摘要
以油藏数值模拟为手段对渤19断块的水驱进行综合评价,结果表明:渤19断块目前各油层采出状况很不均衡,主力油层“顶端优势”加剧——采出程度高、含水高,原主力油层的剩余储量仍然保持其主力地位。基于目前井网,对层系的数值模拟预测的水驱采收率仅为35.4%。在水驱研究的基础上,对该断块进行聚合物驱和交联聚合物驱数值模拟优化研究,结果表明:以第一段塞0.05PV(聚合物浓度2000mg/L,交联剂浓度800mg/L)加第二段塞0.20PV(聚合物浓度1500mg/L,交联剂浓度600mg/L)的交联聚合物驱为最优方案,最优方案下的吨聚合物增油为86t,可提高原油采收率8.42%。
Waterflooding evaluation of Bo 19 block has been performed by means of numerical simulation.It has been shown that recovery is uneven for all the productive layers,major layers become deterioated with high recovery and high water cut,major productive layers will remain its orignal status from current reserves left.Water fiooding recovery will be 35.4% based on the current recovery means and well pattern. Polymer and cross linked polymer flooding simulation have been performed with chemical flooding simulator after waterflooding evaluation, and optimum scheme has been obtained, 86 ton incremental oil per ton polymer and 8.42% of additional oil recovery can be reached with 0.05PV slug (2000mg/L polymer and 800mg/L cross linked agent) plus 0.2 PV slug (1500mg/L polymer and 600 mg/L cross linked agent).