The SPE technical journals, including SPEPO, are “peer-reviewed”
technical publications. The publication of a paper in this journal indicates
that the author’s peers believe that the paper represents a significant
technical contribution and is founded on sound science and technology. As
such, the publication of a peer-approved paper conveys a higher standard than
a paper that is published in a trade journal and merely edited for grammar and
legibility of figures. More important, the process of peer review helps assure
the reader that the science is reliable and can be used to further the
The distinction between a conference presentation and journal paper is also
noteworthy. Some papers make interesting conference presentation but may not
be suitable for further publication in a journal. For example, papers that
just inform the industry of a new product and keep the technical details
confidential are poor candidates for journal publication. Likewise, papers
discussing the success of a company-specific tool or its successful field
application also may fall into this category. Similarly, papers discussing
unfinished and inconclusive work cannot be considered for publication.
It is not my intent to discourage anyone from submitting paper for peer
review; however, knowing the minimum requirements for peer review may save
time both for the authors and for the SPEPO technical editors.
Leading off this expanded issue of peer-reviewed papers is a scale-management
paper. Coreflood Studies Examine New Technologies That Minimize
Intervention Throughout Well Life Cycle discusses the technical problems
associated with treating subsea wells and examines new technologies for
scale-inhibitor squeeze treatment for both low water-cut and high water-cut
subsea wells throughout their life cycle.
Oil and/or gas production can be increased in waterflooded reservoirs by
stopping further water injection and depressurizing the reservoir to release
solution gas. The paper Impact on Scale Management of the Engineered
Depressurization of Waterflooded Reservoirs: Risk Assessment Principles and
Case Study discusses the assessment and prediction of scale-related
formation-damage problems that are likely to occur during the depressurization
of a case-study waterflooded reservoir by use of reservoir-simulation tools.
The next paper, Measurement and Prediction of Salt Solubility in the
Presence of Hydrate Organic Inhibitors, presents a novel numerical
approach capable of predicting salt formation in the brine solution with or
without hydrate organic inhibitors.
The BP-operated Miller field has the harshest oilfield-scaling regime in the
North Sea. On average, three to four squeeze treatments per week are performed
across the online wells. As such, the Miller field offers a unique opportunity
to evaluate new technologies and engineering solutions in an attempt to
increase the wells’ overall efficiency. Deep Downhole Chemical
Injection on BP-Operated Miller: Experience and Learning details the
design criteria of the deep downhole chemical injection (DDHCI) completion, as
well as the philosophy of installing such a device. It also provides details
on the management strategy of using DDHCI in a proactive manner to maximize
the time between squeeze treatments.
The next paper, Acid-Sensitive Aluminosilicates: Dissolution Kinetics and
Fluid Selection for Matrix-Stimulation Treatments, presents a combination
of laboratory testing (i.e., dissolution kinetics) and geochemical simulations
that can be used to elucidate the underlying reaction mechanisms for analcime,
chlorite, and illite in hydrochloric acid, and mixtures of hydrochloric and
hydrofluoric acids, and to determine their impact on reservoir treatments.
Guidelines for the design of matrix-stimulation treatments for acid-sensitive
formations are also presented.
Considerations of Damaged Zone in a Tight Gas Reservoir Model With a
Hydraulically Fractured Well discusses a method to integrate the
hydraulically fractured well and the fracture environment (damaged through the
leakoff of the fracturing fluid) into a reservoir-simulation model. This
approach is illustrated through the analysis of a cleanup process in a damaged
fractured well within a Rotliegende tight gas formation in north Germany.
Commonly used proppants include various sands, resin-coated sands,
intermediate-strength ceramics, and sintered bauxite—each employed for their
ability to effectively withstand the respective reservoir closure-stress
environment. As the relative strength of various materials increases, so do
their respective particle densities. Unfortunately, increasing the particle
density leads to difficulty in placing particles evenly throughout the created
fracture geometry. Intuitively, a lesser-density proppant with sufficient
strength would be easier to transport and would provide increased fracture
width and, hence, enhanced fracture conductivity. High Strength,
Ultralightweight Proppant Lends New Dimensions to Hydraulic Fracturing
Applications presents data illustrating the performance of a new
ultralightweight proppant over a broad range of conditions and a discussion of
relative performance in field applications.
Optimizing Fracture Stimulation Using Treatment-Well Tiltmeters and
Integrated Fracture Modeling presents the results of the multiwell pilot
project that was conducted in the Copper Ridge field in Wyoming to assess
future development potential. Fracture-mapping results from several wells were
integrated to build a calibrated fracture model that was successfully applied
in the field.
Development and First Field Application of a Gel/Cement Water Shutoff System
presents laboratory data showing superior shutoff behavior at high bottomhole
temperatures and high differential pressures of a fluid system comprising
cement mixed with gel. In a test well, this fluid system has proved to be very
cost effective for solving water-production problems in oil wells.
Certain water-soluble gels and water-soluble polymers can reduce permeability
to water much more than permeability to oil. Because of operational or
economic constraints, the gel treatments that are intended to plug the water
zones are often placed without zonal isolation. Consequently, the injected
gels penetrate both oil and water zones. It has been observed in the field
that oil zones often exhibit a significant “cleanup time” after placement of
gel treatments. Cleanup of Oil Zones After a Gel Treatment presents a
simple mobility-ratio model that can be used to predict cleanup times for both
fractured and unfractured wells after a gel treatment.
The formation of a stable and nonerodible mudcake during the course of
drilling is very important to eliminate mud-induced formation damage. A
Novel Laboratory Method for Assessing the Erosional Characteristics of Mudcakes
presents a simple, field-applicable method for predicting the erosional
potential of cakes formed by muds of different chemical composition. The
prediction of erosional behavior is essential in screening and selecting
appropriate mud additives for producing good-quality mudcakes on the borehole
The next paper, Stabilization of Gas-Distribution Instability in
Single-Point Dual Gas Lift Wells, presents a simple nonlinear model that
captures the essential dynamics of gas-distribution instability despite the
complex nature of two-phase flow.
Permanent downhole-pressure gauges are installed to monitor the well and
reservoir conditions in real time. The downhole-pressure data have been used
to detect changes in reservoir properties; monitor skin, permeability, and
pressure drawdown over time; evaluate the performance of well completion,
stimulation, or workover; and identify reservoir connectivity. Production
and Injection Profiling Through Permanent-Downhole-Pressure-Gauge Recording
During a Coiled-Tubing-Conveyed Workover Operation presents a unique
application of downhole-pressure gauges for production or injection profiling.
Flow Profiling by Distributed Temperature Sensor (DTS) System―Expectation
and Reality presents a thermal model for single-phase and multiphase fluid
flow along a vertical, deviated, or horizontal well. The model can be applied
both for temperature prediction and for flow profiling by use of a measured
Stress distribution in a reservoir directly affects the integrity or failure
of reservoir rocks. Rock failure can be engineered to improve well injectivity
or productivity. The paper An Analytical Model of Temperature and Stress
Fields During Cold-Water Injection Into an Oil Reservoir presents a
transient analytical model that can be used to study the temperature and
stress distribution induced by a nonisothermal fluid injection (i.e.,
Optimization of Commingled Production Using Infinitely Variable Inflow
Control Valves presents a sequential linear programming that can be used
to periodically optimize inflow control valve settings during commingled
production, primarily to maximize the oil-production rate against water- and
With the advent of horizontal drilling technology, flow in long perforated
pipes has become an important issue in the petroleum industry. The paper
Flow in Perforated Pipes: A Comparison of Models and Experiments presents
a model of pressure losses in perforated pipes that includes the influence of
inflow through the pipe walls. The model compares favorably with past and
recent experimental studies.
Major oil companies often require their employees and contractors to use a job
safety analysis (JSA) process. A recent survey of Gulf of Mexico offshore
drilling rigs and production platforms revealed that current JSAs tend to be
viewed as tedious formalities and that crews comply with them only because of
requirements. A New, Improved JSA Process Gets Enthusiastic Approval From
Field Personnel introduces a new style of JSA that provides significant
time savings and is considerably more effective in reducing the likelihood of
accidents; it provides a powerful tool for on-site management. The new JSA has
received enthusiastic approval from field personnel.
With emerging demands and new market opportunities expected, the ways of
transporting natural gas from offshore fields and overseas sources have
generated renewed interest. Compressed Natural Gas (CNG): An Alternative to
Liquid Natural Gas (LNG) presents a detailed comparative analysis based on
the techniques and costs for the LNG and CNG.
In closing, this issue of the journal contains 19 technical articles covering
a range of interest related to production and operations. I hope that between
them, they contain something that is of interest and value to every reader of
As ever, if you have any comments—positive or negative—about the content of
this issue, I encourage you to send them to me at email@example.com.