聚合物水动力尺寸及注入界限研究

发布时间：2018-01-21 07:48

本文关键词： 水动力尺寸聚合物碱表活剂注入界限　出处：《中国科学院研究生院(渗流流体力学研究所)》2015年硕士论文　论文类型：学位论文

【摘要】：聚合物水溶液的分子形态除受自身结构与性质影响外,还与外界其他因素影响有关。聚合物的水动力尺寸是表征分子大小的一个重要参数。当溶液流经多孔介质时,如果聚合物分子尺寸过大,会造成地层堵塞,使聚合物的注入变得很困难,影响驱油效果。因此在实际矿场驱油时,选择合适的聚合物是取得驱油效果的关键。本文通过微孔滤膜装置分别研究了一元体系(聚合物)、二元体系(聚合物+表活剂、聚合物+碱)、三元体系(聚合物+表活剂+碱)中聚合物的水动力尺寸,明确了各种因素如聚合物分子量、矿化度、碱浓度等对聚合物水动力尺寸的影响。采取恒压驱替的方式,在7种渗透率(29～305×10-3μm2)的圆柱人造岩心上,进行了5种聚合物浓度(500～2500mg/L)和7种聚合物分子量(700～3000万)的正交组合流动实验,研究聚合物的注入性。通过上述研究,发现分子量、浓度、碱、表活剂等因素都对聚合物的分子尺寸有明显的影响,其中,分子量和浓度对聚合物分子尺寸的影响最大。在室内注入性实验的基础上,根据矿场实际资料与动态特征划定了聚合物合理注入能力界限,得到了聚合物的分子量和浓度与岩心渗透率的匹配关系,结合实际情况给出了不同渗透率所对应的聚合物分子量与浓度的选择建议：渗透率在30～100×10-3μm2,建议选择分子量700～1000万、浓度500～1500mg/L的聚合物注入；渗透率在100～200 × 10-3μ m2,建议选择分子量1500～1900万、浓度1000～2000mg/L的聚合物注入；渗透率在200～300×10-3μm2,建议选择分子量1900～2300万、浓度1500～2000mg/L的聚合物注入。
[Abstract]:The molecular morphology of polymer aqueous solution is affected by its own structure and properties. The hydrodynamic size of the polymer is an important parameter to characterize the molecular size. When the solution flows through the porous media, if the polymer molecule size is too large, it will cause formation blockage. It is very difficult to inject polymer, which affects the oil displacement effect. The selection of suitable polymer is the key to obtain the oil displacement effect. In this paper, the monomaterial systems (polymer and binary) (polymer surfactant, polymer base) were studied by microporous membrane device. The hydrodynamic size of the polymer in the ternary system (polymer surfactant alkali) has been determined for various factors such as polymer molecular weight and salinity. The effect of alkali concentration on the hydrodynamic size of polymer is studied. The method of constant pressure displacement is used in 7 kinds of permeability (29305 脳 10 ~ (-3) 渭 m ~ (2)) cylindrical artificial cores. The orthogonal flow experiments were carried out with five polymer concentrations of 500 mg / L and 7 polymers with molecular weight of 700 ~ 30 million). Through the above study, we found that the molecular weight, concentration, alkali, surfactant and other factors have a significant impact on the molecular size of the polymer, among them. The molecular weight and concentration have the greatest influence on the molecular size of polymer. On the basis of indoor injectability experiment, the reasonable injection ability limit of polymer is determined according to the actual field data and dynamic characteristics. The matching relationship between molecular weight and concentration of polymer and core permeability is obtained. According to the actual situation, the corresponding molecular weight and concentration of polymer with different permeability are suggested: the permeability is 30 脳 10 ~ (-3) 渭 m ~ (2), the recommended molecular weight is 700 ~ 10 million. The concentration of polymer was 500 ~ 1500mg / L; The permeability is 100 脳 10 ~ (-3) 渭 m ~ (-2). It is suggested that polymer injection with molecular weight of 1500 ~ 19 million and concentration of 1000mg / L of 2000mg / L should be selected. The permeability is 200 脳 10 ~ (-3) 渭 m ~ (2). It is suggested that polymer injection with molecular weight of 1900 ~ 23 million and concentration of 1 500 ~ 2 000 mg / L should be selected.
【学位授予单位】：中国科学院研究生院(渗流流体力学研究所)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE39

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