Casing Design
Description:
Oil and gas wells construction has different stages with different objectives, challenges and requirements. At each stage, one or more casing string is required to complete the interval and move forward to the next after cementing it in place. Wellbore pressures, temperatures, fluids in situ, lithology and other aspects determine the material and mechanical properties for each string. Understanding manufacturing process for tubular and stresses applied during well life cycle is a core skill for drilling engineer. Uniaxial design provides quick overlook meanwhile BI Axial and Tri-Axial design provide deep understanding of simultaneous effect of pressures, temperatures, axial, bending, torsional and point forces. Understanding the design safety factors and industry recognized load cases with the ability to migrate from conservative wild well design approach to Fit For Purpose and Risk based designs lead to construct smart wells with optimized cost. Casing wear and its drastic effect on tubular properties adds another challenge to practically estimate its magnitude and max allowable percentage before casing starts to fail. Casing running operational considerations, stock items and other aspects have direct effect on casing design workflow. Nowadays, advances in casing design can e easily modelled using commercial software
