1.
n. [Well Testing]
The portion of the volume of a
reservoir drained by a well. In a reservoir drained by multiple wells, the volume ultimately drained by any given well is proportional to that well's
production rate:
V
_{i} = V
_{t} x q
_{i}/q
_{t},
where V
_{i} is the
drainage volume of Well i, V
_{t} is the entire drainage volume of the reservoir, q
_{i} is the production rate from Well i, and q
_{t} is the total production rate from the reservoir.