| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
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| 01/09/2013 | CN202659207U Well washing machine with blowout prevention screw pump |
| 01/09/2013 | CN202659206U Heavy oil observation well casing head |
| 01/09/2013 | CN202659205U Multistage casing device |
| 01/09/2013 | CN202659204U Pressure maintaining protection cap |
| 01/09/2013 | CN202659203U Wellhead falling-object preventing device |
| 01/09/2013 | CN202659202U Wellhead nucleus-aligning device |
| 01/09/2013 | CN202659201U Blowout preventer for tripping rod |
| 01/09/2013 | CN202659200U Wellhead tee joint connecting device special for underbanlanced drilling |
| 01/09/2013 | CN202659199U Anti-theft device for oil producing wellhead |
| 01/09/2013 | CN202659198U Fracturing wellhead device |
| 01/09/2013 | CN202659166U Portable right-angled buckling-changing joint for well drilling |
| 01/09/2013 | CN102865050A Permanent prestressed thermosensitive automatic packer |
| 01/09/2013 | CN102865049A Pipe guide arms for blind shear rams |
| 01/09/2013 | CN102865048A Seal assembly with inner and outer seal rings on legs |
| 01/09/2013 | CN102863593A Sludge cake curing agent, and preparation and application method thereof |
| 01/09/2013 | CN102003169B Method for repairing accident well of coal bed methane multi-branch horizontal well |
| 01/09/2013 | CN101906949B Underbalanced well completion tool |
| 01/09/2013 | CN101871333B Hydraulic liner releaser and release method for oil and gas wells |
| 01/09/2013 | CN101852069B Supporting rotating control head of underbalanced coal bed methane well drilling |
| 01/09/2013 | CN101705801B Combined annular blowout preventer |
| 01/09/2013 | CN101427003B Apparatus and method for severing a wellbore tubular |
| 01/08/2013 | US8347970 Wellhead tubular connector |
| 01/08/2013 | US8347966 Seal system and method |
| 01/08/2013 | US8347961 Low heat of hydration cement compositions and methods of using same |
| 01/08/2013 | CA2702936C Nano-sized particles for formation fines fixation |
| 01/08/2013 | CA2697133C Apparatus and method for inserting and retrieving a tool string through well surface equipment |
| 01/08/2013 | CA2693261C Injection plane initiation in a well |
| 01/08/2013 | CA2567632C Downhole isolation tool |
| 01/08/2013 | CA2565861C Wellbore control device |
| 01/07/2013 | CA2789289A1 Oil well drilling fluids, oil well cement composition and slurry of weighting material |
| 01/03/2013 | WO2013002971A2 Blowout preventer seal assembly and method of using same |
| 01/03/2013 | WO2013002848A2 Extrusion-resistant seals for expandable tubular assembly |
| 01/03/2013 | WO2013000048A1 Reinforcement joint for riser columns used in oil extraction |
| 01/03/2013 | WO2012090056A3 Downhole packer tool with antifracture means |
| 01/03/2013 | WO2012090051A3 Downhole packer tool with dummy slips |
| 01/03/2013 | WO2012090050A3 Downhole packer tool with safety systems for preventing undue set and release operations |
| 01/03/2013 | WO2011157996A3 Controlling well operations based on monitored parameters of cement health |
| 01/03/2013 | WO2011148184A3 Well intervention method and apparatus |
| 01/03/2013 | US20130001881 Seal assembly and method of forming a seal assembly |
| 01/03/2013 | US20130000926 Method and apparatus for completing a multi-stage well |
| 01/03/2013 | US20130000920 Hybrid Seal |
| 01/03/2013 | US20130000906 Wellbore laser operations |
| 01/03/2013 | US20130000905 Gellable Treatment Fluids Comprising Amino Group Gel-Time Modifiers and Methods for Use Thereof |
| 01/03/2013 | US20130000904 Cement Retarder and Method of Using the Same |
| 01/03/2013 | US20130000903 Reconfigurable cement composition, articles made therefrom and method of use |
| 01/03/2013 | US20130000891 Radiation-Induced Triggering for Set-On-Command Compositions and Methods of Use |
| 01/03/2013 | US20130000887 Downhole tool with pumpable section |
| 01/03/2013 | US20130000885 Pipe grapple |
| 01/03/2013 | DE102011107822A1 Verschlussvorrichtung für einen defekten Blowout-Preventer Closure device for a defective blowout preventer |
| 01/03/2013 | CA2840439A1 Blowout preventer seal assembly and method of using same |
| 01/03/2013 | CA2840417A1 Well pump with seal section having a labyrinth flow path in a metal bellows |
| 01/03/2013 | CA2837744A1 Through tubing expandable frac sleeve with removable barrier |
| 01/03/2013 | CA2827451A1 Extrusion-resistant seals for expandable tubular assembly |
| 01/02/2013 | EP2540956A1 Blowout preventer and well intervention tool |
| 01/02/2013 | EP2540613A1 Connector device for a feed line |
| 01/02/2013 | EP2539536A2 Drilling system and method of operating a drilling system |
| 01/02/2013 | CN202645525U Fracturing string |
| 01/02/2013 | CN202645511U Horizontal well segmental production string |
| 01/02/2013 | CN202645506U Pulse valve type underground anti-spraying device |
| 01/02/2013 | CN202645502U Unloading valve for well opening safety control system |
| 01/02/2013 | CN202645496U Splash-proof slurry returning groove |
| 01/02/2013 | CN202645495U Cementing pulsation device for well cementation in petroleum engineering |
| 01/02/2013 | CN202645494U Grouting and solidifying device used for layer prone to hole collapse in drilling process |
| 01/02/2013 | CN202645493U Washable well slip type packer |
| 01/02/2013 | CN202645492U Double-layered casing window composite type dual-grip hydraulic packer |
| 01/02/2013 | CN202645491U Multifunctional universal short-section type blowout preventer for oil well, gas well and water well |
| 01/02/2013 | CN202645490U Compression and expansion sliding sleeve type downhole blowout preventer |
| 01/02/2013 | CN202645489U Combined type blowout preventer with locking function |
| 01/02/2013 | CN202645488U Multipurpose well packer |
| 01/02/2013 | CN102859111A High strength dissolvable structures for use in a subterranean well |
| 01/02/2013 | CN102852507A Accurate sand-filling layered optimization design method for continuous oil pipe |
| 01/02/2013 | CN102852482A Hybrid seal |
| 01/02/2013 | CN102852481A Multipurpose integral cross joint |
| 01/02/2013 | CN102852467A Separate zone production technical string capable of protecting oil reservoirs |
| 01/02/2013 | CN102051161B Thick oil huff and puff deep channel blocking system and injection method thereof |
| 01/02/2013 | CN101769138B Leak-proof method of circulating fluid of oil well |
| 01/02/2013 | CN101575955B Design method of low-pressure gas well swabbing damper |
| 01/01/2013 | US8343894 Controlled variable density fluid for wellbore operations |
| 01/01/2013 | US8342251 Shoe for wellbore lining tubing |
| 01/01/2013 | US8342244 Methods and apparatuses for releasing a chemical into a well bore upon command |
| 01/01/2013 | US8342243 Method for stage-cementing an oil well |
| 01/01/2013 | US8342242 Use of micro-electro-mechanical systems MEMS in well treatments |
| 01/01/2013 | US8342239 Swellable downhole packer |
| 01/01/2013 | US8342237 Stuffing box leak containment apparatus |
| 12/27/2012 | WO2012178214A2 Pump drain arrangements for packer systems and methods for sampling underground formations using same |
| 12/27/2012 | WO2012178203A2 Expandable filtering system for single packer systems |
| 12/27/2012 | WO2012177926A2 Liner top packer for liner drilling |
| 12/27/2012 | WO2012177358A1 Cementing tool |
| 12/27/2012 | WO2012177315A1 Interventionless set packer and setting method for same |
| 12/27/2012 | WO2012175695A1 An annular barrier with external seal |
| 12/27/2012 | WO2012175540A1 Plant for exploiting reservoirs of natural fluids, such as for example oil, natural gas or other hydrocarbon-based extracted fluids |
| 12/27/2012 | WO2012174663A1 Fracturing port locator and isolation tool |
| 12/27/2012 | WO2012145488A3 System and method for deploying a downhole casing patch |
| 12/27/2012 | WO2012143775A3 Ball valve safety plug |
| 12/27/2012 | WO2012135292A3 Apparatus and method for completing wells using slurry containing a shape-memory material particles |
| 12/27/2012 | WO2012106031A3 Adjustable riser suspension and sealing system |
| 12/27/2012 | WO2011141687A3 Subterranean flow barriers containing tracers |
| 12/27/2012 | US20120325499 Liner top packer for liner drilling |
| 12/27/2012 | US20120325490 Method for blocking outflow of petroleum or the like due to damage to subsea petroleum well steel pipe or the like |
| 12/27/2012 | US20120325489 Apparatus and methods for use in establishing and/or maintaining controlled flow of hydrocarbons during subsea operations |