QHD326油田氮气泡沫驱高温高压可视化实验研究—郑继龙

QHD32-6油田氮气泡沫驱高温高压可视化实验研究陈平，宋志学，郑继龙，张相春，赵军,吴晓燕（中海油能源发展股份有限公司钻采工程研究院，天津 塘沽 300452）摘 要：利用高温高压可视化填砂管

QHD32-6油田氮气泡沫驱高温高压可视化实验研究 陈平，宋志学，郑继龙，张相春，赵军,吴晓燕 （中海油能源发展股份有限公司钻采工程研究院，天津 塘沽 300452） 利用高温高压可视化填砂管，研究了静态和动态条件下N泡沫驱油过程中原油与泡沫的流动规律 摘要： 2 及其驱油机理，并对QHD32-6油田N泡沫驱泡沫体系进行优化。实验结果表明：压力的增大有利于更多N 22 溶入原油中，使原油黏度下降，有利于原油的采出；随温度升高，N泡沫在填沙管模型中的封堵作用逐渐 2 减弱。在90℃下，N泡沫体系仍具有较高的阻力系数，说明该体系具有良好的耐高温性能。随注入速度的 2 增加，泡沫产生的阻力因子增大；但压力过大容易形成气窜影响采收率，因此，应将注入速度控制在合理 范围以内（1～2mL/min）。 高温高压；可视化物理模型；氮气泡沫；驱油实验 关键词： Visualization studies on nitrogen-foam flooding experiment under high temperature and high pressure of QHD32-6 oilfield Chen ping, Song zhixue, Zheng jilong, Zhang xiangchun, Zhao jun, Wu xiaoyan (CNOOC Energy Technology &Oilfield Engineering Research Institute, Tanggu Tianjin, 300452) Abstract: The high temperature and high pressure visualized sand pack was applied to study the flowing laws and microscopic mechanism of oil displacement for crude oil and foam under static and dynamic situations during the process of Nfoam flooding. The experiment results showed that increasing of pressure could be 2 beneficial to dissolve more nitrogen in crude oil, which due to reducing of viscosity of crude oil and being good for oil recovery. With the increasing of temperature, the plugging effect became worse, however, high resistance coefficient for Nfoam system at 90℃, which indicated that the Nfoam system had a 22 high-temperature resistance. With the increasing of injection rate, the resistance factor also increased. However, high injection rate would cause gas channeling, therefore, the injection rate should be controlled within a reasonable range, such as 1-2mL/min. Keywords: high temperature and high pressure; visualized physical model; nitrogen-foam flooding; oil displacement experiment 前言 海上油田开发难度大、投资风险高，渤海油田采油工艺技术难度达到标定采收率指标，需尽快采用新 N 技术，以提高油田采收率。近几年来，泡沫驱提高采收率技术发展迅速。一方面，泡沫有较高的视粘度， 2 [1][2] “”“” 且具有遇油消泡、遇水稳定的特性；另一方面，泡沫具有堵大不堵小、堵水不堵油的特性。 QHD32-6 油田低幅度构造，边底水合采，油田含水上升快，产量递减大。为进一步挖掘剩余油潜力， QHD32-6N 解决储层非均质性强、注入水突进现象，为此在油田条件下进行了泡沫驱试验研究。 2 1N泡沫驱增油机理 2 [3] N41 一般认为，泡沫驱油增油的主要机理有以下个方面：（）泡沫体系中表面活性剂降低油水界面 2 23 张力，提高驱油效率。（）泡沫液视粘度较大，可有效降低油水流度比、扩大波及体积。（）泡沫具有 “”“” 遇油消泡、遇水稳定、堵大不堵小、堵水不堵油的特性，可有效封堵含油饱和度较低的高渗孔道，