According to the company, dynamically-positioned drilling units typically operate in HV split-bus or open-bus configurations, with the power management switchboards operating in ‘silos’. But more engines must be online than might be needed for the total operational loads, potentially raising emissions.
However, by upgrading the rig power management systems to allow for closed-bus mode, which ties the switchboards together, the power plant can run with fewer engines and optimal loads, the company concluded.
ADC’s analysis suggested that DP rigs operating in closed-bus configuration could reduce their annual CO2 emissions by 4,800 metric tons/yr (5,291 tons), an annual fuel saving of $620,000, with engine running hours cut by 20%.
And with fewer engines online, there is potential for maintenance savings of up to $150,000/yr.
Austin Hay, director at ADC, said: “We recognize this enhancement requires considerable investment from rig owners and operators but as the sector continues its efforts to deliver more sustainable operations, this capital is essential to support net zero goals.
“Existing rigs and vessels are critical components in the energy transition, and we are already working with a number of clients to advise them through this process to ensure that assets continue to operate safely and efficiently with minimal environmental impact.”