A Unified Approach to Yield, Buckling, and Leak in Well Tubulars
- Malcolm A. Goodman (Altus Well Experts, Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 2018
- Document Type
- Journal Paper
- 27 - 40
- 2018.Society of Petroleum Engineers
- Tubular Connections, Connection Leak, Yield and Buckling, Casing Design, Tubing Design
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- 305 since 2007
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Yield and buckling are independent of hydrostatic pressure. However, leak in a threaded connection depends on hydrostatic pressure, and hence, leak resistance is a function of connector location in the string. It also means that von Mises stress alone is insufficient to characterize connection leak. Like pipe-body yield and buckling, a simple consistent failure theory derived from principles of mechanics is proposed for leak in threaded connections. In addition, the buckling fictitious force is reformulated as a nonfictitious expression to clearly show independence of hydrostatic pressure. Two leak constants—thread modulus and makeup leak resistance—are introduced and evaluated with simple example cases. To quantify results, a 7-in. long-thread-casing (LTC) connection is modeled with the new leak criterion, and results demonstrate that the connection can withstand differential pressures higher than the published ratings because of hydrostatic pressure. A new connection safety factor is defined, and a leak line and a leak circle are developed for graphical purposes to quickly identify critical loads for leak.
|File Size||1 MB||Number of Pages||14|
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