| Description |
1 online resource |
| Contents |
AADE-11-NTCE -- 74, "High-Data-Rate MWD System for Very Deep Wells" significantly expanded with additional photographs and detailed annotations 11 1.2.1 Abstract 11 1.2.2 Introduction 11 1.2.3 MWD telemetry basics 13 1.2.4 New telemetry approach 14 1.2.5 New technology elements 16 1.2.5.1 Downhole source and signal optimization 16 1.2.5.2 Surface signal processing and noise removal 19 1.2.5.3 Pressure, |
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"finite-finite" waveguide of length 2L 91 3.1.5 Physical Interpretation 91 3.2 Variable area collar-pipe wave models 94 3.2.1 Mathematical formulation 94 3.2.2 Example calculations 96 3.3 References 98 4 Transient Constant Area Surface and Downhole Wave Models 99 Overview 99 4.1 Method 4-1. Upgoing wave reflection at solid boundary, single transducer deconvolution using delay equation, no mud pump noise 101 4.1.1 Physical problem 101 4.1.2 Theory 102 4.1.3 Run 1. Wide signal -- low data rate 103 4.1.4 Run 2. Narrow pulse width -- high data rate 105 4.1.5 Run 3. Phase-shift keying or PSK 106 4.1.6 Runs 4 and 5. Phase-shift keying or PSK, very high data rate 109 4.2 Method 4-2 |
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Upgoing wave reflection at solid boundary, single transducer deconvolution using delay equation, with mud pump noise 110 4.2.1 Physical problem 110 4.2.2 Software note 111 4.2.3 Theory 111 4.2.4 Run 1. 12 Hz PSK, plus pump noise with S/N = 0.25 112 4.2.5 Run 2. 24 Hz PSK, plus pump noise with S/N = 0.25 113 4.3 Method 4-3. Directional filtering -- difference equation method requiring two transducers 114 4.3.1 Physical problem 114 4.3.2 Theory 115 4.3.3 Run 1. Single narrow pulse, S/N = 1, approximately 116 4.3.4 Run 2. Very noisy environment 118 4.3.5 Run 3. Very, very noisy environment 119 4.3.6 Run 4. Very, very, very noisy environment 120 4.3.7 Run 5. Non-periodic background noise 121 4.4 Method 4-4. Directional filtering -- differential equation method requiring two transducers 122 4.4.1 Physical problem 122 4.4.2 Theory 123 4.4.3 Run 1 |
| Summary |
Trade magazines and review articles describe MWD in casual terms, e.g., positive versus negative pulsers, continuous wave systems, drilling channel noise and attenuation, in very simple terms absent of technical rigor. However, few truly scientific discussions are available on existing methods, let alone the advances necessary for high-data-rate telemetry. Without a strong foundation building on solid acoustic principles, rigorous mathematics, and of course, fast, inexpensive and efficient testing of mechanical designs, low data rates will impose unacceptable quality issues to real-time formation evaluation for years to come. The entire engineering history for continuous wave telemetry is covered: anecdotal stories and their fallacies, original hardware problems and their solutions, different noise mechanisms and their signal processing solutions, apparent paradoxes encountered in field tests and simple explanations to complicated questions, and so on, are discussed in complete "tell all" detail for students, research professors and professional engineers alike. These include signal processing algorithms, signal enhancement methods, and highly efficient "short" and "long wind tunnel" test methods, whose results can be dynamically re-scaled to real muds flowing at any speed |
| Bibliography |
Includes bibliographical references and index |
| Notes |
Online resource; title from PDF title page (Ebsco, viewed July 27, 2018) |
| Subject |
Oil well logging, Electric.
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Oil well drilling.
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Orientation -- Measurement
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Wells -- Fluid dynamics.
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Flow meters.
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Electric logging.
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flowmeters.
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TECHNOLOGY & ENGINEERING -- Mining.
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Electric logging
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Flow meters
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Oil well drilling
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Oil well logging, Electric
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Wells -- Fluid dynamics
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| Form |
Electronic book
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| ISBN |
9781119479307 |
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1119479304 |
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9781119479321 |
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1119479320 |
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9781119479369 |
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1119479363 |
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9781523123643 |
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1523123648 |
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