盐穴储气库造腔过程夹层处理工艺——以西气东输金坛储气库为例

Interlayer treatment process in cavity building for salt cavern gas storage - A case study of Jintan Gas Storage of West-to-East Gas Pipeline

郭凯¹;  李建君²;  郑贤斌¹

1. 中国石油天然气股份有限公司天然气与管道分公司,北京100007;
2. 中国石油西气东输管道分公司,上海200122

GUO Kai¹;  LI Jianjun²;  ZHENG Xianbin¹

1. PetroChina Company Limited Natural Gas & Pipeline Company, Beijing, 100007;
2. PetroChina West-to-East Gas Pipeline Company, Shanghai, 200122

盐穴储气库; 夹层溶蚀; 油垫厚度; 油水界面

salt cavern gas storage; interlayer dissolution; oil cushion thickness; OWC

国内盐穴储气库造腔层段岩性复杂,不同深度存在不同厚度的夹层,夹层厚度从1 m 至 10 m以上,造腔结果相差较大。以金坛储气库8 口造腔井为例,通过造腔参数分析,研究不同夹层处理工艺下的造腔效果,总结出多夹层盐岩段造腔工艺技术方案:使油水界面在夹层上部且距离夹层至少3~4 m;当油水界面在夹层下部时,控制油垫厚度小于0.1 m 且腔顶直径不要太大;当前阶段油水界面位于夹层下部且腔体需要扩容时,将油水界面调整至夹层上部;当处理腔体下部夹层时,使内管位于夹层下部,至少在夹层位置。上述技术方案可为其他盐穴储气库建设提供参考和技术支持。

In China, the cavity building interval for salt cavern gas storage often features complicated lithology, and interlayers with varying thickness (from 1 m to 10 m or more) exist at different depths, leading to distinct results of cavity building result. Taking the 8 cavity building wells of Jintan Gas Storage as an example, through analyzing the cavity building parameters, and studying the cavity building effect under different interlayer treatment process, the cavity building solution for multi-interbedded salt rock is proposed: (1) the OWC is kept at least 3-4 m above the interlayer; (2) when the OWC is under the interlayer, the oil cushion thickness is controlled less than 0.1 m and cavern roof diameter should not be too big; (3) when the OWC is under the interlayer and the cavern needs to be expanded, the OWC is adjusted above the interlayer; and (4) when the interlayer beneath the cavern is treated, the inner pipe should be located under the interlayer or at least at the interlayer position. The solution can provide a reference and technical support for other salt cavern gas storage building.