双重介质低渗透储层压裂技术研究与应用

针对下二门油田梨树凹区块低孔、低渗储层,存在层间收缩缝、砾间缝等多种天然裂缝,具有明显的双重介质储层特征,结合勘探开发过程中的压裂改造实践,对压裂工艺及施工参数进行了优化研究配套,较好地解决了储层压裂易早期砂堵的问题。5井次压后获得高产油流或工业油流,为梨树凹区块储量升级提供了重要依据。

Research and application of fracturing technology for dual-media reservoirs with low-permeability

Lishuwa area in Xiaermen oilfield is a reservoir with low porosity and permeability, exists different kind of natural fractures as intrabed shrinkage joint and breaks in gravel, indicating apparent characteristic of dual-media reservoir. Excessive loss of fracturing fluid and early sand block resulted from natural fractures restricts the development of the oil field. The problem as early sand block of the reservoir during fracturing is solved by the technologies including multi-small test technology, multi-stage loss reducing technology with powder earthenware, multi-stage sand addition with varying volume，fractional bridging sanding technology with proppant agent slug, spiral sand addition and optimization of fracturing parameters. Large oil stream or commercial oil flow was obtained for 5 wells/times after fracturing. It provides significant foundation of reserve upgrade for Lishuwa reservoir.