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| Number | Title | Issue Date |
| 8123438 | Ram style tensioner A riser tensioner configured to apply a tension to a riser. The riser tensioner includes a frame configured to be fixedly attached to the riser; plural cylinder assemblies spaced around the riser, each cylinder assembly having a cylinder and a piston configured to s... | 02/28/2012 |
| 8083440 | Riser tensioner restraint device An apparatus to restrain a riser tensioner of an offshore drilling rig includes a restraint cone configured to fit within hydraulic cylinders of the riser tensioner, a hoist configured to extend and retract the restraint cone, and a tension member extending from a l... | 12/27/2011 |
| 8011858 | Ram style tensioner with fixed conductor and floating frame A riser tensioner for an offshore floating platform has a frame stationarily mounted to the upper portion of the riser. Pistons and cylinders are spaced circumferentially around the riser and connected between the frame and the floating platform. A tubular guide mem... | 09/06/2011 |
| 7988385 | Ram style tensioner with fixed conductor and floating frame A riser tensioner for an offshore floating platform has a frame stationarily mounted to the upper portion of the riser. Pistons and cylinders are spaced circumferentially around the riser and connected between the frame and the floating platform. A tubular guide mem... | 08/02/2011 |
| 7980786 | Dual pressure tensioner system A tensioner system is described for oil and natural gas floating platforms and floating vessels having a plurality of self contained dual pressure cylinders for adjusting simultaneously low and high pressures in low pressure and high pressure channels, wherein the t... | 07/19/2011 |
| 7980787 | Dual pressure tensioner method A method for tensioning for oil and natural gas floating platforms and floating vessels using a plurality of self contained dual pressure cylinders for adjusting simultaneously low and high pressures in low pressure and high pressure channels. The method can be used... | 07/19/2011 |
| 7976247 | Dual pressure cylinder A self contained dual pressure cylinder for use in tensioner assemblies for oil and natural gas floating vessels. The self contained dual pressure cylinder can have a high pressure outer barrel surrounding a high pressure inner barrel, forming a high pressure gas ch... | 07/12/2011 |
| 7708498 | Soft stop for maximum riser tensioner stroke A riser is connected to subsea well equipment and extends to a vessel. A tubular conductor is mounted stationarily to and around the riser, the conductor passing through an opening in the vessel. A set of rollers is mounted to the vessel around the opening for engag... | 05/04/2010 |
| 7632044 | Ram style tensioner with fixed conductor and floating frame A riser tensioner for an offshore floating platform has a frame stationarily mounted to the upper portion of the riser. Pistons and cylinders are spaced circumferentially around the riser and connected between the frame and the floating platform. A tubular guide mem... | 12/15/2009 |
| 7588393 | Method for supporting top tension drilling and production risers on a floating vessel A method for supporting top tension drilling and production risers on a floating vessel using a tensioner assembly above the water line of the vessel. The method can include attaching at least one hydraulic cylinder on a first end to a first position on a floating v... | 09/15/2009 |
| 7438505 | Heave compensated snubbing system and method A heave compensation system to enable the transfer of tubulars between a floating platform and a snubbing jack. The heave compensation system includes a first end connected to the floating platform and a second end in connection with a traveling slip assembly of the... | 10/21/2008 |
| 7434624 | Hybrid tension-leg riser This invention provides a production riser system that enables fluid communication in a deepwater drilling environment through the use of a variable buoyancy device supporting both a hybrid riser tower and an steel catenary riser (SCR) system. Fluid communication is... | 10/14/2008 |
| 7416025 | Subsea well communications apparatus and method using variable tension large offset risers Disclosed are compliant variable tension risers (106) to connect deep-water subsea wellheads (102) to a single floating platform (104) in wet tree or dry try systems. The variable tension risers (106) allow several subsea wellheads (10... | 08/26/2008 |
| 7389818 | Method and device by a displacement tool A method and device for use in the replacing of liquid in a riser (12) of the kind used in the recovery of petroleum offshore, wherein the riser (12) forms a connection between a wellhead (4) on or above the sea floor (6) and a drilling v... | 06/24/2008 |
| 7373985 | Two-part telescopic tensioner for risers at a floating installation for oil and gas production A tensioning device (15) for a riser (5) connecting a subsea borehole (7) with a floating installation (1) on the surface of the sea (11), where the tensioning device (15) is provided with telescoping tubes (27, 27′... | 05/20/2008 |
| 7367750 | Riser installation vessel and method of using the same A vessel for exploration of hydrocarbons includes one or more risers extending from the vessel to the seabed, a hydrocarbon processing unit connected to the one or more risers and to a storage or transport structure for storing the processed hydrocarbons. The vessel... | 05/06/2008 |
| 7337849 | Co-linear tensioner and methods of installing and removing same The invention is directed to a tensioner for providing linear and angular movement of a drilling or production facility relative to a conduit or riser secured to the tensioner and to the wellhead in offshore operations. The tensioner compensates for vessel motion in... | 03/04/2008 |
| 7334967 | Method and arrangement by a workover riser connection A slip joint for a riser between a well and a floating petroleum installation, for example an oil platform. The slip joint includes, an outer pipe and an inner pipe, the pipes arranged to enable telescopic movement relative to one another in order to compensate for ... | 02/26/2008 |
| 7329070 | Ram-type tensioner assembly with accumulators A tensioner assembly having a fully extended position, a fully retracted position and a plurality of extended positions there between, for supporting a riser extending downwardly from a platform to a subsea wellhead. The tensioner assembly can have a riser conductor... | 02/12/2008 |
| 7328747 | Integrated buoyancy joint A buoyancy system includes a plurality of buoyancy joints distributed along a riser system. Each joint can include a riser pipe, an external frame disposed around a riser and a vessel, and a buoyant cladding disposed between the vessel and the frame. ... | 02/12/2008 |
| 7314087 | Heave compensation system for hydraulic workover The present invention relates generally to offshore drilling and production operations, and, more particularly, to marine drilling workover/intervention tensioning and compensating devices and methodologies. A heave compensated hydraulic workover device and/or syste... | 01/01/2008 |
| 7306404 | Device and a method for well intervention A handling device for well intervention, the handling device being releasably connected, in an operative position, to a riser and to a heave compensator which is arranged to maintain a prescribed tensioning of the riser. The handling device comprising: a lower riser... | 12/11/2007 |
| 7293940 | Guide tube for a flexible pipe for transporting hydrocarbons A guide tube for a flexible pipe for transporting hydrocarbons comprising an internal tubular element of a substantially rectilinear section extending along an axis (A) and extended by a free section having a curvature along its length and a wall which is internal w... | 11/13/2007 |
| 7240728 | Expandable tubulars with a radial passage and wall portions with different wall thicknesses A tubular liner including a first tubular portion, a second tubular portion, and an intermediate tapered tubular portion coupled to, and positioned between, the first and second tubular portions. ... | 07/10/2007 |
| 7231981 | Inline compensator for a floating drill rig An apparatus and method for protecting against the problems associated with heave of a floating drilling rig are disclosed. The disclosed invention is a unique inline compensator in which a plurality of cylinders housed within a tubular housing and a plurality of lo... | 06/19/2007 |
| 7225877 | Subsea intervention fluid transfer system A system for subsea transfer of intervention fluids to a subsea intervention apparatus, the system, in certain aspects, including a structure and a frame pivotably mounted thereto, a plurality of frame fluid conduits on the frame for conducting fluid from a connecto... | 06/05/2007 |
| 7219739 | Heave compensation system for hydraulic workover The present invention relates generally to offshore drilling and production operations, and, more particularly, to marine drilling workover/intervention tensioning and compensating devices and methodologies. A heave compensated hydraulic workover device and/or syste... | 05/22/2007 |
| 7217067 | Riser keel joint assembly A riser joint keel assembly. A tapered riser joint is connected to a larger diameter outer sleeve through a connection that allows the tapered section and outer sleeve to function as one unit. In the combined design, the outer sleeve provides the required sliding in... | 05/15/2007 |
| 7210531 | Protective element for a riser segment A protective element for a riser segment, including an elongated buffer body, at least one foot connected with the buffer body, the at least one foot being provided with an engagement part arranged to engage on a main pipe of a riser segment, the distance between th... | 05/01/2007 |
| 7191837 | Motion compensator A motion compensator is used on a floating vessel servicing a subsea well. The motion compensator includes a first frame assembly adapted to be connected to a cable extending from a lifting structure. When connected to the cable, the first frame assembly extends lon... | 03/20/2007 |
| 7191836 | Dry tree subsea well communications apparatus and method using variable tension large offset risers Disclosed are compliant variable tension risers (106) to connect deep-water subsea wellheads (102) to a single floating platform (104). The variable tension risers (106) allow several subsea well-heads (102), in water depths from 4... | 03/20/2007 |
| 7163061 | Apparatus and method for supporting structures on offshore platforms An apparatus for supporting a structure on a platform. The platform may be a floating platform. The apparatus comprises a base frame, wherein the base frame has a first bracket and a second bracket attached thereto. The apparatus further includes a x-axis frame havi... | 01/16/2007 |
| 7156583 | Compensating suspension element configuration A compensating suspension element that includes a flexible cable, a flexible pipe and a catenary riser pipe and a connecting device connecting the flexible cable, the flexible pipe and the riser without buoyancy. ... | 01/02/2007 |
| 7150324 | Method and apparatus for riserless drilling An offshore riserless drilling system drills a subsea borehole from a platform and through a cased borehole. The system comprises a lightweight drill string suspending a bottomhole assembly and extending from the platform downwardly through a depth of water into the... | 12/19/2006 |
| 7140807 | Hybrid composite steel tendon for offshore platform A tendon for an offshore floating platform has a tubular section formed of joints of steel pipe secured together. The tubular section has an interior sealed from sea water to provide buoyancy. A composite fiber section is secured to a lower end of the tubular sectio... | 11/28/2006 |
| 7131496 | Portable drill string compensator A closed system drill string compensator having a hydraulic fluid accumulator, at least one air pressure vessel, and a piston and a piston rod slidably engaged within a cylinder. The drill string compensator provides tensioning force for supporting a drill string an... | 11/07/2006 |
| 7128159 | System and method for limiting vortex-induced vibrations on an offshore production riser The present invention relates to a method and to a system for limiting vortex-induced vibrations on a riser suspended at one end from a support and subjected to substantially transverse fluid flows. The system comprises suspension means (10) for hanging the r... | 10/31/2006 |
| 7112011 | Hydro-pneumatic tensioner with stiffness altering secondary accumulator A hydro-pneumatic tensioner includes a barrel having an inner bore and a pressurized fluid contained within to form at least part of a primary accumulator having a preset volume of gas at a nominal pressure. A piston having a piston rod extending from an aperture in... | 09/26/2006 |
| 7104330 | Marine riser tower This invention relates to a marine riser tower (112, 114) for use in the production of hydrocarbons from offshore wells. The riser tower (112, 114) includes a plurality of fluid conduits, which may comprise production flow lines (P), gas-lift lines (G)... | 09/12/2006 |
| 7100694 | Marine riser tower The invention relates to a marine riser tower having a plurality of rigid metallic conduits bundled together with a metallic tubular core. The conduits may include production lines for hydrocarbons, water injection lines, and/or gas lift lines. A production line or ... | 09/05/2006 |
