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| Number | Title | Issue Date |
| 4832126 | Diverter system and blowout preventer A system is disclosed which may alternatively be used as a diverter or as a blowout preventer for a drilling rig. The system comprises a blowout preventer attached above a spool having a hydraulically driven sleeve/piston. An outlet flow passage in the sp... | 05/23/1989 |
| 4828024 | Diverter system and blowout preventer A system is disclosed which may alternatively be used as a diverter or as a blowout preventer for a drilling rig. The system comprises a blowout preventer attached above a spool having a hydraulically driven sleeve/piston. An outlet flow passage in the sp... | 05/09/1989 |
| 4753485 | Solution mining A method for enhanced mineral recovery from a subsurface earth formation is disclosed. An outer loop borehole is formed from a vertical shaft. A leaching fluid is injected from the surface to the outer loop borehole to leach away minerals in proximity wit... | 06/28/1988 |
| 4719937 | Marine riser anti-collapse valve A marine riser anticollapse valve is disclosed for preventing a marine riser from collapsing under external sea water pressure in the event of a sudden loss of internal drilling fluid pressure. An external valve structure is provided for each of a plurali... | 01/19/1988 |
| 4708513 | Fatigue resistant coupling for tubular members An extended lift coupling for joining tubular members in an end-to-end relationship is disclosed. The coupling is of simple design having only three components: a pin, a box and a threaded lock ring. An external compressive axial preload places a torus on... | 11/24/1987 |
| 4703807 | Rotatable ball valve apparatus and method A safety valve and method is disclosed having a housing in which a rotatable valve is disposed between upper and lower passages and lateral outlets. The ball has a removable insert such that in one position of the ball, the insert can be removed to provid... | 11/03/1987 |
| 4681133 | Rotatable ball valve apparatus and method A safety valve and method is disclosed having a housing in which a rotatable valve is disposed between upper and lower passages and lateral outlets. The ball has a removable insert such that in one position of the ball, the insert can be removed to provid... | 07/21/1987 |
| 4679800 | Hawser chain seal assembly A hawser chain assembly and method for installation of its sealing element is disclosed. The assembly includes a housing adapted for connection in series with a hawser pipe of a marine vessel such as a semi-submersible drilling rig. The housing may be mov... | 07/14/1987 |
| 4668126 | Floating drilling rig apparatus and method The invention relates to a method and apparatus for remotely connecting or disconnecting upper flexible choke/kill lines (including auxiliary lines) to choke/kill lines of a floating drilling rig riser which has been lowered toward the sea floor. Remote s... | 05/26/1987 |
| 4662659 | Tubular joint with trapped mid-joint metal-to-metal seal having unequal tapers A joint and male and female tubular elements are disclosed where the threads of the female and male members have negative load flanks and have two or more radial steps axially separated one from another by a reverse angle torque shoulder having one or two... | 05/05/1987 |
| 4657263 | Annular packing unit and insert A packer unit and packer insert adapted for use in an annular blowout preventer. The packer insert includes a generally longitudinal web with its leading edge facing the axial bore of the packing unit sloping from top to bottom in a generally radially out... | 04/14/1987 |
| 4646844 | Diverter/bop system and method for a bottom supported offshore drilling rig A system adapted for alternative use as a diverter or a blowout preventer for a bottom supported rig and adapted for positioning beneath a rotary table of the drilling rig is disclosed. The system comprises a fluid flow controller and at least two bases a... | 03/03/1987 |
| 4647002 | Ram blowout preventer apparatus A top seal, ram assembly, blowout preventer, and housing for a blowout preventer are disclosed according to the invention in which outer anti-extrusion plates are provided at the ends of the top seal which are adapted for bearing against a surface of the ... | 03/03/1987 |
| 4646836 | Tertiary recovery method using inverted deviated holes A method for enhanced oil recovery from a subsurface earth formation is disclosed. At least one essentially upward deviated hole from a vertical shaft in the formation is formed. An outer loop borehole is formed in proximity with the deviated hole. A heat... | 03/03/1987 |
| 4646083 | Borehole measurement and telemetry system A measuring and telemetry system is disclosed adapted to measure the ambient pressure and temperature in a downhole environment, and to telemeter signals representative of such measurements to the wellhead for demodulation and display. Only two wires are ... | 02/24/1987 |
| 4635678 | Flow control apparatus A flow control apparatus having a valve body forming a longitudinal axis with an inlet and an outlet connected by flow passage that are all substantially disposed on the longitudinal axis to provide a straight flow path is disclosed. A moveable flow contr... | 01/13/1987 |
| 4630680 | Well control method and apparatus A method and apparatus is disclosed for controlling a well drilled from a floating drilling vessel during the time that the marine riser is removed and conductor casing is being lowered and cemented into the well. An annular blowout preventer having a bor... | 12/23/1986 |
| 4629224 | Tubular connection A tubular joint or connector of box and pin members is disclosed having two-step tapered threads. Two metal-to-metal seals of complementary engaging sealing surfaces are provided, one adjacent the end of the pin member, the other axially disposed between ... | 12/16/1986 |
| 4626135 | Marine riser well control method and apparatus This invention provides a method and apparatus for maintaining safe pressure in the annulus of a deepwater marine riser by preventing the displacement of drilling mud with formation gas. By providing an improved flow diverting control device having an ann... | 12/02/1986 |
| 4624488 | Tubular connection An improved pin member adapted for use in a tubular connection where said pin member is adapted for coaxial threaded engagement with a box member having a counterbore for receiving the pin member. A pilot surface is disposed from a distal-proximate end to... | 11/25/1986 |
| 4621655 | Marine riser fill-up valve A marine riser safety valve is disclosed which, when placed in series with a deep water marine riser string, prevents collapse of riser pipe when inadvertent gas influx replaces the drilling fluid column. A cylindrical body is provided having a depression... | 11/11/1986 |
| 4619111 | Oilfield closing device operating system A system including a solid propellant gas generator for generating closing pressure for an oilfield closing device is disclosed. The system provides a reliable source of hydraulic power for emergency operation of blowout preventers, diverters and the like... | 10/28/1986 |
| 4616700 | Automatic well test system and method A well test system for automatically testing a plurality of wells in an oilfield is disclosed. The system includes means for detecting leaking diverter valves. The system also includes means for purging a test separator as a function of the number of free... | 10/14/1986 |
| 4605195 | Annular blowout preventer packing unit An annular blowout preventer packer unit is disclosed having an annulus of elastomeric material in which is embedded metallic drive inserts provided in an outward circle about the axis. Metallic lead inserts are provided in an inward circle about the axis... | 08/12/1986 |
| 4605076 | Method for forming boreholes A method for forming as by drilling multiple boreholes into a shallow hydrocarbon pay zone from a single central vertical borehole is disclosed. A single large diameter vertical hole is first provided between the pay zone to a depth greater than a predete... | 08/12/1986 |
| 4603742 | Subsurface safety valve A tubing retrievable surface controlled subsurface safety valve having a rotatable ball-type flow closure element is disclosed. The ball element is rotationally operated and guided by a pair of guide members fixed in the valve by a stop ring. The guide me... | 08/05/1986 |
| 4603740 | Subsurface safety valve A tubing retrievable surface controlled subsurface safety valve having a rotatable ball-type flow closure element is disclosed. A tubular operator assembly imparts longitudinal movement to the ball greater than the predetermined movement required to effec... | 08/05/1986 |
| 4597447 | Diverter/bop system and method for a bottom supported offshore drilling rig A system and method for installing a fluid flow controller and telescoping spools beneath an offshore bottom supported drilling rig rotary table is disclosed. Upper and lower telescoping spools are provided for initially connecting a Diverter/BOP converti... | 07/01/1986 |
| 4582090 | Tubular member thread protector A thread protector structure is disclosed having a threaded body structure for threading about the threaded end surface of a tubular member. A sealing structure connected to and extending inwardly beyond the thread length has at least one resilient circum... | 04/15/1986 |
| 4580348 | Method of gaging a pipe at multiple locations A workpiece gaging system includes carriage structure for a gaging part, movable longitudinally and laterally, and a rotor to rotate that structure; also indicator means is operatively connected with the part to indicate the status of engagement, displace... | 04/08/1986 |
| 4578669 | Remote switch position indicator A remote sensing and indicating system for monitoring and displaying at a central operating location the state or position of a remotely located multiple state element. The multiple state element may be a subsea valve which may be either in an open state ... | 03/25/1986 |
| 4576358 | Remotely operable safety valve An improved remotely operable safety valve which is adapted for use between the swivel and the kelly is disclosed. An annular hydraulic piston moves the valve to the open and closed position whether or not the drill string is rotating, and in the event of... | 03/18/1986 |
| 4572298 | Gate valve apparatus and method Safety equipment for land or marine well completions is disclosed. In one embodiment of the invention a gate valve is provided in which the gate has a removable insert so that in one position of the valve, the insert can be removed (or inserted) via an up... | 02/25/1986 |
| 4570982 | Tubular joint with trapped mid-joint metal-to-metal seal A joint of male and female tubular elements is disclosed where the threads of the female and male members have negative load flanks and have two or more radial steps axially separated one from another by a reverse angle torque shoulder having one or two a... | 02/18/1986 |
| 4570977 | Mechanical connector apparatus A connector apparatus for releasably securing two separate force transmitting assemblies in a force transfer relationship is disclosed. A first connector assembly having a tubular member forming a central opening having a locking recess formed therein is ... | 02/18/1986 |
| 4569392 | Well bore control line with sealed strength member A flexible control line for communication in a well bore is disclosed having a communication tube and a strength member extending along the tube. The tube and strength member are encapsulated in a sheath of elastomeric material. Sealing means are provided... | 02/11/1986 |
| 4566494 | Vent line system A vent line system is disclosed which is adapted for connection to a flow diverter attached to a drilling rig. The system assures that the vent line is always open for discharge of pressurized drilling fluid away from the drilling rig in one of two direct... | 01/28/1986 |
| 4559711 | Workpiece gaging apparatus A workpiece gaging system includes carriage structure for a gaging part, movable longitudinally and laterally, and a rotor to rotate that structure; also indicator means is operatively connected with the part to indicate the status of engagement, displace... | 12/24/1985 |
| 4558750 | Method and apparatus for forming boreholes A method and apparatus is disclosed for deviated hole drilling upwardly and outwardly from beneath a shallow hydrocarbon formation pay zone. A large diameter vertical hole is first formed as by drilling below the pay zone. A first casing having a directio... | 12/17/1985 |
| 4558716 | Valve body for multiple valve insert packages A choke valve apparatus is accommodated to different conditions of fluid flow (to or from a well, for example) by providing multiple flow control packages each having two flow control units, each package being readily connectible in the same valve body.... | 12/17/1985 |
