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| time since the water injection rate has changed by the
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| cross-well pressure transient response (CTR) in producer W1 to the unit-rate production in injector W2 | ||||||||
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| drawdown pressure transient response (DTR) in producer W1 to the unit-rate production in the same well |
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For the finite-volume reservoir
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\delta q_1 = -f_{21} \cdot \delta q_2, \quad {\rm where} \ f_{21} = \frac{c_{t,2} V_{\phi, 2}}{c_{t,1} V_{\phi, 1}} = \rm const |
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