Effect of Kaolinite on water-in-oil emulsion formed by steam injection during tertiary oil recovery: A Case study of an Omani heavy oil sandstone reservoir with a high Kaolinite sludge content

Ibrahim Al Hadabi, Kyuro Sasaki, Yuichi Sugai

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3 Citations (Scopus)

Abstract

The present work investigates the effects of kaolinite on viscosity and surface tension of water-in-oil (W/O) emulsions formed from an Omani heavy crude oil and steam. In Oman, steam flooding is widely used as tertiary means to recover untapped heavy oils. However, the production of sludge along with residual oil is one of the major issues faced in the field. An Omani heavy oil (API gravity of 21.5°) enriched with kaolinite at the fixed concentration of 10 wt % was used to form W/O emulsions by steam injection. Rheological properties of generated emulsions were investigated over the temperature range of 30-80°C. Not only was the presence of fine particles (kaolinite) found to alter the viscosity of W/O emulsions (about 20% lower than that without kaolinite), but also kaolinite clay particles induced a thixotropic behavior of W/O emulsions. The latter observation was thought to be subsequent to a chemistry occurring upon the contact between kaolinite particles and condensed water. At a fixed concentration of kaolinite, the W/O emulsion viscosity was found to decrease with the increase in the water/oil ratio (WOR). A reverse trend was seen for emulsion formed without the presence of kaolinite. This study has also highlighted the potential of kaolinite to alter the wettability of a formation from oil-wet to water-wet with steam-condensed water.

Original languageEnglish
Pages (from-to)10917-10924
Number of pages8
JournalEnergy & Fuels
Volume30
Issue number12
DOIs
Publication statusPublished - Dec 15 2016

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Kaolin
Petroleum reservoirs
Kaolinite
Steam
Sandstone
Emulsions
Oils
Crude oil
Recovery
Water
Viscosity
Petroleum
Application programming interfaces (API)
Surface tension
Wetting
Gravitation
Clay

All Science Journal Classification (ASJC) codes

  • Fuel Technology

Cite this

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title = "Effect of Kaolinite on water-in-oil emulsion formed by steam injection during tertiary oil recovery: A Case study of an Omani heavy oil sandstone reservoir with a high Kaolinite sludge content",
abstract = "The present work investigates the effects of kaolinite on viscosity and surface tension of water-in-oil (W/O) emulsions formed from an Omani heavy crude oil and steam. In Oman, steam flooding is widely used as tertiary means to recover untapped heavy oils. However, the production of sludge along with residual oil is one of the major issues faced in the field. An Omani heavy oil (API gravity of 21.5°) enriched with kaolinite at the fixed concentration of 10 wt {\%} was used to form W/O emulsions by steam injection. Rheological properties of generated emulsions were investigated over the temperature range of 30-80°C. Not only was the presence of fine particles (kaolinite) found to alter the viscosity of W/O emulsions (about 20{\%} lower than that without kaolinite), but also kaolinite clay particles induced a thixotropic behavior of W/O emulsions. The latter observation was thought to be subsequent to a chemistry occurring upon the contact between kaolinite particles and condensed water. At a fixed concentration of kaolinite, the W/O emulsion viscosity was found to decrease with the increase in the water/oil ratio (WOR). A reverse trend was seen for emulsion formed without the presence of kaolinite. This study has also highlighted the potential of kaolinite to alter the wettability of a formation from oil-wet to water-wet with steam-condensed water.",
author = "{Al Hadabi}, Ibrahim and Kyuro Sasaki and Yuichi Sugai",
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T1 - Effect of Kaolinite on water-in-oil emulsion formed by steam injection during tertiary oil recovery

T2 - A Case study of an Omani heavy oil sandstone reservoir with a high Kaolinite sludge content

AU - Al Hadabi, Ibrahim

AU - Sasaki, Kyuro

AU - Sugai, Yuichi

PY - 2016/12/15

Y1 - 2016/12/15

N2 - The present work investigates the effects of kaolinite on viscosity and surface tension of water-in-oil (W/O) emulsions formed from an Omani heavy crude oil and steam. In Oman, steam flooding is widely used as tertiary means to recover untapped heavy oils. However, the production of sludge along with residual oil is one of the major issues faced in the field. An Omani heavy oil (API gravity of 21.5°) enriched with kaolinite at the fixed concentration of 10 wt % was used to form W/O emulsions by steam injection. Rheological properties of generated emulsions were investigated over the temperature range of 30-80°C. Not only was the presence of fine particles (kaolinite) found to alter the viscosity of W/O emulsions (about 20% lower than that without kaolinite), but also kaolinite clay particles induced a thixotropic behavior of W/O emulsions. The latter observation was thought to be subsequent to a chemistry occurring upon the contact between kaolinite particles and condensed water. At a fixed concentration of kaolinite, the W/O emulsion viscosity was found to decrease with the increase in the water/oil ratio (WOR). A reverse trend was seen for emulsion formed without the presence of kaolinite. This study has also highlighted the potential of kaolinite to alter the wettability of a formation from oil-wet to water-wet with steam-condensed water.

AB - The present work investigates the effects of kaolinite on viscosity and surface tension of water-in-oil (W/O) emulsions formed from an Omani heavy crude oil and steam. In Oman, steam flooding is widely used as tertiary means to recover untapped heavy oils. However, the production of sludge along with residual oil is one of the major issues faced in the field. An Omani heavy oil (API gravity of 21.5°) enriched with kaolinite at the fixed concentration of 10 wt % was used to form W/O emulsions by steam injection. Rheological properties of generated emulsions were investigated over the temperature range of 30-80°C. Not only was the presence of fine particles (kaolinite) found to alter the viscosity of W/O emulsions (about 20% lower than that without kaolinite), but also kaolinite clay particles induced a thixotropic behavior of W/O emulsions. The latter observation was thought to be subsequent to a chemistry occurring upon the contact between kaolinite particles and condensed water. At a fixed concentration of kaolinite, the W/O emulsion viscosity was found to decrease with the increase in the water/oil ratio (WOR). A reverse trend was seen for emulsion formed without the presence of kaolinite. This study has also highlighted the potential of kaolinite to alter the wettability of a formation from oil-wet to water-wet with steam-condensed water.

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