大庆油田二类油层聚合物驱实践与认识

PRACTICE AND RECOGNITION OF POLYMER FLOODING IN CLASS Ⅱ RESERVOIR OF DAQING OILFIELD

针对大庆油田二类油层的地质特点和聚驱开采特点，围绕进一步提高二类油层聚合物驱效果，逐步形成了以提高聚驱控制程度为核心的“缩小注采井距，严格注聚对象，细化开发层系，逐次上返”的二类油层聚驱开发模式，同时形成了符合二类油层特点的聚合物驱方案优化技术及改善聚合物驱效果的方法，确保了大庆油田二类油层聚合物驱提高采收率8个百分点以上的开发效果。

In order to increase the recovery of polymer flooding in Class Ⅱ reservoir of Daqing Oilfield, geologic feature and recovery feature of Class Ⅱ reservoir in Daqing Oilfield have been analyzed combing with laboratory physical simulation, numerical simulation and field practice. Regarding the low producing degree of Class Ⅱ reservoir by polymer flooding and the prominent planar conflict, this paper presents a development mode, which revolves around the key issue of polymer flooding control degree, for example ＂reducing injector ＆ producer distance, rigidly selecting polymer injection object, subdividing layer series of development, adopting upward bed-by-bed method＂, along with mature reservoir engineering support technology of zonal polymer injection and optimal polymer flooding program. The above-mentioned techniques （ technical results） guarantee that the recovery of polymer flood- ing in Class Ⅱ reservoir will increase by 8 % , providing an important guidance for the development of medium-low permeability reservoirs.