ESC conducted a Remedial Action Plan in 2016 for drilling waste and its operations in West Kalimantan, Indonesia.
ESC was commissioned by a major oil company to prepare and cost alternative remedial action plans for drilling wastes at its operations in Indonesia. A total of nearly 100,000 tonnes of waste had been deposited in more than 25 temporary storage pits at seven oil production locations.
Hydrocarbons had largely been bioremediated, but high concentrations of heavy metals derived from barytes drilling mud remained and had to be addressed. Remedial options considered included cementation, engineering designed disposal cells, incineration in cement kilns and use of a waste disposal accredited disposal contractor.
A comprehensive sampling program was undertaken to categorise the wastes and site visits were accompanied by representatives of the Ministry of Environment and their technical advisers from USEPA. Ultimately use of a licensed waste contractor, the most expensive option was adopted given the long-term legal liabilities with on-site disposal cells although that had been the cheapest option.