表外油层注水开发的指进现象研究

A Study on the Finger Advancement during Waterflooding stage in Untabulated Multilayer Reservoir

常规多层油藏在注水开发时由于各储层物性差异特别是渗透率的差异 ,会引起各储层油水前缘的指进现象。因此 ,在注水开发时应根据储层物性和油水前缘来合理划分层序 ,避免暴性水淹现象发生 ,从而使开发方案更有效。在表外油层的开发过程中 ,由于启动压力梯度的存在 ,使得这种情况更为突出。针对表外油层的储层特性 ,利用表外储层的渗流理论 ,推导出适合表外油层注水开发时水驱油的前缘公式 ,并利用公式进行油田实例计算 ,更好地指导这类油田的开发和生产。

Different characteristic of oil bearing strata,especially permeability contrast can arise fingering of the water oil frontal during waterflooding stage in a regular multilayer reservoir. In order to avoid severe watered out and to make efficiency of the development plan,the different character of oil bearing strata and water oil frontal should be considered before water drive exploitation. During the exploitation of untabulated reservoir,the existence of starting pressure gradient make this problem even complex.By using porous flow theory of untabulated reservoirs, this paper deviates a water oil frontal movement formula which fits waterflooding exploitation of untabulated reservoirs.