利用动态数据判别有机堵塞井变化规律

Evaluating the change of organic plugging well using dynamic data

基于相关文献研究成果,对室内岩心实验所得的3种有机堵塞模式的渗透率损坏公式做了进一步推导及延伸,提出了利用动态数据判别是否发生有机堵塞的方法,并通过循环迭代求解分别得到了定压和定液生产条件下3种模式对应的产量和压差变化趋势:定液生产时,生产压差遵循凸函数或线性规律;定压生产时,产液量遵循凸函数或凹函数规律;地层能量不足和有机堵塞在拟合曲线上呈现出明显不同的趋势。选取埕北油田3口井进行了实例应用,结果表明,利用本文方法可以有效识别有机堵塞的发生。

According to the relevant research, the permeability damage formulas of 3 different plugging modes based on core plugging experiments are further deduced and extended, and a method using dynamic data to evaluate whether the well organic plugging happens or not is put forward. The change trends of production and pressure under constant production pressure difference and constant liquid production rate conditions are solved with cyclic iterations for 3 different organic plugging modes. Under constant liquid production rate condition, production pressure difference abides by the law of a convex or linear function. Under constant production pressure difference condition, the change trend of liquid yield abides by the law of a convex or concave function. The dynamic data influenced by formation energy deficiency shows a different trend on the matching curve from that influenced by organic plugging. The applications on 3 wells in Chengbei oilfield show that the method can effectively identify the occurrence of organic plugging.