底水油藏水平井沿程水淹识别  

Identification of water flooding along horizontal wells in bottom water drive reservoir

作　　者：郑强[1] 刘慧卿[1] 薛海庆[2] 李媛媛[3] 王长久[1] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]中国石化股份河南油田分公司第二采油厂,河南南阳473415 [3]中国石化股份胜利油田分公司河口采油厂,山东东营257200

出　　处：《油气地质与采收率》2012年第1期95-98,117-118,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"蒸汽驱后稠油油藏提高采收率技术研究"(2011ZX05009-004-05)

摘　　要：水平井沿程的不均匀见水主要是由地层非均质性和井筒压降所致。利用贝克莱—列维尔特方程和井筒压降方程,针对裸眼完井的水平井,建立了底水油藏水平井井筒变质量流与地层两相渗流的耦合模型,通过该模型可以求解地层中不同渗透率分布时水平井井口在不同时刻的含水率,通过对高渗透带的渗透率、宽度和位置进行敏感性分析,研究水平井见水的影响因素。根据塔河油田某井的实际资料建立地质模型,调节井筒沿程高渗透带位置,绘制了含水率随时间变化的图版,通过与实际含水率变化曲线相比,确定井筒沿程的高含水率位置。结果表明,高渗透带位置是影响水平井井口含水率变化的主要因素,通过井口含水率的变化曲线可以反求高渗透带的大致位置;封堵沿程高含水带,还可有效降低井筒跟端底水脊进程度,从而进一步降低井口含水率。The fluctuation of water breakthrough along horizontal wells is mainly caused by the heterogeneity of the formation and the wellbore pressure drop.In this paper,Buckley-Leverett's principle on displacement of oil with water and wellbore pressure drop equation are used to establish a coupling model,from which we can get the water cut in well head with different distributions of permeability,between the variable mass flow in horizontal wellbore in bottom-water drive reservoir and the two phase flow in the formation.To study the affecting factors on water breakthrough of horizontal wells,sensitivities of the size,the width and the position of high permeability zone are analyzed.We establish the geological model by the actual parameter of some well in Tahe oilfield.We change the position of high permeability zone and plot a chart formed by curves of the relationship between water cut and time in all cases,and then the right position of high permeability zone is located by comparing the actual curve with the chart.The result shows that position of the high permeability zone is the main factor that affects water cut of horizontal well head and can be approximately obtained through the water cut curve.Plugging off the high water cut zone can also slow down the bottom-water co-ning in heel of horizontal well and decrease the water cut of well head.

关 键 词：底水油藏 水平井 水淹 井筒压降方程 高渗透带 两相流 变质量流 

分 类 号：TE34[石油与天然气工程—油气田开发工程]