疏松砂岩油藏砾石充填防砂参数优化技术研究

一般地,疏松砂岩油藏成岩性差,泥质含量高,出砂严重,筛管砾石充填防砂是维持油田开发生产的主要工艺。地层出砂粒径发生变化后,生产过程中地层砂进入充填砾石层产生了互混,使油井产液量逐渐下降。在研究地层出砂粒径分布的基础上,在套管外地层亏空处充填砾石粒度中值突破传统的5—6倍地层砂粒度中值的常规做法,以实验为基础,选择了3—4倍地层砂粒度中值的充填砾石,可降低砂砾互混的概率。结合分级充填技术,在现场应用中取得了很好的效果。

Loose sandstone reservoir gravel packing sand control technology research on parameters optimization

In general, the loose sandstone reservoir has poor diagenesis, high shale content and serious sand production; screen gravel packing sand control is the main technology that maintained development and production in oilfield. In recent years, the diameter of the sand from formation has changed, the sand filling into the gravel and mixing with the gravel during the production, so that the production is gradually decreased. Based on the study of formation sand grain size distribution, the median particle size of filling gravel in the casing layer deficit breaks through traditional 5-6 times of median formation sand, based on experiments, selected the 3-4 times of median formation sand filling gravel, sand and gravel mixed probability can be reduced. Combining classification of filling technique, the application on site achieved good results.