林玉保
LIN Yubao

• 1:大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

油田长期注水开发后,油层油水分布、储集层岩石物性及流体渗流方式等均发生变化。为更好地认识水驱后储层物性变化及流体渗流特征,分析了高含水后期储层油水渗流规律,利用天然岩心高倍水驱实验、平面填砂模型水驱实验及压汞实验分析结果,阐述了高含水后期储层优势渗流通道的形成机理。结果表明:储层优势渗流通道的形成有3个重要因素,一是砂岩储层的非均质性;二是长期水驱后,高渗透层岩石孔喉半径增大、油水渗流通道变宽;三是高含水后期水流动能力增加、流度比增大,油水渗流特征发生变化。研究成果为高含水后期油层优势渗流通道的识别与治理、油田的有效开发提供了理论及实验依据。
After long-term water injection development,the oil and water distributions,the reservoir physical properties and the fluid seepage patterns have all changed. In order to make better clear of the understandings of the property changes and the fluid seepage characteristics after the waterflooding,the oil and water flow laws at the late stage of the high watercut were analyzed,with the help of the analyzed experimental results of the high-multiple and planar-sand-packed-model waterfloodings moreover the mercury injection for the natural core,the forming mechanism of the preferential seepage channel of the reservoir at the late stage of the high watercut was stated. The achievements show that there are three important factors for the formation of the preferential seepage channel: sandstone reservoir heterogeneity; increased pore-throat radii and widened oil/water flow channels of the high-permeability reservoir rocks after the long-term water flooding; enhanced water flowability and increased mobility ratio at the late stage of the high water cut,and moreover the changed characteristics of the oil and water flow. The research achievements have provided the theoretical and experimental evidences for the identification and management of the preferential seepage channel and moreover the effective development of the oilfield.

关键词(KeyWords)： 高含水;非均质性;孔喉半径;优势渗流通道
high watercut;heterogeneity;pore throat radius;preferential seepage channel

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份公司重大科技专项“长垣油田水驱开发技术”(2011E-1205)

作者(Author): 林玉保
LIN Yubao

DOI: 10.19597/J.ISSN.1000-3754.201803050

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