Hydrophobic silica nanoparticle-stabilized invert emulsion as drilling fluid for deep drilling

• 来源期刊: 石油科学（英文版）
• 年，卷（期）: 2017,（1）
• 页码范围: 105-115
• 页数: 11页
• 语种: 英文
• DOI: 10.1007/s12182-016-0135-0

摘要

An oil-based drilling fluid should be stable and tolerant to high temperatures for use in deep drilling.An invert emulsion of water in oil is a good choice as an oilbased drilling fluid which is a mixture of a solid phase and two immiscible liquid phases stabilized by a polymeric surfactant.In deep drilling,due to high temperatures,the polymeric surfactant degrades and a phase separation occurs.Here,octadecyltrimethoxysilane-modified silica nanoparticles were used to form a stable invert emulsion of water in oil for the drilling fluid model which resulted in a milky fluid with the formation of 60 μm water droplets.In addition,rheological study showed that using hydrophobic silica nanoparticles resulted in a stable water in oil invert emulsion with desired properties for a drilling fluid that can be modified by adjusting the nanoparticle nature and content.Aging experiments at 120 ℃ indicated that they also have good stability at high temperatures for challenging drilling operations.