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Hani, Berkah
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Chemical Engineering, Chemistry & Bioengineering Energy

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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.
Application of Bailer Technique for Idle Well Reactivation in Mature Fields: Case Study of SLF Field Sumatera Hani, Berkah; Sutresno, Wahyu
Scientific Contributions Oil and Gas Vol 48 No 4 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i4.1994

Abstract

This paper presents a field trial of wireline bailer cleanout to reactivate an idle oil well (SLL-06) in the mature SLF Field, South Sumatra Basin. The well had been shut in for several years due to severe debris accumulation and scale deposition. A low-capital bailer operation was used to remove wellbore obstructions and restore fluid communication. Eight successive bailer runs were conducted, and debris volume was quantified for each run. Results show a pronounced decline in recovered debris per run and an estimated cumulative removal of approximately 80% of the original obstruction. Post-cleanup measurements indicate a significant reduction in static fluid level of about 35% and a stabilized bottom-hole pressure (SBHP) profile, suggesting partial restoration of reservoir–wellbore connectivity. Following the intervention, the well resumed production at a low oil rate. A simplified economic assessment shows that the bailer operation required only 15–20% of the capital cost of a conventional workover. Under a conservative production assumption of approximately 30 bbl/d and an oil price of USD 70/bbl, the projected first-year revenue substantially exceeds the intervention cost. These findings confirm that wireline bailer cleanout is a technically practical and economically attractive first-step strategy for reactivating marginal wells where conventional artificial lift options are not economically viable.
Co-Authors Celli, Agli Tori Effendi, Dahrul Ghaziyah, Hawa Syuraih Herlambang, Karyanto Jumiati, Wiwiek Sutresno, Wahyu Syamsyida Rozi Syelly, Rosda Wibowo, Gilang Saputra Widia Yanti, Widia Wihdany, Falza Izza