“We have a highly experienced team of well integrity experts that worked to assess the well control contingency of the CO2 injection wells. The same principles apply to all types of wells, producers or injectors. The operator’s CCS system prevents millions of tonnes of greenhouse gases from being vented into the atmosphere, so we are proud to play a part in this project,” says Morten Haug Emilsen, well control manager at AGR.
Our Well Control and Well Integrity team of experts were tasked to assess well control contingency of CO2 injection wells to ensure capability of safe workover operations. Over the life of this CCS system, more than 100 million tonnes of CO2 is expected to be mitigated, with more than 8 million tonnes having been injected to date.
The purpose of the study was to estimate the feasibility and requirements for performing bullheading operations on the injection wells. Bullheading – pumping fluid down the wellbore – is performed during workover operations (before replacing equipment, setting plugs, etc.) to bring the surface pressure down to zero. It can also be performed to re-establish a well barrier against the reservoir pressure as a part of a well kill operation before the final kill is achieved by setting cement plugs.
In connection with the study, we conducted data evaluation, prepared scenario definitions and shut-in simulations and evaluations. Our team also conducted bullheading down the tubing and provided recommendations with sensitivity on failing gas lift valve dummy.