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In addition to rock and fluid properties, drive mechanisms—which describe the source of energy for moving fluids into, through and out of a reservoir—also determine how fluids move within the reservoir. The primary natural drive systems are water drive, solution-gas drive, gas-cap drive and gravity drive (Figure 1).
Apr 1, 2022 · The reservoir drive mechanism supplies the energy that moves the hydrocarbon located in a reservoir container toward the wellbore as fluid is removed near the wellbore. There are five common drive mechanisms: Water drive; Gas expansion; Solution gas; Rock or compaction drive; Gravity drainage
- Solution Gas Drive
- Production Trends
- Gas Cap Drive
- Water Drive
- Combination Drive
- Gravity Drainage
- See Also
In a solution (or dissolved) gas drive reservoir, the oil-bearing rock is completely surrounded by impermeable barriers. As the reservoir pressure drops during production, expansion of the oil and its dissolved gas provides most of the reservoir's drive energy (Figure 3). Additional energy is obtained from the expansion of the rock and its associat...
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. Pressu...
In a gas cap drive reservoir, the primary source of reservoir energy is an initial gas cap, which expands as the reservoir pressure drops (Figure 4). Additional energy is provided by the expansion of solution gas released from the oil. Less significant drive contributions are provided by the expansion of the rock and its associated water.
In a water drive reservoir, the oil zone is in communication with an aquifer that provides the bulk of the reservoir's drive energy. As oil is produced, the water in the aquifer expands and moves into the reservoir, displacing oil. Depending on the aquifer's strength, additional energy may be provided by solution gas expansion. Much less significan...
Most oil reservoirs produce under the influence of two or more reservoir drive mechanisms, referred to collectively as a combination drive. A common example is an oil reservoir with an initial gas cap and an active water drive (Figure 6).
Gravity drainage, or gravity segregation, is the tendency of oil, gas, and water to segregate in a reservoir during production due to their differing densities (Figure 7). As a secondary drive mechanism, gravity drainage occurs only in combination with one or more of the primary oil reservoir drive mechanisms. Conditions conducive to gravity draina...
Gravity drive mechanism is active in both gas cap and water drives, where the differences in densities act as source of energy. The energy is provided by upward liberated gas movement to the primary or secondary gas cap, and also downward movement of water to the aquifer.
Print. In Lesson 4, we discussed the drive mechanisms associated with oil reservoirs. For gas reservoirs, there are three drive mechanisms that are associated with conventional gas reservoirs and a fourth drive mechanism associated with unconventional gas reservoirs. These are:
There are five drive mechanisms that are associated with the Primary Production (production that occurs without any pressure maintenance supplied by fluid injection or by use of chemical, miscible, or thermal enhanced recovery methods) of a crude oil reservoir. These are:
Jul 15, 2015 · Depletion plans define how to use primary drive mechanisms to deplete hydrocarbon resources and how, when, or if these mechanisms should be supplemented for additional recovery. The plan includes: Projected ultimate recoveries; Producing rates of oil, gas, and water; Changes in reservoir pressure
