Havlena-Odeh Reservoir Material Balance Calculator

Reservoir Material Balance: Calculate underground withdrawal ($F$), fluid expansions ($E_o, E_g$), drive indices ($DDI, SDI, WDI$), and original oil in place ($N$).

Production Data & Pressure Decline

Cumulative Oil $N_p$ (MMstb):

Cumulative Water $W_p$ (MMbbl):

Net Water Influx $W_e$ (MMbbl):

Gas Cap Size Ratio $m$:

PVT Properties (Initial vs Current)

Initial Oil FVF $B_{oi}$ (rb/stb):

Current Oil FVF $B_o$ (rb/stb):

Initial Gas FVF $B_{gi}$ (rb/scf):

Current Gas FVF $B_g$ (rb/scf):

Initial Solution GOR $R_{si}$ (scf/stb):

Current Solution GOR $R_s$ (scf/stb):

Material Balance & Drive Indices

Estimated OOIP ($N$)

-- MMstb

Current Recovery: -- %

Underground Withdrawal ($F$)

-- MMrb

Dominant: --

Drive Energy Breakdown

• Depletion (DDI): -- %

• Gas Cap (SDI): -- %

• Water Drive (WDI): -- %

Unit Expansions

E_o (Oil): -- rb/stb

E_g (Gas Cap): -- rb/stb

Net Water Support: -- MMrb

Havlena-Odeh Method:

• Linear form: $F = N [E_o + m E_g] + (W_e - W_p B_w)$. Solving for OOIP gives $N = \frac{F - (W_e - W_p B_w)}{E_o + m E_g}$.

• Total drive index must satisfy $DDI + SDI + WDI = 1.0$ (or $100\%$).

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Havlena-Odeh Reservoir Material Balance Calculator

Production Data & Pressure Decline

PVT Properties (Initial vs Current)

Material Balance & Drive Indices

Frequently Asked Questions