Other

Sperry-sun, Inc.

Michael King Russell

Anthony William Russell

Inclination and high side angle of a borehole is measured by a tool that may be positioned inside a drill string and lowered into the borehole. The tool includes three gravity transducers positioned in a novel array. The transducers are positioned in a case whose axis coincides with that of the borehole and are arranged with their axes angularly displaced from each other around the case axis by approximately 120 degrees and from the case axis by approximately 45 degrees. An array of fluxgate magnetic transducers may be added to the apparatus to provide combination surveying and steering capability.

All angle borehole tool

An instrument for measuring the direction of a borehole in order to carry out a spatial survey thereof comprises a gyro-stabilized single-axis platform having its axis coincident with the axis of the borehole and three gravity sensors for measuring three components of gravity in the direction of the borehole axis and in two mutually perpendicular directions in a plane perpendicular to said axis.

Gyro-stabilized single-axis platform

A linear accelerometer comprises a proof mass in the form of a permanent bar magnet located in a tube containing a magnetic fluid such as a liquid with particles of magnetic material suspended therein. A servo circuit responsive to A.C. energized sensing coils is used to energize a D.C. electromagnet to maintain the proof mass in a central position in the tube.

Magnetic liquid supported linear accelerometer

The electrical power required to drive downhole drilling tools and/or measuring instruments is obtained using means responsive to turbulence in the mud flow past a unit forming part of the drill string. The responsive means may comprise a piezo-electric disc connected to rectifying and smoothing circuits whereby a D.C. output is obtained.

Power generation in underground drilling operations

Apparatus is provided for measuring both the angle between the vertical and a particular axis of a body and the azimuth angle of the displacement of such axis from the vertical. The body houses a trasnducer having a bar magnet mounted on the free end of a pendulum beam and confronting four solenoids forming two differential fluxgate pairs disposed symmetrically with respect to the neutral position of the pendulum beam. The two differential fluxgate pairs are preferably so interconnected that the magnetic flux in each fluxgate pair is equal to zero.

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Cheltenham, United Kingdom

Michael King Russell