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Construction and Evaluation of High Temperature Oil-based Drilling Fluid System Based on Micro-crosslinked Emulsifier
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Abstract
Oil-based drilling fluids have significant advantages in shale gas drilling due to their high-temperature resistance, resistance to calcium invasion from salts, and excellent lubrication properties. This paper selects oleic acid and tetraethylenepentamine as two key raw materials and develops a primary emulsifier capable of withstanding temperatures up to 180℃ through a process of amide reaction followed by micro-crosslinking polymerization. Additionally, it evaluates and selects key additives such as secondary emulsifiers, organic clays, fluid loss reducers, and wetting agents. A stable oil-based drilling fluid system with emulsification performance suitable for shale gas well development conditions is optimized: 2.5% primary emulsifier + 2.5% secondary emulsifier + 1% wetting agent + 2~4% organic clay + 5% fluid loss reducer + 3% CaO + barite. Ultimately, a drilling fluid system with a density of 1.5~1.9 g/cm³, an oil-water ratio of 80:20, and a tem-perature resistance of up to 180℃ is obtained. After aging at 180℃ for 16 hours, the demulsification voltage is above 1000V, the rheological properties are good, the high-temperature high-pressure fluid loss is less than 10 mL, and the sedimentation stability is excellent after standing for 5 days at 180℃.
References
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How to cite this paper
Construction and Evaluation of High Temperature Oil-based Drilling Fluid System Based on Micro-crosslinked Emulsifier
How to cite this paper: Qingning Ye. (2025). Construction and Evaluation of High Temperature Oil-based Drilling Fluid System Based on Micro-crosslinked Emulsifier. Engineering Advances, 5(1), 15-20.
DOI: http://dx.doi.org/10.26855/ea.2025.01.003
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