The objective of this work is to show the experience in the use of tubular plunger pumps for production in viscous oil, in the Estreko and Alto do Rodrigues fields.

Based on the fields surveys we observe "in loco" the problems existents and analyse them. Suggestions were made for pumps changes, with the purpose of improving its performance.

Cargo loss calculations in the traveling valve annular were made using the "BULLETIN API 13D".

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