Characterization of crude oil by near infrared spectroscopy
OwnerOmer Refa Koseoglu, Adnan Al-Hajji +1inventors
InventorsOmer Refa Koseoglu, Adnan Al-Hajji, Anaam Al-Shaikh Ali
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Abstract
A system and a method for calculating the cetane number, pour point, cloud point and aniline point of a gas oil fraction of a crude oil from the density and near infrared spectroscopy of a sample of the crude oil.
Claims16
A system for evaluating a crude oil sample and calculating indicative properties of a gas oil fraction of the crude oil without first distilling the gas oil fraction from the crude oil, the system comprising:
- a near infrared spectrometer;
- a non-volatile memory device that stores calculation modules and data;
- a processor coupled to the non-volatile memory;
- a first calculation module that calculates a near infrared absorbance index from a summation of near infrared spectroscopy absorbance values of the crude oil for peaks detected at a predetermined series of wavenumbers;
- a second calculation module that derives the cetane number for the gas oil fraction as a function of the near infrared absorbance index and density of the sample;
- a third calculation module that derives the pour point for the gas oil fraction as a function of the near infrared absorbance index and density of the sample;
- a fourth calculation module that derives the cloud point for the gas oil fraction as a function of the near infrared absorbance index and density of the sample;
- and
- a fifth calculation module that derives the aniline point for the gas oil fraction as a function of the near infrared absorbance index and density of the sample.
A method for evaluating a crude oil sample and calculating indicative properties, the method comprising:
- determining the density of the crude oil sample;
- subjecting said crude oil sample to near infrared spectroscopy analysis;
- calculating a near infrared absorbance index from a summation of near infrared spectroscopy spectra data absorbance values of the crude oil sample for peaks detected at a predetermined series of wavenumbers;
- calculating a cetane number as a function of the near infrared absorbance and density of the sample;
- calculating pour point as a function of the near infrared absorbance and density of the sample;
- calculating a cloud point as a function of the near infrared absorbance and density of the sample;
- and
- calculating an aniline point as a function of the near infrared absorbance and the density of the sample.
A system for evaluating a crude oil sample and determining an indicative property, the system comprising:
- a near infrared spectrometer;
- a non-volatile memory device that stores calculation modules and data, the data including density of the crude oil sample and near infrared spectroscopy absorbance values obtained from the near infrared spectrometer;
- a processor coupled to the non-volatile memory;
- a first calculation module that calculates a near infrared absorbance index from a summation of near infrared spectroscopy absorbance values of the crude oil for peaks detected at a predetermined series of wavenumbers;
- and
- a second calculation module that calculates the indicative property as a function of the near infrared absorbance index and the density of the sample.
A method for evaluating a crude oil sample and calculating an indicative property, the method comprising:
- determining the density of the crude oil sample;
- subjecting the crude oil sample to near infrared spectroscopy analysis;
- calculating a near infrared absorbance index from a summation of near infrared spectroscopy spectra absorbance values of the crude oil sample for peaks detected at a predetermined series of wavenumbers;
- and
- calculating and recording the indicative property as a function of the near infrared absorbance index and the density of the sample.
Dependencies are inferred from the claim text.