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| Number | Title | Issue Date |
| 4903774 | Annulus shut-off mechanism An annulus shut-off mechanism with fail-as-is logic suitable for use for example, in a concentric tubing hanger of an oil well, particularly a sub-sea well, has an enclosure across the annulus with inlet and exit ports, a sleeve with an aperture that slid... | 02/27/1990 |
| 4887672 | Subsea wellhead with annulus communicating system An improved subsea wellhead including a wellhead housing landed at a subsea well location and having a plurality of hangers landed therein, each of the hangers having a seal assembly to define an annulus in the area between the exterior of the hanger and ... | 12/19/1989 |
| 4880060 | Valve control system A hydraulic control system for controlling a retainer valve in an underwater well test system. The control system is contained in a housing in the test string above the retainer valve. The control system and valve are operated by a surface control manifol... | 11/14/1989 |
| 4848473 | Subsea well choke system A subsea well choke system is disclosed. The well choke system has annulus and tubing access as well as wing lines for connections to flow lines. A pressure control valve is installed in the tree cap for easy replacement and also to facilitate pigging and... | 07/18/1989 |
| 4848475 | Sea bed process complex A sea bed oil producing and processing complex has a template with three bays housing pairs of modules, viz, well, gas and oil production modules. The complex includes a separator for separating oil and gas and a pump for the produced oil, and bars having... | 07/18/1989 |
| 4830541 | Suction-type ocean-floor wellhead A wellhead apparatus and a method for positioning the apparatus on the ocean floor in combination with means for sinking it into the ocean floor. The wellhead apparatus is equipped with a venturi suction device and a central opening for receiving a well c... | 05/16/1989 |
| 4794988 | Surface wellhead Surface wellhead apparatus for use in tying-back casing from a subsea structure to a surface structure or when drilling with mudline-supported casing hangers wherein the casing is maintained in tension by means of a lock member which releasably engages wi... | 01/03/1989 |
| 4754813 | Tree capless cone seal manifold Disclosed is a production tree (10) with a top block (mandrel) (12) of the tree provided with a cone-shaped male connector member (14) which also functions as a manifold, and called a cone seal manifold, by having a plurality of shuttle valves (66) which,... | 07/05/1988 |
| 4751968 | Wellhead stabilizing member with deflecting ribs A metal support ring is located between a housing and a wellhead for reducing bending movement of the wellhead relative to the housing. The support ring has a plurality of circumferentially extending ribs for engaging the bore of the housing. The ribs are... | 06/21/1988 |
| 4749046 | Well drilling and completion apparatus A drilling template for multiple wells has a dummy post on the template associate with each wellhead position and a wellhead connector is transferable between the dummy post and wellhead during completion and workover operations. A subsea wellhead is prov... | 06/07/1988 |
| 4742874 | Subsea wellhead seal assembly An improved annular seal between tubular members in a subsea wellhead having an annular seal member with a U shape in section with the opening facing upwardly and two interengaged annular wedges for energizing the sealing surfaces of the inner and outer p... | 05/10/1988 |
| 4741402 | Subsea hydraulic connector with multiple ports A subsea hydraulic coupling has a pair of vertically spaced apart receptacles, each mounted to a different subsea well subassembly. A connector is lowered from the surface into engagement with the receptacles. The receptacles have radial ports. The connec... | 05/03/1988 |
| 4721415 | Well base in ocean floor A wellhead apparatus and a method for positioning the apparatus on the ocean floor. The wellhead apparatus is equipped with a removable pump and a central opening for receiving a well conductor pipe. The apparatus provides a well base structure that is hi... | 01/26/1988 |
| 4710061 | Offshore well apparatus and method An improvement in an offshore well having a main casing penetrating subterranean formations below the bottom of the water and protruding upwardly through the water with a wellhead affixed above the surface of the water and a boat landing connected with th... | 12/01/1987 |
| 4691780 | Subsea wellhead structure A subsea wellhead structure including a casing hanger having an exterior downwardly facing shoulder for landing within a well bore, a central bore, means for connecting a casing thereto, an upper exterior surface tapering downwardly and outwardly, and an ... | 09/08/1987 |
| 4691781 | Well drilling and completion apparatus A drilling template for multiple wells has a dummy post on the template associate with each wellhead position and a wellhead connector is transferable between the dummy post and wellhead during completion and workover operations. A subsea wellhead is prov... | 09/08/1987 |
| 4688633 | Wellhead connecting apparatus A coupling assembly for detachably connecting a pair of wellhead members, includes couplable first and second coupling members. Each coupling member has a central axial bore for accommodating a drill string, and each coupling member is adapted for axially... | 08/25/1987 |
| 4651830 | Marine wellhead structure The present invention relates to an improved subsea wellhead structure which includes a conductor casing having an internal upwardly facing shoulder, and an internal groove above the shoulder, an external groove, a wellhead housing having an external down... | 03/24/1987 |
| 4640647 | Offshore well apparatus and method An improvement in an offshore well having a main casing penetrating subterranean formations below the bottom of the water and protruding upwardly through the water with a wellhead affixed above the surface of the water and a boat landing connected with th... | 02/03/1987 |
| 4632188 | Subsea wellhead apparatus An improvement in a subsea wellhead apparatus that includes the conventional plurality of strings of conduit suspended in a borehole penetrating subterranean formations below the bottom of a sea at which the wellhead apparatus will be placed and the conve... | 12/30/1986 |
| 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 |
| 4625806 | Subsea drilling and production system for use at a multiwell site A subsea drilling and production system where the production unit is removably connected onto a drilling template and operatively connected to one or more Christmas trees so that the production unit may be disconnected from the trees and removed from the ... | 12/02/1986 |
| 4611661 | Retrievable exploration guide base/completion guide base system A system for connecting an exploratory well into a producing well by retrieving a permanent guide base (P) and replacing the same with a completion guide base (C) containing the necessary equipment for producing from the well. To do this, the permanent gu... | 09/16/1986 |
| 4607701 | Tree control manifold Disclosed is a manifold control system 80 for a completion tree 10 comprising a manifold plate 92 having a plurality of single port or multi-port two position spring biased piston type valve cartridges 82 mounted thereon, which individually route hydrauli... | 08/26/1986 |
| 4596375 | Hydraulic control of subsea well equipment A control system (10) employable for purposes of effecting the operation of a plurality of actuable devices, which are located at a subsea site, from a position that is remote therefrom. More specifically, the subject control system (10) is particularly s... | 06/24/1986 |
| 4518042 | Subsea wellhead connection assembly A wellhead connector assembly for use on undersea template platform where a plurality of wellheads are connected to a center work enclosure hull having a plurality of penetration connectors projecting from its sidewall. The present assembly has a connecto... | 05/21/1985 |
| 4499950 | Wellhead stabilization A sub-sea well assembly has features to eliminate side-to-side movement between a wellhead and a wellhead housing due to movement of the drilling vessel. The wellhead extends into the wellhead housing and is connected on its upper end to equipment extendi... | 02/19/1985 |
| 4497369 | Hydraulic control of subsea well equipment A control system (10) employable for purposes of effecting the operation of a plurality of actuable devices, which are located at a subsea site, from a position that is remote therefrom. More specifically, the subject control system (10) is particularly s... | 02/05/1985 |
| 4487527 | Subsea wellhead assembly A subsea wellhead assembly for areas subject to iceberg scouring including an upper conductor in a well bore and a lower conductor in the well bore with the upper end of the lower conductor being within the lower end of the upper conductor and connected t... | 12/11/1984 |
| 4476934 | Retractable stinger purge valve A subsea well assembly has features that allow a riser string leading to the surface to be purged of well fluids prior to pulling the riser string. The well assembly includes a riser connector that seats on a Christmas tree. The Christmas tree and connect... | 10/16/1984 |
| 4475600 | Subsea well completion apparatus A completion system or tree system for a subsea well having an anchor base on bottom surrounding a well bore, a conductor pipe lining the upper end of the well bore and connecting to the anchor base, a guide base landed on the anchor base and having an up... | 10/09/1984 |
| 4456073 | Flexible connection apparatus A flexible connection apparatus is disclosed for accommodating relative movement between a compliant offshore structure and the sea floor. The compliant offshore structure supports a fluid-carrying system which conveys fluids between the sea floor and the... | 06/26/1984 |
| 4442900 | Subsea well completion system A subsea well completion system, and components of such a system, are disclosed for handling marine well fluids from multiple subsea wells. The system includes a fluid-tight work enclosure hull containing manifold means, the hull having a plurality of rad... | 04/17/1984 |
| 4438817 | Subsea well with retrievable piping deck An apparatus and method for drilling and completing a subsea well located at the seabed using a retrievable piping deck. The apparatus includes a template supported on the seabed, the retrievable piping deck supported on the template, a plurality of wellh... | 03/27/1984 |
| 4437521 | Subsea wellhead connection assembly and methods of installation A subsea wellhead connection assembly for establishing fluid communication and production capability between a subsea wellhead and an adjacent subsea manifold system. The assembly includes conduit means for fluidly connecting the wellhead and the manifold... | 03/20/1984 |
| 4427072 | Method and apparatus for deep underwater well drilling and completion A method and apparatus for remotely establishing an underwater well under conditions of great water depth including a drilling guide structure located on the floor of the body of water; a single handling and guiding string extending upwardly from the dril... | 01/24/1984 |
| 4387771 | Wellhead system for exploratory wells A wellhead (16) for an exploratory well carries a latch profile ring (24) at a location just above the wellhead housing (14). Accessory modules (38) latch onto this profile (36) while leaving the conventional upper latch profile (28) free for conventional... | 06/14/1983 |
| 4378848 | Method and apparatus for controlling subsea well template production systems Method and apparatus for remotely controlling subsea template production systems having a plurality of satellite wells and a plurality of subsea trees on the well templates uses a significantly reduced number of electrical and hydraulic lines between a su... | 04/05/1983 |
| 4323118 | Apparatus for controlling and preventing oil blowouts Apparatus for controlling and preventing an oil blowout comprising a hollow frustoconical dome which is disposable over the end of a well discharge pipe or an offshore rig discharge pipe. At the top of the hollow dome is an axially disposed main valve for... | 04/06/1982 |
| 4260022 | Through the flow-line selector apparatus and method A through the flowline or "TFL" tool selector has a base provided with a number of spaced flowline ports and a diverter tube shiftably mounted in a housing for selective communication with the flowline ports. The base is mounted on a remotely operable con... | 04/07/1981 |
