| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
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| 02/08/1994 | US5284210 Top entry sub arrangement |
| 02/08/1994 | US5284207 Method of cleaning a well bore prior to a cementing operation |
| 02/02/1994 | EP0581533A2 Stage cementer and inflation packer apparatus |
| 02/01/1994 | CA2101492A1 Stage cementer and inflation packer apparatus |
| 02/01/1994 | CA2094897A1 Retarded acid soluble well cement compositions and methods |
| 02/01/1994 | CA1326630C Deployment/retrieval method and apparatus for well logging tools used with coiled tubing |
| 01/31/1994 | WO1993003254A1 Improved sub-sea test tree apparatus |
| 01/26/1994 | EP0579878A1 A wellhead connector |
| 01/26/1994 | CN2154344Y Human pit bottom for fixing oil well |
| 01/25/1994 | US5281270 Water slurry of magnesium oxide and magnesium chloride and borate and sugar set retarder |
| 01/25/1994 | US5280824 Sealing element for inflatable packer |
| 01/25/1994 | US5280823 Apparatus for regaining control over oil and gas flowing from "blow out" wells |
| 01/25/1994 | US5280766 Subsea pump system |
| 01/19/1994 | EP0579393A1 Sealing method and apparatus for wellheads |
| 01/19/1994 | EP0578681A1 Retrievable bridge plug and a running tool therefor. |
| 01/19/1994 | CN1023564C Process for producing high-temp. sand consolidation agent |
| 01/18/1994 | US5279370 Mechanical cementing packer collar |
| 01/18/1994 | US5279369 Tieback receptacle with upward and downward facing funnel sections |
| 01/18/1994 | US5279365 Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms |
| 01/12/1994 | EP0577931A1 Process for reducing or complete setting of water production during drilling for oil and/or hydrocarbon gas recovery |
| 01/11/1994 | US5277255 Well liner running shoe |
| 01/11/1994 | US5277253 Hydraulic set casing packer |
| 01/11/1994 | US5277249 Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms |
| 01/11/1994 | US5277248 Ball valve type injector and catcher apparatus with adjustable flow control for catching and retrieving paraffin cutting balls |
| 01/11/1994 | US5277225 Undersea hydraulic coupling with pressure-energized seals |
| 01/06/1994 | WO1994000672A1 Stabilizing compositions and methods for stabilizing subterranean formations |
| 01/06/1994 | WO1994000667A1 Introduction of particulate material into a borehole |
| 01/06/1994 | CA2138664A1 Introduction of particulate material into a borehole |
| 01/06/1994 | CA2138030A1 Stabilizing composition and methods for stabilizing subterranean formations |
| 01/05/1994 | EP0577060A2 Acceleration of gelation of water soluble polymers |
| 01/05/1994 | DE4312451A1 Connector for well plugging charges - has perforated side wall and perforated end coupling elements |
| 01/05/1994 | CN2152073Y Petroleum mine well and pipe combined automatic switch |
| 01/04/1994 | US5275511 Method for installation of piles in offshore locations |
| 01/04/1994 | US5275241 Circulating valve apparatus and drill stem test method allowing selective fluid communication between an above packer annulus and a rathole |
| 12/29/1993 | EP0576401A2 Borehole assembly, method and composition therefor |
| 12/29/1993 | CN2151249Y Blow-out preventer as polished rod breaking off |
| 12/29/1993 | CN2151248Y Well head for sucking oil |
| 12/28/1993 | US5273376 Back-up connector release tool |
| 12/28/1993 | US5273117 Subsea wellhead equipment |
| 12/28/1993 | US5273116 Firing mechanism for actuating wellbore tools |
| 12/28/1993 | US5273110 Inflatable devices for suspending explosives and stemming materials in boreholes |
| 12/28/1993 | US5273109 Retrievable packer |
| 12/28/1993 | US5273108 Closure apparatus for blow out prevention |
| 12/23/1993 | WO1993025799A1 Method of creating a wellbore in an underground formation |
| 12/23/1993 | WO1993025797A1 Blowout preventer opening mechanism |
| 12/21/1993 | US5271469 Borehole stressed packer inflation system |
| 12/21/1993 | US5271468 Downhole tool apparatus with non-metallic components and methods of drilling thereof |
| 12/21/1993 | US5271462 Zone isolation apparatus |
| 12/21/1993 | US5271461 Coiled tubing deployed inflatable stimulation tool |
| 12/16/1993 | DE4225806C1 Drilling bit mounting for boring large holes - has clamp within drilling tube with radial expansion against eccentric type carrier |
| 12/15/1993 | CN2149475Y Theft-proof borehole sealing |
| 12/15/1993 | CN1023139C Selective placement of permeability-reducing material to inhibit fluid communication between near well bore interval and underlying aquifer |
| 12/14/1993 | US5269180 Borehole tool, procedures, and interpretation for making permeability measurements of subsurface formations |
| 12/09/1993 | WO1993024730A1 Wellhead |
| 12/09/1993 | WO1993024729A1 Portable oil-drilling waste recovery system |
| 12/09/1993 | WO1993024727A1 Tubing anchor catcher with rotating mandrel |
| 12/09/1993 | CA2136729A1 Portable oil-drilling waste recovery system |
| 12/08/1993 | EP0572732A1 Wellhead |
| 12/07/1993 | US5267814 Mechanism and method for continuously constructing reinforced concrete tunnel |
| 12/07/1993 | US5267617 Downhole tools with inflatable packers and method of operating the same |
| 12/07/1993 | US5267612 Friction plug for a high pressure pipe |
| 12/07/1993 | CA2000064C Drill rod seal |
| 12/01/1993 | EP0475986B1 Method and device for in-situ measurement of ground heave characteristics |
| 12/01/1993 | CN2148174Y Double vee anastomosis drilling well-head |
| 11/30/1993 | US5265980 Junction plate assembly for a subsea structure |
| 11/30/1993 | US5265679 In a wellbore tool string |
| 11/30/1993 | CA1324753C Method of remedial cement squeezing using phenolic-aldehyde gels |
| 11/25/1993 | WO1993023654A1 Top drive apparatus |
| 11/25/1993 | CA2135404A1 Top drive apparatus |
| 11/24/1993 | EP0417084B1 Blowout preventer |
| 11/23/1993 | US5265247 Laboratory data storage and retrieval system and method |
| 11/23/1993 | CA1324624C Elastomer seal structure |
| 11/23/1993 | CA1324573C Method and apparatus for placing a cement lining in a borehole |
| 11/18/1993 | EP0570178A1 Tubular connection, method for making same, and tool therefor |
| 11/18/1993 | EP0570157A2 Downhole tool apparatus with non-metallic slips |
| 11/17/1993 | CN2146566Y Hot cleaning paraffin temp-control packer |
| 11/17/1993 | CN2146565Y Automatic lubricating polish rod sealing device |
| 11/17/1993 | CN2146564Y 可变形弹性密封胶圈 Elastically deformable sealing gasket |
| 11/17/1993 | CN1078532A Method for preparing well-killing liquid for oil-extracting using high temp. salt |
| 11/16/1993 | US5261492 Well casing apparatus and method |
| 11/16/1993 | US5261487 Packoff nipple |
| 11/16/1993 | US5261486 Method and apparatus for gravel pack well completions |
| 11/11/1993 | WO1993022538A1 Method for excavating tunnels, utilisation of a foaming agent and new composition |
| 11/10/1993 | EP0423296B1 Device for blocking off a well in open flow |
| 11/10/1993 | CN2145863Y Emergency back-pressure valve and its fast dismounting and mounting tool |
| 11/10/1993 | CN2145862Y Sealing spacer |
| 11/10/1993 | CN2145861Y Self-check sealing spacer |
| 11/10/1993 | CN2145860Y Adjustable well blowout preventer |
| 11/09/1993 | US5259702 Method for installation of an outer-cased piling |
| 11/09/1993 | US5259459 Subsea wellhead tieback connector |
| 11/09/1993 | US5259458 Subsea shelter and system for installation |
| 11/09/1993 | US5259451 Down hole well tool with pressure relief chamber |
| 11/09/1993 | US5259450 Vented packer for sampling well |
| 11/09/1993 | CA2055656C Wellhead isolation tool and method of use thereof |
| 11/09/1993 | CA1324173C Fire resistant connections and t-like sealing means therefor |
| 11/03/1993 | CN2145261Y Pouring back-pressure valve for automactic drilling liquid with bottom pipe |
| 11/02/1993 | US5257812 Polished rod protection and sealing device |
| 11/02/1993 | US5257792 Well head metal seal |
| 11/02/1993 | US5257663 For use in a well |
| 10/28/1993 | WO1993021419A1 Improved environmental vat |