Selection of Drilling Bit for the 12 ¼” Holes in The Geothermal Wells at The Company of XYZ

Bambang Yudo Suranta, Akhmad Sofyan, Faridz Khoiriarta, Suka Handaja

Abstract


The selection of an appropriate drilling bit can reduce the cost of the drilling process per day. In the real case, drilling 12 ¼” holes in the geothermal wells having quartz formation at a company of XYZ uses three types of drilling bits, namely tungsten carbide insert (TCI) bit, polycrystalline diamond compact (PDC) bit, and Kymera hybrid bit. The purpose of this study was to determine the most suitable type of bit for drilling the 12 ¼” holes based on the parameters of the rate of penetration (ROP), evaluation of dull grading, cost per foot (CPF), and mechanical specific energy (MSE). The data of twelve wells having 12 ¼” holes were collected from the company. The results showed that PDC had a higher ROP (11.5 m/hour) than Kymera (10.5 m/hour) and TCI (7.5 m/hour). Furthermore, Kymera had a better dull grade (857 meterage) than PDC (838 meterage) and TCI (553 meters). Based on CPF analysis, the costs required for PDC, TCI, and Kymera were 122 USD/ft, 152 USD/ft, and 157 USD/ft, respectively. Based on MSE analysis, the energy needed for PDC, Kymera, and TCI was 295, 363, and 560 kpsi. Therefore, the most suitable bit type for 12 ¼” holes was PDC because it resulted in the highest ROP, the lowest CPF, the lowest MSE and almost the same dull grade value as Kymera

Keywords


Kymera bit, Selection of drilling bit, Polycrystalline diamond compact bit, Geothermal well, Tungsten carbide insert bit

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DOI (PDF): https://doi.org/10.20508/ijrer.v14i4.14417.g8946

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