Increased Tool Life and Enhanced Reliability for Bottomhole Assemblies in Harsh Environments
- Krutibas Panda (Halliburton) | Thomas Williams (Carpenter Technology Corp.) | Anthony Collins (Carpenter Technology Corp.)
- Document ID
- Society of Petroleum Engineers
- SPE Middle East Oil and Gas Show and Conference, 18-21 March, Manama, Bahrain
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 1.6 Drilling Operations, 1.12 Drilling Measurement, Data Acquisition and Automation, 7.2.1 Risk, Uncertainty and Risk Assessment, 1.6.1 Drill String Components and Drilling Tools (tubulars, jars, subs, stabilisers, reamers, etc), 7 Management and Information, 1.12.1 Measurement While Drilling, 4.2.3 Materials and Corrosion, 1.12.2 Logging While Drilling, 7.2 Risk Management and Decision-Making, 1.10 Drilling Equipment
- SCF-19 Alloy, M/LWD, Non-magnetic Stainless Steel, Drill Collar, Stress Corrosion Cracking
- 3 in the last 30 days
- 36 since 2007
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Non-magnetic collars must be strong, tough, and corrosion resistant to withstand dynamic drillstring loads while also providing robust housings for measuring and logging-while-drilling (MWD/LWD) tool electronics. This paper describes a materials solution to problems related to the corrosion of drill collars in hostile well conditions. Typical nitrogen-strengthened chrome-manganese drill collar alloys are at risk of early retirement or downhole failure due to pitting, stress corrosion cracking (SCC), and sulfide stress cracking (SSC). Tool non-productive time due to increased maintenance, repair, overhaul frequency, and premature removal from service increases operating costs. The results of laboratory trials in conditions representative of active drilling basins show the differentiated performance of a chrome-nickel stainless steel and nickel-based alloy 718 relative to more common chrome-manganese stainless grades currently in wide-spread use. The pitting resistance, SCC resistance, and SSC resistance of both chrome-nickel stainless and nickel grade were found to be significantly better under wide ranging conditions and confirmed the capacity of both alloy systems to outlast incumbent drill collar grades.
|File Size||1 MB||Number of Pages||10|
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