广谱“油膜”暂堵剂在油层保护技术中的应用

针对油层非均质性强、孔径分布范围较宽、油层孔径难以准确预知,常规屏蔽暂堵技术几乎无法实现对整个油层井段的保护、油层保护效果差等特点,设计了广谱“油膜”暂堵型保护油层钻井完井液体系,并进行了室内系统评价和现场应用。结果表明,当广谱“油膜”暂堵剂GPJ的加量达到3%时,可在近井壁处形成很好的屏蔽暂堵“油膜”带,渗透率堵塞率和恢复率皆大于90%,与常规屏蔽暂堵技术相比,可使油层损害程度降低7.4~10倍,产量提高1.82~2.96倍,而且与油层渗透率和温度无关。

Application of a Broad-spectrum Oil-film Temporary Plugging Agent to Reservoir Protection

In view of the reservoir characters of severe heterogeneity,wide pore radius distribution,unpredictability of pore radius,and unrealized protection for whole hole section and bad protection effect by conventional shielding temporary plugging technology,we designed a broad spectrum oil film temporary plugging drilling and completion fluid system for reservoir protection.The in-house system evaluation and field application showed that an excellent oil film for shielding temporary plugging could be formed near borehole wall and both plugging and recovering rates of permeability reached more than 90% when the added amount of the broad spectrum oil film temporary plugging agent GPJ reached 3%;skin factor decreased by 7.4 to 10 times and production increased by 1.82 to 2.96 times compared with conventional technology.