适于塔里木油田克拉区块高密度钻井液的配制

Development of high density drilling fluid suitable to Kela block of Talimu Oilfield

克拉区块生储盖层钻遇第三系吉迪克组和下第三系膏盐层,含大段泥页岩和盐膏层,平均地层压力系数高.针对这一特点,优选出一种适合该区块的高密度钻井液体系,然后对塔里木油田常用加重剂、高分子聚合物增黏剂、降滤失剂进行筛选,并对处理剂的加量进行室内试验,确定出该区块的钻井液配方.该配方抑制性好,抗温性高,具有良好的流变性,高温高压滤失量低,能够满足克拉区块钻井工程及储层保护工作需要.

Jdike Formation of Neogene and the salt paste bed of Paleogene is drilled across in Kela block. There is a long segment of mud shale and salt paste bed, and the average formation pressure coefficient of the segment of rock statum is high. According to these characteristics of the statum, a sort of high density drilling fluid system suitable to the statum is selected, and then the heavy weight additives, the macromolecule polymer viscosifiers and the fluid loss additives commonly used in Talimu Oilfield are sieved, and the doses of the additives are determined by laboratory experiments. Thus, two formulations of the drilling fluid suitable to Kela block are determined, they have good inhibition, resistance to high temperature, favorable rheological property and low filter loss in high temperature and pressure. They can meet the requirement of drilling engineering and protection reservoir from damage in Kela block.