Formation testing : low mobility pressure transient analysis

314 Pages·2016·10.412 MB·English

by  Chin, Wilson C., Feng, Yongren, Yu, Qiang, Zhou, Yanmin

Formation Testing
Scrivener Publishing
100 Cummings Center, Suite 541J
Beverly, MA 01915-6106
Publishers at Scrivener
Martin Scrivener([email protected])
Phillip Carmical ([email protected])
Formation Testing
Low Mobility Pressure Transient
Analysis
Wilson C. Chin , Ph.D., M.I.T.
Stratamagnetic Soft ware, LLC, Houston
and
Yanmin Zhou, Yongren Feng and Qiang Yu
China Oilfi eld Services LTD, Beijing
Copyright © 2016 by Scrivener Publishing LLC. All rights reserved.
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Cover design by Kris Hackerott
Library of Congr ess Cataloging-in-Publication Data:
ISBN 978-1-118-92594-2
Printed in the United States of America
10 9 8 7 6 5 4 3 2 1
Contents
Preface xi
Acknowledgements xiii
1 Basic Ideas, Interpretation Issues and Modeling Hierarchies 1
1.1 Background and Approaches 1
1.2 Modeling Hierarchies 5
1.3 Experimental Methods and Tool Calibration 13
1.4 References 24
2 Single-Phase Flow Forward and Inverse Algorithms 25
2.1 Overview 25
2.2 Basic Model Summaries 27
2.2.1 Module FT-00 28
2.2.2 Module FT-01 30
2.2.3 Module FT-03 30
2.2.4 Forward Model Application, Module FT-00 31
2.2.5 Inverse Model Application, Module FT-01 33
2.2.6 Eff ects of Dip Angle 35
2.2.7 Inverse “Pulse Interaction” Approach
Using FT-00 37
2.2.8 Computational Notes 40
2.2.9 Source Model Limitations and More
Complete Model 41
2.2.10 Phase Delay Analysis, Module FT-04 43
2.2.11 Drawdown-Buildup, Module FT-PTA-DDBU 45
2.2.12 Real Pumping, Module FT-06 48
2.2.13 Closing Remarks 50
2.2.14 References 50
v
vi Contents
3 Advanced Drawdown and Buildup Interpretation
in Low MobilityEnvironments 51
3.1 Basic Steady Flow Model 51
3.2 Transient Spherical Flow Models 53
3.2.1 Forward or Direct Analysis 53
3.2.2 Dimensionless Formulation 54
3.2.3 Exact Solutions for Direct Problem 55
3.2.4 Special Limit Solutions 56
3.2.5 New Inverse Approach for Mobility and
Pore Pressure Prediction 58
3.3 Multiple-Drawdown Pressure Analysis (Patent Pending) 59
3.3.1 Background on Existing Models 59
3.3.2 Extension to Anisotropic, No-Skin Applications 60
3.3.2.1 Method 1 - Drawdown-Alone Test 61
3.3.2.2 Method 2 - Single-Drawdown-
Single-Buildup Test 62
3.3.2.3 Method 3 - Double-Drawdown-
Single-Buildup Test 62
3.4 Forward Analysis with Illustrative Calibration 64
3.5 Mobility and Pore Pressure Using First Drawdown Data 66
3.5.1 Run No. 1, Flowline Volume 200 Cc 66
3.5.2 Run No. 2, Flowline Volume 500 Cc 69
3.5.3 Run No. 3, Flowline Volume 1,000 Cc 71
3.5.4 Run No. 4, Flowline Volume 2,000 Cc 73
3.6 Mobility and Pore Pressure from Last Buildup Data 74
3.6.1 Run No. 5, Flowline Volume 200 Cc 74
3.6.2 Run No. 6, Flowline Volume 500 Cc 76
3.6.3 Run No. 7, Flowline Volume 1,000 Cc 77
3.6.4 Run No. 8, Flowline Volume 2,000 Cc 78
3.6.5 Run No. 9, Time-Varying Flowline Volume 79
3.7 Tool Calibration in Low Mobility Applications 81
3.7.1 Steady Flow Model 81
3.7.2 Example 1, Calibration Using Early-Time
Buildup Data 81
3.7.3 Example 2, Calibration Using Early-Time
Buildup Data 86
3.7.4 Example 3, Example 1 Using Drawdown Data 89
3.7.5 Example 4, Example 2 Using Drawdown Data 91
3.8 Closing Remarks 93
3.9 References 94
Contents vii
4 Phase Delay and Amplitude Attenuation for Mobility
Prediction in Anisotropic Media with Dip (Patent Pending) 95
4.1 Basic Mathematical Results 96
4.1.1 Isotropic Model 96
4.1.2 Anisotropic Equations 98
4.1.3 Vertical Well Solution 99
4.1.4 Horizontal Well Solution 100
4.1.5 Formulas for Vertical and Horizontal Wells 101
4.1.6 Deviated Well Equations 101
4.1.7 Deviated Well Interpretation for Both K and K 103
h v
4.1.8 Two-Observation-Probe Models 105
4.2 Numerical Examples and Typical Results 107
4.2.1 Example 1, Parameter Estimates 108
4.2.2 Example 2, Surface Plots 109
4.2.3 Example 3, Sinusoidal Excitation 110
4.2.4 Example 4, Rectangular Wave Excitation 113
4.2.5 Example 5, Permeability Prediction at
General Dip Angles 115
4.2.6 Example 6, Solution for a Random Input 117
4.3 Layered Model Formulation 118
4.3.1 Homogeneous Medium, Basic Mathematical Ideas 118
4.3.2 Boundary Value Problem for Complex Pressure 120
4.3.3 Iiterative Numerical Solution to
General Formulation 120
4.3.4 Successive Line Over Relaxation Procedure 121
4.3.5 Advantages of the Scheme 122
4.3.6 Extensions to Multiple Layers 122
4.3.7 Extensions to Complete Formation Heterogeneity 123
4.4 Phase Delay Soft ware Interface 123
4.4.1 Output File Notes 126
4.4.2 Special User Features 126
4.5 Detailed Phase Delay Results in Layered
Anisotropic Media 127
4.6 Typical Experimental Results 134
4.7 Closing Remarks - Extensions and Additional
Applications 138
4.8 References 139
5 Four Permeability Prediction Methods 140
5.1 Steady-State Drawdown Example 142
5.2 Early-Time, Low-Mobility Drawdown-Buildup 144
viii Contents
5.3 Early-Time, Low-Mobility Drawdown Approach 147
5.4 Phase Delay, Non-Ideal Rectangular Flow Excitation 148
6 Multiphase Flow with Inertial Eff ects 151
6.1 Physical Problem Description 152
6.1.1 Th e Physical Problem 152
6.1.2 Job Planning Considerations 154
6.1.3 Modeling Challenges 155
6.1.4 Simulation Objectives 156
6.1.5 Modeling Overview 157
6.2 Immiscible Flow Formulation 159
6.2.1 Finite Diff erence Solution 160
6.2.2 Formation Tester Application 161
6.2.3 Mudcake Growth and Formation Coupling
at Sandface 163
6.2.4 Pumpout Model for Single-Probe Pad Nozzles 165
6.2.5 Dual Probe and Packer Surface Logic 166
6.3 Miscible Flow Formulation 168
6.4 Inertial Eff ects With Forchheimer Corrections 169
6.4.1 Governing Diff erential Equations 169
6.4.2 Pumpout Boundary Condition 171
6.4.3 Boundary Value Problem Summary 172
6.5 References 173
7 Multiphase Flow - Miscible Mixing Clean-Up Examples 175
7.1 Overview Capabilities 175
7.1.1 Example 1, Single Probe, Infi nite
Anisotropic Media 176
7.1.2 Example 2, Single Probe, Th ree Layer Medium 181
7.1.3 Example 3, Dual Probe Pumping, Th ree
Layer Medium 183
7.1.4 Example 4, Straddle Packer Pumping 185
7.1.5 Example 5, Formation Fluid Viscosity Imaging 187
7.1.6 Example 6, Contamination Modeling 188
7.1.7 Example 7, Multi-Rate Pumping Simulation 189
7.2 Source Code and User Interface Improvements 191
7.2.1 User Data Input Panel 191
7.2.2 Source Code Engine Changes 193
7.2.3 Output Color Graphics 195