CS油田CT复杂断块低渗透油藏CO2驱动态调整研究

旨在探讨CS油田复杂断块低渗透油藏CO2驱油矿场试验过程中的动态跟踪及调整方法,利用数值模拟手段,采用"方案-实施-跟踪-调整方案-再实施-再跟踪-再调整"的方法,将理论与实际有机地结合起来。随着现场方案的实施,对注气后井口注入压力、吸气剖面、原油组分和米采油指数等指标的变化规律进行了分析,通过数模的不断模拟跟踪,适时调整注入参数。现场实际注入CO2段塞尺寸逐渐加大,累计注CO2(液态)从初期的12×104t增加到15×104t,再追加到目前的18×104t,在保持较好的增油效果和有效地控制大面积气窜的情况下,探讨低渗油藏CO2注入量和压力对混相带的影响,评价CO2混相驱的开发效果。通过上述方法使方案优化的注入参数更趋科学合理,更有效地指导矿场应用。

Study on Dynamic Adjustment of CO2 Flooding in Low Permeability Reservoirs of A Complex Fault Block

The dynamic tracking and adjustment methods in a field test of CO2 flooding of low permeability reservoirs was investigated in complex fault block of CS Oilfield.Based on the numerical simulation method,the way of "scheme-implementation-tracking-adjustment scheme-implement again-track again-adjustment again" was used by combining the theory with practice.With the implementation of field operation programs,the variation rules of injected pressure,gas adsorption profile,oil components,productivity index etc were analyzed after the injection of CO2,the numerical simulation method was used for continuous tracking and numerical simulation,the injection parameters were adjusted in real time.Field CO2 injected slug size was gradually enlarged,the cumulative injection volume of liquid CO2 was raised from 12×104t to 15×104t and then to 18×104t of the current injection volume.The optimal injection parameters are more scientific and rational,and it can be used to guide the field application.