储层动态渗透率的分析与研究

Analysis and Research of Dynamic Permeability in Reservoirs

随着海洋油气田勘探程度的深入和区域的扩大,储层物性变化越来越大,对于测试程序提出了更高的要求,试井动态渗透率是制定测试程序的关键参数,其准确性关系到测试作业的质量和安全。目前测试设计的渗透率主要参考测井渗透率,存在一定的局限性,与实际数值相差较大。为了正确认识储层动态渗透率特性,使用多种方法对储层动态渗透率做了分析。建立电缆地层测试渗流数学模型,研究电缆地层测试渗流数学模型的求解方法,绘制电缆地层测试解释渗透率与钻杆测试(DST)解释动态渗透率关系图;根据不同储层早期测井和测试资料,建立测井渗透率与试井动态渗透率关系图版;利用电缆地层测试解释方法和测井解释方法预测试井动态渗透率对于测试井施工方案作出早期评价;利用声波无线遥测技术实时监测试井动态渗透率,实时了解测试全过程井下流动状态和压力探测距离,为地质和工程决策提供技术支持。

With the deepening of offshore oil and gas exploration and regional expansion,more and more changes in oil and gas reservoir physical properties are induced and higher requirements are proposed for well testing program,the dynamic permeability of well testing is a key parameter in developing test program,and its accuracy is related to the quality and safety of test operation.At present,the permeability of test design mainly refers to logging permeability,which has some limitations and is quite different from the actual value.In order to correctly understand the dynamic permeability characteristics of reservoir,the dynamic permeability of reservoir is analyzed by many methods.The permeation mathematical model is established and the solution method for the mathematical model is studied,the relation diagram is plotted for wireline formation testing for permeability interpretation and DST testing for dynamic permeability interpretation.The method of wireline formation testing and interpretation and the method logging interpretation for predicting the dynamic permeability of well testing are used early evaluation of well testing scheme.Acoustic wireless telemetry technology is used for monitoring the dynamic permeability of well test,the whole process of downhole flow state and pressure investigation distance are obtained in real time,it provides technical support for geological and engineering decision-making.