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Gas Dehydration Field Manual
 
 

Gas Dehydration Field Manual, 1st Edition

 
Gas Dehydration Field Manual, 1st Edition,Maurice Stewart,Ken Arnold,ISBN9781856179805
 
 
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Key Features

  • Include hydrate prevention, chemical injection systems, hydrate inhibitor methods
  • Condensation process, Glycol Regeneration and Molecular Sieves
  • An appendix provides the reader with additional exercises and solutions

Description

Gas Dehydration Field Manual presents different methods of gas dehydration, focusing on the differences between adsorption and absorption. It discusses the various designs and operations in a gas processing facility. As an introduction, the book provides different concepts and theories that describe the gas processing industry. It then discusses the processes involved in the gas processing industry, which include absorption, adsorption, glycol regeneration, glycol filtration, and carbon purification. The book is divided into three parts. The first part discusses some of the basic terms and concepts of gas dehydration. The second part focuses on the factors involved in the different gas-dehydration methods. It also describes the difference between absorption and adsorption, as well as the process involved in glycol dehydration. The last part of the book discusses the proper care, maintenance, and troubleshooting methods of glycol dehydration process. This book is mainly designed for engineers, technologists, and operating personnel in the gas processing industry. Aside from engineers and process designers, readers who are interested in the different processes involved in gas dehydration will find this book a useful guide and reference.

Readership

Production Engineers, Reservoir Engineer ,Chemical Engineers, Petroleum Engineers, Pipeline Engineers, Any engineers working with the production, transportation, or drilling of natural gas

Maurice Stewart

Dr. Maurice Stewart, PE, a Registered Professional Engineer with over 40 years international consulting experience in project management; designing, selecting, specifying, installing, operating, optimizing, retrofitting and troubleshooting oil, water and gas handling, conditioning and processing facilities; designing plant piping and pipeline systems, heat exchangers, pressure vessels, process equipment, and pumping and compression systems; and leading hazards analysis reviews and risk assessments.

Affiliations and Expertise

President, Stewart Training Company

View additional works by Maurice Stewart

Ken Arnold

Ken Arnold is a Senior Technical Advisor for WorleyParsons in Houston, TX. Spanning over 50 years of experience, he spent 16 years' in facilities engineering, project engineering and engineering management with Shell before forming Paragon Engineering Services in 1980. Arnold retired from Paragon in 2007 and formed K Arnold Consulting, Inc. In 2010, he joined WorleyParsons as part-time advisor while still managing the consulting firm. He participated in the initial development of several API safety related Recommended Practices including RP 75 and RP 14J and most recently was Chair of the National Academies Committee on Evaluating the Effectiveness of Offshore Safety and Environmental Management Systems. He has served on the Board of SPE as its first Director of Projects, Facilities and Construction and then later as VP Finance. He is currently Treasurer of The Academy of Medicine, Engineering and Science of Texas. Arnold has a BSCE degree from Cornell and MS degree from Tulane and has taught facilities engineering in the University of Houston Petroleum Engineering program and for several oil companies. He is a registered professional engineer and serves on the advisory board of the engineering schools of Tulane University, Cornell University and the Petroleum Engineering Advisory Board of the University of Houston. Recently, Ken received the 2013 Distinguished Achievement Award, considered one of the highest recognitions anyone can achieve in the offshore industry, at this year's Offshore Technology Conference in Houston, TX for his outstanding leadership and extensive contributions to the E&P industry. His many achievements include playing an integral role in the offshore industry's focus on safety through the development of Recommended Practices for offshore design and safety management, and he developed approaches to both equipment sizing and facility project management that are still in use today. He has also been instrumental in the effort to establish oilfield facilities engineering as a recognized technical engineering specialty.

Affiliations and Expertise

Ken Arnold Consulting Inc.

View additional works by Ken Arnold

Gas Dehydration Field Manual, 1st Edition


Part 1 Hydrate Prediction and Prevention

    Objectives

    Overview

         Dew Point

         Dew Point Depression

         Why Dehydrate?

    Water Content of Gas

         Introduction

         Partial Pressure and Fugacity

         Empirical Plots

         Sour Gas Correlations

         Effect of Nitrogen and Heavy Ends

         Example 1-1: Calculation of Water Content in a Sour Gas Stream

         Applications

         Amount of Water Condensed

    Gas Hydrates

         What Are Gas Hydrates?

         Why Is Hydrate Control Necessary?

         What Conditions Are Necessary to Promote Hydrate Formation?

         How Do We Prevent or Control Hydrates?

    Prediction of Operating Temperature and Pressure

         Wellhead Conditions

         Flowline Conditions

         Calculation of Temperature and Pressure at the Wellhead

         Calculation of Flowline Downstream Temperature

    Temperature Drop Determination

         Overview

         Temperature Drop Correlation

         Example 1-2: Determine the Temperature Drop across a Choke

    Hydrate Prediction Correlations

         Overview

         Vapor-Solid Equilibrium Constants

         Pressure-Temperature Curves

         Equations of State Calculations

         Vapor-Solid Equilibrium Constants

         Example 1-3: Determination of Hydrate Formation Temperature Using Vapor-Solid Constants

         Pressure-Temperature Curves

         Example 1-4: Determine the Hydrate Formation Temperature Using Pressure-Temperature Correlations

    Hydrate Prevention

         Overview

         Adding Heat

         Temperature Control

         Chemical Injection

         Comparison of Hydrate Prevention Methods

         Summary of Hydrate Prevention Methods

    Hydrate Inhibition

         Hammerschmidt Equation

         Determination of Total Inhibitor Required

         Procedure for Determining Inhibitor Requirements

         Example 1-5: Determining the Amount of Methanol Required in a Wet Gas Stream

    Exercises

Part 2 Dehydration Considerations

    Overview

    Adsorption

         Process Overview

         Principles of Adsorption

         Process Reversal

         Mass Transfer Zone (MTZ)

         Principles of Operation

         Effect of Process Variables

         Example 2-1: Determination of Pressure Drop through a Dry Bed Desiccant Dehydration Tower

         Equipment

         Inlet Gas Cleaning Equipment

         Adsorber Tower

         Insufficient Gas Distribution

         Inadequate Insulation

         Improper Bed Supports

         Pressurization

         Regeneration Gas Exchangers, Heaters, and Coolers

         Regeneration Gas Separator

         Control Valves

         Expander Plant Molecular Sieve Applications

    Desiccant Performance

         General Conditions

         Moisture Analyzer

         Effect of Contaminants in Inlet Feed Stream

         Effect of Regeneration Gases Rich in Heavy Hydrocarbons

         Effect of Methanol in the Inlet Gas Stream

         Useful Life

         Effect of Insufficient Reactivation

         Effect of High Reactivation Temperature

         Areas Requiring Engineering Attention

         Example 2-2: Preliminary Solid Bed Desiccant Design

    Absorption

         Process Overview

         Principles of Absorption

    Glycol Dehydration

         Principles of Operation

         Gas System

         Glycol System

         Effect of Operating Variables

    System Design

         Sizing Considerations

         Inlet Microfiber Filter Separator

         Glycol Gas Contactor

         Contactor Diameter

         Tray Design

         Tray Spacing

         Glycol Circulation Rate

         Lean Glycol Concentration

         Glycol-Glycol Preheater

         Glycol-Gas Cooler

         Glycol-Glycol Heat Exchanger

         Gas-Glycol-Condensate Separator

         Reconcentrator

         Heat Duty

         Fire Tube Sizing

         Reflux Condenser

         Stripping Still Column

         Diameter Size

         Packing

         Amount of Stripping Gas

         Filters

         Glycol Pumps

         Still Emissions

    Mercury Considerations

         Mercury

         Treatment

    Special Glycol Dehydration Systems

         General Considerations

         Drizo (wt.-2) Process

         Cold Finger Condenser Process

    Systems Utilizing Glycol-Gas Powered Pumps

    Systems Utilizing Electric Driven Pumps

         Example 2-3: Glycol Dehydration







    Nonregenerable Dehydrator

    Nonregenerable Dehydrator

         Overview

         Calcium Chloride Unit

    Physical Properties of Common Glycols

Part 3 Glycol Maintenance, Care, and Troubleshooting

    Preventive Maintenance

         Scheduled Preventive Maintenance

         Five Steps to a Successful Preventive Maintenance Program

         Record-Keeping

         Mechanical Maintenance

         Glycol Care

         Corrosion Control

         Communication

         General Considerations

         Oxidation

         Thermal Decomposition

         pH Control

         Salt Contamination

         Hydrocarbons

         Sludge

         Foaming

    Analysis and Control of Glycol

         General Considerations

         Visual Inspection

         Chemical Analysis

         Chemical Analysis Interpretation

    Troubleshooting

         General Considerations

         High Dew Points

         Glycol Loss from the Contactor

         Glycol Loss from the Reconcentrator

         Glycol Loss-Glycol Hydrocarbon Separator

         Glycol Loss-Miscellaneous

         Three-Step Approach to Troubleshooting

         Glycol System Cleaning

    Eliminating Operating Problems

         General Considerations

         Inlet Scrubber/Microfiber Filter Separator

         Absorber

         Glycol-Gas Heat Exchanger

         Lean Glycol Storage Tank or Accumulator

         Stripper or Still Column

    Improving Glycol Filtration

         General Considerations

    Use of Carbon Purification

         General Considerations

References

Index




 
 
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