山东省惠民县境内的阳5潜山气藏是构造裂缝、溶蚀孔洞较为发育和具有底水的CO2气藏。利用三次测试资料,分析了该气藏的试井特征,其是:1通过流动压力、流动温度梯度曲线与室内观察结果发现,流动纯CO2气柱与静止CO2气柱的相态特征存在着明显的差异,在高于CO2临界温度的情况下,井筒内就可能出现气、液两相形成的高密度流体(液态水、气态CO2及其水合物),在265.80m左右达到临界条件,可能开始有液态CO2生成,受其影响,井筒损失比较严重;2气井产能较低,气藏稳产条件较差;3两层合采显著降低了气井产能。最后从多方面论证了气井合理初期产能并提出了提高产能的主要措施:对地层采用酸化解堵措施以减小污染,采用小油管增加井筒内流速以提高气流的携液能力。

Buried hill Y5 gas reservoir with bottom water has a high CO₂ content of 92.88 %~99.80%, in which structural fractures and solution cavities are relatively dev eloped. On the basis of testing data of three times, this paper analyzes well te sting characteristics of the reservoir. 1) Through comparison between observatio n results of flowing pressure & temperature gradients and lab analysis, it could  be seen that phase behavior of flowing CO₂column has obvious difference w ith that of static one. Under the circumstances of above critical conditions of  CO₂, high-density fluid, including liquid water, gaseous CO₂ and hydrates,  has been appearing in the well bore. Liquid state CO₂ begins to be formed at t he depth of 265.80 m or so, when critical conditions are reached. Influenced by  those, pressure loss in well bore is severe comparatively. 2) Per-well gas rate  is relatively low and the base of stable production is obviously poor. And, 3)  Commingled production of two layers could remarkably reduce gas deliverability.  Finally, reasonable initial per-well gas rate are discussed from many aspects,  and major measures to increase gas rate are put forward, that is, reducing pollu tion through adoption of acidizing reservoir to dissolve blockage and improve ca pability of gas flow carrying liquid by introduction of slim tubing to  increase  velocity of flow in the well bore.