小井间距双井溶腔长期稳定性研究

Research on Long-Term Stability of Cavern with Slim Spacing Double-Well Solution Mining Technology

小井间距双井水溶造腔技术是一种较为新颖的盐穴储气库建造方法,其溶腔形状与单井有较大区别。基于数值分析的方法,对小井间距双井水溶造腔技术下的溶腔长期稳定性进行研究。研究结果表明:运行30 a后的腔体体积收缩率、腔顶沉降量以及塑性区体积都在安全范围之内,小井间距双井溶腔可用作地下储气库。在内压周期性变化条件下,相同时间内其周期数量越多,则腔体低压连续运行的时间越短,腔体的体积收缩率、腔顶的沉降量越小。

Double-well solution mining with small interwell distance is a new salt cavern construction technology,and the shape of the cavity is different from that of the single well.Based on numerical analysis method,the long-term stability of cavern constructed by double-well solution mining with small interwell distance was studied in this paper.The results show that：the shrinking percentage of cavern volume,settlement of roof and plastic zone were within safety limits after 30 years of operation,so the salt cavern managed by the new solution mining technology was applicable for underground gas storage.Under the condition that the internal pressure of cavern was periodically changeable,the more number of cycles at the same time,the shorter of continuous running time at low pressure,the smaller of shrinking percentage of cavern volume and settlement of roof.