US 12,404,754 B2
Method of measurement of interfacial tension (IFT) of two immiscible fluids at reservoir conditions: an in situ gas buffered injection
Salah Hamad Al-Saleh, Dhahran (SA); Ahmed Gmira, Al-Khobar (SA); and Ali Abdallah Al-Yousef, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Mar. 10, 2023, as Appl. No. 18/181,694.
Application 18/181,694 is a division of application No. 16/892,620, filed on Jun. 4, 2020, granted, now 11,649,708.
Prior Publication US 2023/0279754 A1, Sep. 7, 2023
Int. Cl. G01N 13/02 (2006.01); E21B 43/20 (2006.01)
CPC E21B 43/20 (2013.01) [G01N 13/02 (2013.01); G01N 2013/0241 (2013.01); G01N 2013/0275 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for determining interfacial tension of a hydrocarbon in a brine fluid, comprising:
injecting a first brine fluid into a test cell, the first brine fluid having an initial ionic composition;
injecting a hydrocarbon fluid into the test cell;
contacting the hydrocarbon fluid with the first brine fluid, forming a droplet;
measuring the interfacial tension of the hydrocarbon fluid in contact with the first brine fluid;
at least partially displacing the first brine fluid with an inert gas;
measuring a ionic composition of the displaced first brine fluid in an ionic chromatograph; and
comparing the measured ionic composition to the initial ionic composition.