| 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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| 09/26/1989 | CA1261817A1 Earth drilling method and apparatus using multiple hydraulic forces |
| 09/26/1989 | CA1261608A1 Water-based metal-containing organic phosphate compositions |
| 09/26/1989 | CA1260922A1 Air pressure impact drilling method and apparatus for same |
| 09/26/1989 | CA1260458A1 Annular air-hammer apparatus for drilling holes |
| 09/26/1989 | CA1260454A1 Annular air-hammer apparatus for drilling holes |
| 09/21/1989 | WO1989008487A1 Process for treatment of drilling mud |
| 09/20/1989 | EP0333484A2 Flow pulsing apparatus for down-hole drilling equipment |
| 09/20/1989 | CN2044638U Underground circulation connector |
| 09/19/1989 | US4867256 Injection of polymer chemicals into drilling mud |
| 09/19/1989 | US4867254 Method of controlling fluid influxes in hydrocarbon wells |
| 09/13/1989 | EP0331978A2 Drill pipe for a hydraulic down-hole drill hammer |
| 09/13/1989 | EP0331842A1 Process and apparatus for recovery of oil |
| 09/12/1989 | US4865128 Gravel packing system for a production radial tube |
| 09/12/1989 | CA1259166A1 Process for drilling geothermal wells with removal of h.sub.2s |
| 09/07/1989 | DE3806407A1 Arrangement for producing soil sections compacted with the addition of binding or sealing agents |
| 09/06/1989 | CN1035339A Pressurized water-filling method for well and its equipment |
| 09/05/1989 | US4863980 Adduct of polysaccharides and phosphatides |
| 08/24/1989 | DE3828481A1 Vorrichtung zum einzementieren eines gehaeusestranges in einem bohrloch Apparatus for Cement in a gehaeusestranges in a borehole |
| 08/23/1989 | CN2043268U Concentric air lift reverse cyclic system of drilling machine |
| 08/23/1989 | CN1034974A Stabilizer for drill stem |
| 08/17/1989 | DE3803708A1 Assembly device for percussion drilling machines |
| 08/16/1989 | EP0327575A1 A pneumatic percussion hammer |
| 08/16/1989 | CN1034780A Flushing liquid for oil-based mud |
| 08/15/1989 | US4857175 Centrifugal debris catcher |
| 08/10/1989 | DE3901921A1 Rodless multi-hole drilling and cutting unit |
| 08/01/1989 | US4853465 Organophilic polyphenolic acid adducts |
| 08/01/1989 | US4852672 Drill apparatus having a primary drill and a pilot drill |
| 08/01/1989 | US4852667 Pressure relief process for well-drilling |
| 07/26/1989 | EP0324870A1 Self-steering drill string pipe for rotating drill strings of rock drilling machines |
| 07/26/1989 | CN1004895B Telecontrolled operating device |
| 07/25/1989 | US4850702 Method of blending materials |
| 07/25/1989 | US4850440 Method and device for making a hole in the ground |
| 07/18/1989 | CA1257701A1 Method of avoiding stuck drilling equipment |
| 07/12/1989 | CN1033858A Method and apparatus for automatically pouring mud during pulling out the drill |
| 07/11/1989 | US4846271 Adjustable mechanism for stabbing and threading a drill pipe safety valve |
| 07/11/1989 | US4845981 System for monitoring fluids during well stimulation processes |
| 07/06/1989 | DE3742572A1 Drilling and cutting medium for rock |
| 07/06/1989 | DE3740367C1 Seat ring for ball cocks mounted in a floating manner, having a sealing element which blocks on one side |
| 07/05/1989 | CN2040531U Mud cleaner for drilling well |
| 07/04/1989 | US4844182 Method for improving drill cuttings transport from a wellbore |
| 06/28/1989 | EP0322170A2 Earth boring apparatus with control valve |
| 06/28/1989 | CN2040139U Mud heavy-making agent an vibrating screen for recovering mud liquid |
| 06/27/1989 | US4843048 Organophilic clay compositions |
| 06/27/1989 | US4842066 Method for isolation of intake beds in drill holes and a device for carrying same into effect |
| 06/20/1989 | US4840238 Superposed drilling device |
| 06/20/1989 | US4840234 Pneumatic ram boring machine |
| 06/20/1989 | US4840061 Method of detecting a fluid influx which could lead to a blow-out during the drilling of a borehole |
| 06/14/1989 | EP0320039A1 Apparatus for measuring differential pressure while drilling |
| 06/14/1989 | EP0319942A2 Salts and amine of at least partially perfluorinated amino- and/or amidocarboxylic acids and their use |
| 06/14/1989 | EP0213192B1 Marine riser fill-up valve |
| 06/13/1989 | US4839022 Method and apparatus for treating oil-water-solids sludges and refinery waste streams |
| 06/08/1989 | DE3740368A1 Seat ring seal for ball valves |
| 06/07/1989 | EP0318472A1 Enhanced circulation drill bit |
| 06/06/1989 | US4836611 Method and apparatus for drilling and separating |
| 06/06/1989 | US4836305 Drill pipes and casings utilizing multi-conduit tubulars |
| 06/06/1989 | US4836302 Apparatus and method for removing and recovering oil and/or other oil-based drilling mud additives from drill cuttings |
| 05/31/1989 | CN2038542U Device for prolonging service life of vibration sieve screen |
| 05/30/1989 | US4834193 Earth boring apparatus and method with control valve |
| 05/30/1989 | US4833914 Pore pressure formation evaluation while drilling |
| 05/24/1989 | EP0316985A1 A method of monitoring the drilling operations by analysing the circulating drilling mud |
| 05/24/1989 | EP0174972B1 Hammer for use in a bore hole and apparatus for use therewith |
| 05/23/1989 | US4832126 Diverter system and blowout preventer |
| 05/16/1989 | US4830122 Flow pulsing apparatus with axially movable valve |
| 05/09/1989 | US4828052 Ultrasonic drilling apparatus |
| 05/09/1989 | US4828024 Diverter system and blowout preventer |
| 05/09/1989 | CA1253845A1 Oil well safety valve for use with drill pipe |
| 05/02/1989 | US4825947 Apparatus for use in cementing a casing string within a well bore |
| 05/02/1989 | US4825902 Flapper valve with protective hinge pin sleeve |
| 04/25/1989 | US4823890 For having pressurized fluid flow inwardly |
| 04/25/1989 | US4823877 Open hole pipe recovery circulation valve |
| 04/18/1989 | US4821817 Actuator for an appliance associated with a ducted body, especially a drill rod |
| 04/11/1989 | US4819746 Reverse circulation down-the-hole hammer drill and bit therefor |
| 04/11/1989 | US4819745 Flow pulsing apparatus for use in drill string |
| 04/11/1989 | CA1252456A1 Means and device for prudent penetration of a casing through sensible overburden or sensible structures |
| 04/06/1989 | WO1989002774A1 Apparatus and method for removing and recovering oil and/or other oil-based drilling mud additives from drill cuttings |
| 04/04/1989 | US4817739 Drilling enhancement tool |
| 04/04/1989 | US4817724 Diverter system test tool and method |
| 03/28/1989 | US4816077 Process for the preparation of an aqueous solution of a heteropolysaccharide |
| 03/28/1989 | US4815546 Top head drive assembly with axially movable quill |
| 03/22/1989 | EP0308083A2 Device for sampling soils and retaining volatiles therein and method of using same |
| 03/21/1989 | US4813495 Method and apparatus for deepwater drilling |
| 03/21/1989 | US4813493 Hydraulic top drive for wells |
| 03/15/1989 | EP0162074B1 Liquid recovery unit |
| 03/14/1989 | US4811799 Banjo box and blooie line spool |
| 03/14/1989 | US4811798 Drilling motor deviation tool |
| 03/14/1989 | US4811758 Pressurized check valve |
| 03/07/1989 | US4809791 Removal of rock cuttings while drilling utilizing an automatically adjustable shaker system |
| 03/07/1989 | US4809790 Device for sampling soils and retaining volatiles therein and method of using same |
| 03/01/1989 | CN2033439U 泡沫发生器 Foam generator |
| 02/28/1989 | US4807469 Monitoring drilling mud circulation |
| 02/22/1989 | CN2033049U High-pressure water meter central detecting meter |
| 02/22/1989 | CN2033048U Instrument testing three performance of well drilling liquid |
| 02/21/1989 | US4805449 Apparatus and method for measuring differential pressure while drilling |
| 02/16/1989 | DE3726014A1 High-pressure deep-hole hammer drill, for example for injection holes |
| 02/15/1989 | CN1031123A Drill pipes and castings utilizing mult-conduit tubulars |
| 02/14/1989 | US4804461 Alkyl phosphate based collecting and foaming reagent |
| 02/08/1989 | EP0302632A1 Drill pipes and casings utilizing multi-conduit tubulars |
| 02/08/1989 | EP0302558A1 Method of analysing fluid influxes in hydrocarbon wells |
| 02/08/1989 | EP0302557A1 Method of controlling fluid influxes in hydrocarbon wells |
| 02/07/1989 | USH573 Sealing of pits |