Collapse and Bending Analysis of Slotted Liners with Laboratory Tests and 3D FEM
- Xiaoda Liu (Texas A&M University) | Nobuo Morita (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- March 2020
- Document Type
- Journal Paper
- 2020.Society of Petroleum Engineers
- bending, 3D finite element method, collapse, slotted liner
- 6 in the last 30 days
- 60 since 2007
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The goal of this research is to study the structural integrity and slot width change of slotted liners by comparing them with a 3D finite element analysis and experimental study. Slotted liners are widely used because of their ability to ensure wellbore integrity and sand control. During installation and operations, the slotted liners must be strong enough to hold axial loads and radial compression to prevent excessive buckling and deformation of slots. Laboratory collapse and bending tests were conducted with commercially available slotted liners. Experiments were designed to select the grades of materials, diameter/thickness of pipes, and slot patterns. Finite element models were developed to predict the integrity of slotted liners and acceptable slot width changes. The study considered slotted liner design and analyzed how much material grades, casing/tubing dimension, and slot patterns affect the risk of slotted liner failure. The practical implications of this work to the oil fields are (1) a numerical simulation model can predict the closure of slots with reasonable accuracy if the work hardening stress-strain curve after elastic limit is accurately input; therefore, we may select the slotted liner design with sufficient stability after installation, and (2) the strength gains due to work hardening are significantly larger for a lower-grade base pipe than a higher-grade base pipe. Therefore, we need to re-evaluate using a lower-grade base pipe before using a thinner high-grade base pipe for some applications.
|File Size||2 MB||Number of Pages||20|
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