| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
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| 08/20/1991 | US5040603 Sequential remote control plug release system |
| 08/20/1991 | US5040602 Inner string cementing adapter and method of use |
| 08/20/1991 | US5040600 Geothermal wellhead repair unit |
| 08/20/1991 | US5040283 Method for placing a body of shape memory metal within a tube |
| 08/20/1991 | CA1287786C Coupling and seal assembly |
| 08/14/1991 | EP0441021A1 Packer locking apparatus |
| 08/14/1991 | CN1013506B Method for placing body of shape memory metal within tubing |
| 08/13/1991 | US5039140 Wellhead joint and sealing ring |
| 08/13/1991 | US5038865 Method of and apparatus for protecting downhole equipment |
| 08/13/1991 | US5038862 External sleeve cementing tool |
| 08/07/1991 | EP0440487A2 Plug apparatus and method for cementing a liner in a well bore |
| 08/07/1991 | EP0439896A1 Variable bore packer for a ram type blowout preventer |
| 08/07/1991 | EP0439484A1 Float collar and plug for use in wells |
| 08/07/1991 | CN1053631A Temperarily blocking agent for water soluble stratum |
| 08/06/1991 | USRE33656 Downhole cementing tool assembly |
| 08/06/1991 | US5036922 Single plug arrangement, lock therefor and method of use |
| 08/05/1991 | CA2009284A1 Liner and drill pipe assembly |
| 08/01/1991 | CA2035289A1 Plug apparatus and method for cementing a liner in a well bore |
| 07/31/1991 | WO1991011624A1 Actuator with automatic lock |
| 07/31/1991 | EP0438455A1 Arrangement for protecting components in subsea systems. |
| 07/31/1991 | EP0438454A1 Coupling arrangement for components in subsea structures and a remotely operated tool unit for handling such components |
| 07/31/1991 | CN1053468A Underground back filling and grouting materials |
| 07/31/1991 | CA2074832A1 Actuator with automatic lock |
| 07/30/1991 | WO1991011587A1 Method and apparatus for sealing pipe perforations |
| 07/30/1991 | US5035813 Containing water, lime, glycerol,sugar and silica flour as weighing agent;drilling of geothermal brine wells |
| 07/30/1991 | US5035286 Methods and apparatus for field blasting of earth formations using inflatable devices for suspending explosives in boreholes |
| 07/30/1991 | CA2049974A1 Method and apparatus for sealing pipe perforations |
| 07/30/1991 | CA1287160C Method and device for the installation of seismic sensors in a producer oil well |
| 07/30/1991 | CA1286983C Restriction subs for setting cement plugs in wells |
| 07/24/1991 | EP0437895A1 Method for building foundation piles of concrete |
| 07/24/1991 | CN1053280A Apparatus for covering complex section in well |
| 07/24/1991 | CN1053278A Well casing flotation device and method |
| 07/23/1991 | US5033551 Well packer and method |
| 07/23/1991 | CA1286602C Tubing resettable well packer |
| 07/17/1991 | CA2033806A1 Tubular footing form for building foundation piles of concrete |
| 07/16/1991 | US5032042 Method and apparatus for eliminating non-naturally occurring subsurface, liquid toxic contaminants from soil |
| 07/16/1991 | US5031699 Method of casing off a producing formation in a well |
| 07/16/1991 | US5031696 Casing hanger and seal |
| 07/16/1991 | US5031695 Well casing hanger with wide temperature range seal |
| 07/10/1991 | CN2080556U Tool for taking bridge plug in or out of well |
| 07/10/1991 | CN1013134B Process for the enhanced oil recovery of underground mineral oil deposits |
| 07/10/1991 | CN1013132B Post grouting process for water bearing sand strata behind the wall |
| 07/09/1991 | US5029647 Subsea wellhead stabilization |
| 07/09/1991 | US5029643 Drill pipe bridge plug |
| 07/09/1991 | CA1285864C Wellhead tubing and casing packer and installation and removal tool |
| 07/03/1991 | EP0435430A1 Method of and apparatus for protecting downhole equipment |
| 07/02/1991 | US5028079 Non-crushing wellhead |
| 07/02/1991 | US5027903 Coiled tubing velocity string hangoff method and apparatus |
| 07/02/1991 | US5027900 Incremental density cementing spacers |
| 07/02/1991 | US5027895 Expandable packer apparatus |
| 07/02/1991 | US5027894 Through the tubing bridge plug |
| 07/02/1991 | CA1285472C Method and system for maintenance and servicing of subsea wells |
| 06/30/1991 | WO1991009907A1 Polymer and asphalt reaction process and polymer-linked-asphalt product |
| 06/30/1991 | CA2072579A1 Polymer and asphalt reaction process and polymer-linked-asphalt product |
| 06/30/1991 | CA2027967A1 Method of and apparatus for protecting downhole equipment |
| 06/27/1991 | WO1991009204A1 Seal structure for elevated temperature service |
| 06/26/1991 | EP0434544A1 Process and composition for the selective reduction of the water permeability in warm and salt hydrocarbon reservoirs |
| 06/25/1991 | US5026219 Portable wellhead and welder protector system |
| 06/25/1991 | US5026200 Releasable connector |
| 06/25/1991 | US5026097 Wellhead apparatus |
| 06/25/1991 | US5026074 Annular metal-to-metal seal |
| 06/25/1991 | US5025864 Casing hanger wear bushing |
| 06/25/1991 | US5025858 Well apparatuses and anti-rotation device for well apparatuses |
| 06/25/1991 | US5025857 Wellhead tubing and casing packer and installation and removal tool |
| 06/25/1991 | US5025708 Actuator with automatic lock |
| 06/25/1991 | CA1285218C Pressure energized/pressure intensified casing seal |
| 06/25/1991 | CA1285217C Wellhead with eccentric casing seal ring |
| 06/20/1991 | DE4036721A1 Drilling or driving holes in cave walls or floors - involves use of drill rod and head inside associated tube and sealing free end |
| 06/19/1991 | CN2079216U Well eruption-proof box |
| 06/19/1991 | CN1052351A Stratum blocking agent with polyurethane foam |
| 06/19/1991 | CN1052350A Method for blocking water well or oil well high premeating layer by composite high polymer |
| 06/18/1991 | US5024453 Liveload assembly for rotary or reciprocating shaft packing |
| 06/18/1991 | US5024273 Cementing apparatus and method |
| 06/13/1991 | WO1991008376A1 Method for plugging well walls |
| 06/13/1991 | WO1991008271A1 Improved process for stabilising rock and/or filling hollows, e.g. in tunnel building and mining |
| 06/12/1991 | EP0431689A1 Packer and service tool assembly |
| 06/12/1991 | EP0431507A2 Apparatus and method for cleaning filtering gravel packs in water wells |
| 06/12/1991 | CN2078793U Thermal expansion packer |
| 06/12/1991 | CN2078792U Blow-out preventer for suction well head of oil well |
| 06/12/1991 | CN2078791U Protective device of polish rod seal stuffing for pumping well |
| 06/12/1991 | CN1052166A Wash tool |
| 06/12/1991 | CA2031168A1 Valving system for inflatable packers |
| 06/11/1991 | US5022472 Hydraulic clamp for rotary drilling head |
| 06/06/1991 | DE3940088A1 Verbessertes verfahren zur gesteinsverfestigung und/oder hohlraumverfuellung zb im tunnel- und bergbau Improved methods for rock solidification and / or hohlraumverfuellung eg tunnels and mining |
| 06/05/1991 | EP0430523A2 Cementing head and swivel well tool |
| 06/05/1991 | EP0430389A1 Gravel packing assembly |
| 06/05/1991 | CN1051958A Casing valve |
| 06/05/1991 | CN1051957A Leakage blocking agent of well drilling |
| 06/04/1991 | US5020600 Method and apparatus for chemical treatment of subterranean well bores |
| 06/04/1991 | US5020597 Arrangement and method for conducting substance and lock therefor |
| 06/04/1991 | US5020594 Method to prevent gas intrusion into wellbores during setting of cements |
| 06/04/1991 | US5020593 Latch ring for connecting tubular members |
| 06/04/1991 | US5020592 Tool for treating subterranean wells |
| 06/04/1991 | US5020590 Back pressure plug tool |
| 06/04/1991 | CA1284619C Production tieback connector |
| 06/04/1991 | CA1284618C Blowout controller |
| 06/02/1991 | CA2029594A1 Lift-through head and swivel |
| 06/01/1991 | CA2004393A1 Method of cementing well casing to avoid gas channelling from shallow gas-bearing formations |
| 05/30/1991 | WO1991007569A1 Method for finishing a well |
| 05/30/1991 | WO1991007568A1 Method for finishing a well |