(5.2) Flashcards
It is a source of energy for driving the fluids out through the wellbore
Reservoir Drive Mechanisms
Reservoir Drive Mechanisms phenomena
•Expansion of reservoir fluids, oil, gas & water
•Liberation, expansion of solution gas
•Expansion of reservoir rock and reduction of pore volume
•Gravity forces
5 natural drive mechanisms
•depletion drive
•water drive
•compaction drive
•gravity drainage drive
•combination drive
2 types of depletion drive
•Solution gas drive
•Gas-Cap drive
A ___ reservoir is one in which the hydrocarbons are NOT in contact with a supporting aquifer
Depletion Drive Reservoirs
A ___ reservoir is a reservoir in contact with a supporting aquifer
Water Drive Reservoirs
Typical Cw
3 × 10⁶/psi
C = -1/V ∆V/∆P
•It is not a common drive mechanism
Compaction Drive
•It is due to the relative density of the fluids and high vertical permeabilities
•fractured reservoirs
Gravity Drainage Drive
Energy comes from the expansion of fluids in the reservoir and its associated pore space
Depletion Type Reservoirs
•No original gas cap aquifer
•Main source of reservoir energy
Solution Gas Drive in Oil Reservoirs
Oil expansion is very low
Depletion Drive - Gas Cap Drive
2 types of Water Drive Reservoirs
•edge water drive
•bottom water drive
2 types of Water Drive Reservoirs
•edge water drive
•bottom water drive
Rare for reservoirs to fit into the simple pure drive
classification
Combination Drive
