Methods for generating geothermal power in an organic Rankine cycle operation during hydrocarbon production based on wellhead fluid temperature

A method for generating geothermal power in an organic Rankin cycle operation in the vicinity of a wellhead during hydrocarbon production to thereby supply electrical power to one or more of in-field operational equipment, a grid power structure, and an energy storage device, the method comprising:

• connecting one or more high-pressure heat exchangers to a wellhead fluid flow line of one or more wellheads at a well thereby defining a fluid path from the wellhead fluid flow line of one or more wellheads through the one or more high pressure heat exchangers;
• connecting one or more ORC units to the one or more high-pressure heat exchangers;
• during hydrocarbon production at one or more of the one or more wellheads, determining, based on feedback from one or more temperature sensors corresponding to a flow of one or more wellhead fluids entering the high-pressure heat exchanger, a temperature of flow of the one or more wellhead fluids from the one or more wellheads;
• and
• in response to a determination that the temperature is above a vaporous phase change threshold of a working fluid, opening one or more heat exchanger valves to divert the flow of the one or more wellhead fluids to the one or more high-pressure heat exchangers to facilitate transfer of heat from the flow of the one or more wellheads fluid to the working fluid through the high-pressure heat exchanger, thereby to change phases of the working fluid from a liquid to a vapor within the one or more heat exchangers so as to cause a gas expander, in fluid communication with the one or more heat exchangers, to rotate a generator to generate electrical power from the ORC operation.