In a recent test, a foaming surfactant diverted steam into the upper oil zones of a Morichal field well in eastern Venezuela. In prior cycles, the steam had entered thief zone intervals lower in the well. The field trial was conducted by Lagoven SA, an affiliate of Petroleos de Venezuela SA (Pdvsa), Venezuela's state oil company. Although results are preliminary, Lagoven said the injection phase was successful, and it is optimistic that during the production phase of the cycle additional oil will be recovered from the newly stimulated zones. Lagoven said flowmeter logs clearly indicate all steam was diverted into th...

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