scholarly journals Enhancing asphaltene precipitation modeling by cubic-PR solid model using thermodynamic correlations and averaging techniques

2019 ◽  
Vol 17 (1) ◽  
pp. 232-241 ◽  
Author(s):  
Aktham E. Shoukry ◽  
Ahmed H. El-Banbi ◽  
Helmy Sayyouh
Keyword(s):  
Thermodynamic Parameters ◽  
Weighted Average ◽  
Published Data ◽  
Solid Model ◽  
Asphaltene Precipitation ◽  
Cubic Equation ◽  
Solid Models ◽  
Precipitation Modeling ◽  
Model Precipitation ◽  
Averaging Techniques

Abstract Cubic equation-of-state solid models are one of the most widely used models to predict asphaltene precipitation behavior. Thermodynamic parameters are needed to model precipitation under different pressures and temperatures and are usually obtained through tuning with multi asphaltene onset experiments. For the purpose of enhancing the cubic Peng–Robinson solid model and reducing its dependency on asphaltene experiments, this paper tests the use of aromatics and waxes correlations to obtain these thermodynamic parameters. In addition, weighted averages between both correlations are introduced. The averaging is based on reported saturates, aromatics, resins, asphaltene (SARA) fractions, and wax content. All the methods are tested on four oil samples, with previously published data, covering precipitation and onset experiments. The proposed wax-asphaltene average showed the best match with experimental data, followed by a SARA-weighted average. This new addition enhances the model predictability and agrees with the general molecular structure of asphaltene molecules.

scholarly journals Asphaltene precipitation modeling in dead crude oils using scaling equations and non-scaling models: comparative study

2021 ◽  
Author(s):  
Syed Imran Ali ◽  
Shaine Mohammadali Lalji ◽  
Javed Haneef ◽  
Clifford Louis ◽  
Abdus Saboor ◽  
...  
Keyword(s):  
Dilution Ratio ◽  
Asphaltene Precipitation ◽  
Comparative Performance ◽  
Weight Percentage ◽  
Full Dataset ◽  
Scaling Equation ◽  
Solid Models ◽  
Scaling Models ◽  
Precipitation Modeling ◽  
Log Scaling

AbstractThis research study aims to conduct a comparative performance analysis of different scaling equations and non-scaling models used for modeling asphaltene precipitation. The experimental data used to carry out this study are taken from the published literature. Five scaling equations which include Rassamadana et al., Rassamdana and Sahimi, Hu and Gou, Ashoori et al., and log–log scaling equations were used and applied in two ways, i.e., on full dataset and partial datasets. Partial datasets are developed by splitting the full dataset in terms of Dilution ratio (R) between oil and precipitant. It was found that all scaling equations predict asphaltene weight percentage with reasonable accuracy (except Ashoori et al. scaling equation for full dataset) and their performance is further enhanced when applied on partial datasets. For the prediction of Critical dilution ratio (Rc) for different precipitants to detect asphaltene precipitation onset point, all scaling equations (except Ashoori et scaling equation when applied on partial datasets) are either unable to predict or produce results with significant error. Finally, results of scaling equations are compared with non-scaling model predictions which include PC-Saft, Flory–Huggins, and solid models. It was found that all scaling equations (except Ashoori et al. scaling equation for full dataset) either yield almost the same or improved results for asphaltene weight percentage when compared to best case (PC-Saft). However, for the prediction of Rc, Ashoori et al. scaling equation predicts more accurate results as compared to other non-scaling models.

Geometric Assistance for the Construction of Non-Polyhedral Solids From Orthographic Views

1997 ◽  
Author(s):  
Carol Hubbard ◽  
Yong Se Kim
Keyword(s):  
Computer Graphics ◽  
Solid Model ◽  
Geometric Framework ◽  
Mechanical Parts ◽  
Interactive Computer Graphics ◽  
Mechanical Part ◽  
Solid Models ◽  
Spherical Surfaces ◽  
Rapid Construction ◽  
Engineering Drawings

Abstract As the extensive use of solid models becomes widespread, it is important to have a mechanism by which existing engineering drawings can be converted into solid models. Therefore, a geometric assistant which can aid in the construction of solid models is beneficial. In this paper, we present key operations for a system called the Assistant for the Rapid Construction of Solids (ARCS), that provides this assistance given a set of two orthographic views. ARCS is based on the Visual Reasoning Tutor (VRT), a system we developed that provides users with the geometric framework to build polyhedral solids from their orthographic views. However, the geometric domain of ARCS encompasses non-polyhedral solids with cylindrical and spherical surfaces, such as those found in typical mechanical parts. We have devised the Cylindrical and Spherical Warping operations to create cylindrical and spherical surfaces, which use interactive computer graphics that guide a human user to build non-polyhedral faces of a solid. These operations are then illustrated with an example using ARCS to create the solid model of a typical mechanical part from its orthographic projections.

Destructive Modeling by Volume Decomposition and Its Applications

2003 ◽  
Author(s):  
Yoonhwan Woo ◽  
Sang Hun Lee
Keyword(s):  
Decomposition Method ◽  
Solid Model ◽  
Solid Models ◽  
Volume Decomposition ◽  
Number Of Cells ◽  
Natural Way

Adding simple volumes, which are often called primitives, is a natural way to construct complex solid models. Conversely, cell-based volume decomposition is the existing method to decompose a complex solid model into simpler volumes that are often the primitives used to create the model. One problem of this volume decomposition is that it generates a large number of cells, many of which are unnecessary for the decomposition. In this paper, a volume decomposition method that improves the performance by avoiding generating the unnecessary cells is presented. Some possible applications are also presented to attest the usefulness of this volume decomposition method.

High-Pressure Modeling of Asphaltene Precipitation during Oil Depletion Based on the Solid Model

2017 ◽  
Vol 31 (8) ◽  
pp. 7911-7918
Author(s):  
Victor B. Regueira ◽  
Renan O. Soares ◽  
Anderson D. Souza ◽  
Gloria M. N. Costa ◽  
Silvio A. B. Vieira de Melo
Keyword(s):  
High Pressure ◽  
Solid Model ◽  
Asphaltene Precipitation

Asphaltene precipitation modeling through ACE reaping of scaling equations

2014 ◽  
Vol 57 (12) ◽  
pp. 1774-1780 ◽  
Author(s):  
Amin Gholami ◽  
Siyamak Moradi ◽  
Mojtaba Asoodeh ◽  
Parisa Bagheripour ◽  
Mohsen Vaezzadeh-Asadi
Keyword(s):  
Asphaltene Precipitation ◽  
Precipitation Modeling

Internet Based Framework to Perform Automated FEA on User Customized Products

2003 ◽  
Author(s):  
Zahed Siddique ◽  
Jiju A. Ninan
Keyword(s):  
Product Family ◽  
Solid Model ◽  
Product Families ◽  
Analysis And Evaluation ◽  
The Past ◽  
Evaluation Of Performance ◽  
Internet Users ◽  
Solid Models ◽  
3D Solid ◽  
Fea Analysis

Designing family of products require analysis and evaluation of performance for the entire product family. In the past, products were mainly mass-produced hence the use of CAD/CAE was restricted to developing and analyzing individual products. Since the products offered using a platform approach include a variety of products built upon a common platform, CAD/CAE tools need to be explored further to assist in customization of products according to the customer needs. In this paper we investigate the development of a Product Family FEA (PFFEA) module that can support FEA analysis of user customized product families members. Customer specifications for family members are gathered using the internet, users are allowed to scale and change configurations of products. These specifications are then used to automatically generate 3D solid models of the product and then perform FEA to determine feasibility of the customer specified product. In this paper, development of the PFFEA module is illustrated using a family of lawn trimmer and edger. The PFFEA module uses Pro/E to generate the solid model and ANSYS as the base FEA software.

Solid Model Streaming As a Basis for a Distributed Design Environment

2000 ◽  
Author(s):  
Di Wu ◽  
Swati Bhargava ◽  
Radha Sarma
Keyword(s):  
The Internet ◽  
Solid Model ◽  
Distributed Design ◽  
Two Dimensional ◽  
Proof Of Concept ◽  
Design Environment ◽  
One Dimensional ◽  
Solid Models ◽  
Storage Complexity ◽  
And Storage

Abstract This paper proposes an algorithm for streaming manifold solid models and NURBS geometry. A neutral streaming representation consisting of a nodes graph is encoded by a one-dimensional dynamic stack. The encoded model is transmitted over the Internet, where a two-dimensional dynamic stack decodes and reconstructs the solid model. The time and storage complexity of the algorithm are investigated. An example of streaming a solid model, resulting from a proof-of-concept implementation, is demonstrated.

Applications of Non-Manifold Topology

1995 ◽  
Author(s):  
William W. Charlesworth ◽  
David C. Anderson
Keyword(s):  
Automatic Generation ◽  
Boundary Representation ◽  
Surface Topology ◽  
Solid Model ◽  
Finite Element Analyses ◽  
Topological Constraints ◽  
Tool Paths ◽  
Solid Models ◽  
New Applications ◽  
Complicated Surface

Abstract It is widely recognized that a solid model based on a non-manifold boundary representation can have a more complicated surface topology than one based on a manifold boundary representation, but non-manifold topology has other capabilities that may be more valuable to the application developer. Non-manifold topology can be put to use in existing application areas in ways that differ significantly from the techniques developed for manifold modeling and it can be put to use in new applications that have not been satisfactorily solved by manifold topology. Several applications of non-manifold topology that would be difficult or impossible to implement using a purely manifold geometric modeler are illustrated: automatic formulation of finite element analyses from solid models, automatic generation of machining tool paths for 2½-dimensional pockets, and construction of geometric models using topological constraints. These applications demonstrate how a non-manifold model partitions the entire space in which an object is embedded, preserves elements of the model that would be discarded by conventional schemes, and permits the implementation of a common merge operation. All three applications have been implemented using a two dimensional non-manifold (non-1-manifold) geometric modeler.

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