| Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
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| 09/06/2000 | CN2395029Y Rotary spray quick well flushing unit |
| 08/30/2000 | CN2394002Y Clean hole device for sucking pump |
| 08/30/2000 | CN2394001Y De-waxing apparatus of drilling well |
| 08/23/2000 | CN2392912Y Anti-dropping device for scraper column of casing |
| 08/16/2000 | EP1027525A1 An apparatus for the removal of sand in an underwater well and use of a jet pump (ejector) in connection with such sand removal |
| 08/09/2000 | CN2391007Y Oil water well double-function swab |
| 07/12/2000 | EP1017925A1 Method and compound for inhibiting the plugging of conduits by gas hydrates |
| 07/11/2000 | US6085844 Method for removal of undesired fluids from a wellbore |
| 07/04/2000 | US6082450 Apparatus and method for stimulating a subterranean formation |
| 06/29/2000 | WO2000037777A1 Novel fluids and techniques for maximizing fracture fluid clean-up |
| 06/29/2000 | WO2000037770A1 Closed loop chemical injection and monitoring system for oilfield operations |
| 06/20/2000 | US6076603 Method for removal and treatment of paraffin |
| 06/13/2000 | US6073696 Method and assembly for treating and producing a welbore using dual tubing strings |
| 05/25/2000 | WO2000029711A1 Method for removal of undesired fluids from a wellbore |
| 05/25/2000 | WO2000028826A2 Oil well productivity stimulation |
| 05/23/2000 | US6065541 Cleaning device |
| 05/23/2000 | US6065538 Method of obtaining improved geophysical information about earth formations |
| 05/17/2000 | CN2378533Y Apparatus for cleaning waterwell sand out and gravel stuffing |
| 05/16/2000 | US6062311 Jetting tool for well cleaning |
| 05/10/2000 | CN2377346Y Hot-cleaning machine |
| 05/10/2000 | CN2377345Y Wax removal vehicle |
| 05/09/2000 | US6059032 Method and apparatus for treating long formation intervals |
| 05/09/2000 | US6059030 Sand recovery unit |
| 04/13/2000 | DE19843292A1 Equipment for cleaning spring wells, pipelines and vessels using pressure pulses, comprises cylinder containing pressure chamber with piston supported on elastic material |
| 04/12/2000 | EP0681640B1 Application of n,n-dialkylamides to reduce precipitation of asphalt from crude oil |
| 03/30/2000 | WO2000017484A1 Method for dissolution, storage and transportation of gas hydrates |
| 03/29/2000 | EP0988440A1 Control and monitoring system for chemical treatment of an oilfield well |
| 03/29/2000 | EP0764061A4 Method for removing alkaline earth metal scale |
| 03/29/2000 | CN2371335Y Automatic wax cleaner reversing mechanism for sucker rod type beam-pumping unit well |
| 03/28/2000 | US6042713 Method for removing metal contaminants |
| 03/23/2000 | WO2000015945A1 Method and apparatus for downhole safety valve remediation |
| 03/22/2000 | EP0986691A1 Conduit cleaning material and process |
| 03/22/2000 | CN2370155Y Wall cleaning guage for oil well pipe wall |
| 03/21/2000 | US6039117 Downhole wash tool |
| 03/16/2000 | WO2000014378A1 Gas impulse device and method of use thereof |
| 03/16/2000 | CA2384087A1 Gas impulse device and method of use thereof |
| 03/09/2000 | WO2000012864A1 A reverse circulating tool for cleaning a well |
| 03/09/2000 | DE19839873A1 Arrangement for raising and lowering cleaning device in vertical, clad earth shaft, e.g. well shaft, has motor-driven winch above ground with pipe section on drum with central connector |
| 03/07/2000 | US6032741 Abrasives for well cleaning |
| 03/01/2000 | CN2366550Y Drift diameter gauge for well-cleaning |
| 02/29/2000 | US6029746 Self-excited jet stimulation tool for cleaning and stimulating wells |
| 02/17/2000 | WO2000008300A1 Downhole scraper assembly |
| 02/16/2000 | CN2364207Y Chemical wax control drop feeding device |
| 02/15/2000 | CA2268223C A method of cleaning a well that is contaminated by accumulations of sa nd |
| 02/02/2000 | EP0976853A1 Method for removing alkaline earth metal sulfate scale from a boiler or heat exchanger with use of sonic energy |
| 01/27/2000 | WO1999057416A8 Jet cleaning apparatus |
| 01/26/2000 | EP0772696B1 Method for removing alkaline sulfate scale |
| 01/25/2000 | US6016872 Method for removing debris from a well-bore |
| 01/19/2000 | CN2359460Y Water jacket type circulation paraffin removal device |
| 01/19/2000 | CN2359459Y Jet foam generator for foam sand wash |
| 01/19/2000 | CN1241609A Wax coagulation preventing agent and its compounding process |
| 01/19/2000 | CN1241608A Wax coagulation preventing agent and its compounding process |
| 01/13/2000 | WO2000001924A1 Apparatus and method for perforating and stimulating a subterranean formation |
| 01/13/2000 | CA2336414A1 Apparatus and method for perforating and stimulating a subterranean formation |
| 01/12/2000 | CN1048311C Oil-well self hot-washing wax-removing method and apparatus |
| 01/04/2000 | CA2197802C A method for inhibiting hydrate formation |
| 12/28/1999 | US6006832 Method and system for monitoring and controlling production and injection wells having permanent downhole formation evaluation sensors |
| 12/20/1999 | CA2275815A1 Bore hole clearing |
| 12/16/1999 | WO1999064716A1 Method for preventing deposits in oil extraction |
| 12/15/1999 | CN2353884Y Oil wiper for pumping rod |
| 12/08/1999 | EP0962624A1 Device for making or regenerating water wells |
| 12/08/1999 | CN1238023A On-line thermo-chemical process for dewaxing of oil export pipelines |
| 12/01/1999 | EP0960263A2 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 12/01/1999 | CN2351547Y Borehole-circulation washovering sand technology pipe |
| 11/18/1999 | WO1999058807A1 Guide device |
| 11/17/1999 | EP0956427A1 On-line, thermo-chemical process for the dewaxing of oil export pipelines |
| 11/17/1999 | CN2349345Y Piston type wax cleaner for oil well |
| 11/16/1999 | US5984011 Method for removal of cuttings from a deviated wellbore drilled with coiled tubing |
| 11/11/1999 | WO1999057416A1 Jet cleaning apparatus |
| 11/10/1999 | EP0954676A1 Device for rinsing gas and oil bore holes of underground extraction machinery |
| 11/03/1999 | EP0845070B1 Scraper for removing an earth core from a pipe laid without excavation |
| 11/03/1999 | CN2346929Y Bow rotating producing well descaling and decerating appts. |
| 10/28/1999 | WO1999054590A1 An apparatus, a system and a method for washing a tubular in a wellbore |
| 10/28/1999 | CA2329744A1 An apparatus, a system and a method for washing a tubular in a wellbore |
| 10/27/1999 | CN2345689Y In-out apparatus down well following oil tube column for wax scraper |
| 10/27/1999 | CN2345688Y Underground sand-wash wax scraper |
| 10/27/1999 | CN2345687Y Suspended wax scraper |
| 10/27/1999 | CN2345682Y Once formed type spacing righting wax scraping device for sucker rod |
| 10/27/1999 | CN1232855A Oil well wax clearing agent for oil field |
| 10/14/1999 | WO1999051853A1 Apparatus and method for stimulating a subterranean formation |
| 10/12/1999 | US5964291 Fracturing using high pressure fluid and proppant particles |
| 10/06/1999 | CN2342086Y Eccentric roller type scale cleaning drill |
| 09/30/1999 | WO1999049181A1 A method of stimulating an oil/gas well and equipment for use therein |
| 09/29/1999 | CN2340894Y Mechanical oil sweeper for oil sucker |
| 09/28/1999 | US5959547 Well control systems employing downhole network |
| 09/28/1999 | US5957205 Sand exclusion liner and method of using the same |
| 09/22/1999 | EP0777837A4 A method for inhibiting hydrate formation |
| 09/22/1999 | CN2339746Y Multistage multi-group self-sealing well swab |
| 09/11/1999 | CA2265039A1 Apparatus for removal of milling debris |
| 09/10/1999 | WO1999045227A1 Method for removal of cuttings from a deviated wellbore drilled with coiled tubing |
| 09/08/1999 | EP0939855A1 Additives for inhibiting formation of gas hydrates |
| 09/07/1999 | US5947203 Method of cleaning a down hole casing string |
| 09/02/1999 | WO1999027223A3 Method and apparatus for injecting coil tubing down pipelines |
| 08/05/1999 | DE19823401C1 Method for cleaning chimney stack |
| 08/04/1999 | EP0932746A2 Use of alkanesulphonic acids as asphaltene dispersants |
| 08/03/1999 | CA2134980C Microencapsulated oil field chemicals and process for their use |
| 08/03/1999 | CA2099012C Well cleanout using caustic alkyl polyglycoside compositions |
| 07/29/1999 | WO1999037396A1 Microencapsulated drag reducing agents |
| 07/20/1999 | US5925233 Use of alkanesulfonic acids as asphaltene-dispersing agents |
| 07/20/1999 | US5924490 Well treatment tool and method of using the same |