During the drilling campaign in the Tapi field, Ecuador, events of total losses and directional unexpected behaviors were observed. These issues represent a high risk in the operations and required a better understanding of the geological structures. The use of a new Logging While Drilling (LWD) Micro-Resistivity technology was used for the first time in Tapi field, Ecuador to study the geological and geomechanical characteristics of this field in detail.

The tool string was run as a penta-combo with a rotary steerable system with the purpose of getting a hole in gauge and consequently a better image quality. The LWD micro-resistivity images tool provided images of the borehole. The interpretation of the Micro-Resistivity Image started showing an average structural dip trend towards NE, identifying a main structural trend of the field.

Two post-drill geomechanical models based on wellbore stability were made in the Tapi I and Tapi II wells. Using the LWD micro-resistivity images technology the current geomechanical model was confirmed. Based on the geological information acquired through the image interpretation (natural fractures orientation, breakouts, faults, structural and stratigraphic dips), the geomechanical model uncertainties were minimized.

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