盐岩储气库注气排卤期剩余可排卤水分析

地下盐穴溶腔注气排卤过程中天然气和卤水共存,排卤管进入到卤水的深度及排卤速率决定了天然气是否会被卤水带出地表,如何调整后期排卤速率,降低排卤过程中带出天然气的风险,是注气排卤过程中的施工技术难题。针对该问题,采用流场分析理论对注气排卤后期盐岩储库腔底流场进行了模拟分析,得到排卤管外壁卤水向下流速;根据天然气气泡在卤水中的运移速率,分析确定了注气排卤后期不同剩余卤水深度下的安全排卤速率,为施工后期注气排卤速率调整提供了技术支撑。

Analysis of residual brine of salt rock gas storage during injecting gas to eject brine

In the natural gas storage engineering, the casing depth in the residual brine and the velocity of ejecting brine decide if the natural gas overflows from the salt cavern during injecting gas to eject brine. It is a difficult problem to adjust the velocity of ejecting brine under different casing depth in the residual brine and decrease the danger of the natural gas from the cavern. This technical problem is researched. The flow field of gas storage in the process of injecting gas to eject brine is modeled by the flowing theory of fluid. The maximal velocity of brine in the outside of casing is obtained. Based on the theory of the rising velocity of natural gas bubbles in the brine, the permitted velocities of ejecting brine under the different depths of residual brine are determined. The research result gives the technical support in the gas storage engineering of salt rock.