针对中原油田文72和文95等断块的地质特点及定向井的工程要求,设计了以KH931为主剂的新型防塌钻井液体系。室内试验和现场应用表明,该体系具有较强的抑制性、抗盐膏能力和良好的润滑性,很好地解决了这些区块的泥页岩水化膨胀导致缩径、盐膏层污染严重等问题,为这些区块的定向井钻井探索出了一条成功之路。 Aiming at the geologic characteristics of fault blocks such as Wen-72 and Wen-95 of Zhongyuan Oilfield and the engineering requirements of directional wells, a new type of anti-collapse drilling fluid system based on KH931 was designed. The results of laboratory tests and field experiments show that the system has strong inhibition, anti-salt paste capability and good lubricity, which can well solve the hydration expansion of mud shale in these blocks and lead to serious pollution And other issues, for these blocks directional drilling to explore a successful road.