Critical Gas Water Coning Rate Calculator

Production Geomechanics: Calculate maximum water-free and gas-free critical production rates ($q_c$) in vertical oil wells using Schols & Chierici models.

Pay Zone & Perforation Geometry

Oil Column Thickness $h$ (ft):

Perforated Interval $h_p$ (ft):

Top of Perfs Depth $D_p$ (ft):

Drainage Radius $r_e$ (ft):

Rock & Fluid Densities

Horizontal Perm $k_h$ (mD):

Oil Viscosity $\mu_o$ (cp):

Water Specific Gravity $\gamma_w$:

Oil Specific Gravity $\gamma_o$:

Oil FVF $B_o$ (rb/stb):

Critical Coning Rate & Stability

Critical Water Rate ($q_{c,w}$)

-- stb/day

Schols Formulation

Critical Gas Rate ($q_{c,g}$)

-- stb/day

Gas Cap Coning Limit

Density Contrast ($\Delta\rho$)

-- g/cm³

Gravity stabilizing force

Perforation Standoff

-- ft

Perforated ratio: -- %

Coning Physics:

• Viscous pressure drawdown pulls water/gas towards wellbore against stabilizing hydrostatic buoyancy forces.

• Exceeding $q_c$ creates an unstable cone breakthrough, dramatically escalating water cut or GOR.

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Critical Gas Water Coning Rate Calculator

Pay Zone & Perforation Geometry

Rock & Fluid Densities

Critical Coning Rate & Stability

Frequently Asked Questions