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深井、超深井中井下温度和压力高,井下钻井液密度变化较大,易引发一些复杂事故的发生。利用石油大学(华东)泥浆研究室研制的高温高压钻井液密度模拟试验装置,针对欠平衡深井钻井用的一种水包油钻井液体系,开展了高温高压条件下的钻井液密度特性模拟实验研究,为进一步开展井下钻井液静液柱压力的预测研究奠定了基础。研究结果表明,同一油水比水包油钻井液在同一温度下,密度随压力呈线性上升趋势,且两种温度下的上升斜率基本相近,在同一压力下密度随温度上升而下降;在不同油水比条件下,每种水包油钻井液在同一温度下,密度随压力上升的斜率基本相近,在同一压力下密度随油水比增大而下降。
In deep and ultra-deep wells, the downhole temperature and pressure are high, and the density of downhole drilling fluid varies greatly, which can easily lead to some complicated accidents. A high temperature and high pressure drilling fluid density simulation test device developed by the University of Petroleum (East China) Mud Laboratory was developed to simulate the drilling fluid density under high temperature and high pressure for an oil-in-water drilling fluid system for underbalanced deep well drilling , Which lays the foundation for further research on prediction of hydrostatic column pressure in drilling fluid. The results show that the same oil-water drilling fluid at the same temperature than the oil-in-water, the density showed a linear upward trend with pressure, and the rising slope of the two temperatures are similar, at the same pressure, the density decreases with temperature rise; in different oil and water Under the same conditions, the density of each oil-in-water drilling fluid at the same temperature increases with the slope of the pressure is basically the same, at the same pressure, the density decreases with the increase of the oil-water ratio.