Feasibility study assesses suitability of injection wells for CCS project in the Asia Pacific region

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.

Client challenge

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.

Our recommendations

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.