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Scientific Contributions Oil and Gas
Published by LEMIGAS
ISSN : 20893361     EISSN : 25410520     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy
The Scientific Contributions for Oil and Gas is the official journal of the Testing Center for Oil and Gas LEMIGAS for the dissemination of information on research activities, technology engineering development and laboratory testing in the oil and gas field. Manuscripts in English are accepted from all in any institutions, college and industry oil and gas throughout the country and overseas.
Arjuna Subject : Energi (semua kategori) - Teknologi Bahan Bakar
Articles 22 Documents
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Search results for , issue "Vol 49 No 1 (2026)" : 22 Documents clear
A Decision-Oriented Techno-Economic Framework for Designing Fiscal Incentives in Horizontal Well Development of Marginal Oil Fields Achmad, Sudono; Prasetyo, Aries; Ramadhani, Najeela Faza
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.v49i1.2025

Abstract

Horizontal wells are widely recognized for improving reservoir contact and recovery; however, their application in marginal oil fields remains economically challenging due to high capital intensity and fiscal exposure. This study develops a decision-oriented techno-economic framework to evaluate the feasibility of horizontal well development under Indonesia’s Production Sharing Contract (PSC) regimes, namely PSC Cost Recovery and PSC Gross Split. Using a representative Indonesian marginal oil field, production forecasting, cost modeling, and cash-flow simulations are performed to assess project viability under Pessimistic, Moderate, and Optimistic Scenarios. Economic indicators, including Internal Rate of Return (IRR), Net Present Value (NPV), Payout Time (POT), and Government Take, are evaluated, followed by sensitivity and optimization analyses. The analysis confirms that PSC Cost Recovery consistently yields superior economic performance compared to PSC Gross Split, particularly for capital-intensive developments. Optimization results indicate that Contractor Split adjustment and CAPEX Efficiency are the most influential fiscal levers, while Investment Credit and First Tranche Petroleum (FTP) adjustments have a limited impact. This study identifies the quantitative incentive thresholds required to achieve a contractor Minimum Attractive Rate of Return (MARR) of 15%, offering practical guidance for policymakers and operators in structuring fiscal incentives for marginal field development. The findings provide a structured basis for aligning horizontal well deployment with fiscal policy to sustain upstream investment.
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.

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