Method of determining changes in well bore morphology

Details Method of determining changes in well bore morphology Method of determining changes in well bore morphology

E - Fixed Constructions

21

B

E21B 47/08 (2006.01) E21B 47/02 (2006.01) G01V 3/20 (2006.01)

Patent

CA 2154674

It consists in measuring, as a function of the depth of the borehole, the dip and the azimuth (a1) of the borehole, the inside diameters of the borehole in two perpendicular directions, and the azimuth (a2) of a reference caliper and it is characterized in that it consists in determining the eccentricity (em), together with an eccentricity error (.DELTA.em), the azimuth (a3) of the second caliper from the azimuth (a2), and the rotation speed (VR) of the reference caliper, and then comparing (.DELTA.em) to a threshold value (.DELTA.es) and (VR) to a threshold value (Vs) to determine the type of ovalization of the borehole.

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