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(Atlas Wireline). <br />Shop calibrations aze required monthly or more frequently as needed. <br />A complete calibration sequence requires BEFORE and AFTER records, <br />including Signature (or V DL) and travel time calibrations. <br />SECOND-GENERATION RADIAL CEMENT EVALUATION INSTRUMENT <br />The Segmented Bond Tool (SBT) is a promising second-generation radial cement bond <br />instrument, which measures the quality of cement effectiveness both vertically and laterally <br />around the <br />circumference of the casing. The SBT is designed to quantitatively measure six segments, 60 <br />degrees each, aoound the pipe periphery. The instrument employs an array of high frequency <br />steered <br />transducers, which aze mounted on six pads. The instrument is capable of logging in casing sizes <br />from 4.5 inches to 13 3/8 inches with any type of fluid or gas occupying the borehole. A 5-foot <br />omnidirectional transmitter-receiver span is provided for Signature or Variable Density display. <br />The Segmented Bond Tool (SBT) examines not only the longitudinal cement quality, but also the <br />circumferential effectiveness of the cement sheath radially around the entire periphery of the <br />casing. <br />