Technical Committee Drilling and Completion Technology
Cement Corrosion in Oil and Gas Wells
The goal of DGMK-project 652 is to determine the main factors which are responsible
for cement corrosion in oil and gas wells, and to develop concepts for improvements
with respect to the cement slurry formulation, the cementing process and the impact of
factors such as temperature, electrolyte containing reservoir fluids, cement admixtures,
sour gas, CO2, acids etc.
To determine the state of the art, a literature survey in relevant
journals and monographies with the help of data banks was performed. The results are
presented in this report. At first, a detailed description of the chemistry and mineralogy
of oil well cement and its corrosion processes is given. Then, current experiences from
conventional concrete technology as well as the oilfield are presented. The state of art
of cement corrosion in the oilfield was investigated.
Overall, little literature about cement
corrosion in oil and gas wells exists. In particular, only a few field reports were ever published.
The subject of cement corrosion is mainly presented in the form of laboratory
tests simulating certain conditions and using common analytical methods.