In many practical cases the pore compressibility can be considered as poorly dependent on reservoir pressure variation:
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body | c_r(p) = c_r = \rm const |
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.But in case the reservoir pressure is changing substantially one may need to account for the effect it takes on pore compressibility.
The model is usually relates Empirical crrelation between pore compressibility
at to a given pressure
and
initial pore compressibility at
initial formation pressure :...
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anchor | Dobrynin |
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alignment | left |
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| \displaystyle c_r(p) = c_{ri} \cdot \frac{ \ln \left( \frac{ p_n }{p_{\rm max}} \right) }{ \ln \left( \frac{p_{ni}}{p_{\rm max}} \right) } |
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| p_n = p_{\rm min} + 1.75 \cdot \phi^{0.51} \cdot (p_{\rm max} - p) |
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| p_{ni} = p_{\rm min} + 1.75 \cdot \phi^{0.51} \cdot (p_{\rm max} - p_i) |
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Dobrynin | Wide pressure range: pmin = 1 MPa < p < pmax = 200 MPa |
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See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics / Geomechanical Rock Modelling / Pore compressibility
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