bluuebunny/crossref_metadata_2025_split huggingface dataset:
Impact of Gluten-free Camp on Quality of Life of Children and Adolescents with Celiac Disease
Authors: Bongiovanni Tasce R. Simon , Clark Ann L. , Garnett Elizabeth A. , Wojcicki Janet M. , Heyman Melvin B. 
Published: February 2010

OBJECTIVE:
A gluten-free camp allows children with celiac disease (CD) to enjoy a camp experience without concern and preoccupation with foods they eat or the stigma of their underlying disease. The objective of this study was to evaluate the impact of gluten-free camp on quality-of-life indicators for children and adolescents with CD.

METHODS:
Children aged 7 to 17 years with CD were administered a 14-question survey at the beginning and the end of a 7-day gluten-free camp. Surveys used a Likert scale to examine general well-being, emotional outlook, and self-perception for the week before each survey. Differences between the time points were compared. Data were analyzed by paired t test.

RESULTS:
Of the 104 campers who attended camp, 77 (21 male) completed the survey at both time points. Most (70%) had been on a gluten-free diet (GFD) for &lt;4 years. All seemed to benefit from camp, no longer feeling different from other kids or feeling frustrated with a restricted diet. A more beneficial impact was found for campers who were on a GFD for &lt;4 years. Overall, campers reported an improvement in 11 of 14 questions, statistically significant (P &lt; .05) for 8 of those 11 questions. Improvement was observed in each of the 3 categories of questions: well-being, self-perception, and emotional outlook.

CONCLUSIONS:
Children who had CD and attended a week-long gluten-free camp demonstrated improvement in well-being, self-perception, and emotional outlook. The positive effects of camp were more apparent among campers who had been on a GFD for &lt;4 years compared with those who had been on a GFD for ≥4 years, suggesting an adaptation to CD with time. A gluten-free camp that provides an environment of unrestricted foods can at least temporarily alleviate stress and anxiety around food and social interactions. Durability of these observations on return to daily life requires additional study.
Association BetweenHelicobacter pyloriand Gastrointestinal Symptoms in Children
Authors: Spee Leo A. A. , Madderom Marieke B. , Pijpers Maaike , van Leeuwen Yvonne , Berger Marjolein Y. 
Published: February 2010

OBJECTIVE:Recurrent abdominal pain (RAP) and other gastrointestinal (GI) symptoms are common complaints among children. The role of Helicobacter pylori in the cause of these complaints remains controversial. Nevertheless, there is an increasing pressure on primary care clinicians to screen for H pylori infection in symptomatic children. We systematically reviewed the published evidence for an association between H pylori infection and GI symptoms in children.METHODS:Medline and Embase databases up to July 2009 were searched to identify studies that evaluated the association between H pylori and GI symptoms in children aged up to 18 years. When studies reported on abdominal pain without additional definition, thus not fulfilling Apley's criteria, we grouped these outcomes as unspecified abdominal pain (UAP). Methodologic quality was scored by using a standardized list of criteria, and crude odds ratios (ORs) with 95% confidence intervals (CIs) were calculated and pooled.RESULTS:Thirty-eight studies met our inclusion criteria: 23 case-control studies, 14 cross-sectional studies, and 1 prospective cohort study. The overall methodologic quality was low. Pooled ORs for the association between RAP and H pylori infection in children were 1.21 (95% CI: 0.82–1.78) in 12 case-control studies and 1.00 (95% CI: 0.76–1.31) in 7 cross-sectional studies. Meta-analysis of the association between UAP and H pylori infection in 6 hospital-based studies resulted in a pooled OR of 2.87 (95% CI: 1.62–5.09) compared with 0.99 (95% CI: 0.46–2.11) in 5 population-based studies. Two of 3 studies concerning epigastric pain reported a statistically significant positive association with H pylori infection.CONCLUSIONS:We found no association between RAP and H pylori infection in children and conflicting evidence for an association between epigastric pain and H pylori infection. We found evidence for an association between UAP but could not confirm this finding in children seen in primary care.
How Significant Is the Formation Damage in Multi-fractured Horizontal Wells?
Authors: Yu Xiance , Guo Boyun 
Published: February 2010

Abstract
Large scale and expensive hydraulic fracturing operations are common for enhancing well productivity in low-permeability reservoirs. Part of the expenses of these operations incur owing to using low-damaging fracturing fluids, while the true significance of the formation damage in fractured wells is still not clear. This paper evaluates the significance of fracture face matrix damage in multi-fractured horizontal wells.
We analyzed the effect of facture face skin on productivity of multi-fractured horizontal wells using a recently developed mathematical model. This model was derived on the basis of a rigorous coupling of reservoir pseudo-radial flow, reservoir linear-flow, fracture linear-flow, and fracture radial-flow near the wellbore. Results were sensitized to reservoir properties and facture face matrix skin properties determined by fracturing fluid properties and treatment conditions. Large ranges of possible leak-off coefficient and spurt-loss coefficient were investigated. Both oil and gas reservoirs were considered. We concluded that fracture face skin has a little influence on productivity of multi-fractured horizontal wells. Even in the worst situations, the reduction in well productivity due to fracture face matrix damage is less than 5%. Therefore, it is not necessary to use expensive low-damaging fracturing fluids in most hydraulic fracturing operations.
Oilfield Scale-Induced Permeability Damage Management During Waterflooding
Authors: Adesina F. A. , Olugbenga F. , Samuel A. 
Published: February 2010

Abstract
The precipitation, accumulation and disposition process of oilfield sulphate scales is a major ongoing flow assurance problem in hydrocarbon production. This pose serious injectivity and productivity problems in a water flooded reservoirs. Several works and software packages such as multi-scale 6.0 and scalechem have been developed for predicting scaling tendency and average scales precipitation inside the reservoir but neglecting the fact that not all the occurring scale precipitation would cause formation damage near the well bore region. Some of the precipitated scales escape through the pore spaces to render havoc to flow in the production string since it is not all the scale precipitation inside the reservoir would plug the formation.
For an adequate planning and monitoring of water injection, scale treatment schedule and disposition programme, there is the need to estimate the fraction of sulphate scales precipitation that occupies pore spaces and the corresponding degree of permeability damage at well bore vicinity. It is also imperative to evaluate the effects of oilfield scale induced permeability damage on the success of water flooding project.
In this paper, an interactive software package has been developed for predicting the fraction of oilfield scales that occupies pore space and the corresponding permeability damage at different location away from the well bore. The software complement the existing oilfield scaling prediction software such as multi-scale 6.0, scalechem and scalbute recently reported by Fadairo et al. This is useful for adequate planning and controlling of water injection project, oilfield scale treatment schedule and disposition programme.
Correlating Flowing Time and Condition for Plugging of Rectangular Openings, Natural Fractures, and Slotted Liners by Suspended Particles
Authors: Tran T. V. , Civan F. , Robb I. 
Published: February 2010

Abstract
Conditions leading to plugging of fractures and slots by particles of different size, shape, composition and concentration are investigated experimentally. Empirical correlations are developed on the basis of relevant dimensionless numbers which determine the effect of aspect ratio (length-to-width ratio) of fracture opening and particle size distribution on plugging conditions. Plugging capabilities and fluid loss through fractures and slots are found to depend on the particle shape, size, composition, particle concentration, flow conditions, and fluid properties. It is determined that plugging occurs when the ratio of the fracture width to average particle diameter versus Particle-Volume-Fraction Reynolds number falls into the region below the curve described by a dimensionless empirical exponential correlation. Expressed in dimensionless numbers, such a relationship is directly applicable for estimation of whether plugging will occur and the time required for plugging under prescribed field conditions. The dimensionless correlations developed in this paper can also be used as a screening tool for best lost circulation material (LCM) candidates.
A New Acid Treatment Procedure to Improve Injectivity in Brazil Offshore Horizontal Wells
Authors: Farias R. L. , Prata F. G. , Souza L. A. , Jardim A. T. , Araújo C. , Pereira A. Z. , Neumann L. F. 
Published: February 2010

AbstractGenerally, offshore horizontal producer wells in Brazil do not require acid treatments after a gravel pack. The drill-in fluids’ filter cakes have low lift-off pressures and are readily produced through the gravel and the screens. Injection wells, however, require acid treatments to break down the filter cake and establish low skin factors and favorable injection profiles.Improved HF Acid System has been used successfully after gravel packs or in other wells to remove drill-in fluid damage and improve injectivity in the formation. Good acid designs were achieved through knowledge and lab tests. Due to the difficulties of obtaining core plugs for lab testing, specialist simulation software has been used to determine the best acid composition.Operationally, the great challenge is reducing rig time for acid jobs without affecting treatment quality. Pumping acid through a longer screen interval using a Horizontal Single Trip (HST) system significantly reduces the treatment time.This paper describes a new procedure to design and pump acid jobs in Campos and Espirito Santo Basins, based on: application of specialist simulation software to design the acid system; inclusion of 15% HCl:corrosion Inhibitor blend ("Mud Cake Remover") before the classical acid treatment; and pumping the treatment through five screens joints using the HST system.
A New Mathematical Model for Estimating Perforation Penetration Length
Authors: Boukadi F. H. , Seibi A. , Ghalambor A. , Iluore F. O. 
Published: February 2010

Abstract
Penetration depth has been studied by a number of scholars both in ballistic science and also in the oilfield. A number of models have been developed for estimating oil well perforation depths and also assessing perforation gun performance under sub-surface conditions. Earlier derived models have been found to be narrow in scope and did not accommodate a wide range of factors that affect perforation gun performance. The intent of this study is to develop a new mathematical model that can extend the scope of previous models and provide room for factors like target strength, explosive load, gun-to-casing clearance, effective impact area of jet/bullet, and velocity of perforator already known to affect perforation gun performance. The approach to the development of the new model was based on the energy conservation theorem. The translational kinetic energy of the jet/bullet was equated to the summation of the gun penetrative work and accompanying heat energy loss. The kinetic energy was represented by a simple relation of half the product of mass and square of velocity of the jet/bullet. The expression for the penetrative work done was based on the one-dimensional Bernoulli's hydrodynamic theorem, while the heat loss was derived using Fourier's law of heat conduction across a cylindrical composite media at steady state. Heat convention through completion fluid was assumed negligible. The new model finds its applications in perforation operation design as well as in appropriate gun selection.
A Smart Approach in Acid Stimulation Resulted in Successful Reviving of Horizontal Producers Equipped With ICD Completions: Saudi Arabia Case History
Authors: Al-Mulhem N. I. , Sharma H. K. , Al-Zain A. K. , Al-Suwailem S. S. , Al-Driweesh S. M. 
Published: February 2010

Abstract
Passive completions, comprised of inflow control devices and external packers, are usually considered in horizontal wells, located in risky or mature areas. These completions are proven techniques for reservoir conformance to mitigate water or gas-coning problems and ensure uniform production contributions along the horizontal section. After well completion or shortly after initial production, these wells may fail to sustain production, largely due to formation damage or plugging in the inflow control devices. The conventional acid program, applied on wells with non-passive completions, is not suitable on these wells, due to the risk of impacting the completion integrity to the extent that it will violate the installation purposes. The requirements of acid treating wells with the same completions become inevitable due to the increasing number of wells equipped with these completions in a major carbonate reservoir in Saudi Arabia. A smart approach has been developed through innovative thinking to stimulate wells equipped with passive completions. The new approach has successfully stimulated four wells and resulted in restoring well productivity. This smart stimulation approach demonstrates a competent method to clean out the ICD completion along the horizontal section and to remove formation damage.
This paper presents in depth discussion of rigless acid stimulation operations on oil producers to remove formation damage and improve well productivity, at a reduced cost. This paper also outlines the successful application of the smart approach in acid stimulation of horizontal wells — equipped with passive completion — and discussed the post-treatment results.

Background
Water injection was started to boost up and maintain the reservoir pressure. All producers were initially drilled as vertical producers and with the advancement of the water front, a great deal of the vertical producers were converted to short radius horizontals (SRH) that targeted the thin oil column behind the flood front.
The oil was sourced from Jurassic organic-rich lime mudstones, which were laid down in intershelf basins. The integrity of the thick anhydrite top seal is enhanced by the general absence of faults in the Jurassic section. The main oil reservoir is the Upper Jurassic Arab-D limestone, which improves upward from mudstone to skeletal-oolitic grainstone, reflecting successive upward-shoaling cycles. The excellent reservoir quality is due to the preservation of the primary porosity, the enhancement of permeability, and the presence of fractures in the deeper and tighter parts. The oil was sourced exclusively from Jurassic organic-rich mudstones and is effectively sealed beneath massive anhydrite. The general absence of faults at the Arab-D level maintained seal integrity.
A Novel Approach for the Controlling of Whole Mud Losses while Encountering Productive Formations
Authors: Fuller George A. , Serio Michael , Trahan Jared , Langlinais Joey 
Published: February 2010

Abstract
The drilling industry routinely encounters formations with pore pressures that are lower than anticipated. In some cases, these pore pressures require specialized treatments to control the loss of whole drilling fluid. A massive loss of whole drilling fluids, whether water-based or oil-based, can be costly, result in nonproductive time (NPT), and if encountered near potential productive zones, also result in damage to the producing capability once completion has been performed. Key wellbore data, such as actual hole size versus drilled hole size, accurate bottomhole circulating temperature (BHCT), and placement technique with optimum bottomhole assembly (BHA) for accurate placement of treatment design is critical for job success.
Placing a successful treatment for the control of whole mud losses and to minimize possible formation damage can be a complex and often expensive undertaking. Numerous solutions have been identified in the industry ranging from effective bridging or lost circulation material (LCM) incorporated in the mud to complete process solutions such as crosslinked fluid structures to ultimate cement slurries. The damage that is left as a result of the fluids pumped is a major disadvantage of most systems.
This paper presents a novel approach using a rigid setting fluid (RSF) that can be engineered to maintain a low viscosity during placement and activate by temperature to transition from a fluid to a set state almost immediately to effectively control further losses to the formation. In addition, using the right angle set (RAS) created by the exothermic reaction, the system can tolerate contamination of extraneous fluids up to 50% and still provide adequate compressive strength. Lastly, the material is soluble in acid with a predicted 99% regained permeability. A case history will be presented where the RSF treatment was used and effectively controlled, eliminating further whole mud losses to the weak formation.
Single-Stage Chemical Treatment for Oil-Based Mudcake Cleanup: Field Case and Laboratory Studies
Authors: Al-Otaibi M. A. , BinMoqbil K. H. , Al-Rabba A. S. , Abitrabi A. N. 
Published: February 2010

Abstract
Formation damage minimization and removal are important factors in enhancing field productivity and achieving targeted production rate. While formation damage is anticipated during drilling, an effective wellbore cleanup fluid becomes essential to remove mud damage and enhance well productivity. Filter cake layer created by drilling fluid can impair production considerably and should be removed prior to production using an effective treatment. Filter cake can be removed using a chemically designed filter cake removal treatment. The design of the treatment requires considerations of mud type and reservoir conditions. Also, it is important to consider the compatibility aspect of the treatment fluid with formation fluids and drill-in fluid base oil. Incompatible fluids result in precipitation which leads to further formation damage.
In Saudi Arabia, many sandstone reservoirs are drilled with invert emulsion drill-in fluid to avoid the risk of clays swelling, which can lead to hole sloughing and formation damage. However, production impairment due to mud damage effect was observed in some horizontal wells drilled with invert emulsion drill-in fluid and completed with stand-alone screens as a result of improper mud managemet. After being put on production, their production rates have been reduced significantly with time. The decrease in production was related to screen blockage and mud cake impairment. A newly developed single-stage treatment was spotted and soaked to remove oil based mud cake and screen blockage. A significant sustained improvement in production was noticed and flowback solids indicated removal of screen blockage and mud cake.
Lab studies were conducted at reservoir simulated conditions to evaluate the effectiveness of the treatment. The study covered testing the treatment filter cake removal efficiency, return permeability tests with reservoir core samples, and compatibility tests with formation fluids and drill-in fluid base oil. This paper will discuss in detail the laboratory work conducted and the successful field treatment performed.
Water-Control Management Technologies: A Review of Successful Chemical Technologies in the Last Two Decades
Authors: Jaripatke O. , Dalrymple D. 
Published: February 2010

Abstract
Completion technologies and programs have had significant improvements throughout the last two decades. But water-production problems associated with channeling, cross flow, and coning still prevail in many areas. In addition to undesirable effects of the water on the surface and subsurface equipment, the cost of handling the water in producing wells can seriously reduce the profitability of the well. Diagnosing the causes of water-control problems has long been a major hurdle to operational economics.
In the past two decades, water-control technologies have also evolved and developed significantly. This paper is a review of those technologies. It covers the gamut of water-control-related problems that can arise during the life of a well. A decision-matrix chart depicting types of water-control problems with the appropriate water-control technology is given. Case-history references for each solution category are also presented. The paper classifies different types of water-production problems keyed by their onset mechanisms. It also presents a review of the methods and limitations of the current water-control processes. A special emphasis is placed on the description of solutions to the water-control problems that are linked to hydraulic-fracture stimulation of reservoirs. The paper discusses the water-control management issues in the following categories: (1) prediagnostic evaluation, (2) problem identification, (3) diagnostic evaluation, (4) treatment-design considerations, (5) chemical water-control technologies, and (6) case-history references for each problem-solution category.
Information presented in this paper will provide a completion engineer a good understanding of the range of water-control issues and give a methodical approach to selecting appropriate and optimum solutions that have evolved in the last two decades.