铁边城地区长6油藏动态缝的识别及防治技术

Identification and Prevention of Dynamic Fracture in Chang6 Reservoir in Tiebiancheng Area

铁边城长6油藏位于鄂尔多斯盆地中部,储层为典型的低孔低渗低压储层。油藏注水开发后,随着地层压力不断升高,油藏微裂缝逐渐向开启动的动态缝转变,造成位于动态缝方向上的油井出现水淹,而垂直于动态缝方向上的油井却不受效或受效甚微,影响注水油藏开发效果,因此识别油藏动态缝及其开启方向和开启规模对于注水开发油藏尤为重要。采用动态分析法和测试法综合应用,可有效预测动态缝的开启方向和开启规模;采用动态缝防治结合技术,可缓解和降低动态缝对油藏开发的影响。

Tiebiancheng chang6 reservoir is located in the middle of Ordos Basin,and the reservoir is a typical low porosity,low permeability and low pressure reservoir.After the water injection development of the reservoir,with the rising of the formation pressure,the micro fractures of the reservoir gradually change to the dynamic fractures that are started,causing the oil wells located in the direction of the dynamic fractures to be flooded,while the oil wells perpendicular to the direction of the dynamic fractures are not or have little effect,affecting the development effect of the water injection reservoir.Therefore,it is particularly important to identify the dynamic fractures of the reservoir,their opening direction and opening scale for the water injection development reservoir.The opening direction and opening scale of dynamic joint can be effectively predicted by the comprehensive application of dynamic analysis method and testing method;The combination of dynamic fracture prevention and control technology can mitigate and reduce the impact of dynamic fracture on reservoir development.