裂缝性灰岩油藏堵水酸化联作技术研究与试验

Study and field test of integrated plugging and acidizing technology in fractured limestone reservoir

裂缝性灰岩油藏普遍存在开发初期见水快、含水升高快的问题,采用堵水酸化联作工艺技术解决了此类问题。以大港油田王徐庄油田为研究目标,进行了裂缝定量预测和定性预测方法研究,建立了堵水酸化联作工艺技术的数值模型和基于数值模拟的设计方法,进行了数值模拟研究。数值模拟结果能够解释现场应用时的各种现象和效果,揭示了本项技术的堵水机理、酸化沟通机理、堵剂对酸液的转向和缓速机理、酸化增强堵水的选择性机理,优选了堵水酸化联作工艺技术的各种处理药剂。在大港油田进行了5口井的现场应用,效果良好。此项技术不仅为王徐庄油田找到了新的增产、控水技术手段,也为其他裂缝性灰岩油藏的开发措施提供了借鉴。

Fractured limestone reservoirs suffer a high water-cut problem, which leads to water-cut increase rapidly. In this paper, the integrated plugging and acidizing technology is introduced to solve the problem. The Wangxuzhang Oilfield is selected for study and application target. The methods for predicting reservoir fracture are concluded. Numeric and physical models for this are established. With the models, the mechanism of the technology is investigated. The mechanism is selected water plugged with acidizing and slowed acidizing. At last, five successful application examples are obtained in Wangxuzhang Oilfield. Indoor study and field application show the integrated plugging and acidizing technology is both technical and cost effective to mature fractured limestone oil reservoir.