鄂尔多斯盆地浅层大位移水平井钻井液体系优选

Optimization of Drilling Fluid System for Shallow Extendedreach Horizontal Well in Ordos Basin

摘要:

针对鄂尔多斯盆地浅层水平井钻井过程中的井壁稳定、井眼清洁、润滑减阻和储层保护的技术难题，通过分析储层的地质特征，在该区原用聚合物钻井液基础上，选择性加入MC-VIS、ABSN、纳米乳液和复合屏蔽暂堵剂，形成纳米乳液封堵钻井液体系，在保证施工安全的前提下，可将岩心渗透率恢复提高至8350%。通过七平1井的应用表明，纳米乳液封堵钻井液体系能够满足低渗透油层大位移水平井的钻井施工需求，为高效开发鄂尔多斯盆地浅层油气藏提供技术支持。

Abstract:

In order to solve the hard technical difficulties of wellbore stability, boreholecleaning, lubricating & resistance reducing and reservoir protection for shallow horizontal well drilling in Ordos basin, by the analysis on the geological characteristics of the reservoir and based on the previous use of polymer drilling fluid, MC-VIS, ABSN, nanoemulsion and composite shielding temporary plugging agent were selectively added to develop a nanoemulsion plugging drilling fluid system. On the premise of safety drilling, the core permeability was restored up to 8350%. By the application in Qiping 1, it is showed that the nanoemulsion plugging drilling fluid system can satisfy drilling construction requirements of shallow extendedreach horizontal well in low permeability reservoir and provide technical support for efficient exploiting shallow reservoirs in Ordos.