Development of a Filming Amine Treatment Program at The Geysers

Abstract

Injection well failures along with shortened injection casing life span due to corrosion are expensive and operationally problematic. Various avenues have been explored in order to curtail injection well corrosion. Upgrading casing material, i.e. Chrome liners can be an alternative, but at an elevated cost. Chemical additions to neutralize the ph in injection fluid, i.e. caustic are inherently dangerous and expensive in order to convert large volumes of fluid to an acceptable ph level. Filming amines can be safe and effective in controlling corrosion in injection wells if applied correctly and at a sufficient dosage. Extending the life of an injection well in our steamfield is imperative due to the spiraling cost of replacement or repair. Calpine lost a number of injectors in the Unit 13, 16 and West Ford steamfields in the 80’s and 90’s due to corrosion. Calpine started looking into treating injection wells in the mid 90’s in order to extend their life expectancy. Coupons were first used to determine to progress and effectiveness of the filming amine program, later given away for casing calipers which provide a more effective and accurate. Various chemical suppliers were used to determine if filming amine could protect injection well casings. Currently the program has been successful in counteracting the effects of corrosion in our injection fluids.