有水气藏动态分析方法及应用研究

发布时间：2018-01-19 22:51

本文关键词： 水驱气藏渗流模型水侵 Blasingame图版动态分析方法研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国现阶段开发的气藏中,大部分均为不同程度的水驱气藏,以四川盆地为例:现已探明的约500个气藏构造中,有水气藏占到近250个。水驱气藏随着开发的不断进行边底水持续侵入,一方面气水两相流会对生产造成不良影响,特别是在气井见水后,产量会急剧下降;另一方面以Arps曲线为基础的传统产量递减分析方法和以Blasingame曲线为基础的现代产量递减分析方法已经在油气田动态分析中得到了广泛应用,但这些方法均是基于封闭弹性驱理论,并不能很好的解决水驱气藏的动态分析问题。因此开展有水气藏的动态分析方法研究,对水驱气藏精细描述、储量预测、开发效果评价具有重要意义。本文从渗流力学理论出发,建立了一套适用于有水气藏动态分析的图版拟合法,得到以下结论与认识:(1)建立了用于水驱气藏动态分析基础研究的"斜坡型"水驱气藏渗流模型和"阶跃型"水驱气藏渗流模型。(2)通过对基本模型和边界流模型进行拉氏变换和求解,得到了有水气藏渗流模型的定压产量解与定产压力解。(3)将得到的"斜坡型"http://cdmd.cnki.com.cn/"阶跃型"水驱气藏模型与Fetkovich递减分析理论相结合,使用Stehfest数值反演算法编程绘制得到水驱气藏Fetkovich典型曲线。分析后发现水驱气藏的Fetkovich典型曲线存在四个流动阶段;曲线特征主要受井控半径,水侵稳定时间和水侵稳定流量的影响。(4)对水驱气藏物质平衡方程进行再研究,通过参数修正和类比的方法,得到了考虑水侵作用的水驱气藏修正生产指示曲线和水驱气藏物质平衡拟时间的表达式;进一步结合Blasingame递减分析理论得到了水驱气藏递减曲线图版,总结出一套适用于水驱气藏动态分析的Blasingame分析法。(5)实例分析,运用动态分析典型图版和水驱气藏物质平衡修正法对两口典型井进行了动态分析解释,与动态分析软件结果进行对比,证明了本方法的可靠性。结论认为:本文得到的图版曲线特征与实际生产情况更加吻合,典型图版拟合法不仅可评价单井控制储量、渗透率、控制半径等基础参数,还可以定量评价水驱气藏水侵时间、水侵强度、水体大小等参数,为边底水气藏的动态解释和高效开发提供了理论基础。
[Abstract]:Most of the gas reservoirs developed in China at the present stage are water-driven gas reservoirs of different degrees. Take Sichuan Basin as an example: about 500 gas reservoirs have been proved. Water reservoir accounts for nearly 250 gas reservoirs. Along with the continuous development of water flooding gas reservoir edge and bottom water continuous invasion, on the one hand, gas-water two-phase flow will have a negative impact on production, especially after the gas wells water, the production will decline sharply; On the other hand, traditional production decline analysis method based on Arps curve and modern production decline analysis method based on Blasingame curve have been widely used in oil and gas field performance analysis. Yes. However, these methods are based on the theory of closed elastic flooding and can not solve the problem of water drive gas reservoir performance analysis. Therefore, the research of water reservoir performance analysis method is carried out, the precise description of water drive gas reservoir and reserves prediction are carried out. The evaluation of development effect is of great significance. Based on the theory of percolation mechanics, a set of chart fitting methods suitable for dynamic analysis of water-bearing gas reservoirs has been established in this paper. The following conclusions and understandings are obtained: (1) the percolation model of "slope" water-drive gas reservoir and "step" water-drive gas reservoir percolation model are established for the basic research of water drive gas reservoir performance analysis. The basic model and boundary flow model are solved by Laplace transformation. The constant pressure production solution and constant production pressure solution of water reservoir percolation model are obtained. The model of "ramp type" http: r / cdmd.cnki.com.cnni.com.cnni.com.cnni.obtained is combined with the theory of Fetkovich decline analysis. Stehfest numerical inversion algorithm is used to draw the typical Fetkovich curve of water drive gas reservoir, and it is found that there are four flow orders in Fetkovich typical curve of water drive gas reservoir. Paragraph; The curve characteristics are mainly affected by well control radius, water invasion stabilization time and water invasion stable flow. (4) the mass balance equation of water drive gas reservoir is studied again, and the method of parameter modification and analogy is adopted. The modified production indicator curve of water-drive gas reservoir and the expression of material balance pseudo-time of water-drive gas reservoir considering water invasion are obtained. Combined with the theory of Blasingame decline analysis, the decline curve of water drive gas reservoir is obtained. A set of Blasingame analysis method, which is suitable for the performance analysis of water-drive gas reservoirs, is summarized. The dynamic analysis and interpretation of two typical wells are carried out by using the dynamic analysis typical chart and the material balance correction method of the water drive gas reservoir, and the results are compared with the results of the dynamic analysis software. The reliability of this method is proved. It is concluded that the characteristic of the chart curve obtained in this paper is more consistent with the actual production situation, and the typical chart fitting method can not only evaluate the controlled reserves and permeability of single well. The basic parameters such as control radius can also be used to quantitatively evaluate the water invasion time, water invasion intensity and water body size of water flooding gas reservoirs, which provides a theoretical basis for the dynamic interpretation and efficient development of the edge and bottom water reservoirs.
【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】：TE332

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