1. University of Technology
Petroleum Technology Department
Calculation of OOIP by static and dynamic
models and prediction of reservoir pressure
2015 A.C. 1436 A.H.
2. The contour map
• The contour map of Buzurgan oil field is a special case
of the topographic map which include, in Basic contours
line and therefore show the surface of the Earth in three
dimensions .
• Contour maps were drawn for three units of Buzurgan
oil field which are MB21, MC1, and MC2.
4. Cut-off
• Cutoff is one of most important petro physical properties used to
determine the net pay zone of reservoir rocks.
• there are several types of cutoff such as (porosity cut off ,SW cut off
,permeability cut off etc. ) .
• there are two methods to determine porosity cut off first method is
by plotting (log permeability vs porosity percent ) second is
statistical method .statistical method is better than first method.
• The cut off determination depended on the coring operation, where
the cores collected from all formation that the well pass through,
then determine all petro-physical properties of this cores.
5. Porosity cutoff: pores with porosity less than cutoff value
are non-reservoir rock.
SW cutoff: pores with SW greater than cutoff values are
non-reservoir rock.
Permeability cutoff: pores with permeability less than
cutoff value are non-reservoir rock.
Properties of production zone should be:
Porosity >cutoff
Permeability>cutoff
Water saturation<cutoff
9. Phi log vs phi core correlation
There are two way to find porosity from log(CPI) or from
core analysis , logs give more information about porosity
than from core , and at this time companies used logs
because its need little cost and time than core.
Drawing core porosity vs log porosity percent of Mishrif
formation to determine correlations between them , to
know or determine permability core from porosity log at
depth that not contain core data ( only log data)
10.
11. Then plot was drawn between k core and phi core to obtain
equation , in this equation we applied the phi core predict
to obtain k log.
12. PVT
Pressure Volume Temperature tests, PVTB is important that
gives properties of crude oil in the reservoir fluid properties
include:
1- viscosity "μ"
2- oil formation volume factor "BO"
3- compressibility "C"
4- density "ρ"
5- gas oil ratio "GOR"
• It is necessary for characterizing these fluids and evaluating
their volumetric performance at various pressure levels.
• And we can draw these properties versus the pressure to
estimate the fluid properties for the reservoir by unitizing a
typical curve explaining each fluid property with the
pressure.
16. Original Oil In Place:
Original oil in place is very important
that evaluation economic value of the
field, that calculate in static and
dynamic model.
17. Static model
The static model is a volumetric method to
calculate the original oil in place in the
reservoir at static condition before the
production and fluids flow and it used to
calculate the volume by a volumetric
method without any production or fluid
properties data.
PETREL a software used to calculate the
original oil in place. And it used to convert
seismic data to simulation.
26. Dynamic model
Dynamic reservoir modeling: The objective of
reservoir modeling is to build a numerical model
able to simulate the dynamic behavior of a given
hydrocarbon reservoir. The purposes of the model,
once built and calibrated, are various: estimate
system parameters, forecast the field productivity
according to different development scenarios and
learn more about specific phenomena
30. j-function
J-function is a dimensionless function of water saturation
describing the capillary pressure.
J-function benefit
find capillary pressure
reduce scatter
to find oil water contact.
in equation of j-function depend on capillary pressure,
permeability, porosity , and saturation obtain from special
core analysis. to find capillary pressure that draw between
saturation and j-function and assume the value of
saturation and crossing with curve read j-function
31. Perforation
is one of the most important in stimulation include
matching it is affected on the result
the step to do that :well engineering >>>well complete
design >>>from toolbar(add perforation >>>choose the
depth of perforation
32. History Matching
Matching is a method that provide a powerful
method for analyzing pressure drawdown (flow)
and buildup tests. Fundamentally, type curves are
pre plotted solutions to the flow equations, such as
the diffusivity equation, simulation history
matching including (pressure matching , water cut
matching and production matching.
