化学驱分质工具对溶液流动影响及工具优选研究

发布时间：2018-06-15 08:14

本文选题：分质注入工具 + 黏度　；参考：《东北石油大学》2017年硕士论文

【摘要】：目前大庆油田驱替技术已经从传统水驱逐渐向化学驱进行改变,在萨中等主力区块高渗透油层已经基本完成了聚驱,大庆油田驱替下一步目标是对低渗透油层进行高效开采。在原有笼统注入工艺技术中,由于聚合物溶液或三元复合溶液对一些油层配伍性较差,在驱替阶段流向了高渗透已开采油层,达不到针对低渗透油层的开采效果。为了提高整体开发效果,充分完成对低渗透层系的原油开采,大庆油田提出了单管多层分质分压注入工艺技术。本文通过对流经分质工具前后溶液的变化进行研究,得到相应数据,结合现场实验数据完成对分质工具的结构优选。首先,利用FLUENT软件,对不同结构的分质注入工具进行驱替液流经前后的流场分析,得出溶液流经前后速度、压力、湍动能的分布情况以及相应的参数变化,明确不同结构工具对溶液压力、流速、湍动能的影响:相同条件下直径为2mm的分注工具压降最大;直径越大,轴向速度维持距离越长;直径越大,轴向中心线两侧湍动能分布越均匀。其次,利用静态力学实验测试驱替溶液过不同直径分质工具前后黏弹性变化,得出驱替溶液黏度参数变化数值并利用第一法向应力差分析不同直径分质工具对流过溶液弹性影响。实验结果表明,溶液的粘度随剪切速率增加而降低,并呈幂律规律;而溶液的第一法向应力差随剪切速率的增加逐渐增加,表现为线性规律;随着聚合物质量浓度的增加,溶液的粘弹性增高;经过分质工具后的溶液粘弹性与未经处理前的溶液粘弹性规律一致,但各溶液的粘弹性均出现了不同程度的下降。最后,利用计算机编程技术,结合溶液流过工具前后各项数据变化以及现场工具需求,针对化学驱分质工具优选进行可视化编程,进行现场试验验证,并得出结论:软件具有一定准确性,大大提高了工具优选的效率以及准确性。本文研究内容对油田现场分层注采过程中分质工具的优选提供一定的辅助指导意义。
[Abstract]:At present, the displacement technology of Daqing oilfield has been changed from traditional water flooding to chemical flooding, and the polymer flooding has been basically completed in the high permeability reservoir in the middle main area of sa. The next goal of displacement in Daqing oilfield is to develop the low permeability reservoir efficiently. In the original general injection technology, due to the poor compatibility of polymer solution or ternary solution to some reservoirs, it flows to the high permeability oil layer in the displacement stage, which can not reach the recovery effect for the low permeability reservoir. In order to improve the overall development effect and fully complete the crude oil production of low permeability series, Daqing Oilfield has put forward the technology of single pipe multilayer split pressure injection. In this paper, the changes of the solution before and after passing through the dividing tool are studied, the corresponding data are obtained, and the structure of the quality separation tool is optimized by combining the field experimental data. Firstly, by using fluent software, the flow field before and after the displacement fluid flow is analyzed with different structure mass separation injection tools, and the distribution of the velocity, pressure, turbulent kinetic energy and the corresponding parameters before and after the solution passing through are obtained. The influence of different structure tools on the pressure, velocity and turbulent kinetic energy of the solution is determined. The pressure drop of the injection tool with diameter 2mm is the largest under the same conditions; the larger the diameter, the longer the maintaining distance of axial velocity, the larger the diameter, the larger the pressure drop is. The distribution of turbulent kinetic energy on both sides of axial center line is more uniform. Secondly, the viscoelastic changes before and after displacing solution with different diameters were measured by static mechanical experiment. The change value of viscosity parameters of displacement solution was obtained and the effect of different diameters on the elasticity of solution was analyzed by using the first normal stress difference. The experimental results show that the viscosity of the solution decreases with the increase of the shear rate and follows the law of power law, while the first normal stress difference of the solution increases gradually with the increase of the shear rate, showing a linear rule, and with the increase of the mass concentration of the polymer, The viscoelasticity of the solution is increased, and the viscoelasticity of the solution is consistent with that of the untreated solution, but the viscoelasticity of each solution decreases to some extent. Finally, using computer programming technology, combined with the changes of the data before and after the solution flow through the tool and the field tool requirements, visual programming was carried out for the chemical flooding quality separation tools, and the field test was carried out. It is concluded that the software has certain accuracy, which greatly improves the efficiency and accuracy of tool selection. The research content of this paper provides some auxiliary guidance significance for the optimization of the quality separation tools in the field injection and production process of stratified oil fields.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

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