Methods to use chemo-resistive sensors for wellbore production

A non-transitory computer-readable medium comprising instructions that are configured, when executed by a processor, to:

• divert a sample of a portion of the fluid from a main conduit into a diverting conduit through a first set of valves with a test chamber disposed between the first set of valves, wherein the test chamber comprises a piston disposed vertically above a central axis of the diverting conduit, a heat source disposed around the test chamber, and one or more electro-chemical resistor sensors, wherein the piston is in a first position;
• actuating the first set of valves to close after the test chamber receives the sample of the portion of the fluid while the piston is in the first position;
• moving the piston to a second position;
• actuate the heat source to increase the temperature within the test chamber to produce vapors from the sample of the portion of the fluid after the piston is in the second position;
• direct the vapors from the sample of the portion of the fluid to the one or more electro-chemical sensors;
• and
• determine a composition of the vapors from the sample of portion of the fluid, wherein the composition of the vapors is associated with the composition of the fluid.

A method for measurement of the composition of a fluid, comprising:

• actuating a first set of valves to an open position;
• diverting a sample of a portion of the fluid from a main conduit into a diverting conduit in a chemical sensor system, wherein the chemical sensor system comprises the first set of valves, a piston disposed vertically above a central axis of the diverting conduit, a heat source disposed around a test chamber, one or more electro-chemical resistor sensors, a secondary conduit disposed vertically above the diverting conduit and operable to facilitate a flow of a secondary fluid during a purging cycle controlled by a second set of valves in a closed position before measurement, wherein the piston is in a first position;
• actuating the first set of valves to a closed position;
• moving the piston to a second position;
• actuating the heat source to increase the temperature within the test chamber to produce vapors from the sample of the portion of the fluid;
• opening one of the valves of the second set of valves located after the one or more electro-chemical sensors;
• directing the vapors from the sample of the portion of the fluid to a chemical sensor array comprising one or more electro-chemical sensors;
• determining a composition of the vapors from the sample of portion of the fluid, wherein the composition of the vapors is associated with the composition of the fluid;
• opening one of the valves of the first set of valves located after the piston;
• moving the piston to the first position;
• opening the second valve of the second set of valves located before the piston;
• and
• closing the second set of valves.