气藏粒间水产出量预测方法研究

气藏的初期产水量很难用数模方法进行预测,因此编制气藏开发方案时一般仅用凝析水代替,或直接采用测试获得的产水量。这使得产水量预测结果与实际相差较大,特别是胶结疏松的砂岩气藏表现更为明显。为了解决这一矛盾,通过对比分析我国海上3个典型气田初期实际产水量与理论凝析水产量差别大的原因,提出了气藏初期产出水应包括凝析水和粒间水;采用统计方法分析了凝析水水气比、粒间水水气比和采出程度的关系,建立了预测不同开发时期凝析水水气比、粒间水水气比的方法。

A study on methods to predict intergranular water production in gas reservoirs

Early water production in a gas reservoir is difficult to predict in numerical simulation,and the condensation water production or water production directly tested are alternatively used to make development plans for gas reservoirs,leading to a greater difference between the predicted water production and the actual one,especially in unconsolidated sandstone gas reservoirs.In order to solve this problem,it is proposed that the early water production of a gas reservoir should include condensation water and intergranular water,by comparing and analyzing the reasons of great differences between actual early water production and theoretical condensation water production for three typical offshore gas fields.Furthermore,the correlation of water-gas ratio with reservoir depletion are analyzed for condensation water and intergranular water respectively by a statistical tool,and the methods to predict water-gas ratios of condensation water and intergranular water in different development stages are established.