| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 08/03/1976 | US3973131 Pulsed neutron logging: multipurpose logging sonde for changing types of logs in the borehole without bringing the sonde to the surface |
| 08/03/1976 | US3972124 Device for measuring the length of a member |
| 07/13/1976 | US3968844 Determining the extent of entry of fluids into a borehole during drilling |
| 07/13/1976 | US3968694 Gauge for remotely indicating the pressure of a subterranean formation |
| 07/13/1976 | US3968691 Environmental condition sensing apparatus |
| 07/06/1976 | US3968473 Weight-on-drill-bit and torque-measuring apparatus |
| 06/29/1976 | US3967201 Wireless subterranean signaling method |
| 06/29/1976 | US3965983 Sonic fluid level control apparatus |
| 06/29/1976 | US3965978 Subsurface transient pressure testing apparatus and method of use thereof |
| 06/29/1976 | US3965736 Clamp-on transducer for well unit |
| 06/22/1976 | US3964556 Downhole signaling system |
| 06/22/1976 | US3964553 Borehole tool orienting apparatus and systems |
| 06/15/1976 | US3963654 Impression material for use in an impression packer |
| 06/15/1976 | US3963374 Well pump control |
| 06/08/1976 | US3961683 Method for determining the shape of an underground cavity and the position of the surface separating two media contained therein and device for carrying out said method |
| 06/08/1976 | US3961674 Directional drilling system |
| 06/08/1976 | US3961667 Hydraulically actuated wire line apparatus |
| 06/01/1976 | US3961308 Oil and gas well disaster valve control system |
| 06/01/1976 | US3960215 Method and apparatus for performing sequentially timed operations in a well |
| 06/01/1976 | US3960212 Method of obtaining impression information from a well |
| 06/01/1976 | US3960211 Gas operated hydraulically actuated wire line packer |
| 06/01/1976 | US3960015 Well flow sensing apparatus |
| 06/01/1976 | US3960014 Method of obtaining permeability information from an underground formation penetrated by a well |
| 05/25/1976 | US3959767 Data transmission system |
| 05/25/1976 | US3959647 Gamma-ray measuring method for determining an interface between media |
| 05/18/1976 | US3958217 Pilot operated mud-pulse valve |
| 05/18/1976 | US3958092 Apparatus for discriminating between liquid and gaseous flow |
| 05/11/1976 | US3955411 Method for measuring the vertical height and/or density of drilling fluid columns |
| 05/04/1976 | US3954006 Methods for determining velocities and flow rates of fluids flowing in well bore |
| 04/27/1976 | US3953777 Control circuit for shutting off the electrical power to a liquid well pump |
| 04/20/1976 | US3951209 Method for determining the pump-off of a well |
| 04/06/1976 | US3949354 Apparatus for transmitting well bore data |
| 03/23/1976 | US3945247 Percolation gauge |
| 03/09/1976 | US3942374 Apparatus for the determination of the quantity of oil |
| 03/09/1976 | US3942373 Well tool apparatus and method |
| 02/24/1976 | US3940689 Combined eddy current and leakage field detector for well bore piping using a unique magnetizer core structure |
| 02/24/1976 | US3939705 Removable downhole measuring instruments with electrical connection to surface |
| 02/24/1976 | US3939570 Apparatus for and process of determining overstress in pipe piles |
| 02/17/1976 | US3938910 Oil well pumpoff control system |
| 02/17/1976 | US3938383 Method and apparatus for detecting the thermal characteristics of a subsurface formation in situ |
| 02/17/1976 | US3938255 Cantilever-type inclinometer |
| 02/10/1976 | US3938129 Power line data transmission system |
| 02/03/1976 | US3936231 Oil well pumpoff control system |
| 02/03/1976 | US3935745 Pore water pressure measuring device |
| 02/03/1976 | US3935643 Methods of and means for measuring angles |
| 02/03/1976 | US3935642 Directional drilling of bore holes |
| 01/27/1976 | US3934467 Spinner flowmeter with isolated bearings |
| 01/27/1976 | US3934466 Resistance sensing free-point tool |
| 01/13/1976 | US3932836 DC/AC motor drive for a downhole acoustic transmitter in a logging-while-drilling system |
| 01/13/1976 | US3931735 Methods and apparatus for measuring the rate of penetration in well drilling from floating platforms |
| 01/06/1976 | US3930752 Oil well pumpoff control system utilizing integration timer |
| 01/06/1976 | US3930545 Tiltable coupling |