考虑热损效应的实用热采试井方法

WELL TESTING METHOD DURING THERMAL RECOVERY WITH CONSIDERATION OF HEAT LOSS

在热采项目中用压力降试井来估算蒸汽波及体积是非常重要的，而地层中热损效应在压力降试井分析中又是不可忽略的。现发表的一种试井方法考虑了这种效应，但此方法在使用中有些不足之处，其中之一是，油藏的渗透率无法从试井数据中估测，而必须预先知道才能估算其它参数。为了提高准确性，本文提出了一种修正方法，即使用压力导数来划分不同的流动区域；用数值模拟软件模拟压力降试井；用原来的方法和修正方法，以及常规试井方法分析了试井数据。结果表明，修正方法实用性更强，功能更全，除了具有常规方法的功能外，还能考虑热损效应。此外，修正方法还能判断热损效应是否严重地影响压力降试井方法的可用性。

During thermal recovery, to estimate swept volume with pressure fall off test is very important,while hest loss effect of the formation can not be ignored during analysis of pressure fall off test.A recently published well testing method has considered this kind of effect, but it has some shortcomings ,one is that we cant estimate reservoir permeability from well testing data,however,we must know it in advance as to estimate other parameters.This paper gives an amended method,that is to divide different flow areas with pressure derivative;to model pressure fall off test with numerical modelling software;and to analyze well testing data with original method,amended method,and conventional well testing method.The result shows that the amended method is more practical and its function is more complete.It considers hot loss effect except those conventional functions.In addition,this amended method can also be used to diagnosis whether the hot loss effect seriously affects the availability of pressure fall off test.