注蒸汽吞吐井焖井恢复试井分析方法及应用

Analysis method of build up well testing during shut in steam soak well and its application

利用焖井恢复试井资料，计算蒸汽浸渍半径及受热油层流变参数的数学模型，是一种较新的技术。在焖井恢复压力资料的处理中，建立了“平衡时刻点”这一新观点，明确了“平衡时刻点”之前的压降恢复曲线，是焖井恢复试井分析过程中唯一可应用的部分；借鉴拉塞尔的续流分析方法，将焖井恢复压力曲线线性化并计算出流变参数；应用求得的压力恢复曲线斜率，推导出孔隙介质径向流动微分方程的解析解，进而计算蒸汽浸渍半径，解决了稠油热采中蒸汽激励采油的实际问题。

The numerical model used to calculate steam impregnation radius and rheological parameter of heated oil bearing formation through the data of build up well testing during shut in is a new technique.The concept of “equilibrium moment” is developed during processing of pressure build up data of shut in well,and known that build up curve before equilibrium moment is the only applicable part during analysis process of build up well testing during shut in well.Using Lasels analysis method of afterflow for reference,pressure build up curve of shut in well is linearized and rheological parameter is calculated.According to the calculated slope of pressure build up curve,the analytic solution of differential equation of radial movement of pore medium is derived,and then the steam impregnation radius is calculated.The practical problem of steam stimulation during thermal recovery of heavy oil is solved.