welltest_pta.reservoir_parameters

welltest_pta.reservoir_parameters(slope_m, p_1hr, p_wf_at_shut_in, q, mu, B, h, phi, ct, rw, early_storage_slope=None)[source]

Compute \(kh\), \(k\), \(S\), and (optionally) \(C\).

Parameters:

slope_m (float) – Semilog slope (psi/cycle) — magnitude doesn’t matter, sign is handled internally.
p_1hr (float) – Pressure at \(\Delta t = 1\) hr on the IARF straight line (psi). For Horner: \(p_{1\text{hr}} = m \log_{10}(t_p+1)+P^*\). For MDH: just the intercept.
p_wf_at_shut_in (float) – Flowing pressure at the instant of shut-in (psi). Skin is computed from \((p_{1\text{hr}} - p_{wf})\).
q (float) – Flow rate (STB/D for oil — convert gas to its own equation).
mu (float) – Viscosity (cp).
B (float) – Formation volume factor (RB/STB).
h (float) – Net pay (ft).
phi (float) – Porosity (fraction, 0–1).
ct (float) – Total compressibility (1/psi).
rw (float) – Wellbore radius (ft).
early_storage_slope (Optional[float]) – Optional — \(d\Delta p/dt\) at very early time (psi/hr). If provided, wellbore storage \(C\) (bbl/psi) is also returned.

Return type:

dict[str, float]

Returns: