bluuebunny/crossref_metadata_2025 huggingface dataset:
Visualization of Heavy Oil Recovery Processes Using Hele-Shaw Cell
Authors: Izuchukwu Ojukwu , Ayodele Taiwo Oluwaseun , Abdullahi Gimba S. , Joshua Dala , Olalekan Olafuyi
Published: October 2018

The linear core flood (physical model) has been used severally in the past to conduct laboratory researches and experiments on Tertiary Oil Recovery. A potential pitfall of the 1D nature of the linear core flood arises during waterflooding; water channels would be blocked due to limited pathways, hence producing the additional oil before chemical consequently breaks through. In real reservoirs, there are more water pathways present; hence the relative impact of these chemical additives on incremental oil recovery is potentially overly emphasized in the laboratory.

This paper presents a study on heavy oil production using chemicals in a locally fabricated 2D Hele-Shaw cell system. The 2D nature of the cell also aids the visualization of non-linear flow pathways. The experiments are run for a constant pore volume (5PV) flooding of Brine, Surfactant slug and Surfactant-Polymer (SP) slug. Recovery and digital images are taken at a minute interval each, thereby making it easier to study growth and distribution of fingers before and after water or chemical breakthrough.

It was observed that after the 5PV of waterflooding, the recovery of oil from the cell reduced gradually till there was no more recovery. The Surfactant slug increased recovery by additional 21%. The more viscous Surfactant-Polymer slug gave an even improved and better recovery. This can be attributed to a clear interaction between the Surfactant and Polymer chemicals in the SP slug. The distribution of fingers between the different phases of flooding were visually observed and compared.
Finite Element Analysis of Induced Stresses on Casings in High Pressure High Temperature HPHT Wells
Authors: Ikponmwosa U. B. , Bello K. O. , Olafuyi A. O. , Dala J.
Published: October 2018

High temperature variation in wells used in thermal oil recovery processes, deep gas wells, offshore wells with significant riser lengths and wells completed in abnormally hot reservoirs cause compaction of formations and this induces local compression and tensile stresses in the various casing strings cemented and landed in the well. Cemented wells are under various stresses and strains in various directions which can result in significant deformations and fracture. Therefore, casing failure or damage is inevitable largely due to thermally generated strains and stresses in the casing and the surrounding formation. This research studied the effect of the non-uniform loading (poroelastic effect) on stresses and failure of casing and cement by developing a Finite Element (FE) method for the analysis of temperature-stress interaction in three dimensions (3-D) for casing, cement and formation with all its complexities using ABAQUS simulation tool.

The tool was used to develop temperature distribution and thermal stresses in the casing and near wellbore formation. This enabled possible casing failure predictions and provided theoretical basis for casing thermal stress failure by coupled temperature field and thermal stress field of casing.
A Realistic Model for Estimating Productivity Index of Vertical Well Using Wellhead Data
Authors: Adesina Fadairo , Temitope Ogunkunle , Gbadegesin Adeyemi , Adebowale Oladepo
Published: October 2018

Productivity index calculation has been an established tool for formulating inflow performance relationship in petroleum production engineering field. The accuracy in its prediction is highly desirable to petroleum industry to predict the well production efficiency and aid in economic analysis of the well. Inability to accurately model and predict flowing bottom-hole pressure in a well may result in erotic value of productivity index of a well.

This paper present an improved model for estimating flowing bottom-hole pressure and analyse its effect on productivity index value of a vertical well without ignoring any pressure resisting terms in the governing thermodynamic equation. Satisfactory pressure differential and productivity index results were obtained at any location in the wellbore, at all time and at both steady and unsteady state period using the newly developed model. Generally the flow phenomenon after shut in requires sufficient time to stabilise or advance to pseudo steady or steady state condition has been demonstrated by this study compared with the existing models that stabilised throughout the flowing period. This study also proves that inaccuracy in the results of existing models were not only caused by the effect of pressure restriction due to friction as opined by Guo et al but may have due to oversight of all pressure restriction term in the fundamental governing equation of flowing fluid in a vertical wellbore.
Brown Field Optimization via Well Head Commingling: A Niger Delta Case Study
Authors: Udobata Uchenna , Mogbolu Emmanuel , Agbor Etta , Epebiyi Taiwo , Onyedikachi Okereke , Cosmas Nwankwo
Published: October 2018

Production system optimization is one of the key ways to derive value from existing assets and ensure optimal field development, by integrating all aspects of the production system from the subsurface to the surface networks. Over the years, various tools have been developed in the industry to aid complete system performance analysis and optimization. In most cases, the scope of optimization is limited to the as built fixed assets which often has limited scope for economic modification in the late life of the asset. Additionally, commingling compatible reservoir fluids using intelligent wells has been identified as a viable means of developing marginal stacked reservoirs, which are otherwise uneconomical if conventional development options are considered. Cosby field which is a prolific field in its late life, had been closed in for over 10 years due to asset integrity and subsequent flowline vandalization. The wells are completed mostly as Two String Dual or Multiple producers to target the stacked reservoirs. Field re-entry campaign provided an opportunity to optimize the approach to field development and bring in the wells which had been closed-in. However, the prevailing completion philosophy required each string to have dedicated flowlines ranging from 3000- 9000 ft. This is to convey the fluids from the well to the flow station; hence each interval had to meet an economic criterion to ensure competitiveness. This paper posits a "beyond blind spot" concept identified for the late life re-entry and optimization of the Cosby field oil wells; by identifying suitable candidates for surface fluid commingling using well and reservoir performance reviews and Integrated production system model as tools. This concept, which aligns with the competitive drive within the E&P industry, delivers a facility cost savings of ca. $2.24 million, and allows an economic potential addition of ca 1.5Mbopd and resource volume of ca. 5.2 MMstb to be safeguarded.
Attic Oil Development in Reservoir with Structural Uncertainty and Complex Gas Cap Movement: A Case Study
Authors: Zubarev Denis , Zeito George , Iranshahr Zhanat
Published: October 2018

The initial development of wedge shaped oil reservoirs that are subject to both aquifer influx and gas cap expansion requires optimal well placement relative to the future movements of gas-oil and water-oil contacts. In offshore developments with limited appraisal wells and no field specific analog data, the initial gas cap size and future aquifer performance are often uncertain. The necessity to de-risk the development often results in untapped oil remaining in up-dip or down-dip locations, depending on the balance between the two drive mechanisms. With sound reservoir management the unproduced volumes can be minimized, but in many cases the oil volume remaining after abandonment is sufficient to justify the additional capital cost to recover it. Accurate estimation of remaining in-place and recoverable volumes are critical for small operators, especially in current oil price environment.

This paper presents a case study for attic oil development in Nigeria with a well sidetrack for a reservoir with significant structural uncertainty and complex gas cap movement. An approach combining history matching of numeric simulation models and simple analytic solutions to address the uncertainty in remaining recoverable volumes and optimal well placement is discussed in detail. Results are compared to the performance of the actual well that was drilled.
Feasibility Study and Selection Process for ICD Applications in an Offshore Niger Delta Field
Authors: Zubarev Denis , Nnebocha Ezinne , Vasper Adam
Published: October 2018

Horizontal wells increase the reservoir-wellbore contact area, allowing the wells to produce at higher flow rates with smaller drawdowns which is especially important in oil reservoirs with a large gas cap or aquifer. Long wellbore lengths can lead to production challenges such as water or gas coning and cusping, an unwanted fluid breakthrough from high-permeability zones, and uneven inflow along the wellbore and nonuniform reservoir sweep.

Inflow control devices (ICDs), based on well-established technology, have been used in hundreds of wells worldwide. Different ICD types and design methods are available and can be applied to mitigate some of the production challenges. The ICDs are installed as an integral part of the sand screens in the well completion hardware. They can be passive, where the ICD size and configuration does not change after it is run in the hole, or autonomous, where the ICD adapts to changes in downhole fluid-flow properties. However, the decision regarding the use of ICDs as well as the design criteria and selection has to be made prior to the well completion operation.

This paper presents a feasibility study on an ICD application in an offshore Nigeria delta oil field with multiple hydrocarbon-bearing reservoirs. Most of the development wells in the field have horizontal openhole 1,000 to 3,000 ft drain sections completed with standalone screens. Strong aquifer and reservoir heterogeneity create production challenges associated with early water breakthrough and suboptimal reservoir sweep. This paper presents a detailed approach to ICD design, sensitivity analysis, and completion optimization, which is based on the coupling of a 3D reservoir model, segmented wellbore model, and ICD models. The proposed ICD completion design is evaluated and sensitized to subsurface reservoir uncertainties using volumetrics. The final decision process is presented to guide the selection and feasibility of an ICD application for two reservoirs.
4D Seismic Monitoring of Injector Performance and Reservoir Dynamics in a Heterogenous Reservoir
Authors: Agunwoke Godwin Oguguah , Obe Ebenezer , Tuitjer Eric , Ekeng Oyie , Okoro Innocent
Published: October 2018

Monitoring fluid movement in a heterogeneous water-flooded reservoir is key to optimizing water injection, detecting early water breakthrough, and locating bypassed oil. While well- and production-based reservoir monitoring techniques are commonly applied, they lack the inter-well spatial resolution required for an accurate assessment of the current water movement. As a key tool in spatial reservoir surveillance, 4D seismic surveys were acquired over a water-flooded field located offshore of the Niger Delta. The aim was to map fluid-flow paths and barriers, manage injection for breakthrough optimization, and optimize well placement. The application of 4D seismic techniques has tremendous potential to provide inter-well information on fluid dynamism over time, provided there is a clear link between the seismic observables and reservoir variables such as fluid, pressure, or temperature. Using physical properties of the rocks and fluids from input wells, a 2D seismic model was used to predict the amplitude response to changes in saturation. This involves estimation of the amplitude difference expected from incremental water saturation between pre-1987 and post-1996 wells. The study establishes a correlation between saturation and the two previously-acquired seismic (baseline and monitor) surveys, which were acquired over a nine-year interval. We interpreted the injected water flow path, the potential locations of bypassed oil, and compartmentalization. This was achieved by integrating the well production information, predicted seismic amplitudes at the wells, and the seismic attribute maps. The resulting analysis provided new insights into unexpected production behavior, such as the premature watering-out of updip wells relative to offset wells, and the anomalous pressure support across fault compartments. In accordance with the well performance, it was observed that the injected water follows preferential and heterogeneous flow directions, indicating a strong stratigraphic fluid-flow overprint on the reservoir not previously discernible from well data alone. Subsequently, early results from infill drilling and injection management show better well performance leading to improved oil recovery.
Addressing The Impossible History Match Problem: Using a Systematic Approach to Eliminate Model Bias
Authors: Yusuf Nurudeen Oluwatosin , Silpngarmlers Lynn , Eme Vincent O.
Published: October 2018

Cognitive biases are unconscious errors in judgement and decisions particularly those that are under conditions of uncertainty. The impact of bias in reservoir simulation can be reduced by validating model assumptions with a multidisciplinary team and sourcing required data that can help to resolve significant uncertainties.

This approach was utilized for Reservoir_E simulation study where bias in history match parameter was eliminated. In an initial history match attempt, assisted history match method was used to indicate that a single tank model solution was "impossible" for this reservoir. A two-tank history matched model was therefore proposed against prior geologic and engineering understanding of the reservoir. This bias was identified by a multi-disciplinary team after analyzing all available data. This led to a second history match effort which expanded the range of uncertainty parameters and got a good history match with a single tank, in line with understanding of reservoir architecture and flow mechanism. The single tank assumption was later validated with geochemistry analysis of oil samples from existing producers.

This paper demonstrates best practices in conducting reservoir simulation studies by showing the non-uniqueness of simulation models and the need to validate model assumptions using a multidisciplinary team and all available data.
Field Examples Demonstrating Applications of the Five Principles of Reservoir Management
Authors: Ezekwe Nnaemeka
Published: October 2018

The five principles of reservoir management are: 1. Conservation of reservoir energy. 2. Early application of simple strategies. 3. Sustained and systematic collection of data. 4. Implementation of improved technologies. 5. Long term retention of staff in multi-disciplinary teams. These principles can be combined with emerging technologies to devise and implement optimized reservoir management strategies.

Advances in technologies for optimization of reservoir management strategies have made significant advances in the areas of real-time reservoir monitoring, interval flow control, and downhole flow measurements. The petroleum industry can achieve real-time reservoir management by installing these revolutionary technologies to improve and optimize economic recovery of hydrocarbons.

Installations of downhole sensors and inflow control devices in many wells with data transmission/communication links have created a new class of smart/intelligent wells. Smart/Intelligent wells are equipped with devices that enable remote monitoring, control, and transmission of data from multiple zones thereby providing capabilities to reduce remedial costs and optimize reservoir performance. Data analytics can be used to ‘mine’ the huge data collected from these wells and fields and used to improve production processes.

Field examples that demonstrate applications of the five principles of reservoir management with installation of advanced technologies to improve reservoir management and hydrocarbon recovery are: 1. The Agbami Field, Offshore Nigeria 2. The 26R Reservoir in California, USA and 3. The Shaybah Field in Saudi Arabia.
RFID Zone Management and Barrier Control System
Authors: Flores Brennan
Published: October 2018

Throughout the last few decades, the oil and gas industry has made tremendous advancements in Safety. The number of safety incidents in the work place, especially fatalities, has significantly decreased. Industry leaders continue to strive to improve safety practices and procedures. Two of the largest threats facing personnel in the industry today are the exposure to "objects that drop from height "and "line of fire exposures". Targeted efforts such as Dropped object campaigns have been initiated to collectively address the dropped object exposure. Line of fire exposures associated with high-pressure temporary iron from piping and/or connection failures, exposing workers in the area have been managed through various methods. Although many efforts exist to mitigate these risks, none have been as effective as exclusion zones. Technical safety analysis often determines which areas pose threats to working personnel identified as an "exclusion zone", essentially mandating that an area be controlled by permit to work and stipulated by procedure.

I have developed a real-time tracking and feedback system that is capable of geo-fencing exclusion zones and recording any barrier breaks allowing technical safety professionals, front line supervisors and company representatives the opportunity to address the issues first hand and amend procedures and policies to improve their safety performance altogether. The concept offers a software platform that tracks personnel in real-time within isolated zones and immediately alerts personnel if a restricted zone is breached through an architecture of RFID readers and tags. Finally, the data can be processed in a way to provide valuable feedback to move towards a safer work behavior.

The software platform managed to successfully signal an alert and record the tag ID when a test subject crossed the RFID reader holding the RFID tag, proving the full-functionality of the barrier control system. The implementation of this system can be used to ultimately control the location and flow of personnel on platforms and rigs in order to make the oil and gas industry a safer environment.
Janus Nanoparticles for Enhanced Oil Recovery EOR: Reduction of Interfacial Tension
Authors: Giraldo Lady J.
Published: October 2018

Today, global energy demand increases significantly, but supply growth does not increase in the same proportion. The oil industry has been affected by the shortage of discoveries of new deposits of oil. Thus, it is compelling the development of cost-effective enhanced oil recovery (EOR) alternatives that allow the increase of the current hydrocarbons supply of actual reservoirs. Hence, the nanotechnology emerges as a good option as the use of nanoparticles and nanofluids has shown potential benefits in improving the efficiency of chemical treatments. Nevertheless, field applications of nanoparticles have been avoided due to current studies indicate that nanoparticles concentrations higher than 10,000 mg/L are needed, which disable the implementation due to high costs and the possibility of formation damage. Hence, the main objective of this study is the development for the first time of unconventional and engineered designed 0-D nanomaterials, namely NiO/SiO2 Janus nanoparticles that can be used for enhancing the oil recovery at low concentrations (~100 mg/L) without the risk of formation damage in the reservoir. These type of nanoparticles, due to its low size and 0-D characteristics, can improve the swept efficiency in the reservoir and increase the recovery. The primary mechanism of these nanomaterials is their strategic positioning at the oil/water interface and reduction of the interfacial tension. The Janus nanoparticles can migrate at the oil/water interface. The Janus-based nanofluids (nanomaterials dispersed in determined carrier fluid) flooding were assessed for reducing the interfacial tension (IFT), increasing the viscosity of the displacement phase, and altering the rock wettability, which impacts the capillary number and hence increases the crude oil recovery. The synthesized nanomaterials were characterized by TEM, stability, IFT, rheology, contact angle measurements and coreflooding tests under real reservoir conditions (fluids, pressure, temperature and rock samples) looking for flow assurance previous to a field trial. The results showed an increase of the capillary number at a very low concentration of 100 mg/L of both nanomaterials, mainly attributed to the decrease in the interfacial tension, which can lead to the increase of the oil recovery. Displacement tests using conventional SiO2 nanoparticles-based nanofluid at a concentration of 100 mg/L did not show an increase in oil recovery regarding the one obtained in the waterflooding step. Meanwhile, the nanofluid based on the engineering designed nanomaterials at the same concentration of 100 mg/L showed an increase in oil recovery up to 50%.
Experimental Study of Heavy Oil Recovery Mechanisms During Cyclic Solvent Injection Processes
Authors: Plata Maria
Published: October 2018

In recent years, the Cyclic Solvent Injection (CSI) process has shown to be a promising method for enhanced heavy oil recovery in Canada. CSI laboratory studies work for only 2 to 3 cycles due to low incremental oil in subsequent cycles. However, in field pilots the CSI keeps operational after many years. This study intends to capture the full production mechanisms responsible of heavy oil production in CSI to better understand the phenomena in field applications.

A physical sandpack model was used to test the CSI response. The sandpack was saturated with live heavy oil of 7900 mPa.s viscosity at 24 ° C, and primary production was run. Five CSI tests were then conducted to simulate the performance under the gravity effects. The experiments were conducted in a horizontal and vertical mode injection respectively at high and low-pressure depletion rates using 70 mol % CH4 and 30 mol % C3H8 solvent mixture. The sandpack was Computed Tomography (CT) scanned after every cycle to provide information about the gas and oil saturations evolution.

When CSI was run on the horizontal core, the incremental oil recovery was negligible for both slow and fast drawdown rates. When the sandpack was vertically flipped and rapidly produced, the three CSI cycles exhibited higher recover, and similar incremental recovery per cycle. This result indicated that even at high drawdown pressures, gravity segregation can effectively maximize the cross-flow mixing between solvent and heavy oil to penetrate the un-swept areas.

The results of this study demonstrate the importance of gravity drainage in the CSI process, and the relative significance of gravity forces on successful oil recovery rates. The results of this study illustrate the limitations of previous horizontal laboratory tests and show an improved test configuration for modeling and prediction of the improved response observed in CSI pilots.
Simulation of Network Fracturing in Tight Gas Formation with Coupled Shear Fracture Propagation Model
Authors: Li Mei
Published: October 2018

Hydraulic fracturing is one of the key technologies for effective exploitation of unconventional reservoirs such as tight gas, shale gas and coalbed methane. Discontinuities such as natural fractures and bedding are developed in these reservoirs, which makes them among the most technically complicated reservoirs. Significant amounts of oil and gas are often strapped within the matrix. Network fracturing techniques often implemented to increase the connectivity of matrix and natural fractures and enhance the production. Current techniques lack adequate understanding of complex propagation and distribution of hydraulic fractures in fractured formations, which precludes any meaningful optimization and prediction of the effect of fracturing treatment.

In this study, a fluid-solid coupled shear fracture network propagation model considering dual media, permeability anisotropy and stress sensitivity is built to simulate the fracture network morphology in tight gas formation. A quasi-continuous method is adopted to describe the discontinuous problem due to the pre-existing fractures, which greatly reduces the cost of calculation. The developed code is flexible enough to allow either shear fracturing of matrix or pre-existing fractures or secondary shearing of induced fractures to be examined on the basis of reservoir conditions during the fracturing process. Fracture morphology is acquired by examining the failure condition of each element which precludes presetting fracture propagation path.

Different cases of simulation will be presented to study some important features of fracturing in unconventional reservoirs on the basis of naturally fractured tight gas reservoir condition in of eastern Sichuan Basin, China. It is found that reservoir condition, like in-situ stress difference, significantly affect the width of fracture network. The hydraulic fractures prone to shear along the pre-existing fractures and the phenomenon became more obvious under smaller pre-existing fractures orientation condition. Besides, weak mechanical property of pre-existing fractures is conductive to the formation of complex fracture network.
Model-Based Cluster Spacing Optimization Increase Recovery and Profitability in Eagle Ford
Authors: Jones Miranda
Published: October 2018

Historical horizontal completions designs have very wide cluster spacing, leaving behind significant volumes of hydrocarbons. This paper develops a workflow for optimizing cluster spacing using simulated production curves in unconventional oil and gas fields. Optimizing cluster spacing reduces unstimulated reservoir rock left between widely spaced fractures, more efficiently draining the stimulated reservoir volume and increasing expected ultimate recovery and initial production. This paper illustrates the workflow developed by finding an optimal range for cluster spacing in the retrograde/wet gas region of the Eagle Ford. It is estimated that optimizing cluster spacing in this fluid window will increase ultimate hydrocarbon recovery by 20% and the net present value of each well by 50-60%.
Pore-Scale Investigation of the Effect of Surfactant on Fluid Occupancies during Low-Salinity Waterflooding in Oil-Wet Carbonates
Authors: Mirchi Vahideh
Published: October 2018

Numerous studies reveal a moderate incremental oil recovery by injection of brine with a lower ionic strength than the connate brine in oil-wet systems. However, the combination of low salinity with surfactant flooding has been reported to give a vastly higher oil recovery. Despite overlooked laboratory investigations in this area, the underlying displacement mechanisms for the superior oil recovery have not been fully understood. In other words, there is inadequate direct evidence on pore-level displacement mechanisms accountable for the additional recovery.

In this work we have employed a micro-CT scanner to observe the pore-scale fluid configurations for in-situ investigation of contact angles and local displacement patterns under elevated temperature and pressure conditions. We present the results of various experiments involving flow through porous media using different wetting fluid systems on a set of miniature limestone core samples. The brine solutions are chosen as to allow us to investigate the impacts of surfactant and salinity on their associated oil–brine flow behaviors during waterflooding experiments. The core samples are subjected to a dynamic aging process before commencement of waterflooding tests.

Characterization of local wettability reveal an accelerated reversal toward neutral wetness due to the low-salinity surfactant effects. The in-situ contact angles sharply change by injection of small pore volumes of low-salinity surfactant solution. This impact is more profound when injection is succeeding a low-salinity waterflooding. In this study, the main mechanism responsible for the enhancement of oil recovery appears to be the improvement of brine frontal advance displacement to smaller pore constrictions and to the corners of pore elements. This is found to be a result of fast surfactant-induced wettability transition to neutral-wet condition.
Approach to Improve Well Drilling Performance
Authors: Al Rubaii Mohammed Murif , Sehsah Ossama R. , Omini Eno
Published: October 2018

Hole cleaning and drilling rate remain major challenges once it comes to plan and drill workover and development wells. Inadequate hole cleaning is responsible for a large portion of all stuck pipe problems. Approximately 33% of stuck pipe incidents because of bad hole cleaning. The rate of penetration is extremely related to hole cleaning. If optimum hole cleaning can be ensured, that will lead to a high rate of penetration. To ensure perfect hole cleaning, it must be engineered. There are several correlations, mothed, designs, models, tools, charts, fields results, experimental studies and chemical materials to enhance the hole cleaning, but several of them are just based on theory and lack proper experimental data and not feasible in drilling operations. The knowledge of the size of cuttings, size of annulus, flow pattern, and down hole fluid properties cannot determined with high accuracy. This paper will show the influence of hole cleaning on the rate of penetration that will ensure optimum performance and mitigate stuck pipe problem and how the approach was applied during drilling operations. Knowledge from this paper will help in knowing hole cleaning more accurately and therefore facilitate improving drilling rate. The application of approach of Well drilling performance by using carrying capacity index and cuttings concentration in the annulus for ensuring perfect hole cleaning, and achieving enhanced well drilling performance by using optimum drilling parameters that can ensure minimum DSE. The Approach has been validated in the fields, and used to drill in challenging hole sections, and has improved the well drilling performance more than 55% and minimized DSE more than 54%.
Deterministic Blockmodeling of Two-Mode Binary Networks Using a Two-Mode KL-Median Heuristic
Authors: Brusco Michael , Stolze Hannah J. , Hoffman Michaela , Steinley Douglas , Doreian Patrick
Published: October 2018

Deterministic blockmodeling of a two-mode binary network matrix based on structural equivalence is a well-known problem in the social network literature. Whether implemented in a standalone fashion, or embedded within a metaheuristic framework, a popular relocation heuristic (RH) has served as the principal solution tool for this problem. In this paper, we establish that a two-mode KL-median heuristic (TMKLMedH) seeks to optimize the same criterion as the RH for deterministic blockmodeling. The TMKLMedH runs much faster than the RH, so many more restarts of the TMKLMedH can be accomplished when the two methods are constrained to the same time limit. Three computational comparisons of RH and TMKLMedH were conducted using both synthetic and real-world networks. In all three comparisons, the superiority of TMKLMedH was unequivocal.
Treatment efficacy of narrative family therapy for children and adolescents with diverse psychiatric symptomatology
Authors: Jørring Nina Tejs , Gjessing Jensen Karsten
Published: October 2018

Background: Little research has been undertaken on children and adolescents with psychiatric co-morbidity and this group is seldom subject to evidence-based treatment. Equally, there has been little research on creating an evidence base for Narrative Therapy, which means that narrative family therapy (NFT) is seldom available to children and adolescents with a psychiatric disorder.

Objective: A single group clinical design was used to examine the efficacy of NFT for children and adolescents with different diagnoses.

Method: Families receiving NFT from the Family Therapy Team (FTT) at the Child and Adolescent Mental Health Services (CAMHS) of the Capital Region of Denmark filled out psychometric measurements before and after treatment. Patients evaluated the burden of symptoms using Beck’s Youth Inventory (BYI), and parents evaluated their personal agency in relationship to their child’s psychiatric disorder using Parent Activation Measurement (PAM).

Results: We analyzed data from 48 patients and found a significant increase in median BYI measures of Self-Concept (40.5 to 46.0, p = 0.002) with an effect size of 0.60, decreases in BYI Depression Index (58.0 to 54.0, p = 0.030) with an effect size of –0.41, decreases in BYI Disruptive Behaviour Index (48.0 to 43.0, p = 0.030) with an effect size of –0.38, and a significant increase in PAM from 56.4 to 68.5, p = 0.001 with an effect size of 0.61.

Conclusion: Results from this study suggest that NFT has a direct positive effect on patients’ own evaluation of the burden of symptoms, and parents’ perceived personal agency regarding their child’s distress.
The Use of Multicolor Flow Cytofluorometry in White Blood Cell Differential: HematoFlow Conception
Authors: Lugovskaya Svetlana Alekseevna , Dyukov F.A. , Naumova E.V. , Bugrov I.Yu. , Kostin A.I.
Published: October 2018

Aim. To develop reference intervals for white blood cell subpopulations in peripheral blood using Cytomics FC500 flow cytometer and CytoDiff™ reagent (Beckman Coulter). Materials & Methods. The trial included the analysis of blood samples of healthy donors (n = 315) using Cytomics FC500 flow cytometer and CytoDiff™ reagent cocktail composed of 6 antibodies in 5 colors (CD36-FITC, CD2-PE, CD294-PE, CD19-ECD, CD16-Cy5, CD45-Cy7) and enabling to count 17 cell populations. Results. The data obtained by means of multicolor flow cytofluorometry included the reference values of white blood cell populations in peripheral blood. In 1 first-time donor a lymphoproliferative disease was detected. It was subsequently confirmed by immunophenotyping; B-cell chronic lymphocytic leukemia was diagnosed. Conclusion. Multicolor flow cytofluorometry using CytoDif-f™ is considered to be a new step toward an improved WBC differential evaluation aimed mainly at reducing the volume of blood smear analysis using light microscopy at large laboratories, enhancing objectivity, precision and reproducibility of results. WBC differential extended with the count of lymphocyte and monocyte subpopulations can be regarded as modern donor blood screening to detect changes in the pattern of lymphocyte subpopulations as grounds for further examination of donors.
Main Nutritional and Environmental Risk Factors in Children with Leukemia from a Public Hospital of the State of Guanajuato, Mexico
Authors: Monroy-Torres Rebeca , Ibarra-Miranda Daniela , Sánchez Jaime Naves , Castillo-Chávez Angela
Published: October 2018

Introduction::

The prevalence of leukemia in children aged under 19 years continues to
increase. Nutritional and environmental factors have been described as causes of their development,
and maternal breastfeeding, birth weight, exposure to cow’s milk or to contaminants before
1 year of age, and smoking have been studied.

Objective::

To analyze the main nutritional and environmental risk factors in children with Acute
Lymphoblastic Leukemia (ALL) in a public hospital in Guanajuato, Mexico.

Methods::

Analytical and cross-sectional study on 30 children under 18 years of age, with a confirmed
diagnosis of ALL in a public hospital in Guanajuato, Mexico. With the signed informed
consent of the children’s parents, a questionnaire was applied that collected and in which nutritional
risk factors (weeks of gestation and birth weight, breastfeeding, exposure to cow’s milk)
and environmental factors (smoking and exposure to arsenic) were evaluated. The frequencies and
Odds Ratios (OR) of the main nutritional and environmental risk factors were obtained.

Results::

Mean age was 8 ± 4 years with 38 ± 1 weeks of gestation, with a birth weight of 3,200 g
(range, 2,500-4,800 g). Fifty percent of the children consumed cow’s milk during their first year
of life (40% before 6 months of age); 33.3% received maternal milk for ≤6 months and 63% of the
parents had a positive smoking habit, with 66.6% of the participants living in cities with arsenic
levels falling outside of the norm.

Conclusion::

The main nutritional and environmental risk factors found were early complementary
feeding, cow’s milk prior to 1 year of age, a duration of breastfeeding of fewer than 6 months,
birth weight of >3,500 g, a positive smoking habit in the children’s parents, as well as exposure to
arsenic in drinking water. Identification of these risk factors could constitute an input for integrating
novel prevention alternatives and the nutritional management of leukemia.
Analisis Rantai Pemasaran Kayu Sertfikasi FSC Di Kabupaten Kulon Progo
Authors: Wiyono Wiyono , Oktalina Silvi Nur , Hidayat Rochmat
Published: October 2018

Forest certification is a market-based policy instrument aimed to ensuring that any traded timber is legal and derived from sustainably managed forests. Forest certification is not only applied to large scale forest management but also small scale such as community forest. This study aims: (1) to know the pattern of marketing chain of certified timber; (2) to know the actors involved in the marketing of certified timber; (3) to know the marketing constrains of certified timber faced by farmers. This research was conducted at Wana Lestari Menoreh Cooperative (KWLM) in Kulon Progo Regency. KWLM is a community forest cooperative that has successfully obtained a certificate of sustainable forest management with Forest Stewardship Council (FSC) standard since 2011. Data collection is done by: (1) in-depth interviews to actors involved in marketing of certified wood; (2) observation of each stage of certified timber marketing chain; (3) study documents related to marketing chain of certified timber. Data then analyzed descriptive method. The results show that: (1) the pattern of marketing chain of certified wood is simpler than non certified timber; (2) The actors involved in the marketing chain of certified timber are farmers, harvester, cooperation, PT SOBI, wood processing industry; (3) The major constraint faced by farmers in marketing of certified timber is a payment that do not made in cash as done by non-certified timber trader.
Pemetaan Erodibilitas Tanah Dan Korelasinya Terhadap Karakteristik Tanah Di Das Serang, Kulonprogo
Authors: Ayuningtyas Efrinda Ari , Ilma Ainul Fahmi Nur , Yudha Rindhang Bima
Published: October 2018

Soil erosion was happened caused by many factors, such as rainfall intensity, soil erodbility, steepness and length of slope, land cover, and conservation practices. In other case, the soil properties also influence the vulnerability of soil to be detached. This soil properties characteristics is classified as soil erodibility. Erodibility factor (K) from the Universal Soil Loss Equation (USLE) in this study was the result of soil erodibility estimation or soil capability to be dispersed by rain. K factor was affected by soil organic, soil permeability, soil structures, and soil textures. This study was contributed in Serang Watershed because of the main fuction of this watershed to supply water resources especially in Sermo Reservoir in Ngrancah Subwatershed. This reservoir was used to distribute water and irrigation to all Kulonprogo District and especially to keep the sustainability of sedimentation of soastal area di Glagah Beach. All of soil properties was collected in each landform of Serang Watershed and was analyzed by laboratory measurement. By using K factor formula, the K value can be estimated. Geographic Information System (GIS) tools were used to map and represent the spatial information of soil erodibility of Serang Watershed. The result of this study showed that the high value of K factor was distributed in the area which has genesis of structural, denudated structural, and sedimented denudational. Furthermore, this study can be strived to analyze soil erosion hazard which was influenced by soil erodibility.
Polarización y pluralismo en la teoría de la hegemonía de Ernesto Laclau.
Authors: Barros Sebastián
Published: October 2018

La teoría de la hegemonía de Ernesto Laclau ha recibido críticas por su definición antagónica de la política y la consiguiente reducción del pluralismo que resultaría de la misma. El objetivo de este artículo es discutir, a partir de dos comentarios críticos, las derivas populistas de la teoría de la hegemonía para intentar precisar el problema de la polarización política. Para lograr este objetivo se comienza con una discusión sobre el problema de la polarización y su relación con la idea de pluralismo. Eso lleva a problematizar las nociones de equivalencia y de significante vacío para luego centrar su atención en la existencia de distintos niveles de heterogeneidad. Por último, el artículo apunta a precisar el análisis de las múltiples formas que puede adquirir la relación entre diferencias, lo cual debería alejarnos de la binarización a la que tiende la teoría de la hegemonía de matriz gramsciana.Abstract: Ernesto Laclau’s theory of hegemony has been criticized with regard to its antagonistic definition of politics and the consequent reduction of pluralism. Based on two critical readings of the theory, the paper aims at discussing its populist drift in order to specify the problems of political polarization. In the first place, it tackles polarization and its relation to pluralism. Thence, it leads to problematize the notions equivalence and empty significant and then concentrate on the various levels of heterogeneity within the framework of the theory. Finally, it examines the multiple possible forms of relationship among differences that should avert the tendency towards binary logics in a Gramscian theory of hegemony.
Trayectorias populares e intervención populista en América Latina.
Authors: Pizzorno Pablo
Published: October 2018

En el contexto de retroceso de las experiencias populistas de los últimos años en Latinoamérica, distintos autores han intentado hacer un balance de este ciclo a partir de una comparación con los populismos clásicos latinoamericanos. Recreando una serie de lecturas clásicas realizadas principalmente desde el marxismo, estas miradas sostienen que la intervención populista ha estado destinada principalmente a impedir el desarrollo político autónomo de las clases populares. En este artículo se intenta problematizar la visión de los populismos latinoamericanos que subyace en dichas miradas y, en ese sentido, propone una relectura de los orígenes del peronismo y el varguismo, que pone el acento en la constitución política e identitaria de las clases populares a través de la intervención populista.Abstract: In the context of the later years crisis of Latin American populist governments, some authors have tried a comparison between these and classic populisms in the region. Recreating classic interpretations inspired by Marxist theory, these views state that the populist intervention has been destined mainly to prevent the autonomous political development of the popular classes. This paper aims to problematize the vision of the Latin American populisms that underlies these views and proposes an interpretation of the origins of Peronism and Varguism that underlines the political and identitary constitution of popular classes through populist intervention.
Experiencias comunitarias en defensa del agua en distritos rurales de Puntarenas, Costa Rica (2005-2017)
Authors: Villalobos Villalobos Dany
Published: October 2018

La progresiva disminución hídrica en el cantón Central de Puntarenas se hatraducido durante los últimos años en conflictos. Ante este escenario, personas de diferentes pueblos se han organizado y coordinado acciones para cambiar el modelo actual de explotación y distribución injusta del agua. En este artículo se describen los conflictos a partir del trabajo realizado por el autor desde 2013 al presente con organizaciones de la zona. Dentro del repaso, se profundizará en el conflicto de Guacimal, que ha puesto en evidencia las dificultades que enfrentan los actores comunitarios para defender este bien público en el actual modelo de gestión institucional del agua.
Un problema de las Ciencias Sociales latinoamericanas: sobre los orígenes supuestos y los reales
Authors: Cueva Perus Marcos
Published: October 2018

Este artículo busca demostrar el peso de la fenomenología de Husserl y de una determinada posición epistemológica no explicíta en el quehacer actual de las ciencias sociales latinoamericanas. En algunas de sus corrientes, este quehacer inicia de posiciones erróneas sobre la herencia histórica colonial latinoamericana y no permite captar la singularidad de la región, que pasa por la herencia de la religión y no por la del cartesianismo. Dado que esa fenomenología privilegia la vivencia, situada entre el empirismo y el formalismo, se presta, junto a la ausencia de praxis en el “conocimiento”, para una forma de mercantilización de la ciencia en un mundo en el cual el “mercado” también llama a consumir vivencias.
Survei Status Gizi (IMT), Kebugaran Jasmani Siswa SMPN 1 Marioriawa Kabupaten Soppeng Provinsi Sulawesi Selatan
Authors: Burhanuddin Sudirman
Published: October 2018

Penelitian deskriptif ini bertujuan untuk mengetahui status gizi dan kebugaran jasmani siswa SMPN 1 Marioriawa Kabupaten Soppeng Propinsi Sulawesi Selatan tahun ajaran 2016/2017. Sampel dalam penelitian ini berjumlah 30 orang. Teknik penentuan sampel adalah dengan cara simple random sampling. Teknik analisis data yang digunakan adalah analisis deskriptif dan analisis deskriptif frekuensi krostab. Hasil penelitian menunjukkan bahwa status gizi siswa SMPN 1 Marioriawa dalam kategori baik dalam ambang normal dan kebugaran jasmani siswa SMPN 1 Marioriawa dalam kategori baik atau sebesar 46,67%.
PEMANFAATAN HASIL MODIFIKASI PEMBELAJARAN PENDIDIKAN JASMANI DI SLB-YPAC CABANG MEDAN
Authors: Bangun M.Wanda Aginta
Published: October 2018

Tujuan penelitian ini adalah untuk mengetahui bagaimana pemanfaatan hasil modifikasi pembelajaran pendidikan jasmani SLB-YPAC Cabang Medan. Metode penelitian dilakukan dengan menggunakan tehnik survey yang menggunakan observasi, wawancara, dan dokumentasi. Jumlah sampel dalam pelaksanaan penelitian ini sebanyak 1 orang, yakni guru pendidikan jasmani. Instrumen penelitian yang digunakan oleh peneliti adalah dengan mengobservasi, wawancara, yang menggunakan angket ditujukan hanya untuk guru pendidikan jasmani, serta dengan menggunakan dokumentasi. Hasil analisis data yang menggunakan tehnik presentase menunjukkan bahwa proses pemanfaatan hasil modifikasi pembelajaran pendidikan jasmani di SLB-YPAC Cabang Medan sudah baik. Dimana guru pendidikan jasmani telah memodifikasi dan dapat memanfaatkan hasil modifikasi pembelajaran pendidikan jasmani tersebut dengan baik. Pemanfaatan hasil modifikasi pembelajaran pendidikan jasmani di SLB-YPAC Cabang Medan adalah dalam katagori tinggi.