Previous Sigma clients include:
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Arabian Gulf Oil Company - Libya
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Brega Petroleum Marketing Company – Libya
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Mabruk Oil Operations - Libya
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Wintershall Holding GmbH - Libya
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Saline Water Conversion Corporation - Saudi Arabia
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Sirte Oil Company - Libya
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Waha Oil Company - Libya
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Ras Lanuf Oil & Gas Processing Company - Libya
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Weatherford Oil Tools GmbH – Algeria
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Mellitah Oil & Gas – Libya
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Nigerian National Petroleum Corporation - Nigeria
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Zawia Refining Company - Libya
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Zueitina Oil Company – Libya
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