各向异性部分射开直井不稳定渗流理论研究

通过部分射开直井的不稳定渗流理论的研究,可确定垂向渗透率及其相关参数,为油藏动态分析及数值模拟提供可靠参数,因此各向异性部分射开直井的不稳定试井理论的研究具有重要实际意义,尤其对于各向异性底水油藏.但对于各向异性部分射开直井的不稳定渗流问题,国内外关于此问题的研究目前不是十分完善,在建立物理模型时射孔位置大多在油层顶部,不具有一般性,且只考虑上下边界封闭及上边界封闭-下边界定压两种边界条件,不够全面,为进一步完善各向异性油藏部分射开井的渗流理论,在总结文献研究成果的基础上,建立了部分射开直井渗流有代表性的物理模型及数学模型,运用Laplace变换、Fourier变换及Stehfest反演等数学手段进行求解,并对压力及压力导数曲线特征的影响因素进行敏感性分析,为各向异性油藏直井的不稳定试井提供了理论基础.

Unstable filtration theory study on straight well penetrating in various parts

By study on unstable filtration theory of parts of penetrating vertical wells, vertical permeability and relative parameters are determined and provides reliable data for reservoir dynamic analysis and numerical simulation. Thus, above study has an important and practical meaning, especially for various non - isotropic basal water reservoirs. However, for unstable filtration problems, study is not very comprehensive on home and abroad at present. Most of penetrating sites are located in top of oil layers when physical model is established, but not for all conditions, while only considering up and down border sealing and up border sealing-down border constant pressure without embodiment. Thus, in order to improve filtration theory for parts of various non - isotropic reservoirs parts of perforation wells and on the basis of literature study, representative physical and mathematic models are established, which use several mathematic methods including Laplace alteration, Fourier alteration and Stehfest inversion to compute and analyze influential factors on pressure and derivative curve features, so as to provide theoretical basement for unstable fihration of various non - isotropic reservoirs straight wells.