非均匀电场协同扰流场高效破乳脱水技术

Study on high-efficiency demulsification and dehydration technology by synergizing non-uniform electric field and flow disturbance field

摘要

随着油田开发进入高含水期,稠油乳状液脱水难度显著增加,传统电脱水技术难以满足高含水期乳状液脱水需求,亟需研发高效稳定的脱水新技术。采用数值模拟、室内实验相结合的方法,系统研究电极结构、电场参数及操作参数对脱水效果的影响规律,阐明非均匀电场协同扰流场的破乳脱水机制。结果表明:八字板-棒状电极可同时构建稳定非均匀电场与流场扰动,既能强化液滴碰撞聚结,又能有效降低垮电场风险,其脱水效率显著优于传统平板电极;在考察范围内脱水处理的实验条件为60 ℃、60 min、17 kHz时脱水效果最优;电场强度存在临界值(300 kV/m),低于临界值时聚结效果随场强提升而增强,超过则导致液滴破碎;流量通过停留时间与扰动强度的双重作用影响脱水效率。

Abstract

As oilfield development enters the high water cut stage, the difficulty in dehydrating heavy oil emulsions increases significantly. Traditional electric dehydration technology can't meet the emulsions dehydration requirements during the high-water-cut stage, so it is urgent to develop a new high-efficiency and stable dehydration technology. A combined approach of numerical simulation and indoor experiments was used to systematically studies the effects of electrode structure, electric field parameters and operating parameters on dehydration efficiency. The demulsification and dehydration mechanism of the non-uniform electric field combined with the turbulent flow field was clarified. The results show that the plate-rod electrode can simultaneously construct a stable non-uniform electric field and flow field disturbance. It not only enhances droplet collision and coalescence, but also effectively reduces the risk of electric field collapse. Within the experimental range, the best dehydration performance is obtained at 60 ℃, 60 min, and 17 kHz. There is a critical value of electric field intensity (300 kV/m). When the intensity is lower than the critical value, the coalescence effect increases with the increase of field intensity. However, when the intensity exceeds the critical value, it leads to droplet breakage. The flow rate affects the dehydration efficiency through the dual effects of residence time and disturbance intensity.

关键词

电场 / 流场 / 高含水乳状液 / 破乳 / 脱水

Key words

electric field / flow field / high water content emulsion / demulsification / dehydration

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基金资助

国家自然科学基金项目(52574095)

山东省自然科学基金项目(ZR2024ME039)

山东省泰山学者青年专家计划项目(tsqn202312125)