ABSTRACT
Figure 12.14 is an example of a break-even curve sometimes used to predict bit performance. It is plotted from the data in Table 12.6. Generally, if the point describing anticipated diamond bit performance falls well above the basic breakeven curve, the diamond bit should be economical to use. If the point describing anticipated diamond bit performance falls below the curve, the bit should not be used because of doubtful economics. If the point describing anticipated diamond bit performance is very near the curve, either above or below it, then other factors, such as hole conditions, mud costs, rig wear, etc., should be carefully studied, because indirect savings they provide may influence the choice of bit.
