凝析气藏不同开发阶段储集层油气分布特征

发布时间：2018-03-05 21:06

本文选题：凝析气藏　切入点：开发阶段　出处：《新疆石油地质》2017年04期 　论文类型：期刊论文

【摘要】：复杂的相态变化特点决定了凝析气藏渗流研究比常规气藏具有更大的难度和特殊性。已有凝析气藏油气分布模型均以稳态法或非稳态法测得的相对渗透率为基础,因未考虑凝析液堵塞作用,从而高估凝析油渗流能力,导致结论与现场实际生产情况存在一定偏差,不能准确描述储集层内油气分布规律和正确评估气井产能。目前基于储集层微观非均质性的凝析气藏不同生产阶段油气分布规律的研究较少,缺乏制定气井全周期生产制度的必要理论依据。鉴于此,引入能反映凝析气藏内流体渗流能力的拟稳态相对渗透率测量方法,根据气藏微观孔隙尺度及毛细管压力分布,结合气井不同生产阶段油气渗流特征,形成一套开发全过程油气分布特征描述方法。并将该方法应用于凝析气藏生产参数优化设计,认为凝析气藏开采后期采用大压差生产时,应重点考察拟稳态相对渗透率对油气采出动态的影响,最后通过实际凝析气井的生产动态验证了提出的观点。
[Abstract]:Because of the complex phase change characteristics, it is more difficult and special to study the percolation of condensate gas reservoir than that of conventional gas reservoir. The existing gas and gas distribution models of condensate gas reservoir are based on the relative permeability measured by steady or unsteady state method. Because the clogging effect of condensate was not considered, the seepage ability of condensate oil was overestimated, which resulted in a certain deviation between the conclusion and the actual production situation on the spot. The distribution law of oil and gas in reservoir can not be accurately described and the gas well productivity can be correctly evaluated. At present, there are few researches on the distribution of oil and gas in different production stages of condensate gas reservoir based on microscopic heterogeneity of reservoir. In view of this, a pseudo-steady state relative permeability measurement method, which can reflect the fluid percolation ability in the condensate gas reservoir, is introduced according to the pore size of the gas reservoir and the capillary pressure distribution. According to the characteristics of oil and gas percolation in different production stages of gas wells, a set of description method of oil and gas distribution characteristics during the whole development process is formed. The method is applied to the optimization design of condensate gas reservoir production parameters. It is considered that the condensate gas reservoir is produced with large pressure difference in the later stage of production. The effect of pseudo-steady state relative permeability on oil and gas recovery performance should be investigated emphatically. Finally, the viewpoint put forward is verified by the production performance of actual condensate gas wells.
【作者单位】：中国石油大学石油工程教育部重点实验室;中国石油塔里木油田分公司塔西南勘探开发公司;
【基金】：国家973项目(ZX20150414) 国家油气重大专项(ZX20160212)
【分类号】：TE372

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