Thailand has been an oil and gas producer for many decades, with falling reserves amid rising domestic petroleum consumption. Proven oil reserves in Thailand is estimated at around 453 million barrels, while proven natural gas reserves stood at about 10.1 Tcf. PTT Exploration and Production (PTTEP), the upstream subsidiary of state-owned PTT Public Company Limited (PTT), is the dominant player in the Thai petroleum industry. Chevron, Total, Mitsui and BG Group are some of the bigger foreign companies with a presence in Thailand's petroleum sector.
Process engineers are found in almost all industrial plants, and they are responsible for the design, operation, control and optimization of chemical processes. They examine how raw materials are converted into useable productions and how to improve the process. Process engineers in the oil and gas industry are usually focused on the downstream portion including chemical plants and refineries, however their knowledge can be useful in manufacturing plants as well as in upstream and midstream operations. Due to the extensive knowledge of chemical processes that these positions require, process engineers usually hold chemical engineering degrees.