This paper explains the basic concepts and techniques necessary in optimizing and improving a turbine/diamond bit drilling application. Recent turbine/diamond bit drilling experience in the Morrow Formation of the Anadarko Basin indicates that a linear relationship exists between penetration rate and turbine output power available at the bit. Turbine output power is a linear function of the mud weight but more importantly, it is a function of the flow rate raised to the third power; therefore, slight increases in flow rate will yield significant increases in turbine output power. The increased turbine output power allows a higher bit weight which normally results in an increased penetration rate. Actual field data is presented which supports these relationships. Since fluid flow rate is of primary importance this paper describes techniques for maximizing flow rate. The importance of lithology is also presented. Finally, turbine/ diamond bit drilling economic evaluation is described.

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