James V Leggett III, Vladimir Dubinsky, John W Harrell, William Thomas Balogh, Paul J G Seaton, Andrew G Brooks, Roger P Herbert: Drilling system with an acoustic measurement-while-driving system for determining parameters of interest and controlling the drilling direction. Baker Hughes Incorporated, Madan Mossman & Sriram P C, July 11, 2000: US06088294 (262 worldwide citation)

The present invention provides a system for drilling boreholes having a downhole subassembly which contains an acoustic measurement-while-drilling system. The acoustic system contains an acoustic transmitter and receiver for determining the acoustic velocity through the formations surrounding the bo ...

Joseph F Donovan, Roger P Herbert, Christopher L Gann, Michael H Johnson: Method of forming and servicing wellbores from a main wellbore. Baker Hughes Incorporated, Madan Mossman & Sriram P C, August 28, 2001: US06279658 (56 worldwide citation)

The present invention provides methods for forming multiple wellbores from a single location. A relatively large diameter main wellbore is drilled to a known depth. A plurality of spaced apart wellbores are formed from the bottom of the main wellbore, wherein at least one such wellbore is a producti ...

Roger P Herbert: Time recorder for in-hole motors. Smith International, Philip Subkow, June 14, 1983: US04387774 (3 worldwide citation)

Real time responsive devices are mounted at the inlet to an in-hole motor to measure the interval of time during which drilling fluid circulates through the motor.

Reese Jadwin, Roger P Herbert, Franklin L Schulte, Sheldon Rubin: Electronic stator measurement device. Smith International, Price Gess & Ubell, March 31, 1987: US04653318 (2 worldwide citation)

A device for measuring the cross section of the stator of a downhole motor having a carrier shaped to travel through the helicoidal interior of the stator and a sensor including first and second bending beam-strain gage structures for generating electrical signals indicative of the cross section of ...