Well Completion Design, Integrity Evaluation and Stress Analysis on NCS

Abstract

The NORSOK D-010 defined well integrity as the application of technical, operational, and organizational solutions to minimize the risk level of uncontrolled fluid leaks from a well. During drilling and production phases, tubulars wear out due to mechanical, corrosion, and other means. Hence, the local breakdown of tubulars degrades the integrity of the well. The analysis of tubular will then be based on fracture mechanics instead of the commercial software uniform tubular stress theory. For long-term integrity, it is imperative to consider all operational loading scenarios, and continuously monitor the condition of the well. In this thesis, the Finite Element Method (FEM) was employed to simulate locally worn tubing under different loading scenarios the pressure and combined with temperature and bending stress. Results showed that the impact of pressure, temperature and bending combined loads are significant on undamaged and damaged tubular. During the production life of the well, it is vital to follow the condition of the well damage and redesign with the finite element method since the commercial software assumes tubular as a uniform.