| Patent Number |
Title Of Patent |
Date Issued |
| 4156467 |
Well drilling system |
May 29, 1979 |
| In a well drilling system, a drill bit is raised or lowered through formations surrounding a borehole in response to the movement of a cable onto and off of a drawworks drum. Magnetic markings are affixed to the drum, and a pair of sensors detect rotational movement of the magnetic m |
| 4147223 |
Logging-while-drilling apparatus |
April 3, 1979 |
| A logging-while-drilling apparatus having an asymmetrically efficient drive train for connecting a motor to a signal-generating rotary valve. The drive train includes a transmission which efficiently transmits torque from its input to its output but prevents the transmission of torque fr |
| 4114435 |
Well drilling system |
September 19, 1978 |
| In a well drilling system, a drill bit is raised or lowered through formations surrounding a borehole in a response to the movement of a cable onto and off the drawworks drum. Prior to drilling operations, the drilling system is calibrated by lowering the traveling block to its lowes |
| 4088154 |
Automatically controlled desurging system |
May 9, 1978 |
| A desurging system is placed in the fluid flow line near the output of a fluid pump to remove pressure fluctuations created in the flowing fluid by action of the fluid pump. The fluid passes through a gas-loaded, diaphragm type, fluid desurger. A gas volume control unit automatically con |
| 4001775 |
Automatic bit synchronization method and apparatus for a logging-while-drilling receiver |
January 4, 1977 |
| In a system for logging while drilling, an uphole receiver demodulates a received acoustic signal to produce a synchronously rectified signal with a polarity representative of the phase state of the acoustic signal. A detector produces a bit value pulse indicative of the phase state of t |
| 3968473 |
Weight-on-drill-bit and torque-measuring apparatus |
July 6, 1976 |
| Apparatus is provided for measuring weight and torque on the drill bit in a logging-while-drilling system. The upper end of the drill bit is adapted for slidable engagement with the lower end of the drill collar. Transducers are mounted with a cavity formed between the drill collar and |
