Deep Offshore Innovation and Expertise on Display with CLOV

Once again, Total has met a challenge offshore of Angola, this one twofold. 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 metres of water. Given the project's environmental stakes, we have marshalled all our expertise in deep offshore projects, defined as oil and gas developments located in more than 500 metres of water. We are using more efficient, innovative equipment and emphasising local content.

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    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

    CLOV, a major deep offshore project

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    The development plan for CLOV in Angola.
    Our people devised a blueprint for a deep offshore oil project some 140 kilometres off the coast of Luanda that distills the combined success of earlier deepwater projects in Angola.

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    Norway, 2012.
    A multiphase pump system is transported to a test site.

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    Norway, 2012.
    Arrival of the multiphase pump system at the test site.

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    Norway, August 2012.
    The installation of the pumps in their module.

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    Norway, August 2012.
    The installation of the pumps in their module.

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    Assembly of the FPSO hull in dry dock, January 2012.

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    Hull launch, March 2012.
    After three months in dry dock where the mega-block was assembled, the FPSO hull measures 305 metres.

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    Installation of the topsides on the hull, autumn 2012.
    Ten topsides modules manufactured in South Korea are lifted and installed on the hull. Some of them weigh close to 3,000 tons.

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    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.

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    The FPSO reaches its final destination, January 2014.
    The FPSO is anchored and tied back to the various facilities.

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    Deep offshore experts.
    Inspection of the equipment that will be installed in waters over 1000 metres deep.

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    The CLOV FPSO in production on block 17.

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    Official opening of CLOV in the presence of Patrick Pouyanné, Chairman and CEO, and Executive Administrator of Sonangol, Paulino Jeronimo, December 2014.

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    CLOV FPSO, on block 17 offshore of Angola.

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    CLOV FPSO docked at PAENAL shipyard in Angola.

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CLOV: A Project With Many Challenges

Since 2014, the CLOV fields have been producing 160,000 barrels of oil per day. Yet bringing on stream a project of this scale is always a technological, human and environmental challenge. Water pressure 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, Total again tapped into the expertise acquired on earlier projects in the field of deep offshore operation in environmentally sensitive areas. The use of cutting-edge equipment, designed to be increasingly environmentally friendly with each development, is also key:

  • Subsea multiphase pumps

    These pumps, installed at a water depth of almost 1,200 metres, are called “multiphase” because they can handle a fluid composed of oil, gas and water. Their real benefit will become apparent after two or three years of production, when reservoir pressures decline and they allow us to maintain 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, a more efficient solution that is also better for the environment.

Lastly, record amounts of equipment were fabricated and assembled in Angola, totalling 10 million hours of local content. 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, by training Angolan engineers and operators.

The overall development plan for CLOV uses technologies that have already proved effective on Girassol, Dalia and Pazflor. After the Pazflor development in Angola was awarded the Offshore Technology Conference (OTC) Distinguished Achievement Award for Companies, the technological excellence and operational efficiency of the Total teams was commended at the Doha International Petroleum Technology Conference held in December 2015. CLOV received the Excellence in Project Integration award in recognition of Total’s deep offshore expertise. In just a decade, Total has demonstrated excellence in this field, with a number of projects worldwide.

 

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