The application of the recent technique of creating lateral tunnels by acid jetting into the formation has been a topic of discussion in Petrobras because it is a reliable, fast an economic way to increase the well productivity index in complex geology carbonate reservoirs.

In order to evaluate this technology, a pioneer intervention was carried out in the Garoupa field on a typical offshore well in Brazil. The objective was to simultaneously increase oil production and decrease water cut, by creating lateral tunnels at specific points in the well open hole section. The number of tunnels created as well as their positions were defined as a function of both, oil and water saturation profiles. Also mineralogical and geomechanical analysis were conducted as well as rock dissolution on different hydrochloric acid concentrations, in order to determine tunnel perforation rate and hole stability,

The application of this technology has generated important incomes to the oil operator and the same technique could be also applied on other different scenarios.

This paper illustrates the process from selecting the well candidate, premilary laboratory tests, treatment designs and field operation to after treatment well production results.

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