为提高海上油田微球调驱剂浓度检测效率和精度,及时有效指导大井距条件下微球调驱作业的动态调整,渤海油田引入碳量子点合成制备了新型荧光核壳微球调驱剂,采用激光粒度仪、荧光光谱仪、扫描电子显微镜等化学手段和物理模拟方法,评价了荧光材料调驱剂基本性能和运移规律.结果表明,荧光材料调驱剂与渤海油田常用核壳微球调驱剂理化性能、封堵性能相近,采出液中荧光调驱剂浓度与462 nm处的荧光发射峰值呈正比线性关系,可实现采出液浓度简单高效检测;荧光材料调驱剂多孔介质中运移初期,浓度与距离呈波峰式分布,局部浓度较高;随注入水不断驱替,储层的吸附达到基本稳定,不同距离下浓度相差不大.本研究为海上油田微球调驱技术的浓度检测和动态调整提供了新思路.
A new type of fluorescent material profile control and displacement agent was synthesized by carbon quantum dots in Bohai oilfield,in order to improve the detection efficiency and accuracy of microsphere control and displacement agent concentration in offshore oil fields,and to guide the dynamic adjustment of microsphere control and displacement operation under the condition of large well distance in time and effectively.The basic properties and migration laws of fluorescent material profile control and displacement agent were evaluated by chemical and physical simulation methods such as laser particle size analyzer,fluorescence spectrometer and scanning electron microscope.The results show that the physicochemical and plugging properties of the fluorescent material profile control and displacement agent are similar to those of commonly used core-shell microsphere control and displacement agents in Bohai oilfield.The concentration of the fluorescent profile control and displacement agent in the produced liquid is linearly proportional to the fluorescence emission peak at 462 nm,which can achieve simple and efficient detection of produced liquid concentration.At the initial stage of migration of the fluorescent material profile control and displacement agent in porous media,the concentration of the agent shows a peak-shaped distribution along the distance,indicating a local accumulation of the agent.With the continuous displacement of the injected water,the adsorption of the reservoir is basically stable,and the concentration difference is not significant at different distances.This study provides a new approach for concentration detection and dynamic adjustment of microsphere profile control and displacement technology in offshore oil fields.