| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
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| 05/23/2012 | CN202228034U Wellhead device for pipeline to penetrate |
| 05/23/2012 | CN202228033U Adjustable umbrella-shaped overflow prevention pipe |
| 05/23/2012 | CN202228027U Anti-blowout anchoring tool under screw pump |
| 05/23/2012 | CN102466679A 一种超强吸水树脂堵漏能力的测试方法 A test method for plugging the ability of super absorbent resin |
| 05/23/2012 | CN102466678A 测试超强吸水树脂堵漏效果的新型方法 Testing super absorbent resin sealing effect of the new method |
| 05/23/2012 | CN102466677A 一种测试树脂粒径对超强吸水树脂堵漏效果影响的方法 A method for testing the effect of resin particle size effects on the super absorbent resin sealing |
| 05/23/2012 | CN102466591A 一种测试压力对超强吸水树脂堵漏能力影响的方法 A method of testing the pressure on the super-absorbent resin plugging Ability |
| 05/23/2012 | CN102465683A 多级封隔桥塞 Multistage packer bridge plugs |
| 05/23/2012 | CN102465682A 超强吸水树脂应用于裂缝堵漏的分段注入方法 Super absorbent resin injection method is applied to segment plugging cracks |
| 05/23/2012 | CN102465681A 一种超强吸水树脂的堵漏工艺 Plugging a super absorbent resin |
| 05/23/2012 | CN102465680A 超强吸水树脂的携带堵漏方法 Plugging carry super absorbent resin |
| 05/23/2012 | CN102465679A 抽油杆防喷装置 Sucker blowout preventer |
| 05/23/2012 | CN102465678A 双向防喷阀 Bidirectional blowout preventer valve |
| 05/23/2012 | CN102465677A 卡瓦夹紧式抽油杆防喷器 Kava clamping rod BOP |
| 05/23/2012 | CN101619652B Selective flow string |
| 05/23/2012 | CN101482001B Rubber plug system used for drilling liner cementing of horizontal well |
| 05/23/2012 | CN101435317B Loss return drop-out cross linked gel plugging process |
| 05/23/2012 | CN101418678B Striker structure for wellhead connector and method for making same |
| 05/23/2012 | CN101403291B Preset production fluid section plane test method of mechanical mining horizontal well and special shaft mouth test apparatus |
| 05/23/2012 | CN101403285B Physical foam cementing method |
| 05/22/2012 | US8181708 Water swelling rubber compound for use in reactive packers and other downhole tools |
| 05/22/2012 | US8181703 Method useful for controlling fluid loss in subterranean formations |
| 05/22/2012 | US8181702 Application of degradable fibers in invert emulsion fluids for fluid loss control |
| 05/22/2012 | US8181701 Downhole tool with hydraulic closure seat |
| 05/22/2012 | CA2676999C Silicate-based wellbore fluid and methods for stabilizing unconsolidated formations |
| 05/22/2012 | CA2659405C Closeable open cell foam for downhole use |
| 05/22/2012 | CA2638882C Packing element booster |
| 05/19/2012 | CA2756958A1 Emergency bowl for deploying control line from casing head |
| 05/18/2012 | WO2012064812A2 Emergency control system for subsea blowout preventer |
| 05/18/2012 | WO2012064582A1 Methods to enhance the productivity of a well |
| 05/18/2012 | CA2816695A1 Methods to enhance the productivity of a well |
| 05/17/2012 | US20120119445 Sealing devices having a non-elastomeric fibrous sealing material and methods of using same |
| 05/17/2012 | US20120118585 Dual metal seal system |
| 05/17/2012 | US20120118583 Plug and method of unplugging a seat |
| 05/17/2012 | US20120118581 Self sealing hydraulic coupler |
| 05/17/2012 | US20120118567 Method and Apparatus for Maintaining Pressure In Well Cementing During Curing |
| 05/17/2012 | US20120118561 Configurable inserts for downhole plugs |
| 05/17/2012 | US20120118559 Rcd sealing elements with multiple elastomer materials |
| 05/16/2012 | EP2452041A2 Methods for treating a wellbore |
| 05/16/2012 | EP2452040A2 A down hole well tool provided with a piston |
| 05/16/2012 | EP2220337B1 Logging tool deployment systems and methods with pressure compensation |
| 05/16/2012 | CN202220617U Drilling extraction hole plugging device |
| 05/16/2012 | CN202220616U Drilling extraction hole plugging device |
| 05/16/2012 | CN202220581U Plugging device of extraction drill hole |
| 05/16/2012 | CN202220580U Combined injection tool for external casing packer |
| 05/16/2012 | CN202220579U Single-layer central tube packer |
| 05/16/2012 | CN202220578U Polished rod blowout preventer for oil well |
| 05/16/2012 | CN202220577U Blowout-prevention deviation-prevention well mouth packing box |
| 05/16/2012 | CN202220576U Automatic compensation granule mixed packing lubrication type packing box |
| 05/16/2012 | CN202220572U Repeatedly activatable and recyclable bypass short joint |
| 05/16/2012 | CN202220458U Split heapstead of oil-gas well |
| 05/16/2012 | CN102459808A 用伸缩元件压裂和密封环形空间 Fracturing and sealed with a telescopic element annular space |
| 05/16/2012 | CN102459806A 用于石油和天然气井中的压裂操作的主动式外套管封隔器（ecp） For oil and gas wells fracturing operations active jacket packer (ecp) |
| 05/16/2012 | CN102454381A Oil-gas reservoir barefoot well cementing and completion method and device |
| 05/16/2012 | CN102454380A Device for automatically throwing ball into water hole of drilling tool |
| 05/16/2012 | CN102454379A Four-winged multifunctional ram blowout preventer |
| 05/16/2012 | CN102454378A Shear boost triggering and bottle reducing system and method |
| 05/16/2012 | CN102454377A Energizing ring nose profile and seal entrance |
| 05/16/2012 | CN102454376A Double-well ocean oil extraction wellhead device |
| 05/16/2012 | CN102454369A System for remediating a wellbore annulus |
| 05/16/2012 | CN102453475A Leak-stopping agent for petroleum drilling, preparation method, and application thereof |
| 05/16/2012 | CN102453471A Fresh water-based micro bubble drilling fluid for drilling coal bed gas |
| 05/15/2012 | US8176985 Well drilling and production using a surface blowout preventer |
| 05/15/2012 | CA2680346C Well tool with circumferential variations on packing element |
| 05/15/2012 | CA2674688C Wellhead assembly and method for an injection tubing string |
| 05/15/2012 | CA2634472C Downhole measurement system and method |
| 05/15/2012 | CA2626749C Diverter plugs for use in well bores and associated methods of use |
| 05/10/2012 | WO2012060909A1 Wellhead seal assembly lockdown system |
| 05/10/2012 | WO2012060711A1 Drilling device for use especially during directional drilling for recovery of geothermal energy |
| 05/10/2012 | WO2012059641A1 Method and apparatus for coupling an earth pipe into the ground, using a solidifying mass. |
| 05/10/2012 | WO2012059578A1 System and method for radially expanding a tubular element comprising an emergency blow-out preventer |
| 05/10/2012 | WO2012059574A1 System and method for radially expanding a tubular element |
| 05/10/2012 | US20120111632 Formation tester pad |
| 05/10/2012 | US20120111573 Gasket test protector sleeve for subsea mineral extraction equipment |
| 05/10/2012 | US20120111566 Apparatus and method for stimulating subterranean formations |
| 05/10/2012 | CA2816761A1 Method and apparatus for closure of an earth borehole |
| 05/09/2012 | CN202215278U Gas drainage drill hole plugging device |
| 05/09/2012 | CN202215222U Three-pipe thermal recovery wellhead of extremely-thicken oil horizontal well fireflood-assisted gravity drainage |
| 05/09/2012 | CN202215197U Horizontal well fast-drilling composite bridge plug |
| 05/09/2012 | CN202215196U Retrievable dust extrusion bridge plug component |
| 05/09/2012 | CN202215195U Steel wire delivery unidirectional jar-type obstruction device inside pipe |
| 05/09/2012 | CN202215194U Water adding packer |
| 05/09/2012 | CN202215193U Water-swelling self-sealing type packer |
| 05/09/2012 | CN202215192U High temperature high pressure open hole packer |
| 05/09/2012 | CN202215191U Chemical plugging tubular column for horizontal well |
| 05/09/2012 | CN202215190U Hole-sealing connecting rod for CO2 gas exploitation device |
| 05/09/2012 | CN202215189U Shearing and full-sealing double-gate-segment blowout preventer for oil field |
| 05/09/2012 | CN202215188U Adjustable locking device of blowout preventer |
| 05/09/2012 | CN202215187U Rod-type oil pump anti-spray device |
| 05/09/2012 | CN202215186U Device for pressure test of drilling/production integrated four-way workover blowout preventer |
| 05/09/2012 | CN202215185U Five-combination blowout preventer |
| 05/09/2012 | CN202215184U Protective device of underwater well head in sea |
| 05/09/2012 | CN202215183U U-shaped packing specially used for oil well |
| 05/09/2012 | CN202215182U Double-seal lubrication type self-sealing packer box |
| 05/09/2012 | CN202215181U Pilot production multifunctional integrated wellhead flow device |
| 05/09/2012 | CN202215180U Concentric tube wellhead assembly for thickened oil exploitation of steam-assisted gravity drainage |
| 05/09/2012 | CN202215172U Special tool for replacing seal packing of oil-transportation curved bar pump |
| 05/09/2012 | CN1910336B Device of a test plug |
| 05/09/2012 | CN102444392A Cement paste system choosing method capable of preventing oil, gas and water from channeling |
| 05/09/2012 | CN102444391A Portable well mouth sealer |