利用分层与控水压裂一体化工艺提高剩余油动用程度研究

The Study of Separate Layer Fracturing Integrated with Water Control Technology in Low Porosity and Low Permeability Multilayer Reservoir

随着油田开发的不断进行,许多低渗透油田进入含水期,产油量逐渐下降、含水上升,使油田生产面临着严峻考验,以往大多采用人工隔层控缝高的方法来控水压裂,而对现有井网与人工裂缝的匹配关系确定剩余油的分布研究较少,对于在多层中既控水压裂又有效提高多层中剩余油分布的压裂工艺研究更少。在前人研究基础上,分析应力特征与井网的特点,判断剩余油分布及裂缝特征,对多层进行投球和新型改变润湿性堵水剂的控水压裂,同时对裂缝转向有利方位提出转向压裂技术,实现了多薄层分层、控水与压裂一体化的工艺技术,使工艺技术的针对性更强,现场应用初见成效,对我国目前大部分中高含水油田后期剩余油的储层改造工作提供一定借鉴意义。

With the ongoing oil field development,many low-permeability oil fields become the water-cut stage,gradually declining oil production,increased water content,layer and layer and non-equilibrium between layers become increasingly prominent.The general measures of profile control has certain limitations and the use of general hydraulic fracturing can not be combined successfully to achieve the purpose of the reservoir,the effect of measures to increase production by injection is not ideal.Therefore,the application needs to be redesigned by separate layer and control of water fracturing process to achieve the aim of control water and improve production.In this paper,using the oil wells of Huabei oilfield as an example targets,the technique can be made by studying the multi-layered and control water fracturing integration and the results are good.This technology provide a reference information to the majority of China’s current high water cut oilfield in the latter development stage,it also has a the far-reaching effects to the development work of oil field.