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Aquifer and Waterdrive Classification

Waterdrives are classified based on the location of the aquifer relative to the reservoir as either peripheral, edgewater, or bottomwater. They are also classified based on the aquifer's strength and ability to deliver recharge water to the reservoir. A strong aquifer has a water influx rate close to the reservoir's withdrawal rate, resulting in minimal pressure decline. Moderate or weak aquifers have recharge rates lower than the withdrawal rate, causing greater pressure declines than a strong aquifer but less than a non-waterdrive reservoir. An aquifer's strength depends on its size and conductivity.

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81 views1 page

Aquifer and Waterdrive Classification

Waterdrives are classified based on the location of the aquifer relative to the reservoir as either peripheral, edgewater, or bottomwater. They are also classified based on the aquifer's strength and ability to deliver recharge water to the reservoir. A strong aquifer has a water influx rate close to the reservoir's withdrawal rate, resulting in minimal pressure decline. Moderate or weak aquifers have recharge rates lower than the withdrawal rate, causing greater pressure declines than a strong aquifer but less than a non-waterdrive reservoir. An aquifer's strength depends on its size and conductivity.

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Jitendra Kumar
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Waterdrive and aquifer classification

Waterdrives are classified in several ways. First, they are classified according to the location of the aquifer
relative to the reservoir:

Peripheral waterdrive -- the aquifer areally encircles the reservoir, either partially or wholly,

Edgewater drive -- the aquifer exclusively feeds one side or flank of the reservoir

Bottomwater drive -- the aquifer underlays the reservoir and feeds it from beneath

Waterdrives also are classified according to the aquifers strength and to how well the aquifer delivers
recharge water to the reservoir. The aquifer strength also refers to how well the aquifer mitigates the
reservoirs normal pressure decline. A strong aquifer refers to one in which the water-influx rate approaches
the reservoirs fluid withdrawal rate at reservoir conditions. These reservoirs also are called complete
waterdrives and are characterized by minimal pressure decline. Strong aquifers are generally very large in
size and highly conductive. A moderate or weak aquifer is one in which the water recharge rate is
appreciably less than the reservoirs fluid withdrawal rate. These reservoirs are called partial waterdrives
and they are characterized by pressure declines greater than a complete waterdrive but less than a
volumetric reservoir. An aquifers weakness is related directly to its lack in size or conductivity.

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