Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Improvements In Phase Behavior Modeling For Compositional Simulation full books in PDF, epub, and Kindle. Read online Improvements In Phase Behavior Modeling For Compositional Simulation ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : Mohsen Rezaveisi
Publisher :
ISBN 13 :
Total Pages : 690 pages
Book Rating : 4.:/5 (91 download)
Download or read book Improvements in Phase Behavior Modeling for Compositional Simulation written by Mohsen Rezaveisi and published by . This book was released on 2015 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yinghui Li
Publisher :
ISBN 13 :
Total Pages : 203 pages
Book Rating : 4.:/5 (833 download)
Download or read book Fast and Robust Phase Behavior Modeling for Compositional Reservoir Simulation written by Yinghui Li and published by . This book was released on 2007 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: A significant percentage of computational time in compositional simulations is spent performing flash calculations to determine the equilibrium compositions of hydrocarbon phases in situ. Flash calculations must be done at each time step for each grid block; thus billions of such calculations are possible. It would be very important to reduce the computational time of flash calculations significantly so that more grid blocks or components may be used. In this dissertation, three different methods are developed that yield fast, robust and accurate phase behavior calculations useful for compositional simulation and other applications. The first approach is to express the mixing rule in equations-of-state (EOS) so that a flash calculation is at most a function of six variables, often referred to as reduced parameters, regardless of the number of pseudocomponents. This is done without sacrificing accuracy and with improved robustness compared with the conventional method. This approach is extended for flash calculations with three or more phases. The reduced method is also derived for use in stability analysis, yielding significant speedup. The second approach improves flash calculations when K-values are assumed constant. We developed a new continuous objective function with improved linearity and specified a small window in which the equilibrium compositions must lie. The calculation speed and robustness of the constant K-value flash are significantly improved. This new approach replaces the Rachford-Rice procedure that is embedded in the conventional flash calculations. In the last approach, a limited compositional model for ternary systems is developed using a novel transformation method. In this method, all tie lines in ternary systems are first transformed to a new compositional space where all tie lines are made parallel. The binodal curves in the transformed space are regressed with any accurate function. Equilibrium phase behavior calculations are then done in this transformed space non-iteratively. The compositions in the transformed space are translated back to the actual compositional space. The new method is very fast and robust because no iteration is required and thus always converges even at the critical point because it is a direct method. The implementation of some of these approaches into compositional simulators, for example UTCOMP or GPAS, shows that they are faster than conventional flash calculations, without sacrificing simulation accuracy. For example, the implementation of the transformation method into UTCOMP shows that the new method is more than ten times faster than conventional flash calculations.
Author : Douglas Roger Perschke
Publisher :
ISBN 13 :
Total Pages : 912 pages
Book Rating : 4.:/5 (212 download)
Download or read book Equation of state phase behavior modeling for compositional simulation written by Douglas Roger Perschke and published by . This book was released on 1988 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ruixiao Sun
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (122 download)
Download or read book Physics and Deep Learning Based Methods for Compositional Reservoir Simulation written by Ruixiao Sun and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas injection processes for enhanced oil recovery are modeled using numerical compositional simulation. These complex displacement processes entail the mass transfer of large numbers of components among multiple fluid phases. The phase behavior is described using thermodynamic equilibrium constraints. The solution of these constraints yields the phase state and the composition of the different fluid phases that share the pore space. The accuracy and efficiency of the phase behavior computations are essential for using compositional simulation for problems of practical interest. We extend our in-house research simulator (AD-GPRS) to model general three-phase fluid mixtures. Therefore, this simulator can describe the three-phase gas injection process with water existence. In the three-phase compositional simulation, every component is allowed to exist and transfer among hydrocarbon and aqueous phases. We validate the compositional simulation by comparison with a commercial simulator's results and refinement studies. We demonstrate the robust performance of the three-phase compositional simulator by extensive test cases. Thermodynamic calculations require extensive computations, which will be significantly increased as more components involved in the reservoir fluids. Therefore, the acceleration of compositional simulation is crucial to explore after the robustness is preserved. We develop two deep-learning based models for stability analysis and flash calculation separately, to reduce the cost of thermodynamic calculations. We systematically present the process of data generation, training, and model optimization, which unravels some of the mysteries surrounding the theory and application of data-driven methods in reservoir simulation. Then the robustness and accuracy of two deep-learning-based models are verified by various case tests. Besides, incorrectly labeled phases could cause phase oscillations during simulation, further leading to the failure in numerical convergence. The main challenge for currently published methods is to keep a balance between computational costs and correctness in compositional simulation. Here, we propose a mixed methodology based on deep-learning techniques and straightforward geometrical principles. We use several case studies to show that this method can ensure accuracy and efficiency at the same time. What is more, we pioneer the application of deep-learning-based techniques in compositional simulations to accelerate computational speed. Notably, we present a strategy to batch mixtures together as one whole input vector for a deep-learning-based model, referred to as the vectorization. This technique allows the phase module to determine phase behaviors for abundant grid cells simultaneously, eliminating the iteration process in traditional compositional simulation. Improvements in computational speed are examined by a series of challenging cases on immiscible and miscible displacements. With in-depth analyses of performances, we demonstrate the robustness and strength of deep-learning-based techniques in accelerating compositional simulation computations.
Author : Ruud Weijermars
Publisher : MDPI
ISBN 13 : 3039218921
Total Pages : 238 pages
Book Rating : 4.0/5 (392 download)
Download or read book Improved Reservoir Models and Production Forecasting Techniques for Multi-Stage Fractured Hydrocarbon Wells written by Ruud Weijermars and published by MDPI. This book was released on 2019-12-12 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: The massive increase in energy demand and the related rapid development of unconventional reservoirs has opened up exciting new energy supply opportunities along with new, seemingly intractable engineering and research challenges. The energy industry has primarily depended on a heuristic approach—rather than a systematic approach—to optimize and tackle the various challenges when developing new and improving the performance of existing unconventional reservoirs. Industry needs accurate estimations of well production performance and of the cumulative estimated ultimate reserves, accounting for uncertainty. This Special Issue presents 10 original and high-quality research articles related to the modeling of unconventional reservoirs, which showcase advanced methods for fractured reservoir simulation, and improved production forecasting techniques.
Author : Chengwu Yuan
Publisher :
ISBN 13 :
Total Pages : 612 pages
Book Rating : 4.:/5 (71 download)
Download or read book A New Relative Permeability Model for Compositional Simulation of Two and Three Phase Flow written by Chengwu Yuan and published by . This book was released on 2010 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical treatments using solvents and surfactants can be used to increase the productivity of gas-condensate wells with condensate banks. CMG's compositional simulator GEM was used to simulate such treatments to gain a better understanding of design questions such as how much treatment solution to inject and to predict the benefits of such treatments. GEM was used to simulate treatments in vertical wells with and without hydraulic fractures and also horizontal wells. However, like other commercial compositional simulators, the flash calculations used to predict the phase behavior is limited to two phases whereas a three-phase flash is needed to accurately model the complex phase behavior that occurs during and after the injection of treatment solutions. UTCOMP is a compositional simulator with three-phase flash routine and attempts were made to use it to simulate such well treatments. However, this is a very difficult problem to simulate and all previous attempts failed because of numerical problems caused by inconsistent phase labeling (so called phase flipping) and the discontinuities this causes in the relative permeability values. In this research, a new relative permeability model based on molar Gibbs free energy was developed, implemented in a compositional simulator and applied to several difficult three-phase flash problems. A new way of modeling the residual saturations was needed to ensure a continuous variation of the residual saturations from the three-phase region to the two-phase region or back and was included in the new model. The new relative permeability model was implemented in the compositional reservoir simulator UTCOMP. This new relative permeability model makes it is unnecessary to identify and track the phases. This method automatically avoids the previous phase flipping problems and thus is physically accurate as well as computationally faster due to the improved numerical performance. The new code was tested by running several difficult simulation problems including a CO2 flood with three-hydrocarbon phases and a water phase. A new framework for doing flash calculations was also developed and implemented in UTCOMP to account for the multiple roots of the cubic equation-of-state to ensure a global minimum in the Gibbs free energy by doing an exhaustive search for the minimum value for one, two and three phases. The purpose was to determine if the standard method using a Gibbs stability test followed by a flash calculation was in fact resulting in the true minimum in the Gibbs free energy. Test problems were run and the results of the standard algorithm and the exhaustive search algorithm compared. The updated UTCOMP simulator was used to understand the flow back of solvents injected in gas condensate wells as part of chemical treatments. The flow back of the solvents, a short-term process, affects how well the treatment works and has been an important design and performance question for years that could not be simulated correctly until now due to the limitations of both commercial simulators and UTCOMP. Different solvents and chase gases were simulated to gain insight into how to improve the design of the chemical treatments under different conditions.
Author : Rustem Zaydullin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (91 download)
Download or read book Compositional Space Parameterization Methods for Thermal-compositional Simulation written by Rustem Zaydullin and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Compositional simulation is necessary for the modeling of complex Enhanced Oil Recovery processes (EOR), such as gas and steam injection. Accurate simulation of these EOR processes involves coupling the nonlinear conservation laws for multicomponent, multiphase flow and transport with the equations that describes the phase behavior of the mixture at thermodynamic equilibrium. Phase-behavior modeling requires extensive computations and consumes significant time. The computational cost associated with the phase-behavior calculations increases significantly for systems where three or more fluid phases coexist at equilibrium. We present a family of methods for the computation of the thermodynamic phase-behavior associated with multicomponent, multiphase flow in porous media. These methods are based on concepts developed in the analytical theory of one-dimensional gas-injection processes. For two-phase compositional simulation, we present a Compositional Space Parameterization (CSP) framework, in which the thermodynamic phase-behavior is reformulated in the tie-simplex space as a function of composition, pressure, and phase fractions. This tie-simplex space is then used to specify the base nonlinear variables for fully-implicit compositional simulation. The tie-simplex space is discretized, and multilinear interpolation of the thermodynamic relations is employed. Thus, all the thermodynamic properties become piece-wise linear functions in the tie-simplex space. The computation of the phase behavior in the course of a compositional simulation then becomes an iteration-free procedure and does not require any Equation of State (EoS) computations (flash computations or phase-stability tests). We demonstrate that the proposed CSP method reduces the computational cost of the thermodynamic calculations significantly compared with standard EoS-based approaches. Moreover, the proposed framework is promising not only for acceleration of phase-behavior computations, but more importantly as a new thermodynamically consistent approximation for general-purpose compositional simulation. Next, for the general case of multiphase (three, and more phases) simulation, we study the importance of using EoS-based modeling for thermal reservoir simulation. Here, the EoS-based approach is compared with the industry standard K-values method. The analysis employs simple one-dimensional thermal displacements of heavy oil by a mixture of steam and solvent. This analysis shows that three-phase EoS-based computations may be necessary for accurate modeling of certain types of thermal EOR processes. Finally, we develop an extension of the CSP framework for multicomponent, multiphase thermal-compositional simulation. In particular, we present a strategy for phase-state identification that can be used to bypass the need for full three-phase EoS computations. The method uses information from the parameterized extensions of the `key' tie-simplexes and is based on the adaptive discretization of the extensions of these tie-simplexes. We demonstrate the efficiency and robustness of the developed bypass strategy for the simulation of flow and transport in thermal, three-phase compositional models of heterogeneous reservoirs.
Author : Sajjad Sadeghi Neshat
Publisher :
ISBN 13 :
Total Pages : 488 pages
Book Rating : 4.:/5 (124 download)
Download or read book Phase Behavior and Compositional Simulation of Solvent EOR Processes in Unconventional Reservoirs written by Sajjad Sadeghi Neshat and published by . This book was released on 2020 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in hydraulic fracturing and horizontal drilling technologies applied to unconventional resources have enabled very large increases in oil and gas production in the United States. While the initial production rate from new wells is often high, the rate of decline during the first year of production is also very high. The ultimate hydrocarbon recovery using current technology is estimated to be between 5 to 10%, which is very low compared to conventional oil reservoirs. These challenges have increased the demand for enhanced oil recovery (EOR) in unconventional reservoirs. Unconventional reservoirs have very different properties than conventional reservoirs such as extremely low permeability, wide and complex pore size distributions, high total organic carbon (TOC), and high heterogeneity. New cost effective EOR methods consistent with these properties are needed. This research presents a new framework for phase behavior modeling and compositional simulation of solvent EOR in unconventional reservoirs (also called tight oil reservoirs). Several new physical models were developed for this purpose. The new developments include a three-phase capillary pressure model, a phase stability method for multi-component mixtures with capillary pressure, coupled three-phase flash and capillary pressure models, and a new oil characterization method for organic-rich reservoirs. These models improve petrophysical, thermodynamic, and transport modeling of unconventional reservoirs. All new models were implemented in UTCOMP, an equation-of-state compositional reservoir simulator. The simulator was used for design and optimization of solvent EOR processes in organic-rich tight oil reservoirs. The oil recovery using cyclic huff-n-puff injection of a variety of solvents such as natural gas, CO2, methanol and dimethyl ether (DME) was compared. DME has the best performance among all solvents considered in this research. At reservoir conditions, DME mixes with both water and hydrocarbon phases. This helps to remove water blockage as well as retrograde condensate in gas-condensate reservoirs. DME can also extract part of the bitumen in the rock, which does not flow by itself due to its extremely high viscosity. Since the recovery rate of DME is very high, it can be recycled and injected back into the reservoir to reduce its net cost
Author :
Publisher :
ISBN 13 :
Total Pages : 442 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-08 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ryosuke Okuno
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (852 download)
Download or read book Modeling of Multiphase Behavior for Gas Flooding Simulation written by Ryosuke Okuno and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Miscible gas flooding is a common method for enhanced oil recovery. Reliable design of miscible gas flooding requires compositional reservoir simulation that can accurately predict the fluid properties resulting from mass transfer between reservoir oil and injection gas. Drawbacks of compositional simulation are the efficiency and robustness of phase equilibrium calculations consisting of flash calculations and phase stability analysis. Simulation of multicontact miscible gas flooding involves a large number of phase equilibrium calculations in a near-critical region, where the calculations are time-consuming and difficult. Also, mixtures of reservoir oil and solvent such as CO2 and rich gas can exhibit complex phase behavior at temperatures typically below 120°F, where three hydrocarbon-phases can coexist. However, most compositional simulators do not attempt to solve for three hydrocarbon-phases because three-phase equilibrium calculations are more complicated, difficult, and time-consuming than traditional two-phase equilibrium calculations. Due to the lack of robust algorithms for three-phase equilibrium calculations, the effect of a third hydrocarbon-phase on low-temperature oil displacement is little known. We develop robust and efficient algorithms for phase equilibrium calculations for two and three phases. The algorithms are implemented in a compositional reservoir simulator. Simulation case studies show that our algorithms can significantly decrease the computational time without loss of accuracy. Speed-up of 40% is achieved for a reservoir simulation using 20 components, compared to standard algorithms. Speed-up occurs not only because of improved computational efficiency but also because of increased robustness resulting in longer time-step sizes. We demonstrate the importance of three-phase equilibrium calculations, where simulations with two-phase equilibrium approximations proposed in the literature can result in complete failure or erroneous simulation results. Using the robust phase equilibrium algorithms developed, the mechanism is investigated for high efficiency of low-temperature oil displacements by CO2 involving three hydrocarbon-phases. Results show that high displacement efficiency can be achieved when the composition path goes near the critical endpoint where the gaseous and CO2-rich liquid phases merge in the presence of the oleic phase. Complete miscibility may not be developed for three-phase flow without considering the existence of a tricritical point.
Author : Saeedeh Mohebbinia
Publisher :
ISBN 13 :
Total Pages : 424 pages
Book Rating : 4.:/5 (87 download)
Download or read book Advanced Equation of State Modeling for Compositional Simulation of Gas Floods written by Saeedeh Mohebbinia and published by . This book was released on 2013 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple hydrocarbon phases are observed during miscible gas floods. The possible phases that result from a gas flood include a vapor phase, an oleic phase, a solvent-rich phase, a solid phase, and an aqueous phase. The solid phase primarily consists of aggregated asphaltene particles. Asphaltenes can block pore throats or change the formation wettability, and thereby reduce the hydrocarbon mobility. The dissolution of injected gas into the aqueous phase can also affect the gas flooding recovery because it reduces the amount of gas available to contact oil. This is more important in CO2 flooding as the solubility of CO2 in brine is much higher than hydrocarbons. In this research, we developed efficient and fast multi-phase equilibrium calculation algorithms to model phase behavior of asphaltenes and the aqueous phase in the compositional simulation of gas floods. The PC-SAFT equation of state is implemented in the UTCOMP simulator to model asphaltene precipitation. The additional computational time of PC-SAFT is substantially decreased by improving the root finding algorithm and calculating the derivatives analytically. A deposition and wettability alteration model is then integrated with the thermodynamic model to simulate dynamics of precipitated asphaltenes. Asphaltene deposition is shown to occur with pressure depletion around the production well and/or with gas injection in the reservoir domain that is swept by injected gas. It is observed that the profile of the damaged area by asphaltene deposition depends on the reservoir fluid. A general strategy is proposed to model the phase behavior of CO2/hydrocarbon/water systems where four equilibrium phases exist. The developed four-phase reduced flash algorithm is used to investigate the effect of introducing water on the phase behavior of CO2/hydrocarbon mixtures. The results show changes in the phase splits and saturation pressures by adding water to these CO2/hydrocarbon systems. We used a reduced flash approach to reduce the additional computational time of the four-phase flash calculations,. The results show a significant speed-up in flash calculations using the reduced method. The computational advantage of the reduced method increases rapidly with the number of phases and components. We also decreased the computational time of the equilibrium calculations in UTCOMP by changing the sequential steps in the flash calculation where it checks the previous time-step results as the initial guess for the current time-step. The improved algorithm can skip a large number of flash calculation and stability analyses without loss of accuracy.
Author : Matthew Balhoff
Publisher : Elsevier
ISBN 13 : 0323992366
Total Pages : 348 pages
Book Rating : 4.3/5 (239 download)
Download or read book An Introduction to Multiphase, Multicomponent Reservoir Simulation written by Matthew Balhoff and published by Elsevier. This book was released on 2022-10-26 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Introduction to Petroleum Reservoir Simulation is aimed toward graduate students and professionals in the oil and gas industry working in reservoir simulation. It begins with a review of fluid and rock properties and derivation of basic reservoir engineering mass balance equations. Then equations and approaches for numerical reservoir simulation are introduced. The text starts with simple problems (1D, single phase flow in homogeneous reservoirs with constant rate wells) and subsequent chapters slowly add complexities (heterogeneities, nonlinearities, multi-dimensions, multiphase flow, and multicomponent flow). Partial differential equations and finite differences are then introduced but it will be shown that algebraic mass balances can also be written directly on discrete grid blocks that result in the same equations. Many completed examples and figures will be included to improve understanding. An Introduction to Petroleum Reservoir Simulation is designed for those with their first exposure to reservoir simulation, including graduate students in their first simulation course and working professionals who are using reservoir simulators and want to learn more about the basics. Presents basic equations and discretization for multiphase, multicomponent transport in subsurface media in a simple, easy-to-understand manner Features illustrations that explain basic concepts and show comparison to analytical solutions and commercial simulators Includes dozens of completed example problems on a small number of grid blocks Offers pseudocode and exercises to allow the reader to develop their own computer-based numerical simulator that can be verified against analytical solutions and commercial simulators
Author : Xiaohu Dong
Publisher : Frontiers Media SA
ISBN 13 : 2889764605
Total Pages : 102 pages
Book Rating : 4.8/5 (897 download)
Download or read book Advancements of Phase Behavior and Fluid Transport in Petroleum Reservoirs written by Xiaohu Dong and published by Frontiers Media SA. This book was released on 2022-06-30 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Karen Schou Pedersen
Publisher : CRC Press
ISBN 13 : 1040002099
Total Pages : 642 pages
Book Rating : 4.0/5 (4 download)
Download or read book Phase Behavior of Petroleum Reservoir Fluids written by Karen Schou Pedersen and published by CRC Press. This book was released on 2024-01-26 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developed in conjunction with several oil companies using experimental data for real reservoir fluids, Phase Behavior of Petroleum Reservoir Fluids introduces industry standard methods for modeling the phase behavior of petroleum reservoir fluids at different stages in the process. Keeping mathematics to a minimum, this book discusses sampling, characterization, compositional analyses, and equations of state used to simulate various pressure–volume–temperature (PVT) properties of reservoir fluids. The Third Edition has been updated throughout. Reflects advances in equation of state modeling for reservoir fluids and CO2-rich fluids Presents association models along with non-classical mixing rules for handling fluids with aqueous components Has an extended coverage of reservoir fluid communication, energy properties, and asphaltene precipitation Provides practical knowledge essential for achieving optimal design and cost-effective operations in a petroleum processing plant This book offers engineers working in the energy sector a solid understanding of the phase behavior of the various fluids present in a petroleum reservoir.
Author :
Publisher :
ISBN 13 :
Total Pages : 1416 pages
Book Rating : 4.F/5 ( download)
Download or read book Petroleum Abstracts. Literature and Patents written by and published by . This book was released on 1990 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Knut-Andreas Lie
Publisher : Cambridge University Press
ISBN 13 : 1316519961
Total Pages : 625 pages
Book Rating : 4.3/5 (165 download)
Download or read book Advanced Modelling with the MATLAB Reservoir Simulation Toolbox written by Knut-Andreas Lie and published by Cambridge University Press. This book was released on 2021-11-25 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents advanced reservoir simulation methods used in the widely-used MRST open-source software for researchers, professionals, students.
Author :
Publisher :
ISBN 13 :
Total Pages : 780 pages
Book Rating : 4.:/5 (31 download)
Download or read book Fossil Energy Update written by and published by . This book was released on 1982 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
