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| Number | Title | Issue Date |
| 4252190 | Wireline stabilization method and apparatus Downhole variations in wireline cable tension are substantially reduced for offshore exploration by means of an auxiliary cable tensioning system preferably installed at the ocean floor wellhead. Part of the lifting force applied to a wireline cable is pr... | 02/24/1981 |
| 4230190 | Blow out preventer handling system A system for testing and installing a blow out preventer on a floating vessel and offshore drilling rigs, although the system may be used on other rotary drilling rigs, is disclosed. Retractable rotary table supporting beams are disposed over the moon poo... | 10/28/1980 |
| 4223738 | Production well-heads for underwater oil wells In a production well-head for an underwater oil well the suspension head of the innermost tubing, which has a frusto conical surface on which the production tube suspension member seats, has a duct leading from the enclosed space between the innermost tub... | 09/23/1980 |
| 4220421 | Subsea wellhead protective enclosure Method and apparatus for protecting subsea wellheads and christmas trees from damage by anchors, fishing nets, trawl boards, and other towed devices. The apparatus includes an annular, rigid protective enclosure with inner and outer walls that define a ho... | 09/02/1980 |
| 4213720 | Tensioning of members A plurality of members such as riser pipes are linked by means of a plurality of cylinders to a frame to which tension is to be applied. Each member is linked to the frame by a separate cylinder and the cylinders are interconnected so that the hydraulic f... | 07/22/1980 |
| 4174000 | Method and apparatus for interfacing a plurality of control systems for a subsea well A system for controlling a plurality of subsea wellhead operators provides a dual set of operator controls having an electrical control cable and a pair of hydraulic control lines from the wellhead to a control center at the surface of the water. A primar... | 11/13/1979 |
| 4149603 | Riserless mud return system A system and method are disclosed which eliminates the use of a riser pipe in underwater drilling operations. The system includes a mud sump connectable to the top of a submerged wellhead and has a bottom with a mud inlet provided therein and an upwardly ... | 04/17/1979 |
| 4130161 | Underwater Christmas tree An underwater Christmas tree for controlling flow from an offshore well is disclosed as having a master valve which is controlled by fluid pressure within a flow-line extending from a production bore of the tree, and means for receiving and releasably ret... | 12/19/1978 |
| 4125162 | Well flow system and method A well system and method of installation and operation for two-way communication between a service facility and a remotely located well head such as associated with an offshore well for such well functions as production of well fluids by gas lift. The sys... | 11/14/1978 |
| 4010798 | Method and apparatus for completing underwater well heads In a method of completing one or a plurality of grouped underwater oil wells, each well head to be connected is temporarily placed in a gaseous medium at atmospheric pressure during connection to effect this, prior to the installation of the well head, a ... | 03/08/1977 |
| 3991824 | Offshore well drilling, completion and production A method and apparatus useful in the drilling, completion and production of offshore wells such as oil and gas wells wherein the surface layer of the floor of the body of water in which the well is to be located is a soft flowable material. A well conduct... | 11/16/1976 |
| 3971576 | Underwater well completion method and apparatus Extended casing method and apparatus for completing an underwater well whereby complete and continuous pressure control is maintained at the surface drilling platform. A conductor casing is installed in the floor of a body of water with a casing head and ... | 07/27/1976 |
| 3970147 | Method and apparatus for annulus pressure responsive circulation and tester valve manipulation A releasably locked closed circulation valve is introduced into a well bore as part of a drill string. The annulus between the drill string and the well bore, or casing affixed to the well bore, is sealed. Pressure is applied to the annulus and the valve ... | 07/20/1976 |
| 3967647 | Subsea control valve apparatus A control valve apparatus adapted to be positioned within a subsea blowout preventer stack for controlling the flow of fluid from an offshore well includes a control unit releasably latched to a valve body having tandem, normally closed valve assemblies, ... | 07/06/1976 |
| 3964543 | Underwater wellhead completions with portable atmospheric cellar This invention concerns means for protecting a marine wellhead (including the Christmas tree) on an offshore hydrocarbon-producing platform from damage due to fire. Special means are provided to place the wellhead a small depth, e.g., 25 to 50 feet, below... | 06/22/1976 |
| 3957079 | Valve assembly for a subsea well control system A valve assembly for controlling the flow of hydraulic fluid through a subsea control system providing hydraulic control of underwater equipment and having a female member adapted to be connected to the underwater equipment and having a retrievable male m... | 05/18/1976 |
| 3955623 | Subsea control valve apparatus A control valve apparatus adapted to be stationed in a subsea blowout preventer stack and used in connection with a production or drill stem test of an offshore well from a floating vessel, includes a valve section and a control section that are releasabl... | 05/11/1976 |
| 3941189 | Subsurface wellhead shield This invention concerns means for protecting a marine wellhead (including the Christmas tree) on an offshore hydrocarbon-producing platform from damage due to fire. Special means are provided to protect a wellhead placed a small depth, e.g., 25 to 50 feet... | 03/02/1976 |
| 3933202 | Apparatus for setting and locking packing assemblies in wellheads Running apparatus is releasably connected to a packing assembly, the combination being lowered on a tubular running string until the packing assembly is disposed between a hanger body and a surrounding wellhead underlying a body of water. The apparatus is... | 01/20/1976 |
