Iraqi Journal of Chemical and Petroleum Engineering

The solution gas-oil ratio is an important measurement in reservoir
engineering calculations. The correlations are used when experimental PVT data from
particular field are missing. Additional advantages of the correlations are saving of
cost and time.
This paper proposes a correlation to calculate the solution gas -oil ratio at
pressures below bubble point pressure. It was obtained by multiple linear regression
analysis of PVT data collected from many Iraqi fields.
In this study, the solution gas-oil ratio was taken as a function of bubble point
pressure, stock tank oil gravity, reservoir pressure, reservoir temperature and relative
gas density.
The construction of the new correlation is depending on thirty seven PVT
reports that were collected from Iraqi fields.
Statistical and graphical tools have been used to check the performance of the
correlation. Correlation performance was also compared with previous published
correlations.
The values of solution gas - oil ratio that were calculated from the new
correlation have high accuracy when they were compared with the original laboratory
data. Also, the results of the new correlation show high precision when compared
with Standing [1], Vasquez and Beggs [2], Glaso [3], Al-Marhoun [4], Petrosky and
Farshad [5], Kartoatmodjo and Schmidt [6], Velarde, Blasingame and McCain [7] and
Mazandarani and Asghari [8] correlations.

The catalytic activity of faujasite type NaY catalysts prepared from local clay (kaolin) with
different Si/Al ratio was studied using cumene cracking as a model for catalytic cracking process in
the temperature range of 450-525° C, weight hourly space velocity (WHSV) of 5-20 h1
, particle size
≤75µm and atmospheric pressure. The catalytic activity was investigated using experimental
laboratory plant scale of fluidized bed reactor.
It was found that the cumene conversion increases with increasing temperature and decreasing
WHSV. At 525° C and WHSV 5 h-1
, the conversion was 42.36 and 35.43 mol% for catalyst with 3.54
Si/Al ratio and Catalyst with 5.75 Si/Al ratio, respectively, while at 450° C and at the same WHSV,
the conversion was decreased to 29.15 and 21.86 mol% respectively, and the catalyst of 5.75 Si/Al
ratio gave the higher cumene activity than the catalyst with 3.54 Si/Al ratio.

A particular solution of the two and three dimensional unsteady state thermal or
mass diffusion equation is obtained by introducing a combination of variables of the
form,
η = (x+y) / √ct , and η = (x+y+z) / √ct, for two and three dimensional equations
respectively. And the corresponding solutions are,
θ t, x, y = θ0 erfc x+y
√8ct
and θ t, x, y, z = θ0 erfc
x+y+z
√12ct