| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Coatings and Surface Engineering for Environmental Protection
|
| Presentation Title |
Diamond-like Carbon Coating for Drill Collars – Test Experiences |
| Author(s) |
Nausha Asrar, Jeffrey Ham |
| On-Site Speaker (Planned) |
Nausha Asrar |
| Abstract Scope |
Failure of drill collars due to corrosion of non-magnetic collar materials is a challenging problem due to corrosion. Corrosion damages of the drill collars are usually on their internal surfaces due to aggressive mud chemistry (high content of H2S, CO2, dissolved oxygen, pH < 9 etc.) flowing through their annular side. To increase the corrosion resistance of non-magnetic drill collars, diamond like carbon (DLC) coating was applied on long internal surfaces of collars and tested. Roll-bending, fatigue, erosion and microstructural examinations were performed. Based on encouraging results of laboratory-base studies, field tests were performed. During field test, in HCl acid (used to release the collar) condition, challenges were faced. This paper deals with the laboratory test results and challenges faced during field tests. Possible causes of damages of the DLC coating in HCl acid conditions during field tests are also discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |