| 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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| 02/05/2009 | US20090032247 Eductor Jet Bushing for Downhole Use |
| 02/05/2009 | CA2809159A1 Continuous flow drilling systems and methods |
| 02/05/2009 | CA2809156A1 Continuous flow drilling systems and methods |
| 02/05/2009 | CA2695281A1 Method for removing oil from oil-contaminated material |
| 02/05/2009 | CA2694655A1 Reclamation of formate brines |
| 02/05/2009 | CA2694482A1 Continuous flow drilling systems and methods |
| 02/05/2009 | CA2693250A1 Sealing arrangement and corresponding method |
| 02/04/2009 | CN201190540Y Air-water dual-purpose inserting outburst-prevention drill rod |
| 02/04/2009 | CN100458100C Method for measuring downhole pressure in the course of drilling operation and its equipment |
| 02/03/2009 | US7485602 Drilling method using isomerized olefins and paraffin hydrocarbons as base oils for invert emulsion oil muds |
| 02/03/2009 | US7484574 Drill cuttings conveyance systems and methods |
| 02/03/2009 | US7484559 Method for drilling and casing a wellbore with a pump down cement float |
| 02/03/2009 | CA2497314C Method and apparatus for removing cuttings |
| 02/03/2009 | CA2374709C Method and apparatus for displacing drilling fluids with completion and workover fluids, and for cleaning tubular members |
| 02/02/2009 | WO2009018539A2 Application of microturbines to control emissions from associated gas |
| 01/29/2009 | WO2009015184A2 Feed hopper for positive displacement pumps |
| 01/29/2009 | WO2008139139A3 Dust control system for transferring dry material used in subterranean wells |
| 01/29/2009 | US20090025927 Wellbore cleaning method & apparatus |
| 01/28/2009 | EP1971636A4 Water absorbing polymers for treatment of brines and water-based drilling fluids |
| 01/28/2009 | CN101353951A Pile bottom hole clearing system and process of pile bottom hole clearing |
| 01/27/2009 | US7482310 preparing a fracturing fluid containing water-in oil emulsion of homo or copolymer of acrylamide, hydrophobic oil phase (mineral oil, paraffinc oil) a surfactant e.g. polyoxyethylene derivatives of sorbitan esters; solvent ( ethylene carbonate), inorganic microparticles, silica; contacting formations |
| 01/27/2009 | US7482309 Methods of drilling wellbores using variable density fluids comprising coated elastic particles |
| 01/27/2009 | CA2592918C System and method for bleeding off pressure following servicing of a well |
| 01/27/2009 | CA2548458C Hydraulically releaseable inflation tool for permanent bridge plug |
| 01/27/2009 | CA2506917C Drilling fluid circulation system and method |
| 01/27/2009 | CA2500163C Cementing through a side pocket mandrel |
| 01/27/2009 | CA2322304C Apparatus and method for recycling drilling slurry |
| 01/22/2009 | US20090023618 Method for recovering crude oil from a subterranean formation |
| 01/22/2009 | US20090020336 Drilling fluid flow facilitation |
| 01/22/2009 | CA2693246A1 Preparing a hydratable polymer concentrate for well treatment applications |
| 01/22/2009 | CA2693099A1 Method and device for cleaning and sealing a well |
| 01/21/2009 | EP2016254A1 Downhole swivel apparatus and method |
| 01/21/2009 | EP1792042B1 Method and apparatus for remediating drill cuttings |
| 01/21/2009 | CN201184150Y Self-rotating spray head for continues oil pipe |
| 01/21/2009 | CN201184149Y Deposition crumbs-proof drilling tool |
| 01/21/2009 | CN201184148Y High-pressure well washing apparatus |
| 01/20/2009 | CA2469719C Composition for use in sealing a porous subterranean formation, and methods of making and using |
| 01/15/2009 | WO2009006731A1 Drilling fluid additive for reducing lost circulation in a drilling operation |
| 01/15/2009 | US20090014071 Mud saver valve with magnetic latching |
| 01/14/2009 | CN201180507Y Liquor drainage mechanism of drilling fluid 4-phase separator |
| 01/14/2009 | CN201180497Y Single tube all-directional drilling injection slip casting drilling bit of auxiliary slip casting hole capable of hydraulic controlling open-and-close |
| 01/14/2009 | CN201180492Y Buffering mechanism of chip removal pipe for gas drilling |
| 01/14/2009 | CN201180489Y Double-power electrohydraulic mechanical transmission workover rig |
| 01/14/2009 | CN101343987A Drilling fluid cleaning system device |
| 01/14/2009 | CN101343984A Cement pipe assembly used for ocean drill platform |
| 01/13/2009 | US7475732 Instrumentation for a downhole deployment valve |
| 01/13/2009 | CA2376298C Method and apparatus for homogenizing drilling fluid in an open-loop process |
| 01/08/2009 | US20090008083 Method and apparatus for wellbore fluid treatment |
| 01/07/2009 | EP2010750A1 Method of controlling operation of rock drilling rig, and rock drilling rig |
| 01/07/2009 | CN201176871Y All-hydraulic type rock core boring machine hydraulic control system |
| 01/07/2009 | CN101338658A Hermetic electric submersible pump production completion system capable of proceeding steel wire operation |
| 01/07/2009 | CN101338652A Method and device for executing cleaning operation for well |
| 01/06/2009 | US7474969 Method and system for production metering of oil wells |
| 01/06/2009 | US7472753 Cementing system for wellbores |
| 12/31/2008 | WO2009000068A1 Drilling fluid additive and method for improving lubricity or increasing rate of penetration in a drilling operation |
| 12/31/2008 | EP2007967A2 A system and method for estimating supercharge pressure and initial pressure of a formation |
| 12/31/2008 | EP2007840A1 Methods of preparing hydrocarbon, water and organophilic clay emulsions and compositions thereof |
| 12/31/2008 | CN201173097Y Boring mud deposition cartridge |
| 12/31/2008 | CN101333916A Closed well washing device |
| 12/31/2008 | CN100447372C Shallow drill assembly with separate jet pump |
| 12/31/2008 | CA2692081A1 Drilling fluid additive and method for improving lubricity or increasing rate of penetration in a drilling operation |
| 12/30/2008 | CA2297185C Fluids containing viscoelastic surfactant and methods for using the same |
| 12/25/2008 | US20080314596 Apparatus and method for wellbore isolation |
| 12/25/2008 | US20080314415 Cleaning Contaminated Materials |
| 12/24/2008 | WO2008156376A1 Device and method for maintaining constant pressure on, and flow drill fluid, in a drill string |
| 12/24/2008 | WO2008155654A2 Hydrocarbon recovery drill string apparatus, subterranean hydrocarbon recovery drilling methods, and subterranean hydrocarbon recovery methods |
| 12/24/2008 | WO2008155578A1 Flow restrictor coupling |
| 12/24/2008 | WO2008132440A3 Method for blending fracturing gel |
| 12/24/2008 | EP2004950A1 Separator and process for removing solids from drilling liquids |
| 12/24/2008 | CN201170069Y Seal glue core loading and unloading tools of sea drill platform current divider |
| 12/24/2008 | CN201170067Y Seal glue core assembly of sea drill platform current divider |
| 12/24/2008 | CN201170066Y External glue core assembly of sea drill platform current divider |
| 12/24/2008 | CN201170065Y Seal assembly of sea drill platform current divider |
| 12/24/2008 | CN101328786A Automatic grouting control method and control system of well drilling |
| 12/24/2008 | CN101328709A Borehole cleaning method and apparatus for fast reverse circulation by using high pressure air |
| 12/24/2008 | CA2692233A1 Flow restrictor coupling |
| 12/24/2008 | CA2691768A1 Device and method for maintaining constant pressure on, and flow drill fluid, in a drill string |
| 12/23/2008 | US7468343 alkylxylene moiety in the alkylxylene sulfonate contains a high percentage of the 4-alkyl-1,2-dimethyl benzene isomer and attachment of the alkyl group to the xylene ring at positions higher than the 2-position on the alkyl carbon chain; for enhancing the recovery of oil from a subterranean reservoir |
| 12/23/2008 | US7467674 Rock drilling equipment |
| 12/23/2008 | CA2455143C Fluid collecting device |
| 12/18/2008 | WO2008153410A1 A collector device for drilling fluid |
| 12/18/2008 | WO2008151447A1 Well service compositions for consolidation of particulates in subterranean coal seams |
| 12/18/2008 | CA2691315A1 A collector device for drilling fluid |
| 12/18/2008 | CA2690253A1 Well service compositions for consolidation of particulates in subterranean coal seams |
| 12/17/2008 | EP2003287A2 Casing data relay |
| 12/17/2008 | EP1778813A4 Under-neutralized alkylxylene sulfonic acid composition for enhanced oil recovery processes |
| 12/16/2008 | US7465426 comprises a tank, feeders, extractors, analyzer; extractors comprise an ultrasonic electroacoustic transducer and the mud feeders comprise volume and flow rate regulators that enable a preset constant volume of mud to be guaranteed in the tank and the flow rate to be adjusted to a preset constant value |
| 12/16/2008 | US7464770 Closed-loop control of hydraulic pressure in a downhole steering tool |
| 12/16/2008 | US7464758 Model HCCV hydrostatic closed circulation valve |
| 12/16/2008 | CA2392331C Subsea well intervention vessel |
| 12/11/2008 | WO2008149063A1 Apparatus and method for improvements in wellbore drilling |
| 12/11/2008 | WO2008148412A1 Pump apparatus and method for testing a water-carrying test horizon |
| 12/11/2008 | US20080302570 Dual Gradient Drilling Method And Apparatus With An Adjustable Centrifuge |
| 12/11/2008 | US20080302569 Dual Gradient Drilling Method And Apparatus With An Adjustable Centrifuge |
| 12/10/2008 | EP1999225A1 Methods of treating wellbores with recyclable fluids |
| 12/10/2008 | CN201162505Y Concrete deep borehole air pressure type hole clearing device |
| 12/10/2008 | CN201162504Y Frame type slurry vibration screen mesh for petroleum |
| 12/09/2008 | US7462580 Ecological compatibility, stability, performance; invert emulsion having flat rheology over wide temperature range; operating without fluid loss |
| 12/09/2008 | CA2500704C Mono-trip well completion |
| 12/09/2008 | CA2407459C Invert emulsion drilling fluid and process |