CO2/brine interfacial tension and rock wettability at reservoir conditions: A critical review of previous studies and case study of black shale from Malaysian formation

2021 ◽  
Vol 196 ◽  
pp. 107673
Author(s):  
Nurudeen Yekeen ◽  
Eswaran Padmanabhan ◽  
Hesham Abdulelah ◽  
Sayed Ameenuddin Irfan ◽  
Oluwagade Adenike Okunade ◽  
...  
Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 94
Author(s):  
Asep Kurnia Permadi ◽  
Egi Adrian Pratama ◽  
Andri Luthfi Lukman Hakim ◽  
Doddy Abdassah

A factor influencing the effectiveness of CO2 injection is miscibility. Besides the miscible injection, CO2 may also contribute to oil recovery improvement by immiscible injection through modifying several properties such as oil swelling, viscosity reduction, and the lowering of interfacial tension (IFT). Moreover, CO2 immiscible injection performance is also expected to be improved by adding some solvent. However, there are a lack of studies identifying the roles of solvent in assisting CO2 injection through observing those properties simultaneously. This paper explains the effects of CO2–carbonyl and CO2–hydroxyl compounds mixture injection on those properties, and also the minimum miscibility pressure (MMP) experimentally by using VIPS (refers to viscosity, interfacial tension, pressure–volume, and swelling) apparatus, which has a capability of measuring those properties simultaneously within a closed system. Higher swelling factor, lower viscosity, IFT and MMP are observed from a CO2–propanone/acetone mixture injection. The role of propanone and ethanol is more significant in Sample A1, which has higher molecular weight (MW) of C7+ and lower composition of C1–C4, than that in the other Sample A9. The solvents accelerate the ways in which CO2 dissolves and extracts oil, especially the extraction of the heavier component left in the swelling cell.


2020 ◽  
Vol 16 (4) ◽  
pp. 343-377
Author(s):  
Adel Saadi ◽  
Ramdane Maamri ◽  
Zaidi Sahnoun

The Belief-Desire-Intention (BDI) model is a popular approach to design flexible agents. The key ingredient of BDI model, that contributed to concretize behavioral flexibility, is the inclusion of the practical reasoning. On the other hand, researchers signaled some missing flexibility’s ingredient, in BDI model, essentially the lack of learning. Therefore, an extensive research was conducted in order to extend BDI agents with learning. Although this latter body of research is important, the key contribution of BDI model, i.e., practical reasoning, did not receive a sufficient attention. For instance, for performance reasons, some of the concepts included in the BDI model are neglected by BDI architectures. Neglecting these concepts was criticized by some researchers, as the ability of the agent to reason will be limited, which eventually leads to a more or less flexible reasoning, depending on the concepts explicitly included. The current paper aims to stimulate the researchers to re-explore the concretization of practical reasoning in BDI architectures. Concretely, this paper aims to stimulate a critical review of BDI architectures regarding the flexibility, inherent from the practical reasoning, in the context of single agents, situated in an environment which is not associated with uncertainty. Based on this review, we sketch a new orientation and some suggested improvements for the design of BDI agents. Finally, a simple experiment on a specific case study is carried out to evaluate some suggested improvements, namely the contribution of the agent’s “well-informedness” in the enhancement of the behavioral flexibility.


2017 ◽  
Vol 14 (1) ◽  
pp. 33-50
Author(s):  
Paul Watt

Published in 1903 and 1904 the Weekly Critical Review was a typical ‘little magazine’: it was produced on a shoestring with a small readership, with big editorial ambition. Its uniqueness lay in its claim to be a literary tribute to the entente cordiale (and it enjoyed the imprimatur of King Edward VII), but more importantly, it was a bilingual journal, which was rare at the time even for a little magazine. The Weekly Critical Review aimed to produce high-quality criticism and employed at least a dozen high-profile English and French writers and literary critics including Rémy de Gourmont (1858–1915), Arthur Symons (1865–1945) and H.G. Wells (1866–1946). It also published articles and musical news by four leading music critics: English critics Alfred Kalisch (1863–1933), Ernest Newman (1868–1959) and John F. Runciman (1866–1916) and the American James Huneker (1857–1921).Why did these critics write for the Weekly Critical Review? What did the articles in the WCR reveal about Anglo-French relations, about the aspirations of the English and French music critics who wrote for it, and about the scholarly style of journalism it published – a style that was also characteristic of many other little magazines? And in what ways were those who wrote for it connected? As a case study, I examine the ways in which Ernest Newman’s literary and musical networks brought him into contact with the journal and examine the style of criticism he sought to promote.


2020 ◽  
Vol 9 (11) ◽  
pp. 630
Author(s):  
Cristina Henriques ◽  
Alexandre Domingues ◽  
Margarida Pereira

The concept of urban area is complex and has been discussed for many years by several authors and organisations through different perspectives and methodological approaches. For administrative and comparison purposes statistical institutions, both at the national and international levels, classify territories according to a certain degree of urbanisation defining typologies from which indicators and certain public policies are applied. The purpose of this study is to discuss the relevance and suitability of different urban typologies. Through mapping and measuring the data of official documents, the urban dimension of Mainland Portuguese territory is discussed and its usefulness concerning the allocation of resources for promoting territorial cohesion is stressed. Results show the inadequacy of these classifications to inform planning actions, decision making, and to promote territorial policies. It also provides evidence of inaccuracies that distort the reading of the territorial reality of the case study.


Sign in / Sign up

Export Citation Format

Share Document