Borehole_Environment

Borehole_Environment - Lecture Presentation Fundamentals of...

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Lecture Presentation Fundamentals of Well Logging The Borehole Environment Carlos Torres-Verdín, Ph.D. Professor Department of Petroleum and Geosystems Engineering The University of Texas at Austin Objectives: 1. To introduce the concept of mud- filtrate invasion in overbalanced boreholes, 2. To introduce basic terminology, symbols, and definitions concerning the borehole environment, and 3. To describe the physical principles necessary to understand the impact of mud-filtrate invasion on well logs.
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Why Mud? Where do well logs come from? Resistivity Gamma Ray Density Porosity Logging Tool
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Uninvaded shale, R shtop Uninvaded shale, R shbot R xo1 R xon R xo2 R t1 R t2 R tn R xon-1 R tn-1 · · · r z Uninvaded shale, R shtop Uninvaded shale, R shbot Layer 1 Layer 2 Layer n Layer n-1 · · · r xo1 r xon r xo2 r xon-1 · · · R t1 R t2 R tn R tn-1 Resistivity Depth Time of Invasion (days) 5 Fluid aaturation is variable in the radial direction: common 2D problem (invasion and shoulder effects) Effects of Mud Filtrate Invasion on Well Logs PORE-SCALE EXAMPLE OF DRILLING DAMAGE (Before and After) Photographs Courtesy of Robert Terry, BP
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Composition of Drilling Muds Liquids + Solids in Suspension Types of Muds 1.Water-Base Muds 2.Oil-Base Muds 3.Synthetic Muds MUD FLUIDS SOLIDS Particle-Size Distribution of Drilling Muds WATER-BASE MUD WITH BARITE
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Standard Filter Press Mud-Filtrate Invasion Experiment
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THE INTERPLAY OF MUD PARTICLE SIZE AND FORMATION THROAT SIZE MUD CIRCULATION BOREHOLE WALL MUD PORE-SCALE EXAMPLE OF MUDCAKE BUILDUP (Oil-Base Mud)
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This note was uploaded on 01/30/2011 for the course PGE 323K taught by Professor Lake during the Spring '08 term at University of Texas.

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Borehole_Environment - Lecture Presentation Fundamentals of...

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