基于分形理論的聚合物驅(qū)試井分析
[Abstract]:Polymer flooding has made a great contribution to maintaining crude oil production in China. It was found that high viscosity and adsorption retention of polymer solution resulted in formation blockage, bottom hole pressure rising, injection volume decreasing, and microfractures in the formation around some wells. In recent years, pressure cracking plugging and injection increasing technology has been adopted in various oilfields to alleviate the problem of pressure rise and low injection rate of polymer solution. Therefore, it is important to study the influence of formation microfracture and artificial fracturing fracture on polymer solution injection ability. On the basis of investigating the percolation mechanism of polymer flooding at home and abroad, an effective viscosity model of polymer solution considering viscoelasticity and mechanical degradation effect is established. It is found that the viscoelastic and mechanical degradation effects of polymer solution occur only in the near well zone, and the shear thinning rheology of polymer solution is maintained in a wide range. Using fractal theory to study the influence of microfracture on percolation of polymer solution, the unsteady flow model of polymer flooding two-zone composite, three-zone composite and double-media two-zone composite seepage flow model based on fractal theory is established. Based on the bilinear flow analysis method, an unsteady flow model of polymer flooding in the complex reservoir of effective diversion vertical fracture wells is established. The model is solved by Stehfest numerical inversion method and finite difference method. The typical curve is drawn and the shape of the curve is analyzed. The evaluation indexes of polymer solution injection ability mainly include the injection index Hall curve and Hearn curve. These methods are similar to modern production dynamic analysis methods. The main purpose of this paper is to study the variation of polymer solution injection volume and pressure with time, and to obtain some physical parameters. Therefore, according to the unsteady flow model of polymer flooding and the introduction of material equilibrium time, four models of Agarwal-Gradnerian NPI and Transient injection ability were established, and the curve shape and parameter sensitivity were analyzed.
【學位授予單位】:中國石油大學(華東)
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TE357.46
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