吉7井区稠油自乳化特征分析*

Analysis of Self-emulsifying Characteristics of Heavy Oil in Ji 7 Area

谢建勇 石 彦 褚艳杰 李 旭 刘娟丽 韩晓程

XIE Jianyong，SHI Yan，CHU Yanjie，LI Xu，LIU Juanli，HAN Xiaocheng

吉7井区深层稠油油藏采用水驱开发，生产过程中乳化现象普遍，为了了解乳化作用对开发效果的影响，对 吉7井口产出液的乳化特征进行了分析，通过滤纸润湿法判断产出液类型，采用水中氯离子含量的变化判断乳化 发生的时机，并通过显微镜镜下观察乳状液液滴粒径分布评价其稳定性。实验表明，吉7原油具有特殊的乳化性 能，在没有添加外来乳化剂的情况下，油水之间能够实现快速自发乳化，乳化发生的时机早，乳化液含水率高，液 滴分散均匀，接近微乳液尺寸，具有良好的稳定性，黏度较乳化前提高2.23倍，有利于形成稳定的水驱前缘，可大 幅度提高水驱采收率，与生产实际相吻合。吉7井区初期方案预测采收率只有15%，目前油田采出程度已接近 20%，综合含水稳定在40%，乳化作用使实际开发效果远远好于预测。图6表4参20

The deep heavy oil reservoir in Ji 7 area is developed by water flooding，and the emulsion phenomenon is common during development process. In order to understand the effect of emulsification on the development，the emulsification characteristics of the produced fluid were analyzed，the wetting types of produced fluid was determined through by the filter paper method，and emulsifying time was judged by analysis of the change of chloride ion content in water，the emulsion droplet size distribution was observed under a microscope lens and its stability was evaluated. Experimental results showed that the crude oil in JI 7 had special emulsification property. That is，the oil and water could be emulsified spontaneously and quickly even if without the addition of emulsifiers. The emulsifying time was early，the water content of emulsion was high，and the droplet dispersion was uniform and the size was close to that of microemulsion，exhibiting good stability. The viscosity of the emulsion was 2.23 times higher than crude oil before emulsification，which was favorable for forming stable water drive front，and greatly improving water drive recovery. The recovery rate was predicted to be 15% ，however，the current recovery degree was nearly 20% and the comprehensive water cut was kept at 40%. It was obvious that self-emulsification made the actual development effect far better than predicted.

10.19346/j.cnki.1000-4092.2021.03.013