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All Journal JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Petro : Jurnal Ilmiah Teknik Perminyakan Journal of Earth Energy Science, Engineering, and Technology Scientific Contributions Oil and Gas
Pri Agung Rakhmanto
Universitas Trisakti
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Industrial & Manufacturing Engineering Transportation

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KEEKONOMIAN LISTRIK PANAS BUMI Pri Agung Rakhmanto
PETRO:Jurnal Ilmiah Teknik Perminyakan Vol. 5 No. 2 (2016): Agustus
Publisher : Jurusan Teknik Perminyakan Fakultas Teknologi Kebumian dan Energi Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (161.718 KB) | DOI: 10.25105/petro.v5i2.2511

Abstract

Panas bumi merupakan sumber energi terbarukan yang sangat potensial untuk dikembangkan di Indonesia. Potensi energi panas bumi Indonesia tercatat 28.579 MW, namun baru termanfaatkan untuk pembangkit listrik sekitar 1.712,5 MW. Salah satu kendala terbesar di dalam pengembangan panas bumi untuk pembangkit listrik adalah tingkat keekonomian tarif listrik panas bumi. Tarif keekonomian yang ditetapkan pemerintah tidak selalu dapat menjamin keekonomian proyek listrik panas bumi yang ada. Paper ini mencoba melihat keekonomian tarif listrik panas bumi yang terbaru ditetapkan pemerintah. Simulasi perhitungan dilakukan untuk menghitung keekonomian proyek listrik panas bumi di suatu wilayah. Indikator keekonomian yang digunakan adalah Net Present Value (NPV), Internal Rate of Return (IRR), dan Pay Out Time (POT). Dari simulasi perhitungan yang dilakukan, ditemukan bahwa untuk dapat mencapai tingkat keekonomian yang layak perlu ada penyesuaian tarif listrik panas bumi yang ada.
Post Treatment Acidizing Study on Carbonate Rock with Wormhole Radius Method Ageng Warasta; Ratnayu Sitaresmi; Pri Agung Rakhmanto; Esaim Mustafa Abrahim Omar
Journal of Earth Energy Science, Engineering, and Technology Vol. 4 No. 1 (2021): JEESET VOL. 4 NO. 1 2021
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (446.045 KB) | DOI: 10.25105/jeeset.v4i1.9059

Abstract

The problem that generally occurs in production activities is that wells in producing conditions has a low production rate. This could be due to the low permeability value of the reservoir or the increase of the skin factor of the reservoir due to formation damage. This matrix acidizing stimulation method is considered as an effective method in terms of activity costs and the success ratio in carbonate rocks. One of the successes of increasing the permeability around the well area depends on how far the wormholes are formed around the well. The results showed that the fractal dimension and wormhole radius model approach can be used to analyze the post treatment skin effect after validating the field data. Further analysis was carried out by involving limestone and dolomite reservoirs which have different characteristics in terms of porosity, permeability and fractal dimensions. The two reservoirs require different volumes of acid injection to produce the same reduction in skin factor. In this research, it is found that the parameters of permeability ratio, fractal dimensions, acid concentration, rock porosity and type of lithology affect the post treatment skin factor.
Effect of Sand Grain Size on Spontaneous Imbibition of Surfactant Solution Pri Agung Rakhmanto; Listiana Satiawati; Rini Setiati; Asri Nugrahanti; Sonny Irawan
Journal of Earth Energy Science, Engineering, and Technology Vol. 4 No. 2 (2021): JEESET VOL. 4 NO. 2 2021
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (534.91 KB) | DOI: 10.25105/jeeset.v4i2.9419

Abstract

In spontaneous imbibition researches, surfactant has been employed to control interfacial tension (IFT) and wettability. In this paper, the evaluation of grain size effect on spontaneous imbibition of surfactant solution is presented. In this work, the synthetic porous media (sand packs) with uniform and non-uniform grain size from 30 mesh to 100 mesh were made. The porous media were initially saturated by oil. Then they were immersed in brine with salinity of 62 to 40,000 ppm for 24 hours. After that, the porous media were immersed in surfactant solution with concentration of 0.2% for another 24 hours. The total oil recovery during these treatments was measured. The experiment was separated into three parts in order to investigate the effect of uniform grains, non-uniform grains, and salinity in spontaneous imbibition. The results show that grain size and porosity were proportional to oil recovery. In the case of porous media with uniform grain size, the effect of grain size on recovery factor is stronger than that of porosity. Meanwhile the salinity has an the optimum condition for a maximum recovery factor. In this study, it happened at salinity of 20,000 ppm. Oil recovery factors observed in this study ranged from 66.7% to 91.1%.
Pengembangan Penelitian Biodiesel Menggunakan Analisis Bibliometrik Muhammad Taufiq Fathaddin; Aqlyna Fattahanisa; Shabrina Sri Riswati; Rini Setiati; Pri Agung Rakhmanto
JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Vol 7, No 1 (2023): Vol 7 No. 1 Tahun 2023
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ju.v7i1.984

Abstract

Masalah sektor energi di Indonesia saat ini adalah penurunan cadangan dan produksi minyak bumi serta kenaikan kebutuhan minyak yang berkelanjutan. Ketertarikan penggunaan biodiesel yang diperoleh dari sumber energi terbarukan terus meningkat. Dalam satu dekade terakhir, jumlah publikasi mengenai tema ini menunjukkan peningkatan. Penelitian ini bertujuan untuk mengamati perkembangan penelitian mengenai pemanfaatan bahan baku nabati menjadi bahan bakar biodiesel. Analisis bibliometrik terhadap berbagai publikasi mengenai biodiesel dilakukan untuk mendapatkan informasi mengenai arah pengembangan dan kebaruan penelitian mengenai tema tersebut. Sejumlah 679 literatur yang relevan berdasarkan data publikasi antara 2012 hingga 2022 dari koleksi Google Scholar telah dianalisis. Kata kunci yang digunakan dalam penelusuran adalah “biodiesel”, “rapeseed”, “corn”, “cottonseed”, “sunflower”, “soybean”, “sesame” and “coconut”. Harzing’s Publish or Perish dan VOSviewer digunakan sebagai perangkat untuk melakukan pengumpulan dan analisis terhadap publikasi dengan kata-kata kunci tersebut. Hasil penelitian menunjukkan bahwa dari 679 publikasi terkait biodiesel, diperoleh kata-kata dengan frekuensi kemunculan tertinggi yaitu “Masjuki”, “Sunflower Oil”, dan “USA” berturut-turut sebagai penulis, tema, dan negara yang paling banyak tertulis dalam artikel. Berdasarkan tahun publikasi terlihat bahwa pembahasan mengenai pengamatan sifat bahan bakar dan minyak nabati yang dapat dimakan menjadi isu yang relatif lebih baru. Di samping itu, jumlah paper yang membahas biodiesel cenderung semakin bertambah.
A A Comparison of Economics and Attractiveness of Fiscal System in Several Southeast Asian Countries : A Case Study of Three Oil And Gas Field in Indonesia Gabriela Martines Martines; Dwi Atty Mardiana; Pri Agung Rakhmanto
Journal of Earth Energy Science, Engineering, and Technology Vol. 6 No. 2 (2023): JEESET VOL. 6 NO. 2 2023
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jeeset.v6i2.17397

Abstract

The implementation of fiscal terms in the upstream oil and gas industry in a country is carried out with the hope of accelerating the decision-making process and making the attractiveness of upstream oil and gas investment more attractive to investors. This study evaluates fiscal terms in a country in a region used in Indonesia, Malaysia, Thailand, and Vietnam to determine the attractiveness of the fiscal terms. Using several indicators of government take (GT), front loading index (FLI), and composite score (CS), the fiscal attractiveness ranking of five fiscal schemes will be analyzed so that investors can consider which fiscal scheme is most attractive for their investment. The results of the economic analysis based on the economic indicators of IRR, NPV, POT, and PI show that the newly developed onshore, existing onshore, and offshore gas fields are included in the investment feasibility criteria with attractive economic values when applied with all fiscal schemes. While the ranking results with GT, FLI, and CS indicators show that Indonesia's gross split PSC has an attractive attractiveness when applied to newly developed onshore fields, R/C PSC on existing onshore fields, and Thailand’s concessions on offshore gas fields.
ANALYSIS ON LINKAGE AND MULTIPLIER EFFECTS OF UPSTREAM OIL AND GAS SECTOR IN INDONESIA'S ECONOMY USING INPUT-OUTPUT METHOD pri agung rakhmanto; Komaidi Notonegoro; Rini Setiati; Dwi Atty Mardiana
Scientific Contributions Oil and Gas Vol 48 No 1 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i1.1700

Abstract

The aim of this study is to analyze the role of the upstream oil and gas sector within Indonesia's economy in terms of its linkage to other sectors and the multiplier effect it produces. The input-output (IO) analysis method is applied by calculating the total, backward, and forward linkage index and multiplier effect index values of the upstream oil and gas sector. Building upon a previous study using the 2005 BPS IO Database updated in 2010 (2005 IO), this study used the 2010 IO Database released by BPS in 2015 (2010 IO) and the 2016 IO Database released in 2021 (2016 IO), processing the data using Python-based software. Based on the calculation using 2010 IO Database, there were 93 sectors with linkage to the upstream oil sector and 104 with linkage to the upstream gas sector, whereas the 2016 IO Database identified 96 sectors with linkage to the upstream oil sector and 113 with linkage to the upstream gas sector. Simulated calculation and analysis results revealed that there was an increase in total (backward and forward) linkage index values of the upstream oil and gas sector, from 3.8801 to 4.0826 for the upstream oil sector and from 3.1256 to 3.3940 for the upstream gas sector. In regard with multiplier effect, simulated calculation results also pointed towards an increase in total multiplier index values, from 6.1855 to 7.8943 for the upstream oil sector and from 4.9828 to 6.5630 for the upstream gas sector. The increase in total multiplier index in the national upstream oil and gas sector correlates with an increase in linkage between the upstream oil and gas sector and other sectors in Indonesia's economy as a whole, both backward and forward. Analysis results showed that the greater the multiplier index reported by a sector with linkage to the upstream oil and gas sector, the greater the total multiplier index produced in the upstream oil and gas sector.
The Effect of TiO2 Nanoparticles on The Performance of Kappaphycus Alvarezii Biopolymer for Enhanced Oil Recovery Muhammad Taufiq Fathaddin; Onnie Ridaliani Prapansya; Pri Agung Rakhmanto; Dwi Atty Mardiana; Wydhea Ayu Septianingrum; Sonny Irawan; Ridho Abdillah
Scientific Contributions Oil and Gas Vol 48 No 3 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i3.1909

Abstract

This study investigates the performance of a novel, environmentally friendly nanocomposite, utilizing the natural biopolymer Kappaphycus alvarezii enhanced with TiO2 nanoparticles, for Enhanced Oil Recovery (EOR) via polymer flooding. The application of this nanocomposite was aimed to simultaneously enhance microscopic displacement and macroscopic sweep efficiency. The research method used was laboratory testing which included solution stability, viscosity, interfacial tension (IFT), and rock wettability tests in various polymer concentrations (2,000–6,000 ppm), TiO₂ (2,000–4,000 ppm), and salinity (6,000–30,000 ppm) at temperatures of 30–80°C. Quantitative laboratory results confirm fluid property improvements: TiO2 addition increased the solution viscosity by up to 11 cP where an average increase up to 7.11% in high-salinity brines, reduced the Interfacial Tension (IFT) from 7.54 dyne/cm to 6.80 dyne/cm (a 9.8% reduction), and decreased the contact angle from 39.05° to 28.51°, confirming enhanced water-wetness. Core flooding experiments demonstrated that the polymer flooding yielded an incremental oil recovery factor after waterflooding ranging from 6.67% to 27.67%. The maximum total oil recovery achieved was 69.17% at the optimal concentration of Polymer 4,000 ppm and TiO2 2,000 ppm. These specific findings highlight the significant potential of the Kappaphycus alvarezii–TiO2 nanocomposite as an effective EOR agent.
Co-Authors Ageng Warasta Aqlyna Fattahanisa Asri Nugrahanti Dwi Atty Mardiana Esaim Mustafa Abrahim Omar Gabriela Martines Martines Komaidi Notonegoro Listiana Satiawati Mardiana, Dwi Atty Muhammad Taufiq Fathaddin, Muhammad Taufiq Onnie Ridaliani, Onnie Ratnayu Sitaresmi Ridho Abdillah Rini Setiati Rini Setiati Shabrina Sri Riswati Sonny Irawan Wydhea Ayu Septianingrum