Name: PEDRO HENRIQUE VIDAL AGUIAR
Publication date: 27/10/2022
Advisor:
Name |
Role |
|---|---|
| OLDRICH JOEL ROMERO | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| OLDRICH JOEL ROMERO | Advisor * |
| TAISA SHIMOSAKAI DE LIRA | Internal Examiner * |
Summary: In the Exploration and Production stage of the oil industry, the natural gas flow
measurement systems must operate with a temperature higher than the dew point
temperature or, otherwise, the natural gas will condense inside the gas pipelines and,
in addition to causing increased corrosion and wear in piping and equipment, it can
cause the flow measurement to be oversized. This phenomenon of overreading has a
direct impact on the total gas production and, consequently, on the distribution of
royalties. The most employed equations to estimate overreading use the LockhartMartinelli parameter. However, for real-time monitoring, the use of this parameter
becomes complex, as it requires knowledge of the mass flows of liquid and gas and
their respective relative densities, and such parameters are difficult to determine when
they occur together with the gas and for small amounts of liquid. Thus, the objective of
the present work is to analyze orifice plate-type measurement systems flowing wet
natural gas through the correlations of Murdock (1962), Chisholm (1977), Lin (1982)
and Separated Flow Model (1982) and in the development of overreading equations
based on the pressure and temperature of the measurement system. For this, real data
of pressure, temperature, molar composition of ten measuring systems of natural gas
were simulated in the software DWSIM® 8.0.4 Chemical Process Simulator for
construction of the dew curves and definition of properties of the gas and liquid
fractions and later analyzed in SigmaPlot® 14.5 software, used to determine surface
and contour plots, as well as overreading equations as a function of pressure and
temperature. The results obtained show that the four correlations chosen in this work
increase linearly with the increment of the Lockhart-Martinelli parameter and the liquid
volume fraction and decrease linearly with the decrement of the quality and gas
volume fraction and that the overreading increases with the reduction of the
temperature and with the increase of the pressure, being the Chisholm's model (1977)
which presents the highest values and the Separated Flow Model (1982) the lowest
values of overreading.
