Evaluation of Mechanical Properties of Different Casing Drilling Steels

An investigation into the mechanical properties of K55, N80, and P110 steels commonly used for casing drilling was carried out together with microstructural fractographic analysis. The results show that steel consisted almost fully tempered martensite exhibited a synergy combination static tensile, dynamic impact, fatigue crack propagation among three steels, possessing higher limit deeper tolerance before failure occurred. K55 pearlite network structure ferrite possessed high strain hardening exponent low impact property, which led to more suitable application under incidental large overload temperature change, but it unsuitable condition force. N80 were moderate, its property than lower P110; resistance also P110. can be selected according environment.