| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 02/20/2013 | CN202745857U On-line measurement device for gas yield and liquid yield of natural gas single well |
| 02/20/2013 | CN202745856U Oil well metering device |
| 02/20/2013 | CN202745855U Water injection well test device |
| 02/20/2013 | CN202745854U Hard shut-in simulation experiment device for petroleum drilling |
| 02/20/2013 | CN202745840U High-efficiency injection pipe string for large-inclination well |
| 02/20/2013 | CN202745724U Centering device for underground probe type measuring instrument |
| 02/20/2013 | CN102939433A Wellbore surveillance system |
| 02/20/2013 | CN102939432A Annulus pressure setpoint correction using real time pressure while drilling measurements |
| 02/20/2013 | CN102937022A System, device and method for transmitting near-bit drilling signals |
| 02/20/2013 | CN102937021A 地面接收显示单元 Ground receiving display unit |
| 02/20/2013 | CN102937020A Resistivity electronic cabin provided with elastic supporting structure |
| 02/20/2013 | CN102937019A Weak signal generation device |
| 02/20/2013 | CN101886541B Opposed steering large-power signal source system for long-distance large-caliber oil-gas pipeline |
| 02/20/2013 | CN101832130B Surface real-time processing of downhole data |
| 02/20/2013 | CN101832126B Small slam logging instrument |
| 02/20/2013 | CN101824999B Technology for measuring gas pressure of coal bed by utilizing through beds hole |
| 02/20/2013 | CN101581216B Driving depth calculation and control methods of large-size pipe shared by three bunchy wells |
| 02/19/2013 | US8378842 Downhole component with an electrical device in a blind-hole |
| 02/19/2013 | US8378841 Tracking of oil drilling pipes and other objects |
| 02/19/2013 | US8376065 Monitoring drilling performance in a sub-based unit |
| 02/19/2013 | US8376052 Method and system for surface production of gas from a subterranean zone |
| 02/19/2013 | US8376050 Sampling skid for subsea wells |
| 02/19/2013 | US8375773 Methods for contacting a surface with a fluid containing a marker to determine the wettability of the surface |
| 02/14/2013 | WO2013022725A2 Realtime dogleg severity prediction |
| 02/14/2013 | WO2013022646A2 Systems and methods for downhole communications using power cycling |
| 02/14/2013 | WO2013022569A1 Methods for monitoring fluids within or produced from a subterranean formation using opticoanalytical devices |
| 02/14/2013 | WO2013022558A2 Methods for monitoring the formation and transport of an acidizing fluid using opticoanalytical devices |
| 02/14/2013 | WO2013022424A1 Systems and methods of storage and automated self-check and operational status of rig tools |
| 02/14/2013 | WO2012167078A3 Apparatus and method for determining inclination and orientation of a downhole tool using pressure measurements |
| 02/14/2013 | WO2012068205A3 Method and apparatus for determining the size of a borehole |
| 02/14/2013 | US20130041586 Realtime dogleg severity prediction |
| 02/14/2013 | US20130037263 Fluid Sensor and Method of Using Same |
| 02/14/2013 | US20130036812 Method and apparatus for detecting tightness of threaded joints of drill rods |
| 02/14/2013 | CA2843519A1 Methods for monitoring fluids within or produced from a subterranean formation during acidizing operations using opticoanalytical devices |
| 02/14/2013 | CA2843518A1 Methods for monitoring fluids within or produced from a subterranean formation using opticoanalytical devices |
| 02/14/2013 | CA2843341A1 Methods for monitoring the formation and transport of a fracturing fluid using opticoanalytical devices |
| 02/14/2013 | CA2842944A1 Methods for monitoring the formation and transport of a treatment fluid using opticoanalytical devices |
| 02/14/2013 | CA2842703A1 Methods for monitoring the formation and transport of an acidizing fluid using opticoanalytical devices |
| 02/14/2013 | CA2842196A1 Methods for monitoring fluids within or produced from a subterranean formation during fracturing operations using opticoanalytical devices |
| 02/14/2013 | CA2842191A1 Methods for monitoring and modifying a fluid stream using opticoanalytical devices |
| 02/13/2013 | EP2556212A2 Detecting and meausuring a coring sample |
| 02/13/2013 | EP2556211A2 Real time data compression and transmission |
| 02/13/2013 | CN202731908U Storage type compensated neutron logging tool |
| 02/13/2013 | CN202731906U System for monitoring temperature, stress and deformation of shaft freezing wall in real time |
| 02/13/2013 | CN202731904U Recording instrument for low-yield well intermittent liquid yielding conditions |
| 02/13/2013 | CN202731903U One-emitter two-receiver well logging transducer of sound ranger |
| 02/13/2013 | CN202731902U Storage type digital sound wave logger |
| 02/13/2013 | CN202731901U Wired and wireless combined type electromagnetic wave measurement while drilling device used in coal mine |
| 02/13/2013 | CN202731900U Simulating loss device |
| 02/13/2013 | CN202731899U Rope finder used for steel wire operation |
| 02/13/2013 | CN202731898U Gas partial pressure skid-mounted device for judging pipeline freeze and block position |
| 02/13/2013 | CN202731897U Magnetoresistive angular transducer for caliper logging tool |
| 02/13/2013 | CN202731896U Six-arm hole diameter logger graduator |
| 02/13/2013 | CN202731895U Plate spring storage type hole diameter logger |
| 02/13/2013 | CN202731894U Oil well liquid level on-line automatic monitoring system |
| 02/13/2013 | CN202731893U Liquid level measurement system for gas producing well |
| 02/13/2013 | CN202731892U Shaft liquid level monitoring device |
| 02/13/2013 | CN202731891U Device for measuring well depth while drilling |
| 02/13/2013 | CN202731890U Pitching ball release type device for well logging |
| 02/13/2013 | CN202731889U Scale indication guide bar |
| 02/13/2013 | CN202731888U Detecting device capable of achieving three-dimensional imaging of drill hole |
| 02/13/2013 | CN202731887U Multifunctional simulation test well |
| 02/13/2013 | CN202731886U Oil field underground casing pipe detection location instrument |
| 02/13/2013 | CN202731885U Lead mold with reusable steel core |
| 02/13/2013 | CN202731884U Intelligent feedback measurement and control device for borehole water-pressure test |
| 02/13/2013 | CN202731883U Natural gas metering separation device |
| 02/13/2013 | CN202731882U Multifunctional metering tank |
| 02/13/2013 | CN202731881U Horizontal well logging protection fork |
| 02/13/2013 | CN202731880U Logging truck with hoisting function |
| 02/13/2013 | CN202731879U Cut-and-thread fishing cable anti-wear device for petroleum logging |
| 02/13/2013 | CN202731878U 泵下枪 Pump under the gun |
| 02/13/2013 | CN202731877U Simulated physical simulation experiment instrument of oil and gas migration and accumulation |
| 02/13/2013 | CN202731876U Weight and volume metering separator |
| 02/13/2013 | CN202731875U Dynamic monitoring device of producing well |
| 02/13/2013 | CN202731874U Rotatable self-adaption compensator for continuous oil pipe testing string |
| 02/13/2013 | CN202731873U Measuring and controlling device of fracturing wellhead protector |
| 02/13/2013 | CN202731872U Cable sour rot weak point type headstall |
| 02/13/2013 | CN202731835U Clamp-type wellhead pressure testing valve |
| 02/13/2013 | CN202731797U Push rod type bailing device |
| 02/13/2013 | CN102933794A Multi-wavelength dts fiber window with psc fibers |
| 02/13/2013 | CN102933793A Formation evaluation using a bit-based active radiation source and a gamma ray detector |
| 02/13/2013 | CN102933787A PDC sensing element fabrication process and tool |
| 02/13/2013 | CN102932221A Communication system and communication method for underground logging instrument bus |
| 02/13/2013 | CN102926744A Signal acquisition circuit of horizontal well dual caliper |
| 02/13/2013 | CN102926743A Load and displacement integral wireless indicator of belt type pumping unit and detection system of load and displacement integral wireless indicator |
| 02/13/2013 | CN102926742A 填砂管 Filling sand tube |
| 02/13/2013 | CN102926741A Rotational flow booster for turbine flow meter |
| 02/13/2013 | CN102926740A Hydraulic sidewall contact device for through casing resistivity logger |
| 02/13/2013 | CN102926739A Double-U-shaped-pipe type high-temperature high-pressure fluid density sensor |
| 02/13/2013 | CN102926716A Oil pumping unit system |
| 02/13/2013 | CN102926687A Integrated downhole tool for detecting, washing and fishing in oil-well operation |
| 02/13/2013 | CN102022083B Rotary guide well drilling tool |
| 02/13/2013 | CN101839131B Method and structure for optimizing axial fluid line in cylindrical matrix |
| 02/13/2013 | CN101649737B Method for detecting perforation hole and collar in horizontal well sleeve pipe based on retractor drive current analysis |
| 02/13/2013 | CN101550819B Flexible sucker rod string uphole and downhole technique |
| 02/13/2013 | CN101517191B Method of and system for determining the free point in a drill pipe |
| 02/13/2013 | CN101421490B A method and apparatus for ion-selective discrimination of fluids downhole |
| 02/13/2013 | CN101333925B Oil gas water three phase on-line inseparate flow measurement system |
| 02/13/2013 | CN101333924B Oil gas water flow measurement system |
| 02/12/2013 | US8373418 Subsea electronic modules |