Multiaxial Cyclic Ratcheting in Coiled Tubing - Part I : Theoretical Modeling  

Oleh:

Tipton, Steven M. ; Rolovic, Radovan

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Engineering Materials and Technology vol. 122 no. 2 (2000), page 157-161.
Topik: axial diffusion; multiaxial; cyclic ratcheting; coiled tubing; theoretical modeling

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ87.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

Coiled tubing is a long, continuous string of steel tubing that is used in the oil well drilling and servicing industry. Bending strains imposed on coiled tubing as it is deployed and retrieved from a well are considerably into the plastic regime and can be as high as 3 percent. Progressive growth of tubing diameter occurs when tubing is cyclically bent - straightened under constant internal pressure, regardless of the fact that the hoop stress imposed by typical pressure levels is well below the material's yield strength. A new incremental plasticity model is proposed in this study that can predict multiaxial cyclic ratcheting in coiled tubing more accurately than the conventional plasticity models. A new hardening rule is presented based on published experimental observations. The model also implements a new plastic modulus function. The predictions based on the new theory correlate well with experimental results presented in Part II of this paper. Some previously unexpected trends in coiled tubing deformation behaviour were observed and correctly predicted using the proposed model.

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