Electricity: measuring and testing – Particle precession resonance – Using well logging device
Reexamination Certificate
2005-12-13
2005-12-13
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using well logging device
C324S300000
Reexamination Certificate
active
06975112
ABSTRACT:
A system and method for calculating the lateral velocity of a rotating drilling tool within a borehole, the system comprising: a pair of accelerometers placed oppositely across the drilling tool axis of rotation and two magnetometers. The method comprises: reading tool radial acceleration signals ar1, ar2, and tangential acceleration signals, at1and at3, obtained with a quadrature accelerometer detection system; reading Bxand By, the tool's magnetic phase data, from two orthogonally placed magnetometers; determining the rotational phase angle of the drilling tool relative to the earth's gravity field by first determining the tool's magnetic phase, and the phase shift between the tool's magnetic phase and gravity phase; and processing the foregoing data to yield a lateral tool velocity which optionally compensates for the effect of gravity on the accelerometers, or converts the lateral tool velocity from the tool reference frame to the borehole reference frame, or does both.
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Goodman George D.
Morys Marian
Prammer Manfred G.
Day Jones
Halliburton Energy Service,s Inc.
Shrivastav Brij B.
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