Read it cover-to-cover as a complete primer, read it a section at a time as it comes up in your profession, and keep it handy as a quick reference.
New to this edition:
• A chapter on unconventional oil and gas (including gas shales)
• Modern tools used in well logging
• Modern drilling rig methods and equipment
• Expanded glossary includes 1,500 new terms
• More figures and plates
• Up-to-date statistics
* Course book based on course well completion design by TRACS International
* Unique in its field: Coverage of offshore, subsea, and landbased completions in all of the major hydrocarbon basins of the world.
* Full colour
Petroleum Production Systems, Second Edition, is the comprehensive source for clear and fundamental methods for about modern petroleum production engineering practice. Written by four leading experts, it thoroughly introduces modern principles of petroleum production systems design and operation, fully considering the combined behavior of reservoirs, surface equipment, pipeline systems, and storage facilities. Long considered the definitive text for production engineers, this edition adds extensive new coverage of hydraulic fracturing, with emphasis on well productivity optimization. It presents new chapters on horizontal wells and well performance evaluation, including production data analysis and sand management.
This edition featuresA structured approach spanning classical production engineering, well testing, production logging, artificial lift, and matrix and hydraulic fracture stimulation Revisions throughout to reflect recent innovations and extensive feedback from both students and colleagues Detailed coverage of modern best practices and their rationales Unconventional oil and gas well design Many new examples and problems Detailed data sets for three characteristic reservoir types: an undersaturated oil reservoir, a saturated oil reservoir, and a gas reservoir
The book's main focus is primarily on the equipment and processes used in exploring new resources; evaluating promising formations; drilling wells; managing oil and gas production; converting oil and gas into products; and transporting oil and gas. Separate chapters address the evolution and current structure of the petroleum industry; oil and gas trading; and challenges likely to face the oil and gas industry in coming years.
Three appendices define key industry terminology; suggest further reading on selected topics; and identify organizations that can provide more information.
*Provides complete coverage of the latest techniques used for designing and analyzing petroleum production systems
*Increases efficiency and addresses common problems by utilizing the computer-based solutions discussed within the book
* Presents principles of designing and selecting the main components of petroleum production systems
The book covers important topics, such as clean fuels, gasification, biofuels, and environmental impact of refining, which are not commonly discussed in most refinery textbooks. Throughout the source, problem sets and examples are given to help the reader practice and apply the fundamental principles of refining. Chapters 1-10 can be used as core materials for teaching undergraduate courses. The first two chapters present an introduction to the petroleum refining industry and then focus on feedstocks and products. Thermophysical properties of crude oils and petroleum fractions, including processes of atmospheric and vacuum distillations, are discussed in Chapters 3 and 4. Conversion processes, product blending, and alkylation are covered in chapters 5-10. The remaining chapters discuss hydrogen production, clean fuel production, refining economics and safety, acid gas treatment and removal, and methods for environmental and effluent treatments.
This source can serve both professionals and students (on undergraduate and graduate levels) of Chemical and Petroleum Engineering, Chemistry, and Chemical Technology. Beginners in the engineering field, specifically in the oil and gas industry, may also find this book invaluable.Provides balanced coverage of fundamental and operational topicsIncludes spreadsheets and process simulators for showing trends and simulation case studiesRelates processing to planning and management to give an integrated picture of refining
The book is packed with specific methods that can be applied quickly and accurately to almost any industry and any product to control documentation, request changes to the product, implement changes and develop bills of material.
The result is a powerful communications bridge between the engineering function and ‘the rest of the world’ that makes rapid changes in products and documentation possible. With the help of the simple techniques in the handbook, companies can gain and hold their competitive advantages in a world that demands flexibility and quick reflexes – and has no sympathy for delays.
The new edition sets EDC/CM in the context of Product Lifecycle Management (PLM), providing guidance on choosing, purchasing and implementing PLM software systems. Watts guides the reader to harness these tools and techniques for business objectives including Process Improvement and time-to-market.Solid, pragmatic ideas for real product and process cost reduction. According to one reviewer: ‘most books focus on the basics without examining all facets of each process area or functional area. This may be good for quickly learning, but it will only take the reader so far. Mr. Watts imparts the same information, but invites the reader to think and to consider strengths and weaknesses of processes and procedures. The copious examples, illustrations and breadth of topics covered make this book "the" reference on EDC and CM.’Strategic emphasis shows how processes may be integrated and tears down the ‘wall’ between Engineering and OperationsThorough description of Product Lifecycle Management software tools
The book has two themes: one, the idea of preventing damage, and preventing formation from drilling into an oil formation to putting the well introduction stage; and two, the utilization of nodal system analysis method, which optimizes the pressure distribution from reservoir to well head, and plays the sensitivity analysis to design the tubing diameters first and then the production casing size, so as to achieve whole system optimization. With this book, drilling and production engineers should be able to improve operational efficiency by applying the latest state of the art technology in all facets of well completion during development drilling-completion and work over operations.One of the only books devoted to the key technologies for all major aspects of advanced well completion activities.Unique coverage of all aspects of well completion activities based on 25 years in the exploration, production and completion industry.Matchless in-depth technical advice for achieving operational excellence with advance solutions.
Strengthened with updated material and a new chapter on wellbore cleaning, The Guide to Oilwell Fishing Operations, Second Edition ensures that the life of the well will be saved no matter the unforeseen circumstances. Crucial aspects include:Enhancements with updated equipment, technology, and a new chapter on wellbore cleaning methodsAdditional input from worldwide service companies, providing a more comprehensive balance Remains the only all-inclusive guide exclusively devoted to fishing tools, techniques, and rules of thumbRemodeled with latest jars on the market, catch tools, and retrieving stuck packers with cutting technologyImproved with information on methods such as sidetracking and plug-and-abandon operationsModernized with approaches and tactics on more advanced well projects such as high-angle deviated and horizontal wells and expandable casing technology to repair casing failure and leaks
Topics covered in the handbook include:Processes to enhance productionWell modification to maximize oil and gas recoveryCompletion and evaluation of wells, well testing, and well surveys
Reservoir Engineering Handbook, Fourth Edition provides solid information and insight for engineers and students alike on maximizing production from a field in order to obtain the best possible economic return. With this handbook, professionals will find a valuable reference for understanding the key relationships among the different operating variables. Examples contained in this reference demonstrate the performance of processes under forceful conditions through a wide variety of applications.
• Fundamental for the advancement of reservoir engineering concepts
• Step-by-step field performance calculations
• Easy to understand analysis of oil recovery mechanisms
• Step-by-step analysis of oil recovery mechanisms
• New chapter on fractured reservoirs
Fully updated and expanded, this edition combines extensive information from the published literature with significant material never before published. The authors introduce superior techniques for every major petroleum-related tectonic setting in the world.
Coverage includes:A systematic, ten-step philosophy for subsurface interpretation and mapping The latest computer-based contouring concepts and applications Advanced manual and computer-based log correlation Integration of geophysical data into subsurface interpretations and mapping Cross-section construction: structural, stratigraphic, and problem-solving Interpretation and generation of valid fault, structure, and isochore maps New coverage of 3D seismic interpretation, from project setup through documentation Compressional and extensional structures: balancing and interpretation In-depth new coverage of strike-slip faulting and related structures Growth and correlation consistency techniques: expansion indices, Multiple Bischke Plot Analysis, vertical separation versus depth, and more Numerous field examples from around the world
Whatever your role in the adventure of finding and developing oil or gas resources–as a geologist, geophysicist, engineer, technologist, manager or investor–the tools presented in this book can make you significantly more effective in your daily technical or decision-oriented activities.
Gas-Liquid And Liquid-Liquid Separators is divided into six parts: Part one and two covers fundamentals such as: physical properties, phase behaviour and calculations. Part three through five is dedicated to topics such as: separator construction, factors affecting separation, vessel operation, and separator operation considerations. Part six is devoted to the ASME codes governing wall thickness determination of vessel weight fabrication, inspection, alteration and repair of separators500 illustrationsEasy to understand calculations methodsGuide for protecting downstream equipmentHelps reduce the loss of expensive intermediate endsHelps increase product purity
Crossing the Rubicon is unique not only for its case-breaking examination of 9/11, but for the breadth and depth of its world picture—an interdisciplinary analysis of petroleum, geopolitics, narcotraffic, intelligence and militarism—without which 9/11 cannot be understood.
The US manufacturing sector has been mostly replaced by speculation on financial data whose underlying economic reality is a dark secret. Hundreds of billions of dollars in laundered drug money flow through Wall Street each year from opium and coca fields maintained by CIA-sponsored warlords and US-backed covert paramilitary violence. America’s global dominance depends on a continually turning mill of guns, drugs, oil and money. Oil and natural gas—the fuels that make economic growth possible—are subsidized by American military force and foreign lending.
In reality, 9/11 and the resulting “war on terror” are parts of a massive authoritarian response to an emerging economic crisis of unprecedented scale. Peak Oil—the beginning of the end for our industrial civilization—is driving the élites of American power to implement unthinkably draconian measures of repression, warfare and population control. Crossing the Rubicon is more than a story. It is a map of the perilous terrain through which, together and alone, we are all now making our way.
The book's extensive coverage of the subject should be of special interest to reservoir geologists and engineers, production engineers and technologists, and well log analysts.
Standard Handbook of Petroleum and Natural Gas Engineering, Third Edition,provides you with the best, state-of-the-art coverage for every aspect of petroleum and natural gas engineering. With thousands of illustrations and 1,600 information-packed pages, this handbook is a handy and valuable reference. Written by dozens of leading industry experts and academics, the book provides the best, most comprehensive source of petroleum engineering information available. Now in an easy-to-use single volume format, this classic is one of the true "must haves" in any petroleum or natural gas engineer's library. A classic for over 65 years, this book is the most comprehensive source for the newest developments, advances, and procedures in the oil and gas industry. New to this edition are materials covering everything from drilling and production to the economics of the oil patch. Updated sections include: underbalanced drilling; integrated reservoir management; and environmental health and safety. The sections on natural gas have been updated with new sections on natural gas liquefaction processing, natural gas distribution, and transport. Additionally there are updated and new sections on offshore equipment and operations, subsea connection systems, production control systems, and subsea control systems. Standard Handbook of Petroleum and Natural Gas Engineering, Third Edition, is a one-stop training tool for any new petroleum engineer or veteran looking for a daily practical reference.Presents new and updated sections in drilling and productionCovers all calculations, tables, and equations for every day petroleum engineersFeatures new sections on today's unconventional resources and reservoirs
The prefect companion for new engineers who need to develop and apply their skills more efficiently or experienced engineers who wish further develop their knowledge of best practice techniques, this manual covers basic electrical engineering, hydraulics and systems analysis before addressing pump components such as centrifugal pumps, motors, seals, separators, and cables. In addition, the author includes comprehensive sections on analysis and optimization, monitoring and trouble-shooting, and installation design and installation under special conditions.
* Apply the best operating practices to optimise production
* Track and troubleshoot problems such as gas, solids and corrosion
*Prevent expensive failures such as cable burn and impeller cavitation
* Design and analyze a system using up-to-date computer programs
* Establish ESP analysis monitoring methods and strategies
* Ensure optimum operator-vendor relationship for mutual benefits
Designed for those new to FTIR, but with enough reference material to appeal to journeyman and expert spectroscopists, this book does not demand any extensive familiarity with chemistry or physics. Specializing in concise and comprehensible explanations of FTIR topics, the author introduces the field of infrared spectroscopy, including the strengths and weaknesses of FTIR as a chemical analysis technique. He then describes the instrument itself and explores topics such as how an interferometer generates a spectrum, optimization of spectral quality, and which tests are used to monitor instrument health.
The book discusses how to properly use spectral processing to increase the information of a spectrum without damaging the data and takes considerable care in instructing on sample preparation, as good sample preparation constitutes half the battle in extracting good data. The final chapters examine single analyte quantitative analysis and conclude with an overview of infrared microscopy.
Drawing on the experience and knowledge of the author as both a professor and practitioner, Fundamentals of Fourier Transform Infrared Spectroscopy offers up-to-date information given in clear, easily understood language to appeal to beginner and expert spectroscopists alike. The author maintains a website and blog with supplemental material. His training course schedule is also available online.
For professionals in the coating and drying industry, the world is a demanding place. New, technically complex products such as fuel cell membranes, thin film batteries, solar cells, and RFID chips require coatings of extreme precision. With the bar raised so high, understanding how to troubleshoot and eliminate defects on a coating line is an essential skill for all personnel.
Coating and Drying Defects, Second Edition provides manufacturing and quality control personnel, equipment operators and supervisors, and plant engineers and scientists with the full complement of proven tools and techniques for detecting, defining, and eliminating coating defects and operating problems, and for ensuring that they do not recur.
Updating the valuable contents of the first edition, this practical Second Edition:Describes all major processes for coating and drying of continuous film on sheets or webs Covers technologies that have been recently developed to prevent defect formation and improve operating procedures Provides a rational framework within which to assess and analyze virtually any defect that may arise Offers step-by-step guidelines for conducting every phase of the troubleshooting process, including defect prevention Going beyond simply describing a disparate set of troubleshooting techniques, this unique guide arms readers with a systematic, nonmathematical methodology encompassing the entire coating operation, becoming an indispensable resource for manufacturing and quality-control personnel as well as plant engineers, polymer scientists, surface scientists, organic chemists, and coating scientists.
This text offers a thorough overview of the operating characteristics, efficiencies, design features, troubleshooting, and maintenance of dynamic and positive displacement process gas compressors. The author examines a wide spectrum of compressors used in heavy process industries, with an emphasis on improving reliability and avoiding failure. Readers learn both the theory underlying compressors as well as the myriad day-to-day practical issues and challenges that chemical engineers and plant operation personnel must address.
The text features:Latest design and manufacturing details of dynamic and positive displacement process gas compressors Examination of the full range of machines available for the heavy process industries Thorough presentation of the arrangements, material composition, and basic laws governing the design of all important process gas compressors Guidance on selecting optimum compressor configurations, controls, components, and auxiliaries to maximize reliability Monitoring and performance analysis for optimal machinery condition Systematic methods to avoid failure through the application of field-tested reliability enhancement concepts Fluid instability and externally pressurized bearings Reliability-driven asset management strategies for compressors Upstream separator and filter issues
The text's structure is carefully designed to build knowledge and skills by starting with key principles and then moving to more advanced material. Hundreds of photos depicting various types of compressors, components, and processes are provided throughout.
Compressors often represent a multi-million dollar investment for such applications as petrochemical processing and refining, refrigeration, pipeline transport, and turbochargers and superchargers for internal combustion engines. This text enables the broad range of engineers and plant managers who work with these compressors to make the most of the investment by leading them to the best decisions for selecting, operating, upgrading, maintaining, and troubleshooting.
* Covers the technologies and operations of petroleum refineries
* Provides material on operating a jointly owned and operated refinery
* Gives readers a comprehensive introduction to petroleum refining, as well as a full reference to engineers in the field
· New in-depth coverage of hydrocarbon characteristics, the different kinds of reservoirs, and impurities in crude.
· Practical suggestions help readers understand the art and science of handling produced liquids.
· Numerous, easy-to-read figures, charts, tables, and photos clearly explain how to design, specify, and operate oilfield surface production facilities.
Forbes Southwest Bureau chief Christopher Helman has covered the energy industry since 2004. Here youÕll find 21 tales of living legends like Aubrey McClendon, Richard Kinder and Harold Hamm, profiles of energy giants Saudi Aramco, ExxonMobil, Chevron and Total, and interviews with innovators in biofuels and Peak Oil pessimists, along with an investigation into Goldman SachsÕ likely role in manipulating oil prices. For anyone who wants to know how oil impacts our lives and those interested in where the industry is headed, look no further than Booms, Busts And Billionaires: A Decade Of Forbes Oil Stories.
An international effort and industry-academia collaboration, this volume features expert contributions, focusing on the contemporary state-of-the-art concerning the many facets of the production of detergents and surfactants.
Thus, the Handbook of Detergents, Part F – Production, deals with the production of anionic, cationic, nonionic, and amphoteric surfactants, key builders, bleaching and whitening agents, enzymes and other components of detergent formulations in different contexts, gauges and related concerns, and discusses various technological procedures of production processes involving the components of surfactants and detergents.
Key features include;
Common examples that will enable engineers to achieve increased unit savings
Updated with the latest process technologies for handling residue and "deep" hydrotreated feedstock
New chapter discussing refractory lining, providing an introduction to the different refractories employed in FCC units, examples of various refractory linings and associated anchors, installation techniques as well as some guidelines for proper drying and curing refractory lining.
New troubleshooting chapter, increasing the practical application of the book, along with new visual references to operation optimization
About the author;
Reza Sadeghbeigi is President of RMS Engineering, Inc. a Houston, Texas based engineering firm providing high‐level technical expertise in the area of fluid catalytic cracking (FCC) and related processes.
Reza has 35 years of hands-on FCC experience in the refining industry, focusing on technical services, troubleshooting, process design, and project management, including major FCC revamps. A licensed Professional Engineer (P.E.) in Texas and Louisiana, Reza has published technical papers and produced industry seminars on refining and catalytic cracking operations and conducted numerous client customized FCC training courses and public seminars.
The only practical approach, with tools and techniques for those with FCC responsibilities to help maximize the profitability and reliability of fluid catalytic cracking operations.
Updated throughout, with new material focusing on latest developments, the shift to using FCC to process lower quality crudes, and new applied material on troubleshooting.
Provides a reference for both experienced engineers who need a quick reference, as well as providing those who are developing their skills and knowledge with access to trusted information that will help them succeed in their projects.
With their timely new book, authors Andrew Inkpen and Michael H. Moffett have written a nontechnical book to help readers with technical backgrounds better understand the business of oil and gas. They describe and analyze the global oil and gas industry, focusing on its strategic, financial, and business aspects and addressing a wide range of topics organized around the oil and gas industry value chain, starting with exploration and ending with products sold to consumers.
The Global Oil & Gas Industry is a single source for anyone interested in how the business of the world�s largest industry actually works: business executives, students, government officials and regulators, professionals working in the industry, and the general public.
This new book introduces different types of geophysical logs and subsurface maps that can be generated from basic well data, and subsurface problems that can be solved using geophysical logs and subsurface maps. "Hands-on" exercises reveal how each map type is generated and what applications they may have. Exercises at the end of each chapter introduce different types of wells and lithologies.
The Third Edition includes new exercises in each chapter that provide practice in a technique immediately after discussion or example and encourage self-study. The first ten chapters are constructed around a sequence of mathematical topics, with a gradual progression into more advanced material. The final chapter discusses mathematical topics needed in the analysis of experimental data.
* Numerous examples and problems interspersed throughout the presentations
* Each extensive chapter contains a preview, objectives, and summary
* Includes topics not found in similar books, such as a review of general algebra and an introduction to group theory
* Provides chemistry specific instruction without the distraction of abstract concepts or theoretical issues in pure mathematics
Completely revised and updated throughout, this new edition of a GPP industry standard has completely new sections on coalbed methane, CO2 sequestration (important for environmental concerns), Co2 Flood, more sophisticated petrophysical models for geoscientists, examples of subsidence, additional geomechanical calculations, and much more. What makes this book so different and valuable to the engineer is the accompanying software, used by reservoir engineers all over the world every day. The new software, IFLO (replacing WINB4D, in previous editions), is a simulator that the engineer can easily install in a Windows operating environment. IFLO generates simulations of how the well can be tapped and feeds this to the engineer in dynamic 3D perspective. This completely new software is much more functional, with better graphics and more scenarios from which the engineer can generate simulations.
This book and software helps the reservoir engineer do his or her job on a daily basis, better, more economically, and more efficiently. Without simulations, the reservoir engineer would not be able to do his or her job at all, and the technology available in this product is far superior to most companies’ internal simulation software. It is also much less expensive ($89.95 versus hundreds or even thousands of dollars) than off-the-shelf packages available from independent software companies servicing the oil and gas industry. It is, however, just as, or more accurate than these overpriced competitors, having been created by a high-profile industry expert and having been used by engineers in the real world with successful and profitable results.This reference is THE industry standard to successfuly modelling reservoirs, obtaining maximum supply and profiting from oil and gas reservoirsIncludes dowloadable software of the new IFLO reservoir simulation software, that can save your company thousands of dollarsThis edition has been updated to included new sections on environmentally important issues such as CO2 sequestration, coalbed methane, CO2 FloodThe third edition also provides more sophisticated petrophysical models, examples of subsidence and additional geomechanical calculations
Elements of Petroleum Geology begins with an account of the physical and chemical properties of petroleum, reviewing methods of petroleum exploration and production. These methods include drilling, geophysical exploration techniques, wireline logging, and subsurface geological mapping. After describing the temperatures and pressures of the subsurface environment and the hydrodynamics of connate fluids, Selley examines the generation and migration of petroleum, reservoir rocks and trapping mechanisms, and the habit of petroleum in sedimentary basins. The book contains an account of the composition and formation of tar sands and oil shales, and concludes with a brief review of prospect risk analysis, reserve estimation, and other economic topics.Updates the Second Edition completelyReviews the concepts and methodology of petroleum exploration and productionWritten by a preeminent petroleum geologist and sedimentologist with decades of petroleum exploration in remote corners of the worldContains information pertinent to geophysicists, geologists, and petroleum reservoir engineersUpdated statistics throughoutAdditional figures to illustrate key points and new developmentsNew information on drilling activity and production methods including crude oil, directional drilling, thermal techniques, and gas playsAdded coverage of 3D seismic interpretationNew section on pressure compartmentsNew section on hydrocarbon adsorption and absorption in source rocksCoverage of The Orinoco Heavy Oil Belt of VenezuelaUpdated chapter on unconventional petroleum
It covers the fundamental reservoir engineering principles involved in the analysis of fluid flow through fractured reservoirs, the application of existing models to field cases, and the evaluation and description of reservoirs, based on processed data from pressure and production tests. The author also discusses production decline analysis, the understanding of which is a key factor influencing completion or abandonment of a well or even a field.
The theoretical concepts are presented as clearly and simply as possible in order to aid comprehension. The book is thus suitable for training and educational purposes, and will help the reader who is unfamiliar with the subject acquire the necessary skills for successful interpretation and analysis of field data.
One of the most important features of the book is that it fills the gap between field operations and research, in regard to proper management of reservoirs. The book also contains a computer program (FORTRAN language) which can be incorporated in existing software designed for reservoir evaluation; type curves generation, test design and interpretation, can be achieved by using this program.
Petroleum engineers, reservoir engineers, petroleum geologists, research engineers and students in these fields, will be interested in this book as a reference source. It can also be used as a text book for training production and reservoir engineering professionals. It should be available in university and oil company libraries.
The problems of abnormally high formation pressures encountered in the subsurface while drilling for petroleum are very diverse, involving geologists, geophysicists, reservoir engineers, drilling engineers, and borehole logging engineers. The acute anticipation of such pressures before drilling has become possible with modern technology. This book treats these developments and covers the following topics: world occurrences, the geology of abnormal pore pressures and the background theory, reservoir engineering aspects of abnormally pressured reservoirs, detection of abnormal pressures by geophysical methods before drilling and during drilling, and their evaluation after drilling. It examines the special problems of shallow hazards from shallow abnormal pressures, and relief-well engineering to control blowouts. It also examines the generation of abnormal pressures from hydrocarbon generation in the Rocky Mountains, and the distribution of abnormal pressures in south Louisiana, USA. The topics are examined from a practical point of view with a theoretical background. There is a glossary of terms, and a relevant practical conversion table. Both SI units and the conventional US oil industry units are used.
This convenient volume provides engineers with hundreds of common sense techniques, shortcuts, and calculations to quickly and accurately solve day-to-day design, operations, and equipment problems. Here, in a compact, easy-to-use format, are practical tips, handy formulas, correlations, curves, charts, tables, and shortcut methods that will save engineers valuable time and effort.
* The standard handbook for chemical and process engineers
* All new material on pinch point analysis on networks of heat exchangers and updates on gas treating in process design and heat transfer
* Hundreds of common sense techniques and calculations
Designed as a bridge to allow a smooth and confident transition for personnel coming from a chemistry background into the practical world of explosives, Chemistry of Pyrotechnics: Basic Principles and Theory, Second Edition emphasizes basic chemical principles alongside practical, hands-on knowledge in the preparation of energetic mixtures. It examines the interactions between and adaptations of pyrotechnics to changing technology in areas such as obscuration science and low-signature flame emission.
Much more than a simple how-to guide, the book discusses chemical and pyrotechnic principles, components of high-energy mixtures, and elements of ignition, propagation, and sensitivity. It offers heat compositions, including ignition mixes, delays, thermites, and propellants and investigates the production of smoke and sound as well as light and color.
Promoting the growth and expansion of pyrotechnics as a science, Chemistry of Pyrotechnics: Basic Principles and Theory, Second Edition provides practitioners with the ability to apply chemical principles and logic to energetic materials and thereby make the field as productive, useful, and safe as possible.