US 12,281,572 B1
Determining hydrocarbon production from multiple subterranean formations
Qasim Sahu, Sayhat (SA); Rajendra Arunkumar Kalgaonkar, Dhahran (SA); and Vera Solovyeva, Moscow (RU)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Oct. 2, 2023, as Appl. No. 18/479,204.
Int. Cl. E21B 49/08 (2006.01); E21B 47/11 (2012.01)
CPC E21B 49/088 (2013.01) [E21B 47/11 (2020.05)] 18 Claims
OG exemplary drawing
 
1. A method comprising:
sequentially injecting a plurality of different nanotag tracers into a plurality of subterranean production zones fluidly coupled to a wellbore extending from a surface of the Earth through the plurality of subterranean production zones, each of the respective nanotag tracers injected into a respective subterranean production zone;
producing the different nanotag tracers and production fluids contained within the subterranean production zones through the wellbore to the surface;
determining, at the surface, a turbidity of the production fluids containing the different nanotag tracers;
determining, at the surface, a quantity of each of the one or more different nanotag tracers from each of the plurality of subterranean production zones in the production fluids; and
determining, based on the turbidity of the production fluids and the quantity of each of the one or more different nanotag tracers, a total oil production rate from the plurality of subterranean production zones by training a dataset of solutions with various turbidities relative to total oil production rates and expected quantities of each of the one or more different nanotag tracers, wherein the turbidity of the production fluids is proportional to the total oil production rate from the subterranean production zones.