致密气藏水平井速度管下入时间确定方法

Method to determine time of installing velocity string for horizontal well in tight gas reservoirs

吴武超¹ 李治平¹ 赖枫鹏¹ 任广磊² 赵钊¹

中国地质大学（北京）非常规天然气能源地质评价与开发工程北京市重点实验室，能源学院，北京 100083 中国石化华北分公司勘探开发研究院，河南 郑州 450006

Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering, School of Energy Resources, China University of Geosciences, Beijing 100083, China Research Institute of Exploration and Development, Huabei Company, SINOPEC, Zhengzhou 450006, China

致密气藏水平井具有低产、低压、井底容易积液等特点，从而易造成气井水淹。为了解决积液问题，目前一般采取在水平井中安装速度管的措施。根据致密气藏水平井的特点，从水平井积液的角度研究了速度管下入时间的确定方法。结合现场实践认为，水平井的造斜段最易积液，提出了根据生产动态数据和造斜段井筒携液模型耦合计算速度管下入时间的方法；并以华北DND致密气藏为例，进行了33口井的计算和实施。生产效果评价结果表明，33口井中有21口井生产效果好。根据21口井实例分析，19口井的计算结果能够保证更好的生产效果。

Horizontal well in tight gas reservoirs has low yield, low pressure, easily water accumulation, which can causes flooding and other issues. In order to solve water accumulation, velocity string in horizontal well is installed. According to the characteristics of horizontal well in tight gas reservoirs, time of installing velocity string in horizontal well has been studied. Water accumulation mostly happens in the curve section, this method is built on the dynamic production data and the liquid carrying model for curve section. In application, 33 wells in North DND tight gas reservoirs were calculated and implemented, the evaluation results show that the 21 wells are effective in the studied 33 wells. Analyzing the 21 wells, the calculations of 19 wells ensure better production.

10.6056/dkyqt201504026