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ROBUST DECLINE CURVE ANALYSIS Darwis, Sutawanir; Ruchjana, Budi Nurani; Permadi, Asep Kurnia
Journal of the Indonesian Mathematical Society Volume 15 Number 2 (October 2009)
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.15.2.50.105-111

Empirical decline curve analysis of oil production data gives reasonable answer in hyperbolic type curves situations; however the methodology has limitations in fitting real historical production data in present of unusual observations due to the effect of the treatment to the well in order to increase production capacity. The development ofrobust least squares offers new possibilities in better fitting production data using declinecurve analysis by down weighting the unusual observations. This paper proposes a robustleast squares fitting lmRobMM approach to estimate the decline rate of daily production data and compares the results with reservoir simulation results. For case study, we usethe oil production data at TBA Field West Java. The results demonstrated that theapproach is suitable for decline curve fitting and offers a new insight in decline curve analysis in the present of unusual observations.DOI :Â http://dx.doi.org/10.22342/jims.15.2.50.105-111

ROBUST DECLINE CURVE ANALYSIS Sutawanir Darwis; Budi Nurani Ruchjana; Asep Kurnia Permadi
Journal of the Indonesian Mathematical Society Volume 15 Number 2 (October 2009)
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.15.2.50.105-111

Empirical decline curve analysis of oil production data gives reasonable answer in hyperbolic type curves situations; however the methodology has limitations in fitting real historical production data in present of unusual observations due to the effect of the treatment to the well in order to increase production capacity. The development ofrobust least squares offers new possibilities in better fitting production data using declinecurve analysis by down weighting the unusual observations. This paper proposes a robustleast squares fitting lmRobMM approach to estimate the decline rate of daily production data and compares the results with reservoir simulation results. For case study, we usethe oil production data at TBA Field West Java. The results demonstrated that theapproach is suitable for decline curve fitting and offers a new insight in decline curve analysis in the present of unusual observations.DOI : http://dx.doi.org/10.22342/jims.15.2.50.105-111

Heterogeneity Effect on Polymer Injection: a Study of Sumatra Light Oil Romal Ramadhan; Adi Novriansyah; Tomi Erfando; Suparit Tangparitkul; Arik Daniati; Asep Kurnia Permadi; Muslim Abdurrahman
Scientific Contributions Oil and Gas Vol 46 No 1 (2023)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.46.1.1334

The production of oil and gas is heavily dependent on the heterogeneity of the reservoir. Optimizing the production plan and maximizing recovery from the reservoir depends on an understanding of how heterogeneity affects fluid flow and recovery. Techniques such as water flooding and polymer flooding were used to increase oil production from reservoirs while evaluating the impact of reservoir heterogeneity. Numerical simulations in homogeneous and heterogeneous models were performed in this research to identify the optimal operational parameters that will optimize oil recovery and assess the effect of heterogeneity in the reservoir on the recovery factor of the reservoir. The result showed that the homogeneous model obtained 59.86% of the oil recovery factor, while the heterogeneous reservoirs for Lk = 0.2, 0.4, and 0.6 resulted from 45.83%, 69.27%, and 80.46% of oil recovery after twenty years of production, respectively. The heterogeneous reservoir with Lk = 0.6 indicated the highest sweep efficiency compared to other scenarios, while the reservoir with Lk = 0.2 showed the lowest sweep efficiency

Kinetics of Dissolution and Wormhole Formation in Carbonate Rocks Using Lactic Acid: A Laboratory Study Berkah Hani; Asep Kurnia Permadi; Utjok W.R. Siagian; Harry Budiharjo
Scientific Contributions Oil and Gas Vol 48 No 2 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i2.1817

Matrix acidizing in carbonate reservoirs typically relies on hydrochloric acid (HCl), which reacts rapidly, causes equipment corrosion, and limits penetration depth. Laboratory experiments confirmed that lactic acid exhibits measurable reactivity with carbonate rocks under reservoir-representative conditions, with apparent first-order rate constants of 0.0841 min⁻¹ (0.05 M), 0.0814 min⁻¹ (0.10 M), and 0.0788 min⁻¹ (0.15 M) at 60 °C and 500 RPM. Moderate R² values (48–49%) suggest partial mass-transfer control and limited acid concentration sensitivity in this range. Arrhenius analysis between 60–90 °C yielded an activation energy of 63.8 kJ/mol, consistent with organic acid–carbonate reaction behavior. Core flooding experiments at 80 °C and 100 psi confirmed that injection rate significantly influences wormhole formation efficiency. Permeability increased from 2.54 mD to 6.25 mD. PVbt analysis revealed an optimal condition at 0.3 mL/min (PVbt ≈ 0.73), supporting dominant wormhole formation, while lower rates (0.1 mL/min, PVbt ≈ 2.7) led to uniform dissolution and higher acid consumption. Intermediate and high rates (0.5 and 0.9 mL/min) generated ramified/branching channels. Overall, the study demonstrates that bio-derived lactic acid is a safer, less corrosive, and environmentally responsible alternative to conventional HCl acidizing, offering well-defined kinetic parameters and validated injection strategies that support efficient wormhole development.

SOLUSI ANALITIK TYPE CURVES DAN UJI SENSITIVITAS MODEL RESERVOIR KOMPOSIT DENGAN BATAS LUAR RESERVOIR TERTUTUP UNTUK KASUS LAJU PRODUKSI SUMUR KONSTAN Wiwiek Jumiati; Asep Kurnia Permadi
Lembaran publikasi minyak dan gas bumi Vol 53 No 1 (2019)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.53.1.364

Type curve penurunan tekanan alir dasar lubang sumur sebagai fungsi waktu untuk mengkaji efek penurunan produksi reservoir, merupakan salah satu metode analisis kinerja reservoir yang sudah luas dikenal dan digunakan dengan praktis untuk berbagai kondisi di lapangan. Penelitian ini mengangkat aspek laju produksi konstan pada sumur dan tekanan batas terluar bounded no flow atau tertutup dari reservoir terbatas yang akan dilihat pengaruhnya terhadap laju penurunan tekanan. Kenyataan menunjukan bahwa laju produksi konstan di sumur dianggap lebih praktis dilakukan di lapangan. Ide awal ini berasal dari Turkidan Demski yang berhasil membuat type curve untuk model reservoir komposit pada kasus tekanan konstan di sumur. Type curves dibuat dari hasil penurunan secara analitis dari persamaan difusivitas untuk aliran fluida satu fasa untuk model reservoir komposit. Pada penelitian ini akan diperlihatkan bagaimana aplikasi dari type curve yang mewakili suatu model reservoir komposit dengan dua region dengan pengaruh parameter mobility ratio, storativity ratio, skin pada lubang sumur dan jari-jari discontinuity. Type Curves yang dihasilkan pada studi ini dapat digunakan untuk interpretasi log log type curve matching reservoir komposit dengan batas luar terbatas.

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