Petrovietnam Chemical and Services Corporation (PVChem), formerly Drilling Mud Corporation, is a Vietnam-based provider of oil exploration and refinery related supplies, services and equipment. It is engaged in the manufacturing and marketing of chemicals, substances and materials used in oil drilling and exploration activities. Its products include drilling mud, such as Barite, Ben Dak and Bentonite, as well as drilling additives and specialized oil well cement. The Company also trades chemicals and equipment used in oil drilling, exploration, processing and transportation activities, as well as provides technical support services to oil drilling activities, including oil well repair services. Other operations include water and waste water treatment, along with the trading of fertilizers.