Abstract: Systems, methods, and computer program products are configured to apply k-anonymity to an answer to a query sent to a relational database. A query to the relational database is obtained, the relational database containing a plurality of records. A frequency of occurrence of the attributes in the relational database is determined, an anonymization rule set is created based on the frequency of occurrence of the attributes, the anonymization rule set defining which attributes are to be suppressed in the answer to the query, the anonymization rule set is used to generate the answer to the query, wherein the answer to the query has k-anonymity, and a display or other device is controlled based on the answer to the query.

Abstract: A spar hull centerwell arrangement wherein an adjustable buoyancy centerwell device (ABCD) is disposed within the centerwell of the structure. The adjustable buoyancy centerwell device is rigidly connected to the interior walls of the hard tank and defines an adjustable buoyancy centerwell device within the centerwell. The adjustable variable buoyancy unit is a water and airtight buoyancy chamber that allows the interior ballast to be changed as required. This device can also be used as a storage unit for on board fluids and other produced hydrocarbons.

Abstract: A semi-submersible platform for offshore operations includes a buoyant hull including an adjustably buoyant base and a plurality of adjustably buoyant columns extending vertically from the base. In addition, the platform includes a deck moveably coupled to the columns. The deck is configured to move vertically up and down relative to the hull.

Abstract: A floating spar hull for offshore oil and natural gas exploration and production having a centerwell arrangement wherein a supporting wellbay deck is positioned in the centerwell at a level below the uppermost portion of the spar hull in the centerwell. The wellbay deck is attached to the spar hull by any suitable means such as shear plates such that a space remains between the deck and the spar hull for risers. This allows equipment to be placed below the uppermost deck of the topsides and eliminates or minimizes wind loads on the equipment.

Abstract: A mooring disconnect arrangement for a floating offshore structure and a mooring buoy. At least one high pressure water jet is positioned to direct water between the floating offshore structure and the mooring buoy. The floating offshore structure and mooring buoy are also provided with specially shaped complementary surfaces to assist in disconnection and separation. One or more mechanical restraining devices may be used to retain the floating offshore structure and mooring buoy connected together during normal drilling or production operations.

Abstract: A floating spar hull for offshore oil and natural gas exploration and production having a centerwell arrangement wherein a supporting wellbay deck is positioned in the centerwell at a level below the uppermost portion of the spar hull in the centerwell. The wellbay deck is attached to the spar hull by any suitable means such as shear plates such that a space remains between the deck and the spar hull for risers. This allows equipment to be placed below the uppermost deck of the topsides and eliminates or minimizes wind loads on the equipment.

Abstract: A spar hull centerwell arrangement wherein an adjustable buoyancy centerwell device (ABCD) is disposed within the centerwell of the structure. The adjustable buoyancy centerwell device is rigidly connected to the interior walls of the hard tank and defines an adjustable buoyancy centerwell device within the centerwell. The adjustable variable buoyancy unit is a water and airtight buoyancy chamber that allows the interior ballast to be changed as required. This device can also be used as a storage unit for on board fluids and other produced hydrocarbons.

Abstract: A truss type spar that eliminates the need for the more complex and critical attachment of the buoyant hull to the truss section at a fabrication site/yard that is remote from the fabrication yard where the buoyant hull and truss sections were originally built. The buoyant hull and initial truss sections are constructed at the fabrication yard of choice, joined together, and transported to a dock or fabrication yard (a second location) that is as close as possible to the final offshore installation site. Transport of such completed structures, either separately or together, is normally done on a heavy lift vessel to reduce transport time and prevent damage to the buoyant hull and truss sections. Once at the fabrication yard/dock, the joined buoyant hull and initial truss section are floated off the heavy lift vessel and the draft adjusted to a position suitable for joining additional truss sections.

Abstract: A riser disconnect and support mechanism for flexible risers and umbilicals on an offshore structure with low under keel clearance. A main body portion includes an inverted and truncated conical or convex section substantially at the center of the main body portion. The main body portion and conical section receive risers therethrough by means of a plurality of conduits through the main body portion and conical section. A plurality of projections extend radially outward from the main body portion. A plurality of arch-shaped riser supports are provided on each projection to support risers and/or umbilical lines and control their bending radii. The projections extend out from the main body portion at a distance that allows the portions of the risers below the main body portion to hang at an angle and bend radius in accordance with the design tolerances of the risers to prevent buckling or damage due to excessive bending while keeping the risers from contacting the sea floor.

Abstract: A means for applying a controlled tension to a top tension riser on a floating offshore structure. The invention combines a mechanical tensioner device and buoyancy can to apply controlled tension to an individual riser or group of risers supported by a floating offshore structure. The buoyancy can applies static tension force on the riser(s).