Critical Rate (Coning) Calculator

Calculate critical coning rate using Meyer-Garder and Chaney correlations for water and gas coning.

Reservoir & Fluid Parameters

Oil Density, ρ_o (lb/ft³)

Water Density, ρ_w (lb/ft³)

Gas Density, ρ_g (lb/ft³)

Horizontal Perm, k_h (mD)

Vertical Perm, k_v (mD)

Oil Viscosity, μ_o (cp)

Oil FVF, B_o (rb/STB)

Net Pay, h (ft)

Perforation Height, h_p (ft)

Drainage Radius, r_e (ft)

Wellbore Radius, r_w (ft)

Meyer-Garder: q_c = 0.0246 × (10^-4) × k_h(ρ_w-ρ_o) / (μ_oB_o) × (h²-h_p²)

Water Coning Critical Rate (Meyer-Garder)

Gas Coning Critical Rate (Meyer-Garder)

Chaney et al. Correlation

Water Coning (Chaney)

Gas Coning (Chaney)

Additional Parameters

k_v/k_h Ratio

h_p/h Ratio

Δρ (w-o)

How this works

Meyer-Garder (1954): q_c = 0.0246e-4 × k_h(Δρ)/(μ_oB_o) × (h² - h_p²). Assumes vertical equilibrium and radial flow. Conservative estimate.

Chaney et al. (1956): q_c = 0.0783e-4 × k_h(Δρ)/(μ_oB_o) × h × (h - h_p) / ln(r_e/r_w). Accounts for drainage area geometry.

Critical rate is the maximum production rate before the water/gas cone breaks through to the perforations. Producing above this rate leads to water or gas breakthrough.

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