Successful Perforation Operation Experience in a Geothermal Well of Salavatli Geothermal Field

Abstract

Salavatlý geothermal field in Turkey has been developed during the last 9 years, and 4 power plants with a totaling power generation capacity of 52 MWe were installed. It has been started to drill production wells for the fifth power plant. One of the wells drilled for this purpose was aimed to tap deeper sources that are believed to exist has reached 2500 m with no permeability. But, a very hot horizon was detected in the upper part of that well behind the 9-5/8” production casing. So it was decided to perforate that horizon. Perforation, though in oil and gas industry is extensively used, in geothermal completion technology is very rare. As far as we know, it was used in Cerro Prieto and in one well Mofete field (near Naples). So, the identified horizon was twice perforated. A build-up test conducted after the first perforation operation revealed unusually high skin factor of 100. After another perforation and a couple of acidizing operations skin factor is somewhat reduced but still remained high. Resulting well has turned out to be a respectable production one. The operations have been successful. In this study, perforation and stimulation efforts will be reported together with supporting well testing, and results will be presented.