Method to prepare virtual assay using near infrared spectroscopy
AssigneeSaudi Arabian Oil Company
InventorOmer Refa KOSEOGLU
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Abstract
Systems and methods are disclosed for providing virtual assays of an oil sample such as crude oil based on near infrared (NIR) spectroscopy carried out on the oil sample, and the density of the oil sample. The virtual assay provides a full range of information about fractions of the oil sample including naphtha, gas oil, vacuum gas oil, vacuum residue, and other information about the properties of the oil sample. Using the system and method herein, the virtual assay data pertaining to these several fractions of the oil sample and the oil sample itself are obtained without the need to fractionate the oil sample into the several components.
Claims21
A method for producing a virtual assay of an oil sample, wherein the oil sample is characterized by a density, selected from the group consisting of crude oil, bitumen and shale oil, and characterized by naphtha, gas oil, vacuum gas oil and vacuum residue fractions, the method comprising:
- entering into a computer near infrared (NIR) spectroscopy data indicative of absorbance values of the oil sample over a predetermined wavenumber range obtained by analysis of the oil sample without distillation;
- calculating and assigning an analytical value (AV) as a function of the NIR spectroscopy data;
- and
- calculating and assigning, as a function of the AV and the density of the oil sample, virtual assay data of the oil sample and the naphtha, gas oil, vacuum gas oil and vacuum residue fractions, said virtual assay data comprising a plurality of assigned data values.
(canceled)
A system for producing a virtual assay of an oil sample, wherein the oil sample is characterized by a density, selected from the group consisting of crude oil, bitumen and shale oil, and characterized by naphtha, gas oil, vacuum gas oil and vacuum residue fractions, the system comprising:
- a near infrared (MR) spectrometer that outputs near infrared spectroscopy data;
- a non-volatile memory device that stores calculation modules and data, the data including the NIR spectroscopy data, wherein the NIR spectroscopy data is indicative of absorbance values of the oil sample over a predetermined wavenumber range obtained by analysis of the oil sample without distillation;
- a processor coupled to the non-volatile memory device;
- a first calculation module that is stored in the non-volatile memory device and that is executed by the processor, wherein the first calculation module calculates an analytical value (AV) as a function of the NIR spectroscopy data;
- and
- a second calculation module that is stored in the non-volatile memory device and that is executed by the processor, wherein the second calculation module calculates, as a function of the AV and the density of the oil sample, virtual assay data of the oil sample and the naphtha, gas oil, vacuum gas oil and vacuum residue fractions, said virtual assay data comprising a plurality of assigned data values.
Dependencies are inferred from the claim text.