TITLE:
A New Correction Algorithm of the Eccentric Ultrasonovision Time Image in the Casing Hole
AUTHORS:
Jihui Tu, Bin Yang
KEYWORDS:
BHTV, Ellipse Fitting, Image Correction, Tool Eccentricity
JOURNAL NAME:
Applied Mathematics,
Vol.5 No.10,
May
22,
2014
ABSTRACT: The ultrasonovision
image caused by the tool eccentricity can often present two pieces of vertical
black strips in the Casing Well. To solve this problem, this paper proposes a correction
algorithm of time eccentricity image based
on ellipse fitting algorithm. This algorithm firstly utilizes borehole diameter data to fit ellipse and compute ellipse’s center, major axis, minor axis and inclination angle and other parameters, and then uses these
parameters to correct eccentrical ultrasonovision time
image. The tested results show that the algorithm can accurately fit ellipse
and correct the eccentrical ultrasonovision time image, which is very important
practical significance on processing the well logging.