What is one of the indicators of a kick during drilling operations?

An increase in pump strokes during drilling operations can indicate a kick. This is because a kick, which is an unexpected influx of formation fluid into the wellbore, can alter the drilling dynamics. When a kick occurs, the pressure in the wellbore may change, leading to the need for additional pump strokes to maintain proper circulation and pressure control. The increase in pump strokes reflects the operator's attempt to manage the wellbore pressures and prevent an uncontrolled flow of hydrocarbons.

In the context of drilling, while other factors such as rotary speed or mud volume can be helpful indicators, an increase in pump strokes is more directly correlated with the immediate response needed to address a kick. Maintaining proper circulation and adjusting the pump rate are critical measures to ensure well control when a kick is detected.