Changes

To minimize the production of unwanted gas or water, flow rates from the well must be maintained so that the pressure gradients around the wellbore will not cone in the unwanted fluids. Flow performance calculations or reservoir models can be used to help predict the optimum production rates. However, because of pressure depletion within the oil zone, a pressure differential will eventually develop between the water and/or gas zones, such that encroachment will eventually occur. After this point, the well may soon become uneconomical due to the production of these unwanted fluids.

To minimize the production of unwanted gas or water, flow rates from the well must be maintained so that the pressure gradients around the wellbore will not cone in the unwanted fluids. Flow performance calculations or reservoir models can be used to help predict the optimum production rates. However, because of pressure depletion within the oil zone, a pressure differential will eventually develop between the water and/or gas zones, such that encroachment will eventually occur. After this point, the well may soon become uneconomical due to the production of these unwanted fluids.

Several authors have studied these types of reservoirs to determine which production methods result in the maximum amount of produced oil. [Byrne and Morse<ref name=Byrne_and_Morse_1973>Byrne, W. B., Jr., and R. A. Morse, Water coning may not be harmful—Part 1: The Oil and Gas Journal, September 3, p. 66-70.</ref> evaluated various reservoir and completion scenarios and determined that increasing the well penetration and increasing the pressure drawdown at the producing well would result in an increase in the water-oil ratio. However, there was a corresponding increase in the oil production of the same order of magnitude. Their results showed no indication that ultimate recovery was adversely affected by the increased producing rates.

Several authors have studied these types of reservoirs to determine which production methods result in the maximum amount of produced oil. Byrne and Morse<ref name=Byrne_and_Morse_1973>Byrne, W. B., Jr., and R. A. Morse, Water coning may not be harmful—Part 1: The Oil and Gas Journal, September 3, p. 66-70.</ref> evaluated various reservoir and completion scenarios and determined that increasing the well penetration and increasing the pressure drawdown at the producing well would result in an increase in the water-oil ratio. However, there was a corresponding increase in the oil production of the same order of magnitude. Their results showed no indication that ultimate recovery was adversely affected by the increased producing rates.

==Near wellbore restrictions==

==Near wellbore restrictions==