Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Reexamination Certificate
2008-05-27
2008-05-27
Bagnell, David J. (Department: 3672)
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
C175S073000, C324S346000, C324S207210, C166S066500
Reexamination Certificate
active
07377333
ABSTRACT:
Aspects of this invention include a downhole tool having first and second members disposed to translate substantially linearly with respect to one another. A magnet is deployed on the first member and a plurality of magnetic field sensors is deployed on the second member. The magnetic field sensors are spaced in a direction substantially parallel with a direction of translation between the first and second members. The tool typically further includes a controller disposed to determine a linear position of the first and second members with respect to one another from magnetic flux measurements made at the magnetic field sensors. Exemplary position sensor embodiments of the present invention are non-contact and therefore are not typically subject to mechanical wear. Embodiments of the invention therefore tend to advantageously provide for accurate and reliable linear position measurements.
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Chen, D.C.-K, Comeaux, B., Gillespie, G., Irvine, G., and Wiecek, B., “Real-Time Downhole Torsional Vibration Monitor For Improving Tool Performance and Bit Design,” IADC/SPE Drilling Conference, Feb. 21-23, 2006, Miami, Florida, SPE99193.
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Andrish Sean D
Bagnell David J.
PathFinder Energy Services, Inc.
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