The emulsion that is mixed with returned acidizing fluids and crude oil has strong stability, which may have a great influence on the crude oil dehydration and the safe operation of crude setting tank. The effects of temperature, demulsifier dosage, pH value, viscosity reducer dosage on the viscosity of emulsion and demulsification performance are studied, and the microscopic changes of emulsion at different times are observed. It is indicated by experiments that the viscosity of emulsion mixed with returned acidizing fluids and crude oil declines significantly firstly and then decreases gradually with the increasing temperature; when the temperature is lower than 40℃, the emulsion has stronger stability, however, between the temperature of 50-60℃, the dehydration rate does not increase significantly with the increasing temperature. So it is concluded that the best demulsification temperature is 50℃. It is also found that emulsion viscosity could be decreased by adding demulsifier, but not significantly; the more the dosage of demulsifier is, the better the demulsification performance is, and the dehydration rate is not remarkably increased when the demulsifier dosage is more than 150 mg/L. So it is concluded that the best demulsifier dosage is 150 mg/L. Moreover, it is beneficial for demulsification performance to adjust the returned acidizing fluids pH value to 6.0-7.0. With the increasing pH value, the oil water interface grows suddenly angular and the structure of crude oil after dewatering is more tight. Finally, the dehydrating speed is improved obviously by using viscosity reducer. These conclusions can be used as references to the demulsification and dehydration of emulsion that is flowed back early after the implementation of acidification.
WAN Liping
,
KONG Bin
,
ZHU Li
,
MENG Yingfeng
,
ZHOU Bonian
,
ZHAI Lituan
. Study on demulsification and dehydration of emulsion of returned acidizing fluids and crude oil[J]. Science & Technology Review, 2015
, 33(13)
: 39
-45
.
DOI: 10.3981/j.issn.1000-7857.2015.13.006
[1] 伊向艺, 张紫薇, 夏涛, 等. 不同酸液体系残酸-原油乳状液破乳室内 评价[J]. 科技导报, 2014, 32(19): 58-63. Yi Xiangyi, Zhang Ziwei, Xia Tao, et al. Demulsification experiment evaluation of emulsion of crude oil and different spent acids[J]. Science & Technology Review, 2014, 32(19): 58-63.
[2] 胡文丽, 汪伟英, 于洋洋, 等. 残酸返排液对原油乳状液破乳效果的影 响[J]. 断块油气田, 2007, 14(4): 78-79. Hu Wenli, Wang Weiying, Yu Yangyang, et al. Influence of reacted acid flow black fluid on crude oil emulsion[J]. Fault-Block Oil & Gas Field, 2007, 14(4): 78-79.
[3] 姜佳丽,苟社全,达建文, 等. 原油破乳研究进展[J]. 化学进展, 2009, 28(2): 214-221. Jiang Jiali, Gou shequan, Da Jianwen, et al. Recent advances in crude oil demulsification[J]. Progress in chemistry, 2009, 28(2): 214-221.
[4] 孙月文. 埕岛油田酸化油成因及乳化特性分析[J]. 油田化学, 2010, 27 (1): 22-25. Sun Yuewen. Origin and emulsifng behavior of acid sludge from Chengdao crude oil[J]. Oilfield Chemistry, 2010, 27(1): 22-25.
[5] 李洋, 雷群, 刘卫东, 等. 原油乳状液微观组构剖析[J]. 科技导报, 2010, 28(4): 88-92. Li Yang, Lei Qun, Liu Weidong, et al. Microcosmic composition of crude oil emulsion[J]. Science & Technology Review, 2010, 28(4): 88- 92.
[6] 范振中, 俞庆森. 残酸对原油脱水的影响及处理[J]. 浙江大学学报, 2005, 32(5): 546-549. Fan Zhenzhong, Yu Qingsen. Treatment of residual acid and its influence on the crude oil dehydration[J]. Journal of Zhejiang University, 2005, 32(5): 546-549.
[7] 康万利, 曹东青, 刘延莉, 等. 固体颗粒稳定乳状液研究进展[J]. 日用 化学工业, 2011, 41(4): 281-284. Kang Wanli, Cao Dongqing, Liu Yanli, et al. Progress of the research work with respect to solid particles-stabilized emulsions[J]. China Surfactant Detergent & Cosmetics, 2011, 41(4): 281-284.
[8] 李文艳. 固体颗粒对原油乳状液稳定性影响[D]. 上海: 华东理工大 学, 2010. Li Wenyan. Effect of particles on the stability of the crude oil emulsions[D]. Shanghai: South China University of Technology, 2010.
[9] 宋志峰, 张烨, 杨胜来, 等. 塔河油田含酸稠油破乳脱水工艺探讨[J]. 油田化学, 2012, 29(4): 482-485. Song Zhifeng, Zhang Ye, Yang Shenglai, et al. Study on the demulsification technology of acid-heavy oil emulsion in tahe oilfield[J]. Oilfield Chemistry, 2012, 29(4): 482-485.
[10] 李平, 郑晓宇, 朱建民, 等. 原油乳状液的稳定与破乳机理研究进展[J]. 精细化工, 2001, 18(2): 89-93. Li Ping, Zheng Xiaoyu, Zhu Jianmin, et al. Research progress of the stability and demulsification mechanism of the water- in- crude oil emulsion[J]. Fine Chemicals, 2001, 18(2): 89-93.
[11] 肖中华. 原油乳状液破乳机理及影响因素研究[J]. 石油天然气学报, 2008, 30(4): 165-168. Xiao Zhonghua. Crude oil emulsion demulsification mechanism and influencing factors of research [J]. Journal of Oil and Gas Technology, 2008, 30(4): 165-168.
[12] 张卫东, 程玉虎, 朱好华, 等. 油田化学剂对原油破乳剂YT-100脱水 效果的影响[J]. 油田化学, 2006, 23(2): 132-135. Zhang Weidong, Cheng Yuhu, Zhu Haohua, et al. Effects of oilfield chemicals on crude oil dehydration by demulsifier YT-100[J]. Oilfield Chemistry, 2006, 23(2): 132-135.
[13] Tambe D, Paulis J, Sharma M M. Factors controlling the stability of colloid- stabilized emulsions: IV. Evaluating the effectiveness of demulsifiers[J]. Journal of Colloid & Interface Science, 1995, 32(1): 463-469.
[14] Mohammed R A. Dewatering of crude oil emulsions 2. Interfacial properties of the asphaltic constituents of crude oil[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1993, 36(2): 237-242.
