Zonal Compositional Production Rates in Commingled Gas Wells

A method, comprising:

• conveying a production logging tool (PLT) within production tubing containing production fluid flow established by zonal fluid flow into the production tubing from zones of a subterranean formation through which the production tubing extends;
• operating the PLT to measure a flow rate of the production fluid flow at each of a plurality of depths associated with a corresponding one of the zones;
• determining a flow rate of the zonal fluid flow from each of the zones based on the flow rates of the production fluid flow measured at each of the zone-associated depths;
• positioning the PLT adjacent one of the zones and then varying a drawdown pressure while:
• operating the PLT to measure proportions of compositional components of the production fluid flow at the PLT-adjacent zone-associated depth;
• and
• determining a flow rate of each compositional component of the zonal fluid flow from the PLT-adjacent zone based on:
• the determined flow rate of the zonal fluid flow from the PLT-adjacent zone;
• and
• the proportions of compositional components of the production fluid flow measured at the PLT-adjacent zone-associated depth;
• and
• assessing condensate banking within the PLT-adjacent zone based on the determined flow rate of each compositional component of the zonal fluid flow from the PLT-adjacent zone.

An apparatus, comprising:

• a tool operable to be conveyed within tubing containing fluid flow established by zonal fluid flow into the tubing from zones of a subterranean formation through which the tubing extends, wherein the tool comprises:
• a flow module operable to measure a flow rate of the fluid flow at each of a plurality of depths associated with a corresponding one of the zones;
• and
• a sensor operable to measure proportions of compositional components of the fluid flow at each of the zone-associated depths;
• and
• a controller operable to:
• determine a flow rate of the zonal fluid flow from each of the zones based on the flow rates of the fluid flow measured at each of the zone-associated depths;
• and
• determine a flow rate of each compositional component of the zonal fluid flow from each of the zones based on:
• the determined flow rate of the zonal fluid flow from each of the zones;
• and
• the proportions of compositional components of the fluid flow measured at each of the zone-associated depths.