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All Journal Journal of Petroleum and Geothermal Technology Journal of Earth Energy Science, Engineering, and Technology
Saputra, Ega Dimas
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Earth & Planetary Sciences Energy Engineering

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Synthesis of Synthetic Brine to Estimate Carbonate Scale Index in Oil Industry Nugraha, Fanata Yudha; Asmorowati, Dewi; Saputra, Ega Dimas; Astuti, Dian Indri; Tony, Brian; Waisnawa, I Putu Gema Bujangga
Journal of Petroleum and Geothermal Technology Vol. 5 No. 2 (2024): November
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jpgt.v5i2.13636

Abstract

The decreased oil production due to scaling in production equipment results in costs. In oil wells, ions such as calcium, barium, carbonate, sulfate, magnesium, sodium, and chloride are commonly present in formation water. Excessive solubility of ions can trigger precipitation or what is often called scale. This study focuses on creating synthetic brine with a composition resembling field formation water as an alternative solution for rapid laboratory-scale measurement of the scale index. In this study focus on carbonate and bicarbonate scale. The stages of the research involves synthetic brine preparation, physical and chemical testing of the brine, comparison with formation water, and calculation of the Stability Index (SI) using Stiff & Davis method. The results indicate that synthetic brine can be prepared based on laboratory analysis of field samples by estimating the materials and masses present in formation water, thus allowing replication using natural or chemical materials in the laboratory while considering parameters such as pressure, temperature, and pH during the manufacturing process. The pH significantly impacts the risk of scale formation, where a slightly basic pH, around pH 8, supports higher concentrations of carbonate ions (CO32-) and bicarbonate ions (HCO3-), thereby increasing the risk of scale formation.
The Analysis of Polyamine Mud Application in Drilling Claystone and Shale in ES Field Tony, Brian; Saputra, Ega Dimas; Astuti, Dian Indri
Journal of Earth Energy Science, Engineering, and Technology Vol. 8 No. 2 (2025): JEESET VOL. 8 NO. 2 2025
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/w83pta14

Abstract

Historically, the ES Field is a drilling area located in South Sumatera Basin that applies 10% KCl Polymer throughout the drilling section. Challenges such as pipe sticking and increased borehole diameter due to washout have been encountered in this field. Increased cement volume and tripping time are factors affecting drilling efficiency. Therefore, innovation and improvement in the type of drilling mud used are needed to address these challenges in the field. This paper discusses the effectiveness of polyamine through shale study analysis, including CEC, dispersion, accretion, XRD, and LSM, as well as performance analysis of mud application as an alternative to KCl-Polymer in the drilling of Well ED-24 in the ES Field. Results indicate that polyamine has advantages and benefits as an inhibitor. Shale study from the cuttings of Well ED-22 shows that shale in the Gumai Formation is characterized by kaolinite and is dispersive, hence the use of polyamine. In the 17.5-inch trajectory, tight hole issues were found due to swelling clay at a depth of 561 mMD, which had not occurred previously with 10% KCl-Polymer mud. In the 12.25-inch trajectory, the main cause of shale collapse was insufficient mud weight. Overall, polyamine mud effectively suppresses solid dispersion into the mud, prevents balling, and addresses hole cleaning issues during drilling. The use of 10% KCl-Polymer can be reconsidered for subsequent drilling in the Air Benakat claystone formation, while polyamine mud remains relevant and should be considered for drilling the dispersive Gumai shale formation to suppress solid dispersion.
Co-Authors Astuti, Dian Indri Dewi Asmorowati Nugraha, Fanata Yudha Tony, Brian Waisnawa, I Putu Gema Bujangga