摘要
蛇曲井井身结构较为特殊,其近井地带渗流特征与产能评价的研究很有必要。采用水电模拟实验的方法,根据起伏程度、曲率半径、起伏周期的不同对蛇曲井产能进行了敏感性分析,并针对蛇曲井不同剖面的等压线分布做了分析比较,最后模拟了井筒附加压降存在时,蛇曲井纵剖面的压力分布变化。结果表明,蛇曲井存在最优起伏度,起伏周期不应过多;当井身曲率半径越小时,等压线分布越密集,反之越稀疏,等压线形状与井身轨迹密切相关;考虑井筒附加压降时,等压线分布出现较大变化。
Owing to its particular wellbore structure, it is essential to investigate the near-wellbore flow characteristics and produc- tivity evaluation of snaky wells. This paper analyzes the effect of different well-undulation indexes, curvature radiuses and undulation cycles on snaky wells productivity and makes a comparison of constant pressure line distribution in different near-wellbore profiles based on electrolytic analogue experiment. At last, a new approach was proposed to analyze the change of longitudinal profile pressure distribution caused by wellbore additional pressure drop existence. The results indicate that there is an optimal undulation index and fluctuation cycle; the smaller the curvature radius, the more dense the constant pressure line distribution, and vice versa. The shapes of constant pressure line are closely related to the well trajectory. The distribution of isobars changed significantly when the wellbore ad- ditional pressure drop is considered.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2013年第6期60-64,共5页
Oil Drilling & Production Technology
基金
国家科技重大专项"复杂结构井优化设计与控制关键技术"(编号:2011ZX05009-005)
关键词
电模拟实验
蛇曲井
产能
等压线
electrolytic analogue experiment
snaky well
productivity
constant pressure line
