摘要
由于对地下裂缝的分布和裂缝开度难以准确把握,加上钻井完井液中的固相粒度分布缺乏广泛适用性,在钻遇裂缝性地层时往往无法形成有效封堵。为解决该问题,提出了较为准确测量裂缝开度的裂缝性岩心评价方法,并建立了裂缝开度与渗透率之间的对应关系,达到了系统评价裂缝渗流特性的目的。同时优选出了新型纤维状暂堵剂和多种粒径颗粒级配的复合封堵剂。岩心污染与流动实验结合技术的评价结果表明,新型钻井液纤维状暂堵剂和复合封堵剂可以有效防止钻井液在裂缝性地层的漏失,改善储层渗流能力,提高对裂缝性储层保护效果。
Efficient sealing of fractures encountered during drilling are generally hard to seal off because of the inaccurate understanding of the distribution and opening of these fractures,as well as the comparatively narrow distribution of the plugging particles in drilling fluids.A fracturing core evaluation method is presented to accurately measure the opening of the fractures,and a relationship between the fracture opening and formation permeability is established.Using this method,an optimized cellulosic temporary plugging agent is evaluated for its efficiency in sealing fractures.The evaluation results showed that a wide particle size distribution can prevent drilling fluids from losing into fractures more efficiently,and flow through porous media is improved,thus protecting the fracturing reservoir from being damaged.
出处
《钻井液与完井液》
CAS
2009年第3期16-19,共4页
Drilling Fluid & Completion Fluid
关键词
裂缝性储层
防止地层损害
临时性封堵
封堵剂
岩心评价
Fracturing reservoir
Formation damage prevention
Sealing and plugging agents
Core evaluation
