Abstract
ABSTRACT Since the CBL tool came into use over 30 years ago, Bond Index (BI) has been the most important parameter in interpreting a valid log. In recent years, more and more engineers started disbelieving the CBL because they found that the BI did not often tell the truth. Several investigators have been tackling this problem, but its complexity seems to have been overwhelming. Fundamental studies have been carried out in the BP Research centre, Sunbury UK. It was found that the BI was obscured by the "engineering treatment" of attenuation rates which does not have correct theoretical grounds or physical intuition. This paper analyses BI and its related topics, and derives the Bond Percentage Index (BPI) which is accurate and reliable in predicting the bond conditions. It is concluded that BPI is the correct description of reality and BI, being derived on false basis, should be abandoned.
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