延长油气田储层改造技术研究

Study on Reservoir Reconstruction Technology of Yanchang Oil and Gas Field

延长油田油区横跨鄂尔多斯盆地陕北斜坡、渭北隆起和天环拗陷三大地质构造单元,其中,陕北斜坡带为其主要勘探开发区域。油藏发育有侏罗系延安组和三叠系延长组,其中延长组属特低渗岩性油藏。当前,水平井分段压裂开发超低渗油藏已成为提高油田储量动用程度和改善开发效果的重要手段。经过近几年不断发展,延长石油在水平井分段压裂技术领域取得了技术突破,建立起比较完整的水平井分段压裂技术与井网优化设计方法,形成了水平井双封单卡分段压裂技术、封隔器滑套分段压裂技术、连续油管拖动压裂、水力喷砂分段压裂技术、套管水平井泵送桥塞射孔联作分段压裂工艺等主体技术。

Yanchang oilfield spans three tectonic units including north shaanxi slope, Weibei uplift and Tianhuan depression in Ordos basin. There are Jurassic Yanan formation and Triassic Yanchang formation, among which Yanchang formation belongs to ultra-low permeability lithologic reservoir. The development method of supplementing energy is only way to achieve better development effect and higher recovery rate. After the development in recent years, horizontal well staged fracturing technology in Yanchang petroleum company has made technical breakthrough, a relatively complete horizontal well staged fracturing technology and the network optimization design method were established. Packer slip sets of staged fracturing technology, coiled tubing drag fracturing, hydraulic sand staged fracturing technology, horizontal well casing pumping bridge plug perforating staged fracturing techniques and so on were formed.