【摘要】：納微米聚合物顆粒分散體系能夠深入地層起到調(diào)驅(qū)作用,有效的改善低滲透油田注水開發(fā)效果并提高采收率。納微米聚合物顆粒分散體系在多孔介質(zhì)中運移規(guī)律復雜,實驗中發(fā)現(xiàn)顆粒團聚、微觀結(jié)構(gòu)變化及選擇性進入孔喉等非勻相滲流現(xiàn)象,但對非勻相滲流機理及其對提高采收率的影響仍未有系統(tǒng)研究,因此如何科學的描述納微米聚合物顆粒分散體系的復雜滲流規(guī)律及提高采收率機理就成為納微米聚合物顆粒調(diào)驅(qū)技術推廣應用的關鍵問題。 隙被驅(qū)替相填滿,最先被填滿的孔隙所需要的時間就是／甲基丙烯酸甲酯(AA/AM/MMA)顆粒,對其非勻相滲流特征及其提高采收率機理開展了一系列實驗和理論研究： 1.基于水化膨脹實驗和流變實驗,建立綜合考慮顆粒膨脹動態(tài)變化和膨脹聚合物顆粒間作用力的分散體系流變模型,分析了地層環(huán)境、剪切速率和水化時間對聚合物顆粒水化膨脹程度及分散體系流變的影響。 2.通過微觀仿真可視化實驗研究發(fā)現(xiàn),納微米聚合物顆粒在多孔介質(zhì)內(nèi)運移和滯留過程中有兩種非勻相滲流現(xiàn)象：顆粒徑向濃度分布雙層微觀結(jié)構(gòu),不同流動阻力孔喉中顆粒非勻相濃度分布。建立微圓管內(nèi)聚合物顆粒體積濃度徑向非勻相分布數(shù)學模型,分析顆粒膨脹程度、剪切模量、溶劑粘度和剪切速率等因素對顆粒分布及分散體系流動規(guī)律的影響。引入紅細胞局部非勻相分布模型并修正,量化分析聚合物顆粒在孔喉中非勻相分布時濃度變化規(guī)律。建立了納微米聚合物顆粒三維毛管束網(wǎng)絡中運移模型,模擬發(fā)現(xiàn)聚合物顆粒集中在主流線通道中,調(diào)整了流場分布,使得孔喉中流動阻力達到平衡狀態(tài)。 3.基于兩相相對滲透率實驗,建立納微米聚合物體系驅(qū)油平行毛管束模型,考慮了聚合物顆粒非勻相濃度分布,模擬分析了分散體系驅(qū)油過程中兩相相對滲透率變化規(guī)律。注入分散體系后油相相滲曲線和等滲點右移,水相相滲曲線末端出現(xiàn)下凹形態(tài),即在高含水飽和度時水相相滲下降。研究發(fā)現(xiàn)考慮聚合物顆粒非勻相濃度分布時,中高滲透率通道隨著分散體系的持續(xù)注入逐步被封堵。 4.基于納微米聚合物顆粒封堵實驗,建立分散體系的阻力系數(shù)和殘余阻力系數(shù)關系表達式。結(jié)合聚合物顆粒非勻相濃度分布模型,建立了考慮注入速度、顆粒粒徑和顆粒濃度等因素的擬相對滲透率計算模型。水相相滲隨著顆粒濃度、注入速度和顆粒粒徑的增加而下降。 5.建立納微米聚合物顆粒分散體系驅(qū)油二維網(wǎng)絡模型模擬方法,模擬了注入聚合物顆粒后剩余油分布和不同類型剩余油比例,揭示了聚合物顆粒特性對提高采收率的影響。 6.建立非均質(zhì)分層地層納微米聚合物顆粒分散體系調(diào)驅(qū)數(shù)學模型,考慮聚合物顆粒的非勻相分布,模擬注聚合物顆粒提高非均質(zhì)地層采收率的變化規(guī)律。闡明了顆粒濃度、注入量和轉(zhuǎn)注時機等因素對影響,揭示了非勻相顆粒濃度分布有利于擴大波及體積。 本文通過實驗研究、理論分析和數(shù)值計算,主要得到了以下認識：顆粒水化膨脹特性是分散體系粘度和非勻相流動的重要影響因素,顆粒膨脹程度越大,固壁邊界潤滑層厚度越大,顆�？臻g非勻相分布現(xiàn)象越顯著。顆粒分布雙層微觀結(jié)構(gòu)使分散體系表觀粘度剪切變稀,而顆粒濃度多孔介質(zhì)內(nèi)非勻相分布能逐步封堵低流動阻力孔喉,使水相滲透率在高含水飽和度時下降。研究揭示了納微米聚合物顆粒濃度非勻相分布有利于擴大波及體積,提高低滲層采出程度,為深入分析納微米聚合物顆粒分散體系驅(qū)油機理提供了理論支持。
[Abstract]:The nano-micron polymer particle dispersion system can be used for deep formation to play a role of regulating and driving, effectively improving the water injection development effect of the low-permeability oil field and improving the recovery ratio. The migration of the nano-micron polymer particle dispersion system in the porous medium is complicated. In the experiment, the phenomena of non-uniform phase flow, such as particle agglomeration, micro-structure change and selective entry into the pore throat, are found, but the mechanism of non-uniform phase flow and its influence on the enhanced oil recovery are still not studied. Therefore, how to scientifically describe the complex seepage law of the nano-micron polymer particle dispersion system and the mechanism of enhanced oil recovery become the key problem for the application of the nano-micron polymer particle size-adjusting technology. The time required for the first filled pores is/ methyl methacrylate (AA/ AM/ MMA) particles, and a series of experiments and theoretical research have been carried out on the non-uniform phase flow characteristics and the enhanced oil recovery mechanism. research:1. hydration-based expansion experiment and flow The rheological model of the dispersion system considering the dynamic change of the particle and the interaction force between the expanded polymer particles was established, and the degree of hydration and expansion of the polymer particles and the rheological properties of the dispersion system were analyzed. 2. Two non-uniform flow phenomena in the process of migration and retention of the nano-micron polymer particles in the porous media were found through the micro-simulation and visual experiment. The distribution of the phase concentration is established. The mathematical model of the radial non-uniform phase distribution of the volume concentration of the polymer particles in the micro-circular tube is established. The distribution of the particle and the flow of the dispersion system are analyzed by the factors such as particle expansion, shear modulus, solvent viscosity and shear rate. The effect of the law on the distribution of the local non-uniform phase of the red blood cells was introduced, and the distribution of the polymer particles in the non-uniform phase in the throat of the porous throat was quantified and analyzed. in that present invention, the migration model of the three-dimensional hair bundle network of the nano-micron polymer particle is established, and the simulation result shows that the polymer particle is concentrated in the main flow channel, and the flow field distribution is adjusted, so that the flow resistance in the pore throat in that equilibrium state,3. based on the two-phase relative permeability experiment, a parallel wool bundle model of a nano-micron polymer system is established, the non-uniform phase concentration distribution of the polymer particle is taken into account, and the two-phase relation of the two phases in the dispersion system oil displacement process is simulated and analyzed, The change rule of permeability is as follows: the oil phase and the isoosmotic point are shifted to the right after injection of the dispersion system, and the end of the phase infiltration curve of the water phase is in a concave shape, that is, at the water saturation of the high water content, When the non-uniform phase concentration distribution of the polymer particles is considered, the high permeability channel decreases with the dispersion system. step-by-step plugging.4. Establish the drag coefficient and the residue of the dispersion system based on the nano-micron polymer particle plugging experiment In this paper, the relationship between the resistance coefficient and the non-uniform phase concentration of the polymer particles is established, and the factors such as the injection speed, the particle size and the particle concentration are considered. Relative permeability calculation model. 5. A two-dimensional network model simulation method for the dispersion system of a nano-micron polymer particle is established, and the residual oil distribution after injection of the polymer particles and the proportion of the remaining oil of different types are simulated, and the polymer particles are disclosed. 6. To establish a mathematical model of the dispersion system of a nano-micron polymer particle dispersion system in a heterogeneous layered formation, to simulate the non-uniform phase distribution of the polymer particles and to simulate the improvement of the polymer particles. The influence of the factors such as the concentration of the particles, the injection quantity and the time of the injection is clarified, and the non-uniform phase particles are revealed. The concentration distribution is beneficial to the expansion of the sweep volume. In this paper, the experimental research, the theoretical analysis and the numerical calculation are carried out. The main results are as follows: the hydration and expansion characteristics of the particles are the important factors of the viscosity of the dispersion system and the non-uniform phase flow, and the expansion range of the particles The larger the degree, the greater the thickness of the lubrication layer on the solid wall boundary and the non-uniform phase distribution of the particle concentration porous medium can gradually block the low-flow resistance pore throat, In that study, the non-uniform phase distribution of the particle concentration of the nano-micron polymer is beneficial to the expansion of the sweep volume and the increase of the permeability of the low-permeability layer, so as to further analyze the nano-micron polymer particle.
【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TB383.1

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