摘要
临界产量的确定是利用水平井开发底水油藏的关键。在分析水平井开采过程中底水锥进机理的基础上,将水平井三维渗流场近似分解为内、外两个渗流场。分别分析两个渗流场的流线分布,利用Dupuit公式得到外部渗流场临界产量计算公式;利用平面径向流原理,将水平段长度视为"油层厚度",井眼与油层顶部距离视为"泄油半径"得到内部渗流场临界产量计算公式;结合等值渗流阻力原理得出底水油藏水平井临界产量计算新方法。据新方法进行实例分析,对比前人推导的不同方法的计算结果,分析各向异性、水平段长度以及水平段距油层顶界的垂向距离与油层厚度之比对临界产量的影响规律。
The key of using horizontal well to develop bottom water reservoir is to determine the critical production.Based on the analysis of water coning mechanism,the 3D percolation field of horizontal well is approximately divided into two parts including internal and external percolation fields.The two streamline distributions are analyzed.First,the Dupuit formula is used to get the formula of critical production for external field.Second,the horizontal length is taken as ＂reservoir thickness＂ and the distance between wellbore and reservoir top is taken as ＂drainage radius＂,and then the formula of critical production for internal field is given by using radial flow theory.Last,combining with the rule of equivalent filtrational resistance,a new method for calculation of the critical production of a horizontal well in bottom water reservoir is proposed.The case study is conducted and the comparisons among the different methods are presented.The effects of anisotropy,horizontal length and ratio of horizontal section＇s vertical distance and reservoir thickness on the critical production are analyzed.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2011年第1期60-62,共3页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2008ZX05-024-003-03)
国家自然科学基金项目(10902093)
关键词
底水油藏
水平井
底水锥进
临界产量
bottom water reservior
horizontal well
bottom water coning
critical production
