蛇曲井渗流特征与产能评价电模拟实验研究　　

Electrolytic analogue experiment study for flow mechanics characteristics and productivity evaluation of snaky wells

张睿 韩国庆 宁正福 廖新维

ZHANG Rui HAN Guoqing NING Zhengfu LIAO Xinwei

中国石油大学石油工程教育部重点实验室，北京　102249

MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China

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 productivity 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 additional pressure drop is considered.