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December 02-03, 2019 | Dubai, UAE
Oil & Gas
2nd International Conference and Expo on
Journal of Industrial and Environmental Chemistry | Volume 3
The influence of the quality of deep samples on the results of studies of the phase
behavior of paraffins and formation oil asphaltenes
Stanislav Fedorovskiy
GAZPROM NEFT Science & Technology Centre, Russia
The paper illustrates the influence of the quality of
downhole samples on the results of studies of the phase
behavior of paraffins and asphaltenes in reservoir oil. The
results of studies of a conditionally representative sample of
reservoir oil and deep samples taken under multiphase flow
conditions (with different volumes of free gas, formation
water and solid phase of asphaltenes, resins and paraffins in
the sampler) were compared. For each sample, a set of PVT
studies was carried out according to all required standards
– PVT test, flash separation, determination of viscosity and
density. Phase behavior of paraffins and asphaltenes was
studied by methods of acoustic resonance (registration of
the moment of phase transition), high pressure microscopy
(determination of the number and geometric dimensions
of solid phase particles), gravimetric and filtration methods
(determination of the group composition of the solid phase).
To prepare samples of oil with free gas in the chambers,
a procedure was carried out to release free gas to the
current bubble-point pressure. The results of the analysis
revealed that the procedure of free gas release has little
effect on the PVT-characteristics of reservoir fluid samples.
However, it is not possible to study the phase behavior of
paraffins and asphaltenes, since the deviation of different
parameters reaches 70% (the content of asphaltenes, resins
and paraffins; paraffin saturation temperature; asphaltene
saturation pressure, etc.) As a result, the sample of fluids with
multiphase flow conditions, if it is impossible to use other
methods, may be acceptable for a standard PVT-analysis. But
it is not possible to study the phase behavior of paraffins and
asphaltenes for such samples, since these studies are highly
dependent on the quality of sampling.
Speaker Biography
Stanislav Fedorovskiy is the team leader of reservoir fluids studies of the
GAZPROM NEFT Science and Technology Center. By academic professional
education, he is a refinery engineer, but his career is all about studying
reservoir fluids. He worked as an engineer in a PVT-laboratory of one
of the research centers of PJSC Gazprom, where he mastered all the
fundamental knowledge and skills in the culture of working with downhole
and separator samples. Next, he became the head of the laboratory of
physical and chemical analysis of degassed (wellhead) samples in the
research center of JSC SibNIINP, having gained experience of research and
management of the team, he went to work directly at the GAZPROMNEFT
Science and Technology Center, where for 4 years he has made the way
from leading specialist to team leader. The specificity of their work lies in
the absolute diversity of properties and phase states of the fluid – from
heavy oil to supercritical fluids.
e:
Stanislav Fedorovskiy, J Ind Environ Chem, Volume:3
DOI: 10.35841/2591-7331-C3-014