Characterization of an api gravity value of crude oil by ultraviolet visible spectroscopy

Patent metadata

Field	Value
Publication number	US-2016377589-A1
Application number	US-201615235680-A
Country	US
Kind code	A1
Filing date	Aug 12, 2016
Priority date	Feb 22, 2011
Publication date	Dec 29, 2016
Grant date	—

Abstract

A system and a method for characterizing a crude oil sample from the weight and ultraviolet visible spectroscopy of the sample, including calculating and assigning a crude oil ultraviolet visible index and using the assigned index to calculate and assign an API gravity and/or to calculate and assign an aromaticity value of the sample.

First claim

1 . A system for characterizing an API gravity value of an oil sample based upon ultraviolet visible spectroscopy data derived from the sample, the system comprising:
a non-volatile memory device that stores calculation modules and data, the data including ultraviolet visible spectroscopy data indicative of absorbance values over a range of wavelengths; a processor coupled to the memory; a first calculation module that calculates and assigns an index value for the oil sample based upon the ultraviolet visible spectroscopy data; and a second calculation module that calculates and assigns the API gravity value of the oil sample based upon the assigned index value.

2 . A system for characterizing an API gravity value of an oil sample comprising:
an ultraviolet visible spectrometer that outputs ultraviolet visible spectroscopy data derived from the oil sample, a non-volatile memory device that stores calculation modules and data, the data including outputted ultraviolet visible spectroscopy data indicative of absorbance values over a range of wavelengths; a processor coupled to the memory; a first calculation module that calculates and assigns an index value for the oil sample based upon the ultraviolet visible spectroscopy data; and a second calculation module that calculates and assigns the API gravity value of the oil sample based upon the assigned index value.

3 - 5 . (canceled)

6 . A method for operating a computer to characterize an API gravity value of an oil sample based upon ultraviolet visible spectroscopy data, the method comprising:
entering into the computer ultraviolet visible spectroscopy data indicative of absorbance values over a range of wavelengths; calculating and assigning an index value of the oil sample based upon ultraviolet visible spectroscopy data; and calculating and assigning an API gravity value of the sample from the assigned index value.

7 . A method for operating a computer to characterize an API gravity value of an oil sample comprising:
operating an ultraviolet visible spectrometer that to obtain ultraviolet visible spectroscopy data derived from the oil sample; entering into the computer the ultraviolet visible spectroscopy data, the data indicative of absorbance values over a range of wavelengths; calculating and assigning an index value of the oil sample based upon ultraviolet visible spectroscopy data; and calculating and assigning the API gravity value of the sample from the assigned index value.

8 - 30 . (canceled)

31 . The system of claim 1 wherein the ultraviolet visible spectroscopy data is obtained by ultraviolet visible spectroscopy analysis is in a wavelength range from 220-500 nm.

32 . The system of claim 31 , wherein the ultraviolet visible spectroscopy data is obtained from an ultraviolet visible spectroscopy analysis in a wavelength range from 220-400 nm.

33 . The system of claim 1 , further comprising a third calculation module that calculates and assigns a classification to the oil sample based upon the assigned API gravity value.

34 . The system of claim 1 , further comprising a third calculation module that calculates and assigns an aromaticity value to the oil sample based upon the index value.

35 . The system of claim 1 , wherein the first calculation module calculates and assigns the index value based upon the ultraviolet visible spectroscopy data and a mass of the oil sample.

36 . The system of claim 35 , further comprising a third calculation module that calculates and assigns a classification to the oil sample based upon the assigned API gravity value.

37 . The system of claim 35 , further comprising a third calculation module that calculates and assigns an aromaticity value to the oil sample based upon the index value.

38 . The system of claim 2 wherein the ultraviolet visible spectroscopy data is obtained by ultraviolet visible spectroscopy analysis is in a wavelength range from 220-500 nm.

39 . The system of claim 38 , wherein the ultraviolet visible spectroscopy data is obtained from an ultraviolet visible spectroscopy analysis in a wavelength range from 220-400 nm.

40 . The system of claim 2 , further comprising a third calculation module that calculates and assigns a classification to the oil sample based upon the assigned API gravity value.

41 . The system of claim 2 , further comprising a third calculation module that calculates and assigns an aromaticity value to the oil sample based upon the index value.

42 . The system of claim 2 , wherein the first calculation module calculates and assigns the index value based upon the ultraviolet visible spectroscopy data and a mass of the oil sample.

43 . The system of claim 42 , further comprising a third calculation module that calculates and assigns a classification to the oil sample based upon the assigned API gravity value.

44 . The system of claim 42 , further comprising a third calculation module that calculates and assigns an aromaticity value to the oil sample based upon the index value.

45 . The method of claim 6 , wherein the ultraviolet visible spectroscopy data is obtained by ultraviolet visible spectroscopy analysis is in a wavelength range from 220-500 nm.

46 . The method of claim 45 , wherein the ultraviolet visible spectroscopy data is obtained from an ultraviolet visible spectroscopy analysis in a wavelength range from 220-400 nm.

47 . The method of claim 6 , further comprising calculating and assigning a classification to the oil sample from the assigned API gravity value.

48 . The method of claim 6 , further comprising calculating and assigning an aromaticity value to the oil sample based upon the index value.

49 . The method of claim 6 , further comprising weighing the sample to obtain a mass, and wherein calculating and assigning the index value is based upon the ultraviolet visible spectroscopy data and the mass of the oil sample.

50 . The method of claim 49 , further comprising calculating and assigning a classification to the oil sample from the assigned API gravity value.

51 . The method of claim 49 , further comprising calculating and assigning an aromaticity value to the oil sample based upon the index value.

52 . The method of claim 7 , wherein the ultraviolet visible spectroscopy data is obtained by ultraviolet visible spectroscopy analysis is in a wavelength range from 220-500 nm.

53 . The method of claim 52 , wherein the ultraviolet visible spectroscopy data is obtained from an ultraviolet visible spectroscopy analysis in a wavelength range from 220-400 nm.

54 . The method of claim 7 , further comprising calculating and assigning a classification to the oil sample from the assigned API gravity value.

55 . The method of claim 7 , further comprising calculating and assigning an aromaticity value to the oil sample based upon the index value.

56 . The method of claim 7 , further comprising weighing the sample to obtain a mass, and wherein calculating and assigning the index value is based upon the ultraviolet visible spectroscopy data and the mass of the oil sample.

57 . The method of claim 56 , further comprising calculating and assigning a classification to the oil sample from the assigned API gravity value.

58 . The method of claim 56 ,

Assignees

• Saudi Arabian Oil Co

Inventors

• Koseoglu Omer Refa
• Al-Hajji Adnan
• Jamieson Gordon

Classifications

• G01N2201/061

  Sources · CPC title

• G01N1/38

  Diluting, dispersing or mixing samples · CPC title

• G01N21/33

  using ultraviolet light (G01N21/39 takes precedence) · CPC title

• G01N33/2823 Primary

  Raw oil, drilling fluid or polyphasic mixtures · CPC title