A mixture of hydrocarbons, hydrogen, and/or other formation fluids are produced from the formation.

As the well is being drilled, formation fluid flows into the wellbore and up to the surface.

The propped fracture is permeable enough to allow the flow of formation fluids to the well.

Well control means no uncontrollable flow of formation fluids into the wellbore.

The pathway that is created allows formation fluids to flow into the wellbore and onward to the surface.

Subnormal pressures may also be induced through depletion of formation fluids.

Kick is defined as an undesirable influx of formation fluid in to the wellbore.

Kick is the entry of formation fluid into the wellbore during drilling operations.

It uses the mud weight to provide sufficient pressure to prevent an influx of formation fluid into the wellbore.

A day later the well suffered a 'kick', an influx of formation fluid into the well bore.