bluuebunny/crossref_metadata_2025_split huggingface dataset:
Integrated History Matching Simulation Study of the First Miscible CO2-EOR Pilot in Abu Dhabi Heterogeneous Carbonate Oil Reservoir
Authors: Al Hajeri Salma , Ghedan Shawket , Al Basry Ali , Negahban Shahin 
Published: September 2011

Abstract
Carbon Dioxide (CO2) Enhanced Oil Recovery (EOR) process is most likely to be the future hydrocarbon recovery process in Abu Dhabi[1]. In November 2009, Abu Dhabi Company for Onshore Oil Operations (ADCO) has commissioned the first CO2-EOR pilot in the Middle East. The pilot project was implemented successfully on a fast track basis with a broad objective to test the concept of CO2 flooding in Abu Dhabi complex carbonate oil reservoirs.
The project comprises three wells, a single CO2 injection well, an observation well and a single oil producing well An intensive reservoir monitoring plan was implemented pre-and post- CO2 injection to evaluate the uncertainties related to the reservoir fluid and rock properties, CO2 injectivity, miscibility, and sweep efficiency.
Available reservoir static and dynamic data was employed to construct a fully compositional simulation model to history match the pilot performance based on remarkable field observations. Effort was made to ensure that all reservoir data were quality checked, re-interpreted and validated before being utilized in the simulation model.
Conventional history matching was conducted to match the model response to the pilot performance. This is complemented with Software Assisted History Matching to further quantify and assess the range of uncertainties for different reservoir parameters that would impact the quality of the history match. Sensitivity analysis was carried out to identify those parameters that have the most effect on the pilot performance.
This paper outlines the main findings for the first miscible CO2-EOR pilot in Abu Dhabi based on well calibrated compositional model considering the most critical reservoir uncertainties affecting the process.
Zeta Potential Investigation and Mathematical Modeling of Nanoparticles Deposited on the Rock Surface to Reduce Fine Migration
Authors: Ahmadi M. , Habibi A. , Pourafshry P. , Ayatollahi Sh. 
Published: September 2011

Abstract
Fine migration is a noticeable problem in petroleum production engineering. Plugging of throats in porous media occurs due to detachment of fine particles from sand surfaces. Hence the study of interactions between fines and pore surfaces and investigating the governing forces are important issues to describe the mechanism of fines release process. The main types of these forces are electric double layer repulsion and London-van der Waals attraction. It is possible to change these forces by the use of nanoparticles as surface coatings. Nanoparticles increase the effect of attraction forces in comparison with repulsion forces.
In this paper, we present new experiments and modeling to observe these properties of nanoparticles. For this purpose, the surface of pores was coated with different types of nanoparticles (MgO, Sio2, and Al2O3). Zeta potential test was used to examine changes in potential of the pore surfaces. Total interaction energy is then mathematically calculated to compare different states. Total interaction energy is a felicitous criterion which gives proper information about the effect of different nanoparticles on surface properties. Accordingly, the total interaction plots are found to be the suitable tool to select the best coating material.
10-μm-diameter silica spheres and glass beads packed cwere utilized as fines and porous medium, respectively. Measurements were performed in 1:1 electrolyte aqueous solution of 10−3 mM, and probe-plate separation distances varied from less than 1 nm to 50 nm. Magnitude of change in zeta potential for MgO nanoparticle is 45 mV. Our model demonstrated that the magnitude of the electric double layer repulsion in comparison with the London-van der Waals attraction between probe and plate surface was considerably diminished when MgO nanoparticle was used to coat the surface of plate which is in complete agreement with our experimental observation.
While Drilling Mobility and Distributed Temperature Profiles Applied to Matrix Stimulation of a Giant Carbonate Oil Field: A Case Study
Authors: Dhufairi M. A. , Orban N. , Ahmed D. , Ebrahim A. , Kalinin D. , Baez F. 
Published: September 2011

Abstract
This case study focuses on a Middle East giant carbonate oil field drilled with horizontal producers and water injection wells. In this particular field, formation pressure while drilling measurements are primarily used to characterize the mobility of the formation fluid, to ensure injectors are optimally placed in good injectivity intervals and producers in high productive zones. Acid stimulation is required to mitigate drilling induced reservoir damage. Owing to the length of the open hole sections and the high heterogeneity of the formation mobility, effective placement of acid is very challenging. Viscoelastic diverting acid is commonly used to assure good zonal coverage across each stimulation stage, but the length of the extended reach wells requires optimum diverter placement for cost effectiveness.
An innovative methodology using distributed temperature surveys (DTS) with fiber optic enabled coiled tubing was introduced to compare pre-treatment injectivity with the mobility profile acquired while drilling before formation damage has occurred. The predicted injectivity/productivity profile computed from mobility measurements is used to establish the fluid placement strategy during the pre-job planning stage to decide on the required amount of acid and diverter. During the matrix stimulation operation, the temperature profiles after an injectivity test are compared with the baseline DTS temperature and mobility profile to identify thief zones and intervals with drilling damage. The availability of this information at the well site during the acid treatment allows the selective placement of diverter fluid across the thief zones, verification of the effectiveness of the diversion, its distribution along the wellbore, and accurate spotting of acid across damaged zones.
By implementing this process, under stimulated intervals close to the heel section, which has longer exposure time to the drilling fluids, were identified. The current practice of pumping alternating stages of acid and diverter for certain lengths of wellbore segment has been revised and a new optimized approach was introduced. The new methodology has been applied to several wells and has allowed a better use of available treatment fluids to obtain more even injectivity/productivity profiles and maximize stimulation effectiveness.
Lessons Learned from the First Miscible CO2-EOR Pilot Project in Heterogeneous Carbonate Oil Reservoir in Abu Dhabi, UAE
Authors: Al Basry A. , Al Hajeri S. , Saadawi H. , Al Aryani F. , Obeidi A. , Negahban S. , Al Yafei G. 
Published: September 2011

Abstract
In 2009, ADCO implemented the first ever CO2 EOR pilot in the Middle. The pilot project is part of the Company overall strategy evaluate the feasibility of CO2 injection as an EOR process and in order to address key technical and business uncertainties as well as the risks associated with CO2 injection The pilot project includes three wells, a CO2 injection well, an observation well and an oil producing well. The pilot has been operated for one year now to achieve a set of pre-defined objectives. During this period, a comprehensive data acquisition program was conducted and collected data from wells and reservoir performance was analyzed to address key uncertainties related to miscible CO2-EOR injection process.
Upon the completion of the project objectives in June 2010, a decision was taken to expand the project scope and target with new objectives that will help understanding another challenging anomaly in the oil fields (CO2 performance in the transition zones).
This paper shares the challenges faced, lessons learnt and experience gained during the implementation, operation, and monitoring of the First Miscible CO2-EOR pilot project in a heterogeneous carbonate oil reservoir in Abu Dhabi, UAE.
Automatic Trajectory Control in Extended-Reach Wells
Authors: Cockburn Colin , Matheus Justo , Dang Khoa Le 
Published: September 2011

Abstract
Prior to the advent of rotary steerable technology, directional drillers controlled trajectories using nonintelligent drilling tools such as downhole motors. Drilling a directional wellpath using this technology was relatively inefficient and had adverse effects on wellbore positioning and quality. The introduction of rotary steerable systems (RSS) enabled fast, efficient, and accurate wellbore placement and construction. This step change in steering technology tested the limits of human operators to assimilate the MWD data, compare the actual well trajectory with the planned, and take corrective actions to get back to the desired well plan.
RSS are very sophisticated tools with downhole intelligence. This intelligence provides the framework to implement advanced and automatic downhole trajectory-control algorithms. These have no lag times and can consistently perform accurate, efficient, and reliable corrective actions.
This paper presents the field results of the application of a novel trajectory-control algorithm which regulates inclination and azimuth downhole. The examples illustrate the impact of the technology on extended-reach wells. The paper ends with analyses, lessons learned, and conclusions from the field trial runs.
Development and Testing of a Novel Corrosion Inhibitor Technology for Acid Corrosion
Authors: Seth Kushal , Evans Brian , Hughes Baker , Gabrysch Allen 
Published: September 2011

Abstract
Corrosion of oilfield tubulars during a stimulation treatment is an acute problem as evidenced by weight loss, pitting, and cracking. Stimulation methodologies such as pickling, acid washing, matrix acidizing and acid fracturing can cause severe acidic corrosion mainly due to the low pH nature of the treatment fluid. The most common approach to mitigate corrosion is to add corrosion inhibitors to the stimulation fluids. To enhance the performance of acid corrosion inhibitors certain chemicals called corrosion inhibitor intensifiers are also commonly used. These intensifiers are sometimes partially soluble thus rendering them ineffective. This paper describes the evaluation of a new more soluble corrosion inhibitor intensifier designed to be effective in stronger acids for longer wellbore contact times.
The development and testing of such an inhibitor package is presented with the effects of varying test temperatures, types of stimulation fluids and metallurgies.
The paper presents results of acid corrosion testing performed on five different metallurgies namely 13Cr-S110, 718 Inconel, 13Cr-M110, 13Cr95 and 22Cr at 180°F and 220°F. Additionally the stimulation fluid ranged from 15% HCl, 13.5% HCl +1.5% HF and spent acid. The test period was extended to 24 hrs to test the effectiveness of the new intensifier package. The proper adsorption of corrosion inhibitors and intensifiers on the tubular can be altered by the addition of additives. To replicate an actual stimulation scenario the acid systems were tested with commonly used acid additives.
The results indicate that the inhibitor package was very effective in providing excellent corrosion protection in extreme test conditions. It was also observed that a large corrosion inhibiting effect was obtained with only a small proportion of synergistic intensifier used. The new, more soluble inhibitor intensifier technology fills the need to enhance corrosion protection in stronger acid environments for a wide variety of metallurgies and longer contact times.
Asset Optimization Metrics Card – A Unique Approach to Maximizing Production Efficiency
Authors: Desai Sameer F. , Abdulla Farida , Khatib Awwab , Sinha Satyendra 
Published: September 2011

Abstract
In this era of flourishing E&P activities it is imperative to provide stake holders from operations to management with latest and reliable information quickly. Information integrated from multiple sources, when automated and presented creatively reduces unproductive time for the decision makers for making correct informed decisions. On these lines a unique optimization metrics card has been developed in Kuwait Oil Company for an asset or area which has led to maximizing its production efficiency. Originally created as an excel based metrics report for the Greater Burgan Field, the new asset metrics card is a web based report card applicable for all fields of Kuwait with the ability to divide into increasingly smaller ‘production levels’ or conversely roll up to higher consolidated levels giving both staff and management the quick ability to assess what matters to them.
The asset metrics card consolidates the critical activity and capacity measures required to understand present & future ability to meet production targets. The metrics are a mixture of leading and lagging indicators that are all related to an asset being able to optimize the level of production through a facility by tracking groups of metrics that could be the precursors to future production (leading indicators) and metrics that represent post appraisals of past production activity efforts (lagging indicators).
The overlying purpose of the metrics card is to create awareness and a base for discussion among the field development stakeholders, from the smallest level to the highest on what are the activities that need adjustment to sustain or change progress towards maximizing production. All the metrics are related to or linked to another metric on the card and all metrics lead to the final measure of meeting production targets. These metrics are shared among multiple stakeholders and presents a customer/supplier relationship providing a common venue to discuss the balancing acts needed to meet the shared production targets.
Flow Instabilities in Gas-Lift Wells with Water Coning
Authors: Aguilar M. Lozada , Romero E. Poblano , Sarabia I. Gerrero , Fairuzov Y. V. 
Published: September 2011

Abstract
Linear and nonlinear stability analysis of flow instabilities gas-lift wells with water coning was performed in this paper. A new gas-lift stability criterion, which takes into account water coning, was developed. The criterion was used to analyze flow instability in an offshore gas-lift well. The effect of the water-coning performance on the conditions of the onset of instabilities was investigated. The nonlinear analysis showed that one of the most important instability modes in gas-lift wells is associated with two types of density waves: liquid and water holdup waves. Flow instability in gas-lift wells may result in that the maximum instantaneous liquid flow rate may be several times larger the average liquid flow rate for long periods of time (tens of minutes) in one cycle of oscillation. It was shown that water coning has a strong destabilizing effect on the flow in gas lift wells with a large vertical distance between the injection point and perforations. In some cases heading in such wells cannot be eliminated by increasing the wellhead pressure. One of the most important instability modes in gas-lift wells is associated with two types of density waves: liquid and water holdup waves.
A formal framework for dependability and resilience from a software engineering perspective
Authors: Guelfi Nicolas 
Published: September 2011

Abstract
The goal of this article is to provide a rigorous conceptual framework for defining the concepts of dependability and resilience. Since the seventies, the terms dependability and resilience have been used in nearly all the scientific and technological fields related to Information and Communication systems. The introduction and use of these concepts in all these fields makes it difficult to have a common and precise definition. Having such a definition is nevertheless mandatory for the software and systems engineering research community that create development processes, languages and tools to support the engineering of products that would be required to be dependable or resilient. For this, we introduce an abstract and generic terminology defined mathematically to be used when speaking about dependability and resiliency. We also provide some abstract semantic descriptions to these terminological elements. This formal framework is defined from a software engineering perspective, which means that we define its components such that they are useful for the development or improvement of analysis, architectural design, detailed design, implementation, verification and maintenance phases. To this aim, we provide the necessary elements in accordance with a model driven engineering perspective that enable the definition of a new modelling language for dependable and resilient systems.
Maternally inherited partial monosomy 9p (pter → p24.1) and partial trisomy 20p (pter → p12.1) characterized by microarray comparative genomic hybridization
Authors: Freitas Érika L. , Gribble Susan M. , Simioni Milena , Vieira Társis P. , Silva‐Grecco Roseane L. , Balarin Marly A. S. , Prigmore Elena , Krepischi‐Santos Ana C. , Rosenberg Carla , Szuhai Karoly , van Haeringen Arie , Carter Nigel P. , Gil‐da‐Silva‐Lopes Vera Lúcia 
Published: September 2011

AbstractWe report on a 17‐year‐old patient with midline defects, ocular hypertelorism, neuropsychomotor development delay, neonatal macrosomy, and dental anomalies. DNA copy number investigations using a Whole Genome TilePath array consisting, of 30K BAC/PAC clones showed a 6.36 Mb deletion in the 9p24.1–p24.3 region and a 14.83 Mb duplication in the 20p12.1–p13 region, which derived from a maternal balanced t(9;20)(p24.1;p12.1) as shown by FISH studies. Monosomy 9p is a well‐delineated chromosomal syndrome with characteristic clinical features, while chromosome 20p duplication is a rare genetic condition. Only a handful of cases of monosomy 9/trisomy 20 have been previously described. In this report, we compare the phenotype of our patient with those already reported in the literature, and discuss the role of DMRT, DOCK8, FOXD4, VLDLR, RSPO4, AVP, RASSF2, PROKR2, BMP2, MKKS, and JAG1, all genes mapping to the deleted and duplicated regions. © 2011 Wiley Periodicals, Inc.
Synthesis of fluorescent methoxy poly(ethylene glycol)‐b‐Poly(ethyl cyanoacrylate)–2‐(N‐carbazolyl) ethyl methacrylate copolymer via living oxyanion‐initiated polymerization
Authors: Lin Xiaona , Deng Liandong , Dong Anjie 
Published: September 2011

AbstractThe fluorescent amphiphilic block copolymer methoxy poly(ethylene glycol) (mPEG)‐b‐poly(ethyl cyanoacrylate) (PECA)–2‐(N‐carbazolyl) ethyl methacrylate (CzEMA) was synthesized via living oxyanion‐initiated polymerization. mPEG‐b‐PECA–CzEMA was characterized by gel permeation chromatography, 1H‐NMR, and Fourier transform infrared spectroscopy. The results indicate that the polymerization was well controlled with a narrow molecular weight distribution. The mPEG‐b‐PECA–CzEMA nanoparticles prepared by nanoprecipitation techniques showed a narrow size distribution with an average diameter of less than 100 nm. The mPEG‐b‐PECA–CzEMA exhibited a strong carbazole fluorescence. Furthermore, it was found that the fluorescence intensity of mPEG‐b‐PECA–CzEMA was sensitive to a change in solvent. The results indicate that a subtle change in the state of the polymer micellar association may have altered the state of carbazole groups, which was responsible for the fluorescence emission. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Making the case for the humanities in evaluation training
Authors: Smith Deborah A. 
Published: September 2011

AbstractThe author argues that evaluators who are comfortable with the interpretation of competing values—an ability that can be fostered by exposure to the humanities—might be able to contribute significant advances toward finding a better balance of methodologies in an ever‐more‐ambiguous world. This argument is made by describing a humanities‐informed evaluation graduate course. Black‐and‐white worldviews and one‐size‐fits‐all solutions are hard to reconcile in evaluation environments increasingly characterized by multiculturalism, complexity, and uncertainty. The author reflects on the place of value judgments in the graduate education of future evaluators, not as something to avoid, but as an opportunity to improve needed skills. © Wiley Periodicals, Inc., and the American Evaluation Association
Political psychology in evaluation: A theoretical framework
Authors: Perry S. Marshall 
Published: September 2011

AbstractThe author describes how political psychology, an emerging field that explores the intersection of political science and psychology, can help in conducting evaluations. For example, an evaluator might examine the validity of behavioral assumptions of programs, policies, or organizational mechanisms and people's motivations and subjective experiences within these contexts. An evaluator might also explore the normative orientations of programs and policies, for example, how target goals and implementers are politically framed in a positive or negative light. The author describes a framework for political psychology as applied to evaluation, a brief review of relevant literature and discussion of methodology, and an example of an evaluation informed by political psychology. © Wiley Periodicals, Inc., and the American Evaluation Association
En “gendering” evaluation: Feminist evaluation but “I am NOT a feminist!”
Authors: Bheda Divya 
Published: September 2011

AbstractThe author explores the information gained through interviewing 13 feminist evaluators to explore (a) possible reasons why many evaluators—who draw from feminist principles and research—choose not to identify as “feminist” in their evaluation practice and scholarship and (b) the potential gains and losses to not locating themselves as feminist evaluators. © Wiley Periodicals, Inc., and the American Evaluation Association
New evaluators addressing health disparities through community‐based evaluation
Authors: Schlueter Dara F. 
Published: September 2011

AbstractThe author explores challenges in assessing health issues among ethnic and racially diverse populations, especially those related to a lack of long‐standing relationships with community leaders, knowledge about the community and its needs, and sufficient funding to maintain lasting engagement within the communities of interest. One of the overarching goals of Healthy People 2010, to eliminate health disparities in the United States, has awarded much attention to the correlation between race/ethnicity and persistent and increasing health disparities among U.S. populations. Approaches for implementing and evaluating health interventions designed to address these disparities must be community based in order to identify feasible strategies for improving processes and outcomes among populations of interest. © Wiley Periodicals, Inc., and the American Evaluation Association
Sailing through relationships? On discovering the compass for navigating 21st‐century evaluation in the Pacific
Authors: White Paula , Boulton Amohia 
Published: September 2011

AbstractAotearoa New Zealand is a small bicultural island nation in the Pacific with a multicultural population, a context that poses unique challenges for new evaluators, as it does for our more experienced counterparts. As emerging evaluators, the key challenge we have faced is navigating relationships, at the interface between program funders and culturally diverse communities, with integrity, and to ensure meaningful, credible, and valid evaluation findings. Drawing on their early experiences, the authors discuss their discoveries on sailing through relationships toward evaluation that is “good.” © Wiley Periodicals, Inc., and the American Evaluation Association