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LaTeX Math Block
anchorQMB6Z
alignmentleft
p(t) = p_0 + \int_0^t p_u(t-\tau) \, dq(\tau) = p_0 + \int_0^t p_u(t-\tau) \, \dot q(\tau) \, d\tau 

where

LaTeX Math Inline
bodyp_0

initial formation pressure at zero time

LaTeX Math Inline
bodyt=0

LaTeX Math Inline
bodyp_u(\tau)
Drawdown Transient Response

LaTeX Math Inline
body\dot q(\tau) = \frac{dq}{d\tau}


a pace of sandface flow rate variation per unit time



In case a well is interfering with the offset wells the pressure in a given well  

LaTeX Math Inline
bodyn
 may respond to the offset wells 
LaTeX Math Inline
bodym \neq n
 and the multi-well form of convolution is going to be:

LaTeX Math Block
anchorpwf
alignmentleft
p_n(t) = p_{n, 0} + \sum_{m=1}^N \int_0^t p_{u,nm}(t-\tau) \, dq_m(\tau) = p_{n, 0} + \sum_{m=1}^N \int_0^t p_{u,nm}(t-\tau) \, \dot q_m(\tau) \, d\tau = p_{n, 0} + \int_0^t p_{u,nn}(t-\tau) \, \dot q_n(\tau) \, d\tau + p_{n, 0} + \sum_{m \neq n}^N \int_0^t p_{u,nm}(t-\tau) \, \dot q_m(\tau) \, d\tau

where

LaTeX Math Inline
bodyp_{n, \, 0}

Initial formation pressure at zero time

LaTeX Math Inline
bodyt=0
for the
LaTeX Math Inline
bodyn
-th well

LaTeX Math Inline
bodyp_{u,nm}(\tau)

Drawdown Transient Response in the

LaTeX Math Inline
bodyn
-th well to the unit-rate production


LaTeX Math Inline
bodyp_{u,nm}(\tau)



Cross-well Transient Response
in the

LaTeX Math Inline
bodyn
-th well to the unit-rate production in
LaTeX Math Inline
bodym
-th well


LaTeX Math Inline
body\dot q_m(\tau) = \frac{dq_m}{d\tau}


A speed of

LaTeX Math Inline
bodyn
-th well total sandface flow rate variation


See also

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See Also

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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing

Well & Reservoir Surveillance ] [ Pressure Diffusion ] [ Pressure drawdown ]

Convolution @math ]