| 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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| 01/30/2013 | CN102906367A Systems and methods for drying drill cuttings |
| 01/30/2013 | CN102902230A Automatic control system used in defoaming device |
| 01/30/2013 | CN102901341A Vertical rock debris drying machine driven by variable frequency motor |
| 01/30/2013 | CN102900394A Packer capable of washing well and examining seal |
| 01/30/2013 | CN102900388A Device for recycling waste drilling liquid |
| 01/30/2013 | CN102900357A Rotary drilling rig and brine collecting method |
| 01/30/2013 | CN102071926B Method and device for measuring full-hole annular pressure and method and device for controlling same |
| 01/30/2013 | CN101600849B High density slurry |
| 01/29/2013 | US8362093 Enhanced slurrification method |
| 01/29/2013 | US8360170 Method of drilling a subterranean borehole |
| 01/29/2013 | CA2701834C Fluid distribution for a shaker |
| 01/29/2013 | CA2523472C Well treating method to prevent or cure lost-circulation |
| 01/24/2013 | WO2012149345A3 Drilling waste treatment |
| 01/24/2013 | WO2011149806A3 Method for circulating a fluid entry entry out of a subsurface wellbore without shutting in the wellbore |
| 01/23/2013 | EP2547857A1 Casing fill-up fluid management tool |
| 01/23/2013 | CN202689981U Fluid impacting type mechanical defoamer for foam drilling |
| 01/23/2013 | CN202689980U Drilling de-dusting device |
| 01/23/2013 | CN202689979U Multi-directional jet flow sand washing device |
| 01/23/2013 | CN202689978U Tool for flushing drilling template |
| 01/23/2013 | CN202689977U Cavitation negative pressure flowback device |
| 01/23/2013 | CN202689924U Drilling device of bottom plate of coal mine tunnel |
| 01/23/2013 | CN102889073A Device and method for monitoring drilling working state of drilling machine |
| 01/23/2013 | CN102888837A Method for constructing end-bearing pile on consequent bedding rock slope |
| 01/23/2013 | CN101824964B Downhole drill of intelligent underground multi-branch horizontal drilling completion system |
| 01/22/2013 | CA2711780C Apparatus and method for separating solids from a solids laden fluid |
| 01/22/2013 | CA2707257C Emulsifier blend |
| 01/22/2013 | CA2656619C Method for improved well control with a downhole device |
| 01/22/2013 | CA2525331C Pneumatic ground piercing tool |
| 01/17/2013 | WO2013009694A2 Downhole polymer foam applications |
| 01/17/2013 | WO2013009628A2 Compound angle wedge screen clamp for vibratory separator |
| 01/17/2013 | WO2013009567A2 An apparatus, system and method for injecting a fluid into a formation downhole |
| 01/17/2013 | WO2012149007A3 Functionally gradient composite article |
| 01/17/2013 | WO2012010480A3 Drill pipe |
| 01/17/2013 | US20130014950 Methods of Well Cleanout, Stimulation and Remediation and Thermal Convertor Assembly for Accomplishing Same |
| 01/16/2013 | EP2545245A2 Dual ball upper internal blow out preventer valve |
| 01/16/2013 | EP2545244A2 System and method for separating solids from fluids |
| 01/16/2013 | EP2544799A2 System and method for separating solids from fluids |
| 01/16/2013 | CN202673210U High-pressure mud testing device and high-pressure mud testing system |
| 01/16/2013 | CN202673209U Downhole operation inverse well-flushing device |
| 01/16/2013 | CN202673208U Mining surface drilling dust-extraction device |
| 01/16/2013 | CN202673207U Sectioned sand-flushing tool |
| 01/16/2013 | CN202673206U Well-flushing fluidic device |
| 01/16/2013 | CN202673184U Swirl centralizer for removing cuttings bed in well drilling process |
| 01/16/2013 | CN202673137U Piston type nail drift |
| 01/16/2013 | CN202671099U Portable equipment for flushing well with piston |
| 01/16/2013 | CN102884275A Storage apparatus |
| 01/16/2013 | CN102877806A Deslagging device |
| 01/16/2013 | CN102877805A Pressure-limiting device |
| 01/16/2013 | CN102877804A Pneumatic drill pore-forming and drilling dedusting equipment |
| 01/16/2013 | CN102877803A Negative pressure drilling dust removal device |
| 01/16/2013 | CN102877782A Rotary drilling rig and bittern collecting method |
| 01/15/2013 | US8353351 System and method for regulating pressure within a well annulus |
| 01/15/2013 | US8353349 Retaining and isolating mechanisms for magnets in a magnetic cleaning tool |
| 01/15/2013 | CA2678511C Wellbore monitor |
| 01/15/2013 | CA2600602C Annulus pressure control drilling systems and methods |
| 01/15/2013 | CA2546358C Downhole tool |
| 01/11/2013 | CA2746918A1 Wellbore circulation tool and method |
| 01/10/2013 | WO2012138383A3 Drilling motor valve and method of using same |
| 01/10/2013 | WO2012004235A3 Method for preventing the escape of environmentally harmful substances in underwater drilling operations and pipe string therefor |
| 01/10/2013 | WO2011161250A3 Fluid partition unit |
| 01/10/2013 | WO2011112869A3 Dual ball upper internal blow out preventer valve |
| 01/10/2013 | US20130008718 Control system and interface for a tunneling apparatus |
| 01/10/2013 | US20130008648 Apparatus and Method for Well Operations |
| 01/10/2013 | US20130008647 Apparatus and Method for Well Operations |
| 01/09/2013 | EP2542754A2 Flow control arrangement and method |
| 01/09/2013 | EP2542753A1 System and method for safe well control operations |
| 01/09/2013 | CN202659182U Hydraulic slag discharge system for multifunctional caterpillar roofbolters |
| 01/09/2013 | CN202659181U Multifunctional well-washing monitoring control device |
| 01/09/2013 | CN202659180U Control device for intelligent drilling mud solid control system |
| 01/09/2013 | CN202659142U Integrated joint of water slagging system |
| 01/09/2013 | CN202659139U Pneumatic stirring and drilling device |
| 01/09/2013 | CN102865104A Downward extraction drilling drainage device |
| 01/09/2013 | CN102865047A Bioremediation method for abandoned drilling fluids of oil and gas fields and shale gas fields |
| 01/09/2013 | CN102861681A Arc fan nozzle used for reducing dust |
| 01/09/2013 | CN101532936B Method and device for evaluating inhibiting ability of drilling fluid on formation and decomposition of hydrate |
| 01/08/2013 | US8347983 Drilling with a high pressure rotating control device |
| 01/08/2013 | US8347963 Controlling transient underbalance in a wellbore |
| 01/08/2013 | CA2702599C A surface pump assembly having a thrust chamber with a telescoping shaft |
| 01/08/2013 | CA2661725C Method and system for accessing subterranean deposits from the surface |
| 01/07/2013 | CA2789289A1 Oil well drilling fluids, oil well cement composition and slurry of weighting material |
| 01/03/2013 | WO2013002826A1 Method for removing contaminants from wastewater in hydraulic fracturing process |
| 01/03/2013 | WO2013002647A1 Sieve cloth and method of using same |
| 01/03/2013 | WO2013000764A2 A fluid diverter system for a drilling facility. |
| 01/03/2013 | WO2012127396A3 System for degassing a liquid |
| 01/03/2013 | US20130000923 Downhole Circulation Apparatus |
| 01/03/2013 | US20130000917 Casing fill-up fluid management tool |
| 01/03/2013 | CA2840326A1 Gas injection for managed pressure drilling |
| 01/03/2013 | CA2839620A1 A fluid diverter system for a drilling facility |
| 01/03/2013 | CA2839169A1 Sieve cloth and method of using same |
| 01/03/2013 | CA2805295A1 Method for removing contaminants from wastewater in hydraulic fracturing process |
| 01/02/2013 | EP2539658A2 Cleaning apparatus and method for a material dryer |
| 01/02/2013 | EP2539536A2 Drilling system and method of operating a drilling system |
| 01/02/2013 | CN202645571U Novel lateral water supply device for electric coal drill |
| 01/02/2013 | CN202645493U Washable well slip type packer |
| 01/02/2013 | CN202645480U Electric revolving screen |
| 01/02/2013 | CN202645479U Rotary multidirectional well-washing vehicle connector |
| 01/02/2013 | CN202645478U High-pressure water jet pneumatic negative pressure drilling dust removal device |
| 01/02/2013 | CN202645477U Bored pile vibrating screen slag eliminating device |
| 01/02/2013 | CN202645476U Slurry purifying sand removing device |
| 01/02/2013 | CN202645475U Device for receiving and conveying well cuttings |