断层板状油藏斜井试井模型研究

Research on Inclined Well Test Model for Slabby Fault Reservoir

Ozkan等人利用点源法在拉氏空间中建立了顶底封闭无限大均质地层中斜井的渗流模型,并用拉式数值反演计算出了斜井的井底压力响应。随着定向井技术日益成熟,采用斜井对断块油藏进行开发越来越普遍,但目前缺乏相应的试井理论图版,给断层油藏的试井工作带来了困难。利用杜哈美叠加原理、镜像反映原理和Stehfest反演算法,建立并求解了顶底封闭板状断层油藏斜井试井模型,考虑了井储和表皮对斜井无因次压力和压力导数曲线的影响,分析讨论了该类油藏斜井渗流特征及影响因素,为断层油藏中的斜井试井解释提供一定的理论基础。

Ozkan,et al.,used point source method to establish seepage flow model for inclined shaft in top and bottom closed infinite homogeneous formation in Laplace space and bottom hole pressure response of inclined shaft is obtained by Laplace numerical inversion calculation. Along with gradual maturity of directional well technologies,fault block oil reservoir development through inclined shaft method is more and more common. However,there is lack of corresponding well test theoretical charts at present,which brings about difficulties for well test in fault reservoir. Applied are Duhamel superposition principle,mirror image principle and Stehfest inversion algorithm to establish inclined well test model for top and bottom closed tabular fault reservoir and solve it,considered are effects of well reservoir and cuticular layer on dimensionless pressure and pressure derivative curve of inclined shaft,analyzed are seepage characteristics and influence factors of such reservoir inclined well,which can provide a theoretical basis for inclined well test interpretation in the fault reservoir.