| Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780) |
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| 06/22/1993 | US5222048 Method for determining borehole fluid influx |
| 06/22/1993 | US5220961 Assembly comprising an extension tube and a sleeving conduit inside this tube |
| 06/22/1993 | CA1319361C Drill pipes and casings utilizing multi-conduit tubulars |
| 06/16/1993 | CN2136322Y Flush coupling |
| 06/16/1993 | CN1073235A Integrated oil field gas injection distribution controller |
| 06/15/1993 | US5219247 Method of forming consolidating earth columns by injection, the relevant plant with double chamber pneumatic hammer boring drill and the resulting column |
| 06/10/1993 | WO1993011336A1 Mud check valves in drilling apparatus (wells) |
| 06/09/1993 | CN1072988A An apparatus and method for removing debris from a drillhole |
| 06/02/1993 | CN2135056Y Separating sereen for compound drilling fluid |
| 06/01/1993 | US5215596 Separation of oils from solids |
| 05/26/1993 | EP0543140A2 Drilling device for civil engineering and method for making stabilizing columns or similar structures in the ground |
| 05/25/1993 | US5214251 Ultrasonic measurement apparatus and method |
| 05/25/1993 | US5213625 Carboxylic acid cleansing agent |
| 05/25/1993 | US5213446 Adding a crosslinkable polymer and a crosslinking agent |
| 05/25/1993 | US5213414 Mixing apparatus |
| 05/25/1993 | US5213169 Exploration-sampling drilling system |
| 05/25/1993 | US5212891 Soft excavator |
| 05/25/1993 | CA1318242C Method for plugging lost circulation areas and lost circulation material to be used therefor |
| 05/22/1993 | CA2082488A1 Mechanically actuated fluid control device for downhole fluid motor |
| 05/19/1993 | EP0541942A1 Drill tube |
| 05/18/1993 | US5211715 Coring with tubing run tools from a producing well |
| 05/18/1993 | US5211250 Potassium salt, polymer of high moecular weight |
| 05/18/1993 | US5211228 Diverter system |
| 05/13/1993 | WO1993009369A1 Gravel-packed pipeline and method and apparatus for installation thereof |
| 05/13/1993 | DE4134912A1 Impact tool for pipe jacking through ground - consists of driving tube with cutting head housing piston, which activates chisel headed striker |
| 05/13/1993 | CA2121479A1 Gravel-packed pipeline and method and apparatus for installation thereof |
| 05/11/1993 | US5209605 Gravel-packed pipeline and method and apparatus for installation thereof |
| 05/11/1993 | US5209311 Drill string component |
| 05/11/1993 | US5209310 Corebarrel |
| 05/11/1993 | CA1317604C Device for evacuating excavated material for making deep tranches |
| 05/11/1993 | CA1317526C Pressurized check valve |
| 05/10/1993 | CA2081681A1 Boring tube |
| 05/04/1993 | US5207282 Method for inhibiting the initiation and propagation of formation fractures while drilling and casing a well |
| 04/29/1993 | DE4235936A1 Underground pipes jacking mechanism - has drive set with axial piston hydraulic motor with rams on drive head tubular housing |
| 04/27/1993 | US5205364 Process and drilling equipment for sinking a well in underground rock formations |
| 04/27/1993 | US5205325 Flow control valve |
| 04/27/1993 | US5205166 Method of detecting fluid influxes |
| 04/27/1993 | US5205165 Method for determining fluid influx or loss in drilling from floating rigs |
| 04/27/1993 | CA1316840C Method and system for degrading a foam fluid |
| 04/15/1993 | WO1993007358A1 Circulation equipment |
| 04/15/1993 | DE4133790A1 Process for sampling contaminated ground water from bore-holes - using a pressure activated filter pipe integrated with the drill pipe at a known level |
| 04/13/1993 | CA1316103C Diverter system test tool and method |
| 04/06/1993 | US5199997 Treatment of hydrocarbon-contaminated particulate materials |
| 04/06/1993 | US5199515 Dry pneumatic system for hard rock shaft drilling |
| 04/06/1993 | US5199509 Controlled gas trap system |
| 04/06/1993 | US5199501 Drilling or chiseling tool with suction apparatus |
| 04/01/1993 | WO1993006335A1 Method and apparatus for smoothing mud return fluctuations caused by platform heave |
| 04/01/1993 | WO1993006334A1 Apparatus and method for removing drillhole debris |
| 04/01/1993 | WO1993004257A3 Drilling pipe |
| 04/01/1993 | CA2119249A1 Apparatus and method for removing drillhole debris |
| 03/24/1993 | EP0533369A1 Temporarily held open casing filling valve |
| 03/23/1993 | US5195847 Process for cleaning drilling mud contaminated with hydrocarbons |
| 03/18/1993 | WO1993005366A2 Mass flow meter |
| 03/17/1993 | EP0531336A1 Double-tube core drill for inclined drilling. |
| 03/17/1993 | CN2128307Y Antifouling separator for well repair operation |
| 03/17/1993 | CA2078421A1 Automatic filling floating equipment |
| 03/09/1993 | US5191939 Casing circulator and method |
| 03/03/1993 | EP0516630A4 Process for recovery and treatment of a diverse waste stream |
| 03/03/1993 | CN2127741Y External magnetic tube magnetizer for drilling fluids |
| 03/02/1993 | US5191156 Drill string enclosure |
| 03/02/1993 | US5190114 Flow pulsing apparatus for drill string |
| 02/23/1993 | US5188190 Method for obtaining cores from a producing well |
| 02/23/1993 | CA1313863C Pore pressure formation evaluation while drilling |
| 02/18/1993 | WO1993004257A2 Drilling pipe |
| 02/18/1993 | CA2093138A1 Drill pipe |
| 02/16/1993 | US5186266 Multi-walled drill string for exploration-sampling drilling systems |
| 02/04/1993 | DE4208722A1 Bohr/schneidvorrichtung fuer beton oder dergleichen Drilling / cutting device for concrete or the like |
| 01/27/1993 | CN1068389A Processing method and storage structure for waste drilling fluid |
| 01/14/1993 | DE4121394A1 Injection method of underground mineral extraction - using drill string with injection head used as drill bit, and flushing up loosened material from deposit to top of drill string |
| 01/12/1993 | US5178223 Device for making a hole in the ground |
| 01/05/1993 | US5176211 Apparatus and method for recirculating mud when drilling under an obstacle |
| 12/29/1992 | US5174392 Mechanically actuated fluid control device for downhole fluid motor |
| 12/29/1992 | CA1312072C Downhole drilling assembly orienting device |
| 12/23/1992 | EP0519793A2 Device and installation for the cleaning of drain pipes, in particular in oil production wells |
| 12/22/1992 | CA1311681C Sand tool |
| 12/16/1992 | EP0517807A1 Process and apparatus for cleaning particulate solids |
| 12/15/1992 | CA1311370C Apparatus and method for measuring differential pressure while drilling |
| 12/10/1992 | WO1992021849A1 Drilling apparatus |
| 12/09/1992 | EP0516630A1 Process for recovery and treatment of a diverse waste stream |
| 12/08/1992 | US5168932 Detecting outflow or inflow of fluid in a wellbore |
| 12/08/1992 | CA2044011A1 Flushing and dredging method for wellbores and equipments therefor |
| 12/01/1992 | US5167283 Combination ball valve and annular pipe seal |
| 11/26/1992 | WO1992020898A1 A method and an arrangement for controlling the supply of air into a rock drilling machine |
| 11/25/1992 | CN1066457A Multifunctional well-drilling liquid treating agent and preparation method thereof |
| 11/24/1992 | US5165493 Mud saver valve |
| 11/24/1992 | US5165492 Apparatus for preventing separation of a down-hole motor from a drill string |
| 11/24/1992 | US5165477 Enzymatic decomposition of drilling mud |
| 11/19/1992 | EP0513899A1 Cleaning methods |
| 11/18/1992 | CN2122229U Multifunctional drilling liquid weighing treating apparatus |
| 11/12/1992 | WO1992019693A1 Use of selected oleophilic compounds with quaternary nitrogen to improve the oil wettability of finely divided clay and their use as viscosity promoters |
| 11/12/1992 | WO1992019561A1 A process for preparing products which require treating or drying of crushed stone materials |
| 11/12/1992 | DE4114906A1 Verwendung ausgewaehlter oleophiler verbindungen mit quartaerem stickstoff zur verbesserung der oelbenetzbarkeit feinteiliger tone und deren anwendung als viskositaetsbildner Use of selected oleophilic compounds with quaternary nitrogen for improved oil wettability of finely divided tone and their application as thickeners |
| 11/11/1992 | EP0512594A1 Suction valve for high pressure slurry pump |
| 11/11/1992 | EP0512331A1 Device for cleaning the well-bore-surrounding-zone |
| 11/11/1992 | CN2121532U Board type low-voltage magnetization device for drilling flnid |
| 11/11/1992 | CN1019036B Double-layer self-adjustable water distributor |
| 11/10/1992 | US5163029 Method for detection of influx gas into a marine riser of an oil or gas rig |
| 11/10/1992 | US5161409 Analysis of drilling solids samples |
| 11/10/1992 | CA1310144C Process for recovering barite from drilling muds |
| 11/03/1992 | US5160229 Mist-spouting type drilling device |