The Oilfield Workers Trade Union (OWTU) has filed an injunction in the Industrial Court to stop Petrotrin from dismissing all its workers.
The application was filed by the OWTU's attorneys this morning.
The matter comes up for hearing tomorrow at 10 am.
The matter coincides with a march that the union will begin tomorrow, from San Fernando to Port-of-Spain, to demonstrate against the decision to close the refinery and send home workers.
The company has said that all workers will be sent home on November 30th.
The OWTU says it will issue a statement on the matter today.