| 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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| 10/31/2013 | WO2012156742A3 Drilling apparatus and method |
| 10/31/2013 | US20130284519 Gravity Based Fluid Trap |
| 10/31/2013 | US20130284518 Method of using multi-component fibers as lost-circulation material |
| 10/30/2013 | EP2656004A1 Method for analyzing at least a cutting emerging from a well, and associated apparatus |
| 10/30/2013 | CN203257353U Novel pressure control drilled well system |
| 10/30/2013 | CN203257352U Filtering and backwashing device of high-pressure water injection well |
| 10/30/2013 | CN203257351U Orifice dust remover |
| 10/30/2013 | CN203257350U Test device for flushing effect of well cementation pre-flushing fluid |
| 10/30/2013 | CN203257349U Ocean module drill rig slurry backflow device |
| 10/30/2013 | CN103380259A In situ sampling and analysis system for a drill rig and a drill rig incorporating same |
| 10/30/2013 | CN102559154B Deoxidant for drilling fluid and preparation method for deoxidant |
| 10/30/2013 | CN102155173B Pulsed jet defoaming device |
| 10/29/2013 | US8567525 Method for determining fluid control events in a borehole using a dynamic annular pressure control system |
| 10/29/2013 | US8567519 Ground working device |
| 10/29/2013 | US8567504 Composition and method relating to the prevention and remediation of surfactant gel damage |
| 10/29/2013 | US8567503 Composition and method relating to the prevention and remediation of surfactant gel damage |
| 10/29/2013 | CA2752261C Complementary surfactant compositions and methods for making and using same |
| 10/29/2013 | CA2717774C Shaker deck adjustment apparatus |
| 10/24/2013 | WO2013159007A1 Systems and methods for injection and production from a single wellbore |
| 10/24/2013 | WO2013158997A1 A method and apparatus for solid-liquid separation of drilling fluids for analysis |
| 10/24/2013 | WO2013156667A1 Method and apparatus for down-the-hole drilling |
| 10/24/2013 | WO2013115651A3 Boost system and method for dual gradient drilling |
| 10/24/2013 | WO2012149418A3 Collapse sensing check valve |
| 10/24/2013 | US20130277119 Valve for communication of a measurement while drilling system |
| 10/24/2013 | US20130277113 Method and apparatus for solid-liquid separation of drilling fluids for analysis |
| 10/23/2013 | EP2652266A2 Method of determining reservoir pressure |
| 10/23/2013 | EP2652241A1 Downhole completion |
| 10/23/2013 | EP2652240A1 An inflow assembly |
| 10/23/2013 | CN103370599A Method for analyzing at least a cutting emerging from a well, and associated apparatus |
| 10/23/2013 | CN103362466A Liquid/gas double-medium continuous circular control system, implementation method and drilling system |
| 10/23/2013 | CN103362465A Mine compressed air self-negative-pressure orifice dust removing device |
| 10/22/2013 | US8561691 Method and apparatus for erosion control for use with flow control devices |
| 10/22/2013 | CA2737377C Polymer gels as flow improvers in water injection systems |
| 10/22/2013 | CA2686404C In-line treatment of hydrocarbon fluids with ozone |
| 10/22/2013 | CA2581242C Device for extracting at least one gas contained in a drilling mud and associated analysis assembly |
| 10/22/2013 | CA2576897C Sleeve arrangement |
| 10/20/2013 | CA2812601A1 Containment cellar |
| 10/17/2013 | WO2013155257A2 A downhole tool for use in a drill string |
| 10/17/2013 | WO2013155061A1 Triggered heating of wellbore fluids by carbon nanomaterials |
| 10/17/2013 | WO2013154535A1 Methods and apparatus for transmission of telemetry data |
| 10/17/2013 | WO2013017859A3 A downhole device for data acquisition during hydraulic fracturing operation and method thereof |
| 10/17/2013 | US20130270013 Flow restrictor and drilling assembly |
| 10/17/2013 | US20130270012 Aggregating compositions, modified particulate metal-oxides, modified formation surfaces, and methods for making and using same |
| 10/17/2013 | US20130269928 Downhole tool for use in a drill string |
| 10/16/2013 | EP2650467A1 Downhole deployment valves |
| 10/16/2013 | CN203239286U Impulse type steam distributing valve |
| 10/16/2013 | CN203239259U Faucet device of engineering drill |
| 10/16/2013 | CN203239258U Horizontal well continuous reverse circulation sand washing device |
| 10/16/2013 | CN203239257U Dustproof device for rock chiseling machine |
| 10/16/2013 | CN103352669A Recycling device of mud generated during well drilling and well repairing |
| 10/16/2013 | CN103352663A Drilling centralizer capable of removing rocks and debris beds at bottom of well |
| 10/16/2013 | CN103352659A Backpitch shattering and dust collecting drill bit |
| 10/15/2013 | US8556004 Bottom preventer for use in a drilling system |
| 10/15/2013 | US8555962 Downhole tool unit |
| 10/10/2013 | WO2013151534A1 Downhole circulating valve having a metal-to-metal seal and method for operating same |
| 10/10/2013 | WO2013106055A3 Esp thrust module with enhanced lubrication and temperature dissipation |
| 10/10/2013 | CA2773586A1 Solid settling tank |
| 10/09/2013 | CN103348096A Segmented collapsible ball seat allowing ball recovery |
| 10/09/2013 | CN103347598A Polymer blending system |
| 10/09/2013 | CN103343672A Clearing device and method for horizontal drilling cuttings bed of petroleum and gas drilling |
| 10/09/2013 | CN103343671A Small washpipe continuous sand washing tubular column |
| 10/08/2013 | US8550568 Collecting device and a method for using same |
| 10/08/2013 | US8550187 Drilling apparatus and method for working the ground |
| 10/08/2013 | CA2712580C Method and system of monitoring rotational time of rotatable equipment |
| 10/08/2013 | CA2698618C Variable position gas trap |
| 10/03/2013 | WO2013148005A1 Controlled full flow pressure pulser for measurement while drilling (mwd) device |
| 10/03/2013 | US20130256037 Drill Cuttings Conveyance Systems |
| 10/03/2013 | US20130255369 High pressure fracture tester |
| 10/02/2013 | EP2643548A2 Eccentric safety valve |
| 10/02/2013 | EP2643541A1 Submersible progressive cavity pump driver |
| 10/02/2013 | CN203223196U Mine air water slag packing and separating device |
| 10/02/2013 | CN203223195U Gas drilling anti-dust device |
| 10/02/2013 | CN203223194U Air drilling reduction gear |
| 10/02/2013 | CN103334709A Casing pipe annular gas injection technology |
| 10/02/2013 | CN103334699A Coal mine underground coal bed drilling and cave-building device and method of use |
| 10/02/2013 | CA2810816A1 Drill cuttings conveyance systems |
| 10/01/2013 | US8544565 Lost circulation control fluids for naturally fractured carbonate formations |
| 10/01/2013 | CA2780351C Flow operated orienter |
| 10/01/2013 | CA2728072C Apparatus for cleaning boreholes within substrates |
| 09/26/2013 | WO2013142017A1 One trip tubular cleaning and drilling additional open hole |
| 09/26/2013 | WO2013141963A2 Mathematical modeling of shale swelling in water based muds |
| 09/26/2013 | WO2012149433A3 Annular relief valve |
| 09/25/2013 | EP2640931A2 Method of and apparatus for drilling a subterranean borehole |
| 09/25/2013 | EP2640927A2 Drilling method for drilling a subterranean borehole |
| 09/25/2013 | EP2640922A1 Method, system and rock drilling apparatus for installing a pipe in drilled holes in rock drilling |
| 09/25/2013 | CN203214000U Small-diameter polymer flooding packer |
| 09/25/2013 | CN203213999U High-pressure water injection packer |
| 09/25/2013 | CN203213987U Cast-in-place pile mud processing equipment with functions of mud making and remote slag discharge |
| 09/25/2013 | CN203213986U Novel dustproof drilling rig for opencast coal mine |
| 09/25/2013 | CN203213985U Dust collecting bag for through-type downhole hammer reverse circulation drill |
| 09/25/2013 | CN103320099A Petroleum drilling fluid viscosity reducing agent as well as preparation method and application method thereof |
| 09/25/2013 | CN102155150B Crushing mechanism with gas inlet pipe |
| 09/24/2013 | CA2721809C Vibratory separator motion |
| 09/24/2013 | CA2608292C Device and method for retrieving debris from a well |
| 09/24/2013 | CA2568593C Method and apparatus for performing chemical treatments of exposed geological formations |
| 09/24/2013 | CA2540560C Solid-liquid separation of oil-based muds |
| 09/19/2013 | US20130240267 Method for continuous formation core sampling |
| 09/19/2013 | CA2858228A1 Fluid handling and containment system, apparatus and method |
| 09/19/2013 | CA2771477A1 Fluid handling and containment system, apparatus and method |
| 09/18/2013 | EP2638232A1 Method and device for establishing a borehole in the seabed |