Executive Editors of
Evaluation & Engineering alternate writing the Executive Summary.
This issue's summary is by Behrooz Fattahi.
This is my first column as the
co-Executive Editor of SPEREE. It is my pleasure to be involved with the
peer-review process and to be associated with the distinguished team of
volunteer editors and the fine SPE staff who collectively make this process a
You all know that the peer-review process
is perhaps the most important function of SPE, placed at the heart of its
mission of dissemination of knowledge. Realizing the importance of this process
burdens us with the great responsibility of preserving the high quality of the
published papers as well as the timely delivery of reviews to expedite the
transfer of ideas and knowledge from inception to application. Our process
statistics show that in the past few years, we have improved the review-cycle
time. However, we still can go a long way in this direction without having to
sacrifice the quality of the journal, and that we must. My goal in the next 2
years will be to accomplish this.
Last November, I asked each of the 120
Technical Editors of the Reservoir Engineering portion of this journal to
formally commit themselves to review three to five papers in 2007; 75 of the
editors responded positively to my call. Since then, I have increased the
number of Review Chairs and at the same time reduced the number of Technical
Editors in each review team to eight members. This change should allow Review
Chairs to carry a lighter load while increasing their focus on the quality of
approved papers and the timely delivery of their decisions.
The editors in the peer-review process
have determined that they can afford allocating some of their time and effort
to this critical SPE function. With this clear commitment from the team, I
intend to use this energy to improve the process. In the meantime, I need your
help in building up the number of volunteer editors. I am looking for more
qualified people who can commit to reviewing three to five papers in 2007.
Other activities are also underway to optimize the process of peer review, and
I will report on these in due course.
This issue of the journal brings you 10
The first paper, by Gozalpour, Danesh,
Todd, and Tohidi, presents the results of an investigation of the impact of
oil-based mud-filtrate contamination on various types of reservoir-fluid
samples. The authors propose a tracer-based technique to determine the original
composition of reservoir fluids from contaminated samples.
The second paper, by Stalder, presents
the results of a numerical-simulation study of Cross SAGD on mobilizing bitumen
and achieving a significant rate and thermal-efficiency advantage over the
conventional SAGD method, particularly at lower reservoir pressures. The author
also discusses the disadvantages of Cross SAGD application in narrow
sand-channel developments as well as potential operational
In the third paper, Gates et al. use
numerical-simulation modeling in search of a SAGD strategy to maximize
steam/oil ratio in reservoirs with top gas. They propose high initial chamber
injection rates prior to the chamber’s contact with the gas cap, reducing it
only after breakthrough to minimize convective heat losses.
The fourth paper, by Osterloh and
Menard, offer a methodology to overcome the challenges involved in decision
making for optimized expansion of heavy-oil fields. This approach uses two
spreadsheet simulation-based tools that facilitate populating the model with
many horizontal wells, followed by performance forecasting for a given
scenario. This rapid screening methodology was developed for a depletion-drive
production mechanism in heavy-oil fields, but it has not been tested for other
reservoirs or production mechanisms.
The fifth paper of this issue is
authored by Spivey, Valko, and McCain; it presents a correlation for accurate
estimation of the isothermal oil-compressibility coefficient for use in
material-balance applications. The authors use more than 3,500 lines of data
from 369 laboratory studies to develop this correlation equation, which
calculates the average compressibility between the bubblepoint pressure and a
higher pressure of interest.
In the sixth paper, Shaoul, Behr, and
Mtchedlishvili describe the development and capability of a tool to interface a
hydraulic-fracture model and a 3D reservoir simulator. This is an improvement
over past attempts to model post-hydraulic fracture behavior by modifying skin
or productivity index in a simulator.
The seventh paper, by Hiraiwa and
Suzuki, presents a new method to incorporate residual oil saturation to
gasflood into a compositional reservoir-simulation model. This new method
prevents the simulation models from incorrectly predicting
lower-than-prescribed residual oil saturations, a phenomenon caused by
vaporization of oil components allowed by the equation of state.
The subject of the eighth paper, by
Mohannadi, Ozkan, and Kazemi, is a discussion of pressure-transient responses
of horizontal wells in anticlinal structures as well as curved and undulating
wells in slab reservoirs. The authors show that in the absence of a gas cap,
conventional horizontal-well models can be used to approximate the flow
characteristics of the systems in which the well trajectory does not conform to
the curvature of the structure.
The subject of the ninth paper, by
Yamada and Okano, evolves around the modeling and history matching of a complex
pressure system usually occurring in stacked rhyolite lava domes erupted in a
submarine environment. An approach using a combination of multipoint
geostatistics and probability perturbation is shown to successfully capture the
curved facies boundaries within stacked lava domes while accounting for
pressure information by means of history matching.
The tenth and final paper of this issue,
by Egermann, Laroche, Manceau, Delamaide, and Bourbiaux, describes the details
of an experimental and numerical study of water/gas imbibition in vuggy
carbonates. This is important to tight gas carbonate reservoirs that face early
water breakthrough because of the presence of fractures and an active aquifer.
This study provides a representative experimental data set and an enhanced
understanding of the physical processes governing such imbibitions.