Degradation of titanium drillpipe from corrosion and wear
- Colorado School of Mines, Golden, CO (United States)
- Metallurgical Consultants Inc., Montebello (United States)
Drilling deeper than 35,000 ft is limited by the extreme hook loads of steel drillpipe and temperature constraints of aluminum drillpipe. Titanium Alloys Ti-6Al-4V and Beta C have been proposed for use in drillpipe for wells deeper than 35,000 ft because of their high strength/weight ratios, superior high-temperature corrosion resistance, and thermal stability. Their suitability in drilling environments, however, has not been evaluated. To determine the corrosion and wear characteristics of two types of titanium-alloy drillpipe under dogleg conditions, a test cell was constructed to test titanium drillpipe joints in contact with API Spec. 5CT Grade P-110 casing in different drilling muds. Titanium-alloy pipe and Grade P-110 casing wear rates were measured, and tests showed that both titanium-alloy pipes exhibited much greater wear than did steel drillpipe in water-based mud under the same conditions. Test data showed that the total wear rate of Alloys Ti-6Al-4V and Beta C in a drilling environment is a combination of mechanical wear and corrosion.
- OSTI ID:
- 6018268
- Journal Information:
- SPE Drilling and Completion; (United States), Journal Name: SPE Drilling and Completion; (United States) Vol. 8:2; ISSN XZ211N
- Country of Publication:
- United States
- Language:
- English
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