Perpustakaan Digital ITB

In the petroleum industry, effective drilling is critical to profitability. The drillbit plays an important role in the rate of penetration and total drilling time, thus is one of the main factors in drilling costs. This paper examines drillbit efficiency using Cost per Foot (CPF) analysis in Well Alpha in the Bravo Structure of Charlie Field. An inventorization of data is performed resulting in the Final Well Report (FWR), Daily Drilling Reports (DDR), drilling parameter data in ASCII format, and bit records. It is stated that the 17.5" and 12.25" sections had an efficient CPF equal to $55.4/ft and $45.3/ft, respectively, whereas the 8.5" section had a higher CPF value of $119.5/ft. Roller Cone Bits (RCB) were not used for drilling the primary formation, and only Polycrystalline Diamond Compact (PDC) bits were used for drilling the formation in all sections. The conclusion is that the use of PDC bits in the 17.5", 12.25", and 8.5" sections was technically justified and was consistent with the engineering requirements. Recommendations are provided on how to improve the recording of future data, especially on trip times, bit histories, and dull grading.