Radius of investigation does not change with changing the production rate.

The pressure change beyond the radius of investigation is independent of rate.

After the pressure effect is felt at the boundary, the flow regime switches from transient to PSS

After the pressure effect is felt at the boundary, the flow regime switches from transient to PSS only if there is no external support.

After the pressure effect is felt at the boundary, the flow regime switches from transient to PSS only if there is no external support. In addition, production rate at standard conditions must be constant.

PSS/SS flow regimes are always preceded by transient flow.

Pressure derivative with respect to time (𝜕𝑝/𝜕𝑡) is negative during production.

Pressure derivative with respect to time (𝜕𝑝/𝜕𝑡) is independent of radius and time during PSS flow.

For a constant rate, 𝜕𝑝/𝜕𝑟 is constant at the wellbore regardless of flow regime.

At any given location in the reservoir, 𝜕𝑝/𝜕𝑟 does not vary with time over the PSS flow period.

For PSS flow, 𝜕𝑝/𝜕𝑟 is zero at the reservoir external boundary.

The Cartesian graph shows the pressure versus radius. The solid curve shows _______and the dashed curve shows________.

The semilogx graph below shows the pressure versus radius. SS is shown by_____curve and the PSS is shown by_____curve.

The wells in Figure 7-9 below experience identical decrease in the average pressure under PSS flow.

The wells in Figure 7-9 below experience identical decrease in the flowing pressure under PSS flow.

Exponential integral of a negative number is positive.

The exponential integral can be approximated by logarithmic function after sufficiently long time.

The exponential integral can be approximated by logarithmic function after sufficiently long time.

The well production at the surface comes purely from expansion of the wellbore fluids at the beginning of a well test.

Constant production rate at the surface implies constant rate at the sandface.

Constant production rate at the surface implies constant rate at the sandface after sufficiently long time.

In the context of well pressure testing, p is

dΔp/dlnt = t dΔp/dt.

The slope of logarithmic pressure derivative on the log-log diagnostic plot is zero during the transient radial flow.