摘要
对裂缝性油藏建立了以毛管自吸为主要采油机理的数学模型，并对影响裂缝性油藏采出程度的敏感参数进行研究，结果表明：对于等温渗流过程，裂缝密度是影响采出程度的主要因素，裂缝密度越大，采出程度越高；当裂缝系统充填有高温流体时，岩块表面温度对采出程度的影响大于裂缝密度，温度的升高通过降低原油粘度、增加弹性能量和改善岩石表面的润湿性增加最终采收率；采出程度随裂缝密度呈指数变化规律。
mathematical model taking spontaneous imbibition as main recovery
mechanism for fractured reservoir has been built, and sensitivity study on recovery was
performed. It has been shown that fracture density is the major effect factor on imbibition for
isothermal process, the greater the density, the higher the recovery. While fractures is filled
with high temperature fluid, the effect of temperature at rock surface on recovery is greater than
fracture density. Changing temperature can decrease crude viscosity, increase the elastic
energy and improve wettability of rock surface, and enhance the ultimate oil recovery. Recovery
shows an exponent trend to fracture density, and decline index is related to matrix surface's
temperature.
关键词
裂缝性油藏
模型
渗吸作用
fractured reservoir, matrix, imbibition, capillary pressure, model
