| 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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| 09/12/2001 | EP1131615A1 Method and system for extracting, analysing and measuring constituents transported by a bore fluid |
| 09/12/2001 | EP1131533A1 Tubular filling system |
| 09/12/2001 | CN2447517Y Drilling fluid feeding device |
| 09/07/2001 | WO2001065060A1 Improving reservoir communication with a wellbore |
| 09/07/2001 | WO2001065049A2 Cavitating jet |
| 09/06/2001 | US20010018976 Apparatus and method for cleaning well risers |
| 09/05/2001 | EP1128913A1 A screen for use in a shale shaker |
| 09/05/2001 | CN2446277Y Mud one-way circulating special valve for drilling rock |
| 09/04/2001 | US6283302 Unibody screen structure |
| 09/04/2001 | US6283230 Method and apparatus for lateral well drilling utilizing a rotating nozzle |
| 08/30/2001 | WO2001063087A1 Bore cleaning |
| 08/30/2001 | US20010017223 Non -cryogenic nitrogen for on-site downhole drilling and post drillingoperations |
| 08/30/2001 | US20010017210 Liner setting tool |
| 08/29/2001 | EP1128021A2 Solids-free viscous fluids |
| 08/29/2001 | EP1127477A1 Method and device in down-the-hole drilling |
| 08/28/2001 | US6279670 Downhole flow pulsing apparatus |
| 08/28/2001 | US6279669 Indexing mechanism and apparatus incorporating the same |
| 08/28/2001 | US6279657 Apparatus and method for circulating fluid in a well bore |
| 08/28/2001 | US6279654 Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 08/28/2001 | US6279471 Drilling fluid recovery defluidization system |
| 08/23/2001 | US20010015276 Wellbore flow control device |
| 08/22/2001 | EP1125036A1 Making up and breaking out of a tubing string in a well while maintaining continuous circulation |
| 08/21/2001 | US6276458 Apparatus and method for controlling fluid flow |
| 08/21/2001 | US6276455 Subsea gas separation system and method for offshore drilling |
| 08/21/2001 | US6276452 Apparatus for removal of milling debris |
| 08/21/2001 | US6276450 Apparatus and method for rapid replacement of upper blowout preventers |
| 08/21/2001 | CA2128337C Case cementing method and system |
| 08/16/2001 | US20010013428 Drilling system |
| 08/16/2001 | US20010013426 In-situ drilling system with dust collection and overload control |
| 08/15/2001 | CN1308705A Method and tool for fracturing an underground formation |
| 08/09/2001 | WO2001057356A1 Method and arrangement for reducing dust-related problems in rock drilling |
| 08/09/2001 | WO2001057353A2 Hard rock drilling device and method |
| 08/09/2001 | US20010011688 Drilling fluid mixing apparatus and methods |
| 08/09/2001 | US20010011589 Tubular filling system |
| 08/09/2001 | DE10004217A1 Verfahren und Vorrichtung zum Hartgesteinsbohren Method and apparatus for hard rock drilling |
| 08/08/2001 | EP1121508A1 Drilling method |
| 08/08/2001 | CN1069339C Lubricat composition and method for controlling lubricity of fluid |
| 08/07/2001 | US6269953 Vibratory separator screen assemblies |
| 08/07/2001 | CA2148061C Method for controlling fluid loss in high permeability formations |
| 08/01/2001 | EP1120542A2 Air drilling system and method for containing and separating cuttings |
| 07/31/2001 | US6267893 Process for cleaning fluids and particulate solids |
| 07/31/2001 | US6267716 Mixing cuttings produced during drilling operations comprising free hydrocarbons comprising bitumen with buffer solution to form emulsion; stabilization; adding encapsulating material water-soluble silicate to form silica shells around drops |
| 07/31/2001 | US6267247 Vibratory separator screen |
| 07/27/2001 | CA2330416A1 Air drilling system and method for containing and separating cuttings |
| 07/26/2001 | US20010009890 Invert emulsion drilling fluids and muds having negative alkalinity and elastomer compatibility |
| 07/25/2001 | CN1305046A Multiple air hammer device and trenching direction correcting method |
| 07/24/2001 | US6263987 One pass drilling and completion of extended reach lateral wellbores with drill bit attached to drill string to produce hydrocarbons from offshore platforms |
| 07/24/2001 | US6263982 Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling |
| 07/24/2001 | US6263981 Deepwater drill string shut-off valve system and method for controlling mud circulation |
| 07/24/2001 | US6263969 Bypass sub |
| 07/20/2001 | CA2331473A1 Fluid injection apparatus and method with controlled volume displacement for use in subterranean wells |
| 07/18/2001 | EP0822853B1 Shale shaker |
| 07/17/2001 | US6260616 Downhole flow control devices |
| 07/12/2001 | WO2001049972A1 Well kick detector |
| 07/12/2001 | WO2001049968A1 Combined power tong having integrated mud suction and thread doping apparatus |
| 07/12/2001 | DE10000013A1 Saugbohrer Piston sampler |
| 07/12/2001 | CA2393752A1 Combined power tong having integrated mud suction and thread doping apparatus |
| 07/11/2001 | EP1114116A1 Aphron-containing well drilling and servicing fluids of enhanced stability |
| 07/10/2001 | US6258859 Viscoelastic surfactant fluids and related methods of use |
| 07/10/2001 | US6257354 Drilling fluid flow monitoring system |
| 07/05/2001 | WO2001048351A2 Subsea well intervention vessel |
| 07/05/2001 | US20010006122 Suction tool |
| 07/05/2001 | US20010006120 Multiple air hammer apparatus and excavating direction correcting method therefor |
| 07/04/2001 | EP1112809A2 Drill with suction means |
| 07/04/2001 | EP0865564B1 Down hole bypass valve |
| 07/04/2001 | CN1301909A Adhesive method for vibrative sieve screen |
| 07/03/2001 | US6253861 Circulation tool |
| 07/03/2001 | US6253842 Wireless coiled tubing joint locator |
| 07/03/2001 | US6253787 Fluid flow and pressure control system and method |
| 07/03/2001 | CA2006009C Drilling fluids and muds containing selected ester oils |
| 06/28/2001 | WO2001045818A1 Process for breaking an emulsion |
| 06/28/2001 | WO2000079092A3 Drilling system |
| 06/27/2001 | EP1109609A1 Apparatus and method for handling waste |
| 06/27/2001 | CN1067738C Underground electromalgnetic flow meter |
| 06/26/2001 | US6251288 Methods of drilling a bore hole and dehydrating drilling fluids |
| 06/26/2001 | US6250388 Gas impulse device and method of use thereof |
| 06/26/2001 | US6250387 Apparatus for catching debris in a well-bore |
| 06/26/2001 | US6250383 Lubricator for underbalanced drilling |
| 06/21/2001 | WO2001044617A1 Flow actuated shut-off valve |
| 06/17/2001 | CA2300338A1 Apparatus for removing particles from a liquid |
| 06/14/2001 | WO2001042619A1 Apparatus and method for transferring oil and gas well drill cuttings |
| 06/12/2001 | US6244362 Weir box for drilling mud separation unit |
| 06/12/2001 | US6244359 Subsea diverter and rotating drilling head |
| 06/12/2001 | US6244342 Reverse-cementing method and apparatus |
| 06/07/2001 | WO2001040616A1 Controlling the flow of driving fluid to a system of multiple hydraulic motors |
| 06/07/2001 | WO2001039862A1 A method of making a screen, a screen, and a system for making a screen |
| 06/05/2001 | US6241032 One-way drill string clutch |
| 06/05/2001 | US6241030 Hydraulic underreamer and sections for use therein |
| 05/31/2001 | WO2001038648A1 Methods and means of carrying off contaminated materials |
| 05/29/2001 | US6237702 Hydraulic underreamer and sections for use thereof |
| 05/29/2001 | US6237701 Impulsive suction pulse generator for borehole |
| 05/29/2001 | US6237683 Wellbore flow control device |
| 05/25/2001 | WO2001036561A1 A method and apparatus for treating pressurized drilling fluid returns from a well |
| 05/24/2001 | US20010001429 Underbalanced well completion |
| 05/23/2001 | EP1101013A1 Reverse circulation drilling system with bit locked underreamer arms |
| 05/22/2001 | US6234258 Methods of separation of materials in an under-balanced drilling operation |
| 05/22/2001 | US6234030 Multiphase metering method for multiphase flow |
| 05/17/2001 | WO2001034266A1 Device and method for separation of liquid hazardous waste |
| 05/16/2001 | EP1082515A4 Offshore drilling system |
| 05/16/2001 | EP1071862A4 Rotating subsea diverter |