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Unconventional Reservoirs Calculators

Use 22 unconventional reservoirs petroleum engineering calculators with formulas, inputs, outputs, units, and source references.

Unconventional Reservoirs calculators group related upstream petroleum engineering formulas by workflow so engineers can find the right calculation faster.

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Reservoir EngineeringUnconventional Reservoirs

Adsorbed Gas in Place from Langmuir Isotherm

Ga=1359.7AhρbVLPPL+PG_a = 1359.7 A h \rho_b \frac{V_LP}{P_L+P}
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Reservoir EngineeringUnconventional Reservoirs

Adsorbed Gas Recovery Factor from Langmuir Pressures

RFads=1−Pab/(PL+Pab)Pi/(PL+Pi)RF_{ads} = 1 - \frac{P_{ab}/(P_L+P_{ab})}{P_i/(P_L+P_i)}
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Reservoir EngineeringUnconventional Reservoirs

Apparent Sorption Compressibility

cs=0.17525BgVLρBbLϕ(1+bLp)2c_s=\frac{0.17525B_gV_L\rho_Bb_L}{\phi(1+b_Lp)^2}
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Reservoir EngineeringUnconventional Reservoirs

Coal Mass from Area Thickness and Bulk Density

Mc=1359.7AhρbM_c = 1359.7 A h \rho_b
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Reservoir EngineeringUnconventional Reservoirs

Coalbed Methane Formation Compressibility

ct=WpWi(Pi−Pd)c_t = \frac{W_p}{W_i(P_i-P_d)}
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Reservoir EngineeringUnconventional Reservoirs

Communication Factor in a Compartment in Tight Gas Reservoirs

C=0.111924⋅k⋅AT⋅LC = 0.111924 \cdot \frac{k \cdot A}{T \cdot L}
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Reservoir EngineeringUnconventional Reservoirs

Correction Factor – Hammerlindl

CDI=G⋅Ef,wGp⋅BgCDI = \frac{G \cdot E_{f,w}}{G_p \cdot B_g}
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Reservoir EngineeringUnconventional Reservoirs

Dimensionless Time for Semi-Steady-State Coalbed Methane Flow

tDA=0.0002637kgtϕμgictiAt_{DA} = \frac{0.0002637 k_g t}{\phi \mu_{gi} c_{ti} A}
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Reservoir EngineeringUnconventional Reservoirs

Fractional Gas Recovery Below the Critical Desorption Pressure in Coal Bed Methane Reservoirs

RF=1−[(VmGc⋅b⋅P1+b⋅P)a]RF = 1 - \left[ \left( \frac{V_m}{G_c} \cdot \frac{b \cdot P}{1 + b \cdot P} \right)^a \right]
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Reservoir EngineeringUnconventional Reservoirs

Gas Adsorbed in Coalbed Methane Reservoirs

Ga=1359.7AhρbVG_a = 1359.7 A h \rho_b V
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Reservoir EngineeringUnconventional Reservoirs

Gas Solubility in Coalbed Methane Reservoirs

Rs=(0.17525ρBϕmSom)VR_s = \left(\frac{0.17525\rho_B}{\phi_m S_{om}}\right)V
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Reservoir EngineeringUnconventional Reservoirs

Hagoort and Hoogstra Tight Gas Compartment Flow

Q=Γ(P12−P22)2P1μg,avgBg,avgQ=\frac{\Gamma(P_1^2-P_2^2)}{2P_1\mu_{g,avg}B_{g,avg}}
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Reservoir EngineeringUnconventional Reservoirs

Langmuir Adsorbed Gas Content

Gc=VLPPL+PG_c = \frac{V_L P}{P_L + P}
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Reservoir EngineeringUnconventional Reservoirs

Langmuir Desorbable Gas Content Between Pressures

Gdes=VL(PiPL+Pi−PfPL+Pf)G_{des} = V_L\left(\frac{P_i}{P_L + P_i} - \frac{P_f}{P_L + P_f}\right)
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Reservoir EngineeringUnconventional Reservoirs

Payne Intercompartmental Gas Flow in Tight Gas Reservoirs

Q12=(0.111924kATL)[m(P1)−m(P2)]Q_{12}=\left(\frac{0.111924 k A}{T L}\right)\left[m(P_1)-m(P_2)\right]
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Reservoir EngineeringUnconventional Reservoirs

Remaining Gas in Place in Coalbed Methane Reservoirs

GR=7758AhϕEg[BwWp7758Ahϕ+(1−Swi)−(Pi−P)(cf+cwSwi)1−(Pi−P)cf]G_R = 7758Ah\phi E_g \left[ \frac{\frac{B_wW_p}{7758Ah\phi} + (1-S_{wi}) - (P_i-P)(c_f+c_wS_{wi})}{1-(P_i-P)c_f} \right]
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Reservoir EngineeringUnconventional Reservoirs

Somerton Formation Permeability in Coalbed Methane Reservoirs

k=ko[exp⁡(−0.003Δσko0.1)+0.0002(Δσ)1/3ko1/3]k=k_o\left[\exp\left(\frac{-0.003\Delta\sigma}{k_o^{0.1}}\right)+0.0002(\Delta\sigma)^{1/3}k_o^{1/3}\right]
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Reservoir EngineeringUnconventional Reservoirs

Tight Gas Pore Volume from Squared-Pressure Decline

PV=28.27Tμg,avgzavgμgicti(Pi2−Pwf2)qiDiPV=\frac{28.27T\mu_{g,avg}z_{avg}}{\mu_{gi}c_{ti}(P_i^2-P_{wf}^2)}\frac{q_i}{D_i}
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Reservoir EngineeringUnconventional Reservoirs

Tight-Gas Compartment Underground Withdrawal

F=GEg+WeF=GE_g+W_e
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Reservoir EngineeringUnconventional Reservoirs

Transmissibility Between Tight Gas Compartments

γ=γaγb(L1+L2)γaL2+L1γb\gamma=\frac{\gamma_a \gamma_b (L_1+L_2)}{\gamma_a L_2+L_1 \gamma_b}
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Reservoir EngineeringUnconventional Reservoirs

Transmissibility of a Tight Gas Compartment

γ=kAzμg\gamma=\frac{k A}{z \mu_g}
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Reservoir EngineeringUnconventional Reservoirs

Volume of Gas Adsorbed in Coalbed Methane Reservoirs

V=Vmbp1+bpV = \frac{V_m b p}{1 + bp}
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