Changes

===Productivity index===

===Productivity index===

To avoid coning, sand production, pipe collapse, or other harmful effects, wells might not be produced at their maximum wide-open flow rates. Therefore, the ability of a well to produce is usually determined by a productivity index (PI).<ref name=pt06r66>Kimmel, J. D., Dalati, R. N., 1987, Potential tests of oil wells, in Bradley, H. B., ed., Petroleum Engineering Handbook: Richardson, TX, Society of Petroleum Engineers, p. 32-1–32-16.</ref> The PI is a measure of the stock tank barrels (STB) of oil produced per day per psi drawdown under steady-state or pseudosteady-state flow conditions (see [[Production testing]]). Changes will show on periodic maps of PI during reservoir life indicating trends in reservoir depletion or formation damage.

To avoid [[Production problems#Water-gas coning|coning]], sand production, pipe collapse, or other harmful effects, wells might not be produced at their [[Absolute open flow|maximum wide-open flow]] rates. Therefore, the ability of a well to produce is usually determined by a [[Production testing#Single-point tests|productivity index]] (PI).<ref name=pt06r66>Kimmel, J. D., Dalati, R. N., 1987, Potential tests of oil wells, in Bradley, H. B., ed., Petroleum Engineering Handbook: Richardson, TX, Society of Petroleum Engineers, p. 32-1–32-16.</ref> The PI is a measure of the stock tank barrels (STB) of oil produced per day per psi drawdown under [[Steady state conditions|steady state]] or [[Pseudosteady state conditions|pseudosteady state flow conditions]]. Changes will show on periodic maps of PI during reservoir life indicating trends in reservoir depletion or formation damage.

===Solution gas to oil ratio===

===Solution gas to oil ratio===