equilibrium @ DP line vapor and 2 phase are in equilbiruim True Critical point of a mixture
DP
is - than of a ciritical point of a pure substance higher Critical temp of a mixture is -than
-than of a pure substance higher at the cricondenbar no - forms ga
What happens to the reservoir pressure in a depletion drive?
happens to the gas oil ratio in a depletion drive?
declines rapidly
increasing rapidly
What happens to the oil recovery in a depletion drive?
5-30%
What happens to the reservoir pressure in a ga
calculation iterative viscosity cal 1. CKB
viscosity
CKB
numerical
dempsey
Lee
2.numerical tech ( dempsey and LGE - Lee Gonzales Eakin)
data used for these tech are (Ppr,Tpr, Ma, gamma g) use of z factor for 1. gas volume and gas
data
use
reserve cal
2. d
condesate systmes. inert gases N2 sour gases H2S, CO2 to measure z factor besides the
to
correlations one can use the EOS , which are 1. van der walls
correlations
2.soarc Redlick Kwong (SRK)
3.Redlick Kwong (RK)
Redlick
4. Peng robinson (PR)
Peng
5.Viria
brown to dark green triple point where liquid, solid and gas can coexist critical point above
brown
triple
where
critical
which the intensive properites of the vapor and liquid are teh same how calculate mixture
which
properties? Kays mixing rule Kay's mi
principles deriving teh Fundental eq of flow 1. need a consitiute equation -darcy's law
principles
2. need a momnetu equation ( newton 's 2nd law) written in teh form of force balance
need
newton nd
teh
3. Continuity equation( mass balance ) [massin]-[mas
It has to be large enough , to be repreentative representative elemental volume (REV);
to
representative
domain of continuity Assumtion in fundemental equation of flow ( continuity eqution)
domain
Assumtion
1)isothermal conditions prevail, other wise need
Resrv Engr Applications water drive resrvoir, case histories, simulation standard conditions (
Resrv
water
standard
SPE) 60 F and 15.56 C , 1 ATM and 14.6967 psia Standard Conditions ( IUPAC) 0 C and
itions
273.15 K, 1 Bar and 14.5038 psia Pressure [M/LT^
Resrv Engr Applications water drive resrvoir, case histories, simulation standard conditions (
Resrv
water
standard
SPE) 60 F and 15.56 C , 1 ATM and 14.6967 psia Standard Conditions ( IUPAC) 0 C and
itions
273.15 K, 1 Bar and 14.5038 psia Pressure [M/LT^
PVT props ( use of EOS- equation of state and correlations, z-factor, density, resistivity)
equation
factor,
Theory of fluid flow in porous media reservoirs with incompressible fluids(formation water),
reservoirs
slightly compressible ( oil), compressible
SIMULATION=historical matching, modeling (grids and boundries),governing
SIMULATION=historical
equations(1.diffusivity eq and darcys law ), steady and unsteady state flow, predict future
diffusivity
predict
performance under diff situations OPEC assigns q
Definitions
Definitions
Res Engr is a branch of petr engr that is typically concerned w recovering the max amount of
Res
oil & gas (HC) w the min cost incurred & in an environmentally responcible manner reserve
oil
estimates used by financial organization
At the seprator conditions some oil is produced Dry gas GOR >100,000 Boyles law
At
Dry
Boyles
PV=constant Charles law PT= constat Ideal Gas law PV/T=constant, PV=nRT z gas
Ideal
PV/T=constant,
compressibility factor, gas supercompressiblidty , gas deviati
Comp-12-20% C7+, >35% C3 -C6, Rest C1 Gas Reservoir types 1. Retrograde gas
Condensity REs
Condensity
2. near Critical poin GAs
near
3. Wet gas Retrograde gas condensate acts in a retrograde fusion and same quility line twice
Wet
Retrograde
acts
GOR 8000-
GOR<200
200
Bo<1.2
API < 35 High Shrinkage (volatile) oil Gravity lines are closer together near the BP line
35 High
Gravity
GOR 2000-3200
2000
Bo<2
API 45-55 Near Critical Crude oil Huge Shrinkage of oil 100%-50% for a small drop in res
Near
Huge
100%
pr
1. Lab data (Hg based PVT cells and Hg- free PVT systems)
Hg
2.Correlations
3.Equations of State-(Van der walls and virial EOS) Low Shrinkage oil gravity lines are
(Van
Low
closely spaced near the dew point line
closely
B)saturated oil reservoir
B)saturated
C)gas cap reservoir Types of reservoir can be called 1.ordinary black oil
C)gas
Types
.ordinary
2.low shrinkage oil
low
3. High shrinkage oil
High
4.Near critical crude oil as density goes up the API gravity - goes do