The chemical engineers works in very different kind of industries. Of course Gas&Oil sector has a great demand but is not the only one.
In South America, lot of Chemical Engineers works in food industries. Some of them in minning or plastics, or rubber or any of those industries. Environmental engineering is also an important field. There we can design and operate wastewater and exhaust gases treatment plants, and also work in the industrial process to improve the environmental performance.
In academic field, and R&D the chemical engineer may develop new idnustrial processes and scale up new technologies developed at laboratory scale by the chemists (and sometimes also by us). We have a key participation in the development of new alternative technologies (hidrogen, solar pannels, chemical batteries and cells, biogas, biodiesel, and so on)
I know collegues working in very several fields. For instance, piping design, plants design, quality management, plant management, plant operations, instrumentation and control systems, wastes treatment plants, governmental sector (in discharging permissions), mathematical modeling, and lot of different things. Even in some cases they overlap other disciplines (chemist, industrial eng., electronic eng., physics).
In my university a teacher says that we must be called "process engineers" because we can be usefull in any process.