bluuebunny/crossref_metadata_2025 huggingface dataset:
Assessment of the Relationship Between Thinness Expectations, Body Satisfaction and Eating Attitude and Behavior
Authors: Alim Nural Erzurum , Beşler Zehra Nur , Çalışkan Gözde , Göküstün Kerim Kaan
Published: November 2021

Background: Body dissatisfaction is more common in adolescents and its prevalence is increasing in developed and developing countries. These situation is associated with unhealthy dieting behaviors. Purpose: This study aimed to evaluate the relationship between thinness expectations, body satisfaction, and eating attitudes and behaviors in interpersonal interaction.Method: This study was conducted on 372 university students. The survey form was prepared using the Google Surveys Program. In the questionnaire form, there are sociodemographic characteristics, anthropometric measurements, Interpersonal Outcome Expectancies for Thinness (IOET), Nutritional Changes Process Scale (NCPS), and Body Shape Questionnaire (BSQ).Result: There was no statistically significant difference in the mean total scores of the IOET, BSQ, and NCPS scales according to gender (p > 0.05). According to the NCPS scale sub-dimensions, it was determined that the means scores of dramatic relief and social liberation were higher in females than males (p < 0.05). However, the mean scores of reinforcement management, stimulus control, interpersonal control systems, and substance abuse were lower in females than males (p < 0.05). In addition, when the distribution of thinness was examined in the relationships with family, other family members, teachers, friends, colleagues, and foreigners according to gender, it was determined that there was no statistically significant difference (p > 0.05). The findings show that there were moderate and strong positive correlations between the total score of BSQ and NCPS, and IOET total scores, respectively (p < 0.05).Conclusion: According to the study results, body shape is important in interpersonal relationships among university students and body dissatisfaction may be related to eating behaviors.
Relationship between Body Mass Index (BMI) and Anemia Among Adolescent Indonesian Girls (Analysis of The Indonesia Family Life Survey 5th Data)
Authors: Enggardany Rieza , Hendrati Lucia Yovita , Hairi Noran Naqiah
Published: November 2021

ABSTRACTBackground: Anemia is a condition characterized by low levels of hemoglobin (Hb) from normal limits. Anemia is still a public health problem. Data states that the prevalence of anemia in Indonesia in 2013 was 21.7%, with the number of sufferers known to be higher in women than men. The prevalence of anemia in the age range 15 to 24 years was 18.4%. Nutritional status shows the balance of nutrients due to the consumption, absorption, and use of nutrients that come from food in the body. A person's nutritional status can be said to be deficient if the body lacks intake of one or more essential nutrients for the body. One of the indicators for assessing a person's nutritional status is the Body Mass Index (BMI). Inadequate nutritional status will affect the nutritional status of iron in a person' s body so that it can be interpreted that nutritional status is one of the factors of anemia. Consuming foods with good nutritional value, especially foods that contain high iron will also affect the nutritional status of these adolescents so that the risk of suffering from anemia will decrease.Objective: This study aims to analyze the relationship between body mass index and anemia among young women in Indonesia.Methods: This study is a cross-sectional study. The data used are secondary data from the Indonesian Family Life Survey (IFLS) 5. The population of this study was all Indonesians who participated in IFLS 5. The sample used in this study amounted to 3,525 respondents. IInclusion criteria of this study included female, aged 10-18 years, unmarried, having complete data regarding body weight, height and hemoglobin measurement results. If data related to the measurement results of hemoglobin, body weight, height are incomplete, they will be excluded.The statistical test was used is a chi-square test.Results: There was a relationship between Body Mass Index (BMI) and anemia among young women in Indonesia (p = 0.034 <0.05).Based on the odd ratio analysis using the normal Body Mass Index (BMI) group as a comparison, it is known that young women with underweight BMI categories have a 1.198 greater risk of experiencing anemia than girls with normal BMI categories.Conclusion: There is a relationship between BMI and anemia in adolescent girls. It is important for young women to always pay attention to daily iron intake by eating foods that are rich in iron or taking blood-booster tablets (TTD) to avoid anemia.
Adult Male’s Penile Size Measurement and Its Affecting Factors
Authors: Wijanarko Mikhael San Putra , Stella Cathelin , Oktavianto Gian
Published: November 2021

Background: In the general population, it is estimated that 91% of adult males perceive their penile size to be smaller than average. Concern about penile size can affect one’s self-esteem, which then affects its sexual function, satisfaction, as well as physical and mental health. Therefore, accurate penile measurements are needed for clinical and academic purposes.
Reviews: Measurement of penile size can be performed in an erect, stretched, even flaccid condition. However, from various researches, there is no standardization of such a measurement method. Various researches have carried out average penile measurement but many factors can affect these results such as race, genital conditions, systemic diseases, surgical procedures, and aging. 
Summary: There is no internationally agreed way of measuring an adult male's penis and many other factors can make the results of penile measurements vary. Proper measurement and finding out the right average of penile size in adult male with regard to other affecting factors, will be indispensable for both clinical and academic purposes.
How to Improve Safety Commitment: A Case Study on a Plastic Manufacturer in East Java
Authors: Suherdin Suherdin , Widajati Noeroel , Qomaruddin M. Bagus
Published: November 2021

Introduction: Every year, work accidents frequently occur at PT. X. The initial survey showed a lack of control and commitment to be the main problems. Commitment is the core of the implementation of Occupational Health and Safety (OHS). This study aims to determine the factors that can increase safety commitment of workers. Method: This study used a quantitative approach with a cross-sectional design. In this study, the independent variables were age, gender, years of service, education level, safety motivation, management of safety commitment, safety communication, and social support. Meanwhile, the dependent variable was the safety commitment. 78 workers were selected using a simple random sampling technique from a population of 395 workers. Questionnaires were used to collect data. Data analysis used a multinomial logistic regression test. Results: 64.1% of workers were aged 41-51 years old, 56.4% were females, 82.0% had >10 years of service, 75.6% had a secondary education level, 56.4% had high safety motivation, 57.7% assessed management commitment to safety as low, 59.0% assessed safety communication as less, 52.6% had high social support, and 37.2% tended to have continuous safety commitment. Characteristics of workers (age, gender, years of service, education level), safety motivation, and social support did not affect safety commitment. Meanwhile, management commitment to safety (p=0.004) and safety communication (p=0.014) affected safety commitment of workers. Conclusion: The way to increase workers' commitment to safety is to increase the company's commitment to OHS and improve safety communication efforts.Keywords: management commitment to safety, safety commitment, safety communication
Exploring the Determinants of Intention to Quit and Awareness Regarding Ill Effects and Control Policies of Tobacco among Health Workers of a Tertiary Care Hospital in North India
Authors: Prasad Nidhi , Bharati Dharamvir Ranjan , Choudhary Sanjay Kumar , Kumar Binay
Published: November 2021

Introduction: Sociodemographic factor, awareness of the health effects and legislative law can lead to an increase in cessation of tobacco. Tobacco related knowledge and awareness are found to be better in people working in the health care sector as compared to the general population. The objective of the study was to find the prevalence of quitting rate amongst the health workers and perceived harmful effects on health, tobacco types and awareness of the anti -smoking legislation law in India among the health care workers working in a tertiary care hospital. Methods: A cross-sectional study was conducted among 306 hospital staff (196 housekeeping staff and 110 nursing orderlies) at a tertiary care hospital of Faridabad in 2018. Convenience sampling was conducted, and data were collected through pre tested semi structured questionnaires on sociodemographic details, awareness of ill effects of tobacco and intention to quit. Results: Among 133 current tobacco users, intention to quit smoking was present in only 96 respondents (72.18%). There was association between age, marital status and type of family with the intention to quit. 63 respondents (21%) were unaware that smoking causes lung cancer and 115 (38%) of the total respondents did not consider smokeless tobacco as a causal risk factor for cancer. A total of 180 respondents (58.8%) were not aware of anti-tobacco control laws in India. Moreover, it was found that health concern was commonest reason of intention to quit. Conclusions: Intention to quit tobacco among study participants was low, so there is need to look for knowledge gaps about harms of different types of products and anti-tobacco legislation. More comprehensive tobacco cessation services should also be prioritized in the heath sector.Keywords: awareness of ill effects, COTPA, India, intention to quit, tobacco
BONE ALUMINUM AS A BIOLOGICAL MONITORING OF OCCUPATIONAL EXPOSURE TO ALUMINUM
Authors: Monintja Keyne Christa , Ilyas Muhammad
Published: November 2021

ABSTRACTThe current proposed biological monitoring of aluminum is based on the analysis of aluminum concentration in blood/serum or in urine, but both considered to be reflective of short-term exposure. Based on its toxic kinetics, aluminum has been demonstrated to be accumulated in the bone. The aim of this study is to find out whether by analyzing bone aluminum, we might have an overview of aluminum accumulation that might cause health problems in the future. This review was conducted through a method of search and selection of articles from Pubmed, Cochrane Library, and Google Scholar databases aimed to answer question rising from the problem statement of this study. The process of searching articles used the keywords “occupational aluminum” OR “bone aluminum” AND “biological monitoring” OR “biomonitoring”. The selection of articles was performed using the defined inclusion and exclusion criteria. Initially, 61 articles were obtained, but after the selection process and hand searching, four articles remained consisting of two case reports and two cross sectional studies. Based on the selected evidence-based resources, bone can be a promising potential biomarker of aluminum, especially for cumulative exposure assessment. The use of in vivo neutron activation analysis (IVNAA) or X-ray fluorescence (XRF) technology for the purpose of noninvasively quantifying aluminum concentration in the bone, is suitable enough to be performed in occupational settings. Keywords: Bone aluminum, occupational exposure, IVNAA, XRF, biomonitoring, biological monitoring
THE CORRELATION AVAILABILITY NURSES AND EQUIPMENT WITH ACUTE MISSED NURSING CARE AT HOSPITALS
Authors: Putra Kuswantoro Rusca , Dewi Fajar Mulia , Rahmayanti Asih Devi , Budiati Ani
Published: November 2021

Background: One of the nurse’s roles is to provide nursing care regards of patient safety, consistently and timely.  The availability of nurses and equipment can be considered as a primary constraint contributing to acute missed nursing care.Aims: This study aimed to determine the correlation between the availability of nurses and equipment with incidences of acute missed nursing care in medical and surgical wards at hospitals.Methods: This study used quantitative research with a cross sectional approach. This research was conducted at six private hospitals in Malang from October 2020 to November 2020. The population in this study were selected using consecutive sampling, and the study sample consisted of 206 nurses. The acute MISSCARE Survey was used to collect data. The relationship between the availability of the number of nurses and equipment with acute missed nursing care was analyzed by applying SPSS version 26 with the Spearman test.Results: The relationship between the availability of nurses and acute missed nursing care yielded results of ρ = 0.016 (<0.05) and R = -0.168. Equipment availability and acute missed nursing care had values of ρ = 0.026 (<0.05), and R = -0.155.  This shows correlation between the availability of the number of nurses and equipment with incidences of acute missed nursing care.Conclusion: The availability of the number of nurses and equipment are the reasons for the incidence of acute missed nursing care. Therefore, nursing managers are needed in managing and allocating the necessary number of nurses and equipment.Keywords: equipment, missed nursing care, nurse
ECONOMIC EVALUATION FOR HEALTH ADVOCACY AND INFORMED POLICY
Authors: Dahlui Maznah , Rochmah Thinni Nurul , Ernawaty Ernawaty , Chalidyanto Djazuly
Published: November 2021

Background: Healthcare resources are limited therefore, adequate, appropriate and timely allocation of resources are important. Decision to invest on health care program can be made from the analysis of the information obtained on the cost and consequences of the various alternative health programs, often known as economic evaluation of health interventions.Aims: This write-up emphasizes on the importance of evidence driven policy of health intervention whereby economic evaluation should be performed to indicate whether investment on health intervention would benefit the country.Methods: Literature review on economic evaluation studies conducted by the first author during her 14 years tenure as academician had been performed. Various studies which applied the cost-effectiveness analysis tools to economically evaluate health interventions and programs in Malaysia and other countries are shared.Results: The economic evaluation studies cut across different programs such as disease prevention and treatment, public health monitoring and control, and implications of health issues to the healthcare system. Many of the findings have been used for advocacy to shape the delivery of more effective health intervention programs in the country.Conclusion: The country will benefit from economic evaluation studies which could provide evidence to assist in policy making on health programs for the country.Keywords: economic evaluation, health programs, policy making
The Impact of Peer-to-Peer (P2P) Lending on Business Development of Small and Medium-Sized Enterprises
Authors: Suryawati Rindah Febriana , Nurdana Duhita Paramaramya Putri
Published: November 2021

The problem faced by most micro-entrepreneurs in Indonesia is financing business. Peer-to-peer (P2P) lending is a non-bank financial institution that can be an alternative source of financing because of the requirements and easy application usage. This study aims to analyze the impact of peer-to-peer lending on business expenses, business turnover, total employment, total sales of products, and profits before and after obtaining a peer-to-peer lending loan and analyze factors affecting the increase in business turnover after getting a loan through peer-to-peer lending. The methods used in this study include the descriptive analysis method, paired t-test, and ordinary least square (OLS). The paired t-test results indicate that there is a significant difference between business expenses, business turnover, the amount of labor, the number of product sales, and profit before and after obtaining a peer-to-peer lending loan. The result of analysis with the OLS method shows that the length of business and expenditure of the business has a significant effect on the development of respondents' business turnover.
Association of Computer Tomography Features Of COVID-19 with Outcomes, Clinical and Laboratory Parameters
Authors: Melekhov A. V. , Sayfullin M. A. , Petrovichev V. S. , Agaeva A. I. , Golubykh K. Y. , Nikitin I. G.
Published: November 2021

Aim: to assess the results of chest computer tomography (CT) of patients with novel coronavirus infection in correspondence with their outcomes, clinical and laboratory data. Methods: retrospective analysis of 962 chest CT scans, outcomes, clinical and laboratory data of all 354 COVID-19 patients hospitalized from April to June 2020. Results: Sensitivity and specificity of CT with polimerase chain reaction (PCR) as a reference were: 98.0 % and 5.7 % respectively; for PCR with CT as a reference: 54.6 % and 70.7 % respectively. Patients with positive and negative PCR tests had no significant differences in mean CT score and CO-RADS score. Cumulative survival was better in patients with lower CT score (significant only for maximal, not baseline scores). CT score changed during hospitalization in survived patients clinically insignificant (from 2 (1-2) to 2 (1-2), p=0.001), and increased in dead (from 2 (1,5-3) to 4 (4-4), p <0.001). Lower CT score and better survival was in females, patient younger than 59 years, with NEWS score <3, without atrial fibrillation. Diabetes mellitus and obesity was associated with higher CT score, but not with survival. Chronic obstructive pulmonary disease, coronary heart disease and chronic heart failure was associated with lower survival, but not CT score. Conclusion: chest CT significantly increases diagnostic accuracy and assessment of the prognosis in COVID-19 patients.
Differential Diagnosis of Pneumonia as a Complication of Nasal Liquorrhea in the Context of the COVID-19 Pandemic
Authors: Shelesko E. V. , Sharipov O. E. , Chernikova N. A. , Ershova O. N. , Kalinin P. L. , Kutin M. A. , Fomichev D. V.
Published: November 2021

Nasal liquorrhea — the outflow of cerebrospinal fluid from the cerebrospinal fluid spaces of the cranial cavity into the nasal cavity or paranasal sinuses due to the presence of a congenital or acquired defect in the bones of the skull base and meninges of various etiologies. Nasal liquorrhea leads to potentially fatal complications: meningitis, meningoencephalitis, pneumocephalus, brain abscess. Also, with nasal liquorrhea, less dangerous complications may occur: aspiration bronchopneumonia and gastritis. The article presents a case of aspiration pneumonitis in two patients with nasal liquorrhea treated at the N.N. N.N. Burdenko during the COVID-19 pandemic. Both patients noted the profuse nature of the nasal liquorrhea, complained of coughing in a horizontal position. In both cases, no RNA virus (SARS-CoV-2) was detected during the polymerase chain reaction. Antibodies (IgG, IgM) to coronavirus were not detected. Computed tomography of the chest organs in both cases revealed areas of frosted glass darkening. Since no data was obtained for coronavirus infection (negative tests for coronavirus, lack of antibodies), changes in the lungs were interpreted as a consequence of constant aspiration of cerebrospinal fluid. The patients were admitted to a separate ward. Both patients underwent endoscopic endonasal plasty of the skull base defect. The postoperative period in both cases was uneventful. In both cases, the patients underwent computed tomography scan of the chest organs one month later. On the photographs, the signs of pneumontis completely regressed.
Tradução
Authors: Castelo Branco Judikael
Published: November 2021

Tradução do texto de Ferruccio Andolfi
Princípio de permanência da substância e reações químicas
Authors: Vieira Coutinho Abreu Gomes Írio
Published: November 2021

Esse artigo investiga um possível contraponto à primeira analogia kantiana: as reações químicas. Para tanto se define lei de conservação em geral de acordo com o entendimento da ciência. Essas leis tem uma forma definida constante para todas elas e conteúdos que as diferenciam. Explica-se a primeira analogia da experiência ou doutrina da substância de Kant mostrando que qualquer mudança que notamos em nossas percepções num dado evento, só é possível se algo nesse mesmo evento não sofrer mutação. O elo de ligação da doutrina da substância com as equações químicas é feito a partir do exemplo da queima da lenha na CRP de Kant. Para descobrir qual seja a substância de qualquer evento (inclusive reações químicas) aborda-se a diferença entre pesquisa transcendental (filosófica) e pesquisa empírica (científica). A pesquisa empírica é entendida como subordinada à pesquisa transcendental, dessa maneira prova-se que a química é compatível com a doutrina da substância de Kant.
Eric Weil e la «fine della storia»
Authors: Raimondi Edoardo
Published: November 2021

O artigo visa mostrar como Eric Weil (1904-1977) recompreendeu a famosa tese do “fim da história”, elaborada por Alexandre Kojève (1902-1968) desde os anos de 1930, propondo uma nova versão de caráter essencialmente “kantiano pós-hegeliano”: um elemento teórico fundamental do inter histórico- filosófico weiliano, que emergiria claramente dos estudos específicos sobre Kant aos quais Weil se dedicou de modo pontual a partir da década de 1960.  Veremos, portanto, como as reviravoltas “práticas” de tal recompreensão tenham de fato indicado a estrada para a constituição de uma nova filosofia política, eminentemente crítica e antidogmática.
Collapsing electoral integrity in Mozambique
Authors: Hanlon Joseph
Published: November 2021

Excessive secrecy has always compromised the integrity of Mozambique’s elections. The National Elections Commission secretly changes results with no records kept nor any public notice that changes have been made. The official final results of the 2019 elections were changed three times by the Constitutional Council with no comment and identical document numbers. The political parties want a politicised electoral machine with party nominees to all electoral bodies, and integrity has steadily declined. By 2018-9 elections had become dominated by the ruling party, Frelimo, which was able to openly change the outcome of municipal elections and create 329 430 ghost voters in the national elections. Civil society observers had become an important check on elections; but in 2019, independent observation was blocked in several provinces and the head of civil society observation in one province was assassinated by a police hit squad. The judiciary, which ordered a rerun in one town in the 2013 municipal elections, has become politicised and will no longer intervene. This paper is an empirical account of those events.
Elections, Legitimacy, and Democratic Consolidation in Southern Africa Lessons from Zambia, Zimbabwe and Malawi
Authors: Siachiwena Hangala , Saunders Chris
Published: November 2021

Regular elections are now the norm across most of sub-Saharan Africa, but repeated elections have not guaranteed the consolidation of democracy. Election legitimacy is crucial for democratisation. When losing political actors and their supporters are not satisfied with the electoral process, there is potential for growing political tensions. Fraudulent or controversial elections fail to confer legitimacy on the winners, and undermine the integrity of elections and democracy. Drawing on Afrobarometer data and media accounts, this paper focuses on the most recent elections held in three southern African countries: Zambia, Zimbabwe and Malawi. We show that when citizens believe that elections were not free and fair, there is a decline in their satisfaction with democracy and the trust they have in institutions such as electoral commissions and courts of law. The absence of political reforms to address disputed election outcomes increases the likelihood that future elections will not be contested fairly. This sets countries on a path of democratic decline rather than consolidation.
Information Science: Fields and Technological Issues & Challenges in Developing & Developed Nations
Authors: Paul P. K. , Aithal P. S. , Saavedra R. , Tiwary K.S. , Aremu B. , Mewada S.
Published: November 2021

Information is the power and Technology is the driving force for the development of all the facets. Information Science and Technology as a field of study and professional practice is therefore responsible for providing information and technology solutions to different organizations, institutions, sectors, fields, and even to individuals. Information Science and Technology is an emerging field and interdisciplinary in nature that has already been gathered from previous sources and chapters. Information Science and Technology is very diverse and treated in different perspectives viz. information, technological solutions, domain-specific solutions, and so on. Regarding the technologies, it also holds wider coverage in tools, techniques, systems, and technologies. Though Information Science and Technology is available with different names there are certain reasons for the development of each nomenclature/ subject. This paper has discussed the issues and suggestions regarding Information Science in its educational and technological context.
Revised Maximum Depositional Age for the Ediacaran Browns Hole Formation: Implications for Western Laurentia Neoproterozoic Stratigraphy
Authors: Provow Ashley W. , Newell Dennis L. , Dehler Carol M. , Ault Alexis K. , Yonkee W. Adolph , Thomson Stuart N. , Mahan Kevin H.
Published: November 2021

Constraining the depositional age of Neoproterozoic stratigraphy in the North American Cordilleran margin informs global connections of major climatic and tectonic events in deep time. Making these correlations is challenging due to a paucity of existing geochronological data and adequate material for absolute age control in key stratigraphic sequences. The late Ediacaran Browns Hole Formation in the Brigham Group of northern Utah, USA, provides a key chronological benchmark on Neoproterozoic stratigraphy. This unit locally comprises <140 m of volcaniclastic rocks with interbedded mafic-volcanic flows that lie within a 3500 m thick package of strata preserving the Cryogenian, Ediacaran, and the lowermost Cambrian history of this area. Prior efforts to constrain the age of the Browns Hole Formation yielded uncertain and conflicting results. Here, we report new laser-ablation-inductively-coupled-mass-spectrometry U-Pb geochronologic data from detrital apatite grains to refine the maximum depositional age of the volcanic member of the Browns Hole Formation to 613±12 Ma (2σ). Apatite crystals are euhedral and pristine and define a single date population, indicating they are likely proximally sourced. These data place new constraints on the timing and tempo of deposition of underlying and overlying units. Owing to unresolved interpretations for the age of underlying Cryogenian stratigraphy, our new date brackets two potential Brigham Group accumulation rate scenarios for ~1400 m of preserved strata: ~38 mm/kyr over ~37 Myr or ~64 mm/kyr over ~22 Myr. These results suggest that the origins of regional unconformities at the base of the Inkom Formation, previously attributed to either the Marinoan or Gaskiers global glaciation events, should be revisited. Our paired sedimentological and geochronology data inform the timing of rift-related magmatism and sedimentation near the western margin of Laurentia.
Negation of Conditionals in Natural Language and Thought
Authors: Gomes Gilberto
Published: November 2021

External negation of conditionals occurs in sentences beginning with ‘It is not true that if’ or similar phrases, and it is not rare in natural language. A conditional may also be denied by another with the same antecedent and opposite consequent. Most often, when the denied conditional is implicative, the denying one is concessive, and vice versa. Here I argue that, in natural language pragmatics, ‘If $A$, $\sim B$’ entails ‘$\sim$(if $A, B$)’, but ‘$\sim$(if $A, B$)’ does not entail ‘If $A$, $\sim B$’. ‘If $A, B$’ and ‘If $A$, $\sim B$’ deny each other, but are contraries, not contradictories. Truth conditions that are relevant in human reasoning and discourse often depend not only on semantic but also on pragmatic factors. Examples are provided showing that sentences having the forms ‘$\sim$(if $A, B$)’ and ‘If $A$, $\sim B$’ may have diﬀerent pragmatic truth conditions. The principle of Conditional Excluded Middle, therefore, does not apply to natural language use of conditionals. Three squares of opposition provide a representation the aforementioned relations.
Questions to Michael Dunn
Authors: Wansing Heinrich , Olkhovikov Grigory , Omori Hitoshi
Published: November 2021

We present nine questions related to the concept of negation and, in passing, we refer to connections with the essays in this special issue. The questions were submitted to one of the most eminent logicians who contributed to the theory of negation, Prof. (Jon) Michael Dunn, but, unfortunately, Prof. Dunn was no longer able to answer them. Michael Dunn passed away on 5 April 2021, and the present special issue of Logical Investigations is dedicated to his memory. The questions concern (i) negation-related topics that have particularly interested Michael Dunn or to which he has made important contributions, (ii) some controversial aspects of the logical analysis of the concept of negation, or (iii) simply properties of negation in which we are especially interested. Though sadly and regrettably unanswered by the distinguished scholar who intended to reply, the questions remain and might stimulate answers by other logicians and further research.
Technical Solution Improves Safety, Efficiency of Well Construction Offshore Australia
Authors: Carpenter Chris
Published: November 2021

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 202353, “Drilling-Performance and Risk-Management Optimization Offshore Australia: Improving Overall Safety and Efficiency of the Well-Construction Process,” by Chandrasekhar Kirthi Singam, Farshid Hafezi, and Clyde Rebello, Schlumberger, et al., prepared for the 2020 SPE Asia Pacific Oil and Gas Conference and Exhibition, originally scheduled to be held in Perth, Australia, 20–22 October. The paper has not been peer reviewed.

The emergence of real-time well construction performance-monitoring centers has improved the service delivery for operators across numerous offshore oil fields in Australia significantly. The complete paper details new technologies and work flows implemented for three Australian offshore wells, with the primary objective of improving drilling efficiency while managing associated risks. Additional objectives included optimizing daily operational performance, thus delivering time savings for the operator and highlighting areas of possible improvements.

Introduction

The paper describes a successful drilling campaign in a challenging field in the Timor Sea. It describes how data analysis, risk evaluation, and real-time performance monitoring can be influential in saving rig time and project success. As part of this project, a major operator in Australia decided to perform an infill drilling campaign involving three high-angle directional wells (J type) in a saturated, complex field. The campaign design stage was initiated in 2017 with a main objective of delivering the project within authority-for-expenditure (AFE) budget and with planning for all potential challenges.

Technical Overview

The technical solution (Fig. 1) was deployed using drilling-interpretation software and executed its work flows to achieve the required objectives.
Development of Corrosion Inhibitors to Mitigate Elemental Sulfur Induced Pitting Corrosion
Authors: Dickey Douglas C. , Obeyesekere Nihal U. Obeyesekere , Wylde Jonathan J.
Published: November 2021

The effects of elemental sulfur on the corrosion of mild steel is a serious problem in the oil & gas industry costing millions of dollars annually in lost production and assets.

Mitigating the corrosive effects of elemental sulfur on mild steel in the oil and gas industry is a challenge and finding a viable solution would provide a more cost effective and safer working environment and as well as be environmentally conscious. Currently, there are no highly effective products for elemental sulfur corrosion in the marketplace.

More than fifty new chemical formulations were blended and screened by rotating cylinder electrode method (RCE). These formulations were tested in the presence of 0.1% elemental sulfur in mildly sour conditions. The promising candidates were identified and tested again in the presence of elemental sulfur under the same mildly sour conditions.

The most promising candidates from the initial screening were then subjected to rotating cage autoclave (RCA) testing for extended periods of time in the presence of 0.1% and 0.15% elemental sulfur. The general corrosion rates were calculated via weight loss and the metal surfaces were examined under a high-power digital microscope for pitting and localized corrosion.

A detailed analysis of the above testing yields promising results. The results from the testing show that formulations mitigate pitting in environments containing elemental sulfur. In less harsh conditions, such as low chloride brines or low CO2 environment, formulations seem to provide excellent protection against general corrosion while mitigating pitting due to elemental sulfur. In more extreme environments such as harsh brines with elevated chloride levels, high hydrogen sulfide and CO2 levels, the formulations mitigate pitting but need further development in inhibiting general corrosion The best product currently developed inhibits corrosion and pitting in the presence of elemental sulfur in various conditions and performs well against elemental sulfur in more aggressive sour systems. We are currently improving the performance against elemental sulfur and developing chemistries to mitigate polysulfide induced corrosion in sour systems.

This paper describes the development of effective inhibitors for corrosion and pitting in the presence of elemental sulfur under sour conditions. This study focuses more on pitting corrosion due to the corrosive characteristics of elemental sulfur than on uniform general corrosion. The general corrosion with the selected inhibitor was highly mitigated and was less than 3.0 mpy while yielding excellent protection against sulfur induced pitting.
Turbulence Leads to Overestimation of the Acid-Diffusion Coefficient at Typical Experimental Conditions Using the Rotating Disk Apparatus
Authors: Ivanishin Igor , Kotb Abdelrahman , Nasr-El-Din Hisham
Published: November 2021

A rotating-disk apparatus (RDA) is used to determine the acid-diffusion coefficient. The equations to interpret RDA tests were previously derived assuming laminar flow to the disk, i.e. uniform accessibility with equal flux of the reactive species over the entire surface of the disk. Thus, the acid-diffusion coefficient is overestimated if the tests are run at transition or turbulent flow regimes. The present work validated laminar flow assumptions at typical RDA experimental conditions to optimize the acid-diffusion coefficient measurements. Disks of calcite marble with a diameter of 0.72, 1.11, and 1.46 in. were reacted in an RDA with hydrochloric acid at temperatures ranging from 73.4 to 100°F and disk rotational speeds ranging from 207 to 1,555 rpm. Transition to turbulent flow was observed at Reynolds numbers one order of magnitude lower than the universally accepted critical value of 3×105. Dissolution patterns on the disks after the experiments and the simulation results using a developed computational fluid-dynamics model confirm this conclusion.

The turbulence created cavities near the edges of the 1.46 and 1.1 in. disks starting at rotational speeds of 587 and 829 rpm, respectively. The region of turbulent flow propagated toward the center of the disks with further increase of disk rotational speed. Because of the non-uniform (higher) mass-transfer rate, the diffusion coefficient is overestimated to a value of 6.71×10−5 and 5.01×10−5 cm2/s for the 1.46 and 1.11 in. disks, respectively. For the 0.72 in. disks, no turbulent flow was observed at all disk rotational speeds tested, and the calculated value of the diffusion coefficient was 3.08×10-5 cm2/s. Commercial RDA setups are often equipped with 1.0 or 1.5 in. coreholders and are capable of maintaining a disk rotational speed of up to 2,000 rpm. Thus, care must be taken not to run the tests at transition or turbulent flow regimes, as this will result in overestimation of the acid-diffusion coefficient. Preliminary results indicate that the observed phenomena also affect the RDA analysis of organic and other less reactive acid compositions. Presented results are integral for designing the RDA tests to improve the accuracy of the acid-diffusion coefficient calculations.
Triazine Polymers for Improving Elastic Properties in Oil Well Cements
Authors: Patel Hasmukh , Johnson Kenneth , Martinez Roland
Published: November 2021

The oil well cement placed in the annulus between casings and the formations experience high stresses under downhole conditions. These frequent stresses deteriorate the mechanical properties of cement and lead to the formation of micro-cracks and fractures, which affect production and increases the cost of operation. Although several polymeric materials have been employed to improve tensile properties of the cement, these additives have also adversely affected the compressive strength of the cement. A highly stable polymeric additive, triazine-based polymers, is designed, synthesized, and compounded with the cement to improve the tensile properties of the well-cement. Triazine polymer was characterized by fourier transform infrared spectroscopy and thermogravimetric analysis. The triazine polymer was mixed with cement and the cement slurries were cured at 180 °F under 3000 psi for 3 days. The set-cement samples were subjected to mechanical testing under high temperature and high pressure to study the elastic properties of the cement. The introduction of this polymer into the cement has improved the elastic properties of the cement with minimum reduction in compressive strength. The thickening time, dynamic compressive strength development, rheology, fluid loss properties, and brazilian tensile strength of the control and cement with triazine polymers were studied to understand the effect of this newly developed polymeric additive. The molecular interaction of the triazine polymer with cement particles has shown formation of covalent linkage between the polymer and cement particle. We have observed a 15 % decrease in Young's modulus for cement compounded with 2%wt. of triazine polymer, indicating the introduction of elastic properties in wellbore cement.
Inhibiting Calcium Chloride Heavy Brines to be Used as Drilling Fluids: Hurdles Encountered in Treatment, Application, Corrosion Mitigation, Solubility, and Foaming Tendencies for Drilling Sites in Canada
Authors: Ariyaratna Thenuka M. , Obeyesekere Nihal U. , Jayaneththi Tharindu S. , Wylde Jonathan J.
Published: November 2021

A need for more economic drilling fluids has been addressed by repurposing heavy brines typically used as completion fluids. Heavy brine corrosion inhibitors have been designed for stagnant systems. Drilling fluids are subjected to both heavy agitation and aeration through recirculation systems and atmospheric exposure during the various stages of the drilling process. This paper documents the development of heavy brine corrosion inhibitors to meet these additional drilling fluid requirements.

Multiple system scenarios were presented requiring a methodical evaluation of corrosion inhibitor specifications while still maintaining performance. Due to the high density of heavy brine, traditional methods of controlling foaming were not feasible or effective. Additional product characteristics had to be modified to allow for the open mud pits where employees would be working, higher temperatures, contamination from drill cuttings, and product efficacy reduction due to absorption from solids. The product should not have any odor, should have a high flash point, and mitigate corrosion in the presence of drill cuttings, oxygen, and sour gases.

Significant laboratory development and testing were done in order to develop corrosion inhibitors for use in heavy brines based on system conditions associated with completion fluids. The application of heavy brine as a drilling fluid posed new challenges involving foam control, solubility, product stability, odor control, and efficacy when mixed with drill cuttings. The key to heavy brine corrosion inhibitor efficacy is solubility in a supersaturated system. The solvent packages developed to be utilized in such environments were highly sensitive and optimized for stagnant and sealed systems. Laboratory testing was conducted utilizing rotating cylinder electrode tests with drill cuttings added to the test fluid. Product components that were found to have strong odors or low flash points were removed or replaced. Extensive foaming evaluations of multiple components helped identify problematic chemistries. Standard defoamers failed to control foaming but the combination of a unique solvent system helped to minimize foaming. The evaluations were able to minimize foaming and yield a low odor product that was suitable for open mud pits and high temperatures without compromising product efficacy.

The methodology developed to transition heavy brine corrosion inhibitors from well completion applications to drilling fluid applications proved to be more complex than initially considered. This paper documents the philosophy of this transitioning and the hurdles that were overcome to ensure the final product met the unique system guidelines. The novel use of heavy brines as drilling fluids has created a need for novel chemistries to inhibit corrosion in a new application.
Treatment of Prodigious Reactive Shale in the Permian Basin Using High-Performance Drilling Fluid: A Successful Case Study
Authors: Alhadi Almostafa , Magzoub Musaab
Published: November 2021

In the Permian basin, Spraberry Trend is one of the formations that markedly contribute to the unconventional shale production in the U.S. lately. Unusual shale reactivity was encountered while drilling several horizontal wells, leading to wellbore instability issues. Consequently, shakers’ screens blockage increased the mud losses and drilling time, leading to an increased non-productive time (NPT). This paper addresses the challenges and causes of the formation instability issues resulted from shale interaction with the used drilling fluid and presents the timely actions taken to mitigate such problems.

During the drilling operation, several rock samples were collected at different depth intervals from the shale shaker. Rock samples were analyzed to identify the clay and minerals contents in the formations. The collected samples were first cleaned to remove the mud, dried, ground, and then characterized by an X-ray diffraction test (XRD) and microscopic imaging. After identifying the possible reasons for the wellbore instability, several timely actions were taken to mitigate this issue. These actions include: 1) increasing the emulsion stability, 2) increasing the water phase salinity (WPS), 3) decreasing the water phase volume, 4) adding wetting agent, 5) using wider screens for the shaker, and 6) controlling drilling parameters such as weight on bit and rotational speed. Afterward, wellbore stability, well control problem indicators, and drilling fluid properties, especially rheology, were closely monitored to identify any subsequent or unusual events.

The geological and mineralogy studies show that the drilled formation contains high smectite and illite clay content, up to 49%, which was believed to be the main reason for the unusual shale reactivity. Replacing the existing screens (200 API) with wider screens (160 and 140 API) showed an insignificant effect in mitigating the screens blockage. The adopted method of reducing the rate of penetration (ROP) and increasing the circulation time helped significantly alleviate the screens blockage by reducing the cuttings production and giving more time for hole cleaning. Furthermore, the optimal hole cleaning successfully increased the formation's stability. Adding a wetting agent to the drilling mud did not impact the cuttings aggregations; however, it led to a decrease in the rheological properties; thus, adding more concentration of the viscosifier was required to maintain the fluid rheology. Increasing the water phase salinity (WPS) to over 230k ppm and the emulsion stability to over 700 mV was considered the backbone of the treatment plan that significantly resolved the issue by inhibiting the clay. Eventually, the critical considerations were pointed out.
Implication of Turbulent Flow Induced by Gas Lift on Strontium Sulphate Scale Formation and Control Within Production Tubing
Authors: Fyfe Andrew , Nichols David , Jordan Myles
Published: November 2021

Sulphate scale can be predicted from thermodynamic models and over recent years better kinetics data has improved the prediction for field conditions. However, these models have not been able to predict the observed deposits where flow disruptions occur such as chokes, gas lift and safety valves. In recent years it has been recognised that the turbulence found at these locations increases the likelihood of scale formation and experiments have been able to demonstrate that with increased turbulence there is an increase in the mass of scale observed and an increased concentration of scale inhibitor is required to prevent its formation.

In this paper a field case is investigated where strontium sulphate was observed in a location downstream of a gas lift valve. Laboratory tests were conducted to confirm whether the expected scaling was observed in a low shear flow loop and also to investigate whether the location of the scale changed when additional turbulence (gas injection) was introduced to the system. The flowrate was chosen so that the shear stress generated on the test piece was approximately 1-2 Pa, similar to the value expected in typical field pipe flow. At the end of the test, the scale adhered to each of the five sections of the test piece pipe work was analysed separately to give data on both the mass and location of scale. A second test was also carried out to investigate the effect shear and turbulence induced by gas lift had on scale formation by modifying the test piece to introduce a flow of gas into the system. The test method was then used to evaluate a scale inhibitor and assess whether its performance was affected by the different flow regimes.

The introduction of the ‘gas lift’ had a significant effect on the location of scale. Instead of being spread evenly throughout the test piece, the majority of the scale deposited upstream of the gas injection point. This is likely due to the induced turbulence and expansion in the tubing diameter at the T-piece increasing the residence time and thereby enhancing scale growth. A significant difference in scale location was also observed when the inhibitor dose was too low to prevent deposition and a higher dose was required to achieve complete inhibition in the ‘gas lift’ system.

The findings from this study have significant impact on the design of test methods of evaluating scale risk in low saturation ratio brines and the screening methods for scale inhibitor for field application that should be utilised to develop suitable chemicals that perform better under higher shear conditions.