Abstract
Deep wells, ultra deep wells and unconventional oil and gas exploitation have gradually become the focus of exploration and development. The oil-based drilling fluid is gradually replaced by water-based drilling fluid because of the impact of cost and environmental protection factors. In order to better replace oil-based drilling fluid, research on high-performance water-based drilling fluid has been carried out at home and abroad, and its comprehensive performance has gradually approached that of oil-based drilling fluid. The research progress and future development trend of high performance water-based drilling fluid abroad are introduced.
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