Finite Element Modeling and Mechanism Analysis of Casing Damage in Oil Wells Under Liquid–Solid Interaction

Liquid–Solid Interaction is the main influence factor of performance analysis for oil well casing. For the oil well casing, it is necessary to calculate the liquid–solid interaction that includes fluid-structure interaction (FSI) and rock-casing interaction. The finite element model of casing in oil well is created through combinative application of ADINA-parasolid and ADINA-native modeling methods. Calculation method of two-way fluid-structure coupling for fluid-structure interaction and definition of contact for rock-casing interaction are introduced. The methods of solid and fluid modeling are analyzed, rock-casing friction is defined in solid model, and flow assumption and fluid structure interface conditions are defined particularly in fluid model. Damage of casing is worked out through computing of fluid-structure coupling with rock-casing interaction. According to the calculation results, mechanism analysis of casing damage in oil wells is analyzed, and some advice is proposed.