适用于复杂页岩油钻井条件的高性能润滑剂OA

Shale oil drilling is faced with challenges such as high friction,poor stability of drilling fluid additives in high-temperature high-salinity environment and increasingly stringent environment protection requirement.To address these problems,a novel ester-based lubricant LUBM-1 was developed through one-pot synthesis with raw materials such as ricinoleic acid,oleic acid,n-octanol and iso-octanol.Laboratory experiments were conducted to systematically evaluate LUBM-1 for its molecular structure characteristics and its performance in water-based drilling fluids.FT-IR characterization shows that the synthetic product has high degree of esterification and stable molecular structure.Laboratory drilling fluid experimental results show that a treatment of 1%LUBM-1 can remarkably reduce the friction coefficient of the base drilling fluid to 0.069 and the wear scar diameter,demonstrating an excellent friction reducing and wear resistant ability.The membrane formed by LUBM-1 remains stable in high-temperature and high-salinity environment;after aging at 200℃,it still reduces the friction of the drilling fluid by at least 80%,and in a drilling fluid containing 30%NaCl,LUBM-1 still retains high lubrication performance,showing excellent performance in high-temperature high-salinity environment.Water-based drilling fluids treated with LUBM-1 show good rheology,very low filtration rate,strong inhibitive capacity and low bio-toxicity which is required by"green-drilling".The results of the research show that LUBM-1 can significantly enhance the lubricity and borehole wall stabilizing performance of water-based drilling fluids,providing a reliable technical solution for complex shale oil drilling with high safety,high performance and environmental friendliness.