Applications of saturated salt - water drilling fluid system in 王坪井田断层分布规律及成因分析
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Unsaturated salt water drilling fluid 欠饱和盐水钻井液
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Development and applications of the solid emulsifier used to improve the performance of oil - in - water drilling fluids 有利于改进水包油钻井液性能的固体乳化剂的研制及应用
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Water drill one etc . are coming into being . all kinds of shapes and all kinds of colors . it was said that the button was coming into being in 16 century in europe which was taken back from china by " east march " cross army 据传说，欧洲是在16世纪以后才有钮扣的，是由参加"东征"的十字军从中国带回去的。
