溶解气驱油藏油气多相试井分析方法研究

ANALYSIS OF MULTIPHASE WELL TEST FOR SOLUTION-GAS-DRIVE RESERVOIRS

根据溶解气驱油藏的渗流特征 ,指出该类油藏在高生产气油比情况下 ,沿用单相油井或单相气井的试井分析方法 ,进行解释均导致较大的方法误差 ,必须考虑油气多相流特性。应用物质平衡原理建立多相渗流数学模型 ,通过定义拟函数将多相渗流方程变换为单相流体渗流方程相似形式 ,从而为多相流试井分析提供实用方法 ;分析讨论了利用相对渗透率曲线的拟函数处理方法在实际应用中所面临的困难 ,提出利用现场生产数据计算相对渗透率和拟函数处理的新方法 ,该方法所需相关参数少、计算稳定 ;通过软件实现与现场资料分析表明 ,应用现场生产数据计算相对渗透率和计算拟函数的新方法 ,其解释结果可靠。

Applying material balance principles, a mathematical model of multiphase flow is built to supply a tool for well test analysis of solution?gas?drive reservoirs. In the model the multiphase flow problem is described by single?phase flow equations through setting pseudo functions. A new method of calculating relative permeability and pseudo functions with production data is proposed.With the method,minimal data is needed and the calculation results are consistent.Case applications indicate that the proposed method is valid and reliable.