| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
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| 03/16/1997 | CA2185048A1 Elevated electrical connector assembly |
| 03/13/1997 | WO1997009512A1 Expandable retrievable bridge plug |
| 03/13/1997 | CA2231227A1 Expandable retrievable bridge plug |
| 03/12/1997 | EP0760942A1 Apparatus for testing a shear thickening plugging fluid |
| 03/12/1997 | EP0760898A1 Double walled insulated tubing and method of installing same |
| 03/12/1997 | EP0760897A1 Injector for injecting a tracer into an oil or gas reservoir |
| 03/12/1997 | EP0760896A1 A well entry tool |
| 03/12/1997 | EP0667930B1 Drilling and cementing a well |
| 03/12/1997 | CA2185067A1 Production wells having permanent downhole formation evaluation sensors |
| 03/11/1997 | CA2022144C Geothermal well chemical injection system |
| 03/05/1997 | EP0701651B1 Multiple-seal underwater pipe-riser connector |
| 03/05/1997 | EP0604568B1 Downhole activated system for perforating a wellbore |
| 03/04/1997 | US5607019 Adjustable mandrel hanger for a jackup drilling rig |
| 03/04/1997 | US5607017 Dissolvable well plug |
| 03/04/1997 | CA2148574C Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms |
| 02/26/1997 | CN2248243Y Stage-cementing equipment for oil-gas well |
| 02/25/1997 | US5605195 Inflation shape control system for inflatable packers |
| 02/25/1997 | US5605194 Independent screwed wellhead with high pressure capability and method |
| 02/25/1997 | CA2101815C Equipment for the interconnection of two lines to allow running of pigs |
| 02/24/1997 | CA2156779A1 Dormant borehole sealing device |
| 02/20/1997 | WO1997006347A1 Above production disposal tool |
| 02/20/1997 | WO1997006346A1 Inflatable tubular sleeve for tubing or obturating a well or a pipe |
| 02/20/1997 | WO1997006344A1 Downhole apparatus |
| 02/20/1997 | WO1997006343A1 Self-aligning stuffing box for pumpjack units |
| 02/20/1997 | WO1997005759A2 Improved downhole apparatus |
| 02/20/1997 | WO1996038649A3 Activating means for a down-hole tool |
| 02/20/1997 | CA2228840A1 Downhole apparatus |
| 02/19/1997 | CN2247719Y Christmas tree |
| 02/18/1997 | US5603511 Expandable seal assembly with anti-extrusion backup |
| 02/18/1997 | US5603481 Front packer for ram-type blowout preventer |
| 02/13/1997 | WO1997005361A1 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing |
| 02/13/1997 | WO1997005360A1 Apparatus and process for drilling and completing multiple wells |
| 02/12/1997 | CN2247230Y Double-stage cement filling tool |
| 02/12/1997 | CN1142786A Solvent soaps and methods employing same |
| 02/06/1997 | WO1997004211A1 Lightweight intervention system |
| 02/06/1997 | WO1997004210A1 Lightweight intervention system for use with horizontal tree with internal ball valve |
| 02/05/1997 | EP0397870B1 Method of casing the production seam in a well |
| 02/05/1997 | EP0353309B1 Method of constructing a well |
| 02/05/1997 | CN2246707Y Bell mouth flushing device for cementing liner hanger |
| 02/05/1997 | CN2246706Y Hydraulic automatic locking device for ram of blow-out preventer |
| 02/04/1997 | US5598890 Completion assembly |
| 01/30/1997 | WO1997003311A1 Multigate dual position valve |
| 01/29/1997 | CN2246191Y Multifunctional well cementation cement filling appts. |
| 01/29/1997 | CN2246190Y Adjustable oil extraction well appts. |
| 01/29/1997 | CN1141661A Method for sub-surface fluid shut-off |
| 01/28/1997 | US5597505 Hole form apparatus |
| 01/28/1997 | US5597043 Method of completing wellbores to control fracturing screenout caused by multiple near-wellbore fractures |
| 01/28/1997 | US5597042 Method for controlling production wells having permanent downhole formation evaluation sensors |
| 01/28/1997 | US5597041 Well head cutting and capping system |
| 01/23/1997 | WO1996034175A3 Cementing plug |
| 01/22/1997 | CN2245660Y Underground anti-injection and anti-leakage sealing apparatus for drilling |
| 01/21/1997 | US5595247 Retrievable through tubing tool and method |
| 01/21/1997 | US5595246 One trip cement and gravel pack system |
| 01/21/1997 | CA2141510C Tubing string hanging apparatus |
| 01/21/1997 | CA2087866C Drill stem testing with tubing conveyed perforation |
| 01/16/1997 | WO1996028633A3 Universal pipe injection apparatus for wells and method |
| 01/15/1997 | EP0753648A2 Packer type groundwater sampling system and water sampling method |
| 01/15/1997 | EP0753647A2 Down hole testing apparatus with television |
| 01/15/1997 | EP0489142B1 Subsea pump system |
| 01/15/1997 | CN2245114Y Sealer for well head |
| 01/14/1997 | CA2181117A1 Well completion device |
| 01/11/1997 | CA2153524A1 Wellbore sand control method |
| 01/09/1997 | WO1997001017A1 Insulated and/or concentric coiled tubing |
| 01/09/1997 | DE3791059C2 Cementing arrangement in well bore |
| 01/08/1997 | EP0690942B1 Process for sealing off ground sites and device for carrying out this process |
| 01/07/1997 | US5590867 Blowout preventer for coiled tubing |
| 01/07/1997 | US5590715 Underground heat exchange system |
| 01/07/1997 | US5590713 Remote control for well tool |
| 01/01/1997 | CN2244094Y Turbine automatic grout machine |
| 01/01/1997 | CN2244093Y Wellhead plugging device for natural gas well |
| 01/01/1997 | CN2244092Y Anti-theft well head device of oil pumping machine |
| 12/31/1996 | US5588491 Rotating blowout preventer and method |
| 12/31/1996 | US5588489 Cementing zone in well using composition containing slag cement, water to form pumpable slurry, gas to foam slurry, foaming agent |
| 12/31/1996 | US5588488 Cementing multi-lateral wells |
| 12/31/1996 | US5588487 Within a well bore |
| 12/31/1996 | CA2093186C Squeeze cementing |
| 12/27/1996 | EP0750096A1 A method for injecting back-filling material into a space between the outside of double-wall pipes and the ground in the pipe-jacking method |
| 12/27/1996 | EP0749516A1 Multi-operational expansion gasket |
| 12/25/1996 | CN2243529Y Anti-stealing packing box |
| 12/24/1996 | US5586601 Mechanism for anchoring well tool |
| 12/19/1996 | WO1996041091A1 Primary and secondary seal assemblies with contacting convex surfaces |
| 12/17/1996 | US5585593 Inert stemming materials |
| 12/17/1996 | US5584489 Primary and secondary seal assemblies with contacting convex surfaces |
| 12/17/1996 | US5584488 Seal |
| 12/17/1996 | US5584343 Method and apparatus for filling and circulating fluid in a wellbore during casing running operations |
| 12/16/1996 | CA2151906A1 Well completion tool and process |
| 12/11/1996 | EP0746664A1 Whipstock apparatus and methods of use |
| 12/11/1996 | CN2242332Y Fluorine plastic packing for oil water well |
| 12/10/1996 | US5582438 Lateral connector for tube assembly |
| 12/10/1996 | US5582253 Debris barrier with a downhole tool setting assembly |
| 12/07/1996 | CA2173912A1 Shock absorber and wiper |
| 12/05/1996 | WO1996038650A1 A simplified sealing and anchoring device for a well tool |
| 12/05/1996 | WO1996038649A2 Activating means for a down-hole tool |
| 12/03/1996 | US5579841 Plugs for well logging operations |
| 12/03/1996 | US5579839 Bulge control compression packer |
| 12/03/1996 | US5579838 Above production disposal tool |
| 12/03/1996 | CA2177947A1 Coiled tubing apparatus |
| 12/03/1996 | CA2177925A1 Debris barrier with a downhole tool setting assembly |
| 12/03/1996 | CA2148169C Temporary plug system |
| 11/28/1996 | WO1996037682A1 Method and apparatus for sealing and transferring force in a wellbore |