Naturally fractured reservoirs 2nd edition free ebook download as pdf file. Pdf characterization of naturally fractured reservoirs. Dec 17, 2016 fracture network connectivity and aperture or conductivity distribution are two crucial features controlling flow behavior of naturally fractured reservoirs. On the other hand, they represent some of the largest, most productive reservoirs on earth. These include quantification in reservoir descriptions, interpretive evaluation of production history or history matching, reservoir modeling to understand the scaling of various geological and engineering data. Article recovery factors and reserves in naturally fractured reservoirs. Most of these reservoirs have carbonate rock type which is naturally fractured. The behavior of naturally fractured reservoirs abstract j.
P lemonnier and b bourbiaux simulation of naturally fractured reservoirs. Carbonate naturally fractured reservoir is a multiporous system that contain microfractures, fractures, vugs, macrovugs, matrix, type of fractures network. Naturally fractured reservoir an overview sciencedirect. In naturallyfractured reservoirs, the derivative tends to show several stabilizations at different levels. Depending on the selection of the radial flow regime, different well and reservoir models may be possible.
Naturally fractured reservoirs present a production paradox. We model a twodimensional fractured reservoir in which the matrix is. In naturally fractured reservoirs, the derivative tends to show several stabilizations at different levels. Naturally fractured reservoirs training course petroskills fr. Flow diagnostics for naturally fractured reservoirs. Geologic analysis of naturally fractured reservoirs. Introduction the development of reservoir modeling and reservoir characterization for naturally fractured reservoirs nfrs has lagged behind simpler matrix flow dominated rock. The uncertainties relating to the size of the physical structure and the fluid content of the reservoir make understanding fluid flow unpredictable. Reservoir characterization for naturally fractured reservoirs. Naturally fractured reservoirs are elusive systems to characterize and difficult to engineer and predict. Such permeability is affected by the host rocks geological history and not only a function of the matrix or primary permeability but also the natural fracture and. It is expected for naturally occurring formations that the transition period of flow from fissures to matrix takes place during the radial flow regime. 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. Naturally fractured reservoir an overview sciencedirect topics.
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. Manual typecurve analysis for well in naturally fractured reservoirs is tedious, and the interpretation involved is difficult. Yushu wu, in multiphase fluid flow in porous and fractured reservoirs, 2016. Determination of fracture conductivity and porosity versus closure stress are important for characterizing naturally fractured. When properly analyzed and integrated with novel approachesthesestudiesoften revealkeyinformationto understand the architecture and geoplumbing of fractured reservoirs in the subsurface. This fiveday course covers reservoir engineering, well testing, and simulation aspects of naturally fractured reservoirs. Naturally fractured reservoirs petroleum reservoir.
For these reservoir characteristics it is difficult to place a reasonable certainty of volumetric estimates of original hydrocarbonsinplace and reserves. Most naturally fractured reservoirs i am familiar with are char acterized by low matrix porosities less than 10% and low matrix permeabilities less than 1 md. In this case, the overall flui d flow in the reservoir strongly depends. 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. Ideally, we should consider different reservoir concepts encapsulated in a large ensemble of reservoir models to quantify the impact of these and other geological uncertainties. Naturally fractured carbonate reservoirs are geological formations characterized by a heterogeneous distribution of porosity and permeability. Fractured reservoirs naturally fractured reservoirs present many challenges.
It discusses practical aspects of largescale numerical simulation of naturally fractured reservoirs nfr and highlights some experiences in forecasting performance of nfr. Van golfracht t 1982 fundamentals of fractured reservoir engineeringdevelopments in petroleum science, no. Naturally fractured reservoirs aguilera, roberto on. Field examples and case studies demonstrate the importance of integrated geologic and. 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. A major premise of the presentation is that there is value in incorporating fractures separate from the matrix.
In fractured reservoirs viscous displacement often fails. Controls on recovery factor in fractured reservoirs. Reserves estimates in naturally fractured reservoirs present a unique challenge to the reservoir engineer. Recognizing naturally fractured reservoirs petrowiki. A number of the selected manuscripts focus on outcrop analogues. Natural fractures are important conduits for oil or gas flow to producing wells. Applications and limitations of geologic and engineering procedures and tools are discussed. 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. View notes chapter 8 wta naturally fractured reservoirs. Pdf naturally fractured reservoirs present a production paradox.
Petrophysical characterization of carbonate naturally. The challenge of estimating recovery from naturally. 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. Pdf the nature of naturally fractured reservoirs researchgate. Some of the most prolific fields produce from naturally fractured vuggy reservoirs nfvrs. The effect of connectivity on flow properties is well documented. An idealized model has been developed for the purpose of studying the characteristic behavior of a permeable medium which contains. Purchase geologic analysis of naturally fractured reservoirs 2nd edition. This behavior is observed particularly in reservoir where matrix porosity is.
Textbook series natural fractured reservoir engineering. 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. Fluid flow in naturally fractured reservoirs petrowiki. For anisotropic reservoirs in general, and fractured reservoirs in particular, several philosophical changes are required to be made. In this paper, however, we focus here on the influence of fracture aperture distribution. The focus is on understanding fractures in a reservoir how to determine whether fractures are important to hydrocarbon producibility, and if so. Most of these hydrocarbon volumes have been left behind because of the poor. Gravity drainage mechanism in naturally fractured carbonate. This course covers geologic and engineering concepts, methodology, and technology used to characterize, evaluate, and manage naturallyfractured reservoirs. Natural fractures, adverse wettability and complex matrix heterogeneity are all uncertain and can all negatively impact upon recovery. A simulation approach for screening of eor scenarios in. Root members aime 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.
Pdf the use of the dualporosity approach for the modeling of naturally fractured reservoirs has become widely accepted in the oil industry. Part 2 matrixfracture transfers and typical features of numerical studies fracture cell found at the grid location under consideration. Rock properties advanced rock properties naturally fractured reservoirs. 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. Pdf use of fractured reservoir simulators can help reservoir engineers in the understanding of the main physical mechanisms and in the choice of the. The applied study of naturally fractured reservoirs seeks to constrain this uncertainty by developing new understanding, and is necessarily a broad, integrated, interdisciplinary topic. Bunger csiro earth science and resource engineering ian wark laboratory melbourne, victoria, 3168, australia, rob. Spe 84590 presented at the spe technical conference and exhibition held in colorado, 5 to 8 october.
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. This book addresses some of the challenges and advances in knowledge, approaches, concepts, and methods used to characterize the interplay of rock matrix and. Fluids are stored in the matrix, fractures and vugs. Naturally fractured reservoirs exist throughout the world and represent significant amounts of oil and gas reserves, water, and other natural resources on earth. The behavior of naturally fractured reservoirs onepetro. Pdf article recovery factors and reserves in naturally. 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. Fracture network connectivity and aperture or conductivity distribution are two crucial features controlling flow behavior of naturally fractured reservoirs. Surfactant enhanced oil recovery from naturally fractured. Reserve estimates for naturally fractured reservoirs onepetro. Schlumberger uses a unique combination of modeling and visualization techniques to simulate fracture properties.
In the past halfcentury, the study of fluid flow and transport processes in fractured porous media has received great attention and has. This course covers geologic and engineering concepts, methodology, and technology used to characterize, evaluate, and manage naturally fractured reservoirs. The challenge of estimating recovery from naturally fractured. They are also notorious for early gas or water breakthrough. Naturally fractured reservoirs have been classified according to the relative contribution of the matrix and fractures to the total fluid production. They include reservoirs with low hydrocarbon recovery. If, however, a plot of the deviation from the asymptotic solution behaves in the prescribed manner, it is safe to con clude that the reservoir can be considered to be.
State of the art part 1 physical mechanisms and simulator formulation the physics, alternative approaches in fractured reservoir simulation, simulation of specific phenomena in fractures, simulation of conductive faults and the different issues of well modeling. The more successful developments of naturally fractured reservoirs are often those that have been approached cautiously with a phased development plan. In other words, a cell is a discretized element of volume including both fracture and matrix blocks. Because they must be incorporate into the numerical model of simulation the results of the petrophysical characterization, it is conceptualized like a model of double porosity. Naturally fractured reservoirs present unique and specialized challenges to hydrocarbon extraction. This chapter presents the critical attributes that must be evaluated to quantify fractured reservoirs in a logical, workable sequence.
Pdf the behavior of naturally fractured reservoirs. Reliable production forecasting for fractured carbonate reservoirs is a challenge. Hydraulic fracturing of naturally fractured reservoirs. Surfactant enhanced oil recovery from naturally fractured reservoirs. A common scenario is low porosity and low permeability matrix blocks surrounded by a tortuous, highly permeable fracture network. Geologic analysis of naturally fractured reservoirs 2nd edition. Well production heterogeneity is a characteristic of most naturally fractured reservoirs. Geologic analysis of naturally fractured reservoirs 2nd. To describe flow in naturally fractured reservoirs, double pomsity model has been widely used.
In the past halfcentury, the study of fluid flow and transport processes in fractured porous media has received great attention and has been one of the most active areas in. The high permeabilities of the fractures effectively short circuits the matrix blocks, making it difficult to establish sufficiently high pressure gradients to allow effective viscous displacement of the oil in the matrix a new important effect comes into play imbibition. This large pressure drop causes the fracture pore volume, therefore fracture porosity, to increase. Natural fractures exist practically in all reservoirs, dividing the reservoir rock in pieces, called matrix blocks. Fracture porosity of naturally fractured reservoirs onepetro.
515 521 1550 1472 15 1621 750 1368 1115 831 921 813 528 1462 1482 358 1330 21 592 1148 912 1137 755 119 1408 613 1079 817 1573 1107 1318 1508 615 183 424 1404 1401 1348 753 942 503 800 622 1054 923 793