Hydrophobic silica nanoparticle-stabilized invert emulsion as drilling fluid for deep drilling
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- 作者：Maliheh Dargahi-Zaboli ; Eghbal Sahraei ; Behzad Pourabbas
- 关键词：Deep drilling ; Drilling fluid model ; High ; temperature aging ; Rheology ; Silica nanoparticles ; Stable invert emulsion
- 刊名：Petroleum Science
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：14
- 期：1
- 页码：105-115
- 全文大小：998KB
- 刊物主题：Mineral Resources; Industrial Chemistry/Chemical Engineering; Industrial and Production Engineering; Energy Economics;
- 出版者：China University of Petroleum (Beijing)
- ISSN：1995-8226
- 卷排序：14
文摘
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 oil-based 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 °C indicated that they also have good stability at high temperatures for challenging drilling operations.