Mechanisms and Applications of Casing Running Mechanics in CCUS Extended‐Reach Horizontal Wells

ABSTRACT In this paper, the research on casing running is analyzed. By analyzing the stress and deformation of casing string with centralizer, the calculation model of friction, bending and centralizer pointing force in the process of horizontal down‐hole running of casing string is derived, and the friction between casing and running hole wall is solved by iterative method. The mathematical model is used to entangle the bending force of casing. When the string is bent along the bending direction of borehole trajectory, the bending force is related to the casing outer diameter, cross‐sectional area and string length. Then, the influence of casing additional force, such as drilling fluid viscous resistance, keyway rock breaking resistance, casing buckling additional load, casing running dynamic load and rotating casing running, on casing friction is analyzed in detail. The dynamic load of running casing makes the casing in curved and vertical sections bear large alternating load of tension and pressure, and rotating casing running may be an effective measure to reduce the friction of running casing. To run casing safely in extended reach horizontal well, the floating casing technology was simulated and analyzed. The safety of the horizontal well casing has been compromised, providing a casing cement sheath safety guarantee for future CO 2 injection production measures in oil and gas wells.