| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 01/19/2011 | CN101949287A Method and device for modulating underground measurement while drilling data based on drilling fluid continuous pressure wave technology |
| 01/19/2011 | CN101949286A Remote real-time tracking method for well path |
| 01/19/2011 | CN101949285A Screen pipe completed well gel-breaking tester |
| 01/19/2011 | CN101587760B Cable of downhole monitoring system of horizontal steam injection well and preparing method thereof |
| 01/19/2011 | CN101509351B Non-damage drilling head |
| 01/18/2011 | US7873475 Device and method of measuring depth and azimuth |
| 01/18/2011 | US7872945 Dynamic efficiency optimization of piezoelectric actuator |
| 01/18/2011 | US7870912 Centralizer-based survey and navigation device and method |
| 01/18/2011 | US7870900 System and method for controlling a progressing cavity well pump |
| 01/13/2011 | WO2011006083A1 Identifying types of sensors based on sensor measurement data |
| 01/13/2011 | WO2011006054A2 Apparatus and method for reducing effects of eccentricity in induction tools |
| 01/13/2011 | WO2011005829A2 Unequal error protection for embedded coding of borehole images and variable-quality telemetry channels |
| 01/13/2011 | WO2011005436A2 Seismic measurements while drilling |
| 01/13/2011 | WO2011004180A2 Downhole apparatus, device, assembly and method |
| 01/13/2011 | WO2010120593A3 A microfluidic oscillating tube densitometer for downhole applications |
| 01/13/2011 | WO2010120507A3 System and method for communicating about a wellsite |
| 01/13/2011 | WO2010117670A3 Measuring with tuned transmitters and broadband receivers |
| 01/13/2011 | WO2010115012A3 System and method for monitoring subsea wells |
| 01/13/2011 | WO2010111630A3 Continuous geomechanically stable wellbore trajectories |
| 01/13/2011 | WO2010111352A3 Non-planar antennae for directional resistivity logging |
| 01/13/2011 | WO2010107856A3 Relative and absolute error models for subterranean wells |
| 01/13/2011 | WO2010105064A3 A novel configuration design of detector shielding for wireline and mwd/lwd down-hole thermal neutron porosity tools |
| 01/13/2011 | WO2010102109A3 Early kick detection in an oil and gas well |
| 01/13/2011 | WO2010102030A3 Method and apparatus for acoustic impedance and p-wave anisotropy measurements |
| 01/13/2011 | WO2009156957A3 Use of hydrophobic material |
| 01/13/2011 | US20110010097 Borehole stress module and methods for use |
| 01/13/2011 | US20110006773 EM-Guided Drilling Relative to an Existing Borehole |
| 01/13/2011 | US20110005835 Unequal Error Protection for Embedded Coding of Borehole Images and Variable-Quality Telemetry Channels |
| 01/13/2011 | US20110005746 Surface formation monitoring system and method |
| 01/13/2011 | US20110005745 Sampling and evaluation of subterranean formation fluid |
| 01/13/2011 | US20110005310 Methods for contacting a surface with a fluid containing a marker to determine the wettability of the surface |
| 01/13/2011 | CA2853398A1 Downhole apparatus, device, assembly and method |
| 01/13/2011 | CA2766729A1 Downhole apparatus, device, assembly and method |
| 01/12/2011 | EP2273067A1 Excavation device and profile analysis of the excavation itself and associated method. |
| 01/12/2011 | EP2273058A2 Apparatus, system and method for communicating while logging with wired drill pipe |
| 01/12/2011 | EP2271824A1 Geochemical surveillance of gas production from tight gas fields |
| 01/12/2011 | CN201707846U Drill floor explosion-proof display |
| 01/12/2011 | CN201705647U Comprehensive tester of measurement and diagnosis of screw pump well |
| 01/12/2011 | CN201705393U Combined sensor monitoring system for prewarning water bursting disaster in mine |
| 01/12/2011 | CN201705348U Pressure-bearing housing of petroleum logging instrument |
| 01/12/2011 | CN201705346U Single pole energy transducer for sonic logging |
| 01/12/2011 | CN201705345U Sonicator multi-receiving transducer |
| 01/12/2011 | CN201705344U Logging sonic wave emitter |
| 01/12/2011 | CN201705343U High-speed transmission sending device for measurement while drilling |
| 01/12/2011 | CN201705342U Ground signal receiving instrument for electromagnetic wave measurement while drilling |
| 01/12/2011 | CN201705341U Signal transmission device |
| 01/12/2011 | CN201705340U Controllable signal receiving instrument capable of loading pseudo random codes |
| 01/12/2011 | CN201705339U Numeric micro-sphere focus logging instrument |
| 01/12/2011 | CN201705338U Sidewall contact device of combination logging instrument |
| 01/12/2011 | CN201705337U Double-measuring-direction multi-arm well diameter measuring instrument |
| 01/12/2011 | CN201705336U Simple shaft temporary closing testing pipe column |
| 01/12/2011 | CN201705335U High-temperature differential well temperature test instrument |
| 01/12/2011 | CN201705334U Depthometer and complete set of appliances used with drill bit and drill bit |
| 01/12/2011 | CN201705333U Special centralizer for highly-deviated well |
| 01/12/2011 | CN201705332U Logging instrument metal vacuum bottle connecting structure |
| 01/12/2011 | CN201705331U Sector acoustic logging instrument simulation tester |
| 01/12/2011 | CN201705330U Mobile oil well multi-phase flow meter |
| 01/12/2011 | CN201705329U Balanced thrust multi-arm pushing device |
| 01/12/2011 | CN201705328U Propeller plug-and-socket connection structure |
| 01/12/2011 | CN201705327U Multi-core logging instrument connecting structure |
| 01/12/2011 | CN201705326U Thermal efficiency detection device |
| 01/12/2011 | CN201705325U Directional well fine zonal water injection flow testing and dispatching device |
| 01/12/2011 | CN201705324U Multi-angle eccentric mechanism for petroleum logging |
| 01/12/2011 | CN201705285U Gate valve for testing |
| 01/12/2011 | CN201705281U Cable through universal packer |
| 01/12/2011 | CN201705239U Detachable circuit seal structure |
| 01/12/2011 | CN201705222U Completion pipe string of pumping well of rod pump |
| 01/12/2011 | CN101942990A On-line underground temperature measurement system |
| 01/12/2011 | CN101942989A Portable well-depth measuring instrument |
| 01/12/2011 | CN101942988A One-way cooling device of well-drilling underground tester |
| 01/12/2011 | CN101942987A Simple sonic logger detection, calibration and ruling method |
| 01/12/2011 | CN101135242B Oil well liquid level measuring apparatus |
| 01/11/2011 | US7866207 Apparatus and method for fluid flow measurement with sensor shielding |
| 01/11/2011 | CA2510146C Estimation of borehole geometry parameters and lateral tool displacements |
| 01/11/2011 | CA2242978C Method and apparatus for determining formation pressure |
| 01/10/2011 | CA2709248A1 Method and apparatus to monitor reformation and replacement of co2/ch4 gas hydrates |
| 01/06/2011 | WO2010099484A4 System and method for wellbore monitoring |
| 01/06/2011 | WO2009098512A3 Apparatus and method for controlling the flow of downhole fluids |
| 01/06/2011 | WO2009064758A3 Apparatus and method for communicating information between a wellbore and surface |
| 01/06/2011 | WO2009014932A3 Apparatus and methods to perform operations in a wellbore using downhole tools having movable sections |
| 01/06/2011 | US20110001483 Subsea Electronic Modules |
| 01/06/2011 | US20110000713 System and method for drilling using drilling fluids |
| 01/06/2011 | US20110000661 Well jet device |
| 01/06/2011 | US20110000294 Method of analyzing a number of hydrocarbons contained in a drilling fluid, and associated device |
| 01/05/2011 | EP2270429A2 Method for determining a track of a geographical trajectory |
| 01/05/2011 | CN201696038U Intelligent keyless electronic locking system |
| 01/05/2011 | CN201696037U Directional ball seat |
| 01/05/2011 | CN201696036U Magnetic positioning oil well diameter logger |
| 01/05/2011 | CN201696035U Direct-reading electronic pressure gauge |
| 01/05/2011 | CN201696034U Storage type electronic pressure gauge |
| 01/05/2011 | CN201696033U 高温压力传感器 High Temperature Pressure Sensor |
| 01/05/2011 | CN201696032U Pipe depth and layer temperature measuring instrument of vertical ground heat exchanger |
| 01/05/2011 | CN201696031U Fluid piston effect test device of oil and gas fields |
| 01/05/2011 | CN201696030U Continuous gyro inclinometer with minor diameter and high accuracy |
| 01/05/2011 | CN201696029U Angle fixer |
| 01/05/2011 | CN201696028U Electronic inclinometer employing micro-silicon gyro |
| 01/05/2011 | CN201696027U Downhole ultrasonic flowmeter |
| 01/05/2011 | CN201696026U Electromagnetic defect detection thickness gauge |
| 01/05/2011 | CN201696025U Liquid phase metering valve of oil extraction metering device |
| 01/05/2011 | CN201696024U Oil extraction metering aneroid gasometer |