优势渗流通道的试井解释方法研究

复杂断块油藏水驱开发极易形成优势渗流通道,造成油井很快见水。识别优势渗流通道主要手段是测井对比、岩心分析、压降测试等,目前的优势渗流通道识别试井解释模型无法适应现场需求。通过分析优势渗流通道基本形态,建立了优势渗流通道试井模型;通过有限差分法对模型进行离散求解,绘制了井底压力及压力导数双对数曲线试井解释图版。优势渗流通道试井响应主要有通道径向流和线性流两段,分析了通道渗透率、储容比、宽度等参数对优势渗流通道试井响应的影响,最后利用建立的双对数曲线图版对高尚堡油田一口井压降测试资料进行了解释,曲线吻合效果较好,该方法可以作为优势渗流通道试井识别方法进行推广应用。

Well testing interpretation method research of preferential seepage channels

As for water drive development in complex fault block oil reservoir,it is easy to form preferential seepage channels and result in water breakthrough in oil wells.The main means of identifying the preferential seepage channels are logging comparison,core analysis,pressure drop testing,and etc.,however,the well testing interpretation model for the preferential seepage channels identification cannot meet the present demands.Through the base form analysis of the preferential seepage channels,the well testing models for preferential seepage channels have been established.By finite difference method,the discrete solution of the models has been carried out and the bottom hole pressure and pressure derivative double logarithm curve of well test interpretation chart has been drawn.The well testing response of preferential seepage channels mainly has two flows,the radial flow and linear flow.Besides,the influence of channel permeability,the storage ratio and the width on the well testing response of preferential seepage channels has been analyzed.In the end by use of the double logarithm curve chart,the interpretation of pressure drop test data has been made and the curve fit effect is good.Therefore,this method can be used as identification method for preferential seepage channels and put into wide application.