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Aioo = Amplitude at 100% bond~(mV) <br />EXAMPLE• <br />As an example, consider a bond log showing the following <br />conditions: <br />- Free pipe (0% bond) amplitude at 81 mV, <br />- 100 % bond amplitude at 1 mV. <br />Substituting the above values into the equation results in: <br />A = 10~(a.2>~og(81>+(0.8)l09(~)l <br />80 <br />A80= 2.41 mV <br />Another way to calculates the amplitude at 80% bond is by <br />plotting these same log readings on a semi-log chart. <br />Plot the values for 0% Esond and 100% Bond vs. their <br />respective Amplitudes on a semi-log chart - amplitudes on <br />the log scale (y-axis), and bond indices on the linear scale <br />(x-axis). Then, cohnect: the points with a straight line. <br />To estimate the amplitude corresponding to an 80% Bond <br />Index, enter the graph on the x-axis at 80% bond. Draw a <br />straight line upward until you reach the diagonal line <br />connecting the 0% and 100% points. Continue by drawing a <br />horizontal line to the }~-axis. This point on the y-axis is <br />the amplitude corresponding to an 80% Bond Index. <br />PAn[ed on Recycled Paper <br />