| Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
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| 07/14/1999 | EP0824631B1 Method for inhibiting the plugging of conduits by gas hydrates |
| 07/14/1999 | CN2328787Y Paraffin removing device for oil pipe and floor |
| 07/14/1999 | CN1222950A Apparatus and method for perforating and stimulating subterranean formation |
| 07/13/1999 | US5922652 Microencapsulated oil field chemicals |
| 06/30/1999 | EP0925423A1 Apparatus and method for perforating and stimulating a subterranean formation |
| 06/24/1999 | WO1999031200A1 A method of improving the flow properties of a crude oil or natural gas liquid |
| 06/09/1999 | EP0921268A2 Apparatus for cleaning well tubular members |
| 06/08/1999 | US5909774 Synthetic oil-water emulsion drill-in fluid cleanup methods |
| 06/03/1999 | WO1999027223A2 Method and apparatus for injecting coil tubing down pipelines |
| 05/12/1999 | CN1216336A Negative pressure sand-scouring technology and mechanism |
| 05/06/1999 | WO1999022116A1 An apparatus for the removal of sand in an underwater well and use of a jet pump (ejector) in connection with such sand removal |
| 04/28/1999 | EP0910725A1 Wellbores utilizing fiber optic-based sensors and operating devices |
| 04/28/1999 | EP0745175B1 Process for removing the core of earth from a pipe laid without excavation and scraper for implementing said process |
| 04/13/1999 | US5893416 Porous ceramic beads; tubular filter inhibiting corrosion and sclae formation |
| 04/06/1999 | US5891262 Dewaxing fluid comprises solution of nitrogen salts activated by emulsified acetic acid and solvent, which is the petroleum oil being produced |
| 03/30/1999 | US5887925 Combined washover and retrieval device |
| 03/23/1999 | US5884700 Interior coating of gas well tubing |
| 03/23/1999 | CA2149591C Method and apparatus for downhole sand clean-out operations in the petroleum industry |
| 03/18/1999 | WO1999013197A1 Method and compound for inhibiting the plugging of conduits by gas hydrates |
| 03/16/1999 | CA2215652A1 Chemical treatment device for well and pipeline applications |
| 03/09/1999 | US5879561 Adding quaternary ammonium or phosphonium hydrate formation inhibitor to mixture of hydrocarbons and water flowing through conduit |
| 03/03/1999 | EP0898638A1 Washpipe stabilisation |
| 02/24/1999 | EP0897456A2 Multi-lateral wellbore systems and methods for forming same |
| 02/24/1999 | CN1042254C Method for increasing oil prodn. and reducing precipitation of asphalt from crude oil in dill hole |
| 02/09/1999 | US5868210 Method for recovering hydrocarbons from earth formations |
| 02/04/1999 | WO1998050680A3 Monitoring of downhole parameters and tools utilizing fiber optics |
| 02/02/1999 | US5865249 Method and apparatus for washing a horizontal wellbore with coiled tubing |
| 01/27/1999 | EP0819207A4 Method for improved water well production |
| 01/21/1999 | WO1999002819A1 Computer controlled injection wells |
| 01/13/1999 | CN2303929Y Magnetic dewaxing apparatus for oil-extraction well in oil-field |
| 01/12/1999 | CA2129620C Well pump tubing scrapers |
| 12/30/1998 | EP0886719A1 A process and a formulation to inhibit scale in oil field production |
| 12/30/1998 | EP0853651A4 Cleaning compositions for oil and gas wells, lines, casings, formations and equipment and methods of use |
| 12/30/1998 | EP0812307B1 Method for inhibiting hydrate formation |
| 12/23/1998 | CN1202922A Cleaning compositions for oil and gas well, lines, casings, formations and equipment and its methods of use |
| 12/17/1998 | WO1998057030A1 Control and monitoring system for chemical treatment of an oilfield well |
| 12/03/1998 | WO1998054440A1 Method and device for cleaning out a well or piping blocked with gas hydrates |
| 11/24/1998 | US5839511 Blowout preventer wash-out tool |
| 11/19/1998 | WO1998051901A1 Conduit cleaning material and process |
| 11/19/1998 | WO1998035131A3 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 11/18/1998 | CN2297535Y Short-circuit hot-washing paraffin-remover for oil well |
| 11/17/1998 | US5836394 Well regeneration apparatus |
| 11/17/1998 | US5836393 Pulse generator for oil well and method of stimulating the flow of liquid |
| 11/12/1998 | WO1998050681A1 Wellbores utilizing fiber optic-based sensors and operating devices |
| 11/12/1998 | WO1998050680A2 Monitoring of downhole parameters and tools utilizing fiber optics |
| 11/03/1998 | US5829521 Method of cleaning a casing string |
| 10/28/1998 | EP0874067A2 Apparatus and method for removing metal or mineral contaminants, especially for oil drilling equipments |
| 10/13/1998 | US5819353 Tool for cleaning or conditioning tubular structures such as well casings |
| 10/11/1998 | CA2228203A1 Method and apparatus for washing a horizontal wellbore with coiled tubing |
| 10/08/1998 | DE19713737A1 Method of discharging earth's core from pipe |
| 10/07/1998 | EP0869201A2 Method for preventing metal deposition and an oil or gas well with electrically contacting means |
| 10/07/1998 | CN2293642Y Centrifugal steel brush using for inside of petroleum casing |
| 09/30/1998 | EP0867495A2 Method for removing debris from a well-bore |
| 09/24/1998 | DE19711135A1 Ultrasound cleaning, regenerating, and rehabilitating arrangement |
| 09/22/1998 | US5810410 Combined washover and retrieval device |
| 09/15/1998 | US5806404 Rotary piston driving mechanism |
| 09/09/1998 | EP0638049B1 Process for preventing deposits in a structure's drainage system |
| 09/09/1998 | CN2290693Y Automatic wax cleaner of oil well |
| 09/03/1998 | DE19702197C1 Vorrichtung zum Spülen von Gas- und Ölbohrungen einer Untertage-Förderausrüstung An apparatus for flushing of oil and gas drilling an underground conveyor equipment |
| 08/27/1998 | WO1998037305A1 Novel down hole device and method |
| 08/13/1998 | WO1998035131A2 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 08/04/1998 | US5788781 Contacting with mixture of surfactants having specified hydrophilic-lipophilic balance in nonpolar diluent oil, rinsing with water |
| 07/30/1998 | WO1998032949A1 Device for rinsing gas and oil bore holes of underground extraction machinery |
| 07/30/1998 | CA2278126A1 Device for flushing gas and oil bore holes of underground extraction machinery |
| 07/23/1998 | WO1998031917A1 On-line, thermo-chemical process for the dewaxing of oil export pipelines |
| 07/22/1998 | EP0853651A1 Cleaning compositions for oil and gas wells, lines, casings, formations and equipment and methods of use |
| 07/16/1998 | WO1998030783A1 A process and a formulation to inhibit scale in oil field production |
| 07/15/1998 | CN2286241Y Paraffin removing scraper for pumping well pipe |
| 07/14/1998 | US5780407 Includes a surfactant and a diluent oil; useful in cleaning oil-contaminated substrates |
| 07/08/1998 | EP0608238B1 Electro-vac decontamination process |
| 07/08/1998 | CN1187181A Method for inhibiting hydrate formation |
| 07/07/1998 | US5775426 Apparatus and method for perforating and stimulating a subterranean formation |
| 07/02/1998 | WO1998028519A1 Method of oil/gas well stimulation |
| 06/24/1998 | CN1185516A Oil-well self hot-washing wax-removing method and apparatus thereof |
| 06/23/1998 | US5769172 Power tool |
| 06/23/1998 | US5769164 Wellbore cleaning tool |
| 06/17/1998 | CN1185191A Method for inhibiting the plugging of conduits by gas hydrates |
| 06/09/1998 | US5762149 Method and apparatus for well bore construction |
| 06/04/1998 | WO1998023843A1 Additives for inhibiting formation of gas hydrates |
| 06/03/1998 | EP0845070A1 Scraper for removing an earth core from a pipe laid without excavation |
| 06/02/1998 | US5758730 Method for removing an earth core out of a pipe laid in trench-less manner and go-devil for implementing the method |
| 06/02/1998 | US5758725 Method and device for enhancing oil and gas flow in a well |
| 05/26/1998 | US5755970 Method for reduction of pipeline accumulation |
| 05/26/1998 | US5755284 Used on a rod string powering a progressing cavity pump |
| 05/22/1998 | WO1998016718A3 Use of alkanesulphonic acids as asphaltene dispersants |
| 05/20/1998 | CN2282063Y Magnetic scale-proof and descaling device of oil field well-flushing dewaxing automobile |
| 05/13/1998 | CN2281417Y Oil scraper for sucker rod |
| 05/06/1998 | EP0699269A4 Method for placement of a scale inhibitor in a formation |
| 05/06/1998 | CN1038269C Wax removing bullet for oil well |
| 05/05/1998 | US5746923 Antideposit agents for pumping systems and feeding chlorinated water with surfactants |
| 04/29/1998 | EP0618995B1 Use of selected inhibitors against the formation of solid organic-based incrustations from fluid hydrocarbon mixtures |
| 04/23/1998 | WO1998016718A2 Use of alkanesulphonic acids as asphaltene dispersants |
| 04/23/1998 | CA2268821A1 Use of alkanesulphonic acids as asphaltene dispersants |
| 04/16/1998 | WO1998015850A1 Method of obtaining improved geophysical information about earth formations |
| 04/16/1998 | DE19642493A1 Verwendung von Alkansulfonsäuren als Asphalten-Dispergatoren Use of alkane sulfonic acids as asphaltene dispersants |
| 04/15/1998 | CN2278767Y Rotary Scraper for downhole operation |
| 03/31/1998 | US5732774 Drill wiper assembly |
| 03/19/1998 | WO1998003309A3 Power tool |
| 03/17/1998 | US5727628 Method and apparatus for cleaning wells with ultrasonics |
| 03/12/1998 | WO1998010167A1 Apparatus and method for perforating and stimulating a subterranean formation |