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| Number | Title | Issue Date |
| 4960183 | Seismic source firing control system A firing system for marine seismic sources 14 grouped and fired in subarrays 18. Each source 14 is provided with a firing circuit 30 including an energy storage device, such as a storage capacitor 32, adapted to pass firing current through the source actu... | 10/02/1990 |
| 4924099 | Method and apparatus for monitoring a flowstream A method and apparatus utilizing inelastic neutron scattering for measuring the volume fractions of the various constituents of a multiconstituent substance. A source of fast neutrons is positioned proximate the substance. A detection system is provided t... | 05/08/1990 |
| 4881852 | Method and apparatus for tensioning the tethers of a tension leg platform Described herein are a system for securing and tensioning the tethers 12 of a tension leg platform 10 and a TLP installation method incorporating such a system. The tethers 12 preferably extend upward from the ocean bottom 16 to a position slightly below ... | 11/21/1989 |
| 4810135 | Compliant offshore structure with fixed base A compliant offshore structure in which the primary restoring force to lateral displacement is provided by elongate flex elements. A gravity base is rigidly secured to the ocean bottom. A tower extends vertically upward from the base to a position above t... | 03/07/1989 |
| 4808035 | Pneumatic riser tensioner A system for supporting one end of a riser or other elongate element from a marine structure. In the preferred embodiment, a plurality of gas springs are symmetrically disposed about the upper end of a riser. The axis of compression of each gas spring is ... | 02/28/1989 |
| 4785894 | Apparatus for detecting drill bit wear An earth drilling bit incorporating a bit wear indicator. The bit wear indicator includes: a sensor to detect wear at a selected point on the bit; a device for altering the resistance of the bit to receiving drilling fluid from the drill string; and, a te... | 11/22/1988 |
| 4785895 | Drill bit with wear indicating feature An earth drilling bit incorporating a tensioned linkage type bit wear indicator. A tensioned linkage extends through the bit between a wear sensor and a device for altering the resistance of the bit to receiving drilling fluid from the drill string. On de... | 11/22/1988 |
| 4784526 | Arctic offshore structure and installation method therefor An arctic offshore platform adapted for use in hydrocarbon exploration and production operations conducted in relatively shallow waters with low to moderate ice environments. The arctic offshore platform of the present invention includes one or more suppo... | 11/15/1988 |
| 4780266 | Method for detecting drilling fluid in the annulus of a cased wellbore A method for logging a cased well to determine the quantity and location of any barite weighted drilling fluid in the annulus between the casing and the wall of the wellbore. A tool assembly having a neutron generator and a gamma scintillation detector is... | 10/25/1988 |
| 4780026 | Tension leg platform and installation method therefor A tether and tether tensioning system for a tension leg platform. A plurality of elongate tethers 12 are used to secure a tension leg platform hull 20 to a foundation 14 at the ocean floor. Each tether 12 has a lower end secured to the ocean floor foundat... | 10/25/1988 |
| 4721417 | Compliant offshore structure stabilized by resilient pile assemblies A compliant offshore structure in which stabilization against excessive sway is provided by a resilient pile assemblies. A series of drive piles extend into the ocean floor beneath the base of the structure. Drive piles extend upward to a position proxima... | 01/26/1988 |
| 4702636 | System for connecting two members together A coupling 10 for connecting an elongate first member 12 to a second member 14. The first member 12 is provided with external radial fins 16. The second member 14 defines a recess provided with a number of internal radial fins 20. The first and second mem... | 10/27/1987 |
| 4697667 | Debris ejector for a seismic vibrator The present invention is an improvement to conventional baseplates for imparting seismic energy to an earth formation. A baseplate typically has a plurality of downwardly disposed triangular prism-shaped cleats for engagement with the earth surface above ... | 10/06/1987 |
| 4696604 | Pile assembly for an offshore structure A pile assembly adapted for use in a compliant piled tower. A plurality of drive piles are driven into the ocean floor in a symetric array about a central, substantially vertical axis. A flex pile is secured to the upper end of each drive pile and extends... | 09/29/1987 |
| 4696601 | Articulated compliant offshore structure An articulated, compliant offshore structure having a base portion establishing a gravity-type foundation on the ocean bottom, a tower extending upward from the base portion and a deck seated on the tower a spaced distance above the ocean surface. The tow... | 09/29/1987 |
| 4696603 | Compliant offshore platform A complaint offshore platform in which the primary restoring force to lateral displacement is established by flex piles driven into the seafloor and fixedly secured to the platform legs a preselected distance above the seafloor. The platform includes a su... | 09/29/1987 |
| 4695984 | Method for establishing a surface consistent correction for the effects of the low velocity layer in seismic data processing A method useful in seismic data processing for correcting data for the effects of the low velocity layer. At least three sets of traces having common offsets are displayed as a function of centerpoint. From this, the first refraction arrival for each trac... | 09/22/1987 |
| 4671357 | Method of cementing a casing in a borehole A method for cementing a casing into a borehole. The borehole is drilled to the desired depth in the usual manner. Before removing the drill string and without substantially interrupting the flow of fluids in the borehole, the mud therein is displaced wit... | 06/09/1987 |
| 4661017 | Method and apparatus for aligning underwater components A method and apparatus for aligning a component with an underwater receptacle is disclosed. The component is attached to one end of a swing arm having a hook attached to the other end. The swing arm is lowered in the water until the hook engages a pivot a... | 04/28/1987 |
| 4648453 | Process for remedial cementing An improved method is disclosed for remedial cementing operations. Prior to conducting the remedial cementing operation, the zone to be cemented is pretreated with a hydrocarbon solvent capable of dissolving hydrocarbons, such as oils and asphaltenes. Fol... | 03/10/1987 |
| 4630970 | Buoyancy system for submerged structural member A buoyancy system for a tension leg platform tether 10 or other element extending a significant vertical distance through a body of water. A series of bulkheads 25 divide the interior of the tether 10 into individual buoyancy cells 31. A central access tu... | 12/23/1986 |
| 4610161 | Method and apparatus for determining fluid circulation conditions in well drilling operations A method and apparatus for establishing the rate at which fluid is transferred between an offshore well 16 and the formations 20 surrounding the well 16 in the course of drilling the well 16 from a floating drilling rig 14. A drilling fluid handling syste... | 09/09/1986 |
| 4604961 | Vessel mooring system The disclosure describes apparatus for mooring a vessel 10 in unprotected waters. The vessel 10 contains a recess 34 in its hull adapted for receiving a buoyant mooring element 18. The mooring element 18 is attached to the ocean floor 12 by a plurality of... | 08/12/1986 |
| 4576519 | Offshore platform base An improved offshore platform base (12) is disclosed having three sets of substantially parallel bulkheads (24, 26, 28) which intersect one another at about 120° forming a repeatable array of contiguous triangular (30) and hexagonal-shaped (34) chambers.... | 03/18/1986 |
| 4558751 | Apparatus for transporting equipment through a conduit Apparatus 10 for propelling equipment through a fluid-filled conduit 12, such as a pipeline or oil well tubular. The propulsion apparatus incorporates first and second elements 14,16 adapted to be moved in a first axial direction through the conduit 12 an... | 12/17/1985 |
| 4553429 | Method and apparatus for monitoring fluid flow between a borehole and the surrounding formations in the course of drilling operations A method and apparatus for establishing the rate at which fluid is transferred between a borehole 14 and the surrounding formations 16 in the course of moving drill string 20 upward or downward in the borehole 14. A bell nipple 40 is situated at the upper... | 11/19/1985 |
| 4549578 | Coded fluid control system A fluid control system 10 and selector valve 24 for use therein, for controlling a plurality of fluid actuated elements 12, such as valve operators. The fluid actuated elements are controlled from an operating station 52, which is located remotely from th... | 10/29/1985 |
| 4537457 | Connector for providing electrical continuity across a threaded connection A connector 10 is disclosed which is suited for use in effecting an electrical connection between separate conductor bundles 12, 16 in adjacent sections of a threadably sectioned conduit. The connector 10 is especially well suited for use in providing ele... | 08/27/1985 |
| 4531787 | Debris deflector for endless track system This invention concerns a debris deflector (30) primarily useful for vehicles (24) having wheels (14,16) supporting an endless track (12). With no deflector (30) debris accumulates in the endless track (12) impeding vehicle performance. An inverted "V"-sh... | 07/30/1985 |
| 4529334 | Production riser assembly A production riser assembly includes a controlled bending guide and base assembly having a curved bend control surface which cooperates with a tension and bend shaft member associated with a riser pipe, whereby movement of the riser pipe is controlled by ... | 07/16/1985 |
| 4512408 | Moonpool guidance system for drill strings having attached umbilical lines A system for guiding a drill string with an attached umbilical line through a moonpool of a floating structure. The system comprises a support means, and a workhead assembly secured to the outer end of the support means. The workhead assembly is adapted t... | 04/23/1985 |
| 4499380 | Apparatus and method for determining the hydrogen content of a substance Set forth in the accompanying disclosure is an apparatus 10 and method broadly useful for monitoring the concentration of a hydrogenous component within a given sample or space. The specific apparatus disclosed is directed to monitoring steam quality with... | 02/12/1985 |
| 4488599 | Method of controlling displacement of propping agent in fracturing treatments A method of preventing overdisplacement and underdisplacement of proppant during well treatments to hydraulically induce and maintain a fracture in a subterranean formation traversed by a wellbore having a perforated casing. In the practice of the method,... | 12/18/1984 |
| 4475591 | Method for monitoring subterranean fluid communication and migration A method is detailed for obtaining data useful in the analysis of fluid communication and migration between first and second horizons intersected by a wellbore. In the practice of this method, a pressure transducer is fixedly attached to a length of casin... | 10/09/1984 |
| 4473323 | Buoyant arm for maintaining tension on a drilling riser The invention relates to an elongated buoyant arm mounted below the water line of a drilling vessel. The arm is of variable buoyancy and is attached to a drilling riser extending between the drilling vessel and the sea bottom to maintain tension on the ri... | 09/25/1984 |
| 4436450 | Apparatus and method for removing buoyancy modules from submerged pipe Apparatus for releasably attaching a buoyant module to a submerged pipeline and for releasing the module therefrom is disclosed. The apparatus comprises a strap wrapped over the top of the module and around the underside of the pipeline and a link connect... | 03/13/1984 |
| 4421167 | Method of controlling displacement of propping agent in fracturing treatments A method of preventing overdisplacement of propping agent particles during well treatments to hydraulically induce a fracture in a subterranean formation wherein buoyant or neutrally buoyant ball sealers are incorporated in the trailing end portion of the... | 12/20/1983 |
| 4398487 | Fairing for elongated elements A fairing for elongated elements is disclosed for reducing current-induced stresses on the elongated element. The fairing is made as a stream-lined shaped body that has a nose portion in which the elongated element is accommodated and a tail portion. The ... | 08/16/1983 |
| 4398427 | Thin shell pressure sensor A thin shell pressure sensor for sensing in situ pressures in a medium in which the sensor is embedded is provided. The sensor operates on the principle that the membrane stresses near the apex of a thin shell under an external pressure load are proportio... | 08/16/1983 |
| 4391298 | Multiline piggable fluid swivel A piggable fluid swivel comprising a first element on which a second element is rotatably mounted. Grooves in both the first and second elements align to form a continuous flow passage between the elements. Openings are provided through the first and seco... | 07/05/1983 |
