the biggest collection of oil well drilling books such as Drilling bits, Drilling Fluids, and Casing, links updated from time to time, all you have to do is to click on the icon under the required book name:
Casing Dimensions, Materials and Strength
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Drill Bit Technology
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Drilling Fluids Part.1
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Introduction to Directional Drilling
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Well head Components
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BOPE - Description and Selection
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Casing Heads
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Coordinates Systems
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Drill Bits Hydraulics Calculations
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Drilling Fluids
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Principles of Rheology
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SLP Well Coordinates and Directions
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Bit Hydraulics Optimization
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BOPE - Testing Procedures
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Survey Calculations
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Surveying Tools 1
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Surveying Tools 2
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Bottom hole Assemblies
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Down hole Motors
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Rotary Steerable Systems
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Cementing Flashs
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MWD and LWD systems
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Operation of Downhole Motor
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Side Track Procedures
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MWD and LWD Measurement Tables
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Shocks and Vibrations
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Anti Collision
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Well Design Fundamentals
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Basic Maths of Well Planning
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Drilling Manual Planning
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Well Cementing Part.1
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Well Cementing Part.2
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Horizontal Directional Drilling Guidelines
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well-control-methods
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Drilling Calculations part.1
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Drilling Calculations part.2
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Technical Data Book for Well Control
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Pressure Control During Oil Well Drilling
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Wellhead Safety
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Acidizing
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Well Control Equations
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Modern Well Analysis
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LWD and MWD
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Drilling preliminaries
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Drilling Handbook
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Subsurface Safety Equipment 
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