稠油油藏蒸汽吞吐水平井生产动态分析

Production performance of cyclic steam stimulation horizontal well in heavy oil reservoirs

 孙逢瑞 姚约东 李相方 赵林 张逸 邹明

 （中国石油大学（北京）石油工程学院，北京 102249）

 (College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China)

 文中以稠油油藏为研究对象，针对水平井蒸汽吞吐产能计算问题，利用保角变换方法，得到蒸汽运移位置计算公式。再结合拟稳态产能公式及耦合流动矩阵，建立了完整的蒸汽吞吐水平井产能及生产动态参数分析模型，并结合累计产水量曲线对不同生产制度下蒸汽热利用率进行了分析。结果表明：定油量生产条件下，稳产期内井底流压先缓慢下降，后迅速下降；定油量较小时，生产时间延长，随着定油量增加，产能曲线趋近于定压产能曲线，稳产期缩短；生产制度不同，热利用率不同，定油量越大，周期产油量越高。该模型对现场蒸汽吞吐操作、合理选择生产制度、分析生产动态具有指导意义。

 Taking the heavy oil reservoir as the research object, the calculation formula of the steam migration position in cyclic steam stimulation(CSS) process is obtained by using the conformal transformation method. Combined with the quasi steady state productivity formula and the coupled flow matrix, a comprehensive mathematical model for predicting the CSS productivity of horizontal well and analyzing the dynamic parameters is established. And the heat efficiency under different production systems is analyzed by using the cumulative water production curve. The results show that the production period increases with the decrease of fixed oil rate; under constant oil production rate, the bottom hole flowing pressure at the stable stage decreases slowly at first, but then speeds up, and the stable production period shortens with the increase of the quantity of oil; with different production systems, heat utilization rate is different, the larger the amount of oil, the higher the cyclic oil production. This model has guiding significance for the reasonable production system, steam soaking operation and dynamic production analysis.

10.6056/dkyqt201701019