US 12,442,289 B2
Oil, gas and water well tracers with tunable release profile
Rajesh Kumar Saini, Cypress, TX (US); Amy J. Cairns, Houston, TX (US); Shitong Sherry Zhu, Waban, MA (US); Ayrat Gizzatov, Winchester, MA (US); Wei Wang, Fremont, CA (US); Mohammed Sayed, Katy, TX (US); and Hooisweng Ow, Woburn, MA (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on May 31, 2024, as Appl. No. 18/680,320.
Application 18/680,320 is a division of application No. 17/815,393, filed on Jul. 27, 2022, granted, now 12,037,893.
Prior Publication US 2024/0318545 A1, Sep. 26, 2024
Int. Cl. E21B 47/11 (2012.01); E21B 43/26 (2006.01)
CPC E21B 47/11 (2020.05) [E21B 43/26 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method comprising:
injecting a fluoro-based molecule tracer and a nonreactive tracer into a first well in a subterranean formation;
maintaining the fluoro-based molecule tracer and the nonreactive tracer in the subterranean formation for an amount of time, during which the fluoro-based molecule tracer comes into contact with water at a downhole temperature, wherein the water at the downhole temperature hydrolyzes bonds of the fluoro-based molecule tracer to provide a fluorinated tracer and a nonfluorinated group, wherein the fluorinated tracer is different from the nonreactive tracer;
producing a hydrocarbon fluid at a second well;
analyzing the hydrocarbon fluid for a presence of the fluorinated tracer, the fluoro-based molecule tracer, and the nonreactive tracer; and
determining a residual oil saturation of a location of the subterranean formation based on the presence of the fluorinated tracer, the fluoro-based molecule tracer, and the nonreactive tracer in the hydrocarbon fluid.