| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 07/03/2013 | CN203035192U Simulator for observing fluid flow in porous medium |
| 07/03/2013 | CN203035191U Drilling pressure measuring device |
| 07/03/2013 | CN203035190U Combination measuring device of underground engineering construction drilling occurrence |
| 07/03/2013 | CN203035189U Induced transmission circuit with function of sleeve protection |
| 07/03/2013 | CN203035188U Test experimental device for adhering sand casing pipe cement bond strength |
| 07/03/2013 | CN203035187U Mechanical type bottom reaming drill dynamic visual device of filling pile |
| 07/03/2013 | CN203035186U Visual experiment device and system for pulverized coal settlement of coal-bed gas well shaft |
| 07/03/2013 | CN203035185U Automatic collection system of original data in coal mine underground measurement |
| 07/03/2013 | CN203035184U Sidetrack horizontal well lead print |
| 07/03/2013 | CN203035183U Pressure-bearing electronic circuit frame |
| 07/03/2013 | CN203035182U Underground pulsating pressure simulator |
| 07/03/2013 | CN203035181U Multifunctional oil-electricity monitoring device |
| 07/03/2013 | CN203035180U Portable type safety monitoring device of air drilling |
| 07/03/2013 | CN203035161U Combined type detection drift well gauge |
| 07/03/2013 | CN203033700U Constant tension intelligent control system of oil field hydraulic logging winch |
| 07/03/2013 | CN103184887A Method for underground tunnel drilling construction and geological information inversing |
| 07/03/2013 | CN103184867A Jet packer ground simulation method applicable to multilevel hydraulic jet fracturing |
| 07/03/2013 | CN103184866A Well cementation cement sheath integrity simulation and evaluation tester |
| 07/03/2013 | CN103184865A Variable-temperature-field displacement simulator for multi-thermal fluid |
| 07/03/2013 | CN103184864A Gas well testing safety monitoring and controlling technology |
| 07/03/2013 | CN103184863A Oil well remote intelligent indicator diagram test diagnosis measurement process technology |
| 07/03/2013 | CN103184862A Three-dimensional MEMS (Micro-electromechanical Systems) accelerometer measurement part for petroleum well logging and preparation method thereof |
| 07/03/2013 | CN103184861A Crude oil sand content analysis device |
| 07/03/2013 | CN101963054B Underground synchronous developing and imaging device and use method thereof |
| 07/02/2013 | US8474548 Measurement while drilling apparatus and method of using the same |
| 07/02/2013 | US8474530 Method and apparatus for a high side orienting sub for multi-lateral installations |
| 07/02/2013 | US8474529 Control of concentric tubing direction |
| 07/02/2013 | CA2603117C Intelligent efficient servo-actuator with dynamic seal for a downhole pulser |
| 06/27/2013 | WO2013096576A1 Systems and methods for measuring borehole caliper in oil-based mud |
| 06/27/2013 | WO2013096571A1 System and method for measuring formation properties |
| 06/27/2013 | WO2013096565A1 Systems and methods for downhole cement evaluation |
| 06/27/2013 | WO2013096550A1 Thermal buffering of downhole equipment with phase change material |
| 06/27/2013 | WO2013096235A1 Facilitating operation of a seismic source |
| 06/27/2013 | WO2013095997A1 Formation properties from conductivity tensor |
| 06/27/2013 | WO2013095754A1 Insulation structure for well logging instrument antennas |
| 06/27/2013 | WO2013095723A1 Well pumping and control system |
| 06/27/2013 | WO2013092906A2 Estimating tilt of a reservoir |
| 06/27/2013 | WO2013092836A1 Downhole mapping system |
| 06/27/2013 | WO2013092804A1 Stimulation method |
| 06/27/2013 | WO2013092801A1 An annular barrier with an expansion detection device |
| 06/27/2013 | WO2013091034A1 Method for testing non-uniform loads in pipes |
| 06/27/2013 | WO2013012832A9 Adaptive pump control for positive displacement pump failure modes |
| 06/27/2013 | WO2012119837A3 Method and system for well and reservoir management in open hole completions as well as method and system for producing crude oil |
| 06/27/2013 | WO2012052402A3 Latching apparatus and method |
| 06/27/2013 | US20130166263 Systems and Methods for Wellbore Optimization |
| 06/27/2013 | US20130160998 Lost Circulation Materials and Methods of Using Same |
| 06/27/2013 | US20130160997 Groundwater management system |
| 06/27/2013 | US20130160996 Downhole Packer Assembly Having a Selective Fluid Bypass and Method for Use Thereof |
| 06/27/2013 | US20130160995 Reducing axial wave reflections and identifying sticking in wireline cables |
| 06/27/2013 | US20130160539 Method for pressure compensatng a transducer |
| 06/27/2013 | CA2858475A1 Downhole mapping system |
| 06/27/2013 | CA2858473A1 Stimulation method |
| 06/27/2013 | CA2858472A1 An annular barrier with an expansion detection device |
| 06/26/2013 | EP2607929A1 Systems and methods for measuring borehole caliper in oil-based mud |
| 06/26/2013 | EP2607623A1 Downhole pressure pulse generator and method |
| 06/26/2013 | EP2607622A1 System and method for measuring formation properties |
| 06/26/2013 | EP2607621A1 Downhole mapping system |
| 06/26/2013 | EP2607620A1 Thermal buffering of downhole equipment with phase change material |
| 06/26/2013 | EP2607614A1 An annular barrier with an expansion detection device |
| 06/26/2013 | EP2607609A1 Stimulation method |
| 06/26/2013 | EP2606382A2 Method to predict dense hydrocarbon saturations for high pressure high temperature |
| 06/26/2013 | CN203022736U Novel mud pulse generator |
| 06/26/2013 | CN203022735U Wireless data inter-transmission formation testing system |
| 06/26/2013 | CN203022734U Layered seal examining tester |
| 06/26/2013 | CN203022733U Tubing string leakage measuring device |
| 06/26/2013 | CN203022732U Slurry leakage measurer |
| 06/26/2013 | CN203022731U Freezing hole deflection measurement disk |
| 06/26/2013 | CN203022730U Key separation prevention structure of wireless inclinometer while drilling |
| 06/26/2013 | CN203022729U Signal generator for testing wireless inclinometer while drilling |
| 06/26/2013 | CN203022728U Anti-corrosion pressure transmitter for wireless inclinometer while drilling |
| 06/26/2013 | CN203022727U Ground interface box of wireless inclinometer while drilling |
| 06/26/2013 | CN203022726U Multifunctional exploring tube clinometer device |
| 06/26/2013 | CN203022725U Tester for testing stress of pipe pile |
| 06/26/2013 | CN203022724U Control monitoring device of rotary blowout preventer |
| 06/26/2013 | CN203022723U Liquid feeding monitor of gathering well |
| 06/26/2013 | CN203022722U Remote metering system for oil well |
| 06/26/2013 | CN203022721U Aluminum alloy logging probe |
| 06/26/2013 | CN203022720U Underground wireless LWD (logging while drilling) detection device |
| 06/26/2013 | CN203022719U Sand-filling and sand-setting experimental device for sand prevention |
| 06/26/2013 | CN203022718U Device for treating hydrogen sulfide in formation water and reacted acid |
| 06/26/2013 | CN203022717U Small weight indicator for petroleum drilling |
| 06/26/2013 | CN203022716U Logging instrument guide short section applicable to multilateral well |
| 06/26/2013 | CN203022715U Fixed structure used for transformer sub and transformer sub |
| 06/26/2013 | CN203022682U Setting device for detection pressurization of gas tightness of casing pipe |
| 06/26/2013 | CN203022678U Blowout preventer pressure testing and boosting device |
| 06/26/2013 | CN103180541A Managed pressure drilling apparatus |
| 06/26/2013 | CN103180539A Downhole inductive coupler assemblies |
| 06/26/2013 | CN103174412A Coal bed gas reservoir layering co-mining high temperature and high pressure discharging mining dynamic evaluation instrument |
| 06/26/2013 | CN103174411A Electromagnetic wave source signal system for range radar of horizontal well drilling detection stratum |
| 06/26/2013 | CN103174410A Method achieving transformation of time and depth through change in weight of downhole tool |
| 06/26/2013 | CN103174409A Testing device for packing performance of deepwater cementing cement sheath |
| 06/26/2013 | CN103174408A Inflatable capacitance type water cut and flow compound sensor |
| 06/26/2013 | CN103174401A Ground device of perforating fracturing testing system |
| 06/26/2013 | CN103174397A Test device and test method of simulating well concentration cement slurry displacement efficiency |
| 06/26/2013 | CN103174391A Control system of coiled tubing underground tractor driven by electronic control hydraulic pressure |
| 06/26/2013 | CN102128029B Double-interface ultrasonic detection imaging method for cased well |
| 06/26/2013 | CN102128028B Ultrasonic signal inversion method for evaluating cement and formation interface cementing quality |
| 06/26/2013 | CN101976494B Real-time logging data acquisition and synchronous early-warning method |
| 06/26/2013 | CN101906960B Wire rope-free jointing device of water injection well measurement adjuster |
| 06/25/2013 | US8473211 Methods of correcting accelerometer and magnetometer measurements |