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Class Information
Number: 166/368
Name: Wells > Submerged well > Wellhead
Description: Device comprising means at the top of the well, generally extending above the surface of the earth, adapted to cap the well, support the well structure inside a well casing, regulate the operation of the well, and/or supply well fluid for distribution.










Patents under this class:
1 2 3 4 5 6 7 8 9 10

Patent Number Title Of Patent Date Issued
8701786 Positionless expanding lock ring for subsea annulus seals for lockdown Apr. 22, 2014
8684089 Method and system for circulating fluid in a subsea intervention stack Apr. 1, 2014
8684092 System and method for providing additional blowout preventer control redundancy Apr. 1, 2014
8678093 Insertion of a pack-off into a wellhead Mar. 25, 2014
8672038 Retrievable subsea bridge tree assembly and method Mar. 18, 2014
8662185 Active casing hanger hook mechanism Mar. 4, 2014
8662184 Multi-section tree completion system Mar. 4, 2014
8662183 Blow out preventer Mar. 4, 2014
8651185 Reducing or stopping the uncontrolled flow of fluid such as oil from a well Feb. 18, 2014
8651190 Shear boost triggering and bottle reducing system and method Feb. 18, 2014
8640775 Multi-deployable subsea stack system Feb. 4, 2014
8640777 Expandable anchoring mechanism Feb. 4, 2014
8636072 Wellhead assembly having seal assembly with axial restraint Jan. 28, 2014
8631873 Tubing hanger--production tubing suspension arrangement Jan. 21, 2014
8622138 Apparatus and method for recovering fluids from a well and/or injecting fluids into a well Jan. 7, 2014
8622139 Emergency subsea wellhead closure devices Jan. 7, 2014
8622142 Sealing wellhead members with bi-metallic annular seal Jan. 7, 2014
8613323 Wellhead assembly Dec. 24, 2013
8607878 System and method for cathodic protection of a subsea well-assembly Dec. 17, 2013
8602108 Subsea tree safety control system Dec. 10, 2013
8590624 Bridging hanger and seal running tool Nov. 26, 2013
8590625 Subsea completion with a tubing spool connection system Nov. 26, 2013
8590634 Subsea drilling Nov. 26, 2013
8573306 Apparatus and method for recovering fluids from a well and/or injecting fluids into a well Nov. 5, 2013
8567508 Wellhead change-out flange and method of use thereof Oct. 29, 2013
8550167 Remote operated vehicle interface with overtorque protection Oct. 8, 2013
8550168 Stabplate connections Oct. 8, 2013
RE44520 Tubing hanger with annulus bore Oct. 8, 2013
8544551 Methods and devices for isolating wellhead pressure Oct. 1, 2013
8544550 Subsea wellhead with segmented fatigue reduction sleeve Oct. 1, 2013
8544535 Integrated wellhead assembly Oct. 1, 2013
8540016 Control and supply unit Sep. 24, 2013
8540018 Apparatus and method for recovering fluids from a well and/or injecting fluids into a well Sep. 24, 2013
8522864 Stripper blow out preventer for small diameter oil field tubing or small diameter polished rods Sep. 3, 2013
8517089 Casing hanger profile for multiple seal landing positions Aug. 27, 2013
8517112 System and method for subsea control and monitoring Aug. 27, 2013
8511389 System and method for inductive signal and power transfer from ROV to in riser tools Aug. 20, 2013
8490705 Hydraulic control system monitoring apparatus and method Jul. 23, 2013
8485262 Modular, stackable wellhead system Jul. 16, 2013
8485260 Modular backup fluid supply system Jul. 16, 2013
8479824 Power slip assembly for wellhead casing and wellbore tubing Jul. 9, 2013
8479825 Crane device and method Jul. 9, 2013
8479829 Alignment of BOP stack to facilitate use of a rotating control device Jul. 9, 2013
8474537 High capacity wellhead connector having a single annular piston Jul. 2, 2013
8469086 Apparatus and method for recovering fluids from a well and/or injecting fluids into a well Jun. 25, 2013
8469102 Subsea wellhead keyless anti-rotation device Jun. 25, 2013
8443899 Function spool May. 21, 2013
8443898 Wellhead safety device May. 21, 2013
8443897 Subsea safety system having a protective frangible liner and method of operating same May. 21, 2013
8434558 System and method for containing borehole fluid May. 7, 2013

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