Corrosivity of oilfield brines acidified by CO{sub}2

摘要

An operator washing to drill, complete or work over a well with a clear fluid has to decide between halide or formate I, brines. The corrosivity of the brine under expected wellbore conditions is a key criterion used in the fluid selection process With proper pH control, both calcium halide: brines (CaBr{sub}2 and CaCl{sub}2) and formate brines (NaCOOH, KCOOH and CsCOOH) are non-corrosive over a wide temperature range in an oxygen-free environment. In addition, formate brines are known to be non-corrosive in the presence of oxygen and when contaminated withhalides.