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All Journal Journal of Earth Energy Science, Engineering, and Technology Scientific Contributions Oil and Gas
Sutresno, Wahyu
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Chemical Engineering, Chemistry & Bioengineering Energy

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Drilling Efficiency Analysis Using Drilling Specific Energy Approach: A Comparative Study of Wells RM-01 and RM-02 Ghani, Muhammad Hafiyyan; Setiati, Rini; Sutresno, Wahyu; Caesar, Athifa Putri
Journal of Earth Energy Science, Engineering, and Technology Vol. 8 No. 3 (2025): JEESET VOL. 8 NO. 3 2025
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/aq71r372

Abstract

Drilling operations represent the largest cost component in geothermal field development, particularly when penetrating abrasive volcanic formations that often reduce drilling efficiency and Rate of Penetration (ROP). In the RM geothermal field, the 12¼-inch hole section encounters hard volcanic rocks that pose operational challenges. This study aims to evaluate drilling efficiency and compare performance between wells RM-01 and RM-02 using the Drilling Specific Energy (DSE) approach. A quantitative comparative method was applied using historical drilling data from RM-01 and real-time drilling parameter data from RM-02, including Weight on Bit (WOB), Rotary Speed (RPM), Torque, and Rate of Penetration (ROP). DSE values were calculated using Teale’s specific energy equation and analyzed to identify inefficient drilling zones and evaluate the impact of hydraulic optimization. The results indicate that efficient drilling conditions were achieved only at shallower depths (1200 m in RM-01 and 1500 m in RM-02), where DSE values were relatively low. Hydraulic optimization reduced the average DSE by approximately 43 psi (0.18%) in RM-01 and 510 psi (1.01%) in RM-02, indicating improved drilling efficiency. However, DSE values at deeper intervals remained high, suggesting that formation strength and abrasiveness significantly affect drilling performance. The study is limited by the use of a limited number of wells and the focus primarily on hydraulic optimization without extensive analysis of other mechanical parameters such as bit design, vibration control, and broader lithological variability. Further research incorporating additional wells and integrated mechanical-hydraulic optimization is recommended to achieve more substantial improvements in drilling efficiency.
Effect of LHP Nanosilica on Sandstone Wettability and Oil Recovery by Imbibition in Crude Oils with Different API Jumiati, Wiwiek; Hani, Berkah; Yanti, Widia; Sutresno, Wahyu; Wihdany, Falza Izza; Ghaziyah, Hawa Syuraih; Herlambang, Karyanto; Celli, Agli Tori; Wibowo, Gilang Saputra
Scientific Contributions Oil and Gas Vol 49 No 1 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i1.2053

Abstract

This study investigates the influence of lipophobic–hydrophilic polysilicon (LHP) nanosilica on wettability alteration and oil recovery performance through spontaneous imbibition in initially neutral-wet sandstone. The novelty of this study lies in its systematic comparative framework using two crude oils with distinct API gravities and SARA compositions to evaluate the role of fluid–rock interactions in depth. Two crude oils with different API gravities were selected to evaluate the role of oil composition in fluid–rock interactions. Crude oil properties were characterized using SARA analysis, while imbibition tests were conducted using 5000 ppm brine and nanosilica dispersions at controlled concentrations. Wettability Index (WI) was determined using the Amott cell method, and Oil Recovery Factor (ORF) was calculated from produced oil volume. Results indicate that LHP nanosilica consistently shifts rock wettability toward more water-wet conditions. The lighter crude oil exhibits a stronger wettability response and higher recovery improvement than the heavier oil. A positive correlation between WI and ORF confirms wettability alteration as the dominant enhanced oil recovery mechanism. These findings provide a significant contribution by establishing crude oil characteristics as a key controlling factor in nanofluid EOR design, which is crucial for field applications with complex fluid variations.
Co-Authors Caesar, Athifa Putri Celli, Agli Tori Ghani, Muhammad Hafiyyan Ghaziyah, Hawa Syuraih Hani, Berkah Herlambang, Karyanto Jumiati, Wiwiek Rini Setiati Wibowo, Gilang Saputra Widia Yanti, Widia Wihdany, Falza Izza