Characterization of crude oil by ultraviolet visible spectroscopy
AssigneeSaudi Arabian Oil Company
InventorsOmer Refa KOSEOGLU, Adnan Al-Hajji, Gordon Jamieson
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Abstract
A system and a method for characterizing a crude oil sample from the weight and ultraviolet visible spectroscopy of the sample, including calculating a crude oil ultraviolet visible index and using the index to calculate the API gravity and the aromaticity of the sample.
Claims18
A system for characterizing the API gravity of a sample of crude oil based upon ultraviolet visible spectroscopy data derived from the sample and the weight of the sample, the system comprising:
- a non-volatile memory device that stores calculation modules and data;
- a processor coupled to the memory;
- a first calculation module that calculates a crude oil ultraviolet visible index value for the sample based on the sample's weight and the absorbance values of the spectroscopy data;
- and a second calculation module that characterizes the API gravity of the sample based on the crude oil ultraviolet visible index.
A system for characterizing the API gravity of a sample of crude oil based upon separately provided ultraviolet visible spectroscopy data of the sample and a separately provided weight of the sample, the system comprising:
- a non-volatile memory device that stores calculation modules and data;
- a processor coupled to the memory;
- a first calculation module that calculates a crude oil ultraviolet visible index of the sample from the sample's weight and from the absorbance values of the spectroscopy data;
- a second calculation module that calculates an estimated API gravity of the sample based on the crude oil ultraviolet visible index;
- and a third calculation module that calculates a classification value for the sample from the estimated API gravity.
A method for operating a computer to characterize the API gravity of a sample of a hydrocarbon oil collected from an oil well, stabilizer, extractor, or distillation tower, the method comprising:
- weighing the sample;
- preparing the sample for ultraviolet visible spectroscopy analysis by diluting the sample with solvents;
- obtaining ultraviolet visible spectroscopy data from an ultraviolet visible spectroscopy analysis in a wavelength range from 220-500 nm;
- entering into the computer spectra data obtained by ultraviolet visible spectroscopy analysis of the sample;
- calculating an ultraviolet visible index of the sample from the weight of the sample and from the ultraviolet visible index spectroscopy data;
- and calculating the API gravity of the sample from the ultraviolet visible index.
A method for operating a computer to characterize the API gravity of a sample of oil collected from an oil well, stabilizer, extractor, or distillation tower, the method comprising:
- weighing the sample;
- preparing the sample for ultraviolet visible spectroscopy analysis by diluting the sample with solvents;
- obtaining spectra data for the sample by an ultraviolet visible spectroscopy analysis in a wavelength range from 220-500 nm;
- entering into the computer the spectra data for the sample;
- calculating an ultraviolet visible index of the sample based on the weight of the sample and the spectra data;
- calculating an estimated API gravity from the ultraviolet visible index;
- and classifying the sample from the estimated API gravity.
A system for characterizing a sample of crude oil based upon ultraviolet visible spectroscopy data for the sample and the weight of the sample, the system comprising:
- a non-volatilememory that stores calculation modules and data;
- a processor coupled to the memory;
- a first calculation module that calculates a crude oil ultraviolet visible index of the sample based on the sample's weight and the absorbance values of the spectroscopy data;
- and a second calculation module that calculates the aromaticity of the sample from the crude oil ultraviolet visible index.
A system for characterizing a sample of crude oil based upon ultraviolet visible spectroscopy data for the sample and the weight of the sample, the system comprising:
- a non-volatile memory that stores calculation modules and data;
- a processor coupled to the memory;
- a first calculation module that calculates a crude oil ultraviolet visible index of the sample from the sample's weight and from the absorbance values of the spectroscopy data;
- a second calculation module that estimates the API gravity of the sample from the crude oil ultraviolet visible index.
- and a third calculation module that calculates the aromaticity of the sample from the crude oil ultraviolet visible index.
A method for operating a computer to characterize a sample of crude hydrocarbon oil collected from an oil well, stabilizer, extractor, or distillation tower, the method comprising:
- weighing the sample;
- preparing the sample for ultraviolet visible spectroscopy analysis by diluting the sample with at least one paraffinic solvent and at least one polar solvent;
- obtaining ultraviolet visible spectroscopic spectra data from an ultraviolet visible spectroscopy analysis in a wavelength range from 220-500 nm;
- entering into the computer the spectra data obtained for the sample;
- calculating an ultraviolet visible index of the sample based on the weight and the spectra data;
- characterizing the gravity of the sample from the ultraviolet visible index;
- and
- calculating the aromaticity of the sample from the ultraviolet visible index.
Dependencies are inferred from the claim text.