| 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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| 01/01/2014 | CN103485738A Horizontal well rock debris transportation simulation experiment set and experiment method |
| 01/01/2014 | CN103485737A Electric drive skid-mounted well flushing device |
| 01/01/2014 | CN103485730A Uninterrupted air drilling circulating nipple |
| 01/01/2014 | CN103485721A High-low-pressure hydraulic hole flushing switcher |
| 01/01/2014 | CN103480181A Multi-vane anisotropic turbulent flow type low-pressure and self-balancing slurry degassing device |
| 12/31/2013 | US8616284 Methods for removing residual polymer from a hydraulic fracture |
| 12/31/2013 | CA2723856C Compositions and methods for the removal of oil-based filtercakes |
| 12/31/2013 | CA2526998C Method of decreasing the disintegration of shale-containing cuttings and drilling fluid therefor |
| 12/27/2013 | WO2013192518A1 High temperature supercapacitor |
| 12/27/2013 | WO2013192365A1 Detecting a drill string washout event |
| 12/27/2013 | WO2013191838A1 Directional drilling system |
| 12/27/2013 | WO2013191695A1 Viscoelastic surfactants in mixed brines |
| 12/27/2013 | WO2013191694A1 Delayed enhancement or breaking of viscosity for viscoelastic surfactant containing wellbore fluids |
| 12/27/2013 | WO2013191559A1 Arrangement for continuous circulation of drilling fluid during drilling operations |
| 12/27/2013 | WO2013141963A3 Mathematical modeling of shale swelling in water based muds |
| 12/27/2013 | CA2877115A1 Arrangement for continuous circulation of drilling fluid during drilling operations |
| 12/27/2013 | CA2876895A1 Detecting a drill string washout event |
| 12/27/2013 | CA2876589A1 Viscoelastic surfactants in mixed brines |
| 12/27/2013 | CA2876310A1 Delayed enhancement or breaking of viscosity for viscoelastic surfactant containing wellbore fluids |
| 12/27/2013 | CA2814893A1 Hydraulic pulse valve with improved pulse control |
| 12/26/2013 | US20130341028 Controllably tuning properties of a fluid using modified nanoparticles |
| 12/26/2013 | US20130340997 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 12/26/2013 | US20130340791 Method and Device for Cleaning Drill Cuttings |
| 12/25/2013 | EP2675987A1 Low headroom confined space geoexchange drilling system and method |
| 12/25/2013 | EP2675982A1 Method and apparatus for down-the-hole drilling |
| 12/25/2013 | EP2675579A2 Enhanced system for sand cleaning in a hydrocyclone |
| 12/25/2013 | CN203362074U Improved pressure release manifold device of foam drilling |
| 12/25/2013 | CN203362073U Prying well washing device control system |
| 12/25/2013 | CN203362072U Mud recycling device used during well drilling and repairing |
| 12/25/2013 | CN203362071U Mechanical tractor pumping set |
| 12/25/2013 | CN203362070U Rock debris observation device for gas drilling |
| 12/25/2013 | CN203362035U Air drilling high-and-low pressure conversion manifold device |
| 12/25/2013 | CN203359425U Drilling fluid solid particle conveyor and conveying device |
| 12/25/2013 | CN103477021A Selectively variable flow restrictor for use in a subterranean well |
| 12/25/2013 | CN103470202A Online integrated monitoring and warning method for overflow in drilling process of oil and gas wells |
| 12/25/2013 | CN103470201A Fluid control system |
| 12/25/2013 | CN103470200A Two-stage desanding sand cleaning fluid disposal vehicle |
| 12/25/2013 | CN103470199A Reversing slide sleeve, sand washing operation device and sand washing operation method adopting same |
| 12/25/2013 | CN102373880B Power water tap |
| 12/25/2013 | CN102352731B Downhole tubular column lifting device capable of transmitting torque in whole course |
| 12/25/2013 | CN102094578B Drilling mechanism |
| 12/25/2013 | CN102084085B Wellbore system |
| 12/25/2013 | CN101925719B Breaker fluids and methods of using same |
| 12/24/2013 | US8613329 Method and apparatus for efficient handling of drill cuttings |
| 12/24/2013 | CA2606899C Flow through subassembly for a downhole drill string and method for making same |
| 12/19/2013 | WO2013188124A1 Methods for predicting dynamic sag using viscometer/rheometer data |
| 12/19/2013 | WO2013117208A3 Lubricant supply of a bore for laying a pipeline |
| 12/19/2013 | US20130333893 Submersible Progressive Cavity Pump Driver |
| 12/18/2013 | CN203347738U Anti-blocking large channel backwashing packer |
| 12/18/2013 | CN203347716U Dust collection device for mining outdoor down-the-hole drill |
| 12/18/2013 | CN203347715U Water filtering hole flusher |
| 12/18/2013 | CN203347714U Horizontal well reverse circulation rotational flow sand washing device |
| 12/18/2013 | CN103459756A Gravity based fluid trap |
| 12/18/2013 | CN103459755A Automatic standpipe pressure control in drilling |
| 12/18/2013 | CN103452531A Method for underbalanced tubing descending, non-well-killing gas lifting, rotary pumping, pump maintaining and tubing maintaining |
| 12/18/2013 | CN103452508A Method and device for constructing bedding gas extraction long drilled holes of soft coal seams |
| 12/18/2013 | CN103452507A Air and water linkage device of hydraulic rock drilling machine |
| 12/18/2013 | CN103452506A Defoaming device and method for coal-mine foam drilling |
| 12/18/2013 | CN103452476A A rock drilling rig and method of driving compressor |
| 12/18/2013 | CN103452472A Slurry pumping type well drilling device and well drilling method |
| 12/18/2013 | CN103446802A Drilling fluid skimming tank |
| 12/17/2013 | US8607894 Offshore thermal treatment of drill cuttings fed from a bulk transfer system |
| 12/12/2013 | WO2013184100A1 Methods and systems for performance of subterranean operations using dual string pipes |
| 12/12/2013 | WO2013077905A3 Systems and methods for continuous and near continuous drilling |
| 12/12/2013 | US20130331301 Methods for using complementary surfactant compositions |
| 12/12/2013 | US20130327531 Viscoelastic Surfactant Fluids and Related Methods of Use |
| 12/12/2013 | CA2875974A1 Flow control system |
| 12/11/2013 | EP2672058A2 Method and device for sealing the ends of drilling rod elements |
| 12/11/2013 | EP2670945A2 Segmented collapsible ball seat allowing ball recovery |
| 12/11/2013 | CN203334999U Atomization generator for gallery drilling |
| 12/11/2013 | CN203334998U Pressure transmission pin-pulled fracture-type automatic grouting valve floating valve |
| 12/11/2013 | CN203334997U Propping-type automatic grouting trapdoor-type float valve |
| 12/11/2013 | CN203334996U Valve float valve achieving automatic grouting through tensile fracture of pin bolt |
| 12/11/2013 | CN203334995U Pile foundation hole cleaning and sand screening device |
| 12/11/2013 | CN203334994U Discharging quantity accurate metering and small-pipe-diameter grouting device |
| 12/11/2013 | CN203334993U Sand removal converter |
| 12/11/2013 | CN203334958U Novel coal bed hydraulic broaching safety protection device |
| 12/11/2013 | CN103437730A Bypass valve with anti-dropping structure |
| 12/11/2013 | CN103437729A By-pass valve with limiting structure |
| 12/11/2013 | CN103437728A Bypass valve for screw drill rod |
| 12/11/2013 | CN103437727A Bypass valve good in sealing performance |
| 12/11/2013 | CN103437726A Oil and gas drilling blowout device and method |
| 12/11/2013 | CN103437706A Power head structure for horizontal directional drilling machine |
| 12/11/2013 | CN102606070B Combined drilling technique of vegetable gum diamond coring and downhole hammer casing drilling |
| 12/10/2013 | US8602128 Analysis of drilling cuttings for permittivity |
| 12/10/2013 | CA2562819C Methods and systems for delivering lost circulation material into drilling pits |
| 12/10/2013 | CA2522864C Device for preparing a fluid, in particular a drilling fluid, process for preparing it and all of the related analyses |
| 12/10/2013 | CA2502598C Openhole perforating |
| 12/05/2013 | WO2013181490A1 Surface active additives for oil-based mud filter cake breakers |
| 12/05/2013 | WO2013181284A1 System for containment, measurement, and reuse of fluids in hydraulic fracturing |
| 12/05/2013 | WO2013178295A1 Apparatus and method for controlling pressure in a borehole |
| 12/05/2013 | WO2012101418A3 Screen assembly and a method for making same |
| 12/05/2013 | US20130319767 Telemetry operated circulation sub |
| 12/05/2013 | US20130319765 Rock drilling rig and method of driving compressor |
| 12/05/2013 | US20130319660 System for Containment, Measurement, and Reuse of Fluids in Hydraulic Fracturing |
| 12/05/2013 | CA2875125A1 Apparatus and method for controlling pressure in a borehole |
| 12/05/2013 | CA2874982A1 System for containment, measurement, and reuse of fluids in hydraulic fracturing |
| 12/04/2013 | EP2669469A2 Drilling components and systems to dynamically control drilling dysfunctions |
| 12/04/2013 | EP2669463A1 A rock drilling rig and method of driving compressor |
| 12/04/2013 | EP2668365A2 Check valve |