Exploration of the difference in molecular structure of n-C7 and CO2 induced asphaltenes

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Abstract

Determination of the molecular structure of asphaltenes, especially in their native environment, is a formidable challenge in petroleum chemistry. Here we demonstrate that a combination of different spectroscopy and imaging based experimental techniques can be utilized to determine structures of asphaltenes, which have precipitated out of a crude oil, in an environment similar to real field conditions. A high pressure–high temperature quartz crystal microbalance (HPHT-QCM) setup can be used to detect asphaltene onset at oil production conditions. HPHT-QCM can also simulate CO2 injection conditions mimicking gas injection methods used to enhance oil recovery from depleted oil reservoirs. In this paper, we present the first compositional and structural research study on the QCM asphaltene deposits under gas injection conditions and compare it to n-C7 asphaltenes from the same crude oil precipitated in the laboratory. This study combines the use of Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), environmental scanning electron microscopy (ESEM), and energy dispersive X-ray (EDX) analysis. Furthermore, deposits collected from chemically treated fluids were also studied. The HPHT-QCM asphaltene deposits from parent crude oil are richer in oxygen species, such as the Ox and R–OH polar groups, relative to the n-C7 asphaltenes. The results of this study provide high-pressure information that leads to better understanding of asphaltene precipitation and deposition phenomena and could be taken into account when designing prevention strategies to avoid asphaltene problems throughout the oil production process.
LanguageEnglish
Pages8810–8818
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume57
Issue number26
Early online date12 Jun 2018
DOIs
Publication statusPublished - 5 Jul 2018

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Asphaltenes
Molecular structure
Quartz crystal microbalances
Deposits
Crude oil
Petroleum chemistry
Energy dispersive X ray analysis
Temperature
Fourier transform infrared spectroscopy
Nuclear magnetic resonance
Spectroscopy
Imaging techniques
Recovery
Scanning electron microscopy
Oxygen
Fluids
Oils

Cite this

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title = "Exploration of the difference in molecular structure of n-C7 and CO2 induced asphaltenes",
abstract = "Determination of the molecular structure of asphaltenes, especially in their native environment, is a formidable challenge in petroleum chemistry. Here we demonstrate that a combination of different spectroscopy and imaging based experimental techniques can be utilized to determine structures of asphaltenes, which have precipitated out of a crude oil, in an environment similar to real field conditions. A high pressure–high temperature quartz crystal microbalance (HPHT-QCM) setup can be used to detect asphaltene onset at oil production conditions. HPHT-QCM can also simulate CO2 injection conditions mimicking gas injection methods used to enhance oil recovery from depleted oil reservoirs. In this paper, we present the first compositional and structural research study on the QCM asphaltene deposits under gas injection conditions and compare it to n-C7 asphaltenes from the same crude oil precipitated in the laboratory. This study combines the use of Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), environmental scanning electron microscopy (ESEM), and energy dispersive X-ray (EDX) analysis. Furthermore, deposits collected from chemically treated fluids were also studied. The HPHT-QCM asphaltene deposits from parent crude oil are richer in oxygen species, such as the Ox and R–OH polar groups, relative to the n-C7 asphaltenes. The results of this study provide high-pressure information that leads to better understanding of asphaltene precipitation and deposition phenomena and could be taken into account when designing prevention strategies to avoid asphaltene problems throughout the oil production process.",
author = "Edris Joonaki and Jim Buckman and Burgass, {Rhoderick William} and {Tohidi Kalorazi}, Bahman",
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T1 - Exploration of the difference in molecular structure of n-C7 and CO2 induced asphaltenes

AU - Joonaki, Edris

AU - Buckman, Jim

AU - Burgass, Rhoderick William

AU - Tohidi Kalorazi, Bahman

PY - 2018/7/5

Y1 - 2018/7/5

N2 - Determination of the molecular structure of asphaltenes, especially in their native environment, is a formidable challenge in petroleum chemistry. Here we demonstrate that a combination of different spectroscopy and imaging based experimental techniques can be utilized to determine structures of asphaltenes, which have precipitated out of a crude oil, in an environment similar to real field conditions. A high pressure–high temperature quartz crystal microbalance (HPHT-QCM) setup can be used to detect asphaltene onset at oil production conditions. HPHT-QCM can also simulate CO2 injection conditions mimicking gas injection methods used to enhance oil recovery from depleted oil reservoirs. In this paper, we present the first compositional and structural research study on the QCM asphaltene deposits under gas injection conditions and compare it to n-C7 asphaltenes from the same crude oil precipitated in the laboratory. This study combines the use of Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), environmental scanning electron microscopy (ESEM), and energy dispersive X-ray (EDX) analysis. Furthermore, deposits collected from chemically treated fluids were also studied. The HPHT-QCM asphaltene deposits from parent crude oil are richer in oxygen species, such as the Ox and R–OH polar groups, relative to the n-C7 asphaltenes. The results of this study provide high-pressure information that leads to better understanding of asphaltene precipitation and deposition phenomena and could be taken into account when designing prevention strategies to avoid asphaltene problems throughout the oil production process.

AB - Determination of the molecular structure of asphaltenes, especially in their native environment, is a formidable challenge in petroleum chemistry. Here we demonstrate that a combination of different spectroscopy and imaging based experimental techniques can be utilized to determine structures of asphaltenes, which have precipitated out of a crude oil, in an environment similar to real field conditions. A high pressure–high temperature quartz crystal microbalance (HPHT-QCM) setup can be used to detect asphaltene onset at oil production conditions. HPHT-QCM can also simulate CO2 injection conditions mimicking gas injection methods used to enhance oil recovery from depleted oil reservoirs. In this paper, we present the first compositional and structural research study on the QCM asphaltene deposits under gas injection conditions and compare it to n-C7 asphaltenes from the same crude oil precipitated in the laboratory. This study combines the use of Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), environmental scanning electron microscopy (ESEM), and energy dispersive X-ray (EDX) analysis. Furthermore, deposits collected from chemically treated fluids were also studied. The HPHT-QCM asphaltene deposits from parent crude oil are richer in oxygen species, such as the Ox and R–OH polar groups, relative to the n-C7 asphaltenes. The results of this study provide high-pressure information that leads to better understanding of asphaltene precipitation and deposition phenomena and could be taken into account when designing prevention strategies to avoid asphaltene problems throughout the oil production process.

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