The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 2017
Filed:
Dec. 11, 2014
Zheng Yang, Hercules, CA (US);
Boqin Sun, Houston, TX (US);
Ajit Ramchandra Pradhan, Walnut Creek, CA (US);
Hussein Alboudwarej, San Ramon, CA (US);
Dengen Zhou, Sugarland, TX (US);
Zheng Yang, Hercules, CA (US);
Boqin Sun, Houston, TX (US);
Ajit Ramchandra Pradhan, Walnut Creek, CA (US);
Hussein Alboudwarej, San Ramon, CA (US);
Dengen Zhou, Sugarland, TX (US);
Chevron U.S.A. Inc., San Ramon, CA (US);
Abstract
A method for determining the concentration of asphaltenes in a solution is described. A model is first established for estimating the concentration of asphaltenes in a solution based on multiple samples of solutions of asphaltenes in the solvent in which the concentrations are known. The multiple samples have varying concentrations of asphaltenes. The diffusivity and relaxation time are measured for each sample using two-dimensional NMR. The ratio of diffusivity to relaxation time for each sample is then calculated. A linear equation is determined to fit the relationship between the ratio of diffusivity to relaxation time and the asphaltene concentration by weight for the multiple samples, thus creating the model. For a given solution sample for which the concentration of asphaltenes is desired to be determined, diffusivity and relaxation time are determined using two-dimensional NMR, and the ratio of diffusivity to relaxation time is calculated. This ratio is then used with the model, so that the linear equation can be solved for the asphaltene concentration in the given solution sample.