Advanced Drill String Design


The purpose of this course is to reduce the probability of drill stem failures in operations. To accomplish this goal, the course summarizes drill stem and gives recommended inspection procedures. The course covers to moderate practices angle well bores, extended reach and horizontal drilling. Loads simple drill stem design for vertical applied by tension, combined torsion, burst pressure, collapse pressure, compression, slip and stability forces are considered. Design steps to reduce fatigue damage are also covered.


    • Design assumptions
    • Design objectives
    • Fatigue
    • Design factors
    • Vertical to moderate angles well bores
    • Choosing drill collar size, connection and connection features.
    • Determining torsional strength of drill collar connections.
    • Determining minimum lengths of drill collars and HWDP section.
    • Checking slip crushing forces.
    • Calculating allowable and working tension loads.
    • Calculating maximum permissible length of each drill pipe section.
    • Extended reach well bores:
    • Load predication.
    • Load analysis
    • Jar placement.
    • Fatigue mitigation and buckling.
    • Build and hold well bores
    • Bucking initiation paints low tangent paint
    • Buckling above kickoff point below buckling below tangent point
    • Stabilizers in high angle hole
    • Jar placement
    • Dropping wellbores
    • How drill stem fail
    • Drill pipe failure prevention plan
    • Drill pipe tube fatigue failure
    • BHA connections fatigue failure
    • BHA connection stress relief I BSR
    • Drill crew five second checks
    • Drill string care and handling practices Lunch
    • Basic jar operations
    • Pump open force
    • Cocking/ tripping the jar
    • Drilling accelerator
    • Jar rules I placement guide line
    • Down hole equipment failure
    • Tool failure causes
    • Factors influence tool selection
    • Rig site tool selection / inspection
    • Inspection methods
    • Standard inspection programs Visual tube inspection

    Who Can Benefit?

    Drilling engineers, drilling supervisors, senior engineers and team drilling engineering's/ operations.