NATURALLY FRACTURED RESERVOIRS
YEAR 2008
WELCOME TO OUR HOME
WE SPECIALIZE IN THE STUDY OF NATURALLY FRACTURED RESERVOIRS WORLDWIDE
“The
model presented in this paper leads to what we are calling the “2030 1/3
forecast”. It indicates that global energy needs will be met by
approximately 1/3 of liquids, 1/3 of solids and 1/3 of gases by 2030… If
there is a supply problem in the near future, it will not be the result of
depletion, but rather the failure of society to invest in the research and
development of technology needed to provide conventional oil and gas, as well
as alternatives, on a timely basis.” Roberto F. Aguilera and Roberto
Aguilera, SPE paper 110215 (November 2007), Journal of Petroleum Technology
(May 2008).
“Historically,
non-fractured aquifers have been attached to material balance calculations of
naturally fractured reservoirs. This is not realistic from a geologic point of
view as it implies that fractures are present in the oil portion of the
reservoir, but disappear the moment the water oil contact is reached. It is
shown that the use of an unfractured aquifer in a naturally fractured reservoir
can lead to erroneous oil recovery estimates.” Roberto Aguilera, Journal
of Canadian Petroleum Technology (July 2007).
“Historically,
compressibility has been neglected when carrying out material balance
calculations of conventional reservoirs producing below the bubble point. This
assumes that the reservoir strata are static. It is shown, however, that under
some conditions, fracture compressibility can have a significant impact on oil
rates and recoveries of naturally fractured reservoirs as the fracture
permeability and fracture porosity are stress-dependent.” Roberto Aguilera,
Journal of Canadian Petroleum Technology (December 2006).
“The
underlying but important message is never to overlook low-porosity intervals in
naturally fractured reservoirs. It is safer not to use porosity as a cutoff
criterion in fractured reservoirs, particularly in exploration wells, unless
there is some solid supporting information that asserts the opposite. The use
of a porosity cutoff can leave as undiscovered a reservoir that, if tested,
could prove to be commercial.” Roberto Aguilera, AAPG Bulletin
(May 2006).
“In
addition to rock fabric, it is possible to have in a Pickett plot, water
saturation, capillary pressure, pore throat aperture, Kozeny’s constant,
permeability, process speed, and height above the free water table. The
integration of these geologic, petrophysical and reservoir engineering
properties permits determination of flow units and a more rigorous
characterization of carbonate reservoirs. The method helps to reconcile geology
to fluid flow.” Roberto Aguilera, AAPG Bulletin (April 2004).
“There
are instances where the reservoir is composed mainly of matrix, fractures and
non-connected vugs. In these cases a triple porosity model appears more
suitable for petrophysical evaluation of the reservoir. A new technique is
presented for these types of reservoirs that is shown to hold for all
combinations of matrix, fracture, and non-connected vug porosities.”
Roberto F. Aguilera and Roberto Aguilera, Petrophysics (March-April
2004).
"If
total porosities and resistivities of the composite system are used on a
Pickett plot when the partitioning coefficient (v) is constant, then the usual
straight lines for fixed values of water saturation are not obtained. In this
case, the Pickett plot results in downward concave lines. Not recognizing this
effect might lead to significant errors in the calculation of water
saturation." Roberto Aguilera, Journal of Canadian Petroleum Technology
(December 2003).
"Ultimately,
the simulation indicated that by producing the largest possible amount of water
from the wells in the north and the south of the structure that had been killed
by water, the field would be saved and the ultimate gas recoveries would be
increased." R. Aguilera, J. J. Conti and
"We
have found that some of the models for non-connected vugs fail for certain
combinations of matrix and non-connected vug porosities. The reason for the
failures is an improper scaling of the matrix porosity." Maria S. Aguilera
and Roberto Aguilera, Petrophysics (Jan-Feb 2003).
SERVIPETROL
Techniques
for evaluation of dual and triple porosity reservoirs, flow units, rock fabric,
pore throat aperture, permeability, capillary pressure, and height above the
free water table are incorporated in Servipetrol's Fracture Completion Log. The
techniques were published recently by Dr. Roberto Aguilera in leading
scientific journals of the oil and gas industry.
The
scope of projects undertaken range from brief informal discussions with
clients, to detailed, fully documented, comprehensive studies. Our final reports
include definitive conclusions and recommendations. We can work in conjunction
with client geologists and engineers or we can develop completely independent
studies.
Training Services (Year 2008)
Industry-Related
Links
- Naturally Fractured
Reservoirs
- APEGGA
(ALBERTA, CANADA)
- Society
of Petroleum Engineers (SPE)
- Canadian
Well Logging Society (CWLS)
- The
Petroleum Society of CIM
- Canadian
Society of Petroleum Geologists (CSPG)
- American
Association of Petroleum Geologists (AAPG)
- H.
K. van Poollen
For
comments, suggestions, or questions please email: aguilera@servipetrol.com
NUMBER OF VISITORS
Ph. (403)2662535, Fax (403)2648297
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2008 Copyright by Servipetrol Ltd. All rights reserved.