Method and system for converting associated gas

A gas conversion system to form a product gas from an associated gas stream, the gas conversion system comprising:

• a separator configured to receive and separate a primary feed gas containing methane and non-methane hydrocarbons into (i) primarily natural gas liquids (NGL) gas stream containing primarily non-methane hydrocarbons and lesser amounts of methane as an associated gas stream and (ii) a methane-rich gas stream containing primarily methane and lesser amounts of non-methane hydrocarbons;
• a steam generator configured to receive system water and to output steam;
• a mixing valve system configured (a) to receive the steam and the associated gas stream which is the primarily NGL gas stream from the separator, (b) to flow control at least a portion of the associated gas stream and the steam, and (c) to output a feed gas which is a mixture of the steam and the at least a portion of the associated gas stream;
• a super heater configured to receive the feed gas and to superheat the feed gas to a predetermined temperature range to form a superheated feed gas;
• a heavy hydrocarbon reactor containing a first catalyst having a leading edge and configured to receive the superheated feed gas onto the leading edge and to crack a portion of the non-methane hydrocarbons of the superheated feed gas into carbon oxides and hydrogen to form a heavy hydrocarbon reactor reformate comprising methane from the associated gas stream, the carbon oxides, and the hydrogen;
• a synthetic natural gas generator containing a second catalyst configured to receive the heavy hydrocarbon reactor reformate to convert a portion of the carbon oxides and the hydrogen into converted methane to form a synthetic natural wet processed gas as a product gas, the synthetic natural wet processed gas containing the methane from the associated gas stream and the converted methane, wherein the synthetic natural wet processed gas has an overall higher methane mole fraction than the associated gas stream;
• and
• an enrichment mixing valve system configured to mix an enrichment percentage of at least a portion of the methane-rich gas stream from the separator with the product gas in a ratio that creates a second product gas stream with predetermined target values for at least one of methane number, energy density, heating value, and composition.