Series Preface |
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ix | |
Preface |
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xiii | |
Authors |
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xv | |
1 Introduction |
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1 | (8) |
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1.1 Background of Wax Deposition |
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1 | (4) |
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1.2 Overview of Wax Testing, Modeling, and Management |
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5 | (4) |
2 Experimental Characterization of Important Wax Thermodynamic Properties |
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9 | (32) |
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9 | (1) |
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2.2 Determination of the WAT |
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10 | (20) |
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12 | (2) |
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14 | (3) |
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2.2.3 Fourier-Transform Infrared Spectroscopy |
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17 | (2) |
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19 | (2) |
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2.2.5 Thermal Techniques-DSC |
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21 | (5) |
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2.2.6 Comparison between Different WAT Measurements |
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26 | (3) |
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2.2.7 Other Techniques That Are Under Development |
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29 | (1) |
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2.3 Determination of the WPC |
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30 | (8) |
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2.3.1 Differential Scanning Calorimetry |
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30 | (3) |
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2.3.2 Characterization of WPC Using NMR |
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33 | (1) |
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2.3.3 Characterization of WPC Using FT-IR |
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34 | (1) |
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2.3.4 Separation-Based Methods for WPC Determination |
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35 | (3) |
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2.4 Experimental Techniques for the Characterization of Precipitated Wax |
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38 | (2) |
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40 | (1) |
3 Thermodynamic Modeling of Wax Precipitation |
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41 | (26) |
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41 | (1) |
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3.2 Fundamental Thermodynamics of Wax Precipitation |
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42 | (2) |
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3.3 Step 1 in Thermodynamic Modeling: Construction of the Thermodynamic Equations |
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44 | (5) |
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3.4 Step 2 in Thermodynamic Modeling: Simplification of Thermodynamic Equations |
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49 | (7) |
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3.4.1 Wax Thermodynamic Models Assuming Single Solid Phase |
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51 | (4) |
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3.4.2 Wax Thermodynamic Models Considering Multiple Solid Phases by Empirical Approaches: The Conoco and Lira-Galeana Models |
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55 | (1) |
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3.5 Coutinho's Thermodynamic Model-A Theoretically Comprehensive Thermodynamic Model |
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56 | (2) |
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3.6 Industrial Practice of Wax Thermodynamic Modeling |
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58 | (6) |
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3.6.1 Fluid Characterization: Preprocessing of Thermodynamic Modeling |
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58 | (5) |
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3.6.2 Model Tuning: Postprocessing of Thermodynamic Modeling |
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63 | (1) |
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3.7 Extended Applications of Wax Thermodynamic Models |
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64 | (2) |
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66 | (1) |
4 Wax Deposition Modeling |
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67 | (24) |
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4.1 Wax Deposition Mechanisms |
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67 | (2) |
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4.2 Molecular Diffusion as the Main Mechanism for Wax Deposition |
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69 | (4) |
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4.2.1 Step 1: Precipitation of Dissolved Wax Molecules |
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69 | (1) |
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4.2.2 Step 2: Formation of Radial Concentration Gradient of Dissolved Waxy Components |
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70 | (1) |
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4.2.3 Step 3: Deposition of Waxy Components on the Surface of an Existing Deposit |
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71 | (1) |
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4.2.4 Step 4: Internal Diffusion and Precipitation of Waxy Components in the Deposit |
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71 | (2) |
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4.3 Overview of Wax Deposition Modeling |
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73 | (3) |
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4.3.1 Wax Deposition Modeling Algorithm |
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73 | (1) |
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4.3.2 Overview of Various Wax Deposition Models |
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74 | (2) |
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4.3.2.1 Industrialized Commercial Wax Deposition Models |
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74 | (1) |
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4.3.2.2 Academic Wax Deposition Models |
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75 | (1) |
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4.4 Detailed Comparison of Different Wax Deposition Models |
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76 | (14) |
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76 | (1) |
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4.4.2 Hydrodynamics in the Wax Deposition Models |
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77 | (1) |
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4.4.3 Heat Transfer Equations and Correlations |
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78 | (2) |
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4.4.4 Mass Transfer and Deposit Growth Rate Calculations for the Wax Deposition Models |
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80 | (3) |
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4.4.4.1 Mathematical Representation of the Molecular Diffusion Mechanism |
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80 | (2) |
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4.4.4.2 Simplification of Wax Deposition Mechanisms |
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82 | (1) |
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4.4.5 Determining the Mass Flux |
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83 | (8) |
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4.4.5.1 Diffusion Coefficient of Wax in Oil, D wax |
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83 | (1) |
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4.4.5.2 Difference in the Concentration of Dissolved Waxy Components in the Bulk Oil and at the Wall, (Coil-Cwall) |
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84 | (2) |
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4.4.5.3 Thickness of the Mass Transfer Layer, δmass transfer |
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86 | (4) |
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90 | (1) |
5 Introduction to Wax Deposition Experiments |
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91 | (16) |
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5.1 Importance of Experimental Applications |
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91 | (1) |
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5.2 Wax Deposition Flow Loop |
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91 | (3) |
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5.2.1 Conditioning System and Pump System |
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91 | (2) |
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93 | (1) |
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5.3 Deposit Characterization |
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94 | (9) |
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5.3.1 Measurement of the Deposit Thickness |
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94 | (7) |
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5.3.1.1 Pressure-Drop Technique |
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94 | (3) |
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5.3.1.2 Weight Measurement Technique |
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97 | (1) |
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5.3.1.3 Heat Transfer Technique |
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97 | (3) |
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5.3.1.4 Liquid Displacement-Level Detection Technique |
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100 | (1) |
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5.3.1.5 Other Less Frequently Applied Techniques |
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100 | (1) |
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5.3.2 Composition Analysis of the Wax Deposit |
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101 | (2) |
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5.4 Cold-Finger Wax Deposition Apparatus |
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103 | (1) |
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5.5 Carrying Out Flow-Loop Wax Deposition Experiments |
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104 | (3) |
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5.5.1 Setup of Experimental Apparatus |
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104 | (1) |
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5.5.2 Oil Characterization |
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105 | (1) |
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5.5.3 Wax Deposition Tests |
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105 | (1) |
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5.5.4 Measurement of Deposit Thickness and Characterization of Wax Deposits |
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105 | (2) |
6 Applying Wax Deposition Models to Flow Loop Experiments |
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107 | (24) |
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107 | (1) |
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6.2 Uncertainties in Wax Deposition Modeling |
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107 | (3) |
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6.2.1 Characterizing the Wax Precipitation Curves |
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108 | (1) |
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6.2.2 Empirical Correlations for Transport Phenomena |
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108 | (1) |
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6.2.3 Uncertainties in Experimental Measurements |
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109 | (1) |
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6.2.4 Appropriate Methodology for Wax Deposition Benchmarking |
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109 | (1) |
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6.3 Applying Wax Deposition Models with Deposit Thickness |
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110 | (7) |
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6.3.1 Selecting Wax Deposition Experiments |
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110 | (4) |
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6.3.1.1 Experimental Facility |
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110 | (1) |
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110 | (1) |
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6.3.1.3 Experimental Conditions |
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111 | (3) |
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6.3.2 Summary of Model Performance |
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114 | (3) |
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6.4 Heat and Mass Transfer Analysis of the Wax Deposition Experiments |
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117 | (10) |
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6.4.1 Previous Wax Deposition Experiments on the Effect of Temperature |
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117 | (1) |
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6.4.2 Theoretical Analysis |
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118 | (4) |
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6.4.2.1 Dedimensionalizing the Transport Equations |
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118 | (2) |
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6.4.2.2 Characteristic Mass Flux of Wax Deposition |
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120 | (1) |
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6.4.2.3 Mass Transfer Driving Force |
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121 | (1) |
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6.4.3 Effect of the Operating Temperatures |
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122 | (9) |
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6.4.3.1 Analysis on the North Sea Condensate |
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122 | (1) |
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6.4.3.2 Analysis on Another Oil |
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123 | (2) |
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6.4.3.3 Importance of the Wax Precipitation Curve |
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125 | (1) |
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6.4.3.4 Carbon Number Distribution of the Oil |
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126 | (1) |
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6.5 Applying Wax Deposition Models to Investigate Deposit Compositions |
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127 | (2) |
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129 | (2) |
7 Applying Wax Deposition Models for Field Predictions |
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131 | (18) |
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131 | (3) |
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7.1.1 Wax Control Strategies for the Field |
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131 | (2) |
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7.1.2 Evaluating the Severity of Wax Deposition: The Ideal vs. the Reality |
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133 | (1) |
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7.2 Example 1-Single-Phase Pipe Flow |
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134 | (6) |
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134 | (1) |
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7.2.2 Wax Thermodynamic Characterizations |
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135 | (1) |
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7.2.3 Deposition Predictions and Pigging Frequency Design |
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136 | (4) |
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7.3 Example 2-Gas/Oil Flow |
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140 | (5) |
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140 | (1) |
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7.3.2 Wax Thermodynamic Characterization |
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141 | (2) |
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7.3.3 Deposition Predictions and Pigging Frequency Design |
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143 | (2) |
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145 | (1) |
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7.4.1 Wax Thermodynamic Characterizations |
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145 | (1) |
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7.4.2 Wax Deposition Modeling |
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146 | (1) |
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146 | (3) |
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7.5.1 Improving Field Characterization Techniques |
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147 | (1) |
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7.5.2 Collaboration between Industrial Partners |
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147 | (1) |
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7.5.3 Develop More Rigorous Wax Deposition Modeling for Multiphase Flow Conditions |
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147 | (2) |
Bibliography |
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149 | (10) |
Appendix A: Nomenclature |
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159 | (4) |
Index |
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163 | |