Deep Offshore Innovation and Expertise on Display with CLOV
Once again, Total has met a challenge offshore in Angola. This one is two-fold. It involved drilling 34 subsea wells to simultaneously extract and process two different types of oil in a sensitive natural environment from four new oil fields — Cravo, Lirio, Orquidea and Violeta, or CLOV for short — in 1,100 to 1,400 meters of water. Given the project's environmental stakes, we marshaled all our expertise in deep offshore projects, defined as oil and gas developments located in more than 500 meters of water. We are using more efficient, innovative equipment and emphasizing local content.
A brand-new FPSO for CLOV.
The floating production, storage and offloading vessel leaves the Daewoo Shipbuilding & Marine Engineering (DSME) shipyard in Okpo, South Korea, headed for Angola.
CLOV, a major deep offshore project.
CLOV, a major deep offshore project
The development plan for CLOV in Angola.
Our people devised a blueprint for a deep offshore oil project some 140 kilometers of the coast of Luanda that distills the combined success of earlier deepwater projects in Angola.
A multiphase pump system is transported to a test site.
Arrival of the multiphase pump system at the test site.
Norway, August 2012.
Installation of the multiphase pumps into the module.
Norway, August 2012.
Installing multiphase pumps into the module.
South Korea, 2011.
Construction of the FPSO hull begins at DSME’s Okpo shipyard.
Assembly of the FPSO hull in a drydock, January 2012.
Hull launch, March 2012.
After three months in drydock where the mega block was assembled, the FPSO hull measures 305 meters.
Installation of the topsides on the hull, fall 2012.
10 topsides modules manufactured in South Korea are lifted and installed on the hull. Some of them weigh close to 3,000 tons.
The FPSO reaches Angola, November 2013.
After a 75-day voyage, the FPSO berths at a yard in Angola so that the last topsides module, fabricated locally, can be installed.
The FPSO reaches its final destination, January 2014.
The FPSO is anchored and tied back to the various facilities.
Deep offshore experts.
Inspecting equipment that will be installed at more than 1,000 meters underwater.
The CLOV FPSO in production on block 17.
Official opening of CLOV in the presence of Patrick Pouyanné, Chairman and CEO, and Executive Administrator of Sonangol, Paulino Jeronimo, December 2014.
CLOV FPSO, on block 17 offshore Angola.
CLOV FPSO docked at PAENAL shipyard in Angola.
CLOV: A Project Brimming with Challenges
Since 2014, the CLOV fields have been producing 160,000 barrels of oil per day. Bringing on stream a project of this scale is always a technological, human and environmental challenge. Water pressure in the deep offshore is high, and temperatures hover around 0°C. In this fragile ecosystem and extreme environment, two types of oil are being produced simultaneously:
- A very high grade light oil, found in the oldest reservoirs (75% of reserves).
- A more viscous and therefore harder-to-extract oil, contained in younger reservoirs.
Banking on Innovation
To meet these challenges, we tapped into our expertise in the field of deep offshore operation in environmentally sensitive areas acquired from our previous projects. Also key is the use of cutting-edge equipment, designed to be more environmentally friendly with each evolution.
- Subsea multiphase pumps
Pumps installed at a water depth of almost 1,200 meters are called "multiphase" because they can boost a fluid composed of oil, gas and water. Their real utility becomes apparent two or three years into production when reservoir pressures decline and they allow us to keep up the field’s production.
- An all-electric floating production, storage and offloading (FPSO) vessel, with variable speed drive systems
The energy used to power the subsea and surface installations is produced by turbines similar to those used in the aerospace industry. They run on the associated gas produced from CLOV. Their variable speed drive systems ensure that they generate only the energy needed, without any surplus, which is a more efficient solution that is better for the environment.
Lastly, record amounts of equipment were fabricated and assembled in Angola, totaling 10 million hours of work by the local population. CLOV was the first FPSO to berth at an Angolan dock, and the integration of a locally manufactured water treatment module on the FPSO was another first for the country. The long-term partnership has helped build the country's industrial base and human potential.
The overall development plan for CLOV uses technologies that have already proved effective on Girassol, Dalia and Pazflor. In 2013, following the Offshore Technology Conference (OTC) Distinguished Achievement Award for Companies for the Pazflor development in Angola, the technological excellence and operational efficiency of the Total teams were recognized during the International Petroleum Technology Conference held in Doha in December 2015. CLOV received the "Excellence in Project Integration" Award, which demonstrates the oil and gas industry’s recognition of the deep offshore expertise displayed by Total. In just a decade, Total has demonstrated excellence in this field, with a number of projects worldwide.