Abstract
The stability of shales rich in clay is deeply affected by its complex physical and chemical interactions with drilling fluids. Thus, these rocks with a high content of clay have shown significant changes, such as swelling or expanding, when placed in contact with aqueous fluids due to the adsorption of polar molecules of water or hydrated ions dissolved inside . These changes may cause the collapse of the rock during the drilling with water-based drilling fluids. For a better understanding of the phenomenon of interaction between the rock and the drilling fluid, this study aims to analyze reactivity of shales from the Bacia do Araripe through its characterization. In order to do so, the shales were characterized by CEC, XRF, XRD and Foster swelling. The results indicated that the shales showed significant values of CEC, FRX composition close to that of smectite, and XRD pattern with characteristic peaks of smectite. Regarding the Foster swelling, the shale that presented the highest CEC (F-IP) also presented the highest value of swelling, indicating that the CEC can be applied as an indicative parameter of the reactivity.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Revista Principia - Divulgação Científica e Tecnológica do IFPB
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
