含水层型地下储气库天然气动态运移规律

根据含水层型地下储气库储层高度与面积相比很小的特点，建立了含水层型地下储气库天然气动态运移的积分平均模型。利用该模型计算了国内某拟建含水层型地下储气库天然气动态运移过程中注气点含气饱和度和压力随时间的变化规律，对比了本文模型与传统二维渗流和三维渗流数学模型的计算精度，研究了天然气动态运移过程中储层厚度、储层渗透率、注气速率和排水量等参数对注气点压力的影响。结果表明：本文建立的积分平均模型具有较高的计算精度，可以满足工程计算要求;注气点压力随着储层厚度、渗透率和排水量的增加呈非线性降低，随着注气速率的增加呈非线性增加。

Natural gas dynamic migration in an underground gas storage in aquifer beds

In view of a very small ratio of reservoir thickness to area in an under ground gas storage in aquifer beds,an integral average model was proposed for the natural gas dynamic migration,based on which the injection point saturation and pressure during the natural gas dynamic migration for a planed underground gas storage were calculated.The calculation result was compared with those derived from traditional two-dimensional and three-dimensional seepage mathematical models in order to verify the precision of this proposed model.Influences of reservoir thickness,permeability,injection rate and drainage during the natural gas dynamic migration on the injection point pressure were studied.The study shows that the integral average model is of a high precision and can meet the actual engineering demands.The injection point pressure decreases nonlinearly with the increase of reservoir thickness,permeability,and drainage but increases nonlinearly with the injection rate increasing.