海上油田早期注聚开发特征及注入方式研究

Study on the Characteristics and Development Pattern of Early Polymer Flooding in Offshore Oilfields

鉴于海上油田开发平台寿命的时效性和开发投资的风险性,决定了海上油田实施聚合物驱技术应突出一个"早"字。针对渤海典型油田油藏特点,通过油藏工程方法和数值模拟手段研究了海上早期注聚的注入时机、注入压力特征、注入方式和开发效果。研究表明,与陆地传统聚合物驱模式相反,海上油田早期注聚的注入方式适宜先注低浓度聚合物溶液后注高浓度聚合物溶液的组合驱替方式,以达到将聚合物驱注入时机提前和使油田开发全过程保持较高的注采速度的目的。早期注聚开发模式在L油田现场实施后,采油速度一直维持在近3%,使油田保持了较旺盛的生产能力,证明海上油田实施早期注聚及其开发模式是可行和高效的。

Because of the service lifetime of offshore platform and the risk of development investment , polymer flooding in offshore oilfield should be attention to ' early ' time.In allusion to offshore oilfield development characteristics , the injection time , feature of pressure squeezing , injection pattern and development effect of early polymer flooding were studied with reservoir engineering and numerical simulation.The results show that the combination of earlier and proper injection of low concentration of polymer solvent and injection of high concentration of polymer solvent is used in polymer flooding , which is in contrary with the traditional mode of land-oilfields , it is for the purpose of advancement of injection time and maintaining high velocity of production from low to high concentration combination system.The early polymer injection pattern is used in L Oilfield , the production velocity has been maintained in about 3% , by which higher production capacity is kept in the oilfield.It is proven that it is feasible for carrying out early polymer flooding and its oil development pattern in offshore oilfields.