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CONTENTS
Points to Ponder
The chapter above lists the cases in which Gyros are the only option for such things as measuring inside casing or drill pipe. But I would argue that running gyros should be standard practice to ensure an independent check on surveys. The resolution of gyro surveys (shorter intervals) is also invaluable in defining the true trajectory delivered. The cost of running a drop gyro in top hole where collision risk is highest is more than justified against the cost of lost production if the uncertainty envelopes come too close. s lsopossbl ocombn gy o ndMW su ys noon ‘b s f ’su ywhchwllh sm ll unc ny envelope than either of the original survey. But be careful how you interweave your observations because any small changes in azimuth over very short intervals may appear as high doglegs. It is better to apply a rolling polynomial smoothing of inclination and azimuth using the two surveys as inputs. (Only do this if you are a certified geek).
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