The challenge of estimating recovery from naturally. Type 2 vs type 1 tectonic fractured reservoirs cenozoic asmari fields, zagros dual porosity reservoirs type 2 hydrocarbon storage capacity is given by micro and vuggy matrix porosity systems, whilst deliverability is provided by networks of fissures. Controls on recovery factor in fractured reservoirs. This thesis presents an important step towards a deeper understanding of naturally fractured carbonate reservoirs nfcrs. Geomechanics, fluid dynamics and well testing, applied to. An alternative analytical solution to the system of equations for fluid flow through a doubleporosity medium with a boundary condition of an equipotential surface is given in this paper. Well production heterogeneity is a characteristic of most naturally fractured reservoirs. Moe and thomas bogno department of physics, university of bergen, norway abstract visualization of the effects of various wettability conditions on oil recovery in fractured reservoirs is demonstrated in twodimensional insitu imaging experiments in large blocks of. Characterization and modeling of naturally fractured tensleep reservoirs j a n u a ry 1 8, 2 0 11, d e n v e r shaochang wo, peigui yin, scott cooper, john lorenz. The solutions for the dimensionless flowrate and pressure are based on a model presented by warren and root. This webpage version is the ed intellectual property of the author. In this work pressure transient analysis for constant rate production and transient rate analysis for constant pressure production are presented for a naturally fractured reservoir. Get pdf abstract an idealized model has been developed for the purpose of studying the characteristic behavior of a permeable medium which contains regions which contribute significantly to the pore volume of the system hut contribute negligibly to the flow.
Prediction of naturally fractured reservoir performance. Poster presented at the modeling and benchmarking of fractured porous media. Hydraulic fracturing of naturally fractured reservoirs. Field examples and case studies demonstrate the importance of integrated geologic and. Numerical simulation of wateroil flow in naturally. The purpose of this collection of 15 papers is to introduce the subject of naturally fractured reservoir characterization to engineers interested in gaining a basic overview of the technology and its. Well test analysis in naturally fractured reservoirs using elliptical flow start download portable document format pdf and ebooks electronic books free online rating news 20162017 is books that can provide inspiration, insight, knowledge to the reader. The solution is straightforward, and involves only ordinary bessel functions. Introduction normally, production from an oil reservoir is started with the help of the stored energy in the reservoir, and after a while, depending on reservoir conditions, this. E n h a n c e d o i l r e c o v e r y i n s t i t u t e a brief overview of the tensleep reservoirs in. Introduction the development of reservoir modeling and reservoir characterization for naturally fractured reservoirs nfrs has lagged behind simpler matrix flow dominated rock. These results show the significance of imbibition in recovering oil from the reservoir rock in reservoirs with an interconnected fracture network. Naturally fractured reservoirs present many challenges.
Characterization of naturally fractured reservoirs digital. In this model, the fluid flows through the fracture system in the reservoir, while matrix blocks are segregated by the fractures and act as the fluids sources for them. Pages 69 79 exploring overpressured, naturally fractured reservoirs, powder river basin, wyoming. Multiphase fluid flow in porous and fractured reservoirs discusses the process of modeling fluid flow in petroleum and natural gas reservoirs, a practice that has become increasingly complex thanks to multiple fractures in horizontal drilling and the discovery of more unconventional reservoirs and resources the book updates the reservoir engineer of today with the latest developments in. Geologic analysis of naturally fractured reservoirs.
Eclipse simulation of naturally fractured reservoirs this course is designed for reservoir engineers involved in the evaluation and management of naturally fractured reservoirs nfrs. Recently, vuggy fractured rock characterization has received attention, because a number of fractured vuggy reservoirs have been found worldwide that can significantly contribute to oil and gas reserves and product 6 7. The original idealized model assumes that the fracture is the primary conduit for flow, whereas the matrix acts. The simulator is a threedimensional, threephase black oil simulator developed to describe fluid flow in a naturally fractured reservoir based on the boast formulation. Characterization of naturally fractured reservoirs. The purpose of this collection of 15 papers is to introduce the subject of naturally fractured reservoir characterization to engineers interested in gaining a basic overview of the technology and its applications. In particular, it is intended for reservoir engineers who perform activities related to understanding nfr behavior and who use numerical simulation models for. Naturally fractured reservoirs training course petroskills fr. A simulation approach for screening of eor scenarios in. Pdf characterization of naturally fractured reservoirs. This article is based on crains analyzing fractured reservoirs by e. Castagna1 1university of houston 2schlumberger and 3delta geophysics received march 2012, revision accepted september 2012 abstract. Well test analysis of naturally fractured vuggy reservoirs with an analytical triple porosity double permeability model and a global. Naturally fractured reservoirs present a production paradox.
This book addresses some of the challenges and advances in knowledge, approaches, concepts, and methods used to characterize the interplay of rock matrix and. Because of the presence of two distinct types of porous media, the assumption of homogeneous behavior is no longer valid in naturally fractured reservoirs. Most of these hydrocarbon volumes have been left behind because of the poor. The behavior of naturally fractured reservoirs onepetro. Textbook series natural fractured reservoir engineering. Discretization and gridding in reservoir simulation 2. Castagna1 1university of houston 2schlumberger and 3delta geophysics received march 2012, revision accepted september 2012. Naturally fractured reservoirs have been classified according to the relative contribution of the matrix and fractures to the total fluid production. Pdf reservoir characterization for naturally fractured reservoirs. The pressure buiidup performance has been examined insomedetait. Characterization of natural vuggy fractured porous medium.
Prediction of naturally fractured reservoir performance using. Oil recovery in fractured reservoirs arne graue, robert w. Development of reservoir characterization techniques and. The identification of natural fractures in inclined highly. Naturally fractured reservoir characterization seeks to confront many of these challenges by providing an introduction to the engineering and geological character of naturally fractured reservoirs. Geologic analysis of naturally fractured reservoirs 2nd. Applications and limitations of geologic and engineering procedures and tools are discussed. Crains petrophysical handbook fractured reservoir basics. The behavior of naturally fractured reservoirs joi%warren p, j, rqot members aime abstract an idealized model has been developed for the purpose of studying the characteristic behavioroja permeable medium which contains regions which contribute sigizificantly to tbe pore volume o. Geologic analysis of naturally fractured reservoirs kindle edition by nelson, ronald. This course covers geologic and engineering concepts, methodology, and technology used to characterize, evaluate, and manage naturally fractured reservoirs.
Well test analysis of naturally fractured vuggy reservoirs. On the other hand, they represent some of the largest, most productive reservoirs on earth. Layered reservoirs with interlayer crossflow may also exhibit similar behavior. Numerical results show that d, the ratio of matrix system permeability to. Yushu wu, in multiphase fluid flow in porous and fractured reservoirs, 2016. Seismic characterization of naturally fractured reservoirs using amplitude versus offset and azimuth analysis mehdi e. Most of these reservoirs have carbonate rock type which is naturally fractured. Pdf use of fractured reservoir simulators can help reservoir engineers in the understanding of the main physical mechanisms and in the choice of the.
For these reservoir characteristics it is difficult to place a reasonable certainty of volumetric estimates of original hydrocarbonsinplace and reserves. Geologic and engineering aspects of naturally fractured. The uncertainties related to the size of the physical structure and the reservoir fluid content, make understanding fluid flow unpredictable. In the past halfcentury, the study of fluid flow and transport processes in fractured porous media has received great attention and has. Dual porosity reservoirs are characterized by the presence of two media, matrix and fractures. The focus is on understanding fractures in a reservoir how to. Modifications to a generalized naturally fractured reservoir simulator developed by ohen and evans 1990 serve as the basis for the naturally fractured reservoir simulator. It is well known that the natural reactivation potential and the susceptibility of fractured reservoirs to hydraulic stimulation is influenced by the lithology meixner et al. Content distributed via the university of minnesotas digital conservancy may be subject to additional license and use restrictions applied by the depositor. Well test analysis for naturallyfractured reservoirs unt.
Production data analysis of naturally fractured reservoir. Geologic analysis of naturally fractured reservoirs ronald. This model was originally developed for liquid in naturally fractured systems. Spe 84590 presented at the spe technical conference and exhibition held in colorado, 5 to 8 october. Flow tests in naturally fractured reservoirs have been analysed using a con tinuum approach to model the reservoir, i.
It demonstrates the various kinds of discontinuities using geological evidence, mathematical kinematics model and computed tomography and uses this as a basis for proposing a new classification for nfcrs. Geologic analysis of naturally fractured reservoirs ronald nelson geologists, engineers, and petrophysicists concerned with hydrocarbon production from naturally fractured reservoirs will find this book a valuable tool for obtaining pertinent rock data to. Multiscale modeling of carbon dioxide migration and. The use of the dualporosity approach for the modeling of naturally fractured reservoirs has become widely accepted in the oil industry. This paper presents a technique for the identification and characterization of naturally fractured reservoirs using conventional well logs. Overview of naturally permeable fractured reservoirs in. This is an important step in developing exploitation strategies for optimizing the recovery from naturally fractured reservoir systems. Reservoir characterization and simulation modeling of naturally fractured reservoirs nfrs presents unique challenges that differentiate it from conventional.
The challenge of estimating recovery from naturally fractured. Naturally fractured reservoir, enhanced oil recovery, compositional simulation, reservoir fluid model, wateralternatinggas injection 1. The behavior of naturally fractured reservoirs onepetro dois. Characterization of naturally fractured reservoirs article pdf available in spe reprint series spe 69538 march 2001 with 1,474 reads how we measure reads. The next logical extension of this work is to apply the proposed. This article discusses two naturally fractured reservoir models, the physics governing fluid flow in these reservoirs and semilog and type curve analysis techniques for well tests in these. Multiscale modeling of carbon dioxide migration and trapping in fractured reservoirs. Characterization and modeling of naturally fractured. Abstract an idealized model has been developed for the purpose of studying the. The problem is reduced to solving an integral equation. Seismic characterization of naturally fractured reservoirs.
Naturally fractured reservoir an overview sciencedirect topics. The simulator was used on the conceptual models of two naturally fractured reservoirs. The behavior of naturally fractured reservoirs joi%warren p, j, rqot members aime abstract. The behavior of naturally fractured reservoirs including. Recognizing naturally fractured reservoirs petrowiki.
Multiphase fluid flow in porous and fractured reservoirs. Get pdf abstract an idealized model has been developed for the purpose of studying the characteristic behavior of a permeable medium which contains regions which contribute significantly to the pore volume of the system hut contribute negligibly to the flow capacity. Ebook well test analysis in naturally fractured reservoirs. Manual typecurve analysis for well in naturally fractured reservoirs is tedious, and the interpretation involved is difficult. Calculate porosity partitioning coefficient of a naturally fractured reservoir calculate storage capacity and interporosity flow factor analyze well tests in naturally fractured reservoirs assess reservoir performance of horizontal wells in nfr use mbe to analyze impact of pressure depletion on recovery dr. This course covers geologic and engineering concepts, methodology, and technology used to characterize, evaluate, and manage naturallyfractured reservoirs. Logs are the most readily available source of information, however they are seldomly used in a systematic manner for. Pdf the nature of naturally fractured reservoirs researchgate. If you do not see its contents the file may be temporarily unavailable at the journal website or you do not have a pdf plugin installed and enabled in your browser. Reservoir characterization for naturally fractured reservoirs. Natural fractured reservoir engineering phdg textbooks in preparation, intended to be issued during 2015. It is important to establish some basic criteria for recognizing when fractures are an important element in reservoir performance and to recognize the nature and performance characteristics of a naturally fractured reservoir.
Purchase geologic analysis of naturally fractured reservoirs 2nd edition. Naturally fractured reservoirs exist throughout the world and represent significant amounts of oil and gas reserves, water, and other natural resources on earth. Naturally fractured reservoirs present unique and specialized challenges to hydrocarbon extraction. The applied study of naturally fractured reservoirs seeks to constrain this uncertainty by developing new understanding, and is necessarily a broad, integrated, interdisciplinary topic. Spe member price usd 45 naturally fractured reservoirs present unique and specialized challenges to hydrocarbon extraction. Do not copy or distribute in any form without explicit permission. Download it once and read it on your kindle device, pc, phones or tablets. Although both the presence of fractures and the presence of a reservoir can be determined from logs, a production test will be needed to determine whether economic production. Geologic analysis of naturally fractured reservoirs ronald nelson geologists, engineers, and petrophysicists concerned with hydrocarbon production from naturally fractured reservoirs will find this book a valuable tool for obtaining pertinent rock data to evaluate reserves and optimize well location and performance. Naturally fractured reservoirs are elusive systems to characterize and difficult to engineer and predict. Bunger csiro earth science and resource engineering ian wark laboratory melbourne, victoria, 3168, australia, rob. Well test analysis for naturallyfractured reservoirs.
Use features like bookmarks, note taking and highlighting while reading geologic analysis of naturally fractured reservoirs. Kogan page ltd, 120 pentonville road, london n1 9jn. The double porosity model for single phase flow in. Most naturally fractured reservoirs i am familiar with are characterized by low matrix porosities less than 10% and low matrix permeabilities less than 1 md. Constant producing pressure solutions, which define declining production rates with time, are presented. These results show the significance of imbibition in recovering oil from the reservoir rock in. Simulation of naturally fractured reservoirs discipline reservoir engineering level advanced duration 5 days delivery mechanism classroom prerequisites completion of the applied reservoir simulation and the eclipse 100 software course is required. They are also notorious for early gas or water breakthrough. Fluid flow in naturally fractured reservoirs petrowiki. The matrix occupies most of the volume of the reservoir has very low permeability has moderate to high porosity. Numerical simulation of wateroil flow in naturally fractured. The solutions for the dimensionless flowrate and pressure are based on a model presented by warren and. They include reservoirs with low hydrocarbon recovery.
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