渗透率应力敏感油藏试井解释模型研究

发布时间：2018-03-04 23:27

本文选题：应力敏感　切入点：试井分析　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：在对渗透率应力敏感油藏作压力动态分析时,一方面,假设各种岩性参数为常数会导致明显的错误,另一方面,与压力有关的各种岩性使描述井底压力的控制方程是非线性的,在使用摄动理论弱化此类控制方程的非线性时,许多学者为了方便方程的求解,一般取的是零阶摄动解,而对零阶摄动解能否满足解的正确性这一问题尚未有人研究。除此之外,对试井压力响应进行的多为压力降落试井研究,对关井恢复的压力及压力导数双对数曲线特征研究甚少。综上所述,本文主要研究内容如下:(1)建立并求解了考虑井筒储集效应、表皮效应及应力敏感效应的均质油藏试井解释数学模型,matlab编程得到了无限大、圆形封闭边界和圆形定压边界条件下的无因次井底压力及压力导数曲线,分析了典型曲线特征和影响试井曲线的因素,最后将saphir得到的数值解与零阶摄动解进行对比。(2)建立并求解了考虑井筒储集效应、表皮效应及应力敏感效应的双重介质油藏试井解释数学模型,matlab编程得到了三种边界条件下的井底压力动态响应,对典型曲线特征和影响试井曲线的因素如储容比和窜流系数等进行了深入讨论,最后将saphir得到的数值解与零阶摄动解进行对比。(3)建立并求解了考虑井筒储集效应、表皮效应及应力敏感效应的复合油藏试井解释数学模型,matlab编程计算了井底压力动态响应,对典型曲线阶段性特征和影响试井曲线的因素进行了详细讨论,最后将saphir得到的数值解与零阶摄动解进行对比。(4)对建立的三类数学模型进行了压力恢复分析,绘制了压力恢复试井曲线。通过对以上试井解释数学模型进行研究,能够对不同情况下的试井曲线有更加清晰的认识,为实际生产资料的试井解释工作提供理论指导。
[Abstract]:In the pressure performance analysis of permeability stress-sensitive reservoirs, on the one hand, assuming that various lithologic parameters are constant will lead to obvious errors. On the other hand, various lithologic properties related to pressure make the governing equations describing bottom hole pressure nonlinear. When using perturbation theory to weaken the nonlinearity of this kind of governing equation, many scholars generally take the zero-order perturbation solution to facilitate the solution of the equation. However, the problem of whether the zero-order perturbation solution can satisfy the correctness of the solution has not been studied. In addition, the pressure response of well test is mostly the research of pressure landing well test. There are few studies on the characteristics of double logarithmic curves of shut-in recovery pressure and pressure derivatives. In summary, the main contents of this paper are as follows: (1) the wellbore reservoir effect is established and solved. The mathematical model of well test interpretation for homogeneous reservoir with skin effect and stress sensitivity effect is programmed in MATLAB to obtain dimensionless bottomhole pressure and pressure derivative curves under infinite, circular closed boundary and circular constant pressure boundary conditions. The characteristics of typical curves and the factors affecting well test curves are analyzed. Finally, the numerical solution obtained by saphir is compared with the zero order perturbation solution. The mathematical model of well test interpretation for dual medium reservoir with skin effect and stress sensitivity effect is programmed in MATLAB to obtain the bottom hole pressure dynamic response under three boundary conditions. The characteristics of typical curves and the factors affecting well test curves, such as reservoir volume ratio and channeling coefficient, are discussed in depth. Finally, the numerical solution obtained by saphir is compared with the zero order perturbation solution. The mathematical model of well test interpretation for complex reservoirs with skin effect and stress sensitivity effect is programmed by MATLAB to calculate the dynamic response of bottom hole pressure. The stage characteristics of typical curves and the factors affecting well test curves are discussed in detail. Finally, the numerical solution obtained by saphir is compared with the zero order perturbation solution. (4) the three kinds of mathematical models are analyzed and the curves of pressure recovery well test are plotted. The above mathematical model of well test interpretation is studied. It can have a clearer understanding of well test curves under different conditions and provide theoretical guidance for well test interpretation of actual production materials.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE353

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