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Sand Production Predictor

PRO

Predict sanding onset from drawdown pressure vs rock strength. Calculate critical drawdown and safe operating envelope.

Rock & Reservoir Properties

UCS - Unconfined Compressive Strength (psi)

Reservoir Pressure (psi)

BHP - Flowing (psi)

Overburden Stress (psi)

Biot Coefficient

Poisson Ratio

Current Drawdown

Critical Drawdown

TWC Strength (est.)

Sanding Risk

Recommendations

How this was calculated

Drawdown: DP = Pres - BHP.

TWC estimate: TWC ~ 0.4 x UCS (empirical correlation).

Effective stress at wellbore: Uses simplified Mohr-Coulomb with Biot effective stress and overburden loading.

Critical drawdown: DP_crit = UCS / (2 x (1 - Poisson) / (1 + Poisson)) - simplified for open-hole. Accounts for stress concentration at wellbore wall.

Risk: LOW if DP < 0.5 x DP_crit, MEDIUM if DP < 0.8 x DP_crit, HIGH if DP >= 0.8 x DP_crit.

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