| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 10/02/1979 | CA1063513A1 Casing collar indicator |
| 09/25/1979 | US4168747 Method and apparatus using flexible hose in logging highly deviated or very hot earth boreholes |
| 09/25/1979 | US4168746 Single well surfactant test to evaluate surfactant floods using multi tracer method |
| 09/25/1979 | CA1063009A1 Methods of determining well characteristics |
| 09/18/1979 | US4168483 System for detecting substructure microfractures and method therefor |
| 09/11/1979 | US4167111 Borehole geological assessment |
| 09/11/1979 | CA1062336A1 Electromagnetic lithosphere telemetry system |
| 09/11/1979 | CA1062147A1 Wireline latching apparatus and method of use |
| 09/04/1979 | US4167000 Measuring-while drilling system and method having encoder with feedback compensation |
| 09/04/1979 | US4166979 System and method for extracting timing information from a modulated carrier |
| 09/04/1979 | US4166500 Well logging method and apparatus using friction-reducing agents |
| 09/04/1979 | CA1061597A1 Method and device for pore pressure sounding |
| 09/04/1979 | CA1061592A1 Fluid interface measuring device for use in earth boreholes |
| 08/28/1979 | US4166216 Methods and apparatus for determining dynamic flow characteristics of production fluids in a well bore |
| 08/28/1979 | US4166215 Methods and apparatus for determining dynamic flow characteristics of production fluids in a well bore |
| 08/28/1979 | CA1061411A1 Method of transmitting signals from a drill bit to the surface |
| 08/21/1979 | US4164871 Push drill guidance indication apparatus |
| 08/07/1979 | US4163324 Surveying of boreholes |
| 08/07/1979 | CA1060114A1 System for telemetering well logging data |
| 07/31/1979 | CA1059650A1 Behind casing water volume flow rate measurement using concentric gamma ray detectors |
| 07/31/1979 | CA1059430A1 Closed system for testing the condition of well bore formations for cementing the production casing |
| 07/24/1979 | USRE30055 Apparatus for transmitting well bore data |
| 07/24/1979 | US4162400 Fiber optic well logging means and method |
| 07/17/1979 | US4161782 Microprocessor computerized pressure/temperature/time down-hole recorder |
| 07/17/1979 | US4161715 Method and apparatus for measuring the interior dimensions of a hollow body |
| 07/17/1979 | US4161687 Method for locating underground anomalies by diffraction of electromagnetic waves passing between spaced boreholes |
| 07/17/1979 | CA1058771A1 Resolution of through tubing fluid flow and behind casing fluid flow in multiple completion wells |
| 07/10/1979 | US4160970 Electromagnetic wave telemetry system for transmitting downhole parameters to locations thereabove |
| 07/10/1979 | CA1058331A1 Behind casing water flow detection using pulsed neutron oxygen activation |
| 07/03/1979 | US4159643 Method of and apparatus for measuring bottom hole well pressure |
| 07/03/1979 | US4159637 Hydraulic test tool and method |
| 06/26/1979 | US4158963 Process for determining the location and/or extent of rock cavities |
| 06/26/1979 | CA1057389A1 Method for distinguishing between single-phase gas and single-phase liquid leaks in well casings |
| 06/26/1979 | CA1057387A1 Method of and apparatus for telemetering information from a point in a well borehole to the earth's surface |
| 06/26/1979 | CA1057354A1 Surveying of subterranean magnetic bodies from adjacent off-vertical borehole |
| 06/19/1979 | CA1056808A1 Thrust and tension measuring device for use with flexible tubing injectors on drilling rigs |
| 06/12/1979 | US4157659 Oil well instrumentation system |
| 06/12/1979 | US4157619 Inclination and direction responsive apparatus |
| 06/12/1979 | CA1056454A1 Tracing flow of petroleum in underground reservoirs |
| 06/05/1979 | US4157535 Down hole pressure/temperature gage connect/disconnect method and apparatus |
| 06/05/1979 | US4157528 Wellbore pressure transducer |
| 05/29/1979 | US4156467 Well drilling system |
| 05/22/1979 | US4156229 Bit identification system for borehole acoustical telemetry system |
| 05/22/1979 | US4155403 Analyzing fluid flux in formation |
| 05/22/1979 | CA1055009A1 Apparatus for carrying out underground measurements during drilling of underground strata |
| 05/22/1979 | CA1054924A2 Methods and steam samplers |
| 05/22/1979 | CA1054910A1 Method of determining the relation between fractional flow and saturation of oil |
| 05/08/1979 | US4153112 Flex joint |
| 05/08/1979 | US4153109 Method and apparatus for anchoring whipstocks in well bores |
| 05/08/1979 | US4152926 Method and apparatus for testing the connections between pipe segments |
| 05/08/1979 | US4152924 Sub-sea equipment test and isolation tool |
| 04/24/1979 | US4151413 Method of measuring horizontal fluid flow behind casing in subsurface formations with sequential logging for interfering isotope compensation and increased measurement accuracy |
| 04/24/1979 | US4150578 Apparatus for measuring excess pore water pressure |
| 04/24/1979 | US4150568 Apparatus and method for down hole vibration spectrum analysis |
| 04/17/1979 | US4149593 Well testing tool system |
| 04/17/1979 | US4149592 Useful in oil shale retorts |
| 04/10/1979 | US4148529 Doping a retort to determine the locus of a processing zone |
| 04/10/1979 | US4148212 Method and device for determining the pore water pressure in a soil |
| 04/10/1979 | CA1052478A1 Behind casing water volume flow rate measurement using gamma ray spectral degradation |
| 04/10/1979 | CA1052450A1 Lock-in noise rejection circuit |
| 04/03/1979 | US4147223 Logging-while-drilling apparatus |
| 04/03/1979 | US4147222 Acoustical underwater communication system for command control and data |
| 03/20/1979 | US4144949 Bit positioning while drilling system |
| 03/13/1979 | US4143714 Method for monitoring underground fluid movement for improving recovery of oil or bitumen |
| 03/13/1979 | US4143546 Sucker rod pump dynamometer |
| 03/06/1979 | US4142411 Water well draw down monitoring system |
| 02/27/1979 | US4142148 Remote transducer monitoring system |
| 02/27/1979 | US4141153 Bottom hole survey apparatus |
| 02/13/1979 | US4139836 Wellbore instrument hanger |
| 02/13/1979 | US4138886 Method and apparatus to measure the rate of advance of a drilling tool on a floating drilling installation |
| 02/06/1979 | US4137968 Ignition system for an automatic burner for in situ combustion for enhanced thermal recovery of hydrocarbons from a well |
| 02/06/1979 | US4137762 Wireline apparatus for use in earth boreholes |
| 02/06/1979 | CA1048162A1 Pulsed neutron logging: multipurpose logging sonde for changing types of logs in the borehole without bringing the sonde to the surface |
| 01/30/1979 | US4137452 Radioactive tracers |
| 01/30/1979 | US4136737 Method for automatically initiating in situ combustion for enhanced thermal recovery of hydrocarbons from a well |
| 01/30/1979 | CA1047596A1 Methods and apparatus for recording well logging measurements |
| 01/23/1979 | US4136327 Well survey system modulation technique |
| 01/23/1979 | CA1047110A1 Rotation sensor for borehole telemetry |
| 01/16/1979 | US4134455 Oilwell tubing tester with trapped valve seal |
| 01/09/1979 | US4134100 Fluidic mud pulse data transmission apparatus |
| 01/09/1979 | US4133992 Self-purging electrical connector |
| 12/26/1978 | US4131815 Solid piezoelectric sand detection probes |
| 12/26/1978 | US4130942 Borehole surveying apparatus |
| 12/19/1978 | US4130169 Downhole connector for use with drill string telemetering system |
| 12/19/1978 | US4130162 Flow-through mule shoe sub |
| 12/19/1978 | US4130010 Bubble detector |
| 11/21/1978 | US4126848 Drill string telemeter system |
| 11/21/1978 | CA1042782A1 Well flow sensing apparatus |
| 11/14/1978 | US4125163 Method and system for controlling well bore fluid level relative to a down hole pump |
| 11/14/1978 | US4125027 Gauge for remotely indicating the pressure of a subterranean formation |
| 11/14/1978 | US4125013 Anchoring apparatus for tools used in determining the stuck point of a conduit in a borehole |
| 11/14/1978 | CA1042226A1 Gauge for remotely indicating the pressure of a subterranean formation |
| 11/07/1978 | US4124800 Method for determining residual oil saturation of a formation |
| 11/07/1978 | US4124547 Material for impression packer |
| 11/07/1978 | US4124070 Wireline shifting tool apparatus and methods |
| 11/07/1978 | US4123937 Methods of determining well characteristics |
| 11/07/1978 | CA1042103A1 Method and apparatus for measuring the rate of penetration in well drilling from floating platforms |
| 10/31/1978 | US4122898 Tubing tester |
| 10/24/1978 | US4121660 Well pressure test plug |
| 10/24/1978 | US4121657 Position indicator for downhole tool |