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Scientific Contributions Oil and Gas
Published by LEMIGAS
ISSN : 20893361     EISSN : 25410520     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy
The Scientific Contributions for Oil and Gas is the official journal of the Testing Center for Oil and Gas LEMIGAS for the dissemination of information on research activities, technology engineering development and laboratory testing in the oil and gas field. Manuscripts in English are accepted from all in any institutions, college and industry oil and gas throughout the country and overseas.
Arjuna Subject : Energi (semua kategori) - Teknologi Bahan Bakar
Articles 619 Documents
 58   59   60   61   62 
One Phase Well Design for Minimum Drilling Cost at ZAZ Field Kharisma Idea; Yaumil Hasbiyallah; Kesuma Ardhana Oerika; Muhammad Yusrin
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.v48i3.1888

Abstract

Drilling cost components including rig, casing and accessories, well surface equipment, drilling mud, bits, cementing, and casing installation substantially influence the overall drilling cost. The One Phase Well (OPW) design is implemented by eliminating the surface casing, which is conventionally applied in casing designs for wells in the ZAZ Field. This study evaluates drilling parameters such as well data, well trajectory, pore pressure–fracture gradient, drilling time, material usage, and drilling costs. A well profile analysis is conducted to compare the Three Phase Well (TPW) and One Phase Well (OPW) designs. Analysis of drilling time, materials, and drilling costs is carried out to evaluate the cost reduction difference between the Three Phase Well (TPW) method and the One Phase Well (OPW) method.The OPW design reduces rig rental costs by 34.9%, bit costs by 53.9%, casing costs by 20.5%, wellhead costs by 8.7%, and mud costs by 3.7%. In contrast, cementing costs increase by 0.7%, and casing installation incurs an additional cost of USD 24,017. Overall, the total drilling cost difference between OPW and TPW amounts to USD 68,633, with OPW achieving a 12.7% reduction in overall drilling costs compared to TPW.
Application of Anthracite and Activated Carbon Filter Media to Enhance Injection Water Quality for Water Flooding Operations in “DE” Field Dahrul Effendi; Rian Cahya Rohmana; Priskila Rully Setiyaningrum; Aliyah Muhamad Bisyir
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.v48i4.1895

Abstract

Produced water is used as injection water for water flooding. When untreated injection water of poor quality is introduced into the formation, it can lead to severe plugging issues. This is primarily due to the poor quality of the water, which is characterized by high levels of solid particles, elevated turbidity, a high scaling index, significant oil content, high TSS concentration, and a high RPI. The application of anthracite and activated carbon filter media has been shown to effectively reduced the scaling index, oil content, turbidity, particle size, TSS, and RPI in the injection water. These filter media enable the filtering out of insoluble materials from the injection water. By evaluating the effectiveness of different filter media on injection water quality, it is possible to select a filtrate with improved water quality, characterized by a clear appearance and minimal amounts of solid particles. The resulting filtrate demonstrated very low TSS concentrations and a significantly reduced RPI value. Overall, the filtrate can be classified as high-quality injection water suitable for water-flooding applications. The morphology of TSS before and after filtration through anthracite and activated carbon filter media was detected using SEM.
Drilling Fluid Optimization Using Response Surface Methodology Bayu Satiyawira; Mustamina Maulani; Lisa Samura; Havidh Pramadika; Asri Nugrahanti; Cahaya Rosyidan; Andry Prima; Muhammad Dzaki Arkaan; Widia Yanti
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.v48i4.1900

Abstract

Water-based drilling fluids commonly exhibit rheological degradation under high-temperature, high-pressure (HTHP) conditions, resulting in significant reductions in viscosity, yield point (YP), and gel strength (GS). Previous studies relying on conventional additives such as PAC, CMC, KOH, and NaOH have not fully resolved this issue, particularly in maintaining rheological stability at elevated temperatures. This study addresses this gap by introducing an alkaline polymer as a multifunctional additive intended to replace several conventional components while enhancing thermal resistance. Response Surface Methodology (RSM) with a Box–Behnken design was used to evaluate the combined effects of Carboxymethyl Cellulose (CMC) and alkaline polymer at three temperature levels: 80°F, 150°F, and 250°F. Experimental results show that at 150°F, the optimized formulation consists of 3.5 g CMC and 3.6 g alkaline polymer, yielding a viscosity of 17.64 cP, plastic viscosity of 12.46 cP, and a YP of 7.72 lb/100 ft², representing a substantial improvement compared to the baseline formulations, where YP values decreased significantly with temperature. The optimized mud also demonstrated improved gel strength and consistent filtrate control relative to non-optimized systems. The novelty of this study lies in the use of an alkaline polymer as a single multifunctional substitute for multiple drilling-fluid additives, combined with a multi-temperature RSM optimization framework. The findings provide a simplified, thermally stable drilling-fluid formulation suitable for HTHP environments.
Rheological Interactions Between Divalent Barium and Sulfate Ions in Hydroxypropyl Guar Polymer Fracturing Fluids Dewi Asmorowati; Miftah Hidayat; Dedi Kristanto; Ardhi Hakim Lumban Gaol; Tutuka Ariadji; Taufan Marhaendrajana
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.v48i4.1904

Abstract

The use of produced water as a primary component in formulating polymer-based fracturing fluids is becoming a viable option due to the limited availability of fresh water in the field. Nevertheless, the practical use of production water faces several challenges due to its complex composition, which includes monovalent and divalent ions that considerably affect the fluid’s viscosity. Recent studies have shown that calcium ions substantially influence the viscosity of linear fracturing fluids, whereas magnesium ions, do not have a notable effect. However, the effects of other divalent ions commonly found in production water, such as barium and sulfate, remain underreported. In this study, the influence of barium and sulfate ions on linear fracturing fluids will be examined. The viscosity of linear gel fracturing fluids, prepared using hydroxypropyl guar (HPG) polymer with varying concentrations of barium and sulfate ions, will be investigated under different shear rates and temperatures. The results indicate that produced water contains barium and sulfate ions, which affect the rheology of the linear fracturing fluid. A concentration of 150 ppm of BaCl2 can increase the viscosity by 30%, whereas 150 ppm of Na2SO4  increases the HPG viscosity by 7% at ambient temperature (25 °C). At 70 °C, the effect of barium and sulfate ions on the increase in viscosity of the HPG linear fracturing fluid are observed to be less significant.
Coiled Tubing Circular Efficiency: A Systematic Literature Review on Failure Mechanisms, Inspection Methods, and Reuse Potential Warno; Suharjito
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.v48i4.1906

Abstract

Coiled tubing (CT) has become a critical technology in oil and gas operations, yet its service life is constrained by fatigue, corrosion, and erosion. In marginal fields, the high capital cost of new CT strings for permanent installations such as gas lift creates significant economic challenges. Reusing existing CT assets presents a cost-efficient and sustainable alternative. This study conducts a systematic literature review of 33 Scopus-indexed journal and conference publications to examine CT failure mechanisms, integrity inspection methods, and the economic potential of reuse in marginal fields. The reviewed data were classified by failure mode, inspection technique, application, and economic perspective. The findings reveal that low-cycle fatigue is the most extensively studied failure mode, with wall thickness reduction identified as a key indicator of structural degradation. Current integrity assessments rely heavily on predictive modelling and non-destructive evaluation (NDE) methods, particularly magnetic flux leakage (MFL) and eddy current testing (ECT). Nevertheless, the absence of reliable, field-practical wall thickness measurement remains a critical gap, for which ultrasonic testing (UT) emerges as a promising solution. Case studies further demonstrate the technical feasibility and cost-effectiveness of CT reuse. This review underscores the importance of transitioning from a linear “use-and-scrap” paradigm toward a circular “use-inspect-reuse” framework, with UT serving as a pivotal enabler. This approach enhances economic viability and advances alignment with the United Nations Sustainable Development Goals.
Improvement of Operating Performance of Medium-Speed Marine Diesel Engines Using Marine Diesel Oil with Air Microbubbles Hideo Kawahara; Tomohiro Sunada; Yasuhito Nakatake; Koichi Terasaka; Hiroshi Kawahara; Hidechika Goto
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.v48i4.1908

Abstract

Marine diesel engines are widely adopted as the main auxiliary engines in ships because of their ability to utilize inexpensive heavy fuel oil and their high thermal efficiency per unit engine. This study focuses on practical marine medium-speed diesel engines to investigate the impact of introducing air as fine bubbles into low-sulfur A heavy fuel oil on the operating performance. The results indicated that when fine bubbles were introduced into the fuel, the engine exhibited poor combustion and became unstable at any load when Qa was 0.4 L/min or higher. However, when Qa was below 0.4 L/min, the fuel efficiency improvement increased significantly with increasing load, reaching a maximum reduction of 4.5% at 75% load and Qa = 0.3 L/min. Regarding the exhaust gas characteristics, at low loads, no significant changes were observed in the CO2 and NOx emissions with varying microbubble injection levels. However, at loads of 75% or higher, both the CO2 and NOx emissions decreased as the microbubble injection level increased. Furthermore, introducing fine bubbles into the fuel promoted atomization after fuel injection, similar to the results for heated C heavy oil, leading to improved heat generation rates across the entire engine load range.
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.
Influence of Installation Orientation and Cone Angle on Pressure Drop and Filtration Efficiency of Conical Strainers Amnur Akhyan; Mhd Dhowiy Hussein; Mohd Azahari Bin Razali
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.v48i3.1910

Abstract

Cone strainers are very important in oil and gas pipeline systems because they prevent particles from entering the system and damaging pumps, compressors, and other critical equipment. This study experimentally examines the effects of cone angle, installation orientation, and open area ratio (OAR) on pressure drop (ΔP) and filtration efficiency (η) in conical filters. Four setups were examined with cone angles of 74° and 81° and hole diameters of 4 mm and 6 mm, at flow rates between 15 to 30 m³/hour. The results reveal that the 81° configuration (OAR = 38%) with unidirectional installation has the lowest pressure drop (1,250–2,500 Pa) and a filtration efficiency of over 92%, making it ideal for energy-efficient use. Conversely, the 74° cone can capture more particles (>93%) but experiences higher pressure loss (up to 9,500 Pa), making it suitable for applications requiring very stringent filtering. Installing the counter-current way was shown to increase turbulence and lower efficiency by up to 20%, which demonstrates the importance of the correct installation orientation for maintaining hydrodynamic stability and filtering effectiveness. These results highlight the critical need to optimise cone geometry and OAR to strike a balance between energy efficiency, hydraulic stability, and filtering performance. For pre-filtration and equipment protection in oil and gas systems, the optimal setup is an 81° angle, a 6 mm hole, a 38% OAR, and unidirectional flow. This configuration can contribute to smoother operations, energy savings, and reduced maintenance requirements.
Application of Ultra Fine Bubble Addition to Diesel Fuel on The Performance of Agricultural Transport Vehicle Engines Ahmad Ardiansyah; Sam Herodian; Faqih Supriyadi; Riva Yudha Abriyant; Cahyo Setyo Wibowo
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.v48i4.1921

Abstract

Diesel engines have long been the primary choice across various industrial sectors, including agricultural transport vehicles. However, energy efficiency and fuel consumption remain significant challenges. One approach to address these issues is the application of Ultra Fine Bubble (UFB) technology to diesel fuel, which aims to enhance physical fuel properties and improve combustion efficiency. This study was conducted to evaluate the effect of UFB treatment on B0 CN-51 and B40 fuels in relation to fuel quality and diesel engine performance. The fuel characterization tests showed that the calorific value of B0 CN-51 increased from 43.73 MJ/kg to 45.68 MJ/kg, and B40 from 42.46 MJ/kg to 42.94 MJ/kg. The cetane number also increased, accompanied by a reduction in sulfur content and lubricity. Performance testing using a chassis dynamometer indicated improvements in maximum power and torque. B0 CN-51 UFB produced 95.68 kW of power and 344.18 Nm of torque, while reducing specific fuel consumption (SFC) from 42.25 to 39.82 g/kWh. In addition, fuel consumption in ℓ/100 km decreased significantly, with an average reduction in efficiency of up to 4.85%. For B40, SFC decreased from 44.99 to 43.75 g/kWh, with an average consumption reduction of 1.73%. These results demonstrated that UFB can significantly improve diesel engine performance and fuel efficiency.
Utilizing Used Lubricants to Enhance Intermediate Crude Oil Recovery Through Water-in-Oil Emulsions Mukhlis Noor Alfatih; Dwi Atty Mardiana; Shabrina Sri Riswati; Changhyup Park
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.v48i4.1924

Abstract

This study experimentally analyzes the impacts of water-in-oil (W/O) emulsion derived from used lubricants on enhanced intermediate-crude-oil recovery. The objective is to identify a viable and economically efficient method to enhance the extraction of intermediate crude oil. Typically, W/O emulsions have been employed as displacing fluids in heavy oil reservoirs. According to the results, there have been challenges experienced in the selection of an affordable petroleum-based product and ensuring its availability for emulsion preparation. Used lubricants can be incorporated as a component in the formulation of an emulsion solution by mixing them with brine. The physical and chemical properties of these used lubricants are evaluated to determine their suitability as a displacing agent. Subsequently, several concentrations of the emulsion were prepared, ranging from 5% to 60% (vol/vol), to effectively evaluate their suitability as a displacing fluid. The experimental workflow covered viscosity testing, mobility ratio measurement, IFT evaluation, emulsion stability checks, adsorption analysis, and thermal stability assessment. Core-flooding is performed to determine the recovery factor. A 5% W/O emulsion is found to be an effective displacing fluid for intermediate crude oil. The core-flooding results showes about a 27% increase in recovery when using the conventional flooding emulsion. Overall, the findings indicate that adding used lubricants to W/O emulsions improves intermediate oil recovery due to their favorable viscosity and stability.

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