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Since Okwori field was discovered offshore Nigeria in 1972, several successive lease holders studied the possibility of development, but the field’s geological complexity made development too difficult to be considered economic. It was not until Addax Petroleum Nigeria Ltd. acquired the lease in 1998 that a serious attempt was made to exploit the field’s potential. A development plan was put together and was approved by the Nigerian regulators in 2002.
To develop the field economically and address the difficulties it posed, it was decided to use a series of subsea wells, each completed in multiple zones and tied back to an FPSO. The wells were to be completed using a combination of expandable sand screens and remotely operated intelligent completion flow valves. Due to the complexity of the completion, Addax chose to use a single contractor to supply all the components. When the initial completion was attempted, a vital piece of downhole equipment . . .
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