| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 06/16/1993 | CN1021243C Device for monitoring drilling |
| 06/15/1993 | US5219518 Nuclear oxygen activation method and apparatus for detecting and quantifying water flow |
| 06/11/1993 | CA2085028A1 Apparatus and method for communicating electrical signals in a well, including electrical coupling for electric circuits therein |
| 06/09/1993 | CN2135648Y Jaxtaposed layering pressure measuring pipe column |
| 06/09/1993 | CN2135647Y Multi-function electronic lighting hammer ball |
| 06/08/1993 | US5218301 Method and apparatus for determining distance for magnetic and electric field measurements |
| 06/08/1993 | US5217075 Method and device for carrying out interventions in wells where high temperatures prevail |
| 06/08/1993 | US5217072 Device for carrying out interventions in nonflowing deflected producing wells |
| 06/02/1993 | CN1072753A Measuring device of drilling azimuthal angle for measuring accompaning with drilling |
| 06/01/1993 | US5216638 Method and apparatus for the acoustic investigation of a casing cemented in a borehole |
| 06/01/1993 | US5216242 Apparatus for nuclear logging employing sub wall mounted detectors and modular connector assemblies |
| 06/01/1993 | US5215152 Rotating pulse valve for downhole fluid telemetry systems |
| 06/01/1993 | CA1318660C Articulated downhole instrument assembly for use in a drill string |
| 05/27/1993 | WO1993010329A1 Subsea well pressure monitor |
| 05/26/1993 | CN2134485Y Heavy hammer impact well instrument for well quake source |
| 05/25/1993 | US5214384 Method including electrical self potential measurements for detecting multiphase flow in a cased hole |
| 05/25/1993 | US5214251 Ultrasonic measurement apparatus and method |
| 05/25/1993 | US5213159 Method and apparatus for monitoring well fluid parameters |
| 05/25/1993 | CA1318244C Method and apparatus for operating equipment in a remote location |
| 05/22/1993 | CA2083483A1 Hydraulic system for electronically controlled pressure activated downhole testing tool |
| 05/19/1993 | EP0542584A1 Flexible tubing containing a centred line for transfer of energy or information and method of manufacturing such tubing |
| 05/19/1993 | EP0541804A1 System for supporting drive of excavating type underground digging machine |
| 05/19/1993 | CN2133668Y Rotary environmental monitoring well |
| 05/19/1993 | CN2133667Y 集流环 Slip ring |
| 05/19/1993 | CN1072238A Emulator of gradiometer |
| 05/18/1993 | US5212495 Composite shell for protecting an antenna of a formation evaluation tool |
| 05/18/1993 | US5212353 Transducer system for use with borehole televiewer logging tool |
| 05/18/1993 | US5212093 Method to determine drift and residual oil saturation |
| 05/18/1993 | US5211714 Wireline supported perforating gun enabling oriented perforations |
| 05/13/1993 | WO1993009405A1 Acoustic sand detector for fluid flowstreams |
| 05/13/1993 | CA2122826A1 Acoustic sand detector for fluid flowstreams |
| 05/12/1993 | EP0541425A2 Dipmeter apparatus and method for investigating earth formations |
| 05/12/1993 | CN2132830Y Well clockwork tester |
| 05/11/1993 | US5210533 Apparatus and method for positioning a tool in a deviated section of a borehole |
| 05/05/1993 | CN2131975Y Inclination determinating device for movable drilling rig |
| 05/04/1993 | US5208538 Apparatus having a pair of magnetic field generating cables for measuring position of an underground excavator |
| 05/04/1993 | US5207096 Advanced method and device for improving the production logs of an activated nonflowing well |
| 04/29/1993 | WO1993008368A1 Pressure pulse generator |
| 04/28/1993 | EP0539240A2 Measurement-while-drilling system |
| 04/27/1993 | US5205167 Method and apparatus for locating stratification in production fluid in a well |
| 04/27/1993 | US5205163 Method and apparatus for determining the torque applied to a drillstring at the surface |
| 04/27/1993 | CA1316702C Apparatus for the generation of pressure pulses in drilling mud compositions |
| 04/22/1993 | DE4134609A1 Druckimpulserzeuger Pressure pulse generator |
| 04/22/1993 | DE4133531A1 Deep well water regeneration - has pulsed flow of medium through the filter w.r.t. pH values and filter resistance with independent action on separate sections |
| 04/21/1993 | CN1071224A Measuring, alarming, tracing and transmitting in conjuction with drill |
| 04/20/1993 | US5204965 Data processing system using stream stores |
| 04/20/1993 | US5203418 Apparatus for guiding and steering earth boring casing |
| 04/20/1993 | CA1316589C Method of identification of well damage and downhole irregularities |
| 04/15/1993 | WO1993007514A1 System for real-time look-ahead exploration of hydrocarbon wells |
| 04/15/1993 | DE4133284A1 Monitoring pipe for rock bursts in mine - consists of pipe for insertion in borehole surrounded near mouth of hole by expanding sleeve holder |
| 04/14/1993 | EP0390835B1 A method for recording multi-phase flows through a transport system |
| 04/13/1993 | US5202944 Communication and power cable |
| 04/13/1993 | US5202680 System for drill string tallying, tracking and service factor measurement |
| 04/13/1993 | US5201375 Downhole drilling tool system |
| 04/13/1993 | US5201220 Apparatus and method for detecting the presence of gas in a borehole flow stream |
| 04/13/1993 | CA1316103C Diverter system test tool and method |
| 04/07/1993 | EP0535815A1 Pressure pulse generator for measurement-while-drilling tool |
| 04/07/1993 | EP0535729A2 Mud pump noise cancellation system |
| 04/07/1993 | EP0535153A1 An improved system for locating concealed underground objects |
| 04/07/1993 | CN2129338Y Special locking device for use in measuring of directional drilling |
| 04/06/1993 | US5200894 Method for processing echo sounding data collected from boreholes in the earth |
| 04/06/1993 | US5200705 Dipmeter apparatus and method using transducer array having longitudinally spaced transducers |
| 04/06/1993 | CA1315671C Instrument/tool positioning device |
| 04/03/1993 | CA2079649A1 Mud pump noise cancellation system |
| 04/01/1993 | WO1993006339A1 Downhole drilling data processing and interpreting device and method for implementing same |
| 03/31/1993 | EP0534338A2 Control system for a tunnel boring machine |
| 03/30/1993 | CA1315193C Preventing fines migration by producing from horizontal holes |
| 03/30/1993 | CA1315190C Method and apparatus for working or troubleshooting in a well |
| 03/24/1993 | EP0533526A1 Device for monitoring deposits for a production well |
| 03/24/1993 | EP0436017A4 Analyzing a hydrocarbon reservoir by determining the response of that reservoir to tidal forces |
| 03/23/1993 | US5195588 Apparatus and method for testing and repairing in a cased borehole |
| 03/23/1993 | CA1314970C Measurement of corrosion with curved ultrasonic transducer; rule-based processing of full echo waveforms; preprocessing and transmitting echo waveform information |
| 03/23/1993 | CA1314865C Weight-on-bit and torque measuring apparatus |
| 03/18/1993 | WO1993005600A1 Communications protocol for well-logging digital telemetry system |
| 03/18/1993 | WO1993005272A1 Apparatus for transmitting instrumentation signals over power conductors |
| 03/18/1993 | WO1993005271A1 Process and device for measuring cable drilled bores |
| 03/18/1993 | WO1993005270A1 Process for inhibiting scale formation in subterranean formations |
| 03/18/1993 | WO1993003255A3 Tubing test valve |
| 03/17/1993 | EP0531336A1 Double-tube core drill for inclined drilling. |
| 03/16/1993 | US5194859 Apparatus and method for positioning a tool in a deviated section of a borehole |
| 03/16/1993 | US5193628 Method and apparatus for determining path orientation of a passageway |
| 03/16/1993 | CA1314408C System for sensing ions in aqueous solution |
| 03/10/1993 | CN1069792A Chemical treatment process for adsorbing isotope of copper trichloricde |
| 03/04/1993 | DE4129252A1 High frequency control signal transfer arrangement along hollow earth boring rods - has signal transfer transformer windings on each end of pipe sections making up rod, with tuning capacitances in connecting leads of each pipe section |
| 03/03/1993 | EP0530045A1 Modulated bias units for steerable rotary drilling systems |
| 03/02/1993 | US5191326 Communications protocol for digital telemetry system |
| 03/02/1993 | US5191210 Produced steam survey device and method |
| 03/02/1993 | US5190103 Injecting surfactant into fluid to form pseudo-single phase fluid |
| 02/24/1993 | EP0528692A2 Transducer for measuring downhole pressure |
| 02/23/1993 | US5189645 Downhole tool |
| 02/23/1993 | US5189415 Receiving apparatus |
| 02/23/1993 | US5188191 Shock isolation sub for use with downhole explosive actuated tools |
| 02/23/1993 | US5188182 System containing expendible isolation valve with frangible sealing member, seat arrangement and method for use |
| 02/23/1993 | CA1313863C Pore pressure formation evaluation while drilling |
| 02/22/1993 | CA2076449A1 Buffer arrangement with back flushing of a quartz pressure transducer in a formation testing device |
| 02/18/1993 | WO1993003255A2 Tubing test valve |
| 02/18/1993 | CA2115247A1 Tubing test valve |
| 02/16/1993 | US5186579 Apparatus for controlling direction of underground excavator |
| 02/16/1993 | US5186255 Flow monitoring and control system for injection wells |
| 02/16/1993 | US5186048 To evaluate the fluids produced by pumping from a formation interval well |