Determining oil and water production rates in multiple production zones from a single production well

A system comprising:

• production tubing arranged to receive production fluid from a first production zone and a second production zone in a production well;
• a first subsurface control valve regulating flow from the first production zone into the production tubing;
• a second subsurface control valve regulating flow from the second production zone into the production tubing;
• a first actuatable injection tube with a first outlet adjacent to a first inlet of the production tubing within the first production zone;
• a second actuatable injection tube with a second outlet adjacent to a second inlet of the production tubing within the second production zone;
• and
• a real-time sensor at a topside facility;
• and
• a controller configured to:
• send a control signal to a first topside pressure pump, the control signal configured to cause the pump to pulse a first tracer into the first production zone;
• send a control signal to a second topside pressure pump, the control signal configured to cause the pump to pulse 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;
• measure a first tracer decay at a topside facility by the real-time sensor;
• measure a second tracer decay at the topside facility by the real-time sensor;
• 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;
• send a control signal to the first subsurface control valve, the signal configured to actuate a first subsurface control valve to regulate the production fluids from the first production zone;
• and
• send a control signal to the second subsurface control valve, the signal configured to actuate a second subsurface control valve to regulate the production fluids from the second production zone.

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;
• determining a water cut of the first production zone and the second production zone based upon the first tracer decay and the second tracer decay;
• actuating a first subsurface control valve, responsive to determining the water cut of the first production zone and the second production zone, to regulate the production fluids from the first production zone;
• and
• actuating a second subsurface control valve, responsive to determining the water cut of the first production zone and the second production zone, to regulate the production fluids from the second production zone.