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Unconventional Reservoirs Equations

Browse 22 unconventional reservoirs petroleum engineering equations with formulas, inputs, outputs, units, and sources.

Unconventional Reservoirs equations 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

G_a = 1359.7 A h \rho_b \frac{V_LP}{P_L+P}

Reservoir EngineeringUnconventional Reservoirs

Adsorbed Gas Recovery Factor from Langmuir Pressures

RF_{ads} = 1 - \frac{P_{ab}/(P_L+P_{ab})}{P_i/(P_L+P_i)}

Reservoir EngineeringUnconventional Reservoirs

Apparent Sorption Compressibility

c_s=\frac{0.17525B_gV_L\rho_Bb_L}{\phi(1+b_Lp)^2}

Reservoir EngineeringUnconventional Reservoirs

Coal Mass from Area Thickness and Bulk Density

M_c = 1359.7 A h \rho_b

Reservoir EngineeringUnconventional Reservoirs

Coalbed Methane Formation Compressibility

c_t = \frac{W_p}{W_i(P_i-P_d)}

Reservoir EngineeringUnconventional Reservoirs

Communication Factor in a Compartment in Tight Gas Reservoirs

C = 0.111924 \cdot \frac{k \cdot A}{T \cdot L}

Reservoir EngineeringUnconventional Reservoirs

Correction Factor – Hammerlindl

CDI = \frac{G \cdot E_{f,w}}{G_p \cdot B_g}

Reservoir EngineeringUnconventional Reservoirs

Dimensionless Time for Semi-Steady-State Coalbed Methane Flow

t_{DA} = \frac{0.0002637 k_g t}{\phi \mu_{gi} c_{ti} A}

Reservoir EngineeringUnconventional Reservoirs

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

RF = 1 - \left[ \left( \frac{V_m}{G_c} \cdot \frac{b \cdot P}{1 + b \cdot P} \right)^a \right]

Reservoir EngineeringUnconventional Reservoirs

Gas Adsorbed in Coalbed Methane Reservoirs

G_a = 1359.7 A h \rho_b V

Reservoir EngineeringUnconventional Reservoirs

Gas Solubility in Coalbed Methane Reservoirs

R_s = \left(\frac{0.17525\rho_B}{\phi_m S_{om}}\right)V

Reservoir EngineeringUnconventional Reservoirs

Hagoort and Hoogstra Tight Gas Compartment Flow

Q=\frac{\Gamma(P_1^2-P_2^2)}{2P_1\mu_{g,avg}B_{g,avg}}

Reservoir EngineeringUnconventional Reservoirs

Langmuir Adsorbed Gas Content

G_c = \frac{V_L P}{P_L + P}

Reservoir EngineeringUnconventional Reservoirs

Langmuir Desorbable Gas Content Between Pressures

G_{des} = V_L\left(\frac{P_i}{P_L + P_i} - \frac{P_f}{P_L + P_f}\right)

Reservoir EngineeringUnconventional Reservoirs

Payne Intercompartmental Gas Flow in Tight Gas Reservoirs

Q_{12}=\left(\frac{0.111924 k A}{T L}\right)\left[m(P_1)-m(P_2)\right]

Reservoir EngineeringUnconventional Reservoirs

Remaining Gas in Place in Coalbed Methane Reservoirs

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]

Reservoir EngineeringUnconventional Reservoirs

Somerton Formation Permeability in Coalbed Methane Reservoirs

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]

Reservoir EngineeringUnconventional Reservoirs

Tight Gas Pore Volume from Squared-Pressure Decline

PV=\frac{28.27T\mu_{g,avg}z_{avg}}{\mu_{gi}c_{ti}(P_i^2-P_{wf}^2)}\frac{q_i}{D_i}

Reservoir EngineeringUnconventional Reservoirs

Tight-Gas Compartment Underground Withdrawal

F=GE_g+W_e

Reservoir EngineeringUnconventional Reservoirs

Transmissibility Between Tight Gas Compartments

\gamma=\frac{\gamma_a \gamma_b (L_1+L_2)}{\gamma_a L_2+L_1 \gamma_b}

Reservoir EngineeringUnconventional Reservoirs

Transmissibility of a Tight Gas Compartment

\gamma=\frac{k A}{z \mu_g}

Reservoir EngineeringUnconventional Reservoirs

Volume of Gas Adsorbed in Coalbed Methane Reservoirs

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