大庆油区长垣油田聚合物驱后优势渗流通道分布及渗流特征  

Dominant flowing channels distribution and seepage characteristics after polymer flooding in Daqing oilfield

作　　者：刘海波[1] 

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《油气地质与采收率》2014年第5期69-72,115,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05010)

摘　　要：聚合物驱后优势渗流通道的存在导致波及体积减小,从而影响采收率的进一步提高。如何有效地描述优势渗流通道的分布及渗流特征成为大庆油区聚合物驱后油藏开发中亟待解决的难题。根据大庆油区长垣油田聚合物驱后20口密闭取心井资料,给出了聚合物驱后优势渗流通道的定义,结合新钻井水淹层解释资料确定其分布特征,即聚合物驱后优势渗流通道厚度比例比水驱后增加了9.3%,纵向上主要存在于厚油层底部,平面上大面积分布。在此基础上,利用物理模拟、数值模拟等手段,研究了聚合物驱后优势渗流通道的渗流特征,A试验区优势渗流通道厚度比例为19.8%,分流率却达到50%以上,无效循环严重。该研究结果为后续调堵工艺设计提供了依据,可以进一步提高聚合物驱后采收率。The existence of dominant flowing channels after polymer flooding leads to low sweep efficiency and then further results of low recovery factor. So it is urgent to solve the problem of how to describe the distribution and seepage characteristics of dominant flowing channels effectively in the process of Daqing oilfield development after polymer flooding. According to the data of pressure cored wells and logging, the definition and distribution features of dominant flowing channels are determined after polymer flooding, then their seepage characteristics is studied by physical modeling and numerical modeling, etc. The thickness percentage of dominant flowing channels is increased by 9.3% than that before polymer flooding. They are mainly concentrated in the thick oil layers vertically and distribute in a wide range horizontally. The thickness percentage of dominant flowing channels is about 20%, but the flux ratio of them can reach up to more than 50% leading to serious invalid circulation. The study of dominant flowing channels distribution and seepage characteristics after polymer flooding provides a foundation for following plugging scenario design, which can further enhance oil recovery after polymer flooding.

关 键 词：聚合物驱后 优势渗流通道 分布特征 渗流特征 大庆油区 

分 类 号：TE357.431[石油与天然气工程—油气田开发工程]