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.
Highlights
The principle of ultrasound imaging logging technique is to image the surface of the wall by the amplitude and time of ultrasonic echo after the emission of ultrasound to the wall perpendicularly through a rotating energy transducer
Since instrument eccentricity is a common occurrence in practical logging process, it is of great significance to find a method to eliminate such dark bands
In order to solve the problem of dark bands caused by instrument eccentricity, this paper presents a correction algorithm for eccentric time image based on ellipse fitting method
Summary
The principle of ultrasound imaging logging technique is to image the surface of the wall by the amplitude and time of ultrasonic echo after the emission of ultrasound to the wall perpendicularly through a rotating energy transducer. In order to solve the problem of dark bands caused by instrument eccentricity, this paper presents a correction algorithm for eccentric time image based on ellipse fitting method. The experimental results show that the algorithm is capable of eliminating the dark bands and making the information of the casing surface displayed more clearly. This is of great value for the practical processing of logging data. In the case of a down hole instrument eccentric ultrasonic television image can no longer completely correctly reflect the acoustic impedance characteristics of the wall of well, the echo wave time cannot reflect the size of the well radius, which affects the interpretation and judgment of logging image
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