为解决苏里格气田水平井钻遇泥页岩地层存在的水化膨胀缩径和严重造浆问题,开发了一种强抑制胺基防塌钻井液体系.室内性能评价实验表明,该钻井液体系具有良好的抑制性、很强的抗温、抗钙、抗污染能力,对气层伤害很小,属于清洁水基钻井液体系.在苏里格气田现场应用3 口井取得了良好的效果,表明该钻井液体系有利于提高苏里格气田泥页岩地层井壁的稳定性,解决泥页岩地层钻井液流变性难控制的难题,实现保护储层的要求,能够满足苏里格气田钻井的需要.
During the drilling operation of horizontal wells in Sulige gas field,tight hole and severe mud-making formations are often encountered in shales. A new high inhibintion amino anti-sloughing drilling fluid system is developed to solve these difficulties. An evaluation of its capability shows that the inhibitor has a good compatibility with common drilling fluid,and is useful to maintain drilling fluid stability under a high temperature and improve the filtration property of drilling fluid. The organic amine base drilling fluid system has good inhibition,a strong anti-temperature,anti-calcium and anti-pollution ability,and creates less damage to the formation. It is a clean water-based drilling fluid system. The results of field application show that the drilling fluid can improve hole stability, solve poor reheology during drilling across shale formation,realize formation protection,and meets the need of drilling in Sulige gas field, having a broad prospect of applications.
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