15.
  • cables 26 (FIG. 7) are connected to the guide posts 7 of the buoyancy member 3 and the buoyancy member is disconnected from the vessel 1 (by uncoupling the elements 4).
  • the buoyancy of the member 3 is decreased by pumping water into this member, and the combination of the member 3 and the pedestal conductor 10 is suspended from the cables 26 which are paid out to lower the lower end of the pedestal conductor 10 gently onto the upper end of the conductor string 9.
  • the coupling 12 is again coupled by sending the required signals through the conduit 20.
  • the buoyancy of the member 3 is increased again, such as by displacing ballast water from the interior thereof, and the pedestal conductor 10 is put under tension.
  • the packer 17 is subsequently released and the drill string 15 together with coupling 16, packer 17, hydraulic turbine 14 and drill bit 23 are retracted from the pedestal conductor 10 and stored aboard the vessel 1.
  • a blow-out preventer stack 27 (FIG. 8) is lowered onto the top of the pedestal conductor 10 by means of a string 28 suspended from the travelling block 19 by elevator 30.
  • the stack 27 is guided to the top of the pedestal conductor 10 by means of the cables 26 which act as guide cables for the arms 31 connected to the stack 27.
  • all drilling operations for deepening the well take place in a manner known per se, using the guide cables 26 for guiding the required drilling and completion equipment into and onto the entrance of the pedestal conductor 10.
  • the lower end of the conductor string 9 carries a rotat-able cutting shoe 13, and is shown in detail in FIG. 10.
  • the shoe 13 is rotatably connected to the lower end of string 9 by locking means 50 preventing axial displacement between the shoe 13 and the string 9.
  • the shoe 13 is further provided with a splined section 51 which mates with a splined section of the turbine 14.
  • the lower end of the cutting shoe 13 also carries an annular row of cutting elements such as teeth 52.
  • the central opening of the cutting shoe 13 is surrounded by cutting elements 52 and houses a drill bit 23 which is connected via a splined section 53 to the output shaft 54 of the hydraulic turbine 14.
  • Splined section 53 co-operates with the splined section 51 of the rotatable cutting shoe 13 such that on actuation of the hydraulic turbine the drill bit 23 and the cutting elements 52 of the cutting shoe 13 are rotated in unison thereby drilling a hole into the floor 5 of the body of water, lowering the conductor string 9 as the drilling proceeds.
  • the conductor string 9 is cemented in the hole 24 before the pedestal conductor 10 is lowered thereon.
  • the pedestal conductor 10 may be lowered onto the conductor string 9 and coupled thereto before the conductor string 9 is cemented in the hole 24.
  • the drill string preferably remains in the position in which it is coupled to the conductor string 9 by coupling 16. Subsequently, coupling 12 is made, and drill string 15 is uncoupled from the conductor string 9 and retracted, together with packer 17, hydraulic turbine 14 and drill bit 23 to the position as shown in FIG.
  • the pedestal conductor 10 is not suspended from the cables 26 as described with reference to FIG. 7 of the drawing, but is coupled by a coupling (not shown) to the drill string 15 and suspended from this drill string in a position in which the drill string is for the greater part retracted from the conductor string. Subsequently, the drill string is lowered until the coupling between the lower end of the pedestal conductor and the upper end of the conductor string can be made. This operation may take place either before or after cementing of the conductor string in the hole drilled into the sea bottom.
  • the method of placing a pedestal conductor and conductor string as described above is a safe way of handling an extremely long pipe strings from a vessel. Since the pedestal conductor is suspended from the vessel while the drilling operation is carried out to lower the conductor string into the sea bottom, the pedestal conductor cannot be lost if drilling operations have to be terminated, even if this were to entail abandoning of the conductor string. Moreover, lowering of the pedestal conductor onto the conductor string once it is positioned in the hole drilled in the sea bottom can take place in a very short time interval as the pedestal conductor is already suspended from the vessel and ready for use.
  • the diameter of the latter may be equal to or only slightly greater than the diameter of the conductor string allowing a more economical pedestal conductor than in prior art operations which require that the conductor string be guided through the pedestal conductor.
  • the lighter construction of the pedestal conductor allows the use of a smaller buoyancy member.
  • the drill string is introduced into the pedestal conductor-conductor string combination in two parts instead of one.
  • the first part of the drill string (carrying a coupling, a packer, a turbine and a drill bit) is introduced into the conductor string and suspended therein by the coupling, just after the conductor string has been made up to its full length.
  • the second part of the drill string is introduced and coupled to the first part thereof, just after the pedestal conductor has been made up to its full length and connected to the buoyancy member by a coupling suitable for the purpose. Subsequently, the coupling between the pedestal conductor and the conductor string is released and the operation proceeds as described already hereinabove with reference to FIGS. 58.
  • a method of installing a conductor string and a pedestal conductor at an offshore location from a floating structure comprising the steps of:
  • cementing the conductor string in the hole by injecting cement through the drill string and the conductor string followed by a slug of cleaning fluid;
  • cementing the conductor string in the hole by injecting cement through the drill string and the conductor string followed by a slug of cleaning fluid;
  • steps being carried out between the step of coupling said first coupling means and prior to the step of retracting said drill string.
  • Apparatus for installing a pedestal conductor and conductor string at an offshore location wherein the conductor string is lowered into a hole in the sea bottom during the drilling operation comprising:
  • a conductor string adapted to be cemented over substantially the entire length thereof in a hole drilled in the sea bottom;
  • buoyancy member having a central passage therethrough
  • a pedestal conductor adapted to extend between the upper end of said conductor string and said buoyancy member
  • first coupling means adapted to couple said pedestal conductor to said conductor string
  • second coupling means adapted to couple said drill string to the inner wall of said conductor string
  • third coupling means adapted to couple said pedestal conductor to said buoyancy member
  • a drilling unit having a drilling bit, said unit being carried by the lower end of said drill string;
  • a rotatable cutting shoe carried by the lower end of said conductor string and adapted to be driven by said drilling unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
US00277004A 1971-08-24 1972-08-01 Method of installing a combination pedestal conductor and conductor string at an offshore location Expired - Lifetime US3782460A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3963671A GB1361296A (en) 1971-08-24 1971-08-24 Method of placing a pedestal conductor and a conductor string used in drilling an offshore well

Publications (1)

Publication Number Publication Date
US3782460A true US3782460A (en) 1974-01-01

Family

ID=10410639

Family Applications (1)

Application Number Title Priority Date Filing Date
US00277004A Expired - Lifetime US3782460A (en) 1971-08-24 1972-08-01 Method of installing a combination pedestal conductor and conductor string at an offshore location

Country Status (8)

Country Link
US (1) US3782460A (it)
JP (1) JPS557516B2 (it)
AU (1) AU467000B2 (it)
CA (1) CA967143A (it)
FR (1) FR2150425B1 (it)
GB (1) GB1361296A (it)
IT (1) IT964976B (it)
OA (1) OA04157A (it)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991824A (en) * 1975-11-20 1976-11-16 Atlantic Richfield Company Offshore well drilling, completion and production
US3999617A (en) * 1975-09-29 1976-12-28 Exxon Production Research Company Self-supported drilling riser
FR2444787A1 (fr) * 1978-12-22 1980-07-18 Inst Francais Du Petrole Dispositif a conduite flexible permettant d'effectuer des operations de forage, de carottage et des mesures in situ dans les fonds sous-marins
WO1981003157A1 (en) * 1980-05-02 1981-11-12 Global Marine Inc Submerged buoyant offshore drilling and production tower
US4510985A (en) * 1983-09-20 1985-04-16 Phillips Petroleum Company Stacked open bottom temporary guide base for offshore drilling
US4511287A (en) * 1980-05-02 1985-04-16 Global Marine, Inc. Submerged buoyant offshore drilling and production tower
FR2584448A1 (fr) * 1985-07-04 1987-01-09 Commissariat Energie Atomique Procede et installation de forage et de tubage dans un sol
US4759413A (en) * 1987-04-13 1988-07-26 Drilex Systems, Inc. Method and apparatus for setting an underwater drilling system
US5060731A (en) * 1991-02-22 1991-10-29 Mcdermott International, Inc. Method of installing well conductors
US5146990A (en) * 1991-04-30 1992-09-15 Shell Offshore Inc. Anchoring structure for marine riser assembly
US6484820B1 (en) * 1997-01-28 2002-11-26 Wirth Maschinen-Und Bohrgeraete Fabrik Gmbh Method and device for driving bore-holes, especially in the sea bed, using a guide tip
WO2003074836A1 (en) * 2002-03-01 2003-09-12 Head Philip Conductor system
US6626248B1 (en) * 1999-05-05 2003-09-30 Smith International, Inc. Assembly and method for jarring a drilling drive pipe into undersea formation
US20050006105A1 (en) * 2002-12-02 2005-01-13 Bell Douglas B Method and apparatus for through rotary sub-sea pile-driving
US20060169491A1 (en) * 2003-03-13 2006-08-03 Ocean Riser Systems As Method and arrangement for performing drilling operations
US20090200037A1 (en) * 2003-03-13 2009-08-13 Ocean Riser Systems As Method and arrangement for removing soils, particles or fluids from the seabed or from great sea depths
US20130256030A1 (en) * 2010-11-09 2013-10-03 Agr Subsea As Method and device for establishing a borehole in the seabed
US8708038B2 (en) 2011-06-30 2014-04-29 Donnie C. Tucker Pipe grapple
WO2016144177A1 (en) * 2015-03-11 2016-09-15 Van Oord Dredging And Marine Contractors B.V. Subsea grab system and marine vessel having such subsea grab system
US20180030791A1 (en) * 2016-07-28 2018-02-01 Cameron International Corporation Lifting Apparatus for Subsea Equipment

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2316522A1 (fr) * 1975-06-30 1977-01-28 Erap Dispositif de connexion pour portions successives de conduits, notamment pour conduits petroliers immerges
US4478287A (en) * 1983-01-27 1984-10-23 Hydril Company Well control method and apparatus
NO347971B1 (en) * 2022-09-13 2024-06-03 Fmc Kongsberg Subsea As Method for providing a subsea template system with a tail pipe and a subsea template system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196958A (en) * 1960-04-04 1965-07-27 Richfield Oil Corp Offshore drilling method and apparatus
US3682243A (en) * 1968-10-07 1972-08-08 Shell Oil Co Under water wells
US3732143A (en) * 1970-06-17 1973-05-08 Shell Oil Co Method and apparatus for drilling offshore wells

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196958A (en) * 1960-04-04 1965-07-27 Richfield Oil Corp Offshore drilling method and apparatus
US3682243A (en) * 1968-10-07 1972-08-08 Shell Oil Co Under water wells
US3732143A (en) * 1970-06-17 1973-05-08 Shell Oil Co Method and apparatus for drilling offshore wells

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999617A (en) * 1975-09-29 1976-12-28 Exxon Production Research Company Self-supported drilling riser
US3991824A (en) * 1975-11-20 1976-11-16 Atlantic Richfield Company Offshore well drilling, completion and production
FR2444787A1 (fr) * 1978-12-22 1980-07-18 Inst Francais Du Petrole Dispositif a conduite flexible permettant d'effectuer des operations de forage, de carottage et des mesures in situ dans les fonds sous-marins
WO1981003157A1 (en) * 1980-05-02 1981-11-12 Global Marine Inc Submerged buoyant offshore drilling and production tower
US4511287A (en) * 1980-05-02 1985-04-16 Global Marine, Inc. Submerged buoyant offshore drilling and production tower
US4510985A (en) * 1983-09-20 1985-04-16 Phillips Petroleum Company Stacked open bottom temporary guide base for offshore drilling
FR2584448A1 (fr) * 1985-07-04 1987-01-09 Commissariat Energie Atomique Procede et installation de forage et de tubage dans un sol
US4759413A (en) * 1987-04-13 1988-07-26 Drilex Systems, Inc. Method and apparatus for setting an underwater drilling system
FR2613763A1 (fr) * 1987-04-13 1988-10-14 Drilex Syst Inc Procede et appareil pour poser un tube-guide de forage sous l'eau
US5060731A (en) * 1991-02-22 1991-10-29 Mcdermott International, Inc. Method of installing well conductors
US5146990A (en) * 1991-04-30 1992-09-15 Shell Offshore Inc. Anchoring structure for marine riser assembly
US6484820B1 (en) * 1997-01-28 2002-11-26 Wirth Maschinen-Und Bohrgeraete Fabrik Gmbh Method and device for driving bore-holes, especially in the sea bed, using a guide tip
US6626248B1 (en) * 1999-05-05 2003-09-30 Smith International, Inc. Assembly and method for jarring a drilling drive pipe into undersea formation
WO2003074836A1 (en) * 2002-03-01 2003-09-12 Head Philip Conductor system
US20050006105A1 (en) * 2002-12-02 2005-01-13 Bell Douglas B Method and apparatus for through rotary sub-sea pile-driving
US20060169491A1 (en) * 2003-03-13 2006-08-03 Ocean Riser Systems As Method and arrangement for performing drilling operations
US7513310B2 (en) * 2003-03-13 2009-04-07 Ocean Riser Systems As Method and arrangement for performing drilling operations
US20090200037A1 (en) * 2003-03-13 2009-08-13 Ocean Riser Systems As Method and arrangement for removing soils, particles or fluids from the seabed or from great sea depths
US7950463B2 (en) 2003-03-13 2011-05-31 Ocean Riser Systems As Method and arrangement for removing soils, particles or fluids from the seabed or from great sea depths
US20130256030A1 (en) * 2010-11-09 2013-10-03 Agr Subsea As Method and device for establishing a borehole in the seabed
US8967292B2 (en) * 2010-11-09 2015-03-03 Agr Subsea As Method and device for establishing a borehole in the seabed
US8708038B2 (en) 2011-06-30 2014-04-29 Donnie C. Tucker Pipe grapple
WO2016144177A1 (en) * 2015-03-11 2016-09-15 Van Oord Dredging And Marine Contractors B.V. Subsea grab system and marine vessel having such subsea grab system
US20180030791A1 (en) * 2016-07-28 2018-02-01 Cameron International Corporation Lifting Apparatus for Subsea Equipment

Also Published As

Publication number Publication date
AU4584772A (en) 1974-02-28
FR2150425B1 (it) 1976-10-29
CA967143A (en) 1975-05-06
JPS4830602A (it) 1973-04-23
AU467000B2 (en) 1975-11-13
FR2150425A1 (it) 1973-04-06
IT964976B (it) 1974-01-31
GB1361296A (en) 1974-07-24
JPS557516B2 (it) 1980-02-26
OA04157A (fr) 1979-12-15

Similar Documents

Publication Publication Date Title
US3782460A (en) Method of installing a combination pedestal conductor and conductor string at an offshore location
US3032125A (en) Offshore apparatus
US5533574A (en) Dual concentric string high pressure riser
US3209829A (en) Wellhead assembly for under-water wells
US4630680A (en) Well control method and apparatus
US4478287A (en) Well control method and apparatus
US3259198A (en) Method and apparatus for drilling underwater wells
US4993492A (en) Method of inserting wireline equipment into a subsea well
US3145775A (en) Method and apparatus for conducting offshore drilling operations
US3256937A (en) Underwater well completion method
WO2000034619A1 (en) Deep ocean drilling method
US3672447A (en) Marine well drilling method and apparatus
US3602303A (en) Subsea wellhead completion systems
US3324943A (en) Off-shore drilling
US3721294A (en) Underwater pipe connection apparatus
US6367554B1 (en) Riser method and apparatus
US3256936A (en) Drilling underwater wells
NO20191012A1 (en) An apparatus for forming at least a part of a production system for a wellbore, and a line for and a method of performing an operation to set a cement plug in a wellbore
US4086971A (en) Riser pipe inserts
US3252528A (en) Method of drilling from a fully floating platform
US12305513B2 (en) Rigless drilling and wellhead installation
US3391735A (en) Means for drilling, completing, producing and treating submarine wells
US3754607A (en) Equipment for use in offshore wells
US3554277A (en) Underwater wells
US3486555A (en) Small diameter riser pipe system