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建立了非均质气藏水平井三维渗流产能预测的数学模型,采用有限元方法对其进行求解,求解时将地质模型区块中不同空间位置处的渗透率值以及其它气藏物性参数分别布置到有限元模型的相应位置处的网格中,从而体现了三维空间中气藏的非均质特性.分析了非均质性对气藏水平井产能的影响.结果表明,气藏的非均质性对水平井的产气量影响很大,在相同的生产压差下,存在高渗透带的气藏水平井产量明显高于均质气藏水平井的产量;高渗透带条数越多、渗透率越大,导致气藏内压力消耗越小,水平井产量越高.最后,结合松辽盆地徐深层气田的地质特点和储层特性,给出了该气田的水平井产能预测实例.研究方法符合气藏的实际情况,为气藏水平井,特别是非均质气藏水平井的产能预测提供了一种行之有效的方法.
The mathematic model of three-dimensional seepage productivity prediction of horizontal wells in heterogeneous gas reservoirs is established. The finite element method is used to solve the problem. When solving, the permeability values at different spatial locations and the physical property parameters of other gas reservoirs are arranged To the grid at the corresponding position of the finite element model so as to reflect the heterogeneity of gas reservoirs in the three-dimensional space.The heterogeneity is analyzed on the productivity of horizontal wells in gas reservoirs.The results show that the non-homogeneous The quality has a great influence on the gas production of horizontal wells. Under the same production pressure difference, the production of horizontal wells with high permeability gas reservoirs is obviously higher than that of horizontal wells in homogeneous gas reservoirs. The more the number of high permeability zones, The larger the permeability, the smaller the pressure loss in the reservoir and the higher the horizontal well production.Finally, combining with the geological characteristics and reservoir characteristics of Xu deep gas field in Songliao Basin, an example of horizontal well productivity prediction is given. The method is in line with the actual situation of gas reservoirs and provides an effective method for productivity prediction of horizontal wells in gas reservoirs, especially in heterogeneous gas reservoirs.