Modular gas detection system for a wellbore

A method comprising:

• detecting, by a controller of a modular gas detection system, modules communicatively coupled to the controller;
• controlling, by the controller of the modular gas detection system, routing of a gas sample to the modules of the modular gas detection system;
• adjusting, by the controller of the modular gas detection system, a detection scheme of a primary gas chromatograph of the modular gas detection system to update a detection range for a continuous fluid sample to detect different hydrocarbons within a single column;
• receiving, by the controller of the modular gas detection system, data generated by the modules of the modular gas detection system;
• and
• reporting results, by the controller of the modular gas detection system, to an entity.

A non-transitory computer-readable medium comprising instructions that are executable by a processing device for causing the processing device to:

• detect modules communicatively coupled to a controller of a modular gas detection system;
• control routing of a gas sample to the modules of the modular gas detection system;
• adjust a detection scheme of a primary gas chromatograph of the modular gas detection system to update a detection range for a continuous fluid sample to detect different hydrocarbons within a single column;
• receive data generated by the modules of the modular gas detection system;
• and
• control drilling or completion operations based on the data generated by the modules.