Meyliana Wulandari, La Viola Michelle Sampaleng, Marhamatus Syifa Shalihah, Supardi Razak, Muhammad Ihsan Sofyan, Sun Theo Constan Lotebulo Ndruru, Rachmi Kartini, Nofrizal Nofrizal, Suwardiyanto, Pandian Bothi Raja
Swelling is a common problem in the oil and gas drilling industry. Swelling causes instability and collapse of the drilling hole; therefore, using shale inhibitors is crucial. This study aims to determine the performance of hydrolyzed chitosan as a shale inhibitor on formations that contain montmorillonite (Mt) as the major composition. The molecular weight of hydrolyzed chitosan using 5 % acetic acid for 90 min at 60°C is 6422.43 kDa. Hydrolysis characterization was investigated using Fourier transform infrared spectroscopy. To determine the performance of chitosan as a shale inhibitor, hydrolyzed chitosan was added to a water-based mud (WBM) system according to reservoir temperature conditions (250 °F, HPHT). WBM that has been aged for 16 h is then used for the swelling meter measurement. Then, WBM with variations of shale inhibitor KCl, polyamine, and hydrolyzed chitosan is contacted with a reservoir formation containing Mt, and its swelling rate is measured. A swelling rate and a comparative study were conducted using commercial shale inhibitors (KCl and polyamine). The results of swelling rates using water, 10 % KCl, 10 % polyamine, and 5 % chitosan produced swelling rates of Mt, respectively, of 118.20, 81.4, 53.6, and 33.7 %. The results show that hydrolyzed chitosan (5 % w/v) in WBM can reduce swelling by up to 11.20 % at 250 °F (HPHT). Furthermore, the use of hydrolyzed chitosan as a shale inhibitor has improved rheological properties and reduced filtration loss of the WBDF. © 2025 Elsevier Ltd.
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, 13220, Indonesia; Department of Chemistry, Faculty of Science and Technology, State Islamic University (UIN) Syarif Hidyatullah Jakarta, Banten, Ciputat, 15412, Indonesia; Department of Mining Engineering, Faculty of Science and Technology, State Islamic University (UIN) Syarif Hidyatullah Jakarta, Banten, Ciputat, 15412, Indonesia; Badan Riset dan Inovasi Nasional, South Tangerang, 15314, Indonesia; Ministry of Energy and Mineral Resources – LEMIGAS, Jl. Ciledug Raya Kavling. 109, Jakarta, 12230, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Science, University of Jember, East Java, 68121, Indonesia; School of Chemical Sciences, Universiti Sains Malaysia, Penang, Minden, 11800, Malaysia
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