The Drilling/Workover course builds on the fundamental aspects of well control for drilling and workover operations with a focus on well kill operations for surface stacks only.

4.5 Days

Mode Type Level Course Length
In-Person Well Control Courses IADC Drilling Supervisor 4.5 Days

WellSharp Drilling & Workover

The Drilling/Workover course builds on the fundamental aspects of well control for drilling and workover operations with a focus on well kill operations for surface stacks only.

Workover Course Outline IADC WellCAP

Interactive Tools

  • Provide students with over 600 pages of pre-course study
    materials at wildwell.com
  • Provide students with a study guide that covers up to 150 interactive well control questions and answers.
  • Provide students with a 50 question test to determine their well control knowledge gaps.

Preliminary Items

  • Safety: escape routes, muster points, etc.
  • Discussion of special needs
  • Introductions
  • Class paperwork

Serious Well Control Problem From the Wild Well Library

  • Students form teams
  • Team discussion of the potential well control problem
  • Simulator exercise demonstrating the well control challenge
  • Return to class to discuss the challenge

Well Control Course Objectives

  • Formations, pore pressure, fracture gradients
  • Killsheet, kick detection, flow checks, well shut-in, and gas behavior
  • Well control methods
  • Well control equipment (barriers, BOPs, manifolds, accumulator, etc.)
  • Completing the well and post-completion activity
  • Final well control simulation: from a kick to kill, with complication
  • Assessments: skills and written

Formations, Pore Pressure, and Fracture Gradient

  • Formation structure
    − Porosity
    − Permeability
  • Fracture gradients, kick tolerance, pore pressures
    − Related formulas/math (hydrostatic pressure, the U tube, force,
    MAASP, etc.)
    − Equivalent mud weight
    − Kick tolerance
    − Pore pressure vs. fracture gradient (drilling margin/window)
  • Simulator exercise demonstrating a FIT; discussion of LOT (if needed, depending upon class knowledge level)
  • Discuss casing and cementing program
  • Discuss drilling fluids program


  • Philosophy and operation of barrier systems
  • Number of barriers for safe operation
  • Testing barriers

Shallow Gas, Water Flows, and Top-Hole Drilling

  • Definitions and causes of pressure in top-hole formations
  • Causes of underbalanced top-hole
  • Diverting practices
  • Top-hole drilling practices and causes of kicks

Abnormal Pressure Warning Signs

  • Abnormal pressure
  • Shaker evidence
  • Changes in mud properties
  • Changes in drilling data/parameters

Killsheet, Kickc Detection, Flow Checks, Well Shut-In, and Gas Behavior

  • Related formulas/math (capacities/volumes, strokes,
    circulation times, etc.)
  • Causes of kicks
  • Kick signs
    − Overt kick signs
    − Pre-kick signs
  • Flow-check procedures
  • Shut-in procedures
    − Hard shut-in
    − Soft shut-in
    − Shut-in challenges
  • Paper killsheet with preliminary well data
    − Well data, volume calculations
    − Discuss the importance of a killsheet
  • Simulator exercises demonstrating hard and soft shut-in
    − Kick detection and shut-in
    − Students complete killsheet with simulator well data (or instructor-given data)
    − Discussion of killsheet calculations:
    − What do they mean? (if needed) Discussion of IADC WellSharp
    rounding rules
  • Gas behavior
    − While drilling
    − In horizontal wells
    − While shut-in

Well Control Methods

  • Review of related formulas/math (capacities/volumes, strokes, circulation times, kill mud, MAASP, ICP, FCP, etc.)
  • Wait and Weight Method
    − Discussion of Wait and Weight
    − Techniques
    − Skills (pump startup, step-down chart, gauge use, lag time, etc.)
    − Simulator exercise
  • Driller’s Method
    − Discussion of Driller’s Method
    − Techniques
    − Skills (pump startup, capturing pressure after the first circulation,
    lag time, etc.)
    − Simulator exercise
  • Volumetric and Lube and Bleed
    − Discussion of Volumetric Method
    − Formulas
    − Understanding the process and technique
    − Skills (use of electronic killsheet or paper graph, managing gas
    − Simulator exercise
    − Discussion of Lube and Bleed

Stripping Pipe Under Pressure

  • Discussion of technique
  • Skills (annular pressure, speed of strip, managing wellbore pressures via volumetric method)
  • Simulator exercise

Bullhead Methods: Discussion & Simulator Exercise (if time allows)
Discussion of study guide questions

Well Control Drills

  • Pit drills
  • Trip drills
  • Stripping drills
  • Choke drills
  • Early response and empowerment to act

Completing the Well and Post-Completion Activity: a short discussion

  • Completions
  • Differences between drilling and workover

Final Simulator Exercise (if time allows)

  • Abnormal lateral well and kick detection
  • Kill the well with Wait and Weight Method


  • Ballooning wells vs. kicking wells
  • FingerprintingTension

Discussion of Study Guide & Questions
Skills Assessment

Learning objectives

  • Operations
  • Barriers
  • Bullhead Method
  • Complications
  • Reverse Circulation Method
  • Unconventional well control
  • Lube and Bleed Method


  • Completion design
    − Reservoir considerations
    − Production methods
  • Workover operations
    − Drilling vs. workover well control considerations
    − Equipment considerations


  • Fluids
  • Mechanical

Bullhead Method

  • Calculations
    − Kill fluid
    − Volumes
    − Pressure considerations
  • Graphing a bullhead method
  • Bullhead simulation exercise
  • Bullhead method killsheet
  • Bullhead simulation exercise with a killsheet


  • Surface
  • Downhole
  • Bullhead complications simulation

Reverse Circulation Method

  • Effects of friction
  • Complications
  • Reverse Circulation simulation

Unconventional Well Control

  • Pill and Kill
  • Top kill
  • Rolling the Hole
  • Volumetric Method

Lube and Bleed Method

  • Discussion of the process
  • Lube and Bleed simulation

Computer-Based WellSharp Exam