盐穴战略储油库注采运行方案的优化分析

Optimization for Injection-Production Operation Scheme for Strategic Petroleum Storage in Salt Cavern

为了研究储油库运行参数和溶腔蠕变对地下战略储油库稳定性的影响,并分析地下储油库战略储存的不同运行方案,由传热学和流体动力学理论,建立了溶腔内热质交换和溶腔蠕变模型。利用美国BH101盐岩战略储油库从1990年到1998年的实测数据对模型进行验证,模型预测的最大相对误差控制在15%之内,可较好地满足工程精度的要求。对拟建的金坛盐穴战略储油库的几种典型运行方案进行了分析,结果表明:适当减少原油注采周期之间的平衡稳定时间可以缓解溶腔蠕变,并能增加注采时间,有利于地下战略储油库溶腔的稳定;原油战略储存的开始阶段应使卤水井口与大气相通,待溶腔内油卤稳定之后再封闭卤水井有利于储油库的安全运行。

To investigate the effect of the operation parameters and rock cavity creep on the stability of the underground strategic petroleum storage, and analyze the different operation schemes of strategic storage, the mathematic model for heat and mass transfer in solution cavity and rock cavity creep is established based on heat transfer and fluid dynamics theory. The actually measured data of the USA BH101 strategic petroleum storage in salt cavern （1990-1998） are adopted to verify this model and the maximum relative error gets bellow 15 %, which meets the request of engineering precision. Then the typical operation schemes of the recommended Jintan strategic petroleum storage in salt cavern are discussed. It is suggested that appropriate shortening equilibration storage time after oil injected and produced into the reservoir slows creep contraction of cavity and extends the injection-production time , which is in favor of the stability of underground strategic petroleum storage; the brine wells ought to be connected with atmosphere during the initial stage of oil strategic storage, and they should be closed while the cavities become stable.