浅薄层特超稠油开发后期蒸汽驱注采参数优化

Optimization of Steam Flooding Injection Production Parameters in Late Stage of Shallow Thin Layer Super Heavy Oil Development

浅薄层特超稠油具有埋藏浅、厚度薄、黏度大、分布散的特点,属于低品位稠油,开采十分困难。特别是到开发后期,由于气窜和地下剩余油分散,导致含水率急剧上升、产油量快速下降。但此时的采收率并不高,地下仍有大量剩余油资源。以河南油田为例,通过对矿场蒸汽驱实验效果的分析,利用数值模拟技术,对注采参数进行了优化:转驱的最佳时机是第9周期后;采用间歇汽驱效果相对较好;当周期注汽速度为120 m^3/d,注汽量为16 144 m^3,间歇时间为50 d时,开发效果最好。

Shallow thin layer super heavy oil has the characteristics of shallow burial,thin thickness,high viscosity and dispersion distribution.It belongs to low grade heavy oil and it＇s very difficult in developing.Especially in the late stage of development,the gas channeling and remaining oil underground dispersion lead the moisture content to rise sharply and the oil production to decline rapidly.Though the recovery rate is not high at this time,there is still a large amount of remaining oil resource underground.This paper takes Henan Oilfield as an example,through analyzing the experiment effect of field steam flooding,the injection production parameters are optimized with the numerical simulation technology.The best time to convert flooding is after ninth cycles;the effect of intermittent steam flooding is better;when cyclic steam injection rate is 120 m^3/d,steam injection volume is 16 144 m^3 and interval time is 50 d,the development effect is the best.