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Because the offshore oil and gasoline business transitions to extra sustainable practices, drilling rig operators are confronted with calls for to implement greenhouse gasoline (GHG) abatement measures as a part of their workload. Being the proprietor of the primary ever drillship that secured DNV’s Abate(P) notation, Scotland-based offshore drilling contractor Stena Drilling discusses every thing the corporate is doing to make its drill-ships ‘greener’.
Step one to lowering its carbon footprint for Stena Drilling is to comply with the ISO 50001 commonplace information for assessing the impacts its vitality use and the sources could possibly be conserved.
ISO 50001 is a voluntary worldwide commonplace, making use of to organizations of any dimension, which offers necessities for establishing, managing and bettering their vitality consumption and effectivity.
In January 2022, Stena Drilling obtained ISO 50001 certification, masking all of its rigs and the corporate’s Aberdeen assist facility. “We imagine we had been the primary worldwide driller on the time to obtain this certification throughout the fleet and workplace. An vitality crew was arrange at our Aberdeen headquarters to develop an Power Administration System (EnMS) and the way the system could possibly be adopted into our operations. We wanted to determine the place vitality saving enhancements could possibly be made and every rig contributed to this by creating their very own Power Effectivity Administration Plans (EEMPS). We knew for our vitality marketing campaign to be a hit, it could require the assist of all of our workers,” mentioned Erik Rønsberg, CEO of Stena Drilling.
Stena Drilling developed digital good meters, utilizing information obtained from tags on the vessels. Utilizing the meters, the corporate was capable of monitor the gasoline consumption and emissions in actual time or over a pre-determined time interval or exercise. The collected information was then fed to Energy Bi software program, which identifies the areas for enchancment.
“The info guides us to areas the place we will enhance our vitality effectivity and scale back our emissions which in flip ensures that we adjust to, and infrequently exceed, the necessities of the ISO commonplace,” mentioned Rønsberg.
To additional its vitality saving plans, Stena Drilling put in new reverse osmosis models on its rigs to supply recent water and scale back the boiler gasoline consumption on every drillship by roughly 3m³, which resulted in lowering the corporate general fleet gasoline consumption and emissions by roughly 8%.
Additionally, the hydraulic lifting system on Stena Drilling’s drill-ships was recognized within the EEMPs as one of many key areas the place the corporate may enhance effectivity. The software program was then developed and put in on its DrillMAX collection drill-ships to calculate the variety of hydraulic pumps required to carry out numerous drilling operations.
“The system additionally reveals how environment friendly the driller has been when following the really helpful set-up. A CO2 discount better than 2000 (Te)/yr per rig is achieved utilizing the software program.”Erik Rønsberg, CEO of Stena DrillingImage courtesy Stena Drilling
“The system additionally reveals how environment friendly the driller has been when following the really helpful set-up. A CO2 discount better than 2000 (Te)/yr per rig is achieved utilizing the software program,” added Rønsberg.
Additionally, the corporate put in variable frequency drives (VFDs) for its excessive load marine cooling pumps, which resulted within the discount of annual emissions by 1800 (te) together with a lift accumulator for the hydraulic ringline system which contributed additional 1,300 (te) to the general outcome“We’ve additionally commissioned a feasibility examine on the usage of various fuels. The options had been inexperienced methanol and ammonia. An in depth report has been obtained and that is now being studied by our engineering crew,” Rønsberg identified, noting additionally the corporate is exploring the usage of ‘artificial diesel’ produced number of vegetable and animal sources which may scale back CO2 emissions by as a lot as 90%.
“HVO can be utilized as an additive with none modification to engines and the CO2 discount is nearly equal to the share of HVO used, i.e., 10% HVO in provide ≈ 9% discount in CO2 emissions,” mentioned Rønsberg.
All of this, along with the joint work with certification society DNV, contributed to the corporate’s Stena DrillMAX drillship being awarded DNV’s Abate(P) notation – a primary drill-ship to obtain such classification.
The classification serves as a testomony to Stena Drilling’s rigorous monitoring of vitality consumption and the implementation of each operational and technical measures to notably scale back emissions.
“The blue-chip corporations that we’re working with are very fascinated with what we’re doing to chop gasoline consumption and decrease our emissions.“We’re additionally seeing co-investment with our purchasers into gasoline saving know-how and exploring various fuels. For brand spanking new tenders, there may be normally a query about environmental efficiency, however to this point normally not prescriptive necessities.
“Essentially the most trendy rigs are sometimes greatest, however our DrillMAX class models with the hydraulic lifting methods nonetheless look like very environment friendly after we’ve had the chance to measure towards our friends.
“I need to future proof as a lot as doable, in order that’s a key driver in continued funding in environmental efficiency on our rigs as in the end, this could possibly be the successful mixture for getting one of the best contract, whereas fulfilling our personal firm environmental aims on the similar time,” Rønsberg concluded. 
Picture courtesy Stena Drilling
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