| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
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| 04/27/1994 | EP0593503A1 Blocking robot for high-pressure oil wells |
| 04/27/1994 | CN2163230Y Dual-function sword-like back-pressure valve |
| 04/26/1994 | US5306750 Polymer containing epoxy compound; storage stability; road paving, roofing |
| 04/26/1994 | US5305839 Turbine pump ring for drilling heads |
| 04/26/1994 | US5305831 Wellbore cementing process |
| 04/26/1994 | US5305828 Combination packer/safety valve assembly for gas storage wells |
| 04/23/1994 | CA2091493A1 Rotating head with elastomeric member rotating assembly |
| 04/21/1994 | DE4235378A1 Method for erosion injection into soils etc - uses continuous process to cut open and mill out soil, and inject binding agent suspension continuously into hole |
| 04/20/1994 | EP0593280A1 Blowout preventer with tubing shear rams |
| 04/20/1994 | EP0593218A2 Variable bore packer for a ram-type blowout preventer |
| 04/20/1994 | EP0593122A2 Blow-out prevention device for shutting off an annulus between a drill column and a well wall |
| 04/20/1994 | EP0592739A1 Load support ring |
| 04/19/1994 | US5303776 Device for a down-hole assembly |
| 04/19/1994 | US5303774 Ring seal packer |
| 04/17/1994 | CA2108487A1 Blow-out prevention device for shutting off an annulus between a drill column and a well wall when drilling for oil or gas |
| 04/17/1994 | CA2106109A1 Load support ring |
| 04/15/1994 | CA2106920A1 Blowout preventer with tubing shear rams |
| 04/14/1994 | WO1994008126A1 Method for cement placement in horizontal wells |
| 04/14/1994 | DE4329269A1 Method of sinking ground probe in pipe-lined borehole - involves filling outer annular space between borehole wall and lining pipe with sealant of good thermal conductivity and hose is extended by liq. static pressure or by steam |
| 04/14/1994 | CA2144846A1 Means for improving cement placement in horizontal wells |
| 04/14/1994 | CA2107739A1 Variable bore packer for a ram-type blowout preventer |
| 04/13/1994 | CN1024200C Use of mangano-manganic oxide in drilling mud and oil well cement slurries |
| 04/12/1994 | US5302052 Underground work chamber assembly and method for the construction thereof |
| 04/12/1994 | US5301760 Completing horizontal drain holes from a vertical well |
| 04/12/1994 | US5301752 Drilling and cementing with phosphate-blast furnace slag |
| 04/12/1994 | US5301751 Method for using soap as a soluable fluid loss additive in the hydraulic fracturing treatment of oil and gas wells |
| 04/12/1994 | US5301750 Wellhead apparatus |
| 04/12/1994 | CA1328399C Process and means for measuring geological formations properties in a horizontal borehole drilled from an underground patch |
| 04/06/1994 | CN2160751Y Controller for high return flushing of well reinforcing cement paste |
| 04/06/1994 | CN2160750Y Packer for oil well |
| 04/06/1994 | CN2160749Y V shaped elastic sealing device |
| 04/05/1994 | US5299644 Well starter head |
| 04/05/1994 | US5299643 Dual radially locked subsea housing |
| 04/05/1994 | US5299642 Subsea wellhead tieback connector |
| 04/05/1994 | US5299641 Christmas tree for subsea production |
| 04/05/1994 | US5299640 Knife gate valve stage cementer |
| 04/05/1994 | US5299638 Process for transporting particles in a porous medium |
| 04/05/1994 | CA2030206C Seal structure for elevated temperature service |
| 04/05/1994 | CA2021518C Liner isolation and well completion system |
| 03/31/1994 | WO1994007147A1 Single bore hole process and device allowing simultaneous videotechnical detection of groundwater direction and speed of flow |
| 03/30/1994 | EP0589687A2 Coiled tubing inflatable packer |
| 03/30/1994 | EP0589586A2 Isolation washpipe for earth well completions and method for use in gravel packing a well |
| 03/30/1994 | CN1024101C Method and apparatus for fire extinguishing and gush-stopping of oil/gas well |
| 03/29/1994 | US5298069 Acid removable low density well cement compositions and methods |
| 03/29/1994 | US5297805 Sealing ring |
| 03/29/1994 | US5297634 Method and apparatus for reducing wellbore-fluid pressure differential forces on a settable wellbore tool in a flowing well |
| 03/29/1994 | US5297633 For use in an enclosure |
| 03/29/1994 | US5297629 Drill stem testing with tubing conveyed perforation |
| 03/29/1994 | CA2105008A1 Casing hanger seal with test port |
| 03/29/1994 | CA2022195C Hydraulically operated permanent type well packer assembly |
| 03/26/1994 | CA2090732A1 Retrievable packer |
| 03/23/1994 | EP0424452B1 Plug for well logging operations |
| 03/22/1994 | US5295848 Releasable hydraulic and/or electric connection for subsea equipment |
| 03/22/1994 | US5295547 Multiplexed electrohydraulic type of control system for use in undersea production system |
| 03/22/1994 | US5295541 Casing repair using a plastic resin |
| 03/22/1994 | US5295538 Sintered screen completion |
| 03/22/1994 | US5295535 For detecting leakage from an underground storage tank |
| 03/22/1994 | US5295393 Fracturing method and apparatus |
| 03/17/1994 | WO1994005897A1 Injection of mixtures into subterranean formations |
| 03/17/1994 | WO1994005892A1 Template and process for drilling and completing multiple wells |
| 03/17/1994 | DE4230919A1 Einzel-Bohrloch-Verfahren und -Vorrichtung zur gleichzeitigen Ermittlung der Grundwasser-Strömungsrichtung und -geschwindigkeit Single-hole method and apparatus for the simultaneous determination of the groundwater flow direction and velocity |
| 03/15/1994 | US5294088 Variable bore packer for a ram-type blowout preventer |
| 03/15/1994 | US5293934 Ground water sampling unit having a fluid-operated seal |
| 03/15/1994 | US5293933 Swivel cementing head with manifold assembly having remote control valves and plug release plungers |
| 03/09/1994 | CN2158446Y Sleeve string packing for gas well |
| 03/09/1994 | CN2158445Y 简易套管头 Simple casing head |
| 03/09/1994 | CN1083563A Stabilizing compositions and methods for stabilizing subterranean formations |
| 03/08/1994 | US5291947 Tubing conveyed wellbore straddle packer system |
| 03/03/1994 | WO1994004790A1 Protective arrangements for downhole tools |
| 03/02/1994 | EP0585097A2 Mechanical cementing packer collar |
| 03/02/1994 | EP0436706B1 Apparatus for recovering a wellhead |
| 03/02/1994 | CN2157980Y Water injection plug |
| 03/01/1994 | US5290126 Antirotation device for subsea wellheads |
| 03/01/1994 | US5289884 Well pumping |
| 03/01/1994 | US5289883 Method of reducing pressure of subterranean gas rising within a well casing |
| 03/01/1994 | US5289882 Sealed electrical conductor method and arrangement for use with a well bore in hazardous areas |
| 03/01/1994 | US5289877 Cement mixing and pumping system and method for oil/gas well |
| 03/01/1994 | US5289876 Completing wells in incompetent formations |
| 02/28/1994 | CA2077028A1 Oil/gas separator for installation at burning wells |
| 02/23/1994 | EP0583977A2 Cementing systems for oil wells |
| 02/23/1994 | EP0583913A1 Equipment for the interconnection of two lines to allow running of pigs |
| 02/23/1994 | EP0583912A1 Equipment for the interconnection of two lines to allow running of pigs |
| 02/22/1994 | US5287925 Wellhead apparatus |
| 02/22/1994 | US5287922 Emergency method for running slips over casing collars |
| 02/22/1994 | US5287879 Hydraulically energized wireline blowout preventer |
| 02/17/1994 | WO1994003705A1 Sintered screen completion |
| 02/17/1994 | WO1994003704A1 Gravel packing system |
| 02/17/1994 | WO1994003702A1 Method and apparatus for sealing the juncture between a vertical and horizontal well |
| 02/17/1994 | WO1994003699A1 Method and apparatus for sealing the juncture between a vertical well and one or more horizontal wells |
| 02/16/1994 | EP0583121A1 Angular and radial self-aligning coupling |
| 02/16/1994 | CN2156283Y Positioning flow limited press crack sealing and insulator |
| 02/16/1994 | CN2156282Y Theft-proof simple well lid |
| 02/16/1994 | CN2156281Y Well sealing device for oil suction machine with rod |
| 02/16/1994 | CN2156279Y Smooth sealing device for oil pump |
| 02/15/1994 | US5285853 Casing hanger seal with test port |
| 02/15/1994 | US5285852 Wellhead isolation tool and method of use thereof |
| 02/15/1994 | US5285849 Formation treating methods |
| 02/15/1994 | US5285706 Pipe threading apparatus |
| 02/11/1994 | CA2101561A1 Angular and radial self-aligning coupling |
| 02/09/1994 | EP0582367A1 Retarded acid soluble well cement compositions |