Location and Ownership
The Chissonga field is offshore Angola in the western sector of Block 16 in 1,230 m of water in the lower Congo Basin. Maersk Oil operates the block with 65% interest. Sonangol P&P holds 20% interest, and Odebrecht Oil and Gas holds 15%.
Discovery and Appraisal Activity
In 2005, Maersk took a 50% interest in Block 16 and I mid-2009, announced the discovery of the Chissonga field while drilling the Chissonga-1 exploration well. The Larsen Deep Venture drillship drilled the well to 4,725 m TD, targeting a post-salt play. The production test showed oil flowed at 6,850 b/d of 36 degree API oil on a 36/64-inch choke.
In May 2011, Maersk announced plans to further delineate the Chissonga discovery by drilling two appraisal wells before the end of 2011. The Chissonga-2 well was drilled down dip of the discovery well and reached 6,052 m TD. A production test in the Oligocene age turbidities showed 6,650 b/d of 36 degrees API oil on a 36/64-inch choke. Maersk declared the field valid for commercial operations shortly thereafter.
Development and Status Update
In May 2013, Maersk and its partners started selecting contractors to be invited to bid on a floating, production, storage and offloading (FPSO) vessel and a tension leg wellhead platform (TLWP) to turn in production the Chissonga crude oil field offshore Angola. Maersk is planning to tie back 40 subsea wells to the FPSO.
The development plan calls for Chissonga to stand along Block 17 where Total is operating Girassol FPSO. Because of the similarities of the blocks, Maersk selected Doris Engineering to provide engineering services for the front end engineering and design (FEED) in Chissonga.