| Patents for E21B 36 - Heating, cooling, or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones (4,262) |
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| 10/07/1998 | CN1195066A Pumping heating 2 in 1 vane pump oil production method and its device |
| 10/06/1998 | US5816325 Methods and apparatus for enhanced recovery of viscous deposits by thermal stimulation |
| 09/29/1998 | US5813799 Combustion process and apparatus for removing volatile contaminants from groundwater or subsurface soil |
| 09/23/1998 | EP0866212A1 Installation for production well |
| 09/18/1998 | CA2230771A1 Installation for effluent producing well |
| 09/17/1998 | WO1998040603A2 Apparatus and methods for generating energy utilizing downhole processed fuel |
| 09/16/1998 | CN2291498Y Downhole petroleum heating controller |
| 09/11/1998 | WO1998039552A1 Samplers for high-temperature fluids |
| 09/09/1998 | CN2290692Y Well cable-less frequency-conversion electrical heating oil extracting appts. |
| 08/05/1998 | EP0698136B1 Preform or matrix tubular structure for well casing |
| 08/05/1998 | EP0558534B1 Well completion system |
| 07/23/1998 | WO1998015712A3 Method of forming wellbores from a main wellbore |
| 07/21/1998 | US5784530 Iterated electrodes for oil wells |
| 07/21/1998 | US5782301 Oil well heater cable |
| 07/15/1998 | CN2286240Y Electric cable protector in heating rod |
| 07/09/1998 | WO1998029369A1 Method for recovering gas from hydrates |
| 07/09/1998 | CA2273054A1 Method for recovering gas from hydrates |
| 07/02/1998 | WO1998028520A1 Device and method for heating a treating fluid |
| 07/02/1998 | CA2276048A1 Device and method for heating a treating fluid |
| 06/24/1998 | CN1185516A Oil-well self hot-washing wax-removing method and apparatus thereof |
| 06/23/1998 | US5769569 To remove contaminants from soils located above water table |
| 06/16/1998 | US5765964 Combustion, pressure |
| 06/04/1998 | WO1998023842A1 Methods and apparatus for enhanced recovery of viscous deposits by thermal stimulation |
| 05/27/1998 | CN2282600Y Combined large-power electric heating rod |
| 05/12/1998 | US5751895 Selective excitation of heating electrodes for oil wells |
| 05/06/1998 | EP0839255A1 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing |
| 04/29/1998 | CN1180130A Oil pipe heating method and its device |
| 04/16/1998 | WO1998016089A1 Oil well heater cable |
| 04/16/1998 | WO1998015712A2 Method of forming wellbores from a main wellbore |
| 04/15/1998 | EP0727008A4 Method for stimulation of liquid flow in a well |
| 04/15/1998 | CN2278766Y Energy-saving electric heater for oil well oil transportation pipeline |
| 04/08/1998 | EP0834541A1 Method of decomposing gas hydrates |
| 04/01/1998 | EP0832699A1 Process and installation for bio-dielectrically decontamination of contaminated soil |
| 03/24/1998 | US5730217 Vacuum insulated converter for extending the life span of electronic components |
| 03/24/1998 | CA2078872C Thermal mineral extraction system |
| 03/18/1998 | CN2276556Y Oil well heater |
| 03/18/1998 | CN2276555Y Bore oil-reservior frequency-modulated heater |
| 02/24/1998 | US5720342 Integrated converter for extending the life span of electronic components |
| 02/10/1998 | US5715895 Downhole drilling tool cooling system |
| 02/03/1998 | US5713416 Methods of decomposing gas hydrates |
| 02/03/1998 | US5713415 Low flux leakage cables and cable terminations for A.C. electrical heating of oil deposits |
| 02/03/1998 | CA2089800C Method and apparatus for improved oil recovery of oil and bitumen using dual completion cyclic steam stimulation |
| 01/14/1998 | CN2272485Y Freeze-proof sampling heater for oil-field |
| 12/24/1997 | WO1997048881A1 Integrated converter for extending the life span of electronic components |
| 12/24/1997 | WO1997048504A1 In-situ thermal desorption of heavy hydrocarbons in vadose zone |
| 12/23/1997 | USRE35696 Heat injection process |
| 12/17/1997 | EP0636228B1 Compressing combustible gas flowing through a conduit |
| 12/16/1997 | US5697218 System for geothermal production of electricity |
| 12/09/1997 | US5695008 Preform or matrix tubular structure for casing a well |
| 12/04/1997 | WO1997033070A3 Downhole flow stimulation in a natural gas well |
| 10/22/1997 | CN1162688A Multifunctional sealed oil storing device of oil well |
| 10/14/1997 | US5677267 Thixotropic fluid for well insulation |
| 10/08/1997 | CN2264249Y Oil pipe electrical heating appts. |
| 09/25/1997 | WO1997035093A1 Method and apparatus using coiled-in-coiled tubing |
| 09/12/1997 | WO1997033070A2 Downhole flow stimulation in a natural gas well |
| 09/03/1997 | EP0792408A2 Downhole system for extending the life span of electronic components |
| 09/02/1997 | US5661977 System for capturing geothermal heat using electrolytic reactions |
| 08/14/1997 | CA2174879A1 Iterated electrodes for oil wells |
| 08/12/1997 | US5656136 Method of transporting and heating a liquid used for treating oil and gas wells or pipeline systems |
| 08/05/1997 | US5653287 Placing low thermal conductivity tubing in cased well bore, providing heat transfer barrier between casing and tubing, injecting liquid nitrogen through tubing to contact face of well bore, flowing gas down annulus between casing and tubing |
| 07/30/1997 | EP0522044B1 Thermal mineral extraction system |
| 07/22/1997 | US5649594 Method and apparatus for servicing a wellhead assembly |
| 07/10/1997 | WO1997024510A1 Flameless combustor |
| 07/10/1997 | WO1997024509A1 Flameless combustor |
| 06/24/1997 | US5641022 Method for removing paraffin and asphaltene from producing wells |
| 06/17/1997 | US5638904 Within wells |
| 06/05/1997 | DE19625125C1 Soil sample extraction method |
| 06/04/1997 | EP0777034A1 Stiffening element for a flexible pipeline in a marine environment |
| 05/14/1997 | CN1149902A Double walled insulated tubing and method for installing same |
| 05/02/1997 | EP0770168A1 Downhole electrical heating system |
| 04/22/1997 | US5623576 Downhole radial flow steam generator for oil wells |
| 04/16/1997 | CN2252235Y Wellhead crude oil heating parts |
| 04/15/1997 | US5621845 Apparatus for electrode heating of earth for recovery of subsurface volatiles and semi-volatiles |
| 04/15/1997 | US5621844 Electrical heating of mineral well deposits using downhole impedance transformation networks |
| 04/09/1997 | CN2251616Y Heating device for oil well |
| 04/08/1997 | US5619611 Device for removing downhole deposits utilizing tubular housing and passing electric current through fluid heating medium contained therein |
| 03/26/1997 | CN2250420Y Crude oil heater for oil production well head |
| 03/12/1997 | EP0760898A1 Double walled insulated tubing and method of installing same |
| 03/04/1997 | US5607901 Environmentally safe annular fluid |
| 03/04/1997 | US5607018 Viscid oil well completion |
| 02/13/1997 | WO1997005361A1 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing |
| 01/29/1997 | EP0755497A1 Facility for effecting energy exchange between the ground and an energy exchanger |
| 01/09/1997 | WO1997001017A1 Insulated and/or concentric coiled tubing |
| 01/08/1997 | CN1139729A Heating furnace fire-tube protector and method for oil field |
| 12/31/1996 | CA2171023C Downhole heating system with separate wiring, cooling and heating chambers, and gas flow therethrough |
| 12/17/1996 | US5586213 Ionic contact media for electrodes and soil in conduction heating |
| 12/12/1996 | WO1996039267A1 Combustion facilitated waste and pollution treatment |
| 12/04/1996 | CN2241771Y infrared, induction petroleum electric heating device |
| 12/04/1996 | CN2241770Y Downhole high-performance electrothermal film heating device |
| 11/20/1996 | EP0636229B1 Procedure and apparatus for compressing gas flowing through a conduit |
| 11/13/1996 | CN2240040Y Electrical heating film type crude oil heater |
| 10/15/1996 | US5564861 Thermal method of in-situ soil treatment |
| 10/09/1996 | CN2237111Y Heater for pipe electric heating film |
| 10/09/1996 | CN2237110Y Midway shut-in well device for electric pump well work |
| 09/24/1996 | US5558463 Soil remediation apparatus and method |
| 09/10/1996 | US5553666 For use in a fluid production well |
| 09/03/1996 | US5551242 Flameless nitrogen skid unit |
| 08/21/1996 | EP0727008A1 Method for stimulation of liquid flow in a well |
| 08/20/1996 | US5547028 Downhole system for extending the life span of electronic components |
| 08/14/1996 | CN2232977Y Positive temp coefficient resistance pipeline heater |