US 12,000,278 B2
Determining oil and water production rates in multiple production zones from a single production well
Hsieh Chen, Cambridge, MA (US); Martin E. Poitzsch, Northumberland, NH (US); Hooisweng Ow, Woburn, MA (US); and Ivan Cetkovic, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Dec. 16, 2021, as Appl. No. 17/644,641.
Prior Publication US 2023/0193755 A1, Jun. 22, 2023
Int. Cl. E21B 49/08 (2006.01); E21B 34/06 (2006.01); E21B 43/12 (2006.01); E21B 47/11 (2012.01)
CPC E21B 49/0875 (2020.05) [E21B 34/06 (2013.01); E21B 43/12 (2013.01); E21B 47/11 (2020.05)] 19 Claims
OG exemplary drawing
 
1. A method comprising:
producing from a wellbore that supplies production fluid from a first production zone and a second production zone, production fluids from the first and second production zone being comingled within a same production tubular;
pulsing a first tracer into the first production zone;
pulsing a second tracer into the second production zone, the first tracer and the second tracer being barcoded such that the first tracer and the second tracer can be differentiated from one another;
measuring a first tracer decay at a topside facility;
measuring a second tracer decay at the topside facility; and
determine a water cut of the first production zone and the second production zone based upon the first tracer decay and the second tracer decay.