Design Optimization and Application of Hybrid Bit to Reduce a Well Cost in Geothermal Field
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Hybrid Bit, PDC Bit, UCS, Geothermal, Granodiorite
Abstract
Hybrid bit is one of the innovations developed for very hard and abrasive formations such as in geothermal field. This bit eliminates the risk of losing cones, reduces tripping time, and increaseas ROP to reduce the well cost. The stage of data processing by calculating the UCS formation using D-BOS software and design optimization based on 9-7/8" bits simulations in granodiorite formations. The 1st phase was to determine the 4 best out of 7 hybrid bit designs that were selected from the highest ROP obtained, the most stable cutter cutting force, and the lowest vibration by comparing the results of FEA modeling of 1 ft drilling simulation. The 2nd phase is to choose 1 of the best from the 4 selected by doing 50 ft of drilling dynamics simulation which is assessed by directional capability, the durability, and the lowest MSE. In this study to improve drilling optimization in geothermal field, it was found that the Z616 hybrid bit design was the most optimal one. Based on 1st phase simulation, this bit was able to produce ROP of 6.38 mph, a stable cutter cutting force, very low average lateral 2.109 g and axial vibration 0.329 g. Furthermore, for the 2nd phase simulation of 50 ft, seen from the comparison of directional capability, this bit has a 0.91 deg/100 ft DLS in rotating mode, and 6.5 deg/100ft DLS in sliding mode means quite stable when drilling in rotary mode and easy to make some angle in slide mode. By its durability, the average value of lateral acceleration is 10 g, and the lateral force is 6 klbf. By MSE side, this bit also produces the lowest average MSE value of 769 psi. From the economic view, this bit can save USD 198,625 - USD 564,712 of a well cost.
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References
Azar, M., Long, W., White, A., Copeland, C., Hempton, R., & Pak, M. (2015). A new approach to fixed cutter bits. Oilfield Review, 27(2), 30–35.
Bourgoyne Jr, A. T., Millheim, K. K., Chenevert, M. E., & Young Jr, F. S. (1991). Applied drilling engineering.
Finger, J., & Blankenship, D. (2010). Handbook of best practices for geothermal drilling. Sandia National Laboratories, Albuquerque.
Gunawan, F., Krisnanto, W., Mardiana, M. R., Noviasta, B., & Febriarto, H. B. (2018). Conical diamond element PDC bit as a breakthrough to drill hard geothermal formation in Indonesia. In IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition. Society of Petroleum Engineers.
Maitre, L. E. (1989). A classification of igneous rocks and glossary of terms. Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks, 193.
Noviasta, B., Napitupulu, G., Scagliarini, S., Centeno, M., Ardianto, D., Mardiana, M. R. Y., … Bao, J. F. (2017). Drilling Optimization in Hard and Abrasif Geothermal Volcanic Rock Using Innovative Conical Diamond Element Bit. In 38th New Zealand Geothermal Workshop.
Teale, R. (1965). The concept of specific energy in rock drilling. In International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (Vol. 2, pp. 57–73). Elsevier
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