摘要
海上油田由于开发成本高,经济效益直接决定着油田开发后期井网加密和聚合物驱两项技术实施的可行性,经济极限井网密度的确定是海上油田开发后期的关键。为探究海上油田聚驱极限井网密度,以渤海S油田为例,通过数值模拟方法,确定油田采收率与井网密度、聚合物浓度和注聚年限的关系。利用产量递减和广义翁氏模型,建立加密聚驱增油量模型,并结合经济评价方法,获得了不同油价、注聚年限和聚合物浓度下的聚驱极限井网密度。结果表明:油价越高,注聚年限越长,聚驱极限井网密度越大;相同注聚年限下,聚驱极限井网密度随聚合物浓度的增大呈先上升后下降的趋势。总体而言,油价和注聚年限对聚驱极限井网密度的影响大于聚合物浓度的影响。研究成果为海上油田开发后期加密结合聚驱实现采收率最大化提供了理论支持。
Due to the high development costs of offshore oilfields,the feasibility of well pattern infill and polymer flooding in the later stages of oilfield development directly depends on the economic benefits.The later stage of offshore oilfield development,therefore,depends on determining the economic limit well density.Taking the Bohai S Oilfield as an example,the relationship between the oilfield recovery factor and well pattern density,polymer concentration,and polymer injection time was calculated using a numerical simulation method in order to investigate the limit well pattern density of polymer flooding in offshore oilfields.A model of infilling polymer flooding oil increase was developed using production decline and the generalized Weng's model,and then when combined with economic evaluation techniques,the polymer flooding limit well pattern density under various oil prices,polymer injection times,and polymer concentrations was obtained.The results indicate that the polymer flooding limit well pattern density increases with the oil price and polymer injection time.The polymer flooding limit well pattern density increases first and then drops with the increase in polymer concentration during the same polymer injection time.The polymer flooding limit well pattern density is often influenced more by the oil price and polymer injection age than by the polymer concentration.The research results provide theoretical support for maximizing oil recovery by infilling combined with polymer flooding in the later stage of offshore oilfield development.
作者
金一
唐恩高
张健
康晓东
王旭东
JIN Yi;TANG Engao;ZHANG Jian;KANG Xiaodong;WANG Xudong(State Key Laboratory of Offshore Oil Exploitation,Beijing 100028,China;CNOOC Research Institute Limited,Beijing 100028,China)
出处
《复杂油气藏》
2022年第3期84-90,共7页
Complex Hydrocarbon Reservoirs
基金
中海石油(中国)有限公司重大项目“渤海油田化学驱提高采收率技术”(CNOOC-KJ135ZDXM36TJ02ZY)。
关键词
聚合物驱
井网加密
极限井网密度
经济评价
渤海油田
polymer flooding
infill drilling
limit well pattern density
economic evaluation
Bohai Oilfield
