基于流动物质平衡的火山岩气藏产能分析方法

摘要

Volcanic gas reservoir is generally characterized by serious heterogeneity,great permeability difference,complicated distribution of gas and water,complex productivity distribution and big differences of well-controlled reserves by exploitation.Therefore,the well performance of volcanic gas reservoir is hard to analyze using the conventional gas reservoir decline analyses such as exponent,hyperbolic and harmonic decline methods.This paper presents single well performance analysis method for the volcanic gas reservoir based on flowing material balance.Furthermore,Blasingame curve is introduced to diagnose the gas flow characteristic section in such a well and enhance the reliability for parameter estimation.The reservoir permeability,wellbore skin factor and dynamic reserves can be obtained with the new well performance analysis method,which are of significance for the volcanic gas reservoir development.%火山岩气藏非均质性强、渗透性差异大、气水分布复杂,开采过程中表现出产能分布复杂、井控储量差异大等特征,因此,采用常规气藏递减分析方法（指数、双曲、调和）难以对气藏的动态进行分析。以火山岩气藏储集层特征为基础,采用单井为研究对象,提出基于流动物质平衡的火山岩气藏单井动态分析方法,并引入Blasingame分析曲线来识别气井的流动阶段特征段,提高参数估算的可靠性。用该方法得到气井的地层渗透率、地层损害表皮系数以及动态储量等关键参数,对指导气藏开发具有重要意义。