Chinese design drilling fluids for Tuha’s Jurassic sandstone

New drilling fluids prevent formation damage in a sandstone reservoir in northwest China’s Turpan Hami (Tuha) basin. The Tuha oil field is the only integrated condensate-gas field development in the Turpan Hami Oil field Branch, Shanshan, Xinjiang Uygur autonomous region of China.Low-permeability, dense reservoirs are commonly characterized by a high content of clays, high original water saturation, high sensitivity to invasive fluids, high capillary pressure, complicated structure and anisotropic, and high flow-resistance.Generally, these reservoirs also contain numerous natural microfractures, probably leading to stress sensibility. This article reviews the geological characterist...

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