Method and apparatus for correcting MWD porosity measurement

Details Method and apparatus for correcting MWD porosity measurement Method and apparatus for correcting MWD porosity measurement

1993-09-22

1994-10-25

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

250264, 250266, 166250, E21B 4708, E21B 4900, G01V 504

Patent

active

053577973

ABSTRACT:
A porosity measuring MWD system utilizing a source and two detectors is set forth. The source and two detectors are preferably mounted in a stabilizer fin on a drill collar. A standoff measuring device is also included. Dependent on dynamically measured standoff, output pulses from the two detectors are input to storage counters; different counters are selected for different ranges of standoff. Porosity measurements are determined from the counts for variations in standoff measurements; this provides a near/far ratio for ranges of standoff; as the standoff range varies, the counts are directed to different counters. Near/far ratios are determined and represent the apparent porosity; a corrected value of porosity is then determined for each particular range of standoff.

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