全隱式化學(xué)驅(qū)油藏教值模擬研究
[Abstract]:The old oil fields in China are generally in the stage of high water cut development, and the average water cut has reached 90%. Chemical flooding technology is an important measure to tap the potential of oil fields and ensure stable production. At present, chemical flooding in the main domestic oil fields has entered a large-scale industrial application stage. The flow mechanism of chemical flooding reservoir is very complex, accompanied by a variety of physical changes and chemical reactions. At present, understanding the main physical and chemical mechanism of chemical flooding, correctly understanding the development law of chemical flooding reservoir, and effectively improving reservoir recovery are the key problems in the field of petroleum development. Researchers at home and abroad mainly study the main factors that affect the development effect of chemical flooding by means of indoor mechanism experiment, numerical simulation and field test, master the law of chemical flooding development, and guide the field implementation of chemical flooding. Among them, the numerical simulation of chemical flooding is not only the link between laboratory mechanism experiment and field test, but also an important tool for feasibility evaluation, scheme optimization and development effect prediction of chemical flooding project, so it has been paid more and more attention in the field of chemical flooding research. In this paper, the numerical simulation method of chemical flooding reservoir is studied, and the mathematical model and calculation method of chemical flooding are studied and improved, and the actual situation that the field pressure test data of chemical flooding is lack of reliable analysis means is studied and improved. The numerical well test research of chemical displacement is carried out, and a new well test model and parameter interpretation method are put forward, which improves the reliability of cluster-table binary displacement well test interpretation and the utilization rate of field pressure test data, and accurately evaluates the reservoir properties. It is of great significance to master the development dynamics. The main work and innovations of the paper are as follows: 1. On the basis of considering the main flooding mechanism and physicochemical phenomena of chemical flooding and reasonably simplifying the mathematical model of multiphase and multicomponent chemical flooding is established. Based on PEBI grid, a fully implicit numerical method is established by finite volume discretization. The numerical simulation software of chemical flooding is developed by using C language. The correctness of the software is verified by comparison with UTCHEM. 2. The variable substitution algorithm is applied to calculate the phase equilibrium of surface active agent. Different discrete linear equations are derived for various phase state changes, and saturation and component concentration are replaced in the solution, which improves the calculation speed without affecting the calculation accuracy. A new model of polymer flooding permeability decline is proposed. Based on the existing experimental results, the mechanism description of the effect of polymer concentration on the phase permeability curve is introduced into the numerical simulation of polymer flooding. This model overcomes the limitation of the existing DPR (disproportionate permeability reduction) model. Numerical experiments show that it is necessary to consider the influence mechanism of polymer concentration on the phase infiltration curve. On this basis, a method for evaluating the formation natural permeability damage caused by polymer in the process of polymer injection development by well test interpretation is proposed. 4. The self-developed numerical simulation software of chemical drive is applied to well test analysis. The transient pressure response characteristics of chemical flooding and the influence of related factors are studied by numerical well test method. The effect of non-Newtonian Rheological properties of polymer solution on transient pressure response was studied. It was found that shear thinning would lead to obvious jitter of early pressure derivative curve. Based on this, a method of obtaining polymer logistics denaturation in formation by well test analysis is proposed and verified by field test.
【學(xué)位授予單位】:中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:TE357.46
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