In the drilling fluid system, main treating agents include polyalco-hol CFH-2, strong sealing agent and high temperature salt tolerant filtrate reducer OCL-PT, and so on.

• 聚合醇CFH-2具有可生物降解性；既能提高体系的抑制性、润滑性及储层保护性能；又可满足环保要求; 抗高温降滤失剂OCL-PT能有效地降低饱和盐水体系在高密度(2.；32g/cm。)