| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 05/28/2009 | WO2009048821A3 Downhole optical communication system and method |
| 05/28/2009 | WO2009045870A3 System and method for performing oilfield operations |
| 05/28/2009 | WO2009005956A4 Optical sensor for measuring downhole ingress of debris |
| 05/28/2009 | WO2005033633A3 Apparatus and method for fluid flow measurement with sensor shielding |
| 05/28/2009 | US20090133871 Drilling, perforating and formation analysis |
| 05/28/2009 | US20090133870 Method for Phase and Amplitude Correction in Controlled Source Electromagnetic Survey Data |
| 05/28/2009 | US20090133487 Downhole Communication Method and System |
| 05/28/2009 | CA2706309A1 Generating and updating true vertical depth indexed data and log in real time data acquisition |
| 05/28/2009 | CA2706297A1 Method and system for evaluating the characteristic properties of two contacting media and of the interface between them based on mixed surface waves propagating along the interface |
| 05/27/2009 | EP2063069A1 Autonomous wellbore navigation device |
| 05/27/2009 | EP2063068A1 Pipe and method of determining the shape of a pipe |
| 05/27/2009 | EP2062060A1 Measuring head and measuring method |
| 05/27/2009 | EP2062011A1 Flow meter |
| 05/27/2009 | CN201248109Y Mobile video monitoring system for oil well and mine well |
| 05/27/2009 | CN201246163Y Leakage test apparatus of oil conduit |
| 05/27/2009 | CN201246162Y Pressure test apparatus of blowout preventer |
| 05/27/2009 | CN201246161Y Well head lamination test device |
| 05/27/2009 | CN201246160Y Inner graduation circuit of high-frequency electromagnetic wave well logging instrument |
| 05/27/2009 | CN201246159Y Semi-seal device of horizontal well continuous tube simulator |
| 05/27/2009 | CN201246158Y Pipeline magnetic steel type impeller clip-proof protection device |
| 05/27/2009 | CN201246157Y Well cementing parameter integrative collecting system |
| 05/27/2009 | CN201246116Y Steel plastic composite collar capable of detecting sleeve tube |
| 05/27/2009 | CN101443531A Method for determining filtration properties of rocks |
| 05/27/2009 | CN101443530A Method for estimating confined compressive strength for rock formations utilizing Skempton theory |
| 05/27/2009 | CN101440707A Coal-bed gas pressure measuring instrument and measuring method thereof |
| 05/27/2009 | CN101440706A Terrestrial heat downhole water level measuring system |
| 05/27/2009 | CN101440705A Super-deep well wireless transmission well testing system |
| 05/27/2009 | CN101440700A Disconnection plugging test valve |
| 05/26/2009 | US7539548 Smart-control PLC based touch screen driven remote control panel for BOP control unit |
| 05/26/2009 | US7536905 System and method for determining a flow profile in a deviated injection well |
| 05/26/2009 | CA2551708C Automatic detecton of resonance frequency of a downhole system |
| 05/26/2009 | CA2492608C System and method for obtaining and analyzing well data |
| 05/22/2009 | WO2009064997A1 Tagging a formation for use in wellbore related operations |
| 05/22/2009 | WO2009064758A2 Apparatus and method for communicating information between a wellbore and surface |
| 05/22/2009 | WO2009064732A1 Wellbore depth computation |
| 05/22/2009 | WO2009064728A1 Well bore trajectory computation |
| 05/22/2009 | WO2009064656A2 Borehole survey method and apparatus |
| 05/22/2009 | WO2009064655A2 Position sensor for a downhole completion device |
| 05/22/2009 | WO2009062716A2 Measurements while drilling or coring using a wireline drilling machine |
| 05/22/2009 | WO2009024939A3 Creep determination technique |
| 05/22/2009 | WO2009023852A4 Apparatus and methods for pulse testing a formation |
| 05/22/2009 | CA2731561A1 Tagging a formation for use in wellbore related operations |
| 05/22/2009 | CA2705511A1 Apparatus and method for communicating information between a wellbore and surface |
| 05/21/2009 | US20090129203 Monopole acoustic transmitter comprising a plurality of piezoelectric discs |
| 05/21/2009 | US20090126995 Downhole abrading tool having taggants for indicating excessive wear |
| 05/21/2009 | CA2644385A1 Method and apparatus for measurement of formation fluid loss |
| 05/20/2009 | CN201241698Y Drill-following sound wave monopole transducer |
| 05/20/2009 | CN201241697Y Drill-following sound wave dipole transducer |
| 05/20/2009 | CN201241696Y Geological exploration drill coal-bed gas pressure determinator |
| 05/20/2009 | CN201241695Y Analog quantity capstan sensor |
| 05/20/2009 | CN201241694Y Direct-reading flowmeter for measuring downhole flow |
| 05/20/2009 | CN201241693Y 泥浆流量测定罐 Mud flow measuring tank |
| 05/20/2009 | CN201241692Y Wet natural gas multi-phase flowmeter |
| 05/20/2009 | CN201241691Y Cable brittle failure-proof pressured well logging construction apparatus |
| 05/20/2009 | CN201241690Y Oil, water and gas three-phase automatic separated metering device |
| 05/20/2009 | CN201241689Y Five-parameter combination logging tool |
| 05/20/2009 | CN201241681Y Horizontal even acid distributing experimental apparatus |
| 05/20/2009 | CN201241632Y Spring self-switching type Y-shaped joint |
| 05/20/2009 | CN201240911Y Emptying settling tank of measuring station |
| 05/20/2009 | CN101435329A Error rate test system based on Bayes theorem |
| 05/20/2009 | CN101435315A Method for positioning annular framework type sieve tube segment |
| 05/20/2009 | CN100489558C Method for solving implicit reservoir simulation matrix equation |
| 05/20/2009 | CN100489459C Strapdown inertial combined measurement controller adapted to whole-optical fiber digital slope level |
| 05/20/2009 | CN100489265C Intelligent seal-verifying and flow adjustment and measuring method and its device |
| 05/19/2009 | US7534995 Device for examining rotor drilled holes |
| 05/19/2009 | CA2481639C Improving reservoir communication by creating a local underbalance and using treatment fluid |
| 05/19/2009 | CA2373498C Pressure sensor assembly for wellbore |
| 05/14/2009 | WO2009061561A1 Measuring standoff and borehole geometry |
| 05/14/2009 | WO2009060411A2 Hydrocarbon monitoring cable |
| 05/14/2009 | WO2009029850A3 Method and apparatus for well-bore proximity measurement while drilling |
| 05/14/2009 | US20090123109 Temperature sensor using an optical fiber |
| 05/14/2009 | US20090122644 Method and a System for Determining the Position of a Drill Bit |
| 05/14/2009 | US20090121720 Method for controlled source electromagnetic reconnaissance surveying |
| 05/14/2009 | US20090120691 Systems and methods for guiding the drilling of a horizontal well |
| 05/14/2009 | US20090120690 Borehole survey method and apparatus |
| 05/14/2009 | US20090120689 Apparatus and method for communicating information between a wellbore and surface |
| 05/14/2009 | US20090120637 Tagging a Formation for Use in Wellbore Related Operations |
| 05/14/2009 | US20090120634 Method for Tomographic Inversion by Matrix Transformation |
| 05/14/2009 | US20090119937 Method and system for heading indication with drift compensation |
| 05/13/2009 | EP2057347A1 Distributed intelligence for enhanced monitoring and control of oilfield processes |
| 05/13/2009 | CN201236699Y Memory type temperature and pressure integrated high-precision test device |
| 05/13/2009 | CN201236698Y Electronic down-hole well closing device |
| 05/13/2009 | CN201236697Y Coal mine mash gas discharging drilling depth measuring apparatus |
| 05/13/2009 | CN201236696Y External optical fiber sensor down-hole positioning device of oil water well casing tube |
| 05/13/2009 | CN201236695Y Portable oil well parameter synthetic test system |
| 05/13/2009 | CN201236694Y Total hydrocarbon intelligent logging instrument |
| 05/13/2009 | CN201236693Y Rotating halter apparatus |
| 05/13/2009 | CN201236651Y Feeding and salvaging tool of electronic single/multi-point measurement instrument suitable for gas drilling |
| 05/13/2009 | CN101430402A Hydrocarbon monitoring cable |
| 05/13/2009 | CN101429865A Parameter-embedded analog transducer calibration method |
| 05/13/2009 | CN101429864A Caber type oil gas well perforating test technique |
| 05/13/2009 | CN100487427C Determining fluid properties from fluid analyzer |
| 05/13/2009 | CN100487374C Contra rotating positioning mechanism for eliminating dynamic regulating gyroinclinometer inertia device constant value error |
| 05/13/2009 | CN100487221C Holder for high-temperature high-pressure glass microscopic model |
| 05/12/2009 | US7532540 Fluid erosion protection washer for rotating shaft in MWD tool |
| 05/12/2009 | US7532129 Apparatus and methods for conveying and operating analytical instrumentation within a well borehole |
| 05/12/2009 | US7530392 Method and system for development of hydrocarbon bearing formations including depressurization of gas hydrates |
| 05/12/2009 | CA2499272C Simultaneous resolution enhancement and dip correction of resistivity logs through nonlinear iterative deconvolution |
| 05/12/2009 | CA2485026C Formation testing while drilling data compression |
| 05/12/2009 | CA2482912C System and method for interpreting drilling data |