| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 08/24/1989 | DE3828481A1 Vorrichtung zum einzementieren eines gehaeusestranges in einem bohrloch Apparatus for Cement in a gehaeusestranges in a borehole |
| 08/23/1989 | CN2043271U Non-linear bilateral well-prospecting instrument control equipment |
| 08/23/1989 | CN2043270U Well-prospecting cable bridle |
| 08/22/1989 | US4859151 Pump-off control for a pumpjack unit |
| 08/22/1989 | US4858718 Tube-wave attenuation method, system and apparatus for use with an inpulsive seismic energy source in liquid-containing wells |
| 08/22/1989 | US4858703 Self-propelled subsoil penetrating tool system |
| 08/15/1989 | US4858130 Estimation of hydraulic fracture geometry from pumping pressure measurements |
| 08/15/1989 | US4857831 Borehole casing diagnostic apparatus and method |
| 08/15/1989 | US4857729 Method of radioactive well logging |
| 08/15/1989 | US4857728 Method and apparatus for reducing radioactive hazards in well boreholes |
| 08/15/1989 | US4856595 Well tool control system and method |
| 08/15/1989 | US4856584 Method for monitoring and controlling scale formation in a well |
| 08/15/1989 | US4856344 Measuring flow in a pipe |
| 08/10/1989 | WO1989007223A1 Method of drilling a branch line aperture after internal lining of a pipeline and a water plug used in the method |
| 08/09/1989 | EP0272320A4 Homogeneous fluoroassay methods employing fluorescent background rejection. |
| 08/08/1989 | US4855965 Time ramped gain for borehole televiewer |
| 08/08/1989 | US4855820 Down hole video tool apparatus and method for visual well bore recording |
| 08/08/1989 | US4855732 System for the transmission of signals between a reception assembly lowered into a well and a central control and recording laboratory |
| 08/08/1989 | US4854398 Locating devices for soil displacement hammers |
| 08/08/1989 | US4854397 System for directional drilling and related method of use |
| 08/08/1989 | US4854164 Rod pump optimization system |
| 08/02/1989 | EP0326492A1 Device and method for carrying out operations and/or interventions in a well |
| 08/02/1989 | EP0326412A1 Method of drilling a branch line aperture after internal lining of a pipeline and a water plug used in the method |
| 08/02/1989 | CN1034405A Method and apparatus for subsurface formation evaluation |
| 08/01/1989 | US4853901 Automatic liquid level recording device |
| 08/01/1989 | US4853855 Dipmeter processing technique |
| 08/01/1989 | US4852668 Hydraulic drilling apparatus and method |
| 08/01/1989 | US4852665 Method for monitoring the operations of the rotary drilling of a well |
| 08/01/1989 | US4852401 Well fluid flow velocity measuring apparatus including a spinner cartridge assembly |
| 08/01/1989 | US4852394 Anti-extrusion sealing means |
| 08/01/1989 | US4852263 Method for determining cable length in a well bore |
| 07/27/1989 | WO1989006740A1 Shut-in tool |
| 07/26/1989 | EP0325338A2 Cable head shock isolation assembly |
| 07/26/1989 | EP0325047A2 Signal transmitters |
| 07/26/1989 | EP0324870A1 Self-steering drill string pipe for rotating drill strings of rock drilling machines |
| 07/26/1989 | EP0324778A1 Boring apparatus |
| 07/25/1989 | US4852070 Method and apparatus for transmitting and processing data from well logging tool |
| 07/25/1989 | US4852069 Thin bed evaluation device |
| 07/25/1989 | US4852052 Kelly-to-riser position determining system with adjustment for uncompensated heave |
| 07/25/1989 | US4852005 Method of computing formation dip and azimuth |
| 07/25/1989 | US4851665 System for sensing ions in aqueous solution |
| 07/25/1989 | CA1257794A1 Fiber optic connector assembly |
| 07/18/1989 | US4849753 Electro optic high temperature well bore modulator |
| 07/18/1989 | US4848463 Surface read-out tester valve and probe |
| 07/18/1989 | US4848456 Continuous brine leakage monitoring system for a production oil well |
| 07/18/1989 | US4848144 Method of predicting the torque and drag in directional wells |
| 07/12/1989 | EP0323773A2 Apparatus for subsurface formation evaluation |
| 07/11/1989 | US4847815 Sinusoidal pressure pulse generator for measurement while drilling tool |
| 07/11/1989 | US4846269 Apparatus for monitoring a parameter in a well |
| 07/11/1989 | US4845990 Ultrasonic mine survey probe |
| 07/11/1989 | US4845981 System for monitoring fluids during well stimulation processes |
| 07/11/1989 | CA1257329A1 Method and means for obtaining data representing a parameter of fluid flowing through a down hole side of an oil or gas well bore |
| 07/04/1989 | US4845494 Method and apparatus using casing and tubing for transmitting data up a well |
| 07/04/1989 | US4845493 Well bore data transmission system with battery preserving switch |
| 07/04/1989 | US4845359 Methods and apparatus for safely handling radioactive sources in measuring-while-drilling tools |
| 07/04/1989 | US4844161 Locking orientation sub and alignment housing for drill pipe conveyed logging system |
| 06/29/1989 | WO1989005974A1 A method for recording multi-phase flows through a transport system |
| 06/29/1989 | DE3741717A1 Vorrichtung zum niederbringen von im wesentlichen vertikalen bohrungen Apparatus for bringing down of substantially vertical holes |
| 06/28/1989 | CN1033533A Load-modulating telemetry method and apparatus |
| 06/27/1989 | US4842207 Device for detecting and measuring the tension on a cable |
| 06/27/1989 | US4842064 Well testing apparatus and methods |
| 06/21/1989 | EP0321198A1 Radioactive shaped charges and method for well perforating |
| 06/21/1989 | EP0321197A1 Well logging using radioactive tracers |
| 06/21/1989 | CN2039740U Temp. and pressure simultaneously measuring instrument |
| 06/20/1989 | US4840292 Method and apparatus for dispensing oil well proppant additive |
| 06/20/1989 | CA1256209A1 Self-contained downhole guage system |
| 06/20/1989 | CA1256017A1 Method and apparatus for displacing logging tools in deviated wells |
| 06/15/1989 | WO1989005391A1 Device for drilling essentially vertical boreholes |
| 06/15/1989 | DE3740700A1 Measuring method for locating drilling obstacles and foreign bodies in the ground |
| 06/14/1989 | EP0320135A1 Method and apparatus for operating equipment in a remote location |
| 06/14/1989 | EP0320039A1 Apparatus for measuring differential pressure while drilling |
| 06/14/1989 | CN1033405A Method for determining the dip and direction of formation fracture intersecting borehole |
| 06/13/1989 | US4839870 Pressure pulse generator system for measuring while drilling |
| 06/13/1989 | US4839644 System and method for communicating signals in a cased borehole having tubing |
| 06/13/1989 | US4838349 Apparatus for testing selected zones of a subterranean bore |
| 06/13/1989 | US4838079 Multi-channel pipe for monitoring groundwater |
| 06/13/1989 | CA1255651A1 Steering and control system for percussion boring tools |
| 06/07/1989 | EP0319527A2 Apparatus for providing an underground tunnel |
| 06/07/1989 | EP0319117A2 A method for determining the dip and direction of a formation fracture intersecting a borehole |
| 06/06/1989 | US4836305 Drill pipes and casings utilizing multi-conduit tubulars |
| 06/06/1989 | US4836288 Casing hanger and packoff running tool |
| 06/06/1989 | US4836017 Method and apparatus for determining oil content of oil well production |
| 06/06/1989 | CA1255375A1 Verification of a surface controlled subsurface actuating device |
| 06/06/1989 | CA1255358A1 Well bore data transmission system |
| 06/01/1989 | WO1989004909A1 Apparatus and method for measuring borehole deviation |
| 05/31/1989 | EP0318471A1 Pitch angle monitoring arrangement |
| 05/31/1989 | EP0318343A2 Methods and apparatus for safely handling radioactive sources in measuring-while-drilling tools |
| 05/30/1989 | US4834196 Well drilling tool |
| 05/30/1989 | US4833914 Pore pressure formation evaluation while drilling |
| 05/30/1989 | US4833787 High speed well surveying and land navigation |
| 05/24/1989 | EP0316448A1 Control unit for underground excavators |
| 05/24/1989 | CN2038150U Logarithm proportion and dotted line recording device for well logging |
| 05/23/1989 | US4833321 Process for installing a probe for monitoring the position of an interface between two fluids and means for implementing said process |
| 05/23/1989 | US4833320 High-temperature well logging instrument with plastic scintillation element |
| 05/23/1989 | US4832121 Methods for monitoring temperature-vs-depth characteristics in a borehole during and after hydraulic fracture treatments |
| 05/23/1989 | CA1254501A1 Tensile ring cable head assembly |
| 05/23/1989 | CA1254500A1 Downhole recorder for use in wells |
| 05/18/1989 | WO1989004497A1 Measurement of corrosion with curved ultrasonic transducer; rule-based processing of full echo waveforms; preprocessing and transmitting echo waveform information |
| 05/18/1989 | WO1989004418A1 Self-propelled subsoil penetrating tool system |
| 05/17/1989 | CN2037775U Wellpipe-installing collimator |