Seadrill Limited informs it has secured new contracts for the jack-up units 'West Tucana', 'West Telesto', 'West Ariel', and 'West Prospero'. Additionally, the contract for the 'West Mischief' has been extended by four months. The total revenue potential for the four new contracts and one extension is approximately US$319- million. West Tucana, a Friede & Goldman JU-2000E jack-up rig, has secured a contract offshore Angola with Cabinda Gulf Oil Company Limited (CABGOC) - Chevron's wholly owned operating unit in Angola. The contract is for a firm period of 24 months.