Title: The Study of the Characteristics of Formulated Oil Based Mud Using Neem Seed (Azaditachta Indica) and Diesel Oil as Base Oil
Authors: Mfon I. Otite-Douglas, Mukoro Promise Othuke
Volume: 9
Issue: 1
Pages: 48-53
Publication Date: 2025/01/28
Abstract:
Drilling mud, or drilling fluid, is an important component in the drilling process, serving multiple functions such as cooling and lubricating the drill bit, transporting cuttings to the surface, and maintaining wellbore stability. The formulation of effective drilling muds is essential for optimizing drilling performance and ensuring safety in challenging environments. This study formulated drilling mud using neem seed oil as the base oil, focusing on its chemical composition, physical properties, and performance compared to conventional diesel oil-based drilling muds. Neem seed oil was extracted using soxhlet apparatus. The oil exhibited a boiling point of 220 °C, significantly higher than standard diesel oil (152), indicating enhanced thermal stability. Key properties such as density (0.920 g/ml) and aniline point (118 °C) suggest improved performance in high-temperature drilling environments. The neem seed oil-based mud (NBM) showed superior rheological properties, with a plastic viscosity of 66 cP and yield point of 168, compared to diesel-based mud (DBM). Despite slightly higher fluid loss (17 ml vs. 12 ml), NBM's overall performance indicates better cuttings transport and wellbore stability. However, at 120 °C, NBM may struggle due to significant changes in rheological properties, leading to reduced yield stress and yield point, which may compromise wellbore stability. The decrease in gel strength raises concerns about cuttings suspension when circulation halts, risking blockages. While NBM can function as a drilling fluid, its effectiveness may be compromised at high temperatures, necessitating modifications to enhance performance and mitigate operational risks.