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Analysis Of Layered Gas Reservoir Performance Using A Semi Analytical Solution For Rate And Pressure Behavior
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Book Synopsis Analysis of Layered Gas Reservoir Performance Using a Semi-analytical Solution for Rate and Pressure Behavior by : I. Nengah Suabdi
Download or read book Analysis of Layered Gas Reservoir Performance Using a Semi-analytical Solution for Rate and Pressure Behavior written by I. Nengah Suabdi and published by . This book was released on 2001 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Well Test Analysis for Multilayered Reservoirs with Formation Crossflow by : Hedong Sun
Download or read book Well Test Analysis for Multilayered Reservoirs with Formation Crossflow written by Hedong Sun and published by Gulf Professional Publishing. This book was released on 2017-03-15 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Well Test Analysis for Multilayered Reservoirs with Formation Crossflow introduces the fundamentals of well test analysis of a multilayered reservoir with formation crossflow. The effects of reservoir parameters on wellbore pressure and flow rate are examined, as is a proper method that has been established to analyze well test data that leads to better determinations on the reservoir parameters for each layer of the reservoir. Focusing on multilayer models for data analysis, this reference explains the reasons for the existence of single-phase crossflow in multilayer reservoirs, exploring methods to establish them and presenting practical applications to utilize and implement for today's more complex reservoirs. Aiding in better well testing operations and models, this book is a one-stop solution for today's reservoir and production engineer, helping them understand every layer of their reservoir. - Includes real-world examples of well testing through multilayered reservoirs, whether with crossflow or with formation crossflow - Provides strong guidance and criteria of research on reservoir dynamic performance, such as physical models and mathematical models - Includes a new unsteady crossflow model for vertical interference testing in low-permeability zones - Describes interpretation methods for different cases in multilayer reservoirs, including a new model called semipermeable walls for stratified reservoirs, drawdown test procedures and layer-by-layer test procedures that are useful for shales between layers
Book Synopsis Analytical Investigation of Unconventional Reservoir Performance During Early-transient Multi-phase Flow Conditions by : Miao Zhang
Download or read book Analytical Investigation of Unconventional Reservoir Performance During Early-transient Multi-phase Flow Conditions written by Miao Zhang and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Unconventional gas resources accounted for more than 50% of total U.S. gas production in 2012 and its contribution is expected to increase to 75% by 2040 (EIA, 2015). In these unconventional gas reservoirs, reservoir and fluid characteristics can be significantly different from those in conventional resources, rendering traditional production data analysis methods inadequate. Those effects include long-time transient periods due to ultra-low permeability, pressure-dependent permeability and exemplified large capillary pressure. Development of reliable analysis methods to successfully capture these complex effects demands the formulation of new solutions to the governing flow equations which consider these complex nonlinearities. It is the interest of this study to develop more rigorous performance models for these types of systems derived from fundamental governing flow equations. This study presents a series of novel and rigorous semi-analytical solutions to the governing partial differential equations applicable to single-phase gas and multiphase flow in unconventional reservoirs. Focusing on early-transient periods, the proposed semi-analytical method utilizes similarity theory to transform the system of nonlinear PDEs to ordinary differential form, which is later solved via shooting method coupled Runge-Kutta numerical integration. The work starts with early-transient single-phase gas flow in linear and radial flow regimes under constant pressure and rate production conditions, followed by its direct extension to multiphase flow system using the black-oil fluid formulation. The application of the proposed multiphase flow solution to actual productionhighlighting producing gas-oil-ratio predictionis also discussed. Additionally, the proposed semi-analytical solution is proven capable of solving the multiphase flow equations under fully compositional fluid formulation. In the last chapter, capillary pressure effectsa multiphase flow effect widely recognized to be significant in unconventional system due to nano-scale pore sizeis studied using the proposed semi-analytical method. Besides studying capillary pressure as an additional pressure drop on fluid flow, the effect of capillary pressure on phase behavior and properties is also analyzed. All the results in this work are validated by matching with finely-gridded commercial numerical simulator.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Semi-Analytical Analysis of the Gas and Water Forecasts from Unconventional Reservoirs by : Abdulla Saleh Alzaabi
Download or read book A Semi-Analytical Analysis of the Gas and Water Forecasts from Unconventional Reservoirs written by Abdulla Saleh Alzaabi and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Material balance is an essential reservoir engineering tool that is used to determine original hydrocarbon in place and the production performance of a reservoir. There are several types of material-balance approaches developed, each with its own application. Such approaches include integral material balance, differential material balance and flowing material balance. In this thesis, a form of differential material balance, similar to the one developed by Muskat for Solution Gas Drive Reservoirs, has been derived for unconventional gas-water reservoirs impacted by adsorption. Originally, the developed Muskat-type equation is in the pressure domain, but it can also be derived in other domains such as the time domain and the cumulative produced fluids domains. The resulting system of ordinary differential equations (ODEs) are then solved using fourth order Runge-Kutta method which is a traditional ODE solver. The system of two differential equations for the Muskat-type equation in the time domain (time as an independent variable), are formulated with pressure and water saturation as the dependent variables. These resulting ODEs are then used to forecast and analyze the production profiles of a gas-water reservoir considering adsorption. The semi-analytical model is then validated internally using finite difference and analytical rate derivative equations, and externally by benchmarking it with a numerical simulator. The significant factor that caused the disparity between the semi-analytical model proposed in this study and the numerical simulator is the time it takes to reach pseudo-steady state flow (t_pss) with lower times producing better results. At t_pss less than 0.111 days , numerical simulation is almost replaceable in forecasting rates. However, at t_pss less than 0.717 days, cumulative gas produced can be accurately forecasted. This is to be expected and a reservoir simulator is fully transient, while material balance is based on the pseudo steady-state flow regime. This study provided a unique opportunity to investigate the characteristics of the production profile such as the peak rate and the observed inflection points while also identifying the reservoir parameters that affect them. Moreover, an equation has been developed that can be used to identify and describe the peak rate. This equation makes use of the byproduct of the Muskat-type equation ((dS_w)/dP) which can be modified in terms of rock and fluid properties to aid in history matching. Furthermore, three well specifications were investigated (constant well pressure, constant drawdown, and constant water production rate) with only two of the three producing a peak rate no peak gas production rate was observed for water rate specified wells. This study also showed that material balance can be used to replace decline curve analysis under certain conditions. This is mainly due to the reduced time to pseudo-steady state (t_pss) caused by the low total compressibility (rock and water), high permeability, low water viscosity, and low drainage area. At a threshold of t_pss less than 0.178 days, an accurate late-time forecast can be attained.Since the proposed semi-analytical model provided water saturation values for different pressures, a non-iterative methodology has been developed to improve upon Kings (G. R. King, 1993) iterative integral material balance equation for unconventional reservoirs.Through this study, a number of significant observations were made. It was found that at a low rock compressibility, the change in saturation over time can be estimated using the water production profile and initial porosity and water formation volume factor. Also, the saturation of gas can be estimated using the percentage of water produced from the original water in place (OWIP), adjusted for desorption time, at an increasing accuracy as the rock compressibility is decreased. Additionally, the cause of a phenomenon known as dual peaking which occurs in field and simulation data of CBM reservoirs has been identified to be due to the transient-state production.
Book Synopsis Data Analytics in Reservoir Engineering by : Sathish Sankaran
Download or read book Data Analytics in Reservoir Engineering written by Sathish Sankaran and published by . This book was released on 2020-10-29 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data Analytics in Reservoir Engineering describes the relevance of data analytics for the oil and gas industry, with particular emphasis on reservoir engineering.
Book Synopsis Fluid Flow in Fractured Porous Media by : Yujing Jiang
Download or read book Fluid Flow in Fractured Porous Media written by Yujing Jiang and published by MDPI. This book was released on 2019-09-30 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fluid flow in fracture porous media plays a significant role in the assessment of deep underground reservoirs, such as through CO2 sequestration, enhanced oil recovery, and geothermal energy development. Many methods have been employed—from laboratory experimentation to theoretical analysis and numerical simulations—and allowed for many useful conclusions. This Special Issue aims to report on the current advances related to this topic. This collection of 58 papers represents a wide variety of topics, including on granite permeability investigation, grouting, coal mining, roadway, and concrete, to name but a few. We sincerely hope that the papers published in this Special Issue will be an invaluable resource for our readers.
Download or read book Petroleum Abstracts written by and published by . This book was released on 1997 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamentals of Gas Reservoir Engineering by : J. Hagoort
Download or read book Fundamentals of Gas Reservoir Engineering written by J. Hagoort and published by Elsevier. This book was released on 1988-06-01 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas reservoir engineering is the branch of reservoir engineering that deals exclusively with reservoirs of non-associated gas. The prime purpose of reservoir engineering is the formulation of development and production plans that will result in maximum recovery for a given set of economic, environmental and technical constraints. This is not a one-time activity but needs continual updating throughout the production life of a reservoir.The objective of this book is to bring together the fundamentals of gas reservoir engineering in a coherent and systematic manner. It is intended both for students who are new to the subject and practitioners, who may use this book as a reference and refresher. Each chapter can be read independently of the others and includes several, completely worked exercises. These exercises are an integral part of the book; they not only illustrate the theory but also show how to apply the theory to practical problems.Chapters 2, 3 and 4 are concerned with the basic physical properties of reservoirs and natural gas fluids, insofar as of relevance to gas reservoir engineering. Chapter 5 deals with the volumetric estimation of hydrocarbon fluids in-place and the recoverable hydrocarbon reserves of gas reservoirs. Chapter 6 presents the material balance method, a classic method for the analysis of reservoir performance based on the Law of Conservation of Mass. Chapters 7-10 discuss various aspects of the flow of natural gas in the reservoir and the wellbore: single phase flow in porous and permeable media; gaswell testing methods based on single-phase flow principles; the mechanics of gas flow in the wellbore; the problem of water coning, the production of water along with the gas in gas reservoirs with underlaying bottom water. Chapter 11 discusses natural depletion, the common development option for dry and wet gas reservoirs. The development of gas-condensate reservoirs by gas injection is treated in Chapter 12.Appendix A lists the commonly used units in gas reservoir engineering, along with their conversion factors. Appendix B includes some special physical and mathematical constants that are of particular interest in gas reservoir engineering. Finally, Appendix C contains the physical properties of some common natural-gas components.
Book Synopsis Advanced Production Decline Analysis and Application by : Hedong Sun
Download or read book Advanced Production Decline Analysis and Application written by Hedong Sun and published by Gulf Professional Publishing. This book was released on 2015-02-12 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, production decline-curve analysis has become the most widely used tool in the industry for oil and gas reservoir production analysis. However, most curve analysis is done by computer today, promoting a "black-box" approach to engineering and leaving engineers with little background in the fundamentals of decline analysis. Advanced Production Decline Analysis and Application starts from the basic concept of advanced production decline analysis, and thoroughly discusses several decline methods, such as Arps, Fetkovich, Blasingame, Agarwal-Gardner, NPI, transient, long linear flow, and FMB. A practical systematic introduction to each method helps the reservoir engineer understand the physical and mathematical models, solve the type curves and match up analysis, analyze the processes and examples, and reconstruct all the examples by hand, giving way to master the fundamentals behind the software. An appendix explains the nomenclature and major equations, and as an added bonus, online computer programs are available for download. - Understand the most comprehensive and current list of decline methods, including Arps, Fetkovich, Blasingame, and Agarwal-Gardner - Gain expert knowledge with principles, processes, real-world cases and field examples - Includes online downloadable computer programs on Blasingame decline type curves and normalized pseudo-pressure of gas wells
Book Synopsis Petroleum Abstracts. Literature and Patents by :
Download or read book Petroleum Abstracts. Literature and Patents written by and published by . This book was released on 1988 with total page 1656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mathematical Modeling using Differential Equations, and Network Theory by : Ioannis Dassios
Download or read book Mathematical Modeling using Differential Equations, and Network Theory written by Ioannis Dassios and published by MDPI. This book was released on 2020-06-23 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue collects the latest results on differential/difference equations, the mathematics of networks, and their applications to engineering and physical phenomena. It features nine high-quality papers that were published with original research results. The Special Issue brings together mathematicians with physicists, engineers, as well as other scientists.
Download or read book Fossil Energy Update written by and published by . This book was released on 1983 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2001 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integral Solution-based Modeling of Gas Transport in Unconventional Reservoirs by : Jonathan Sant'Anna Garcez Nobrega
Download or read book Integral Solution-based Modeling of Gas Transport in Unconventional Reservoirs written by Jonathan Sant'Anna Garcez Nobrega and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling of gas transport through porous media has received increasing attention since the onset of production from unconventional reservoirs. One direct application of analytical and/or semi-analytical solutions derived from the underlying gas diffusivity equation is production data analysis (PDA). PDA is by far one of the most important engineering practices performed during the development of any hydrocarbon reservoir. Indeed, it is crucial to achieve better well performance prediction, improve reservoir characterization and, refine previous reserves calculations. Current conventional and well-established PDA models have been developed based on simplifying assumptions regarding both physical system (reservoir/fluid properties) and production constraints (constant flow rates and bottomhole pressure) to enable tractable analytical treatment. However, such limitations have become critical when extended to unconventional formations such as shale and tight sandstone. The need for the development of robust methodologies capable of better honor the physical aspects behind fluid transport has been heightened by unconventional formations turning into the major portion of the natural gas supply in North America. This study proposes a series of integral-based solutions obtained via Green's function method (GFM). The derived solutions are able to capture the nonlinear behavior of natural gas reservoirs and overcome the so-far elusive goal of incorporating variable rate/pressure production conditions into production data analysis. Our results demonstrated that GFM has valuable features and the potential to overcome the current challenges in nonlinear gas flow modeling with applications to production data analysis of unconventional reservoirs.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1972 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rate-decline Relations for Unconventional Reservoirs and Development of Parametric Correlations for Estimation of Reservoir Properties by : Yohanes Aklilu Askabe
Download or read book Rate-decline Relations for Unconventional Reservoirs and Development of Parametric Correlations for Estimation of Reservoir Properties written by Yohanes Aklilu Askabe and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-rate analysis and time-rate-pressure analysis methods are available to estimate reserves and study flow performance of wells in unconventional gas reservoirs. However, these tools are often incorrectly used or the analysis can become difficult because of the complex nature of the reservoir system. Conventional methods (e.g., Arps' time-rate relations) are often used incorrectly to estimate reserves from such reservoirs. It was only recently that a serious study was conducted to outline the limitations of these relations and to set guidelines for their correct application. New time-rate relations, particularly the Duong and logistic growth model, were introduced to estimate reserves and forecast production from unconventional reservoirs. These new models are being used with limited understanding of their characteristics and limitations. Moreover, well performance analyses using analytical/semi-analytical solutions (time-rate-pressure) are often complicated from non-uniqueness that arises when estimating well/formation properties. In this work, we present a detailed study of the Duong model and logistic growth model to investigate the behaviors and limitations of these models when analyzing production data from unconventional reservoirs. We consider production data generated from numerical simulation cases and data obtained from unconventional gas reservoirs to study the quality of match to specific flow regimes and compare accuracy of the reserve estimates. We use the power-law exponential model (PLE), which has been shown to model transient, transition and boundary-dominated flow regimes reliably, as a benchmark to study performance of Duong and logistic growth models. Moreover, we use the "continuous EUR" approach to compare these models during reserve estimation. Finally, we develop four new time-rate relations, based on characteristics of the time-rate data on diagnostic plots. Using diagnostic plots we show that the new time-rate relations provide a quality match to the production data across all flow regimes, leading to a reliable reserve estimate. In a preliminary study, we integrated time-rate model parameters with fundamental reservoir properties (i.e., fracture conductivity (Fc) and 30 year EUR (EUR30yr)), by studying 15 numerical simulation cases to yield parametric correlations. We have demonstrated a methodology to integrate time-rate model parameters and reservoir properties. This method avoids the non-uniqueness issues often associated with model-based production data analysis. This study provides theoretical basis for further demonstration of the methodology using field cases. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148425
