页岩储层保护用O/W纳米乳液的制备

doi:10.11949/j.issn.0438-1157.20150560

化工学报 ›› 2015, Vol. 66 ›› Issue (11): 4565-4571.DOI: 10.11949/j.issn.0438-1157.20150560

页岩储层保护用O/W纳米乳液的制备

邱正松¹, 董兵强¹, 钟汉毅¹, 王伟吉¹, 赵欣¹, 宋丁丁¹, 罗洋²

1 中国石油大学(华东)石油工程学院, 山东青岛 266580;
2 大庆油田采油六厂, 黑龙江大庆 163000

收稿日期:2015-05-05 修回日期:2015-07-16 出版日期:2015-11-05 发布日期:2015-11-05
通讯作者: 邱正松
基金资助:
国家自然科学基金项目(51474236);中国石油集团公司重点项目(2014A-4212);中国博士后科学基金项目(2014M551986);山东省博士后创新项目专项资金项目(201303060);中央高校基本科研业务费专项资金项目(14CX06093A)。

Preparation of oil-in-water nanoemulsions used for protection ofshale gas reservoirs

QIU Zhengsong¹, DONG Bingqiang¹, ZHONG Hanyi¹, WANG Weiji¹, ZHAO Xin¹, SONG Dingding¹, LUO Yang²

1 College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
2 No.6 Oil Production Plant of Daqing Oilfield, Daqing 163000, Heilongjiang, China

Received:2015-05-05 Revised:2015-07-16 Online:2015-11-05 Published:2015-11-05
Supported by:
supported by the National Natural Science Foundation of China(51474236), the Major Projects of CNPC (2014A-4212), the China Postdoctoral Science Foundation Funded Project (2014M551986), the Postdoctoral Innovative Project Foundation of Shandong Province (201303060) and the Fundamental Research Funds for the Central Universities (14CX06093A).

摘要/Abstract

摘要：

针对钻井液滤液侵入页岩储层极易导致严重的水敏损害及液相圈闭损害问题,采用两步稀释法研备出粒径极小、分散性好且长期稳定的页岩储层保护用水包油(O/W)纳米乳液。选取Gemini季铵盐型表面活性剂GTN、Tween80与正丁醇三者复配作为表面活性剂组分(记为S+A),通过室内实验研究了水相中NaCl质量分数对NaCl溶液/(S+A)/正辛烷体系微乳液特性的影响,考察了微乳液相转变温度(PIT)、制备方法及其微观构型等因素对采用两步稀释法制备的纳米乳液粒径的影响,同时对纳米乳液体系的失稳机理进行研究。结果表明,NaCl溶液/(S+A)/正辛烷体系微乳液中NaCl的加入可以显著提高表面活性剂组分的乳化效率,改变微乳液微观构型,使PIT显著降低;当剂油体积比(R_os)为7:3时,通过调节双连续微乳液的PIT接近实验乳化温度,采用两步稀释法制备的O/W纳米乳液粒径最小且分布范围最窄;NaCl溶液/(S+A)/正辛烷体系纳米乳液主要失稳机理为奥氏熟化;纳米乳液具有良好的储层保护作用。

关键词: 纳米乳液, 微乳液, 表面活性剂, 奥氏熟化, 界面张力, 石油

Abstract:

There is a very prominent problem of water sensitive damage and liquid trap damage caused by drilling fluid during the exploitation process of shale gas reservoirs. A two-step dilution method for preparation of oil-in-water nanoemulsions used for the protection of shale gas reservoirs was introduced. The nanoemulsion could have small droplet sizes and fine dispersity. Selecting mixtures composed of Gemini hyamine surfactant GTN, Tween80 and n-butyl alcohol as surfactant component (referred to as S+A), the effects of mass concentration of NaCl on the properties of NaCl solution/(S+A)/n-octane systems was studied. The influence of the phase inversion temperature, emulsification methods and the structure of microemulsion on the droplet size of nanoemulsion was investigated. The instability mechanism of nanoemulsion system was researched. The results showed that increasing the concentration of NaCl could effectively change the microemulsion structure of NaCl solution/(S+A)/n-octane system, decrease the phase inversion temperature significantly and improve the emulsification efficiency. Oil-in-water nanoemulsions prepared by two-step dilution method had the smallest droplet size and the best dispersity at R_os 7:3 when the emulsification temperature approached the phase inversion temperature. The mechanism of instability can be attributed to Ostwald ripening in NaCl solution/(S+A)/n-octane system. Nanoemulsion had good performance for protecting shale gas reservoirs.

Key words: nanoemulsion, microemulsion, surfactants, Ostwald ripening, interfacial tension, petroleum

中图分类号:

O648

邱正松, 董兵强, 钟汉毅, 王伟吉, 赵欣, 宋丁丁, 罗洋. 页岩储层保护用O/W纳米乳液的制备[J]. 化工学报, 2015, 66(11): 4565-4571.

QIU Zhengsong, DONG Bingqiang, ZHONG Hanyi, WANG Weiji, ZHAO Xin, SONG Dingding, LUO Yang. Preparation of oil-in-water nanoemulsions used for protection ofshale gas reservoirs[J]. CIESC Journal, 2015, 66(11): 4565-4571.

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页岩储层保护用O/W纳米乳液的制备

Preparation of oil-in-water nanoemulsions used for protection ofshale gas reservoirs

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