A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs

Abstract Inter-salt shale oil reservoirs located between two salt layers are always accompanied by high temperature and high salinity. However, the present commonly used water-soluble polymers in fracturing fluids suffer from poor tolerance to high temperature and high salinity. Thermoviscosifying p...

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Autores principales: Xian’e Li, Hong-Yao Yin, Ru-Sheng Zhang, Jia Cui, Jun-Wen Wu, Yu-Jun Feng
Formato: article
Lenguaje:EN
Publicado: KeAi Communications Co., Ltd. 2019
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Acceso en línea:https://doaj.org/article/53bffca6659e4ec3b1012e44efb60343
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spelling oai:doaj.org-article:53bffca6659e4ec3b1012e44efb603432021-12-02T09:28:23ZA salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs10.1007/s12182-019-0329-31672-51071995-8226https://doaj.org/article/53bffca6659e4ec3b1012e44efb603432019-05-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-019-0329-3https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract Inter-salt shale oil reservoirs located between two salt layers are always accompanied by high temperature and high salinity. However, the present commonly used water-soluble polymers in fracturing fluids suffer from poor tolerance to high temperature and high salinity. Thermoviscosifying polymers (TVP) whose aqueous solution shows viscosity increase upon increasing temperature and salt concentration have received considerable attention recently, which is promising for utilization in fracturing fluids to overcome these problems. In this work, both the salt-induced viscosifying property and mechanism of a TVP solution were investigated and the performance of TVP used as fracturing fluid based on the conditions of the Jianghan inter-salt shale oil reservoir in China was evaluated. It is found that the salt-induced viscosifying property of the TVP solution decreases with temperature and shear rate, but increases with polymer concentration. The number of intermolecular hydrophobic domains increases with the salt concentration contributing to the strengthening of a 3D network structure, which results in an increase in viscosity. In addition, the TVP fracturing fluid formulated with saturated brine exhibits excellent temperature and shear resistance, sand-suspending performance, and gel-breaking performance. Its viscosity remains above 50 mPa s after being sheared for 1 h even at a high temperature of 140 °C and the sand-suspending stability can be maintained for more than 1 week at 100 °C. Furthermore, the fracturing fluid can be easily broken down within 12 h using 0.2 wt%–0.3 wt% potassium persulfate without residue.Xian’e LiHong-Yao YinRu-Sheng ZhangJia CuiJun-Wen WuYu-Jun FengKeAi Communications Co., Ltd.articleFracturingSalt-induced viscosifyingThermoviscosifyingSmart polymerRheological propertiesScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 4, Pp 816-829 (2019)
institution DOAJ
collection DOAJ
language EN
topic Fracturing
Salt-induced viscosifying
Thermoviscosifying
Smart polymer
Rheological properties
Science
Q
Petrology
QE420-499
spellingShingle Fracturing
Salt-induced viscosifying
Thermoviscosifying
Smart polymer
Rheological properties
Science
Q
Petrology
QE420-499
Xian’e Li
Hong-Yao Yin
Ru-Sheng Zhang
Jia Cui
Jun-Wen Wu
Yu-Jun Feng
A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs
description Abstract Inter-salt shale oil reservoirs located between two salt layers are always accompanied by high temperature and high salinity. However, the present commonly used water-soluble polymers in fracturing fluids suffer from poor tolerance to high temperature and high salinity. Thermoviscosifying polymers (TVP) whose aqueous solution shows viscosity increase upon increasing temperature and salt concentration have received considerable attention recently, which is promising for utilization in fracturing fluids to overcome these problems. In this work, both the salt-induced viscosifying property and mechanism of a TVP solution were investigated and the performance of TVP used as fracturing fluid based on the conditions of the Jianghan inter-salt shale oil reservoir in China was evaluated. It is found that the salt-induced viscosifying property of the TVP solution decreases with temperature and shear rate, but increases with polymer concentration. The number of intermolecular hydrophobic domains increases with the salt concentration contributing to the strengthening of a 3D network structure, which results in an increase in viscosity. In addition, the TVP fracturing fluid formulated with saturated brine exhibits excellent temperature and shear resistance, sand-suspending performance, and gel-breaking performance. Its viscosity remains above 50 mPa s after being sheared for 1 h even at a high temperature of 140 °C and the sand-suspending stability can be maintained for more than 1 week at 100 °C. Furthermore, the fracturing fluid can be easily broken down within 12 h using 0.2 wt%–0.3 wt% potassium persulfate without residue.
format article
author Xian’e Li
Hong-Yao Yin
Ru-Sheng Zhang
Jia Cui
Jun-Wen Wu
Yu-Jun Feng
author_facet Xian’e Li
Hong-Yao Yin
Ru-Sheng Zhang
Jia Cui
Jun-Wen Wu
Yu-Jun Feng
author_sort Xian’e Li
title A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs
title_short A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs
title_full A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs
title_fullStr A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs
title_full_unstemmed A salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs
title_sort salt-induced viscosifying smart polymer for fracturing inter-salt shale oil reservoirs
publisher KeAi Communications Co., Ltd.
publishDate 2019
url https://doaj.org/article/53bffca6659e4ec3b1012e44efb60343
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