压裂液携砂性能和交联过程流变动力学研究

发布时间：2018-06-20 02:30

本文选题：本征交联流变动力方程 + 剪切交联流变动力学方程　；参考：《华东理工大学》2015年硕士论文

【摘要】：本文研究了羟丙基瓜尔胶(HPG)、改性纤维素(FAG-500)、耐高温聚合物(XST239)、耐海水聚合物(XST252)和速溶黄原胶(XCD)五种线性胶体系中,单颗粒支撑剂沉降速率与体系粘弹性的关系。研究了羟丙基瓜尔胶、改性纤维素和耐高温聚合物的静态交联过程和本征交联流变动力学方程,以及稳态剪切流场中的交联过程和剪切交联流变动力学方程,获得以下结论：1)线性胶压裂液具有良好的剪切变稀性质,流动曲线可用非线性共转Jeffreys模型描述。单颗粒支撑剂陶粒在五种线性胶压裂液中的沉降速率与线性胶粘、弹模量和复黏度的关系符合幂律模型,模型参数与线性胶种类相关。证明线性胶溶液具有微观网络结构。2)明确了静态交联过程中交联温度、交联剂浓度和稠化剂浓度等对HPG、FAG-500和XST239压裂液体系弹性因子EI变化曲线的影响,证实压裂液本征交联流变动力学方程可表征静态交联过程,获得了HPG、FAG-500和XST239压裂液在实验条件范围内本征交联流变动力学方程。其中,FAG-500体系的本征交联过程分为两个阶段,均可用交联流变动力学方程描述。3)在剪切流场中,明确了交联温度、交联剂浓度、稠化剂浓度和剪切速率等因素对HPG、FAG-500和XST239压裂液体系交联过程中黏度随时间的变化关系。建立了压裂液剪切交联流变动力学方程,可确切表征剪切交联流变过程,获得了各压裂液在实验条件范围内剪切交联流变动力学方程。4)在可视化压裂支撑剂裂缝剖面大型物模装置中,获得了不同压裂液体系、不同支撑剂种类和不同砂比携砂液在平行板中的流动状态；明确了携砂液在模拟管路中的交联过程,证明剪切交联流变动力学方程可表征交联过程黏度随时间变化曲线,模型参数物理意义明确合理。本文的研究结果为压裂液的应用提供流变学基础。
[Abstract]:In this paper, the relationship between the settling rate of single particle proppant and viscoelasticity of five linear adhesive systems, HPGG, FAG-500, XST239, XST252 and XCD) has been studied. The static crosslinking process and intrinsic crosslinking rheodynamic equations of hydroxypropyl guar gum, modified cellulose and high temperature resistant polymers, as well as the crosslinking process and shear crosslinking kinetics equation in steady shear flow field were studied. The following conclusions are obtained: 1) the linear gel fracturing fluid has good shear thinning property and the flow curve can be described by nonlinear co-rotating Jeffreys model. The relationship between settling rate and linear adhesive elastic modulus and complex viscosity of single particle proppant ceramsite in five kinds of linear adhesive fracturing fluids is in accordance with the power law model and the model parameters are related to the type of linear adhesive. It is proved that linear gel solution has microcosmic network structure. 2) the effects of crosslinking temperature, crosslinking agent concentration and thickener concentration on the elastic factor ei curves of HPGN FAG-500 and XST239 fracturing fluids are determined. It is proved that the intrinsic crosslinking rheodynamic equation of fracturing fluid can characterize the static crosslinking process, and the intrinsic crosslinking rheodynamic equations of HPGFFAG-500 and XST239 fracturing fluid are obtained in the range of experimental conditions. The intrinsic crosslinking process of FAG-500 system is divided into two stages, both of which can be described by the crosslinking rheological kinetics equation .3) in the shear flow field, the crosslinking temperature and the concentration of crosslinking agent are determined. The effect of thickener concentration and shear rate on the viscosity of HPGF FAG-500 and XST239 fracturing fluid system during crosslinking was studied. The rheological equation of shear crosslinking of fracturing fluid was established, and the rheological process of shear crosslinking could be accurately characterized. The rheological equation of shear crosslinking for each fracturing fluid was obtained in the range of experimental conditions. 4) different fracturing fluid systems were obtained in a large scale model device of fracture profile of fracturing proppant. The flow state of sand carrying fluid with different proppant types and different sand ratios in parallel plates was determined, the crosslinking process of sand carrying fluid in simulated pipes was clarified, and the shear crosslinking rheological kinetics equation was proved to be able to characterize the viscosity curve of crosslinking process with time. The physical meaning of the model parameters is clear and reasonable. The results of this paper provide a rheological basis for the application of fracturing fluids.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.12

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