| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
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| 07/23/2008 | CN201090209Y Hoisting type rotary control head |
| 07/23/2008 | CN201090205Y Centralized monitoring baffling and kill-job device |
| 07/23/2008 | CN201090175Y Seal device for injecting-enveloping cement outside tube |
| 07/23/2008 | CN201090174Y Steel body sealing float collar and float shoe for oil field well-cementing |
| 07/23/2008 | CN201090173Y Telescopic heat-sensitive packer |
| 07/23/2008 | CN201090172Y Well head connecting type sucker rod, oil tube environmental protection cleaner |
| 07/23/2008 | CN201090171Y Ring high-spring high-pressure abrasion-proof glue core |
| 07/23/2008 | CN201090170Y Ball type blowout preventer capable of cooling water |
| 07/23/2008 | CN201090169Y Well head anchorage blowout preventer |
| 07/23/2008 | CN201090168Y Multifunctional sucker rod sealer |
| 07/23/2008 | CN201090167Y Anti-dropping oil well pipe anti-spraying jam |
| 07/23/2008 | CN201090155Y Oil-pumping polish-rod discus-base special-purpose taking-loading machine |
| 07/23/2008 | CN100404457C Flexible cementing compositions and methods for high-temperature wells |
| 07/22/2008 | US7401788 High pressure and temperature seal for downhole use |
| 07/22/2008 | US7401654 Blowout preventer testing system |
| 07/22/2008 | US7401646 Methods for reverse-circulation cementing in subterranean formations |
| 07/22/2008 | US7401645 Downhole fluid disposal apparatus and methods |
| 07/22/2008 | CA2561655C Subsurface lubricator and method of use |
| 07/22/2008 | CA2561654C Subsurface lubricator and method of use |
| 07/22/2008 | CA2511826C Alternative packer setting method |
| 07/22/2008 | CA2506458C Recoverable, reinforced and vibration-damping plug used for cased wells |
| 07/22/2008 | CA2495524C Apparatus and method for installation of subsea well completion systems |
| 07/22/2008 | CA2493518C System and method for sensing load on a downhole tool |
| 07/22/2008 | CA2474418C Tubing string rotator |
| 07/22/2008 | CA2468895C Downhole tool retention apparatus |
| 07/22/2008 | CA2431373C Snap-lock seal for seal valve assembly |
| 07/22/2008 | CA2380286C Mechanism for dropping a plurality of balls into tubulars used in drilling, completion and workover of oil, gas and geothermal wells, and method of using same |
| 07/22/2008 | CA2355555C Well tubing rotator and hanger system |
| 07/22/2008 | CA2281278C Method for filling voids with aggregate material |
| 07/17/2008 | WO2008085670A2 Method of isolating and completing multi-zone frac packs |
| 07/17/2008 | WO2008085057A1 Dual directional downhole overpressure valve |
| 07/17/2008 | WO2008084162A2 Controllably-deformable inflatable sleeve, production method thereof and use of same for pressure metering applications |
| 07/17/2008 | US20080169108 Multiple dart drop circulating tool |
| 07/17/2008 | US20080169101 Method of using humic acid grafted fluid loss control additives in cementing operations |
| 07/17/2008 | US20080169100 Methods of servicing a wellbore with compositions comprising quaternary material and sorel cements |
| 07/17/2008 | US20080169099 Method for Controlling the Flow of Fluid Between a Downhole Formation and a Base Pipe |
| 07/16/2008 | EP1623089B1 Self adaptive cement systems |
| 07/16/2008 | EP1497528B1 Split carrier annulus seal assembly for wellhead systems |
| 07/16/2008 | CN201087725Y Packer |
| 07/16/2008 | CN201087724Y Multifunctional packer |
| 07/16/2008 | CN201087723Y Small-borehole barefoot well packer |
| 07/16/2008 | CN201087722Y Barefoot well packer |
| 07/16/2008 | CN201087721Y Packer |
| 07/16/2008 | CN201087720Y Control device of ground blowout preventer |
| 07/16/2008 | CN201087719Y Novel double ram thick oil blowout preventer |
| 07/16/2008 | CN201087718Y Novel double ram blowout preventer |
| 07/16/2008 | CN201087717Y Integral high-pressure oil water well operation device under pressure |
| 07/16/2008 | CN201087716Y Top-fixed slip expansion joint type operation device under pressure |
| 07/16/2008 | CN201087715Y Double C shaped metal sealing device |
| 07/16/2008 | CN201087714Y Double-oil tube well mouth device |
| 07/16/2008 | CN201087713Y Injection-production integrated double tube thermal production well mouth device |
| 07/16/2008 | CN201087708Y Mounting tools for incontrollable well blowout spraying device |
| 07/15/2008 | US7398832 Mono-diameter wellbore casing |
| 07/15/2008 | US7398830 Electric-hydraulic power unit |
| 07/15/2008 | US7398828 Well cementing slurries containing fibers |
| 07/15/2008 | US7398827 Methods for high temperature lightweight cementing |
| 07/15/2008 | US7398825 Methods of controlling sand and water production in subterranean zones |
| 07/15/2008 | CA2545701C Solid rubber packer for a rotating control device |
| 07/15/2008 | CA2545371C Plug systems and methods for using plugs in subterranean formations |
| 07/15/2008 | CA2456505C Single-direction cementing plug |
| 07/15/2008 | CA2450561C Method of expanding a sand screen |
| 07/15/2008 | CA2408975C Device for sealing a bore hole and discharging drill cuttings and stripped excavation material |
| 07/15/2008 | CA2381212C Anti-rotation device for use with well tools |
| 07/13/2008 | WO2008077499A1 Method to cure lost circulation |
| 07/13/2008 | CA2673860A1 Method to cure lost circulation |
| 07/10/2008 | WO2008082971A1 Liner anchor for expandable casing strings |
| 07/10/2008 | WO2008082970A1 Non-backed-up packing element system |
| 07/10/2008 | WO2008082307A1 Pressure driven apparatus for sequential control of a cementing head |
| 07/10/2008 | WO2008081169A1 Ball operated back pressure valve |
| 07/10/2008 | WO2008081168A1 Wiper darts for subterranean operations |
| 07/10/2008 | WO2008039727A3 Method for wellbore servicing to enhance the mechanical strength of cement using electrochemically activated water |
| 07/10/2008 | US20080164431 Dual-Cylinder Blowout Preventer Operator System |
| 07/10/2008 | US20080164031 Wiper Darts for Subterranean Operations |
| 07/10/2008 | US20080164029 Apparatus and method for forming multiple plugs in a wellbore |
| 07/10/2008 | US20080164028 Ball Operated Back Pressure Valve |
| 07/10/2008 | CA2667344A1 Non-backed-up packing element system |
| 07/09/2008 | EP1941188A2 A seal for use with pipe and flange assemblies |
| 07/09/2008 | CN201083107Y Water well subdivision packer |
| 07/09/2008 | CN201083106Y Balanced type cascade unsealing washable well packer |
| 07/09/2008 | CN201083105Y Well head plunger reciprocating machinery dynamic sealing device |
| 07/09/2008 | CN201083104Y Well head sealing packing |
| 07/09/2008 | CN201083103Y Protection lathe dog head for oil water well |
| 07/09/2008 | CN201083102Y Environment-friendly type multi-efficiency packing box |
| 07/09/2008 | CN201083101Y Integrated dual-purpose tool |
| 07/09/2008 | CN201083097Y Folding oil well packing fast changing device |
| 07/09/2008 | CN101215960A Light well head device for single well production |
| 07/09/2008 | CN100400792C Shoe for expandable liner system |
| 07/08/2008 | US7395867 Hybrid wellhead system and method of use |
| 07/08/2008 | US7395866 Method and apparatus for blow-out prevention in subsea drilling/completion systems |
| 07/08/2008 | US7395865 Gas lift plunger arrangement |
| 07/08/2008 | US7395861 Placing the cement containing water, a hydraulic cement, and an a chlorinated carbohydrate in a subterranean formation; allowing to set; retard the setting time of the cement without delaying compressive strength development |
| 07/08/2008 | US7395860 Methods of using foamed settable compositions comprising cement kiln dust |
| 07/08/2008 | US7395858 Process for the selective controlled reduction of the relative water permeability in high permeability oil-bearing subterranean formations |
| 07/08/2008 | US7395856 Disappearing plug |
| 07/08/2008 | CA2526034C Reverse circulation cementing process |
| 07/08/2008 | CA2517801C Rotating stuffing box with split standpipe |
| 07/08/2008 | CA2471336C Expandable borehole liner |
| 07/08/2008 | CA2467863C Downhole sampling apparatus and method |
| 07/08/2008 | CA2410574C Pipe handling apparatus and method of landing items at a well location |
| 07/08/2008 | CA2400001C Intervention device for a subsea well, and method and cable for use with the device |