The sole geothermal power plant of Turkey with a capacity of 17.5 Mwe has been established at Kizildere Geothermal Field. The plant is fed by 9 wells. The production wells have to be cleaned periodically because of high scaling in the casings. Scale inhibitor injection, acidizing and mechanical reaming methods were tried to prevent scaling or to remove scaling from the wells. Mechanical reaming appeared as the most economical method with the effect at the cost of Using mud or water as circulation fluid at mechanical reaming caused formation damage in the reservoir. To eliminate this problem, the wells were reamed while the wells were flowing. The first meters of the wells where reaming while the well was flowing had not been possible, reamed with foam with success. Thus, the wells were reamed mechanically without any formation damage problem.

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