Flow testing wellbores while drilling

A downhole well testing tool comprising:

• an uphole packer positioned at an uphole end of the tool;
• a downhole packer positioned at a downhole end of the tool;
• one or more sensors positioned between the uphole packer and the downhole packer;
• and
• a three-way valve positioned between the uphole and downhole packer, the three-way valve comprising:
• a ball valve positioned within a central flow path of the well testing tool;
• and
• a retractable sleeve positioned downhole of the ball valve, the sleeve surrounding a plurality of fluid ports.

A drill string comprising:

• a drill bit at a downhole end of the drill string;
• a downhole well testing tool uphole of the drill bit, the downhole well testing tool comprising:
• an uphole packer positioned at an uphole end of the tool;
• a downhole packer positioned at a downhole end of the tool;
• one or more sensors positioned between the uphole packer and the downhole packer;
• a three-way valve positioned between the uphole and downhole packer, the three-way valve configurable to be in three valve states, the three-way valve comprising:
• a ball valve positioned within a central flow path of the well testing tool;
• and
• a retractable sleeve positioned downhole of the ball valve, the sleeve surrounding a plurality of fluid ports;
• and
• an upper circulation valve positioned uphole of the uphole packer, the upper circulation valve configurable to be in an open or closed state;
• and
• a controller comprising:
• one or more processors;
• and
• a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming instructions for execution by the one or more processors, the programming instructions instruct the one or more processors to:
• detect a first weighted RFID tag;
• set a state of the uphole packer and the downhole packer in response to the detected RFID tag;
• and
• set a mode of the three-way valve, wherein the mode of the three-way valve is changed in response to a presence of a second RFID tag different than the first RFID tag.