The flow initiation pressure (FIP) is used as an
estimate of the differential pressure (between the
reservoir and the well) required to initiate
production of oil or gas. The standard practice to
measure FIP uses a constant flowback rate. This
method is shown to be inadequate to measure the FIP.
An improved flowback method, which uses a series of
constant differential pressures, is used instead to
measure the FIP. This method closely represents the
constant drawdown between the reservoir and the
wellbore. In addition the permeability during
flowback is measured at increasing...