| 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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| 02/27/2013 | CN102943639A Drilling fluid circulation system |
| 02/27/2013 | CN102943638A Water jet cleaning system for large-diameter deep well |
| 02/27/2013 | CN102943620A Pressure-controlled drilling method based on drilling annulus wellbore multi-phase flow computing |
| 02/26/2013 | US8381816 Flushing procedure for rotating control device |
| 02/26/2013 | US8381813 Methods for servicing subterranean wells |
| 02/26/2013 | CA2544093C Fluid jet drilling tool |
| 02/21/2013 | WO2013025233A1 System and method for treating an excavation activity |
| 02/21/2013 | WO2011106579A3 Wellbore valve, wellbore system, and method of producing reservoir fluids |
| 02/21/2013 | US20130043045 Flow stop valve |
| 02/21/2013 | US20130043020 Method of drilling and running casing in large diameter wellbore |
| 02/21/2013 | CA2845211A1 System and method for treating an excavation activity |
| 02/21/2013 | CA2798561A1 Apparatus and method for detecting gases conveyed by drilling fluids from subterranean wells |
| 02/20/2013 | CN202745920U Gas coal dust separator |
| 02/20/2013 | CN202745846U Perforating, fracturing and sand washing integrated string for coiled tubing |
| 02/20/2013 | CN202745821U Suspended environmental-friendly operating platform |
| 02/20/2013 | CN202745764U Oil-water supplying device |
| 02/20/2013 | CN202745763U Steady foam reservoir carding apparatus |
| 02/20/2013 | CN202745762U Mining wind and water three-joint quick conversion valve |
| 02/20/2013 | CN202745761U Simulation test flow device |
| 02/20/2013 | CN202745760U Uninterrupted drilling fluid circulating valve |
| 02/20/2013 | CN202745759U Self-starting underground check valve |
| 02/20/2013 | CN202745758U Internal-jet type slurry filter |
| 02/20/2013 | CN202745757U Mining orifice dust remover |
| 02/20/2013 | CN202745756U Negative pressure drilling dust removal device |
| 02/20/2013 | CN202745755U Combination extension rod type water supply device |
| 02/20/2013 | CN202745754U Anti-pollution well washing device of oil pumping well |
| 02/20/2013 | CN202745718U Electric coal drill |
| 02/20/2013 | CN202745684U Central pipe for faucet of drilling and repairing machine |
| 02/20/2013 | CN102939432A Annulus pressure setpoint correction using real time pressure while drilling measurements |
| 02/20/2013 | CN102939185A Device for a hydraulic hammer |
| 02/20/2013 | CN102937017A Flushing protection gas anchor |
| 02/20/2013 | CN102168530B Pressure drilling device for a drill stem and a using method thereof |
| 02/20/2013 | CN101377122B Flow divider for sea petroleum well drilling |
| 02/19/2013 | CA2469960C Method for optimizing the production of an oil deposit in the face of uncertainties |
| 02/14/2013 | WO2013021010A1 Device for extracting at least one gas contained in a circulating fluid |
| 02/13/2013 | EP2557266A1 Downhole swivel apparatus and method |
| 02/13/2013 | EP2557265A1 Device for extracting at least one gas contained in a circulating fluid. |
| 02/13/2013 | CN202731793U Sand wash blockage removing tool in casing pipe |
| 02/13/2013 | CN202731778U Drill collar lifting device |
| 02/13/2013 | CN102933962A Method and device for determining the local extension of mineral material in a rock |
| 02/13/2013 | CN102933791A Method for maintaining wellbore pressure |
| 02/13/2013 | CN102933790A Method and apparatus for increasing the yield in a deposit |
| 02/13/2013 | CN102926730A Mining method for support pipe following air liquid spraying and drilling into coal bed gas of radial well |
| 02/13/2013 | CN102926704A Pressure-balancing one-way valve for coiled-tubing layering fracturing |
| 02/13/2013 | CN102926692A Water pipe nozzle |
| 02/13/2013 | CN102926691A Sand discharge device for cyclones |
| 02/13/2013 | CN102926690A Device for recovering mud inside square well |
| 02/13/2013 | CN102926689A Drilling cuttings amount collector |
| 02/13/2013 | CN102926688A Reverse-circulation drilling machine with double functions of pump lift and pump suction |
| 02/13/2013 | CN102926687A Integrated downhole tool for detecting, washing and fishing in oil-well operation |
| 02/13/2013 | CN102926686A Directional water feeder and directional drilling machine |
| 02/13/2013 | CN102926678A Long-tail-pipe well washing protector for preventing corrosion of casing |
| 02/13/2013 | CN102022082B A ground instruction transmission method for controlling rotary steering drilling tool and an apparatus for the same |
| 02/13/2013 | CN101725327B Intelligent monitoring method aiming at well drilling overflowing and leakage |
| 02/12/2013 | US8371399 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 02/12/2013 | US8371381 Engineered fibers for well treatments |
| 02/07/2013 | WO2013019523A2 Method and system for sampling multi-phase fluid at a production wellsite |
| 02/07/2013 | WO2013019522A2 System and method for sampling multiphase fluid at a production wellsite |
| 02/07/2013 | WO2013019188A1 Gas generating system for stimulation and deliquification |
| 02/07/2013 | US20130032409 Methods of Preventing Emulsification of Crude Oil in Well Bore Treatment Fluids |
| 02/07/2013 | US20130032396 Fluid transfer device usable in managed pressure and dual-gradient drilling |
| 02/07/2013 | CA2843505A1 A downhole device for data acquisition during hydraulic fracturing operation and method thereof |
| 02/06/2013 | EP2553215A1 Subterranean well valve activated with differential pressure |
| 02/06/2013 | EP2553211A2 Downhole actuating apparatus |
| 02/06/2013 | EP2553210A2 Mechanical counter |
| 02/06/2013 | EP2553209A1 Method for maintaining wellbore pressure |
| 02/06/2013 | EP2553208A1 High pressure shear nozzle for inline conditioning of drilling mud |
| 02/06/2013 | EP2553041A1 Reconditioning and reuse of wellbore servicing fluids |
| 02/06/2013 | CN202718644U Hydraulic integrated riser tensioning ring |
| 02/06/2013 | CN102913210A Screen pipe completion system |
| 02/06/2013 | CN102913160A Continuous circulation drilling well system |
| 02/06/2013 | CN102913159A Continuous circulation valve |
| 02/06/2013 | CN102913158A Using method for dust removal cover |
| 02/06/2013 | CN102913157A Underground sleeve rotational flow guider |
| 02/06/2013 | CN102913156A Sand washing pump |
| 02/06/2013 | CN102913155A Cuttings bed scavenger |
| 02/06/2013 | CN102913130A Full-hydraulic rock-drilling excavator using hydraulic excavator for production |
| 02/06/2013 | CN101925720B Injection spigot |
| 02/06/2013 | CN101427002B Method of controlling operation of rock drilling rig, and rock drilling rig |
| 02/05/2013 | CA2653373C Compositions and methods for gas and oil well treatment |
| 02/05/2013 | CA2542413C Nozzle unit and method for excavating a hole in an object |
| 01/31/2013 | WO2013016669A2 Active equivalent circulating density control with real-time data connection |
| 01/31/2013 | WO2013015992A2 Selective hydraulic fracturing tool and method thereof |
| 01/31/2013 | WO2012102620A8 Check valve |
| 01/31/2013 | US20130025940 Active equivalent circulating density control with real-time data connection |
| 01/31/2013 | US20130025850 Method of drilling and running casing in large diameter wellbore |
| 01/31/2013 | CA2842817A1 Device for producing a bore in the ground, rotary drive device and rotary seal arrangement |
| 01/31/2013 | CA2841078A1 Selective hydraulic fracturing tool and method thereof |
| 01/30/2013 | EP2550426A1 Manifold string for selectively controlling flowing fluid streams of varying velocities in wells from a single main bore |
| 01/30/2013 | EP2550422A1 Pressure controlled well construction and operation systems and methods usable for hydrocarbon operations, storage and solution mining |
| 01/30/2013 | CN202706960U Combined type porthole wind jet flow double power dust remover |
| 01/30/2013 | CN202706959U Gate valve capable of preventing slurries from depositing |
| 01/30/2013 | CN202706958U Sea valve |
| 01/30/2013 | CN202706957U Engineering driller water faucet |
| 01/30/2013 | CN202706956U Multifunctional overflow recovery device |
| 01/30/2013 | CN202706955U Flow-splitting filter mechanism for drilling fluid of underground pressurizing accelerating system |
| 01/30/2013 | CN202706954U Novel slurry separator |
| 01/30/2013 | CN202706953U Vehicle-mounted anti-pollution sand-flushing tank |
| 01/30/2013 | CN202706952U Dedusting and cleaning device by wind-water linkage atomizing in coal seam drilling |
| 01/30/2013 | CN202706951U Water fog jet-flow dust remover for drilling of portholes |