Directional Drilling, Horizontal & ML Wells (3)

Date: 28th October - 1st November-2024 | Location: London

Course Duration: 2 Weeks 

Geological Concepts

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

Reasons For Drilling Deviated Wells

• • Side-tracking existing wells (fish or geological problems)
  • Restricted surface locations
  • Multiple targets
  • Offshore multi-well platforms
  • Environmental footprint
  • Salt dome drilling
  • Geological requirements
  • Thin reservoirs
  • Gas or water coning problems
  • Intersecting fractures
  • Re-entering existing wells

Planning and Engineering 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

Drillstring Design

• • Drillstring and BHA
  • Drill pipe, grades of drill pipe and strength properties
  • Drillcollars
  • Reamers and stabilizers
  • Thread types
  • Tool joints
  • Assessment exercise
  • Calculations of approximate weight of drill pipe and tool joint
  • Drill collar weight and neutral point
  • Bending strength ratio
  • Margin of over-pull
  • Slip crushing
  • Pressure-area method
  • Jars
  • Jars and accelerators – How they work
  • Mechanical Jars
  • Hydraulic jars
  • Hydro-mechanical jars
  • Fishing jars
  • Accelerators
  • Jar Calculations
  • Shock subs
  • 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
  • Excel exercise using actual well data

Drilling Procedures For Deviated Wells

• • Mud Design for ERD Wells
  • Hole Cleaning
  • Casing Design and Running in ERD 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

Directional Surveying

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

Anti-collision Analysis

• • Ellipsoid of uncertainty calculations
  • 3-dimensional proximity analysis
  • Collision avoidance
  • Spider plots
  • Travelling cylinder plots 

Reservoir Aspects of Horizontal Wells

• • Drainage area
  • Concepts of Steady State and Pseudo- Steady State
  • Productivity index
  • Determining number of horizontal wells required per drainage area
  • Impact of Anisotropy
  • Effect of Length and Anisotropy on Productivity Index
  • Well exercise

ERD Wells

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

Wellpath Design Calculations

• • Kick Off Points
  • Build Up and Drop Off Rates
  • Rotary Steerable Systems
  • Weight on-bit considerations

Wellbore Stability in Deviated Wells

• • Tensile and shear failure mechanisms
  • Mohr’s Envelope
  • Optimum azimuth for deviated wells
  • Maximum safe mud weight envelope

Hole Problems in Deviated Wells

• • First actions – Primary freeing methods
  • When stuck by solids or pack off
  • When stuck differentially
  • When stuck other than solids or differential
  • Assessment exercise
  • Secondary Freeing methods
  • Pills
  • U-tubing
  • Back off and fish
  • Free point