Method and system for controlling vibrations in borehole equipme

Details Method and system for controlling vibrations in borehole equipme Method and system for controlling vibrations in borehole equipme

1991-02-20

1992-06-02

Britts, Ramon S.

Boring or penetrating the earth

Natural vibration characteristic of an element of boring...

254900, 367190, E21B 724

Patent

active

051179261

ABSTRACT:
Vibrations in borehole equipment are controlled by defining the energy flow through the equipment as the product of an "across" variable and a "through" variable, wherein fluctuations in one variable are measured and the energy flow is controlled by adjusting the other variable in response to the measured fluctuations in said one variable. Suitable variables for defining the energy flow are voltage times current of an electrical drive, pressure times flow rate of a hydraulic drive, or torque times angular velocity of any rotary drive.

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patent: 4878206 (1989-10-01), Grosso et al.
"Torque Feedback Used to Cure Slip-Stick Motion," by G. W. Halsey, A. Kyllingstad, and A. Kylling, SPE 18049, presented at 63rd Annual Technical Conference and Exhibition of the Society of Petroleum Engineers, held in Houston, Tex., Oct. 2-5, 1988.

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