| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 12/23/2009 | CN201367898Y 31-core flexible joint |
| 12/23/2009 | CN201367897Y Hydraulic oil volume compression coefficient test device |
| 12/23/2009 | CN201367896Y Logging winch intelligent safety control system |
| 12/23/2009 | CN201367895Y Multi-phase compensating drilling electric resistivity well measuring apparatus |
| 12/23/2009 | CN101611300A An apparatus for leakage testing and/or pressure testing of a portion of a pipe and also a method for use of same |
| 12/23/2009 | CN101611211A Method and apparatus for collecting drill bit performance data |
| 12/23/2009 | CN101608544A Hydraulic pressure elimination device and hydraulic pressure elimination method for pressure measurement of descending hole coal bed gas |
| 12/23/2009 | CN100572748C Method and system for circulating fluid in a well system |
| 12/23/2009 | CN100572740C Assemblage control system and method for establishing threaded connection |
| 12/23/2009 | CA2728414A1 Flow line electric impedance generation |
| 12/23/2009 | CA2728413A1 Control of sub surface safety valves |
| 12/22/2009 | US7635033 Downhole abrading tool having taggants for indicating excessive wear |
| 12/22/2009 | US7634946 Testing of bottomhole samplers using acoustics |
| 12/22/2009 | CA2585080C Methods and systems for reverse-circulation cementing in subterranean formations |
| 12/22/2009 | CA2538307C Downlink telemetry system |
| 12/22/2009 | CA2487384C A method and apparatus for high speed data dumping and communication for a downhole tool |
| 12/22/2009 | CA2480813C Apparatus and method for resistivity measurements during rotational drilling |
| 12/17/2009 | WO2009152498A2 Using models for equilibrium distributions of asphaltenes in the presence of gor gradients to determine sampling procedures |
| 12/17/2009 | WO2009152341A2 Vector migration of virtual source vsp data |
| 12/17/2009 | WO2009152014A2 Apparatus and system for geosteering and formation evaluation utilizing improved antennas |
| 12/17/2009 | WO2009151954A2 Method of measuring multiphase flow |
| 12/17/2009 | WO2009151937A2 Layer stripping method |
| 12/17/2009 | WO2009151867A2 Multiple magnetic sensor ranging method and system |
| 12/17/2009 | WO2009151851A2 Wellbore instrument module having magnetic clamp for use in cased wellbores |
| 12/17/2009 | WO2009151835A1 Magnetic ranging and controlled earth borehole drilling |
| 12/17/2009 | WO2009151822A1 Measurement of formation parameters using rotating directional em antenna |
| 12/17/2009 | WO2009151449A1 Method and system of determining an electrical property of a formation fluid |
| 12/17/2009 | WO2009151444A1 Method and system of transmitting electromagnetic waves from a wellbore |
| 12/17/2009 | WO2009151350A1 Well flaw detection system (embodiments) |
| 12/17/2009 | WO2009126572A3 A method and apparatus for sampling and/or testing downhole formations |
| 12/17/2009 | WO2009120816A3 Determination of irreducible water cut-off using two dimensional nuclear magnetic resonance data |
| 12/17/2009 | US20090308656 High power umbilicals for subterranean electric drilling machines and remotely operated vehicles |
| 12/17/2009 | US20090308616 Method and Apparatus for a Monodiameter Wellbore, Monodiameter Casing, Monobore, and/or Monowell |
| 12/17/2009 | US20090308605 Methodolgy and apparatus for programmable robotic rotary mill cutting of multiple nested tubulars |
| 12/17/2009 | US20090308602 Combined three-in-one fracturing system |
| 12/17/2009 | US20090308601 Evaluating multiphase fluid flow in a wellbore using temperature and pressure measurements |
| 12/17/2009 | US20090308597 Pressure and Friction Reducing Flow Adapter |
| 12/17/2009 | US20090308152 Christmas tree with internally positioned flowmeter |
| 12/17/2009 | US20090308151 Christmas tree with internally positioned flowmeter |
| 12/17/2009 | CA2727616A1 Magnetic ranging and controlled earth borehole drilling |
| 12/17/2009 | CA2727610A1 Multiple magnetic sensor ranging method and system |
| 12/17/2009 | CA2719651A1 Method and system of transmitting electromagnetic waves from a wellbore |
| 12/17/2009 | CA2718784A1 Layer stripping method |
| 12/16/2009 | EP2132409A1 Apparatus, system, and method for determining injected fluid vertical placement |
| 12/16/2009 | EP2132400A1 Drill bit assembly and method of performing an operation in a wellbore |
| 12/16/2009 | CN201363141Y Hydraulic control system used for tightness testing device of drilling blowout preventer |
| 12/16/2009 | CN201363140Y Mechanical capillary temperature measurement device |
| 12/16/2009 | CN201363139Y Major-diameter hole deflection measurement centering device |
| 12/16/2009 | CN201363138Y Multi-frequency orientation inducting electrical resistivity measuring instrument while drilling |
| 12/16/2009 | CN201363137Y Borehole compensation electromagnetic wave resistivity measurement device while drilling |
| 12/16/2009 | CN201363094Y Pipe nipple with filling and temperature-pressure measurement connection pipes |
| 12/16/2009 | CN101603422A Device for measuring longhole depth and method thereof |
| 12/16/2009 | CN101603421A Gamma radiation logging along drilling method for petroleum drilling fluid |
| 12/16/2009 | CN101603420A Method and device for telemetering torque moment of drill stem |
| 12/16/2009 | CN101603419A Detection method of mine direct current method for coal face coal seam perspecitivity |
| 12/16/2009 | CN101603418A Automatic monitoring system of abrasion of petroleum casing pipe |
| 12/16/2009 | CN100570335C Method and apparatus for a downhole refractometer and attenuated reflectance spectrometer |
| 12/15/2009 | US7631698 Depth control in coiled tubing operations |
| 12/15/2009 | US7631693 Retrievable plug system and methods of use |
| 12/15/2009 | CA2476396C Pressure controlled fluid sampling apparatus and method |
| 12/15/2009 | CA2401668C Power generation using batteries with reconfigurable discharge |
| 12/15/2009 | CA2399132C Combined logging and drilling system |
| 12/10/2009 | WO2009149038A2 Systems and methods for providing wireless power transmissions and tuning a transmission frequency |
| 12/10/2009 | WO2009148871A2 Resistivity imager in non-conductive mud for lwd and wireline application |
| 12/10/2009 | WO2009146895A2 Drill head |
| 12/10/2009 | WO2009146560A1 Contactless position detection switch |
| 12/10/2009 | WO2009146548A1 System and method for determining downhole positions |
| 12/10/2009 | WO2009129386A3 Steering device for downhole tools |
| 12/10/2009 | WO2009117424A3 Micro-annulus detection using lamb waves |
| 12/10/2009 | WO2009111412A3 Monitoring downhole conditions with drill string distributed measurement system |
| 12/10/2009 | US20090306897 Methods and apparatus to detect contaminants on a fluid sensor |
| 12/10/2009 | US20090301782 Methods and apparatus to determine and use wellbore diameters |
| 12/10/2009 | US20090301779 Earth boring device |
| 12/10/2009 | US20090301778 Method and system for tracking lubricant leakage from downhole drilling equipment |
| 12/10/2009 | US20090301715 Single Packer System For Use In A Wellbore |
| 12/10/2009 | US20090301714 Composition and Method For Using Waxy Oil-External Emulsions To Modify Reservoir Permeability Profiles |
| 12/10/2009 | DE102008026082A1 Borehole cable operating method, involves providing pressurized fiber-optic cable, enclosing measuring-technical and/or data transmitting fiber optic in fiber-optic cable, and rinsing borehole cable by flow of dried gases |
| 12/10/2009 | CA2746081A1 Contactless position detection switch |
| 12/10/2009 | CA2746078A1 System and method for determining downhole positions |
| 12/09/2009 | EP2129868A2 System and method for reservoir characterization using underbalanced drilling data |
| 12/09/2009 | EP2129867A1 Use of micro-electro-mechanical systems (mems) in well treatments |
| 12/09/2009 | CN201358783Y Pressure flow integrated seal checking device |
| 12/09/2009 | CN201358782Y Simple pipeline kinemometer |
| 12/09/2009 | CN201358781Y Theft-proof wellhead oil casing pressure device |
| 12/09/2009 | CN201358780Y Eccentric cylinder gear limit mechanical ground recorder for inclination measurement while drilling |
| 12/09/2009 | CN201358779Y Well logging headstall |
| 12/09/2009 | CN201358711Y Drilling rig with measurement while drilling function |
| 12/09/2009 | CN101600852A Automated MSE-based drilling apparatus and methods |
| 12/09/2009 | CN101598029A Ascending hole coal seam gas pressure measurement water pressure excluding instrument and method |
| 12/09/2009 | CN101598017A Device for measuring porosity of azimuth neutrons during drilling |
| 12/09/2009 | CN101598016A Depth multi-point correction method for horizontal positioning drill guide instrument |
| 12/09/2009 | CN101598015A High-precision measuring method for high-pressure well cementation slurry and device thereof |
| 12/09/2009 | CN101598014A Perforation simulated target device for high temperature and high pressure laboratory |
| 12/09/2009 | CA2668085A1 Backpressure valve for wireless communication |
| 12/08/2009 | US7628227 Measuring the weight on a drill bit during drilling operations using coherent radiation |
| 12/08/2009 | US7628203 Tracer injector tool for well investigation |
| 12/08/2009 | CA2527938C Tieback positioning and placement tool |
| 12/08/2009 | CA2524420C Wireless communications associated with a wellbore |
| 12/08/2009 | CA2522505C Method for determining a stuck point for pipe, and free point logging tool |
| 12/04/2009 | CA2776415A1 Interface for deploying wireline tools with non-electric string |