试井法分析井间注采对应关系

发布时间：2018-05-27 08:10

本文选题：注采井 + 注采关系　；参考：《成都理工大学》2015年硕士论文

【摘要】：试井技术是油藏开发的一种重要手段,目前对于单井试井的方法和技术都比较成熟,但是对于认识多井井间影响存在着局限性。目前大部分油田的井网完善程度都很高,井间的相互影响问题越来越突出。因此研究井间的相互关系就显得尤为重要,为此本文进行了注采井间的渗流问题研究。本文通过详细调研前人的渗流理论及试井理论,发现目前的试井分析多是针对单井产量、压力、流线等的分析研究,而通过注采比、油水粘度比、渗透率及井距等参数对多井系统的注采井间问题研究较少。因此建立了无限大地层单一介质一注一采不稳定渗流模型、无限大地层双重介质一注一采不稳定渗流模型,运用拉氏变换的方法对所建立的模型进行求解,得到了模型的拉氏空间解。通过反演得到空间的近似解,应用叠加原理建立注采井间的压力关系式,以注水井为中心分析讨论在注采井分别提前工作的情况下,压力方程的简化问题尤其是幂积分函数项简化,并用简化的公式进行压力特征曲线图的绘制。分析提前工作时间、油水粘度比、注采比、弹性储容比、生产井含水率、地层渗透率、注采井距等因素对注采井井底压力特征影响。对注水井而言,提前注水时间越长,生产井开始生产后井底压力越大,注水井井底压力越大;提前注水时间一定,油水粘度比越大,注水井井底压力越大,生产井井底压力越小,即油相粘度大小影响驱使油流动的启动压力大小;生产井含水率越高,注水井井底压力越小,生产井井底压力越大,即含水率大小反映含油饱和度大小;产量一定,注采比越大,注水井井底压力越大;注入量一定,注采比越大,井底压力越大,即注采比大小反映油藏能量的亏空与补充的大小。井距越大,注水井井底压力越大,生产井井底压力越小;生产井提前生产时间越大,注水井和生产井井底压力越小;弹性储容比越大,注水井井底压力越小,生产井井底压力越小,即弹性储容比的大小反映裂缝的发育程度;注采井渗透率越大,注水井井底压力越小,生产井井底压力越大。通过对已完成的简化公式、单一因素分析的井底压力特征曲线分析,认为简化的近似解用于描述井间渗流的开始阶段还存在着局限性。对于确定压力波及到邻井的时间以及渗流早中晚期的特征,需要从精确解着手,进行进一步研究。
[Abstract]:Well testing technology is an important means of reservoir development. At present, the methods and techniques of single well testing are relatively mature, but there are some limitations in understanding the influence of multiple wells. At present, the perfection of well pattern is very high in most oilfields, and the problem of interaction between wells is more and more prominent. Therefore, it is very important to study the interwell relationship, so the seepage problem between injection and production wells is studied in this paper. By investigating the percolation theory and well testing theory of predecessors in detail, this paper finds that the current well test analysis is mostly aimed at single well production, pressure, streamline, etc., but through injection-production ratio, oil-water viscosity ratio, etc. There is little research on the cross-well problem of multi-well system such as permeability and well spacing. In this paper, the model of unstable percolation in infinite formation with one injection and one production is established, and the model of unstable percolation with one injection and one production in infinite formation is established. The model is solved by the method of Laplace transform. The Laplace space solution of the model is obtained. By inversion, the approximate solution of the space is obtained, and the pressure relation between injection-production wells is established by using the superposition principle. Taking the injection well as the center, the paper discusses the situation that the injection-production well is working ahead of schedule, respectively. The simplified problem of pressure equation, especially the simplification of the term of power integral function, is used to draw the characteristic curve of pressure. Factors such as working time ahead of time, oil / water viscosity ratio, injection-production ratio, elastic storage / capacity ratio, production well water cut, formation permeability, injection-production interval and other factors affecting bottom hole pressure characteristics of injection-production well are analyzed. For a water injection well, the longer the injection time is, the greater the bottom hole pressure is after the production well begins production, the greater the bottom hole pressure of the injection well is, and the greater the oil / water viscosity ratio is, the greater the bottom pressure of the water injection well is. The lower the bottom hole pressure of production well, that is, the viscosity of oil phase affects the starting pressure of oil flow, the higher the water cut of production well, the smaller the bottom pressure of water injection well, the greater the bottom pressure of production well, that is, the size of water cut reflects the oil saturation. The bigger the injection-production ratio is, the greater the bottom hole pressure is, and the larger the injection-production ratio is, the greater the bottom hole pressure is, that is, the size of injection-production ratio reflects the deficit and replenishment of reservoir energy. The greater the well spacing, the greater the bottom pressure of water injection wells, the smaller the bottom pressure of production wells, the greater the production time, the smaller the bottom pressure of water injection wells and production wells, the greater the ratio of elastic storage and capacity, the smaller the bottom pressure of water injection wells. The smaller the bottom hole pressure of production well is, the greater the ratio of elastic reservoir capacity is to the development degree of fracture, and the greater the permeability of injection-production well is, the smaller the bottom pressure of water injection well is, and the greater the bottom pressure of production well is. Through the analysis of the simplified formula and the characteristic curve of bottom hole pressure by single factor analysis, it is considered that the simplified approximate solution is still limited in the initial stage of describing the seepage flow between wells. In order to determine the time of pressure spreading to adjacent wells and the characteristics of percolation in early, middle and late stages, it is necessary to further study the exact solution.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE353

【参考文献】