1,720,956 research outputs found
Development of novel techniques of model preconditioning, simulator enhancements and well placement automation to accelerate the timeline of integrated reservoir studies
Get PDFThis research developed a novel approach to pre-condition historical datum pressure and
internal reservoir architecture into geological models. A pattern recognition algorithm was
developed to conduct pressure cluster differentiation for deriving the reservoir’s heterogeneity
map which was subsequently used to condition the spatial property field distribution. The
internal architecture was derived from Routine Core Analysis (RCA) permeability data using
a fixed interval average algorithm, and used to condition the vertical property distribution. The
result was a pre-conditioned reservoir model, which honours both the pressure-derived
heterogeneity map and the RCA-derived internal reservoir architecture. The resulting pre-conditioned model required limited history-matching as it already matched the historical
pressure data within an acceptable misfit tolerance, thereby saving considerable time by
eliminating the need for time consuming history-matching.
A novel methodology was also developed to derive Saturation Height Function (SHF) and
Petrophysical Rock-Type (PRT) from RCA and log data in the absence of Mercury Injection
Capillary Pressure (MICP) data, using k-means clustering. The results were similar to SHF and
PRT from MICP-based Winland’s approach. When dealing with a secondary reservoir having
little or no MICP data, the developed methodology enables a reservoir study to advance rather
than wait on the acquisition of expensive MICP experimental results.
A novel well placement automation process and algorithm were developed, for rapid placement
of infill and sidetrack wells in simulation runtime, thereby eliminating the longer time required
by traditional manual processes.
More representative numerical modelling of equivalent dual-media pressure, wellbore pressure
of shut-in wells, productivity index and frontal advance of water-oil immiscible displacement
were developed. Seven USPTO patents were filed on the novel methodologies developed in
this research, of which four have been granted.
For the purpose of confidentiality, the developed algorithms are not disclosed in this document,
but a process workflow of the algorithms are clearly presented
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
History-Matching of Historical Pressures from Naturally Fractured Reservoirs
No full textSummary In this study, we developed the equation for calculating equivalent dual-media pressure for comparison to historical pressure from Naturally Fractured Reservoirs (NFR) during history-matching. Dual-Porosity Dual-Permeability (DPDP) approach is the most popular approach used for modeling NFRs, however, commercial DPDP simulators calculate individual rather than the equivalent dual-media pressure, leading to uncertainties during history-matching. Using the DPDP representation of NFRs, the compressibility equation was used to derive a mathematical model for deriving the equivalent dual-media pressure from the simulated matrix and fracture pressures. By applying the compressibility equation to each media, we obtained an expression containing both equivalent dual-media compressibility and pressure-change. Using the known dual-media pressure at the start of a time-step and the pressure-change during the time-step, we obtained the dual-media pressure at the end of the time-step. The resulting mathematical model is a storativity-weighted function of the simulated matrix and fracture pressures. A synthetic dataset shows the relationship between the simulated individual media, and the derived dual-media pressures, under different scenarios. In reservoirs with low matrix permeability, and high fracture-to-matrix porosity and permeability ratios, large uncertainties may arise when the simulated matrix pressures are compared to historical pressure data. In an application example, using dual-media pressure instead of the simulated matrix pressure resulted in better history-matching of pressure prior to model's property modifications. The history-matching of pressure is a non-unique process, this study provides a new degree of freedom that can be explored during such a process in NFRs. Prior to modifying model properties to obtain a history-match, the dual-media pressure rather than the individual matrix pressure should be the basis of comparison to observed pressure data. This study is the first to demonstrate the uncertainty associated with using simulated matrix pressure to history-match historical pressure in NFR. The findings could be incorporated into commercial simulators to improve the history-matching process, and ensure that model property modifications are not used as compensation for the mis-match between incomparable elements. Statements and Declarations The authors have no financial interests, ethical considerations or competing interests to declare relating to the contents of this work
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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