Drillstring Design

Steel And Submerged Tubulars

• Introduction - pre-class test

• Mechanical Properties of Steel & Basic Concepts- Strength & Deformation

• Hook’s Law - Minimum Yield Stress - Maximum Yield Stress

• Buoyancy - Axial Forces and Buckling in Submerged Tubulars

• Introduction to API RP7G for Drill Stem Design and Operating Limits - DP Elements 

On the first day participants will have an overview of the learning objectives during the course.  The day will continue on to discuss topics such as the properties of steel, Hooke's Law, and Thermal Stress. Participants will gain knowledge about axial forces and buckling in submerged tubulars, ending with a practical exercise.

Drill Stem Design, Drill Pipe Specifications and Connections

• Drillpipe Specs - Steel Grade – Tool Joints – Make-up Torque – Drillpipe Classification – Drillpipe Marking

• Drillstring Tension Design based on Margin of Overpull and SCF

• Collapse, Burst and Torsion Design

Participants will have a detail analysis of the complete manufacture of Drill Pipe process will be reviewed including conections and make up torque.  During the day multiple exercises will complement the theory part.

Bottom Hole Assembly and Drillstring Dynamics

• Bottom Hole Assembly (BHA) Selection and Design – Drill Collar and Heavy Weight Drill Pipe (HWDP) Specifications and properties – BHA Design Process

• Bending Strength Ratio – Stiffness Ratio – Stress Relief Features

• BHA Design for Directional Drilling Applications

• Drillstring Dynamics 

BHA components, properties, design factors and limitation including a BHA applicability in directional wells, stabilization principles and effects of stiffness, formation Dip, hole washout and WOB. The day will end with a review of drillstring dynamics.

Drill String Care and Inspection

• Drill String Failures and Prevention – Group 1 and Group 2 DS Failures

• Drill String Failure Prevention – Drill String Care and Inspection

• Standard DS-1 Overview

In the final day participants will learn about types of damage which may occur during operations and handling.  Detail review of tables, curves and technical data of DS-1 will be followed by fatigue design, overload cases and class exercises.