Changes

==Production trends==

==Production trends==

[[file:drive-mechanisms-and-recovery_fig3.png|left|thumb|{{figure_number|3}}Solution gas drive reservoir.]]

[[file:drive-mechanisms-and-recovery_fig3.png|thumb|{{figure_number|3}}Solution gas drive reservoir.]]

Solution gas drive reservoirs show characteristic changes in reservoir pressure, producing gas-oil ratio, and oil and water production rates during the life of the reservoir. If the reservoir is initially undersaturated, the reservoir pressure falls quickly during oil production because of the small compressibilities of oil, water, and rock. Pressure drops of several hundred pounds per square inch can easily occur over a matter of months. Because the only gas produced is that which evolves from the produced oil in the wellbore, the gas-oil ratio (GOR) remains constant until the reservoir reaches the bubblepoint.

Solution gas drive reservoirs show characteristic changes in reservoir pressure, producing gas-oil ratio, and oil and water production rates during the life of the reservoir. If the reservoir is initially undersaturated, the reservoir pressure falls quickly during oil production because of the small compressibilities of oil, water, and rock. Pressure drops of several hundred pounds per square inch can easily occur over a matter of months. Because the only gas produced is that which evolves from the produced oil in the wellbore, the gas-oil ratio (GOR) remains constant until the reservoir reaches the bubblepoint.