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47 Cards in this Set
- Front
- Back
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Challenges of res engr
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1. Know the res. and model it properly
2. Understanding fftpm eqs 3. " " fluid properties 4. " " material balance 5. " " natural drive mechs and augmented 6. make forecasts 7. suggest ways for EOR |
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Steady State laplace equation
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d^2P/dx^2 + d^2P/dy^2=0
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Unsteady state eq
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d^2P/dx^2 + d^2P/dy^2=(1/alpha)(dP/dt)
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Darcy's Law
What is C? |
q= k A dP/ mew L
c=coefficient of conversion |
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API
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Measurement of gravity (density)
API= 141.5/SG - 131.5 |
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Crude Oils
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Alkanes
Cyclic--- cyclohexane.... aromatic--- benzene |
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Largest Oil Field
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Ghawar Field
active water flooding program to maintain pressure |
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Gas Laws
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1. Boyle's Law
2. Charles Law--- PT=const 3. Ideal gas law--- PV/T= const |
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gas constant R for field units
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R=10.730 psia ft^3 / (lb-mole) R
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Mixing Rules
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Kays Mixing Rule
--use correlations if gas grav>.75 |
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impurity corrections
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Carr-Kobayashi-Burrows (for all)
Wichert-Aziz (absence of N2) |
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Cubic EOS
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Van Der Waals
Soave-Redlich-Kwong Peng-Robinson Peneloux correction for SRK and PR |
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(omega)
BIC |
omega= composition eccentricity factor
BIC= Binary Interaction Coefficient |
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More EOS
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Virial
Benedict-Webb-Rubin Lawal-Lake-Silberberg |
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LGE
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Lee Gonzalez Eakins
bad for high co2 good for H2S up to 2500 psi |
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What natural gas property can be obtained by using Trube's charts?
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compressibility
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isothermal compressibility of a real gas in terms of pressure and z factor in differential form
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Cg=1/P-1/z(dz/dp) (sub) T
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what is C7+
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Heavy hydrocarbon fraction
includes C7 |
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Three coordinate systems for fftpm
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radial cylindrical
radial spherical linear |
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Domain for smaller samples than those in domain of continuity
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microscopic domain
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constitutive equation for deriving the fftpm
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Darcy's Law
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The finite difference method can be used to do numerical differentiation of a function
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true
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the gas formation volume vactor in reservoir ft^3/scf is given by the expression Bg=0.02827 ZT/p
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true
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In an inverse problem the input and output are known but the system is unknown
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true
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The term (phi*mew*c/k) is what
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1/alpha
alpha=hydraulic diffusiity |
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Types of Oil
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Ordinary black oil
low shrinkage oil high shrinkage oil Near critical oil |
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Types of Gas
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Retrograde Gas
Near Critical Gas Wet Gas dry Gas |
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Gas density in terms of pressure, molecular weight, R and T
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rho(g)=PM/RT
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parameters for radial-cylindrical system
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r, theta, z
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parameters for radial-spherical system
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r, theta, alpha
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REV
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representative elemental volume
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isotropic and homogeneous reservoir
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kx1=kx2=kx3=ky1=ky2=ky3
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isotropic but hetero reservoir
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kx1=ky1 but
kx1=/= ky2 |
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anisotropic and homo reservoir
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kx1=kx2
but kx1 =/= ky1 |
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anisotropic but hetero
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kx1 =/= kx2 and
kx1 =/= ky1 |
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Darcy's law for radial cylindrical
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Qr=-(k/mew)(dp/dr)
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expression for psuedo pressure (psi)
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=2*int(0-p)(p/mew/z)dp=2A
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The value of the pseudo pressure function is usually calculated using a numerical integration technique
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true
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Simple analytical solution of the equation of fluid flow through a res is possible if one makes the assumption of isotropic and homogeneous reservoir
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true
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it is better to use the pseudo pressure approach for solving gas flow eqs in all three regions because most reservoirs dont fall within regions I and III
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True
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in the gas flow expression using the p-approach the gas viscosity and the gas compressibility are evaluated at the initial pressure
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false
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the dimensionless radius at any point in the reservoir is calculated by dividing rw (well radius) by its distance from the center of the well
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false
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for slightly compressible liquids the following expression is used for compressibility c=1/p(drho/dp)
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true
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Riazi and Daubert correlation is used to get critical properties of mixtures for which only molecular weight and density are known
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True
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the pseudo critical temperature of a mixture of HC gas will be greater than any individual Tc value of a gas present in the mixture
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false
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the pseduo critical pressure of a mixture of HC gas will be less than any individual Pc value of a gas present in the mixture
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false
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the Sarem correlation uses an iterative technique to calculate the z factor
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true
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