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US3621912A - Remotely operated rotating wellhead - Google Patents

Remotely operated rotating wellhead Download PDF

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Publication number
US3621912A
US3621912A US3621912DA US3621912A US 3621912 A US3621912 A US 3621912A US 3621912D A US3621912D A US 3621912DA US 3621912 A US3621912 A US 3621912A
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Grant
Patent type
Prior art keywords
element
bearing
housing
sealing
rotating
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
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Inventor
Lemuel D Wooddy Jr
Hubert P Bezner
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.)
ExxonMobil Upstream Research Co
Esso Products Research Co
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ExxonMobil Upstream Research Co
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/02Surface sealing or packing
    • E21B33/08Wipers; Oil savers
    • E21B33/085Rotatable packing means, e.g. rotating blow-out preventers

Abstract

A remotely operated rotating wellhead having a sealing element made of resilient material and a bearing element. The sealing element which is energized by pressure fits inside of and rotates with the bearing element. A retaining cap is provided with retractable, remotely operated latches to permit replacing the sealing element remotely. The lower end of the rotating wellhead is attached to the upper end of a blowout preventer (BOP) stack through suitable subsea connectors.

Description

United States Patent [72] inventors Lemuel D. Wooddy, Jr. 2,192,805 3/1940 Seamark 277/31 Houston, Tex.; 2,909,359 10/1959 Bauer et al.. 175/7 Hubert P. Bezner, Chatsworth, Calif. 3,023,012 2/ 1 962 Wilde 277/31 [21] App]. No. 883,726 3,387,851 6/1968 Cugini 277/31 X [22] Filed Dec. 10,1969 3,492,007 1/1970 Jones 277/31 x2512: Research Com an Primary Examiner-Marvin A. Champion g p y Assistant Examiner- Richard E. Favreau Attorneys-Timothy L. Burgess, Thomas B. McCullouch, [54 REMOTELY OPERATED WELLHEAD Melvin F. Fincke, John S. Schneider, Sylvester W. Bl'OCk,

4 Claims, 2 Drawing Figs. and Kurt Myers [52] US. Cl 166/.5,

277/31 ABSTRACT: A remotely operated rotating wellhead having a {51 Int. Cl E2lb 33/035 sealing element made of resilient material and a bearing ele- [50] Field of Search 175/7; The sealing eIemem which is energized y Pl"?Ssure m5 277/31; 166/5 inside of and rotates with the bearing element. A retaining cap is provided with retractable, remotely operated latches to per- References Cited mit re lacin the sealin element remotel The lower end of P g g Y UNITED STATES PATENTS the rotating wellhead is attached to the upper end of a blowout 1,942,366 1/1934 Seamark 277 31 (BOP) sack hmugh Suimble Subs DRILL PIPE IO '2 RETAINER L 1' PL ATE 27 33 ASiESMBI-Y 46 47 33 27 LUBE LINE SEALING ELEMENT 34 I 40 30 y l J] 4| HY DRAULIC LINE 2 MUD RETURN PATENTEnuuv 23 l97| sum 1 [1F 2 DRILLING BARGE DRILL PIPE- GUIDE LINES:

ROTATING HEAD GUIDE SLEEVE B.O.P. STAG K WELL-HEAD MUD RETURN LINE FIG. I.

' l as ,-FLEXIBLE JOINT \CONNECTOR couulgc'ron INVEN'IOR. LEMUEL D. WOODDY, JR.,

HUBERT P. BEZNER,

WWI M AT TORNEY.

I BY

PATENIEnudv 23 new: 3, 5 21 ,9 1 2 SHEET 2 0F 2 DRILL PIPE l0 Lg RETAINER PLATE LATCH M$SEMBLY 27 46 47 33 33 45 l I I KW VV" c M i was um:

I V smumcgbuzmm g 4' HYDRAULIC.

mun RETURN INVliN'IUR. LEMUEL D-WOODDY,JR., HUBERT P. BEZNER,

ATTORNEY.

BACKGROUND OF THE INVENTION When drilling oil and/or gas wells from a floating vessel, it has been the practice to install a marine riser (steel pipe) to provide a return path for drilling fluids and formation cuttings and as means for guiding the drill bit into the well bore through the subsea blowout preventer. Normally, a slip joint" is included at the top of the marine riser to accommodate vessel motion. In relatively shallow water, the marine riser is sufficiently stiff to stand alone without the need for external tension. In deeper water, however, the longer marine riser becomes very limber and it has a tendency to buckle due to the various forces acting on it. In order to counteract these forces and thereby reduce the resulting stresses in the pipe, an axial load is applied at the top of the marine riser to maintain a predetermined level of tension. Current methods for applying this constant tension utilize either dead weight, counterweights or pneumatic cylinders. As the water depth increases, the amount of tension required for a given diameter marine riser also increases, which in turn requires larger tensioning systems. Limited deck space, handling difficulties, and high costs make a method for either eliminating or at least minimizing such high tension requirements highly desirable. One solution provided by the present invention involves eliminating the marine riser. If the marine riser is not required to permit the passage of drill strings, casing strings and ocean floor casing hangers internally, a simple mud return line having a considerably reduced diameter may be used. In this manner tension requirements are reduced and possibly even eliminated through the use of a neutrally buoyant flexible return line.

Drilling fluids or muds" normally used have a higher specific gravity than does sea water. If a mud return line is used through which the drill string is not run, a pressure differential is created at the point at which the drill string enters the subsea well-head (or subsea blowout preventer). This pressure differential is equal to the difference between the hydrostatic heads of mud column and sea water column. Equipment required for an arrangement of this type must:

I. Withstand the pressure differentials regardless of whether the drill string, casing string, etc. is in or out of the hole.

2. Permit the entry of various diameters of drilling equipment such as bits, stabilizers, drill collars, tool joints, etc., and simultaneously maintain a pressuretight seal.

3. Maintain a pressuretight seal while the drill string is rotating and/or reciprocating vertically.

4. Permit changing the packing element easily.

5. Be operated remotely from the drilling vessel.

SUMMARY OF THE INVENTION A remotely operated rotating wellhead for use in drilling subsea wells which includes a housing for connection to subsea equipment; a rotatable bearing element arranged in the housing; a sealing element attached to the bearing element and expandable by pressure to engage drill pipe or other tool against whichthe sealing element is to seal; bearings arranged between said bearing element and said housing; seal means arranged between said bearing element and said housing; a retainer plate for retaining said bearing element and sealing element within said housing. Hydraulic lines extending from the water surface may be connected to conduits within the housing and bearing element to supply fluid pressure within the sealing element to expand the element into sealing position or a passageway may be formed in the bearing element in communication with the well bore to permit well fluids to supply the pressure for inflating the sealing element. Lubrication lines are provided from the surface of the water to supply lubrication to the bearing surfaces between the bearing element and the housing. In addition, the retainer plate may be provided with a hydraulically operated latch mechanism. The hydraulic fluid for the latch mechanism is supplied from the surface of the water. Suitable guide means are provided to facilitate proper subsea positioning of the housing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the remotely operated rotating wellhead connected into an operable drilling system; and FIG. 2 is a partly sectional view showing the remotely operated rotating wellhead in greater detail.

DESCRIPTION OF THE PREFERRED EMBODIMENTS There is shown in FIG. 1 an arrangement of equipment for offshore drilling operations which includes a drill pipe 10 suspended from a floating drilling barge ll. Drill pipe 10 extends through subsea well apparatus which includes a rotating head 12, a flexible joint 13, a subsea connection 14, a BOP stack 15, a subsea connector 16 and a wellhead 17. The subsea well apparatus is lowered into position on guidelines 20 (other guide means could be used instead) which connect wellhead 17 to drilling barge 1 l. The subsea apparatus is provided with guide arms 21, connected to guide sleeves 22 through which the guidelines extend. A flexible mud return line 25 connects into the subsea apparatus below rotating head 12 and above flexible joint 13 and extends to the drilling barge l1. Rotating head 12 is provided with hydraulic lines 26 and 27 and a lubrication line 28, all of which extend to the drilling barge 11. Additional control lines, not shown, will be provided to control operation of the blowout preventers in the BOP stack 15 and in the subsea connectors 14 and 16.

For a more detailed description of rotating head 12, reference is made to FIG. 2. As shown in that figure, a sealing element 30, formed of resilient material similar to that used in bag-type blowout preventers fits inside of and is retained in and rotates with a bearing element 31 to which it is attached. Bearing element 31 is contained within a housing 32 and is covered by an upper retainer plate 33. A number of roller (and/or thrust) bearings 34 are arranged between the interior walls of housing 32 and bearing element 30 and retainer plate 33 is in contact with bearing element 31 by way of roller bearing 33a. A number of seals 35 are also arranged between the inner walls of housing 32 and retainer plate 33 and the outer walls of bearing element 31. A conduit 40 formed in bearing element 31 fluidly communicates the interior of sealing element 30 and a passageway 41 formed in the wall of housing 32 which in turn connects to hydraulic line 26. Another conduit or passageway 42 is formed in bearing element 31 and fluidly communicates the lower end of bearing element 31 exposed to well pressures and the interior of sealing element 30. Another passageway 43 formed in the wall of housing 32 connects to lubrication line 28 at one end and the space between the inner wall of housing 32 and the outer wall of bearing element 31. A hydraulically operated latch member 45 includes a hydraulically driven lug member 46 which is movable into and out of a recess 47 formed in retainer plate 33 and is supplied with hydraulic fluid through hydraulic line 27. A flange (or hub or other type connection) 50 formed in the lower end of housing 32 connects to mud return line 25.

In operation, wellhead 17 is lowered through the water from drilling barge I1 and secured to the land underlying the water, in accordance with conventional practice. Then, BOP stack 15, together with the subsea connector 16, subsea connector 14, flexible joint 13 and rotating head 12, including housing 32 and sealing element 30, bearing element 31 and retainer plate 33 are lowered on drill pipe 10 and guidelines 20 with the mud return line 25 connected to the subsea apparatus. Sealing of sealing element 30 against drill pipe 10 or other tool is achieved by exerting fluid pressure through hydraulic line 26 and passageways 41 and 40 or alternatively pressure from the well bore acting on sealing element 30 through passageway 42 may be used instead. Rotation of drill pipe 10, against which the sealing element 30 is sealed, rotates sealing element 30 and bearing element 31. Bearing surfaces between bearing element 31 and housing 32 are lubricated by a liquid similar to water soluble oil which'is supplied from drilling barge 11 through lubricating line 28 and passageway 43. The retaining gap 33 may be released by withdrawing lug 46 from recess 47 by hydraulic operation of the latch 45 through hydraulic lines 27 to permit replacing sealing element 30. Sealing element 30, bearing element 31 and retainer plate 33 are run and retrieved on drill pipe 10. When in subsea position, sealing element 30 permits passage of tool joints. Drill collars on drill pipe raise sealing element 30 and bearing element 31 out of housing 32 when coming out of the hold with drill pipe 10.

The rotating element may have grooves which spiral along its outer surface to carry away solids or other foreign material.

Having fully described the apparatus, operation, objects and advantages of our invention, we claim:

1. A remotely operated rotating wellhead comprising:

a housing connected to subsea equipment;

a rotatable bearing element arranged in said housing;

a fluid pressure expandable sealing element retained within and attached to said bearing element;

a releasable retainer plate arranged on top of said housing and said bearing element for retaining said bearing element within said housing;

remotely operated hydraulic means for releasing said retainer plate;

seal means arranged between the interior walls of said housing and said retainer plate and the exterior walls of said bearing element to close off the space therebetween;

bearing members permitting rotation of said bearing element and sealing element within said housing; and

means for supplying hydraulic fluid to the interior of said sealing element including a passageway fluidly communicating directly with well pressure and a passageway fluidly communicating with a source of fluid pressure exterior to said housing.

2. A rotating wellhead as recited in claim 1 in which said sealing element, bearing element and retainer plate are run and retrieved on drill pipe.

3. A rotating wellhead as recited in claim 1 in which said means permitting rotation of said sealing element and said bearing element within said housing includes roller bearings.

4. A rotating wellhead as recited in claim 3 including means arranged on said housing for cooperating with guide means extending from a floating vessel for guiding said housing into proper position on a subsea BOP stack.

Claims (4)

1. A remotely operated rotating wellhead comprising: a housing connected to subsea equipment; a rotatable bearing element arranged in said housing; a fluid pressure expandable sealing element retained within and attached to said bearing element; a releasable retainer plate arranged on top of said housing and said bearing element for retaining said bearing element within said housing; remotely operated hydraulic means for releasing said retainer plate; seal means arranged between the interior walls of said housing and said retainer plate and the exterior walls of said bearing element to close off the space therebetween; bearing members permitting rotation of said bearing element and sealing element within said housing; and means for supplying hydraulic fluid to the interior of said sealing element including a passageway fluidly communicating directly with well pressure and a passageway fluidly communicating with a source of fluid pressure exterior to said housing.
2. A rotating wellhead as recited in claim 1 in which said sealing element, bearing element and retainer plate are run and retrieved on drill pipe.
3. A rotating wellhead as recited in claim 1 in which said means permitting rotation of said sealing element and said bearing element within said housing includes roller bearings.
4. A rotating wellhead as recited in claim 3 including means arranged on said housing for cooperating with guide means extending from a floating vessel for guiding said housing into proper position on a subsea BOP stack.
US3621912A 1969-12-10 1969-12-10 Remotely operated rotating wellhead Expired - Lifetime US3621912A (en)

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Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804175A (en) * 1972-07-12 1974-04-16 D Miller System of firefighting and blow-out protection for a drilling operation
US4143881A (en) * 1978-03-23 1979-03-13 Dresser Industries, Inc. Lubricant cooled rotary drill head seal
DE2841819A1 (en) * 1978-09-22 1980-04-03 Mannesmann Ag Offshore telescopic joint seal for riser - with inflatable bladder acting on split ring between bearing bushes
US4673041A (en) * 1984-10-22 1987-06-16 Otis Engineering Corporation Connector for well servicing system
US5647444A (en) * 1992-09-18 1997-07-15 Williams; John R. Rotating blowout preventor
US5662181A (en) * 1992-09-30 1997-09-02 Williams; John R. Rotating blowout preventer
WO1998027313A1 (en) * 1996-12-19 1998-06-25 Hydril Company Apparatus for and method of assembling a rotary blowout preventer
US6138774A (en) * 1998-03-02 2000-10-31 Weatherford Holding U.S., Inc. Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment
US6216799B1 (en) * 1997-09-25 2001-04-17 Shell Offshore Inc. Subsea pumping system and method for deepwater drilling
US6244359B1 (en) * 1998-04-06 2001-06-12 Abb Vetco Gray, Inc. Subsea diverter and rotating drilling head
US6263982B1 (en) 1998-03-02 2001-07-24 Weatherford Holding U.S., Inc. Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
US6321846B1 (en) * 2000-02-24 2001-11-27 Schlumberger Technology Corp. Sealing device for use in subsea wells
US6470975B1 (en) 1999-03-02 2002-10-29 Weatherford/Lamb, Inc. Internal riser rotating control head
US20030102136A1 (en) * 2001-12-04 2003-06-05 Nelson John E. Rotating drilling head gripper
US20050061499A1 (en) * 2003-09-24 2005-03-24 Cooper Cameron Corporation Removable seal
EP1856371A1 (en) * 2005-02-21 2007-11-21 AGR Subsea AS Centralization and running tool and method
US20090139724A1 (en) * 2004-11-23 2009-06-04 Weatherford/Lamb, Inc. Latch position indicator system and method
US7559359B2 (en) 2007-08-27 2009-07-14 Williams John R Spring preloaded bearing assembly and well drilling equipment comprising same
US20090302243A1 (en) * 2008-06-09 2009-12-10 Scott Delbridge Wiper seal assembly
US7635034B2 (en) 2007-08-27 2009-12-22 Theresa J. Williams, legal representative Spring load seal assembly and well drilling equipment comprising same
US20100163243A1 (en) * 2007-04-05 2010-07-01 Andrea Sbordone Intervention system dynamic seal and compliant guide
US20100175882A1 (en) * 2009-01-15 2010-07-15 Weatherford/Lamb, Inc. Subsea Internal Riser Rotating Control Device System and Method
US7766100B2 (en) 2007-08-27 2010-08-03 Theresa J. Williams, legal representative Tapered surface bearing assembly and well drilling equiment comprising same
US7789172B2 (en) 2007-08-27 2010-09-07 Williams John R Tapered bearing assembly cover plate and well drilling equipment comprising same
US7836946B2 (en) 2002-10-31 2010-11-23 Weatherford/Lamb, Inc. Rotating control head radial seal protection and leak detection systems
US7926593B2 (en) 2004-11-23 2011-04-19 Weatherford/Lamb, Inc. Rotating control device docking station
US7997345B2 (en) 2007-10-19 2011-08-16 Weatherford/Lamb, Inc. Universal marine diverter converter
US20110203802A1 (en) * 2010-02-25 2011-08-25 Halliburton Energy Services, Inc. Pressure control device with remote orientation relative to a rig
US8286734B2 (en) 2007-10-23 2012-10-16 Weatherford/Lamb, Inc. Low profile rotating control device
US8347983B2 (en) 2009-07-31 2013-01-08 Weatherford/Lamb, Inc. Drilling with a high pressure rotating control device
US8347982B2 (en) 2010-04-16 2013-01-08 Weatherford/Lamb, Inc. System and method for managing heave pressure from a floating rig
US20130175043A1 (en) * 2004-11-30 2013-07-11 Mako Rentals, Inc. Downhole swivel apparatus and method
WO2014006149A2 (en) * 2012-07-06 2014-01-09 Statoil Petroleum As Dynamic annular sealing apparatus
US8739863B2 (en) 2010-11-20 2014-06-03 Halliburton Energy Services, Inc. Remote operation of a rotating control device bearing clamp
US8746344B2 (en) * 2010-11-15 2014-06-10 Baker Hughes Incorporated System and method for containing borehole fluid
WO2014105043A1 (en) * 2012-12-28 2014-07-03 Halliburton Energy Services, Inc. System and method for managing pressure when drilling
US8844652B2 (en) 2007-10-23 2014-09-30 Weatherford/Lamb, Inc. Interlocking low profile rotating control device
US9163473B2 (en) 2010-11-20 2015-10-20 Halliburton Energy Services, Inc. Remote operation of a rotating control device bearing clamp and safety latch
US9175542B2 (en) 2010-06-28 2015-11-03 Weatherford/Lamb, Inc. Lubricating seal for use with a tubular
US9260934B2 (en) 2010-11-20 2016-02-16 Halliburton Energy Services, Inc. Remote operation of a rotating control device bearing clamp
US9359853B2 (en) 2009-01-15 2016-06-07 Weatherford Technology Holdings, Llc Acoustically controlled subsea latching and sealing system and method for an oilfield device

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US2192805A (en) * 1936-03-18 1940-03-05 Seamark Lewis Mervyn Cecil Casing head equipment for bore holes or wells
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Cited By (75)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804175A (en) * 1972-07-12 1974-04-16 D Miller System of firefighting and blow-out protection for a drilling operation
US4143881A (en) * 1978-03-23 1979-03-13 Dresser Industries, Inc. Lubricant cooled rotary drill head seal
DE2841819A1 (en) * 1978-09-22 1980-04-03 Mannesmann Ag Offshore telescopic joint seal for riser - with inflatable bladder acting on split ring between bearing bushes
US4673041A (en) * 1984-10-22 1987-06-16 Otis Engineering Corporation Connector for well servicing system
US5647444A (en) * 1992-09-18 1997-07-15 Williams; John R. Rotating blowout preventor
US5662181A (en) * 1992-09-30 1997-09-02 Williams; John R. Rotating blowout preventer
WO1998027313A1 (en) * 1996-12-19 1998-06-25 Hydril Company Apparatus for and method of assembling a rotary blowout preventer
US5848643A (en) * 1996-12-19 1998-12-15 Hydril Company Rotating blowout preventer
US6216799B1 (en) * 1997-09-25 2001-04-17 Shell Offshore Inc. Subsea pumping system and method for deepwater drilling
US6263982B1 (en) 1998-03-02 2001-07-24 Weatherford Holding U.S., Inc. Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
US6138774A (en) * 1998-03-02 2000-10-31 Weatherford Holding U.S., Inc. Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment
US6244359B1 (en) * 1998-04-06 2001-06-12 Abb Vetco Gray, Inc. Subsea diverter and rotating drilling head
US6470975B1 (en) 1999-03-02 2002-10-29 Weatherford/Lamb, Inc. Internal riser rotating control head
US6321846B1 (en) * 2000-02-24 2001-11-27 Schlumberger Technology Corp. Sealing device for use in subsea wells
US20030102136A1 (en) * 2001-12-04 2003-06-05 Nelson John E. Rotating drilling head gripper
US6896076B2 (en) * 2001-12-04 2005-05-24 Abb Vetco Gray Inc. Rotating drilling head gripper
US8714240B2 (en) 2002-10-31 2014-05-06 Weatherford/Lamb, Inc. Method for cooling a rotating control device
US8113291B2 (en) 2002-10-31 2012-02-14 Weatherford/Lamb, Inc. Leak detection method for a rotating control head bearing assembly and its latch assembly using a comparator
US7836946B2 (en) 2002-10-31 2010-11-23 Weatherford/Lamb, Inc. Rotating control head radial seal protection and leak detection systems
US7934545B2 (en) 2002-10-31 2011-05-03 Weatherford/Lamb, Inc. Rotating control head leak detection systems
US8353337B2 (en) 2002-10-31 2013-01-15 Weatherford/Lamb, Inc. Method for cooling a rotating control head
US7165610B2 (en) 2003-09-24 2007-01-23 Cameron International Corporation Removable seal
US20050061499A1 (en) * 2003-09-24 2005-03-24 Cooper Cameron Corporation Removable seal
EP1519003A1 (en) * 2003-09-24 2005-03-30 Cooper Cameron Corporation Removable seal
US8701796B2 (en) 2004-11-23 2014-04-22 Weatherford/Lamb, Inc. System for drilling a borehole
US7926593B2 (en) 2004-11-23 2011-04-19 Weatherford/Lamb, Inc. Rotating control device docking station
US9404346B2 (en) * 2004-11-23 2016-08-02 Weatherford Technology Holdings, Llc Latch position indicator system and method
US20140367114A1 (en) * 2004-11-23 2014-12-18 Weatherford/Lamb, Inc. Latch position indicator system and method
US20090139724A1 (en) * 2004-11-23 2009-06-04 Weatherford/Lamb, Inc. Latch position indicator system and method
US8939235B2 (en) 2004-11-23 2015-01-27 Weatherford/Lamb, Inc. Rotating control device docking station
US8826988B2 (en) * 2004-11-23 2014-09-09 Weatherford/Lamb, Inc. Latch position indicator system and method
US9784073B2 (en) 2004-11-23 2017-10-10 Weatherford Technology Holdings, Llc Rotating control device docking station
US8408297B2 (en) 2004-11-23 2013-04-02 Weatherford/Lamb, Inc. Remote operation of an oilfield device
US20150218898A1 (en) * 2004-11-30 2015-08-06 Mako Rentals, Inc. Downhole swivel apparatus and method
US8931560B2 (en) * 2004-11-30 2015-01-13 Mako Rentals, Inc. Downhole swivel apparatus and method
US20140360730A1 (en) * 2004-11-30 2014-12-11 Mako Rentals, Inc. Downhole swivel apparatus and method
US8720577B2 (en) * 2004-11-30 2014-05-13 Mako Rentals, Inc. Downhole swivel apparatus and method
US9834996B2 (en) * 2004-11-30 2017-12-05 Mako Rentals, Inc. Downhole swivel apparatus and method
US9347283B2 (en) * 2004-11-30 2016-05-24 Mako Rentals, Inc. Downhole swivel apparatus and method
US20130175043A1 (en) * 2004-11-30 2013-07-11 Mako Rentals, Inc. Downhole swivel apparatus and method
EP1856371A1 (en) * 2005-02-21 2007-11-21 AGR Subsea AS Centralization and running tool and method
EP1856371A4 (en) * 2005-02-21 2011-09-07 Agr Subsea As Centralization and running tool and method
US8387701B2 (en) * 2007-04-05 2013-03-05 Schlumberger Technology Corporation Intervention system dynamic seal and compliant guide
US20100163243A1 (en) * 2007-04-05 2010-07-01 Andrea Sbordone Intervention system dynamic seal and compliant guide
US7635034B2 (en) 2007-08-27 2009-12-22 Theresa J. Williams, legal representative Spring load seal assembly and well drilling equipment comprising same
US7559359B2 (en) 2007-08-27 2009-07-14 Williams John R Spring preloaded bearing assembly and well drilling equipment comprising same
US7766100B2 (en) 2007-08-27 2010-08-03 Theresa J. Williams, legal representative Tapered surface bearing assembly and well drilling equiment comprising same
US7789172B2 (en) 2007-08-27 2010-09-07 Williams John R Tapered bearing assembly cover plate and well drilling equipment comprising same
US7997345B2 (en) 2007-10-19 2011-08-16 Weatherford/Lamb, Inc. Universal marine diverter converter
US8844652B2 (en) 2007-10-23 2014-09-30 Weatherford/Lamb, Inc. Interlocking low profile rotating control device
US8286734B2 (en) 2007-10-23 2012-10-16 Weatherford/Lamb, Inc. Low profile rotating control device
US9004181B2 (en) 2007-10-23 2015-04-14 Weatherford/Lamb, Inc. Low profile rotating control device
US8403290B2 (en) * 2008-06-09 2013-03-26 Alberta Petroleum Industries Ltd. Wiper seal assembly
US20090302243A1 (en) * 2008-06-09 2009-12-10 Scott Delbridge Wiper seal assembly
US8770297B2 (en) * 2009-01-15 2014-07-08 Weatherford/Lamb, Inc. Subsea internal riser rotating control head seal assembly
US8322432B2 (en) * 2009-01-15 2012-12-04 Weatherford/Lamb, Inc. Subsea internal riser rotating control device system and method
US9359853B2 (en) 2009-01-15 2016-06-07 Weatherford Technology Holdings, Llc Acoustically controlled subsea latching and sealing system and method for an oilfield device
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