| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
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| 01/03/1995 | US5377757 Low temperature epoxy system for through tubing squeeze in profile modification, remedial cementing, and casing repair |
| 01/03/1995 | US5377754 Progressive fluid sampling for boreholes |
| 01/03/1995 | US5377753 Method and apparatus to improve the displacement of drilling fluid by cement slurries during primary and remedial cementing operations, to improve cement bond logs and to reduce or eliminate gas migration problems |
| 01/03/1995 | US5377750 Sand screen completion |
| 01/03/1995 | US5377749 Apparatus for setting hydraulic packers and for placing a gravel pack in a downhole oil and gas well |
| 01/03/1995 | US5377748 Spill container for wells with improved mounting |
| 01/03/1995 | US5377747 Environmentally safe wellhead |
| 12/27/1994 | US5375662 For applying hydraulic pressure to an operated well |
| 12/27/1994 | US5375661 Well completion method |
| 12/22/1994 | WO1994029572A1 Method and apparatus for communicating coded messages in a wellbore |
| 12/22/1994 | WO1994029570A1 Method and apparatus for oil or gas well cleaning |
| 12/22/1994 | WO1994029565A1 Multiple-seal underwater pipe-riser connector |
| 12/22/1994 | CA2142304A1 Method and apparatus for oil or gas well cleaning |
| 12/21/1994 | EP0629259A1 A method and a device for sealing between a casing and a drill hole in rock drilling operations. |
| 12/21/1994 | CN2185791Y Automatic core-regulating and direction-regulating polish rod sealer |
| 12/20/1994 | CA2126289A1 Method of abandoning a well and apparatus therefor |
| 12/14/1994 | CN2185319Y Electric compressed underground packer |
| 12/13/1994 | US5372202 Wellhead isolation tool and method of use |
| 12/13/1994 | US5372201 Annulus pressure actuated casing hanger running tool |
| 12/13/1994 | US5372200 Method and apparatus for sealing a wellbore or well casing screen |
| 12/13/1994 | US5372199 Subsea wellhead |
| 12/13/1994 | US5372198 Abandonment of sub-sea wells |
| 12/13/1994 | US5372194 Method of and means for operating geothermal wells |
| 12/08/1994 | WO1994028282A1 Remote control for a plug-dropping head |
| 12/08/1994 | DE4318736A1 Method and apparatus for taking gas and/or oil and/or water and/or solid samples during drilling operation |
| 12/07/1994 | EP0627545A2 Annular safety system for cased well |
| 12/07/1994 | EP0627544A2 Control module for subsea valve actuation |
| 12/06/1994 | US5370188 Borehole assembly, method and composition therefor |
| 12/06/1994 | US5370181 Anti gas-migration cementing |
| 11/30/1994 | CN2184083Y Dropping against device of wellhead for sealed well logging |
| 11/30/1994 | CN2184081Y Auto-sealing device under oil well |
| 11/30/1994 | CN1026811C Novel well finishing apparatus |
| 11/29/1994 | US5368335 Contingency tieback adapter |
| 11/29/1994 | US5368103 Method of setting a balanced cement plug in a borehole |
| 11/29/1994 | US5368098 Stage tool |
| 11/24/1994 | WO1994027026A1 Means in a downhole cement plug system |
| 11/24/1994 | WO1994021885A3 Sealing element |
| 11/24/1994 | DE4316973A1 Well pipe with partition walls |
| 11/23/1994 | CN2183447Y Intensive-type distributing device |
| 11/22/1994 | US5366020 Reinflatable external casting packer and method of casing |
| 11/22/1994 | US5366019 Horizontal inflatable tool |
| 11/22/1994 | US5366017 Intermediate casing annulus monitor |
| 11/22/1994 | US5366010 Retrievable bridge plug and a running tool therefor |
| 11/22/1994 | CA2057219C Packoff nipple |
| 11/17/1994 | EP0624799A2 Pressure probe for quantitative determination of contaminants in groundwater |
| 11/17/1994 | EP0624712A1 Submarine wellhead anchor |
| 11/16/1994 | CN2182876Y Conjunction head for two stage cementing |
| 11/16/1994 | CN2182875Y Device for sealing well with function of leading inner well with out side |
| 11/16/1994 | CN2182874Y Plug for sealing and used for several times |
| 11/16/1994 | CN2182873Y Sliding sleeve type device for seeking water and stoping water for oil pumping well |
| 11/15/1994 | US5365435 System and method for quantitative determination of mixing efficiency at oil or gas well |
| 11/15/1994 | US5364110 Downhole tool metal-to-metal seal |
| 11/15/1994 | US5363922 Device and method for installing a submerged water pump in an artesian well |
| 11/15/1994 | US5363542 Method of assembly for inflatable packer |
| 11/15/1994 | CA2036453C Non-crushing wellhead |
| 11/10/1994 | WO1994025726A1 Seal electrical conductor arrangement for use with a well bore in hazardous areas |
| 11/10/1994 | WO1994025725A1 Well plugging apparatus and method |
| 11/10/1994 | WO1994016192A3 Zone isolation apparatus |
| 11/10/1994 | CA2161779A1 A method for sealing off grounds sites |
| 11/09/1994 | EP0498878B1 Well tubing hanger sealing assembly |
| 11/09/1994 | CN2182262Y Temperature-control packer |
| 11/09/1994 | CN2182261Y Mud scraper for drill rod |
| 11/08/1994 | US5361840 Well plugging apparatus and method |
| 11/08/1994 | US5361837 Method for preventing annular fluid flow using tube waves |
| 11/08/1994 | US5361836 Straddle inflatable packer system |
| 11/08/1994 | US5361835 Cementing plug |
| 11/08/1994 | US5361832 Annular packer and insert |
| 11/08/1994 | US5361479 Method of assembly for inflatable packer |
| 11/08/1994 | CA2060160C Method of positioning tubing within a horizontal well |
| 11/02/1994 | EP0622522A2 Hydraulic port collar |
| 11/02/1994 | EP0622521A2 Combination packer/safety valve assembly for gas storage wells |
| 11/02/1994 | EP0622520A1 Annular sealing assembly |
| 11/01/1994 | US5360063 Wear bushing with locking collet |
| 11/01/1994 | US5360061 Blowout preventer with tubing shear rams |
| 10/27/1994 | WO1994024412A1 Reinflatable external casing packer and method of casing |
| 10/27/1994 | CA2119196A1 Annular sealing assembly |
| 10/26/1994 | EP0621247A2 Oil-wells cement slurries, their preparation and their use in well cementing operation |
| 10/26/1994 | EP0620892A1 Case cementing method and system |
| 10/26/1994 | CN2180778Y Discharger for oil pipe |
| 10/26/1994 | CN2180773Y Taking off tool for protective sleeve |
| 10/26/1994 | CN1026351C Prescription and technology for infrared radiation heater |
| 10/25/1994 | US5358054 Method and apparatus for controlling steam breakthrough in a well |
| 10/25/1994 | US5358048 For use in cementing operations in a well bore |
| 10/25/1994 | US5358047 Injecting to stimulate subterranean formation; includes a proppant material; hardening |
| 10/25/1994 | US5358044 Activator system; components of drilling fluid have dual functionality as promoters and thereafter in being constituents of cementitious slurry |
| 10/25/1994 | US5357999 Subsea control systems and apparatus |
| 10/25/1994 | CA2010326C Wellhead repair unit |
| 10/19/1994 | CN2179907Y Threaded connection casing joint |
| 10/18/1994 | US5355961 Metal and elastomer casing hanger seal |
| 10/18/1994 | US5355951 Method of evaluating oil or gas well fluid process |
| 10/18/1994 | CA2081395C Reinforcement structure for inflatable downhole packers |
| 10/13/1994 | WO1994023177A1 Method and apparatus for reducing pressure differential forces on a settable wellbore tool in a flowing well |
| 10/12/1994 | EP0619414A1 Method for cementing a pipe in a wellbore |
| 10/12/1994 | EP0428515B1 Electrical connectors |
| 10/12/1994 | CN2179458Y Rod blowout preventer of beam-pumping unit |
| 10/11/1994 | US5353876 Method and apparatus for sealing the juncture between a verticle well and one or more horizontal wells using mandrel means |
| 10/11/1994 | US5353871 Inflatable packer with protective rings |
| 10/11/1994 | US5353842 Inflatable plug for use in plugging a large diameter pipe |
| 10/11/1994 | CA2114918A1 Blowout preventer with removable packer |
| 10/05/1994 | EP0618345A1 Method and apparatus for cementing a casing string |