The El Furrial field is located in Monagas State, Eastern Venezuela. It was discovered in February 1986 with the drilling of The Furrial-1 well (Ful-1) in the Naricual foraation at a depth of 14,000 feet, which resulted in a potential of 7,000 BPD of oil with a gravity of 27 oAPI (1/2" choke).

The structure of the field is an asymmetric anticline that is cut by reverse faults which run almost parallel to the axis of the structure and by normal cross faults. The Naricual formation is the most important in the structure and contains the largest volume of medium crude which is deposited in a marine environment near the coast. Its thickness ranges from 1,470 to 1,700 feet. This formation is characterized by a marked variation in fluid composition and oAPI gravity with depth, ranging from 29 oAPI at the top of the structure to 8 oAPI on its flanks. The complexity of the field posed a significant engineering challenge to design a plan to obtain information that would, at the lowest assessment costs, clarify the degree of vertical and areal communication between the bodies of sand, characterize the vertical distribution of fluids and optimize the selection of completion intervals. All of this was possible with the use of the tool called Formation Multiple Test (FMT).

This article describes the use of the FMT in the effective characterization of the Naricual foraation and its contribution to the identification of the optimum development strategy for the field.

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