Research Status and Development Trend of Shale Hydration Inhibitors
Shale hydration inhibitors can effectively inhibit the hydration expansion and dispersion of mud shale,which is the focus of research in the current field of drilling fluid technology.Compared with oil-based drilling fluid,water-based drilling fluid is widely used in oil fields because of its low cost and environmental-friendly advantages.However,when it comes into contact with mud shale,the clay minerals in the mud shale will undergo strong hydration,causing problems such as wellbore instability.Adding shale hydration inhibitors to water-based drilling fluid is the main measure to solve this problem at home and abroad.In this paper,the properties of inorganic salts,organic salts,polymer alcohols,organoamines,hyperbranched polymers,nanomaterial shale hydration inhibitors were systematically introduced as well as the inhibition mechanism of hydration.On this basis,combined with the bottleneck problem of the current drilling fluid technology,the development trend of shale hydration inhibitors was proposed.
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