| Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
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| 02/05/2002 | US6344431 Use of selected inhibitors against the formation of solid organo-based incrustations from fluid hydrocarbon mixtures |
| 02/05/2002 | US6343657 Method of injecting tubing down pipelines |
| 02/05/2002 | US6343653 Chemical injector apparatus and method for oil well treatment |
| 02/05/2002 | US6343652 Method and device for cleaning out a well or piping blocked with gas hydrates |
| 02/05/2002 | US6343648 Down-hole tool with detachable cleaning pads |
| 01/17/2002 | US20020005284 Well cleaning tool |
| 01/16/2002 | EP1171685A1 Method and apparatus for reducing fouling of injection and recovery wells |
| 01/16/2002 | CN2471922Y Light sand washover self sealed oil wiper |
| 01/09/2002 | EP1169648A1 Use of 13c-nmr to detect binding |
| 01/08/2002 | US6336506 Apparatus and method for perforating and stimulating a subterranean formation |
| 01/03/2002 | US20020002116 By using a water soluble maleic anhydride (co)polymer amidated or modified with an amine or alkanolamine, or polymers made from 2-(aminocarbonyl)acrylic acid or salts thereof |
| 01/03/2002 | US20020000316 Method and apparatus for the optimal predistortion of an electromagnetic signal in a downhole communication system |
| 01/02/2002 | EP1167685A2 Method of removing drill cuttings from a deviated borehole |
| 01/02/2002 | EP1165936A1 Novel fluids and techniques for maximizing fracture fluid clean-up |
| 01/02/2002 | EP1165935A1 Method and apparatus for cleaning boreholes |
| 01/02/2002 | CN2469178Y Free rotating joint for sleeve type scraping device |
| 01/02/2002 | CN2469177Y Ultasonic dredging apparatus |
| 01/02/2002 | CN2469176Y Self-turning-back and secondary heating type well washing equipment |
| 12/27/2001 | WO2001098628A1 Well maintenance equipment and procedure |
| 12/26/2001 | CN2467790Y Truck-mounted cleaning well apparatus |
| 12/20/2001 | US20010052414 Scale prediction probe |
| 12/19/2001 | CN2466344Y Strong permanent-maglnet wax deposit preventer for oil production well |
| 12/12/2001 | CN2464931Y Chemical wax-removing, thinning balance agent-adding device for oil gas well |
| 12/05/2001 | EP0777837B1 A method for inhibiting hydrate formation |
| 12/05/2001 | CN2463537Y Automatic paraffin removal unit for pump well |
| 12/04/2001 | US6326335 Mixture of gelatin, weighting agent and chelate compound |
| 12/04/2001 | US6325305 Fluid jetting apparatus |
| 12/04/2001 | CA2196552C Method for removing alkaline sulfate scale |
| 11/29/2001 | DE10023454A1 Method to prevent incrustations in wells uses appliance with pressure vessel to introduce pneumatic pressure waves into gravel bed in filter tube |
| 11/28/2001 | CN2462070Y Oil discharging flushing valve |
| 11/22/2001 | US20010043838 Skate apparatus for injecting tubing down pipelines |
| 11/22/2001 | US20010042623 Method and apparatus for cleaning wellbore casing |
| 11/21/2001 | CN2460723Y Rod-type automatic dewax device for pumping well |
| 11/21/2001 | CN2460722Y High-pressure well cleaning device for pumping well |
| 11/15/2001 | US20010040035 Downhole apparatus |
| 11/13/2001 | US6315498 Thruster pig apparatus for injecting tubing down pipelines |
| 11/13/2001 | US6315046 Method of servicing a well |
| 11/06/2001 | US6313367 Inhibition of asphaltene deposition in crude oil production systems |
| 11/01/2001 | US20010035290 Washpipe stabilization system |
| 10/31/2001 | CN2457338Y Dowdhole tool and well head equipment for well feeding solid chemicals |
| 10/31/2001 | CN2457337Y Rotary centralizing paraffin scrapper |
| 10/30/2001 | US6308781 Apparatus for retrieving metal objects from a wellbore |
| 10/30/2001 | US6308780 Method for regaining mud circulation in operating well and device for its embodiment |
| 10/23/2001 | CA2191540C Electrical apparatus for controlling liquid contaminants |
| 10/18/2001 | WO2001077491A2 Electropolishing method for oil field tubular goods and drill pipe |
| 10/16/2001 | US6302204 Method of obtaining improved geophysical information about earth formations |
| 10/16/2001 | US6302201 Method and apparatus for washing subsea drilling rig equipment and retrieving wear bushings |
| 10/11/2001 | WO2001075265A1 New and improved method and apparatus for cleaning wellbore casing |
| 10/11/2001 | US20010027867 Electropolishing method for oil field tubular goods and drill pipe |
| 10/10/2001 | CN2453128Y Scale proof means for oil well |
| 10/04/2001 | WO2001073263A1 Method for improving well quality |
| 10/04/2001 | WO2001073262A2 Sand removal and device retrieval tool |
| 10/04/2001 | WO2001073253A1 Method and cleaning fluid for use in well cleaning and subsequent treatment of the used cleaning solution, as well as use of a particular fluid mixture |
| 10/04/2001 | CA2404664A1 Method for improving well quality |
| 10/02/2001 | US6296058 Wellbottom fluid implosion treatment system |
| 10/02/2001 | US6296055 Combination retrievable drilling fluid filter and wiper |
| 09/27/2001 | WO2001071158A1 Subsea production system |
| 09/27/2001 | US20010023614 Monitoring of downhole parameters and tools utilizing fiber optics |
| 09/26/2001 | CN2450383Y Production uninterrupted sand cleaning controller for pumping well |
| 09/24/2001 | CA2342089A1 Method of early prediction of the risk of paraffin dirt during production and transportation |
| 09/20/2001 | WO2001069036A1 Downhole surge pressure reduction and filtering apparatus |
| 09/20/2001 | US20010022223 Downhole cleaning tool with shear clutch |
| 09/19/2001 | CN2448921Y Plunger piston type hydraulic pressure valve |
| 09/19/2001 | CN1071397C Negative pressure sand-scouring technology and mechanism |
| 09/18/2001 | US6289987 Integral blade downhole wash tool |
| 09/13/2001 | WO2001066907A1 Clean out tool |
| 09/13/2001 | US20010020675 Wellbores utilizing fiber optic-based sensors and operating devices |
| 09/12/2001 | CN1312882A Apparatus and method for perforating and stimulating a subterranean formation |
| 09/07/2001 | WO2001065060A1 Improving reservoir communication with a wellbore |
| 09/07/2001 | WO2001065055A1 Controlled downhole chemical injection |
| 09/06/2001 | US20010018976 Apparatus and method for cleaning well risers |
| 08/30/2001 | WO2001063087A1 Bore cleaning |
| 08/29/2001 | CN1310283A Telescopic stratum blockage cleaner with fixed tubular column |
| 08/28/2001 | US6281489 Monitoring of downhole parameters and tools utilizing fiber optics |
| 08/28/2001 | US6279657 Apparatus and method for circulating fluid in a well bore |
| 08/22/2001 | CN2444056Y Scraper tool for casing of oil well |
| 08/21/2001 | US6276452 Apparatus for removal of milling debris |
| 08/16/2001 | WO2001059255A1 Method of treating reservoir zone of hydrocarbon producing well to inhibit water production problems |
| 08/16/2001 | US20010013413 Apparatus for retrieving metal objects from a wellbore |
| 08/14/2001 | US6273187 Method and apparatus for downhole safety valve remediation |
| 08/14/2001 | CA2155512C Application of n, n-dialkylamides to reduce precipitation of asphalt from crude oil |
| 08/09/2001 | US20010011591 Guide device |
| 08/07/2001 | US6269880 System for removing solids from a well bore |
| 08/02/2001 | WO2001055281A1 Inhibition of asphaltene deposition in crude oil production systems |
| 08/02/2001 | DE19913239A1 Verfahren zum Reinigen von Brunnenanlagen und Gerät für die Durchführung des Verfahrens A method of cleaning well systems and apparatus for carrying out the method |
| 08/01/2001 | CN1306149A Technology for removing stratum blocking of oil well or water injection well by means of ClO2/hydrochloric acid composition |
| 08/01/2001 | CN1306147A Radiation-type fluid-dynamic sound-wave wax preventor |
| 07/31/2001 | US6268911 Monitoring of downhole parameters and tools utilizing fiber optics |
| 07/25/2001 | EP0727009B1 Well cleanout system and method |
| 07/25/2001 | CN1305563A Method for preventing deposits in oil extraction |
| 07/25/2001 | CN1305048A Technology for washing well by screw pump with hollow rotor |
| 07/17/2001 | US6260621 Forcing particles into oil or gas formation under pressure; mixing with fatty ester and lower alkyl glycol ether; cleaning |
| 07/17/2001 | US6260620 Mixing with fatty acid alkyl ester and lower alkyl glycol ether; agitation |
| 07/17/2001 | US6260617 Skate apparatus for injecting tubing down pipelines |
| 07/11/2001 | CN1068372C Hydrocarbon composition for removing alphaltenes in oil well and its use |
| 07/03/2001 | US6253861 Circulation tool |
| 07/03/2001 | US6253848 Method of obtaining improved geophysical information about earth formations |
| 06/27/2001 | CN2436647Y Flexible axle and tube borehole cleaner |
| 06/26/2001 | US6250389 Method of oil/gas well stimulation |
| 06/26/2001 | US6250388 Gas impulse device and method of use thereof |