Post by Admin on Apr 30, 2016 22:41:22 GMT
Reservoir drive mechanism
Is asource of energy for driving the fluids out through the wellbore
Primary recovery
Primary recovery refer to the production of oil and gas from areservoir without use of any process such as fluid injection to supplement the natural energy of the reservoir
Primary recovery mechanism
There are six driving mechanisms for oil recovery
Reservoir drive mechanism
Rock and fluid expansion drive mechanism
Reservoir drive mechanism
Can be difined as the mechanism wherein the displacement of oil from the formation to the
production wells is accomplished by rock and fluid expansion
Characteristics of rock and fluid expansion drive mechanism
Very rapid decline in pressure
Constant gas oil ratio that is equal the gas solubility at the bubble point pressure
Nil water production
Ultimate recovery factor is less than 5%
The Depletion Drive Mechanism
Reservoir drive mechanism
Can be difind as the mechanism wherein the displacement of oil from the formation to the
production wells is accomplished by expansion of solution gas
Characteristics of Depletion Drive Mechanism
Rapid decline in pressure
becouse there is no extraneous fluid or gas caps are available to provide areplacement of the gas and oil withdrawals
Increasing GOR
Water- free oil production
%Ultimate recovery factor my be average from 15 to 25
Well behavior requires pumping at early stage
Gas-Cap drive mechanism
Reservoir drive mechanism
can be difind as the mechanism wherein the displacement of oil from the formation to the
production wells is accomplished by expansion of original free gas cap
and can be difined as the presence of agas cap with little or no water drive
Characteristics of Gas-Cap drive mechanism
Reservoir drive mechanism
Slow decline in pressure
due to pressure tends to be maintained at a higher level in a depletion drive reservoir
Increasing GOR
Nil water production
Well behavior long life well
Water-drive mechanism
Reservoir drive mechanism
can be difind as the mechanism wherein the displacement of oil from the formation to the
production wells is accomplished by water influx from aquifer into the reservoir
Characteristics of water drive mechanism
very gradual decline in the pressure
due to the oil and gas withdrawals from the reservoir are replaced almost volume for volume by water encroaching into the oil zone
More or less constant GOR
Early increasing water production
Ultimate recovery factor ranges from 35% to 75% of the original oil in place
The Gravity drainage drive mechanism
Reservoir drive mechanism
Can be difinea as the mechanism wherein the displacement of oil from the formation to the producting wells is accomplished as aresult of differences in densities of the reservoir fluids
Characteristics of The Gravity drainage drive mechanism
Varible rates of pressure decline depending principally upon the amount of gas conservation
Low gas-oil ratio
due to migration of the evolved gas upstructure due to gravitational segregation of the fluids
Formation of secondary gas cap in reservoirs those initially were undersaturated
Little or no water production
ultimate recovery factor up to 80% of the original oil in place
The Combination driving mechanism
Reservoir drive mechanism
can be difinea as the mechanism in which both water and free gas are available in some degree to displace the oil toward the producing wells
Characteristics of The Combination driving mechanism
Relatively rapid pressure decline
Ultimate recovery from combination drive reservoirs is usually greater than recovery from depletion drive reservoir but less than recovery from water drive reservoir
Gas-Cap drive mechanism
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