Formed in 1980, Trintoc entered the Point Fortin Football League that same year and immediately won the League title and then entered the fourth division of the Trinidad and Tobago Football Federation, which they also won in their first year.

It was also decided to join both football squads and United Petrotrin was born.

The team took up where Trintoc and Trintopec left off, winning several national championships, including two FA Trophy titles.

However, soon after there was a change in the management of the company and funding for football was considerably reduced.

United Petrotrin entered the Professional football league in 2005, as a combination of 2004 league participants South West Drillers and United Petrotrin of the Southern Football Association.