Koluel Kaike-El Valle and Piedra Clavada are two blocks owned by Pan American Energy (PAE) in the San Jorge Basin. For operational purposes, PAE has merged the two blocks into one project. Given the mature nature of the fields, infill drilling and water injection are important in slowing production decline. The Koluel Kaike-El Valle and Piedra Clavada blocks lie in the southeastern San Jorge Basin. As is usual in this basin, Koluel Kaike and Piedra Clavada have high degrees of complex faulting, and are highly compartmentalised. Consequently, a large number of wells have been required.