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Crude Distillation Process Simulation Using Unisim Design Simulator
The paper deals with the simulation of the crude distillation process using the Unisim Design simulator. The necessity of simulating this process is argued both by considerations related to the design of the crude distillation column, but also by considerations related to the design of advanced control systems. In order to use the Unisim Design simulator to simulate the crude distillation process, the identification of the simulators used in Romania and an analysis of the PRO/II, HYSYS, and Aspen HYSYS simulators were carried out. Analysis of the simulators for the crude distillation process has allowed the authors to elaborate the conclusions of the success of the crude modelling. A first aspect developed by the authors is the implementation of specific problems of petroleum liquid-vapors equilibrium using Unisim Design simulator. The second major element of the article is the development of the methodology and the elaboration of the simulation program for the crude distillation pr...
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The process of atmospheric distillation represents the first oil processing process realized in refineries, with a particular impact, both in terms of production and energy. The modeling and simulation of the atmospheric distillation process is one of the tools used to reduce operating costs and increase the efficiency of the industrial plant. The paper aims at presenting research concerning the calculation of liquid-vapor equilibrium for petroleum products as well as an exhaustive analysis of an oil distillation column modeling. The paper is an indispensable didactic component in the mathematical modeling activity of the atmospheric distillation process.
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Petroleum products play an important role in different sectors of Bangladesh and Eastern Refinery Limited is the most renowned company to refine crude oil to produce different petroleum products. It produces almost 16 different petroleum products such as LPG, Naphtha, Kerosene, Diesel, AGO, Fuel gas. Though refining process consists of a wide variety of units the major part is done in Crude Distillation Unit (CDU). So, Simulation of Crude Distillation Unit of Eastern Refinery Limited Company was carried out using ‘Aspen Plus’ Process Simulator. The aim of the simulation was to compare the theoretical data with the simulated data. Design data have been taken from Eastern Refinery Limited. Aspen Plus model was developed and simulated data was validated. Different distillation curves obtained from the simulator was found similar to the expected.
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Crude distillation unit (CDU) is a complex process in the field of separation which produces wide range of products at different stages under different conditions.The products of the process were heavy naphtha,kerosene,diesel,atmospheric gas oil and reduced crude.However,the dynamic and multivariable nature with strict quality was makes it difficult to operate the process units steadily.More,the dynamics of CDU are complex due to its complex vapor-liquid equilibrium relationships.It is necessary to predict the new steady-state values for any changes in the operating conditions.This research aims to develop a steady-state model for CDU based on the fundamental modeling approach. The simulation was carried out in Aspen Plus.The effect of feed flow rate,feed composition and steam flow rate on product compositions and tray temperatures were studied.The results were compared with the data available in the literature and the accuracy of the model has been proved.
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Steady-state and dynamic simulation play important roles in investigation of refinery units. Therefore, simulation can help this investigation and behavior assessment. In this paper, simulation was done by commercial software. In fact, because of solving many state equations simultaneously and using control theory, dynamic simulation has more significant impact than steady-state simulation. Flow, pressure, temperature and level (FPTL) were controlled by Proportional-Integral-Derivative (PID) controllers in the unit. The case study is Kermanshah Refinery. The behavior of the FPTL controllers in dynamic regime were observed after the changing of the crude oil feed flow rate by 3% for 5 h. ASTM D86 boiling points (compositions) of two simulations were compared with experimental data. Finally, system sensitivity to inputs variables was investigated in the MATLAB®/SimulinkTM by transferring the dynamic results. Transient responses to changes such as feed temperature, feed flow rates, st...
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Steady state models for a multi-component crude distillation column have been developed from the MESH equations. The equations developed are capable of predicting the concentrations (mole fractions) and temperature of any component/fraction of interest from the mixture on the trays of the column. The accuracy of the models was ascertained with plant data of the crude distillation unit of the Port-Harcourt Refinery. The models applied to this distillation column produced a set of forty eight coupled algebraic equations for any component/fraction of interest. These equations were transformed into a matrix and solve by matrix inversion using the Mathlab solver. The model results of the concentrations and temperatures for five components compared favorably with output values from the distillation unit with maximum deviations of 8.33% and 6.62% respectively. The developed model also accurately predicted the tray of withdrawal of the five components/fractions in the distillation column. The models were therefore used to simulate the effects of feed flow rate and feed tray position on the efficiency of the distillation column.
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Ivan Dario Chia Gil
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Numerical tuning in reservoir simulation: it is worth the effort in practical petroleum applications
- Technical Paper
- Published: 04 January 2019
- Volume 41 , article number 59 , ( 2019 )
Cite this article
- G. Avansi 1 ,
- V. Rios 1 &
- D. Schiozer 1
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Giant carbonate oil fields in Brazilian pre-salt area present a high level of heterogeneity. Despite the fact that geoscientists aim at modelling these complex models in a high-block cell resolution, it is important to reduce the computational effort and speed up some processes such as forecasting the production during a risk analysis in a probabilistic approach. This practice must be evaluated to keep numerical and geological consistency of reservoir models. As a result, creating a procedure to assist petroleum scientists and engineers so as to reduce computational time, without losing accuracy, is the main goal of this proposed work. A methodology based on numerical parameter evaluation, tuning technique, diagnosis and application is defined to provide a robust and effective starting point of the numerical control settings during reservoir simulation model runs. All of the analyses are based on a good understanding of the reservoir heterogeneities (geologists) and characteristics (reservoir engineering) that may result in reduced central processing unit time, number of time-step cuts, solver failures and material balance compared to the default approach considered for these problems. In addition, to check the consistency of the proposed procedure, one building risk curve application for two case studies was selected, assuming that we are executing the tuning and the application in sequence of a common reservoir application. The results of the two case applications under our proposed assumptions showed that it is possible to (1) speed the simulation runs up to three times in comparison with the base case which uses the default numerical parameters of a commercial simulator, (2) reduce the number of cuts and failures and (3) control the material balance equation error within a previously defined tolerance. Despite decreasing the simulation run time in practical reservoir study applications, we are also avoiding bad combination of numerical inputs which can result in unfeasible reservoir numerical models. To conclude, depending on the amount of applications, number of runs and complexity of reservoir numerical model, the results showed that we can save time in the reservoir engineer’s routine activities while maintaining the consistency of reservoir models by dedicating an initial time to better understand and optimise the numerical parameters. Even though the vast majority of reservoir numerical models are created in high-resolution grid cells to maintain the level of heterogeneity and, consequently, increase the computational effort, more suitable numerical model quantifications should be conducted in order to reduce the running time. Nonetheless, a consistency in the reservoir model must be maintained during the entire procedure. Thus, the most important step before starting any reservoir simulation workflow is to set the numerical parameters to avoid convergence problems, to keep the consistency of the numerical simulation results (approaching the solution of nonlinear equations to the true solution) and to assist geoengineering in starting the reservoir numerical parameters consciously. In addition, we can make sure that appropriate controls of the numerical model are then being used efficiently as a practice in reservoir simulation studies, mainly before starting to run a large amount of simulations.
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Reservoir Optimization and Simulation Modeling: A Case Study
Geological uncertainty and effects of depositional sequence on improved oil recovery processes.
Ngoc Nguyen, Cuong T. Q. Dang, … Long X. Nghiem
Geostatistical facies simulation with geometric patterns of a petroleum reservoir
Paulo Roberto Moura de Carvalho, João Felipe Coimbra Leite da Costa, … Luiz Eduardo Seabra Varella
Abbreviations
Root-mean-square
m th grid cell
Time increment
Production rate from the grid cell (m 3 /day)
Formation volume factor
Volume of the grid cell (m 3 )
Porosity of the grid cell
Bubble point pressure (kPa)
Time-step cuts
Solver convergence failures
Cumulative oil production (m 3 )
Cumulative water production (m 3 )
Cumulative gas production (m 3 )
Material balance equation
Solver iterations
Newtonian cycles
Number of time-step cuts
Central processing unit (s)
- Numerical tuning
Standard deviation
n th time-step
Fluid phase (oil, water or gas)
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Acknowledgements
This work was conducted with the support of Energi Simulation and in association with the ongoing project registered as “BG-32—Análise de Risco para o Desenvolvimento e Gerenciamento de Campos de Petróleo e Potencial uso de Emuladores” (UNICAMP/Shell Brazil/ANP) funded by Shell Brazil, under the ANP R&D levy as “Compromisso de Investimentos com Pesquisa e Desenvolvimento”. The authors also thank UNISIM, DE-FEM-UNICAMP, CEPETRO and PETROBRAS for supporting this work and CMG, Emerson and Schlumberger for software licenses. We would like to thank Samuel Ferreira de Mello (researcher at UNISIM’s Group with expertise in PVT modelling process) for modelling the fluid.
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Avansi, G., Rios, V. & Schiozer, D. Numerical tuning in reservoir simulation: it is worth the effort in practical petroleum applications. J Braz. Soc. Mech. Sci. Eng. 41 , 59 (2019). https://doi.org/10.1007/s40430-018-1559-9
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DOI : https://doi.org/10.1007/s40430-018-1559-9
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UNISIM-I-D: Case Study for Selection of Production Strategy
The case study was organized by Gaspar, A.T., Maschio, C., Santos, A.A., Avansi, G.D., Filho, J.H. and Schiozer, D.J. (2013) . The comparative study should consider deterministic and probabilistic approaches.
Gaspar, A.T.F.S., Santos, A.A.S., Avansi, G.D., Hohendorff Filho, J. C.V., Schiozer, D.J., “UNISIM-I-D: Benchmark Studies of Oil Field Development Strategy Selection”. International Journal of Modeling and Simulation for the Petroleum Industry, v.9, pp. 47-55, April 2015, Brazil.
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The Karen J. Williams Courtroom was standing room only on Thursday morning, March 28 for oral arguments heard by Chief Judge Albert Diaz, Judge A. Marvin Quattlebaum, Jr. ‘89, and Judge William B. Traxler, Jr. ‘73 of the U.S. Court of Appeals for the Fourth Circuit.
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flow sheets using UniSim Design. Learn techniques and shortcuts for efficient use of the program. The course runs over two days. The course is made up of a ... Case Studies • NGL Fractionation Plant o Distillation columns in UniSim Design • Oil Characterization o Using UniSim Design's oil environment to characterize oils • Two Stage ...
This chapter aims to provide a step-by-step guide in simulating an integrated process flowsheet using UniSim design. The concept of simulation is based on sequential modular approach and follows the onion model for flowsheet synthesis (see Chapter 1 for details). A simple example involving the production of n-octane (C8H18) is demonstrated, with detailed descriptions given in Chapter 1.
Hands-on problems are presented for showing the step-by-step solution with the UniSim design and the Excel spreadsheet. Kinetics studies of biochemical reactions are also provided. The processing of waste, biomass and biological materials with cells, enzymes, or antibodies consists the core of the biochemical reaction engineering.
Case studies with the process simulator: UNISIM Example 1 - Flash Case study 1.1 Thermodynamic Equation of State: SRK . Data: Liquid feed Flow, kmol/h 300. Temperature, K 343. Pressure, kPa 1000. Molar fractions: 1 - BENZENE 0.1082 2 - BUTANO 0.3243 . 3 - 1-BUTENE 0.1351 . 4 - 1,3-BUTADIENE 0.4324 Operative conditions
techniques to enhance existing UniSim Design models. The course is made up of a series of hands-on workshops using examples from the natural gas processing industry, although the skills learnt can be applied to any model. Each workshop is preceded by an Instructor-guided discussion and demonstration. COURSE DELIVERY OPTIONS
Industries that use Unisim are: • Upstream Oil and Gas • Midstream and LNG • Refining • Petrochemicals • Green Hydrogen and CCUS Within those industries, users and applications include: • End-user design engineers, technology licensors and engineering, procurement, and construction (EPC) use UniSim for conceptual design, feasibility analysis and capital expenditure optimization.
The second section covers process simulation using UniSim Design software which deals with the property estimation, equipment and process design, and case studies. The Excel spreadsheet is today's leading software for problem solving which enables a chemical engineer to make computations and visualizations in the easiest way.
and running dynamic simulations using UniSim Design Dynamics. The course runs over three days. The course is made up of a series of hands-on workshops using examples from the Oil and Gas industry, although the skills learnt can be applied to any model. Each workshop is preceded by an Instructor-guided discussion and demonstration.
The research is focused to optimization of crude distillation process, and the methodology used in the study is defined by the next steps: a) develop a set of simulation cases that cover the range of pump around and stripping steam ratios considered; b) for each simulation case randomly draw the crude feed composition as well as the crude feed ...
The study case, UNISIM-I-D (Avansi and Schiozer, 2015; Gaspar et al., 2015), is a synthetic model that was built based on a real dataset from the Namorado Field, Campos Basin, Brazil. UNISIM-I-D (UNISIM, 2013) is a benchmark case create for oil field development and production strategy selection. We proposed two different levels of fidelity in ...
The second section covers process simulation using UniSim Design software which deals with the property estimation, equipment and process design, and case studies. The Excel spreadsheet is today's ...
UNISIM software R460 was used for the simulation and optimization processes. The modelling, the steady state of the plant is established. Steady state energy and material balances obtained from steady state models are useful in evaluating different plant scenarios. And also analyze the case study. The results of the base and optimized cases ...
The simulation was provided by Unisim Design; its graphical interface made it possible to use the developed model for operator training or digital twin technology for the real plant. It was connected with the programming language Python, ... In a case study, parameter identification with multi-software engineering was performed to illustrate ...
UniSim Design is a powerful process simulation tool that enables process engineers to make timely decisions while meeting business objectives of designing & operating efficiency. This webinar will also walk you through a case study of how UniSim Design Suite is used for debottlenecking studies of an offshore production facility. These ramp-up ...
UNISIM-II-D: Case Study for Field Development and Management Document: UNISIM-II-D.docx. - Data: 20 June 2018 Page 3 /15 UNISIM-CEPETRO-UNICAMP 1. Introduction The aim of this document is to present a reservoir case study to be submitted to decision analysis to define an oil exploitation strategy for field development, entitled UNISIM-II-D.
The second case study, UNISIM-I-D , is a synthetic model that was built based on a real dataset from the Namorado Field, Campos Basin, Brazil. UNISIM-I-D is a benchmark case created for oil field development and production strategy selection. The numerical model has a corner-point grid with 81 × 58 × 20 grid cells (36,739 active total cells ...
The comparative study should consider deterministic and probabilistic approaches. UNISIM-I-D Update Section with updated information and questions : uiq
in UNISIM-based process simulator: case study of a gas sweetening with effects of process parameters K S Permana 1 , A A Alimin , M Ibadurrohman and B H Susanto 1
The Karen J. Williams Courtroom was standing room only on Thursday morning, March 28 for oral arguments heard by Chief Judge Albert Diaz, Judge A. Marvin Quattlebaum, Jr. '89, and Judge William B. Traxler, Jr. '73 of the U.S. Court of Appeals for the Fourth Circuit.
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The case study of this paper is based on the UNISIM-I-D synthetic reservoir model of the Namorado Oilfield, located in the Campos Basin, Brazil Avansi and Schiozer (2015). The stratigraphic grid ...
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LIBF Certificate in Financial Studies Unit 2 (FCML) April 2024 Part B Exam - 70x 'Hugo and Sarah' Case Study Questions. 70x questions (with answers provided) to support students to become familiar and/or test their understanding of the 'Hugo and Sarah' case study (CeFS Unit 2 April 2024 Exam).