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All Journal ARMATUR : Artikel Teknik Mesin dan Manufaktur Bhara Petro Energi
Devano Ramadhan
Institut Teknologi Sumatera
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Aktivasi Termal Abu Dasar Batubara terhadap Kinerja Adsorpsi dalam Peningkatan Sifat Fisik Pelumas Bekas Randy Kurniawan; Darrel Parulian Cleverson Aritonang; Dino Nata Hidayat; Raihan Ramadhan; Asri Damertine Girsang; Devano Ramadhan; Rezky Tri Yunanda; Glory Florensa Br Siregar; Rikki Martin Nababan; Ummi Kulsum Hidayati
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 2 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i2.11727

Abstract

Used lubricating oil contains degradation products and contaminants that may cause environmental pollution if improperly disposed of. This study investigated the utilization of coal bottom ash as an adsorbent for used lubricating oil purification and evaluated the effect of thermal activation on its adsorption performance. Bottom ash was purified using 2 M H₂SO₄ and subsequently thermally activated at 650°C for 3 h with NaOH assistance. The chemical composition of the adsorbent was analyzed using X-ray Fluorescence (XRF), while adsorption performance was evaluated through density, kinematic viscosity, and flash point measurements of the treated oil. XRF results showed that the purification process reduced Ca content from 22.36 wt.% to 10.44 wt.% and Fe content from 29.19 wt.% to 20.61 wt.% while preserving the major silica and alumina components. The thermally activated bottom ash exhibited better adsorption performance than the non-activated adsorbent, resulting in higher density and viscosity values of the treated oil. These findings demonstrate that thermal activation improves the adsorption capability of bottom ash, indicating its potential as a low-cost and environmentally friendly adsorbent for used lubricating oil purification.
Pore Pressure Estimation Using Sonic Log and Eaton Method:Well YCG-P2A Case Study Devano Ramadhan; Muhammad Rasyd Ridho; Muhammad Aqil Adib; Pasu Pradasari Purba; Gabe Bagus Arthantha; Cendikia Laisatara; Yolanda Tryana Sitorus
Jurnal Bhara Petro Energi Volume 5 No 1 (Mei 2026)
Publisher : Fakultas Teknik Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/3ypcw982

Abstract

Pore pressure prediction is an essential aspect of drilling planning to minimize the risks of kick, blowout, and lost circulation during drilling operations. This study focuses on estimating the pore pressure profile of Well YCG-P2A using sonic log data processed with the Eaton method. Sonic log responses from stable shale intervals were utilized to establish the Normal Compaction Trend (NCT), which served as the basis for pore pressure calculation within the depth range of 1,000–6,470 ft. Overburden stress was derived from density log integration, while hydrostatic pressure was calculated using a standard formation fluid gradient. The Eaton equation was then applied to generate a continuous pore pressure profile throughout the analyzed interval. The results show that pore pressure generally follows the hydrostatic trend, indicating predominantly normal pressure conditions across most of the well section. However, a localized decrease below hydrostatic pressure is observed at depths of approximately 3,500–3,700 ft, suggesting a possible underpressure anomaly. In contrast, pore pressure gradually increases above hydrostatic conditions within the 5,300–6,200 ft interval, indicating the presence of mild-to-moderate overpressure likely associated with undercompaction and restricted pore fluid expulsion. The Eaton method demonstrated good capability in identifying pressure variations and potential anomalous zones in Well YCG-P2A, although several intervals required careful interpretation due to log quality limitations and signal noise. Further calibration using direct formation pressure measurements, such as core analysis, Repeat Formation Tester (RFT), Modular Dynamics Tester (MDT), or Drill Stem Test (DST), is recommended to improve the reliability of the estimation results. Overall, this study provides a useful reference for mud weight determination, casing design, and drilling planning in Well YCG-P2A and adjacent wells within the same formation.
Co-Authors Asri Damertine Girsang Cendikia Laisatara Darrel Parulian Cleverson Aritonang Dino Nata Hidayat Gabe Bagus Arthantha Glory Florensa Br Siregar Muhammad Aqil Adib Muhammad Rasyd Ridho Pasu Pradasari Purba Raihan Ramadhan Randy Kurniawan Rezky Tri Yunanda Rikki Martin Nababan Ummi Kulsum Hidayati Yolanda Tryana Sitorus