Systems and methods for power generation in a combined cycle utilizing a geobaric expander and a combustion turbine

A system for generating power from a high-pressure gas stream received from a wellhead, the system comprising:a plurality of combined-cycle power generation modules arranged in series, each combined-cycle power generation module comprising:a combustion engine configured to generate power and exhaust gas;a heat exchanger configured to receive the high-pressure gas stream and the exhaust gas from the combustion engine and to transfer heat from the exhaust gas to the high- pressure gas stream;

• andan expander configured to receive the high-pressure gas stream from the heat exchanger and to expand the high-pressure gas stream to a lower pressure;wherein each combined-cycle power generation module has a respective design inlet pressure;
• andwherein the system is configured to bypass a combined-cycle power generation module when the wellhead pressure falls below a design inlet pressure of said combined-cycle power generation module, and direct the high-pressure gas stream from the wellhead to a next combined-cycle power generation module in the series having a lower design inlet pressure.

A method for generating power from a high-pressure gas stream received from a wellhead, the method comprising:receiving, by a plurality of combined-cycle power generation modules arranged in series, the high-pressure gas stream from the wellhead, each combined-cycle power generation module comprising a combustion engine, a heat exchanger, and an expander;generating power at each active combined-cycle power generation module of the plurality of combined-cycle power generation modules by:operating the combustion engine to generate exhaust gas;transferring heat from the exhaust gas to the high-pressure gas stream via the heat exchanger to produce a heated high-pressure gas stream;

• andexpanding the heated high-pressure gas stream via the expander to reduce a pressure of the heated high-pressure gas stream;
• andautomatically bypassing a combined-cycle power generation module when the wellhead pressure falls below a design inlet pressure of said combined-cycle power generation module, and automatically directing the high-pressure gas stream from the wellhead to a next combined- cycle power generation module in the series having a lower design inlet pressure.