I ssues to be discussed in drill bit selection was to evaluate the use of thedrill bit on D-5 wells reference by using the method of Cost per Foot and SpesificEnergy, in order to get a bit which most economical for use on new wells, so thatoperations can run smoothly and economically. So the point of the selection is todetermine the drill bit appropriate and most economical for wells to be drilledusing Cost per Foot and Spesific Energy is the smallest value, as well asdetermine the optimal use of drilling parameters, which can produce themaximum penetration rate. Expected after choosing the optimal bit, drillingoperations can run safely, quickly and economically. Therefore it is necessary toevaluate the use of drill bits before performing drilling operations so thatsomething not desired can be minimized. The C-8 well which has the lowest CPFand SE on the PDC type penetrates the depth of 2165 ft which starts at a depth of2651 ft to 4816 ft. If compared with D-2, which uses a Rock Bit type drill tool thathas a lower SE but a high CPF causes the price of each penetrated foot to beexpensive. When compared from each foot penetrated by these two types of bits,namely on the C-8 with 2165 ft footage at a cost of 171.73 US $ / ft if multipliedthen the cost spent to penetrate 2165 ft is 371,795 US $, this value is onlycalculation of the price per track traversed