As we shared, among many of the incremental requirements with the CNLOPB was a review of the termination program before we were to execute it, based on the information that we gained through the reservoirs, the pressure, and the conditions that we had.
We worked with the regulator to review that. The regulator then approved it, as well as was on site to observe the operation. What's involved with an abandonment or well termination program is once you're completed to TD, you've got a well bore in the well where you've installed a series of, in this case, four different sets of pipe or casing. It is then secured and placed with cement that both holds that in place as well as holds back the pressure and the fluids there. Below that, you have an open-hole section.
The program is designed to set cement plugs across those intervals to contain the pressure or the migration pathways of those fluids as you move up the well bore. In this case, we set four cement plugs in the open-hole lower section.
Then in the casing section, we set mechanical devices—packers, cement retainers—that then sealed that part of the well bore, set a cement cap on top of that, pressure-tested each one of those plugs to ensure it would hold and had integrity, and then on the last cap on the top of the surface, near the sea floor, we set that final plug. It is tested, both positively and negatively, and we take the pressure off to make sure that it holds back that pressure.
Once all of those conditions are met there, our philosophy is to keep at least three different barriers to flow in the well bore at all times and in the final abandonment.