中石化地下储气库建库关键技术研究进展

随着天然气需求量的增加和天然气对外依存度的上升,为了保障安全、平稳、连续、可靠的天然气供应,我国加大了地下储气库(以下简称储气库)的建设力度及相关技术攻关。为此,梳理了中国石油化工集团有限公司(以下简称中石化)储气库建设现状,分析了面临的机遇与挑战,总结了中石化储气库建库关键技术的研究进展。研究结果表明:①中石化储气库建设起步较晚,但发展潜力大;②中石化建库地质条件复杂,相对较差,但库址资源靠近消费区;③初步形成了包括库址筛选与评价、储气库动态密封性评价、地质重构、有效库容评价、库容参数与建库方案优化设计、全生命周期完整性评价等一系列复杂地质条件气藏型储气库建库关键技术;④同时开展了含水圈闭资源筛选、含水圈闭改建储气库地质评价、有效气顶形成机理、关键库容参数优化等关键技术研究,探索了含水层储气库建库关键技术;⑤攻关了盐穴储气库腔体设计与稳定性评价、多夹层垮塌与腔体形态控制等关键技术,厚夹层盐穴储气库建库技术取得突破性进展。结论认为,一系列建库关键技术有力地支撑了中石化储气库的建设和发展,助推了中石化天然气业务的快速有效发展。

Research progress of Sinopec's key underground gas storageconstruction technologies

As the demand and external dependence of domestic natural gas increase, China strengthens the construction of underground gas storage (UGS) and the related technological researches in order to ensure a safe, smooth, continuous and reliable gas supply. This paper reviewed Sinopec's UGS construction status, analyzed the opportunities and challenges and summarized the research progress of Sinopec's key UGS construction technologies. And the following research results are obtained. First, Sinopec's UGS construction started late, but its development potential is huge. Second, Sinopec's UGS sites are close to the consumption areas, so the geological conditions are complicated and poor. Third, a series of key technologies for the construction of UGSs rebuilt from geologically complicated gas reservoirs are preliminarily developed, including site selection and evaluation, dynamic sealing capacity evaluation, geological reconstruction, effective storage capacity evaluation, optimal design of storage capacity parameter and construction scheme, and whole-life cycle integrity evaluation. Fourth, several key technologies are studied, such as the selection of water-bearing trap resource, geological evaluation of UGSs rebuilt from gas-bearing traps, the formation mechanism of effective gas caps and the optimization of key storage capacity parameters, and the key technologies for the construction of aquifer UGSs are also explored. Fifth, key technologies for salt cavern UGSs are researched, including cavity design and stability evaluation, multi-interlayer collapse, and cavity shape control. In addition, a breakthrough progress is made in the technologies for constructing salt cavern UGSs with thick interlayers. In conclusion, a series of key UGS construction technologies provide a powerful support for the construction and development of Sinopec's UGSs and promote a fast and effective development of Sinopec's natural gas business.