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CBL Log QualiQy Checks <br />Free Pine <br />A. Travel time indicating correct expected value for casing size and weight? <br />B. Travel time, magnetic collar locator, amplitude curve and variable <br />density/waveform all indicating casing collars on depth with each other? <br />C. Free pipe amplitude :reading correct value for casing size and weight? <br />D. E 1 arrival on variable density display indicating correct travel time to 5 <br />foot receiver, (i.e. 114 microseconds later than 3 foot receiver travel time)? <br />E. Collars on amplitude curve are 3 foot in vertical height and 5 foot on <br />VDL. This ensures amplitude and VDL/WF are measured on proper <br />receiver. <br />Cemented Pike <br />A. Travel time stretching or cycle skipping occumng in well bonded sections. <br />B. 100% and 70% bonded intervals consistent with minimum sonic <br />amplitude picked from CBL interpretation chart? <br />C. Is travel time less thsm free pipe value indicating eccentering or fast <br />formation ? <br />D. If eccenteringis expected, check V DL for chevron pattern at collars and _ <br />low CBL amplitudes. <br />E. If fast formation is stupected, i.e. open hole logs indicate delta T less than <br />57 microseconds per foot, check 1°` formation arrival on VDL/WF. If less <br />than expected free pipe value on 5 foot receiver, fast formation can be <br />confirmed. Note: pre-log planning will alert operator to presence of fast <br />formations. <br />F. Have log passes been run under sufficient pressure to eliminate Micro <br />annulus effect? <br />G. Does main log pass agree with repeat section? <br />H. Is main log pass properly correlated to open hole log? Note: if perforations <br />are picked from a pr<;ssure pass, make sure field personnel are aware of <br />