K12-B

Abstract

Two different CO 2injection field tests are conducted in the nearly depleted K12-B gas field offshore the Netherlands in different compartments. The CO 2is originating from the produced gas (the methane contains a fraction of 13% CO 2), is separated on the production platform, and reinjected into the reservoir. The first test, finished in 2004, consisted of CO 2injection through a single well in a depleted reservoir compartment to test the injectivity. The second test is still ongoing in a nearly depleted reservoir compartment comprising two gas production wells and one CO 2injection well. This chapter describes the simulation results based on a detailed geological model and history matching to the production data until December 2005. A highly accurate match has been obtained.

In March 2005, two tracers were added to the injected CO 2so that injected CO 2could be discriminated from resident CO 2. Breakthrough of the tracers has been observed for both producing wells after 130 days (in 2005) and 463 days (in 2006). For the first well, the simulation results for CO 2breakthrough have been compared to the tracer time. Results were accurate within a few days. For the second well, the comparison could not be made yet because injection and production data are only available until the end of 2005.