controlling a first process using a first process control system, the first process comprising a natural gas liquids (NGL) production process, the first process supplying at least one pipeline;

controlling a second process using a second process control system, the second process comprising a liquefied natural gas (LNG) production process, the second process fed from the at least one pipeline; and

controlling the first and second process control systems together so as to optimize at least one process objective using both the first and second process control systems, wherein controlling the first and second process control systems comprises maintaining a pressure within the at least one pipeline at a desired level, wherein maintaining the pressure comprises adjusting at least one of multiple valves for at least one of multiple wells associated with a hydrocarbon reservoir, the wells feeding the NGL production process.