产量不稳定分析在塔中Ⅰ号气田动态评价中的应用

塔中Ⅰ号碳酸盐岩气田具有极强的非均质性,其储层参数及单井控制储量评价非常复杂。产量不稳定分析方法综合考虑流动压力和产量的关系,通过典型曲线法、流动物质平衡法、解析模型法等分析方法对单井生产动态进行诊断分析,并求取储层渗透率、表皮因子等相关参数及单井动态储量。文章以塔中Ⅰ号气田开发试验区为例,说明了该方法在碳酸盐岩凝析气藏动态评价中的具体应用。由结果可知,产量不稳定分析方法对单井生产动态具有一定的诊断作用,对单井生产动态与储层的关系有更加清楚的认识;该方法对储层参数评价准确,通过产量不稳定分析结果与不稳定试井解释结果对比发现,对未有不稳定测试资料的碳酸盐岩凝析气井来说,可直接采用产量不稳定分析法对储层进行评价。

Application of Production Instability Analysis to Performance Evaluation of Tazhong No.1 Gasfield

The carbonate Tazhong No.1 Gasfield has extremely strong heterogeneity, with very complex reservoir parameters and evaluation of reserves controlled by the individual wells. The inflow performance relationship (IPR) is comprehensively considered in the unstable production analysis. The individual well performance is analyzed through typical curve method, the flowing material balance method, and analytic model method. These are also used to obtain the reservoir permeability, the skin factor and other relevant parameters as well as the dynamic reserves per well. In this paper, taking the development pilot zone of Tazhong No.1 Gasfield as an example, the specific application of the method to the evaluation of condensate gas reservoir performance is illustrated. It can be inferred from the results that the unstable production analysis has a certain effect for individual well performance analysis, with more clear understanding of the relationship between the individual well performance and the reservoirs. The reservoir parameters evaluation is accurate with this method. It is found that, through comparison of results of the unstable production analysis with transient well test interpretation, we can directly adopt the unstable production analysis method to evaluate reservoirs for carbonate condensate gas wells.