Directional Drilling, Horizontal & ML Wells (I)

 Date: TBA | Location: TBA

Course Duration: 1 Week

Course Content

• • • Basic petroleum geology
    • Rock types
    • Sedimentary rocks
    • Leak Off Tests in deviated wells
    • Casing Seat Selection

Planning and Engineering of Deviated Wells

• • • Geodetic and Co-ordinate systems
    • UTM and Lambert conical projections
    • Magnetic declination
    • Grid convergence
    • True North to Grid North corrections.

Target Definition and Geological Requirements

• • • Defining objectives and constraints
    • Trajectory optimisation
    • Contingency plans

Well Design Techniques

• • • Radius of curvature
    • Build and hold
    • Dog-Leg Severity considerations
    • KOP vs. Build rate
    • Kick Off Points, Build Up and Drop Off Rates
    • Wellpath Design Calculations, Tools
    • Designing horizontal wells:
    • kick off points, tangent and landing sections
    • Long-, Medium-, & Short-Radius Wells
    • Multi-lateral designs.
    • Joints integrity.
    • Landing horizontal wells
    • Exercises: Directional Well Profiles using Excel sheets

Drilling Deviated Wells- Tools Selection

        Rotary BHA design

• • • • Angle building assemblies
      • Angle holding assemblies
      • Angle dropping assemblies
      • Stabiliser types

        Steerable Mud Motors

• • • • Principles and design
      • Operating considerations & Limitations

          Rotary Steerable Systems

• • • • Principles and design
      • Operating considerations & Limitations

           MWD Systems

• • • • Principles and design
      • Measurements and data transmission
      • Operating considerations & Limitations

            LWD Systems

• • • • Principles and design
      • Measurements and data transmission
      • Operating considerations & Limitations

Directional Surveying

• • • Survey tools
    • Survey Reference
    • Calculations And Wellpath Plotting
    • Course Corrections

Drillstring Design

• • • Drillstring and BHA
    • Drill pipe, grades of drill pipe and strength properties
    • Drillcollars
    • Reamers and stabilizers
    • Thread types
    • Tool joints
    • Pressure-area method
    • Working load
    • Safety factors
    • WOB
    • Buckling
    • Assessment exercise

Torque and Drag Analysis

• • • Friction factors
    • Side force
    • Torsional stress
    • Axial loading
    • Critical buckling of drill string
    • Weight transfer
    • Neutral point location
    • Trajectory optimisation for T&D

Drilling Procedures for Deviated Wells

• • • Mud Design for ERD Wells
    • Hole Cleaning
    • Casing Design and Running in Wells
    • Running in and tripping out
    • Reaming and back-reaming
    • Optimisation of hydraulics / hole cleaning
    • Hole cleaning
    • Flow rates
    • Hi-Lo viscosity sweep
    • Warning signs of inadequate hole cleaning
    • Packing off

ERD Wells

• • • Bottomhole assemblies
    • Drillstring design for ERD
    • Tensile Loads
    • Torsional Loads
    • Buckling Considerations