河流-三角洲相储层特高含水期产层特征

胜坨油田广泛发育河流-三角洲相储层,根据特高含水期储层非均质性特征及剩余油分布模式,将其产层分为3种模式:正韵律模式、反韵律模式和均质模式.通过研究不同产层模式生产井的提液效果差异,建立了不同产层模式采油指数与生产压差之间的关系,并从毛管力的角度阐述了不同产层模式的开发特征.研究结果表明,储层物性非均质性和剩余油分布非均质性共同控制了产层的开发特征,受毛管力作用方式的影响,正韵律产层模式层间、层内干扰最为严重,开发效果相对较差;反韵律产层模式层间、层内干扰不明显,适合开展强注强采;均质产层模式是最为理想的产层组合方式.只有将储层物性差异以及剩余油分布差异最小的产层组合在一起才是合理的.

Producing-formation characteristics of fluvial-delta reservoir in high water-cut stage

In Shengtuo Oilfield,fluvial-delta reservoir widely develops.According to the heterogeneities of reservoir and remaining oil distribution,the producing formations in high water cut stage are classified into three patterns:positive-rhythm mode,reverse-rhythm mode and homogeneous mode.The relationships between productivity index and producing pressure drop of the producing wells of different producing formation patterns are established through studying the change of oil producing capacity of the producing wells before and after liquid extract.And the production characteristics of the wells of different producing formation patterns are expounded according to capillary pressure.The study indicates that the difference in the heterogeneities of reservoir property and remaining oil distribution controls the production characteristic of the producing formations,and the capillary pressure plays an important role in the exploitation of different producing formation patterns.As a result,the producing formations of positive-rhythm mode have the most serious inter-layer interference and in-layer interference,and their exploration results are worse;the inter-layer interference and in-layer interference of the producing formations of reverse-rhythm mode are not obvious,the producing formations are suitable to intensive injection and production;the homogeneous producing formation pattern is an ideal producing-formation combination mode,the combination of the producing formations with minimum difference in the heterogeneities of reservoir property and remaining oil distribution is the most reasonable.