一种精细表征底水油藏全周期水淹形态的新方法  

A new method for fine characterization of full⁃cycle waterflooded morphology in bottom water reservoirs

作　　者：常涛 陈建波 汪跃 孙藏军 卢美月 CHANG Tao;CHEN Jianbo;WANG Yue;SUN Cangjun;LU Meiyue(Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《大庆石油地质与开发》2024年第6期106-113,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“渤海油田高效开发示范工程”(KJGG2021-0501)。

摘　　要：底水油藏开发面临含水上升快、采收率低等难题,需要精细表征水淹形态,指导开发后期精准挖潜。以底水油藏水平井开发为例,通过建立数学模型,并在生产特征分析、空间势分布求取及流线绘制基础上,基于油水运动规律、相渗曲线特征等研究,建立底水油藏全周期水脊内部形态的精细表征方法。结果表明:随含水率的增加,水脊内部水淹形态发生明显变化,中、强水淹区范围逐渐缩小;进入特高含水期,水脊内部仍可进一步划分为未动用区、弱水淹区、中水淹区、强水淹区,且未动用及弱水淹区范围较大,说明常规认识的水脊内部依然存在较大的调整潜力。将该方法计算结果与数模、实际取心井资料对比,误差小于等于7.7%,准确率较高。研究成果可为底水油藏后期开发调整提供理论指导。The development of bottom-water reservoirs faces challenges of rapid water cut rise and low recovery,requiring fine characterization for waterflooded morphology to guide exact potential tapping in later development stage.Taking horizontal well development in bottom water reservoir as an example,mathematical model is established to calculate spatial potential distribution and plot streamlines based on production characteristics analysis,thereby fine characterization method for full-cycle internal morphology of water crest in bottom water reservoirs is established based on study of oil and water movement laws and relative permeability curve characteristics.The research shows that with increase of water cut,water flooded morphology inside water crest changes significantly,and the range of medium and strong water flooded zones gradually decreases.During ultra-high water cut period,internal water crest is still further divided into unproduced zones and weak,medium and strong water flooded zones,with larger range of unproduced and weak water flooded zones,indicating still much adjustment potential inside water crest of conventional understandings.Calculation result of this method has error of≤7.7%compared with numerical simulation and actual coring well data,with high accuracy.The research provides theoretical guidance for later development and adjustment of bottom water reservoirs.

关 键 词：底水油藏 水脊 水淹特征 内部形态 精细表征 

分 类 号：TE349[石油与天然气工程—油气田开发工程]