| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 02/02/2011 | CN101191413B High speed transmission method for down hole digital television data and transmission system thereof |
| 02/02/2011 | CN101105125B Down-hole vertical magnetic probe |
| 02/01/2011 | US7881155 Pressure release encoding system for communicating downhole information through a wellbore to a surface location |
| 02/01/2011 | US7880640 Wellbore communication system |
| 02/01/2011 | US7878269 Monitoring apparatus for core barrel operations |
| 02/01/2011 | US7878266 Downhole force measurement |
| 02/01/2011 | US7878250 System and method for automating or metering fluid recovered at a well |
| 02/01/2011 | US7878248 System, method, and apparatus for post-fracture treatment |
| 02/01/2011 | US7878242 Interface for deploying wireline tools with non-electric string |
| 02/01/2011 | US7877887 Method and system for heading indication with drift compensation |
| 02/01/2011 | CA2506056C Drilling a borehole |
| 02/01/2011 | CA2481921C Extended range emf antenna |
| 01/31/2011 | CA2711621A1 Rotating control device |
| 01/27/2011 | WO2011011610A2 Risk assesment for tools |
| 01/27/2011 | WO2011011512A2 Detector for characterizing a fluid |
| 01/27/2011 | WO2011011399A2 Slip ring apparatus for a rotary steerable tool |
| 01/27/2011 | WO2011010989A1 Estimating formation stresses using radial profiles of three shear moduli |
| 01/27/2011 | WO2011010101A2 Downhole apparatus and method |
| 01/27/2011 | WO2011010016A2 Drill pipe and corresponding drill fitting |
| 01/27/2011 | WO2010138961A3 Membrane for oil compensation |
| 01/27/2011 | WO2010138244A3 Estimating velocities with uncertainty |
| 01/27/2011 | WO2010114784A3 Methods for determining mechanical specific energy for wellbore operations |
| 01/27/2011 | WO2010096802A3 Method for accentuating signal from ahead of the bit |
| 01/27/2011 | WO2010091239A3 Method and apparatus for collecting drill bit performance data |
| 01/27/2011 | WO2008087281A3 Measuring system and method for a horizontal shaft |
| 01/27/2011 | US20110022318 High Resolution Sensor with Scalable Sample Rate |
| 01/27/2011 | US20110018733 Monitoring of Undesirable Fluid Ingress into Subsea Control Modules |
| 01/27/2011 | US20110017512 Instrumentation of appraisal well for telemetry |
| 01/27/2011 | US20110017473 Slip ring apparatus for a rotary steerable tool |
| 01/27/2011 | US20110017448 Zonal testing with the use of coiled tubing |
| 01/27/2011 | US20110017447 Method for evaluating shaped charge perforation test cores using computer tomograpic images thereof |
| 01/27/2011 | US20110016964 Device for Registration of Rotational Parameters During Assembly of a Pipe String |
| 01/27/2011 | US20110016963 Device for pressure testing of pipes |
| 01/27/2011 | DE112009000092T5 Untertage-Werkzeugzuführungssystem A downhole tool delivery system |
| 01/27/2011 | CA2768721A1 Slip ring apparatus for a rotary steerable tool |
| 01/27/2011 | CA2731780A1 Estimating formation stresses using radial profiles of three shear moduli |
| 01/26/2011 | EP2278122A2 Wideband mud pump noise cancellation method for well telemetry |
| 01/26/2011 | EP2278121A2 Monitoring of undesirable fluid ingress into subsea control modules |
| 01/26/2011 | EP2278119A2 Drifting tubing |
| 01/26/2011 | EP2278115A1 Extension for a drilling rod |
| 01/26/2011 | EP2278114A2 Apparatus and methods for drilling a wellbore using casing |
| 01/26/2011 | EP2278113A2 Apparatus and methods for drilling a wellbore using casing |
| 01/26/2011 | EP2278112A2 Apparatus and methods for drilling a wellbore using casing |
| 01/26/2011 | EP2278111A2 Apparatus and methods for drilling a wellbore using casing |
| 01/26/2011 | EP2276910A1 Formation evaluation using estimated borehole tool position |
| 01/26/2011 | CN201725215U Composite data acquisition terminal used for oil field and based on Loongson chip processor |
| 01/26/2011 | CN201723218U Drilling mud continuous wave generator |
| 01/26/2011 | CN201723217U Underground open-type seal checking device for pack-off strings |
| 01/26/2011 | CN201723216U Two-probe pressure gauge |
| 01/26/2011 | CN201723215U Unconfined well liquid level testing device using casing-head gas |
| 01/26/2011 | CN201723214U Simulation well device for water detector |
| 01/26/2011 | CN201723213U Weighing type gas-liquid two-phase flowmeter |
| 01/26/2011 | CN201723212U Automatic metering control system for oilfield metering station |
| 01/26/2011 | CN201723202U Pumping rod paraffin scraping and collar detecting device |
| 01/26/2011 | CN101960087A Systems and methods for well data analysis |
| 01/26/2011 | CN101957252A Experiment device for detecting sealing performance of swelling capsule and sealing liquid |
| 01/26/2011 | CN101956551A Detection device for oil pipe coupling |
| 01/26/2011 | CN101956550A Method for transmitting data by underground instrument |
| 01/26/2011 | CN101956549A Electromagnetic focusing sleeve screw thread logging instrument |
| 01/26/2011 | CN101050699B Method for obtaining thick oil layer vertical permeability using same layer vertical interference test well and test tubular pole |
| 01/25/2011 | US7877211 Downlink based on pump noise |
| 01/25/2011 | US7874381 Pneumatic line deicing system |
| 01/25/2011 | US7874362 Determination of downhole pressure while pumping |
| 01/25/2011 | US7874359 Methods of retrieving data from a pipe conveyed well logging assembly |
| 01/25/2011 | US7874357 Diagnosis of formation characteristics in wells |
| 01/25/2011 | CA2666291C Downhole depth computation methods and related system |
| 01/25/2011 | CA2484703C Apparatus for downhole measurements, and methods of using same |
| 01/25/2011 | CA2470512C Apparatus and methods for downhole determination of characteristics of formation fluids |
| 01/25/2011 | CA2426911C Tracking of particulate flowback in subterranean wells |
| 01/22/2011 | CA2703417A1 Instrumentation of appraisal well for telemetry |
| 01/20/2011 | WO2011009022A2 Method and apparatus of heat dissipaters for electronic components in downhole tools |
| 01/20/2011 | WO2011008707A2 Cancellation of vibration noise in deep transient resistivity measurements while drilling |
| 01/20/2011 | WO2011008471A2 Materials for use as structural neutron moderators in well logging tools |
| 01/20/2011 | WO2011008469A2 The use of solid crystals as continuous light pipes to funnel light into pmt window |
| 01/20/2011 | WO2011008468A2 Pulsed neutron based monitoring of co2 in enhnaced recovery and sequestration projects |
| 01/20/2011 | WO2011008405A2 Isotopic identification of production by individual formations in commingled gas wells |
| 01/20/2011 | WO2011007120A2 Methods for contacting a surface with a fluid containing a marker to determine the wettability of the surface |
| 01/20/2011 | WO2010129169A3 Standoff-independent resistivity sensor system |
| 01/20/2011 | WO2010123746A3 Televiewer image wood-grain reduction techniques |
| 01/20/2011 | US20110011581 System and Method for Servicing a Wellbore |
| 01/20/2011 | US20110011174 Retrievable downhole testing tool |
| 01/20/2011 | US20110011157 Gas chromatograph column with carbon nanotube-bearing channel |
| 01/19/2011 | EP2275642A1 System for detection and monitoring of deep land subsidence |
| 01/19/2011 | CN201714378U Acoustic system device for sonic logging |
| 01/19/2011 | CN201714377U Controllable signal emitter capable of being loaded with pseudorandom code |
| 01/19/2011 | CN201714376U Metering device capable of rapidly searching abnormal oil wells |
| 01/19/2011 | CN201714375U Internal pipe pressure measuring nipple while drilling |
| 01/19/2011 | CN201714374U Solid-liquid coupling one-off active-mode hole sealing pressure testing device |
| 01/19/2011 | CN201714373U Mining ultrasonic water level sensor |
| 01/19/2011 | CN201714372U Wireless sensor system used for well drilling field |
| 01/19/2011 | CN201714371U Fall prevention device for testing instrument |
| 01/19/2011 | CN201714370U Underground safety valve multifunctional detecting bracket |
| 01/19/2011 | CN201714369U Underground measurement while drilling fixing component of probe |
| 01/19/2011 | CN201714368U Oilfield well logging equipment box |
| 01/19/2011 | CN201714367U Automatic digital unattended multi-well measuring device |
| 01/19/2011 | CN201714366U Combined hydraulic testing frame adopting multi-section trusses |
| 01/19/2011 | CN201714365U High-temperature high-pressure perforation flow efficiency detection system |
| 01/19/2011 | CN201714331U Multifunctional convenient well head connector |
| 01/19/2011 | CN101952546A Compositions and methods for monitoring flow through fluid conducting and containment systems |
| 01/19/2011 | CN101952541A Ball dropping assembly and technique for use in a well |