Download or read book Gas assisted acidizing of carbonate reservoirs written by Suneet Shukla and published by . This book was released on 2002 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Matrix Acidizing of Carbonate Reservoir written by Ehsan Khamehchi and published by Springer Nature. This book was released on with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrated Method to Evaluate Acid Stimulation of Horizontal Wells in Carbonate Reservoir Through Treatment Pressure Analysis written by Kenji Ueda and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlocking a tight carbonate formation for oil and gas production by multi-stage acid stimulation is a relatively cost-effective method as an alternative to propped fracturing for production enhancement. Depending on whether treatment pressure is below or above the formation closure stress, acid stimulation is basically divided into matrix acidizing and acid fracturing. In this study, practical methodology to evaluate both matrix acidizing and acid fracturing through treatment monitoring is presented respectively. For matrix acidizing, monitoring and optimizing a matrix acidizing has been achieved by integrating a forward model used in acidizing design for horizontal wells with a real-time monitoring model for skin evolution during the stimulation. The effect of acidizing is described as an overall skin factor change, and productivity improvement is predicted for the treatment. Then the field treatment data monitored on-site was used to estimate the skin response by treatment injection. History matching procedure of design and actual treatment data will be carried out to update near-wellbore and key wormholing parameters. Through sensitivity study, which parameter should be updated is discussed. Finally optimum rate schedule is identified based on updated parameters. Meanwhile, for acid fracturing treatment, new method for real-time monitoring of acid fracturing, the inverse injectivity vs. superposition time function plot is proposed, subject to the condition that the treatment pressure is above closure pressure after the breakdown. Combining a linear dual-porosity transient slab model with injectivity concept, actual growing cross-sectional area induced by acid fracturing treatment can be monitored in real-time. After production starts, linear flow diagnostic approach with rate-transient analysis provides cross-sectional area flowing from matrix, which is compared with the area induced by acid fracturing during the stimulation. The treatment efficiency provides engineers with additional information as to whether the designed acid fracturing was performed appropriately under the in-situ closure stress field. A field case example of both multi-stage matrix acidizing and acid fracturing acid in horizontal well are also presented respectively in the study to illustrate the application of the approach developed, and to show the value of the integrated approach to monitor and diagnose acid stimulation in horizontal wells. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155416
Download or read book A Placement Model for Matrix Acidizing of Vertically Extensive Multilayer Gas Reservoirs written by Manabu Nozaki and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Design of matrix acidizing treatments of carbonate formation is still a challenge although extensive research has been done on it. It is necessary to estimate acid distribution along the wellbore. This estimation is very important especially for the case where the reservoir properties vary along the wellbore. This work provides development and application of an apparent skin factor model which accounts for both damage and mobility difference between acid and gas. Combining this model with a conventional acid placement model, we develop an acid placement model for vertically extensive, multilayer gas reservoirs. A computer program is developed implementing the acid placement model. The program is used to simulate hypothetical examples of acid placement for vertically extensive, multilayer gas reservoirs. This model will improve matrix acidizing for gas reservoirs and enable realtime monitoring of acid stimulation more accurately.
Download or read book Microemulsions written by Monzer Fanun and published by CRC Press. This book was released on 2008-12-15 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effective use of microemulsions has increased dramatically during the past few decades as major industrial applications have expanded in a variety of fields. Microemulsions: Properties and Applications provides a complete and systematic assessment of all topics affecting microemulsion performance and discusses the fundamental characteristics, t
Download or read book Gas Injection and Mobility Control in Fractured Oil wet Carbonate Reservoirs written by Jimin Daniel Zhou and published by . This book was released on 2018 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Waterflooding in low permeability, fractured and oil-wet carbonate reservoirs yields extremely low oil recovery due to bypassing through fractures and little imbibition into the matrix resulting in a large amount of oil remaining in the reservoir. Gravity-aided gas injection is studied at the lab-scale in this work to enhance oil recovery from fractured reservoirs. The miscibility of the gas with a model oil (decane with naphthenic acid) is varied by enriching the methane with ethane. Mobility of the gas is decreased by incorporating the gas in foam or glycerol-alternating-gas floods. As the miscibility increases, the oil recovery increases, but reaches a plateau above the near-miscible conditions. The foam flood improves oil recovery by diverting gas into the matrix, if the gas is sufficiently soluble in the oil and the gas-oil capillary pressure is sufficiently low. The pressure gradient generated in the fracture by foam helps in the diversion of the gas into the matrix. Glycerol-alternating-gas floods result in minor additional oil recovery over foam floods because the pressure gradients are about the same as those observed in foam floods. Secondary foam flooding achieves similar ultimate oil recovery values as tertiary foam flooding, but at faster rates. Simulations of gas floods show the presence of three different gas fronts during the experiments. Miscible and near-miscible foam floods increased the oil recovery to high values (about 85% OOIP) in core floods and their scale-up to field-scale warrants further study.
Download or read book Numerical Modeling of Matrix Acidizing in Carbonate and Sandstone Reservoirs written by Wan Wei and published by . This book was released on 2020 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Matrix acidizing is a stimulation technique to improve productivity/injectivity in the near-wellbore region in carbonate and sandstone reservoirs. Carbonate reservoir is heterogeneous in mineralogy, primary porosity, and secondary porosity such as fractures. Optimally through acidizing treatment, wormholes are generated in carbonate reservoirs to improve the permeability and bypass the damaged zone. A two-scale continuum model is implemented in a radial coordinate system to simulate acidizing process in the near-wellbore geometry. The model is extended from single-phase to two-phase by considering mobility change due to water-oil displacement and defining a new criterion for acidizing breakthrough applicable to two-phase flow. The requirement of acid consumption is lower with the existence of oil prior to acidizing treatment. This indicates that for field treatment, maintaining a higher oil saturation can enhance acidizing efficiency. To consider varying mineral compositions in carbonates, the acidizing model is implemented in the UTCOMP-IPhreeqc coupled software to model homogeneous and heterogeneous reactions among acid and minerals. Different acid pore volumes are predicted for limestone, dolostone, and partially dolomitized formation due to the difference in reaction rate and dissolution structures generated. To consider fracture effect in carbonates, the acidizing model in UTCOMP-IPhreeqc is extended to consider reactions on the fracture surface with the aid of EDFM (Embedded Discrete Fracture Model). The fracture with a high conductivity will receive most acid and slow down the wormhole propagation in the matrix. To improve computational efficiency, the acidizing model is also implemented in the semi-parallel version of UTCOMP-IPhreeqc, with the parallelized geochemical calculation. Besides, speedup techniques through defining a tolerance on the relative amount change of geochemical elements to reduce IPhreeqc calls are also applied. Parallel computing saves up to 85% of the total computational time when using 16 processors. And speedup techniques obtain about 50% improvement for the wormhole pattern. The acidizing model in UTCOMP-IPhreeqc is also extended to simulate acidizing process in sandstone reservoirs through modifying IPhreeqc database to include primary and secondary reactions. A largest possible injection rate is recommended to achieve best performance mitigating formation damage caused by precipitation
Download or read book Ultradeep Carbonate Gas Reservoirs written by Lu Wang and published by Springer Nature. This book was released on 2023-01-30 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a systematical investigation on the reservoir characteristics and percolation mechanism of ultradeep carbonate gas reservoirs, including reservoir characteristics and classification, gas storage and percolation capacities, gas-phase and gas-water two-phase percolation mechanism, microscale complex gas-water relationship, reservoir sensitivity characteristics, and gas production characteristics of heterogeneous carbonate reservoirs. Some advanced and improved experimental techniques and analytical methods are introduced and applied, including comprehensive evaluation technique of storage and percolation capacities, ultra-high temperature and pressure physical simulation experiment technique, microscopic visualization technique based on CT scanning and microelectronics lithography, and physical simulation technique for heterogeneous reservoir development. In addition, it summarizes strategies for the efficient development of ultradeep carbonate gas reservoirs based on these theoretical research results. The key techniques and methods introduced in this monograph satisfy the need for efficient development of ultradeep carbonate gas reservoirs and provide theoretical basis and methodological value for investigations on similar gas reservoirs. This book serves as a reference for engineering technical professionals, researchers, and graduate students who are engaged in the exploration and development of carbonate gas reservoirs.
Download or read book Proceedings of the International Field Exploration and Development Conference 2019 written by Jia'en Lin and published by Springer Nature. This book was released on 2020-07-11 with total page 3907 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected papers from the 8th International Field Exploration and Development Conference (IFEDC 2019) and addresses a broad range of topics, including: Low Permeability Reservoir, Unconventional Tight & Shale Oil Reservoir, Unconventional Heavy Oil and Coal Bed Gas, Digital and Intelligent Oilfield, Reservoir Dynamic Analysis, Oil and Gas Reservoir Surveillance and Management, Oil and Gas Reservoir Evaluation and Modeling, Drilling and Production Operation, Enhancement of Recovery, Oil and Gas Reservoir Exploration. The conference not only provided a platform to exchange experiences, but also promoted the advancement of scientific research in oil & gas exploration and production. The book is chiefly intended for industry experts, professors, researchers, senior engineers, and enterprise managers.
Download or read book Reservoir Formation Damage written by Faruk Civan and published by Elsevier. This book was released on 2011-08-30 with total page 1135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reservoir Formation Damage, Second edition is a comprehensive treatise of the theory and modeling of common formation damage problems and is an important guide for research and development, laboratory testing for diagnosis and effective treatment, and tailor-fit- design of optimal strategies for mitigation of reservoir formation damage. The new edition includes field case histories and simulated scenarios demonstrating the consequences of formation damage in petroleum reservoirsFaruk Civan, Ph.D., is an Alumni Chair Professor in the Mewbourne School of Petroleum and Geological Engineering at the University of Oklahoma in Norman. Dr. Civan has received numerous honors and awards, including five distinguished lectureship awards and the 2003 SPE Distinguished Achievement Award for Petroleum Engineering Faculty. Petroleum engineers and managers get critical material on evaluation, prevention, and remediation of formation damage which can save or cost millions in profits from a mechanistic point of view State-of-the-Art knowledge and valuable insights into the nature of processes and operational practices causing formation damage Provides new strategies designed to minimize the impact of and avoid formation damage in petroleum reservoirs with the newest drilling, monitoring, and detection techniques
Download or read book JPT Journal of Petroleum Technology written by and published by . This book was released on 2001-07 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbonate Reservoir Characterization written by F. Jerry Lucia and published by Springer Science & Business Media. This book was released on 2007-11-30 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: F. Jerry Lucia, working in America’s main oil-rich state, has produced a work that goes after one of the holy grails of oil prospecting. One main target in petroleum recovery is the description of the three-dimensional distribution of petrophysical properties on the interwell scale in carbonate reservoirs. Doing so would improve performance predictions by means of fluid-flow computer simulations. Lucia’s book focuses on the improvement of geological, petrophysical, and geostatistical methods, describes the basic petrophysical properties, important geology parameters, and rock fabrics from cores, and discusses their spatial distribution. A closing chapter deals with reservoir models as an input into flow simulators.
Download or read book Numerical Simulation of Acid Stimulation Treatments in Carbonate Reservoirs written by Rencheng Dong and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Matrix acidizing and acid fracturing are two main types of acid stimulation treatments that are extensively employed by industry in carbonate reservoirs to improve permeability and enhance production. Matrix acidizing involves injecting acid to dissolve minerals in order to create long highly conductive channels (wormholes) whereas acid fracturing is used to etch fracture surfaces and create fracture conductivity. Numerical modeling of acid stimulation treatments couples processes of fluid flow, reactive transport, and rock dissolution, which imposes great computational challenges. The purpose of this dissertation is to develop efficient and accurate numerical models for acidizing process and acid fracturing process respectively. In most of matrix acidizing simulations, acid transport is generally solved by a single-point upwinding (SPU) scheme based on finite volume method. Simulation results of wormhole growth may have large numerical errors due to grid orientation effect of SPU scheme. In this work, we apply adaptive enriched Galerkin (EG) methods for solving coupled flow and reactive transport equations of acidizing model. EG is constructed by enriching the standard continuous Galerkin (CG) finite element method with piecewise constant functions. Since EG is a higher-order method compared with standard finite volume method, EG reduces non-physical numerical errors caused by grid orientation effect. Wormhole growth usually exhibits fingering patterns, which requires very fine mesh to resolve. Instead of global mesh refinement, we apply adaptive mesh refinement technique to dynamically refine the mesh in the vicinity of wormhole interfaces and coarsen the mesh after dissolution fronts pass. The simulation runtime using adaptive mesh is only about 30% of the runtime using globally refined mesh in our numerical examples. The key to success in acid fracturing treatments is to achieve non-uniform acid etching on fracture surfaces. Carbonate reservoir heterogeneity such as heterogeneous mineral distribution can lead to non-uniform acid etching. In addition, the non-uniform acid etching can be enhanced by the viscous fingering mechanism. By injecting a low-viscosity acid into a high-viscosity polymer pad fluid, acid tends to form viscous fingers and etch fracture surfaces non-uniformly. Acid fracturing simulations rarely modeled the effect of acid viscous fingering. In this work, a 3D acid fracturing model is developed to simulate acid etching process with acid viscous fingering. Our acid fracturing model considers fluid flow inside the fracture, acid and polymer transport, and change of fracture geometry due to mineral dissolution. A numerical simulator is developed to solve the acid fracturing model and compute the rough acid fracture geometry induced by non-uniform acid etching. We investigate the effects of viscous fingering, perforation design, and alternating injection of pad and acid fluids on the acid etching process. Our model is capable of simulating growth of acid-etched channels caused by acid viscous fingering. According to our simulation results, properly increasing the number of perforations can restrain the height of acid-etched channels and help sustain acid fracture conductivity under the reservoir closure stress. Compared with single-stage acid injection, multi-stage alternating injection of pad and acid fluids leads to narrower and longer acid-etched channels, which improves the effectiveness of acid fracturing treatments
Download or read book Petrophysics written by Erle C. Donaldson and published by Elsevier. This book was released on 2004-01-24 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt: The petroleum geologist and engineer must have a working knowledge of petrophysics in order to find oil reservoirs, devise the best plan for getting it out of the ground, then start drilling. This book offers the engineer and geologist a manual to accomplish these goals, providing much-needed calculations and formulas on fluid flow, rock properties, and many other topics that are encountered every day. New updated material covers topics that have emerged in the petrochemical industry since 1997. Contains information and calculations that the engineer or geologist must use in daily activities to find oil and devise a plan to get it out of the ground Filled with problems and solutions, perfect for use in undergraduate, graduate, or professional courses Covers real-life problems and cases for the practicing engineer
Download or read book Production Chemicals for the Oil and Gas Industry Second Edition written by Malcolm A. Kelland and published by CRC Press. This book was released on 2014-03-13 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Production chemistry issues result from changes in well stream fluids, both liquid and gaseous, during processing. Since crude oil production is characterized by variable production rates and unpredictable changes to the nature of the produced fluids, it is essential for production chemists to have a range of chemical additives available for rectifying issues that would not otherwise be fully resolved. Modern production methods, the need to upgrade crude oils of variable quality, and environmental constraints demand chemical solutions. Thus, oilfield production chemicals are necessary to overcome or minimize the effects of the production chemistry problems. Production Chemicals for the Oil and Gas Industry, Second Edition discusses a wide variety of production chemicals used by the oil and gas industry for down-hole and topside applications both onshore and offshore. Incorporating the large amount of research and applications since the first edition, this new edition reviews all past and present classes of production chemicals, providing numerous difficult-to-obtain references, especially SPE papers and patents. Unlike other texts that focus on how products perform in the field, this book focuses on the specific structures of chemicals that are known to deliver the required or desired performance—information that is very useful for research and development. Each updated chapter begins by introducing a problem, such as scale or corrosion, for which there is a production chemical. The author then briefly discusses all chemical and nonchemical methods to treat the problem and provides in-depth descriptions of the structural classes of relevant production chemicals. He also mentions, when available, the environmental properties of chemicals and whether the chemical or technique has been successfully used in the field. This edition includes two new chapters and nearly 50 percent more references.
Download or read book An investigation of enriched gas displacement process in high relief carbonate reservoirs written by and published by . This book was released on 1972 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Matrix Acidizing of Heterogeneous Carbonates written by Ryan Keys and published by LAP Lambert Academic Publishing. This book was released on 2011-03-01 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: In matrix acidizing, the goal is to dissolve minerals in the rock to increase well productivity. This is accomplished by injecting an application-specific solution of acid into the formation at a pressure between the pore pressure and fracture pressure. A hydrochloric acid solution is used in carbonate reservoirs, which actually dissolves the calcite rock matrix in the form of conductive channels called wormholes. These wormholes propagate from the wellbore out into the reservoir, bypassing the damaged zone. In matrix acidizing of carbonates, there are four parameters that affect performance: the concentration of calcite present, injection rate of the acid, reaction type, and heterogeneity. Of these parameters, this paper will focus on how rock heterogeneity affects performance. To do this, a coreflood and acidizing apparatus was used to acidize heterogeneous limestone core samples. Rock characterizations and volumetric measurements were considered with the results from these experiments, which made it possible to correlate and quantify the results with rock and volume parameters.
