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:
Mar. 14, 2023
Filed:
Sep. 26, 2018
Applicant:
Schlumberger Technology Corporation, Sugar Land, TX (US);
Inventors:
Matthew T. Sullivan, Westwood, MA (US);
Christopher Harrison, Auburndale, MA (US);
Elizabeth Jennings Smythe, Cambridge, MA (US);
Assignee:
SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 49/08 (2006.01); E21B 47/06 (2012.01); E21B 49/10 (2006.01); G01N 33/28 (2006.01); G01N 21/3577 (2014.01); G01N 15/00 (2006.01);
U.S. Cl.
CPC ...
E21B 49/0875 (2020.05); E21B 47/06 (2013.01); E21B 49/088 (2013.01); E21B 49/10 (2013.01); G01N 21/3577 (2013.01); G01N 33/2823 (2013.01); G01N 2015/0092 (2013.01);
Abstract
Asphaltene onset pressure of a formation fluid is determined by subjecting the fluid to a plurality of tests where depressurization is conducted at a different depressurization rate for each test while optically monitoring the fluid for asphaltene flocculation. The pressures at which asphaltene flocculation are detected in each test are fit to a curve as a function of depressurization rate, and the curve is extrapolated to a pressure (e.g., 0 psi) to provide the asphaltene onset pressure.