G - Physics – 01 – V
Patent
G - Physics
01
V
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G01V 3/26 (2006.01) E21B 47/022 (2006.01)
Patent
CA 1163325
METHOD AND APPARATUS FOR DETERMINING DIRECTION PARAMETERS OF A CONTINUOUSLY EXPLORED BOREHOLE ABSTRACT OF THE INVENTION Method and apparatus for continuously determining direction parameters of a borehole from the position of a well logging tool in the borehole during tool movement in the borehole, comprise a well logging tool including an accelerometer and a direction indi- cator, such as a magnetometer, with three sensitive axes respec- tively. Output signals derived from the accelerometer are prefiltered and then combined with respective output signals derived from the direction indicator in a manner so as to reduce to negligible proportions the effects of tool motion on respective ones of the output signals. The resulting signal is then subjected to a selective low-pass filtering, and the components thereof are thereafter, respectively combined with corresponding, suitable components of the original output signals in a manner such as to derive direction parameters for the borehole.
359426
Schlumberger Canada Limited
Smart & Biggar
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