摘要
水平井开发底水油藏过程中,随着原油的采出,井筒附近形成压降漏斗,底水突破油水界面向井底产生锥进,使油井见水时间、产量等发生变化,影响油藏开发效果。为详细刻画水平井生产变化,对其含水上升规律的研究是关键。基于底水油藏水平井渗流机理分析,利用南海西部油田实际油藏资料,优选了适合南海西部底水油藏的水驱特征曲线,并通过建立的底水油藏数值模型,求得俞氏水驱常数与影响油藏含水上升规律各因素的关系。在此基础上,以俞氏水驱常数为研究对象,结合正交试验设计方法,分析得到影响底水油藏水平井含水上升规律的主控因素。最后使用多元线性回归得到反映含水上升的定量关系式并通过实例验证。该研究思路可为类似底水油藏水平井含水上升规律影响因素的定性及定量研究提供一定的借鉴。
During horizontal well development of bottom water reservoirs,as crude oil is produced,a pressure drop funnel will be formed near the wellbore,and the bottom water will break through the oil-water interface to produce a coning at the bottom of the well,which will change the water breakthrough time and production of the oil well,thereby affecting the reservoir development effect.In order to describe the production changes of horizontal wells in detail,study on the law of water cut rise is a key.Based on the analysis of the seepage mechanism of horizontal wells in bottom water reservoirs,using actual reservoir data in the western oilfields of South China Sea,a waterflooding characteristic curve is optimized,which is suitable for bottom water reservoirs,and the bottom water reservoir numerical model is established to find the relationship between the Yu's waterflooding constant and the factors affecting the law of water-cutrising.On this basis,regarding the Yu's waterflooding constant as the research object,and combined with the orthogonal array design method,the main controlling factors affecting the law of water-cut rising in the horizontal well are analyzed.Finally,the quantitative relationship reflecting the rise in water cut is obtained by multiple linear regression method and verified by an example.This research idea can provide a certain reference for the qualitative and quantitative research on the influencing factors of water-cut rising in horizontal wells in similar bottom water reservoirs.
作者
张芨强
雷昊
于成超
张连枝
唐慧敏
ZHANG Jiqiang;LEI Hao;YU Chengchao;ZHANG Lianzhi;TANG Huimin(Zhanjiang Branch of CNOOC(China)Co.Ltd.,Zhanjiang 524057,China)
出处
《复杂油气藏》
2020年第4期51-56,共6页
Complex Hydrocarbon Reservoirs
基金
“南海西部油田上产2000万方关键技术研究”—课题《南海西部在生产油气田提高采收率技术研究》(编号:CNOOCKJ 135 ZDXM 38 ZJ 01 ZJ)。
关键词
底水油藏
含水上升规律
主控因素
正交设计
定量评价
bottom water reservoirs
water cut law
main controlling factor
orthogonal design
quantitative evaluation
