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LaTeX Math Inline
bodyt

time since the water injection rate has changed by the 

LaTeX Math Inline
body\delta q_2
value.

LaTeX Math Inline
bodyp_{u,\rm 21}(t)

cross-well pressure transient response (CTR) in producer W1 to the unit-rate production in injector W2

LaTeX Math Inline
bodyp_{u,\rm 11}(t)

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 

LaTeX Math Inline
body V_{\phi} < \infty
 the flowrate response factor 
LaTeX Math Inline
body\delta q_1 / \delta q_2 = f_{21} = \rm const
is constant:

LaTeX Math Block
anchorCase2_PSS
alignmentleft
\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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