Callaghan Innovation Research Papers

Back to Research Papers

TitleThe effect of drilling fluid and temperature on the cement/rock interaction in wells
Publication TypeJournal Article
Year of Publication2016
AuthorsSilva, J., and Milestone N.B.
JournalAdvances in Cement Research
Pagination189 - 201
Date Published2016
ISSN09517197 (ISSN)
KeywordsAlumina, American Petroleum Institute, Cement industry, Cementing system, Cements, Curing temperature, Drilling fluids, Geothermal industry, Geothermal wells, Harsh environment, High alumina cements, Interfaces (materials), Oil well drilling, Portland cement, Rock drilling, Rock formations, Setting, Volcanic formation, Well drilling
AbstractThe reduced lifetime of geothermal wells is one of the main issues facing the geothermal industry, with cement durability being one of the main causes for shortening of a well's life. While most wells are cemented with American Petroleum Institute (API) class cements, alternative cementing systems are currently being considered. In this paper, the interactions of two alternative cement formulations with a typical geothermal rock formation are compared with a class A cement. This allows understanding of the most critical zone in the geothermal cement, which is the outermost layer where the cement encounters and, consequently, interacts with the exterior harsh environment, including the volcanic formation and brine. The faster setting of white cement and high-alumina cement compared with the well Portland cement seems to reduce the reaction extent with the rock. For all the cements tested, both the increased curing temperature (from 150°C to 290°C) and the use of bentonite as drilling mud significantly decreased the bond between the cement and the rock.

Back to top