| 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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| 06/05/2013 | CN202970552U High-efficiency slag removing system for pile foundation engineering |
| 06/05/2013 | CN202970551U Continuous sand washing device for integral joint tubing |
| 06/05/2013 | CN202970550U Rotational-flow sand washing and deblocking pipe column for horizontal well |
| 06/05/2013 | CN202970549U Hole cleaning device for mechanical hole forming under karst landform |
| 06/05/2013 | CN202970548U Gas jet flow dust collector for mine drilling |
| 06/05/2013 | CN202970547U Single-vehicle-mounted well flushing vehicle without pressure relief |
| 06/05/2013 | CN202970519U Lined pipe sealing short joint |
| 06/05/2013 | CN202970434U Hydraulic rock drill |
| 06/05/2013 | CN103140646A Abrasive perforator with fluid bypass |
| 06/05/2013 | CN103132936A Simple and easy bypass valve of after-used positive displacement motor |
| 06/05/2013 | CN103132935A Staged vacuum drying treatment process and treatment device for oilfield drilling cuttings |
| 06/05/2013 | CN103132934A Pumping conventional well flushing method of fixed tubes, rods and pillars of sand-prevention pumping well |
| 06/05/2013 | CN103132904A Anchor rod assisting drilling machine |
| 06/04/2013 | US8455402 Wellbore operations using controlled variable density fluid |
| 06/04/2013 | US8453735 Method and biodegradable water based thinner composition for drilling subterranean boreholes with aqueous based drilling fluid |
| 06/04/2013 | CA2463413C Testing drill packer |
| 05/30/2013 | WO2013077947A1 Releasing activators during wellbore operations |
| 05/30/2013 | WO2013075252A1 Solids control system and method |
| 05/30/2013 | WO2012048003A3 Method and apparatus for fluid treatment |
| 05/30/2013 | US20130133948 Use of downhole pressure measurements while drilling to detect and mitigate influxes |
| 05/30/2013 | US20130133893 Debris removal system for downhole closure mechanism, and method thereof |
| 05/30/2013 | CA2856365A1 Systems and methods for continuous and near continuous drilling |
| 05/30/2013 | CA2853441A1 Releasing activators during wellbore operations |
| 05/29/2013 | EP2596203A2 Drill pipe |
| 05/29/2013 | CN202954763U Bottom valve of oil drilling fluid solid control system |
| 05/29/2013 | CN202954762U Multi-track drilling fluid vibrating screen |
| 05/29/2013 | CN202954761U Low weir slurry vibration screen |
| 05/29/2013 | CN202954760U Drilling fluid slurry-transfer device |
| 05/28/2013 | CA2694482C Continuous flow drilling systems and methods |
| 05/28/2013 | CA2461524C Method of sealing subterranean zones |
| 05/24/2013 | CA2794016A1 Foam filled composite construction panel with heating and cooling means |
| 05/23/2013 | WO2013074392A1 Hydrostatic pressure independent actuators and methods |
| 05/23/2013 | WO2013071371A1 Solids removal unit |
| 05/23/2013 | WO2013071369A1 Pressure feed system for a down hole drill |
| 05/23/2013 | WO2013005091A3 Multiphase flowmeter |
| 05/23/2013 | WO2013001512A3 Gas injection for managed pressure drilling |
| 05/23/2013 | WO2012028949A3 Dual activity drilling ship |
| 05/22/2013 | EP2593632A1 Sieve device for untreated drilling mud and a method of using same |
| 05/22/2013 | CN202946119U Pour-point reduction and gas injection energization integrated construction tubular column for high pour-point oil stratums |
| 05/22/2013 | CN202946061U Zero-torque drilling machine |
| 05/22/2013 | CN202946060U Automatic adjusting device for liquid level of vacuum degasser |
| 05/22/2013 | CN202946059U Drilling fluid circulating system |
| 05/22/2013 | CN202946058U Split type slurry rotating joint |
| 05/22/2013 | CN202946057U Collector with movable and static combination sealing structure |
| 05/22/2013 | CN202946056U Recyclable device of thickened oil horizontal well screen pipe |
| 05/22/2013 | CN1856636B Solid-liquid separation of oil-based muds |
| 05/22/2013 | CN103114809A Vibration absorption type downhole hydraulic pulse generation device and well drilling method thereof |
| 05/22/2013 | CN103114806A 旋挖钻机 Rotary Drilling Rig |
| 05/22/2013 | CN103114577A Rotary excavating hole-forming construction method for building pile foundation |
| 05/22/2013 | CN102268963B Basement rock fractured formation mixed drilling well completion process |
| 05/22/2013 | CN102080530B Method for constructing horizontal coal bed gas well and vertical drainage and mining well |
| 05/22/2013 | CN101994493B Compound perforation dynamic depressurization device for oil gas well |
| 05/22/2013 | CN101158267B Method and system for accessing subterranean deposits from the surface |
| 05/21/2013 | CA2737870C Microemulsifiers and methods of making and using same |
| 05/21/2013 | CA2711192C Method and apparatus for programmable pressure drilling and programmable gradient drilling, and completion |
| 05/16/2013 | WO2013070609A1 Apparatus and process for drilling a borehole in a subterranean formation |
| 05/16/2013 | WO2013070344A1 Elimination of hydraulic fluid contamination through internal bright annealing |
| 05/16/2013 | WO2013070315A1 Drill cuttings re-injection |
| 05/16/2013 | WO2012083047A3 Multi-zone fracturing completion |
| 05/16/2013 | WO2012021555A3 Fill up tool |
| 05/16/2013 | CA2876482A1 Managed pressure cementing |
| 05/16/2013 | CA2854812A1 Apparatus and process for drilling a borehole in a subterranean formation |
| 05/15/2013 | EP2592224A2 Methods and systems for drilling |
| 05/15/2013 | EP2592223A2 Methods and systems for drilling |
| 05/15/2013 | EP2592222A2 Methods and systems for drilling |
| 05/15/2013 | EP2591206A2 Dual-flow valve and swivel |
| 05/15/2013 | EP2591202A1 Circulation sub and method for using same |
| 05/15/2013 | CN202937222U Well-flushing packer capable of achieving downhole secondary setting |
| 05/15/2013 | CN202937205U Slurry purification circulator |
| 05/15/2013 | CN202937204U Rock waste discharging conversion device of mud processing system |
| 05/15/2013 | CN202937203U Extraction dust removal device of mine drilling machine |
| 05/15/2013 | CN202937202U Turnover mud tank |
| 05/15/2013 | CN202937194U Dustproof rock drilling machine |
| 05/15/2013 | CN103109035A Multi-purpose fill and circulate well tool |
| 05/15/2013 | CN103109034A Arrangement at a rock drill and a rock drill |
| 05/15/2013 | CN103104248A Method for measuring mud density and mass flow rate |
| 05/15/2013 | CN103104245A Sensor used for measuring mud density and mass flow rate |
| 05/15/2013 | CN103104244A Signal collecting circuit for mud parameter tester |
| 05/15/2013 | CN103104241A Signal collecting circuit and signal collecting method for mud parameter tester |
| 05/15/2013 | CN103104207A Nitrogen well-drilling system in well-drilling field and well-drilling method thereof |
| 05/15/2013 | CN103104206A Nitrogen well-drilling system in well-drilling field |
| 05/15/2013 | CN103104205A Nitrogen well-drilling method in well-drilling field |
| 05/15/2013 | CN103104204A Self-compensation target flowmeter |
| 05/15/2013 | CN103104203A Drilling-fluid solid-control control process |
| 05/15/2013 | CN103104202A Pump system for removing soft-layer soil body at bottom of rotatablely excavated pile hole |
| 05/15/2013 | CN103104191A Super-large-aperture pile foundation hole drilling machine |
| 05/15/2013 | CN103104190A Super-large-aperture pile foundation hole drilling machine |
| 05/15/2013 | CN101899967B Well completion technology for increasing water yield in poor aquifer |
| 05/14/2013 | US8439132 Microtunnelling system and apparatus |
| 05/14/2013 | CA2709698C Purging of fiber optic conduits in subterranean wells |
| 05/11/2013 | CA2793339A1 Metallic particle induced saponification of fatty acids as breakers for viscoelastic surfactant-gelled fluids |
| 05/10/2013 | WO2013039663A3 Magnetically coupled safety valve with satellite inner magnets |
| 05/10/2013 | WO2013016669A3 Active equivalent circulating density control with real-time data connection |
| 05/10/2013 | CA2848734A1 High energy in-line hydraulic shearing unit for oilfield drilling fluids |
| 05/09/2013 | US20130112631 Sieve device for untreated drilling mud and a method of using same |
| 05/09/2013 | US20130112482 Apparatus and Process For Drilling A Borehole In A Subterranean Formation |
| 05/09/2013 | US20130112428 Circulation sub and method for using same |
| 05/09/2013 | US20130112427 Split Ring Shift Control for Hydraulic Pulse Valve |
| 05/09/2013 | US20130112404 Preemptive setpoint pressure offset for flow diversion in drilling operations |
| 05/08/2013 | CN202926307U Well washing protective gas anchor |