抗高温海水无黏土相钻井液研究

Research on High Temperature Seawater Base Clay-free Drilling Fluid System

通过室内研究,优选出适用于抗高温海水无黏土相钻井液的增黏剂、降滤失剂、润滑剂和防塌抑制剂等,研制了抗高温海水无黏土相钻井液。其性能评价结果表明:该海水无黏土相钻井液耐温达150℃,同时具有较好的抗膨润土污染能力,润滑性和防塌性较好;体系易于控制,能有效减少井下事故的发生,提高钻进速度;岩心渗透率恢复率大于93%,具有较好的储层保护效果。

A high temperature seawater base clay-free drilling fluid system is developed based on the optimized additives,such as viscosifier,filtrate reducer,lubricant and inhibitor.The performance evaluation results show that drilling fluid system is stable at 150℃,provides high anti-pollution capacity of bentonite and good lubricating performance,moreover,the core penetration rate recovery rate is more than 90% that can protect reservoirs effectively.