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All Journal Physics Student Journal Jurnal Geocelebes JOURNAL OF EARTH ENERGY ENGINEERING SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) Jurnal Teknik Mesin Jurnal Peduli Masyarakat Petro : Jurnal Ilmiah Teknik Perminyakan Journal of Sustainable Energy Development Jurnal Geosaintek Jurnal Teknologi Sumberdaya Mineral Scientific Contributions Oil and Gas
Welayaturromadhona
Teknik Perminyakan, Fakultas Teknik, Universitas Jember
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Application of 2D Seismic Modeling in Gas Hydrate Reservoir Characterization Welayaturromadhona, Welayaturromadhona; Chen, How Wei
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.43451

Abstract

Gas hydrate reservoirs represent a significant unconventional energy resource with considerable potential for future energy supply and climate-related studies. However, their complex subsurface occurrence requires advanced geophysical methods for accurate detection and characterization. This study presents the application of two-dimensional (2D) seismic modeling to evaluate the seismic response of gas hydrate-bearing sediments and underlying free gas zones. The objective is to assess the reflection coefficients and amplitude variation with offset (AVO) to enhance the interpretation of subsurface features. The synthetic model is constructed using multichannel seismic data and velocity profiles derived from previous studies. Seismic wave propagation is simulated to observe the impedance contrasts across various subsurface layers. Results reveal that the Bottom Simulating Reflector (BSR), a key seismic indicator of gas hydrate presence, exhibits strong negative reflection amplitudes due to the presence of underlying free gas, which significantly reduces seismic velocity. Furthermore, AVO analysis shows that amplitude variations are highly sensitive to the acoustic impedance contrast at the hydrate-gas interface. These findings demonstrate the effectiveness of seismic modeling in improving gas hydrate reservoir characterization and provide a foundation for more accurate exploration strategies. The study contributes to both energy development and environmental monitoring efforts involving gas hydrates.
Penentuan Nilai Porositas pada Sample Berea di Routine Core Analysis Laboratorium BBPMGB “LEMIGAS” Febriyana, Marine Chyntya; Welayaturromadhona
Journal of Sustainable Energy Development Vol. 2 No. 1 (2024): Journal of Sustainable Energy Development (JSED)
Publisher : Petroleum Engineering, Faculty of Engineering, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jsed.v2i1.756

Abstract

This study aims to analyze routine cores, especially for determining the porosity of a rock.  The samples tested by the coreval tool were 3 samples of 1.5 inch diameter with a length of 4.5 cm each. The sample used is a sample of Berea sandstone.  When the core sample comes, it is continued with ct-scan and spectral gamma ray. The next process is washing the fluid in the core sample. After cleaning from other fluids, the core sample will be dried in the oven. After it is completely dry, the sample must be stored in a desiccator containing silica gel. After ambient temperature, then the core sample is tested using Coreval 700.  The data inputted into the coreval computer are the name of the core sample, the dry weight of the core, the length of the core, and the diameter of the core. The coreval tool takes readings of bulk volume, pore volume, and porosity. This reading resulted in bulk volume values of 50.091 cc; 53.446 cc; and 52.410 cc, respectively. The pore volume value of each sample is 12.091 cc; 13.787 cc; and 13.385 cc. As for porosity, the value of each sample is 25.767%; 25.795%; and 25.540%. Keywords: coreval 700; permeability; porosity, RCAL
EVALUASI KINERJA HEAT EXCHANGER 260E-103 PADA KILANG LUBE OIL COMPLEX III UNIT 260 PT KILANG PERTAMINA INTERNASIONAL RU IV CILACAP Villia Rian Ashari; welayaturromadhona, welayaturromadhona
Journal of Sustainable Energy Development Vol. 2 No. 2 (2024): Journal of Sustainable Energy Development (JSED)
Publisher : Petroleum Engineering, Faculty of Engineering, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jsed.v2i2.1364

Abstract

In the process of processing petroleum, PT Pertamina International RU IV Cilacap is equipped with a heat exchanger asa supporting tool for the production and processing. Heat exchanger functions as a heat exchange that works with theprinciple of heat exchange without mass transfer. The use of heat exchangers that are in extreme environments and areused for a long period of time to pass fluids, there is a high probability of deposit formation or impurities that can affectthe pressure drop and decrease the performance efficiency of the heat exchanger in terms of heat exchange. Planning forcleaning must be considered to maintain the performance of the heat exchanger performance so that it remains in optimalcondition. The heat exchanger that will be evaluated in this study is Heat Exchanger 260E-103 at PT PertaminaInternational RU IV Cilacap. The research was conducted using quantitative methods through the calculation of foulingfactor, pressure drop, and heat transfer efficiency. The results showed that the Rd value of Heat Exchanger 260E-103 ofLMO was 0.0317 hr ft2 oF/Btu; 0.0058 hr ft2 oF/Btu; 0.0048 hr ft2 oF/Btu, MMO was 0.0193 hr ft2 oF/Btu; 0.0157 hr ft2oF/Btu; 0.0070 hr ft2 oF/Btu, and DAO of 0.0153 hr ft2 oF/Btu; 0.0193 hr ft2 oF/Btu; 0.0029 hr ft2 oF/Btu. The pressuredrop value of Heat Exchanger 260E-103 of LMO is 12.021 Psi; 10.632 Psi; 10.416 Psi, MMO is 11.077 Psi; 11.108 Psi;10.435 Psi, and DAO is 14.149 Psi; 13.764 Psi; 13.625 Psi. The efficiency for Heat Exchanger 260E-103 of LMO is22.81%; 79.47%; 82.16%, MMO is 29.07%; 46.03%; 72.16%, and DAO is 17.43%; 60.06%; 45.04%. The results showthat Heat Exchanger 260E-103 is not suitable for use because it has Rd and pressure drop values exceeding normallimits, and efficiency is below standard.
Estimasi Cadangan Lapangan RTD Menggunakan Metode Decline Curve Analysis Dan Log WC Vs Np Maulana, Nadhif; Abror, Hadziqul; welayaturromadhona
Journal of Sustainable Energy Development Vol. 3 No. 1 (2025): Journal of Sustainable Energy Development (JSED)
Publisher : Petroleum Engineering, Faculty of Engineering, University of Jember

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Abstract

Lapangan RTD dibor pada tahun 1984 dengan sumur RTD-1 dan terus berproduksi sejak saat itu. Hingga tahun 2020, total sumur yang dibor di lapangan sebanyak 20 sumur, 13 diantaranya masih berproduksi dan 6 sumur digunakan untuk injeksi air. Lapangan RTD terdiri dari 3 reservoir yaitu Holland Greensand, De Lier Sandstone, dan Ijsselmonde Sandstone. Ketiga reservoir Rotterdam menghasilkan minyak, air dan sejumlah kecil gas. Reservoir Batupasir IJsselmonde telah berproduksi sejak tahun 1984, Reservoir Batupasir De Lier telah berproduksi sejak tahun 1986 dan Reservoir Holland Greensand telah berproduksi sejak tahun 1988. Penelitian ini membahas tentang evaluasi cadangan pada lapangan RTD dengan melakukan perhitungan cadangan. Metode yang digunakan adalah metode Decline Curve Analysis dan metode Log WC vs Np. Perhitungan akan dikelompokkan menjadi 2 yaitu seluruh lapangan RTD dengan menggunakan kedua metode dan yang kedua yaitu menggunakan metode Log WC vs Np pada masing-masing lapisan. Metode penelitian yang digunakan adalah study literatur yang berhubungan dengan perhitungan cadangan pada lapangan RTD yaitu dengan mengumpulkan informasi data sekunder mengenai data – data untuk forecasting dalam bentuk buku – buku literatur, jurnal, dan tugas akhir yang berkaitan dengan judul peneliti. Lapangan RTD memiliki total STOOIP 319 MMSTB dari 3 reservoir dan masing-masing reservoir memiliki watercut 56% - 82%. Perhitungan cadangan Lapangan RTD mendapatkan hasil RR 8,71 MMSTB dengan EUR 67,52 MMSTB, dan memperoleh hasil RR 8,25 MMSTB dengan EUR 67,05 MMSTB. Hasil masing-masing lapisan di lapangan RTD bila ditotal mendapatkan hasil RR 6,62 MMSTB dengan EUR 65,43 MMSTB.
Desain Hydraulic Fracturing Sebagai upaya Peningkatan Produktivitas Sumur X Lapangan Y Berliana Dewi, Salsabila; Abror, Hadziqul; welayaturromadhona, welayaturromadhona
Journal of Sustainable Energy Development Vol. 3 No. 1 (2025): Journal of Sustainable Energy Development (JSED)
Publisher : Petroleum Engineering, Faculty of Engineering, University of Jember

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Abstract

The decline in oil production due to aging wells and formation damage has become a critical challenge in the petroleum industry. This study focuses on the design of hydraulic fracturing to improve Well X's productivity in the Telisa Formation, Central Sumatra Basin. The research utilized FracCADE 7.0 software to simulate hydraulic fracturing scenarios and optimize fracture geometry and conductivity. The parameters investigated included variations in fracturing fluid volume, proppant types, and injection methods, culminating in 12 simulation scenarios. The geomechanical analysis revealed that the Telisa Formation, dominated by low Young’s modulus (<3×10⁶ psi) and low Poisson’s ratio, is favorable for fracturing, as it tends to generate wider fractures at lower pumping pressures. However, higher Young's modulus layers at greater depths showed the potential for longer but narrower fractures, albeit requiring higher pumping pressures. These characteristics guided the selection of fracturing intervals and operational parameters to optimize stimulation results. The results showed that the optimal scenario utilized 32,239 gallons of fracturing fluid, Brady Sand as the proppant, and the Proppant Concentration Step-Wise Increasing (PCSI) injection method. This configuration produced fractures with a half-length of 171 ft, width of 0.149 inches, height of 253.3 ft, and fracture conductivity of 13,592 mD.ft, resulting in a Fold of Increase (FOI) of 6.82. Economically, this scenario required a total cost of $574,576.47 and achieved a pay-out time (POT) of 48 days, with a net present value (NPV) of $3,534,073.21 after one year. This research highlights the technical and economic advantages of hydraulic fracturing in maximizing well productivity. It provides a detailed recommendation for future stimulation activities in Well X, emphasizing the balance between production enhancement and cost efficiency.
MINERALOGY AND MICROSTRUCTURE OF RANTAU DEDAP'S GEOTHERMAL RESERVOIR: HYDROTHERMAL ALTERATION INSIGHTS Welayaturromadhona Welayaturromadhona; Firman Sauqi Nur Sabila; Mauliate Agustinus Hamonangan Sihotang; Luthfi Rindra Salam; Fifi Izzati
Jurnal Geosaintek Vol. 11 No. 3 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i3.8982

Abstract

The Great Sumatra Fault controls the Rantau Dedap geothermal system in South Sumatra. It is a high-temperature volcano-tectonic system. This study presents a comprehensive mineralogical and microstructural examination of core samples from three deep wells (UJ-A1, UJ-B1, and UJ-C1) at depths ranging from 1,840 to 2,313 m, aiming to elucidate hydrothermal alteration and its impact on reservoir quality. X-ray Diffraction (XRD) and Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS) analyses demonstrate a distinct propylitic alteration zonation correlated with increasing depth and temperature. UJ-A1 (1840 m) is mainly made up of oligoclase, microcline, and quartz. UJ-B1 (2142 m) is mainly made up of oligoclase-quartz. UJ-C1 (2313 m) is mainly made up of anorthite-quartz with more iron. Anorthite, a calcium-rich plagioclase that stays stable above 280 °C, is found at greater depths. This means that the area is close to a major upflow zone. SEM microstructural analysis reveals hydrothermal breccia textures, characterized by angular fragments within a matrix of secondary minerals, and indicates secondary porosity resulting from mineral alteration. These characteristics suggest that hydraulic brecciation resulting from tectonic activity is essential for the creation and preservation of reservoir permeability. The reservoir's potential is enhanced because it lacks smectite-type clays, which typically block pores. In general, these results indicate that Rantau Dedap is a structurally controlled upflow zone characterized by deep mafic lithologies. The anorthite-quartz assemblage stands out as a key sign for future high-temperature geothermal exploration.
Performance of Lignoslfonate Derived from Coffee Husk as A Natural Emulsifier in Enhanced Oil Recovery: A Phase Behaviour Study Rindra Salam, Luthfi Rindra Salam; Riska Laksmita Sari; Welayaturromadhona
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.v48i3.1822

Abstract

The oil industry faces challenges in enhancing oil recovery while reducing environmental impact. This study explores the utilization of lignin extracted from coffee husk, an agricultural waste, as a natural emulsifier in enhanced oil recovery (EOR). The research addresses key issues including identifying lignin's functional groups via fourier transform infrared (FTIR) spectroscopy before and after sulfonation, determining compatible lignosulfonate concentrations through aqueous stability tests, and optimizing salinity for effective emulsification. Lignin was extracted via soda pulping and modified through sulfonation with sodium bisulfite (NaHSO₃) to produce lignosulfonate. FTIR analysis confirmed successful sulfonation, evidenced by new peaks at 636 cm⁻¹ (S–O) and 1101 cm⁻¹ (SO₃⁻). Aqueous stability tests at 60°C showed that a 0.8% (w/v) lignosulfonate concentration remained stable in brine with 20,000 ppm salinity. Salinity scans identified optimal conditions at 25,000 ppm, where the system achieved a balanced solubilization ratio of 0.95, indicating low interfacial tension. These results demonstrate that sulfonated coffee husk lignin has significant potential as a sustainable emulsifier for EOR applications, with a concentration of 0.8% and a salinity of 25,000 ppm being optimal for emulsion stability. This study supports circular economy principles by valorizing agricultural waste and offers a promising alternative to synthetic chemicals in the oil industry.
Peningkatan implementasi Keselamatan dan Kesehatan Kerja (K3) Destana Rambipuji dalam operasi penanggulangan bencana Hadziqul Abror; Eriska Eklezia Dwi Saputri; Riska Laksmita Sari; Welayaturromadhona Welayaturromadhona; Agus Triono
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 8, No 2 (2024): June
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v8i2.23443

Abstract

AbstrakDesa Rambipuji memiliki topografi daratan dengan ketinggian berkisar 145 mdpl dan dilalui oleh sungai Dinoyo yang mengalir dari hulu lereng pengunungan Argopuro. Kondisi sungai terus mengalami pendangkalan, puncaknya pasca banjir bandang 2006 dan sampai saat ini belum ada normalisasi sungai Dinoyo. Desa Rambipuji sangat rawan banjir karena permukaan air sungai Dinoyo relatif sejajar dengan perkampungan padat penduduk sehingga hampir tiap tahunnya mengalami bencana banjir. Untuk menanggulangi bencana banjir yang tiap tahun terjadi, Desa Rambipuji membentuk Desa Tanggap Bencana (Destana) Rambipuji. Destana ini secara cepat dan tanggap melakukan kerja penanggulangan bencana pada pra bencana, darurat bencana serta pasca bencana. Dalam menjalankan fungsinya, Destana terdiri dari unsur pengurus dan relawan. Destana ini sudah dibekali dengan kemampuan teknis kebencanaan, namun saat operasi penanggulangan bencana relawan seringkali bekerja dengan membahayakan diri sendiri seperti tanpa APD yang memadai dan mengabaikan potensi bahaya dari kegiatannya. Untuk itu, penting dilakukan adopsin konsep K3 dari dunia industri untuk diimplementasikan Destana Rambipuji sebagai upaya meminimalisir resiko dan meningkatkan kepatuhan relawan pada prosedur kerja yang memenuhi aspek K3. Adapun kegiatan pengabdian ini meliputi tahap persiapan program pada bulan Juni-Juli 2023; Sosialisasi K3 dalam operasi tangguh bencana dan bimbingan teknis penyusunan job safety analysis (JSA) operasi bencana yang dilaksanakan pada tanggal 29 Juli 2023; serta pendampingan penyusunan SOP kerja berbasis K3 yang dilaksanakan pada bulan Agustus-November 2023. Dari kegiatan ini, relawan Destana Rambipuji memiliki kesadaran terkait pentingnya budaya K3, mampu melakukan managemen resiko saat operasi tanggap bencana, mampu menyusun dokumen JSA, serta melengkapi SOP kerja berbasis K3. Kata kunci: K3; destana; tangguh bencana; banjir AbstractRambipuji Village has a land topography with an altitude of around 145 metres above sea level and is traversed by the Dinoyo river which flows from the upstream slopes of the Argopuro mountains. The condition of the river continues to silt up, culminating in the 2006 flash flood and until now there has been no normalisation of the Dinoyo river. Rambipuji village is prone to flooding because the Dinoyo river's water level is relatively level with the densely populated villages, so flooding occurs almost every year. To cope with the floods that occur every year, Rambipuji Village formed the Rambipuji Disaster Response Village (Destana). This Destana quickly and responsively carries out emergency work in pre-disaster, disaster emergency and post-disaster. In carrying out its functions, Destana consists of administrators and volunteers. Destana has been equipped with disaster technical skills, but during disaster management operations volunteers often work by endangering themselves such as without adequate PPE and ignoring the potential dangers of their work. For this reason, it is important to adopt the Occupational Health and Safety (OHS) concept from the industrial world to be implemented by Destana Rambipuji as an effort to minimise risk and increase volunteer compliance with work procedures that meet OHS aspects. The service activities include the program preparation stage in June-July 2023; OHS socialisation in disaster resilient operations and technical guidance on the preparation of job safety analysis (JSA) for disaster operations carried out on 29 July 2023; and assistance in preparing OHS-based work SOPs carried out in August-November 2023. From this activity, Destana Rambipuji volunteers have an awareness of the importance of OHS culture, are able to carry out risk management during disaster response operations, are able to compile JSA documents, and complete OHS-based work SOPs. Keywords: HSE; disaster response village; disaster resilience; flood
ML Modeling for Carbonate Reservoir Characterization Mahfudhoh, Sayyidah Adilia; Welayaturromadhona
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.v49i1.1969

Abstract

Reservoir characterization is essential for understanding rock and fluid behavior in hydrocarbon field development. In the Baturaja Formation, South Sumatra Basin, this process is challenging due to heterogeneity resulting from depositional and diagenetic variations. Limited core data and the high cost of conventional analysis encourage the use of machine learning (ML). This study aims to predict formation, facies, porosity, and permeability using ML algorithms and to assess the impact of feature augmentation. The dataset includes well log and core data from 13 wells. The workflow consists of preprocessing, feature selection, feature engineering, and supervised learning using Decision Tree, Random Forest, XGBoost, and KNN. Performance was evaluated using the F1-score for classification and MAE/RMSE for regression, followed by blind testing on wells HARLEY and XSR. Random Forest achieved the best formation prediction (F1-score 0.9890; blind test 0.9975) because the well data fall within the range of the training data distribution, although accuracy decreased in XSR due to differences in data distribution. XGBoost was the most accurate for facies prediction, improving from an F1-score of 0.9648 to 0.9741 after feature augmentation. For porosity and permeability, Random Forest produced the lowest errors, although permeability remained challenging in heterogeneous carbonates. Overall, ML provides an efficient and accurate approach, with Random Forest and XGBoost performing best, and feature augmentation consistently enhancing model generalization.
Co-Authors Adi Susilo Agus Triono Berliana Dewi, Salsabila Chen, How Wei Edward Hamid Muhammad Eriska Eklezia Dwi Saputri Eriska Saputri Febriyana, Marine Chyntya Fifi Izzati Firman Sabila Firman Sauqi Nur Sabila Hadziqul Abror Haeruddin Haeruddin Hermawan, Bagus Danial Hetty Triastuty Irvan Saputra Luthfi Rindra Salam Mahfudhoh, Sayyidah Adilia Maulana, Nadhif Mauliate Agustinus Hamonangan Sihotang Nugraha, Farhan Rahma Rei Sakura Rindra Salam, Luthfi Rindra Salam Riska Laksmita Sari Sabila, Firman Sauqi Nur Saputra, Irvan Sartika Purwandari Tri Vicca Kusumadewi Villia Rian Ashari