樊家川区块位于甘肃省环县境内，主要开发长8油层，水平井井深在3300-3700米左右，水平段大多在600-900米，本文通过分析该区块钻井液施工难点，引入无机盐增强钻井液抑制性及提高钻井液密度的力学方式来控制易塌地层，从而达到高效施工的目的。
陇东区块大型漏失井普遍存在地层水活跃，漏失静液面低，漏层承压能力弱等特点。针对部分漏失井存在漏层空间大、堵漏材料无法架桥滞留、注水泥漏层处不成塞的现象。现场实验了环空送入石子填充技术、高强度米石挤压堵漏技术、3H承压堵漏技术、钻具下穿漏层注水泥堵漏技术，从而提高了大型漏失井堵漏成功率，大幅度降低了堵漏损失时间和成本。以上堵漏技术具有较高推广价值。
Faced with the pressure from reducing cost and increasing penetration rate, the drilling fluid system is optimized,and the ultra-low clay and crude oil mixed drilling fluid system is successfully applied in two wells of horizontal sections over 600 m.The content of clay is limited but the content of ultra-fine calcium carbonate is increased, and K.C1 is used to improve inhibition, also the crude oil modifies the lubricating performance.
