| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 09/02/1980 | US4220205 Method of producing self-propping fluid-conductive fractures in rock |
| 09/02/1980 | CA1084836A1 Wireline shifting tool apparatus and method |
| 09/02/1980 | CA1084701A1 Linearly corrected articulated linkage for wellbore measuring instrument |
| 08/26/1980 | US4219773 Well casing finder instrument with movable magnet and magnetically operated switch |
| 08/26/1980 | US4218923 System for monitoring the condition of a pipeline |
| 08/20/1980 | EP0014204A1 Metal type detector for drill pipes. |
| 08/12/1980 | US4217659 Acoustic logging for examination of the cement bonding of well casing |
| 08/12/1980 | US4216590 Wide angle inclinometer |
| 08/05/1980 | US4216536 Transmitting well logging data |
| 08/05/1980 | CA1083033A1 Tubing tester valve apparatus |
| 07/29/1980 | US4215427 Carrier tracking apparatus and method for a logging-while-drilling system |
| 07/29/1980 | US4215426 Telemetry and power transmission for enclosed fluid systems |
| 07/29/1980 | US4215425 Apparatus and method for filtering signals in a logging-while-drilling system |
| 07/29/1980 | US4214374 Method of and apparatus for measuring the deviation of the center axis of bore holes and trenches relative to the design vertical center axis thereof |
| 07/22/1980 | US4213246 Collapsible and adjustable gage apparatus |
| 07/15/1980 | US4212198 Borehole pressure sensing system |
| 07/15/1980 | CA1081606A1 Process for determining the location and/or extent of rock cavities, especially of artificially generated rock cracks |
| 07/08/1980 | US4211974 Method for orienting a borehole core |
| 07/01/1980 | CA1080822A1 Well testing downhole tool apparatus and method |
| 06/24/1980 | US4208906 Mud gas ratio and mud flow velocity sensor |
| 06/24/1980 | CA1080323A1 Method and apparatus for providing repeatable wireline depth measurements |
| 06/17/1980 | US4207925 Reversible baffle plate |
| 06/17/1980 | US4207765 Method and apparatus for determining the point at which pipe is stuck in a well |
| 06/17/1980 | CA1079870A1 Behind casing fluid flow detection in producing wells using gas lift |
| 06/17/1980 | CA1079628A1 Tubing tester |
| 06/10/1980 | US4207619 Seismic well logging system and method |
| 06/10/1980 | US4206810 Method and apparatus for indicating the downhole arrival of a well tool |
| 06/03/1980 | US4205725 Method for forming an automatic burner for in situ combustion for enhanced thermal recovery of hydrocarbons from a well |
| 05/27/1980 | US4204426 Measuring casing coupler apparatus |
| 05/27/1980 | CA1078368A1 Downhole connector for use with drill string telemetering system |
| 05/20/1980 | CA1077827A1 Anchoring apparatus for tools used in determining the stuck point of a conduit in a borehole |
| 05/13/1980 | US4202490 Drill pipe identification method and system |
| 05/13/1980 | US4202410 Seal testing arrangement for wellheads |
| 05/13/1980 | CA1077321A1 Bore hole probe recording instrument |
| 05/13/1980 | CA1077259A1 Boring rig alignment apparatus and method |
| 05/06/1980 | CA1076953A1 Single well tracer method to evaluate enhanced recovery |
| 04/29/1980 | US4199869 Mapping apparatus employing two input axis gyroscopic means |
| 04/22/1980 | US4199680 Method of treating and logging wells |
| 04/22/1980 | US4199026 Method for detecting underground conditions |
| 04/22/1980 | US4198760 Double punch inclinometer |
| 04/22/1980 | CA1076231A1 Method and apparatus for providing repeatable wireline depth measurements |
| 04/17/1980 | WO1980000727A1 Improvements in and relating to electrical power transmission in fluid wells |
| 04/15/1980 | US4197654 Survey apparatus and method employing all latitude, all attitude gyrocompassing |
| 04/08/1980 | US4197456 Flowmeter for liquids |
| 04/08/1980 | US4196781 Telescoping joint |
| 04/08/1980 | US4196619 Geological assessment probe |
| 04/08/1980 | CA1075339A1 Down hole pressure/temperature gage connect/disconnect method and apparatus |
| 04/01/1980 | USRE30246 Methods and apparatus for driving a means in a drill string while drilling |
| 04/01/1980 | CA1074693A1 Apparatus for logging inclined earth boreholes |
| 03/25/1980 | US4195349 Self calibrating environmental condition sensing and recording apparatus |
| 03/25/1980 | CA1074292A1 Method and apparatus for telemetering information from a borehole to the surface |
| 03/25/1980 | CA1074103A1 Instrument for measuring the orientation of a borehole |
| 03/18/1980 | US4193307 Apparatus for indicating subsea well head pressure |
| 03/18/1980 | CA1073807A1 Method and apparatus for maintaining electric cable inside drill pipe |
| 03/11/1980 | US4192380 Method and apparatus for logging inclined earth boreholes |
| 03/11/1980 | US4192077 Survey apparatus and method employing rate-of-turn and free gyroscopes |
| 03/04/1980 | US4191250 Technique for cementing casing in an offshore well to seafloor |
| 03/04/1980 | CA1073081A1 Downhole pump speed control |
| 03/04/1980 | CA1072768A1 Pneumatic transducer for underground burial |
| 02/26/1980 | US4190868 Method and apparatus for automatically inscribing magnetic marks on a wireline |
| 02/19/1980 | US4189705 Well logging system |
| 02/19/1980 | US4189638 Water injection profiling by nuclear logging |
| 02/12/1980 | US4187912 Method and apparatus for pumping fluids from bore holes |
| 02/12/1980 | US4187908 Radioactive isotopes of potassium, thorium and uranium |
| 02/05/1980 | US4186494 Device for accurate measurement of the shape of a substantially cylindrical surface |
| 02/05/1980 | CA1071093A1 Methods and apparatus for determining the stuck point of a conduit in a borehole |
| 01/29/1980 | CA1070857A1 Detection of behind casing water flow at an angle to the axis of a well borehole |
| 01/29/1980 | CA1070517A1 Method and device for determining the pore water pressure in a soil |
| 01/22/1980 | US4185246 Circuit for reducing transients by precharging capacitors |
| 01/22/1980 | US4184548 Method for determining the position and inclination of a flame front during in situ combustion of an oil shale retort |
| 01/22/1980 | US4184546 Anchoring apparatus for tools used in determining the stuck point of a conduit in a borehole |
| 01/22/1980 | US4184545 Measuring and transmitting apparatus for use in a drill string |
| 01/22/1980 | CA1070438A1 Behind well casing water flow detection system |
| 01/22/1980 | CA1070106A1 Method and apparatus for leveling an instrument in a well bore |
| 01/08/1980 | CA1069431A1 System for logging highly deviated earth boreholes utilizing auxiliary sinker bar assembly |
| 01/01/1980 | US4181468 Geothermal energy pump monitor and telemetric system |
| 01/01/1980 | US4181176 Oil recovery prediction technique |
| 01/01/1980 | US4181014 Remote well signalling apparatus and methods |
| 01/01/1980 | CA1069114A Underreamer having cutter arm position indication |
| 01/01/1980 | CA1068899A Methods and apparatus for determining the stuck point of a conduit in a borehole |
| 12/25/1979 | US4179817 Method and apparatus for providing repeatable wireline depth measurements |
| 12/13/1979 | WO1979001099A1 Device for determining the pore water pressure in a soil |
| 12/11/1979 | US4178579 Remote instrumentation apparatus |
| 12/11/1979 | US4178567 Period-modulated voltage controlled oscillator |
| 12/11/1979 | US4178506 Method for detecting fractures in formations surrounding earth boreholes |
| 11/20/1979 | US4174628 Marine riser measuring joint |
| 11/20/1979 | US4174577 Borehole drift-direction probe |
| 11/06/1979 | US4173718 Method for monitoring fluid movement behind casing in oil and gas wells |
| 11/06/1979 | US4173255 Low well yield control system and method |
| 11/06/1979 | CA1065597A1 Borehole sensor with motor driven direction-sensing gimbals |
| 11/01/1979 | WO1979000855A1 Metal type detector |
| 10/30/1979 | CA1065502A1 Behind casing water flow detection using continuous oxygen activation |
| 10/30/1979 | CA1065246A1 Apparatus and method for well repair operations |
| 10/30/1979 | CA1065130A1 All angle borehole tool |
| 10/23/1979 | US4171642 Fluid producing formation tester |
| 10/23/1979 | US4171578 Borehole tool |
| 10/23/1979 | CA1065032A1 Control system for borehole sensor |
| 10/16/1979 | US4171185 Sonic pump off detector |
| 10/02/1979 | US4169979 Method and apparatus for measuring azimuth and speed of horizontal fluid flow by a borehole |
| 10/02/1979 | CA1063696A1 Damped pendulum angular position |