摘要
针对BZ25-1油田一期开发过程中活性软泥页岩地层出现的井壁稳定和起下钻问题,对井壁失稳的物理化学因素进行了分析。结果表明,传统的KCl等无机盐抑制剂并不适用于稳定活性软泥页岩地层,提出用软抑制及高的膜效率来稳定井壁,并构建了相应的有机正电胶钻井液。在该油田二期开发的3个平台的现场应用表明,该钻井液明显减少了憋钻具现象,降低了倒划眼起钻难度,使倒划眼时间由30～60min缩短为10min左右,使平均机械钻速提高了30%,使钻井整体时效提高了12h。
An analysis was done on the troubles encountered in the borehole stabilization and during trip through the hole penetrated the soft formations in Block BZ25-1.It was concluded that the conventional KCl polymer drilling fluids cannot be used in drilling these soft formations,and a 'soft inhibition' concept was presented in combination with an increase in membrane efficiency for borehole stabilization.An PEC drilling fluid was formulated on the basis of the analysis.the application was proved successful by field operation.
出处
《钻井液与完井液》
CAS
2009年第3期20-22,共3页
Drilling Fluid & Completion Fluid
