Secondary kick indicators contain results which notify that a kick may be forthcoming. This results needed to be measured, observed and calculated. Pressure and temperature are general illustrations of measured results. Mud property changes, cutting size changes are illustrations of observed results while d-exponent is calculated result. In total it helps to notify a possible imminent kick.
Secondary indicators are normally non-actionable. However, they play an important role because usually, they are initial cautionary factors which a driller observes by representing that the drill bit is entering a possible kick occurrence zone. Furthermore, Combination of both indicators greatly increases kick detection (Fraser