稠油油藏储层时变现象及其提液策略研究

Impact of Physical Property Changing on Liquid Extraction Strategy for Heavy Oil Reservoir

提液是海上砂岩油田增产稳产的手段,但海相砂岩强水驱开发模式下仍有些提液现象和生产特征有待进一步分析。通过对典型井的剖析,从提液后单井生产动态异常现象入手,结合单井生产压差变化,得知在油田开发过程中,疏松地层在稠油流体流动下,通过提液触发了水平井周围渗流场的重构,这种变化通过生产压差反应出来。这种物性时变及流场重构在不同程度上影响着提液效果。调整稠油油藏提液策略后,并在油田进行了实施,结果表明,油田产量得到了进一步提高。

Liquid extraction is a means of increasing production and stability in offshore sandstone oilfield, but some extract phenomenon and production characteristics need further analysis with the marine sandstone strong water flooding development mode. Based on the analysis of typical wells, we start our research from the single well pro-duction abnormal phenomenon after the liquid extraction, and find that the extract triggers reconstruction of seepage field around the horizontal well, which is shown by the production pressure difference in the process of oilfield de-velopment, because heavy fluid will flow in unconsolidated formation. These kinds of physical property changing and flow reconstruction affect the effect of liquid extraction in different degree. After adjusting the extraction strate-gy in heavy oil reservoirs, the oil production has been further improved.