Topic outline

  • Underbalanced Drilling

    This course covers systematic techniques on underbalanced drilling for drilling, petroleum and reservoir managers, superintendents, supervisors, engineers, foremen and technical field staff
    • Training Methodology & Objectives

      Training Methodology

      This Trainee-centered course includes the following training methodologies:-

      • Talking presentation Slides (PPT with audio)
      • Simulation & Animation
      • Exercises
      • Videos
      • Case Studies
      • Gamification (learning through games)
      • Quizzes, Pre-test & Post-test

      Course Objectives

      After completing the course, the employee will:-

      Apply and gain an in-depth knowledge on underbalanced drilling Discuss underbalanced drilling technology, wellsite underbalanced drilling equipment and underbalanced drilling applications
      Identify the regulatory barriers to underbalanced drilling and the reasons for underbalanced growth Carryout completion techniques and recognize the effect of skin on production rates and the various types of flow regimes
      Interpret closed loop circulation system, choke manifold, improved hole cleaning, foam drilling benefits and the common drilling problems associated with underbalanced drilling Apply drilling fluid selection, operating procedures, general classifications of air drilling techniques and detection of low pressure bearing zones
      Minimize formation damage and discuss the mechanics of air drilling, other disadvantages to of air drilling, bit performance, equipment required for air drilling and air requirements Describe aeration procedure, downhole fires & explosion, low density fluids, aerated drilling fluids and the common mud products used
      Determine recommended equipment, air drilling equipment, equipment layout, flaring from choke manifold, dusting and volume requirements Explain underbalance drilling benefits, effect of pressure differential, penetration rate and the effect of underbalanced drilling on cutting structure of roller cone bits
      Improve formation evaluation, reduce formation damage and recognize temporary overbalanced, spontaneous inhibition, gravity-induced invasion and wellbore glazing Identify post-drilling damage, mechanical degradation, environmental benefits and volume requirements
      • Course Description

        During the past decade, operators have steadily increased the use of underbalanced drilling (UBD) because of its many advantages. Traditional UBD methods included using air to increase the drilling rate, using aerated mud to reduce lost circulation, and using foam to clean sand from wells.
        Underbalanced drilling (UBD) is the practice of drilling a well with the wellbore fluid gradient less than the natural formation gradient. It differs from conventional drilling in that the bottomhole circulating pressure is lower than the formation pressure, thereby permitting the well to flow while drilling proceeds
        As reservoir pressures decline, underbalanced drilling and workovers become an important reservoir protection procedure. So, a new wave of technological advances has propelled UBD from its traditional applications to a wider range of situations, which also heightens its value. With the advent of horizontal drilling, UBD became important in avoiding differential sticking and protecting the reservoir from damage. The continued development of flow drilling, gaseated systems, foams, engineering equations, and better surface-control systems has made UBD a standard tool, instead of a special application
        This E-Learning course is designed to provide participants with a detailed and up-to-date overview of underbalanced drilling. It covers the underbalanced drilling technology, wellsite underbalanced drilling equipment and underbalanced drilling applications; the regulatory barriers to underbalanced drilling and the reasons for underbalanced growth; the completion techniques and the effect of skin on production rates and the various types of flow regimes; the closed loop circulation system, choke manifold, improved hole cleaning, foam drilling benefits and the common drilling problems associated with underbalanced drilling; the drilling fluid selection, operating procedures, general classifications of air drilling techniques and detection of low pressure bearing zones; and the mechanics of air drilling, other disadvantages to of air drilling, bit performance, equipment required for air drilling and air requirements
        During this course, participants will learn the aeration procedure, downhole fires & explosion, low density fluids, aerated drilling fluids and the common mud products used; the recommended equipment, air drilling equipment, equipment layout, flaring from choke manifold, dusting and volume requirements; the underbalance drilling benefits, effect of pressure differential, penetration rate and the effect of underbalanced drilling on cutting structure of roller cone bits; the formation evaluation, formation damage and temporary overbalanced, spontaneous inhibition, gravity-induced invasion and wellbore glazing; and the post-drilling damage, mechanical degradation, environmental benefits and volume requirements
        • Module 1 - Module 1 Introduction to Underbalanced Drilling Technology

          Contents:
            • What is UBD
            • Additional Definitions
            • Why Drill Underbalanced?
            • Historical Perspectives
            • Wellsite UBD Equipment
            • UB Drilling - Jobs
            • Under-balanced Drilling in the United States
            • Underbalanced Drilling - Wells by Region
            • Formation Pressure is Equal to or Greater Than Circulating Pressure
            • UBD Applications
            • Barriers to UB Drilling
            • Regulatory Barriers to Underbalanced Drilling
            • Barriers To UB
            • Operators Barriers
            • Operators Problems
            • Reasons For UB Growth
            • Technical Improvements
            • Working On
            • Completion Techniques
            • Reasons for UB Drilling
            • Effect of Skin on Production Rates
            • Physical Limits to UB Drilling
            • Physical Limitation to UBD
            • Production Limits to UBD
            • Types of Flow Regimes
            • Fluid Phase Continuity
            • Generalized “Fluid” Systems
            • Control Equipment
            • Rotating BOP
            • Closed Loop Circulation System
            • Choke Manifold
            • Equipment
            • Equipment - Gas Source
            • Equipment - Lots More
            • Air Drilling
            • Air Drilling Dusting
            • Air Drilling Benefits
            • Air (Dust) Drilling Layout
            • Air Drilling Waited upon Large Portable Compression
            • Misting
            • Foam Drilling (Drilling Basic Components)
            • Foam Drilling
            • Improved Hole Cleaning
            • Foam Drilling Benefits
            • Mist or Foam Drilling Layout
            • Gaseated or Aerated Drilling
            • Aerated Fluid
            • Parasite String
            • Jet Sub
            • Parallel Casing String
            • Aerated Fluid Drilling Layout
            • Common Drilling Problems Associated with UBD
            • Drilling Fluid Selection
            • Atmospheric Surface System for Flow Drilling
            • Surface Equipment
            • Rotating Blowout Preventer (RBOP)
            • RBOP Sealing Elements
            • A Typical Flowdrilling Choke Manifold
            • Surface Pits
            • Operating Procedures
            • Mudcap Drilling
            • An Example of Mudcap Drilling
            • Schematic of Equipment Required for Mudcap Drilling
            • Snub Drilling
            • Closed Systems
            • A Typical, Horizontal, Four-phase Separator, for Underbalance Drilling
            • Other Surface Equipment
            • Electromagnetic MWD Tools
            • Factors Leading to Increased UBD
            • Closed Loop System
            • Prevent Formation Damage
            • A Typical Closed Surface System
            • Flow Control Arrangement
            • Module Quiz
          • Module 2 - Air UB Drilling

            Contents:
              • Air Drilling Techniques
              • Bit Performance
              • Detection of Low Pressure Bearing Zones
              • Drilling Through Loss or Production Zones
              • Low Mud Material Cost
              • Minimize Formation Damage
              • "Dust" Drilling
              • Hole Cleaning
              • Particle Dynamics
              • Erosion
              • Corrosion Control
              • Mud vs Air
              • Mud Operation
              • Air Operation
              • Mud Mist Drilling
              • Hole Cleaning
              • Corrosion Control
              • Mechanics of Air Drilling
              • Bit Performance
              • Equipment Required for Air Drilling
              • Air Requirements
              • Unloading and Drying the Hole
              • Downhole Problems
              • Downhole Fires and Explosions
              • Video: Underbalanced Drilling Air Drilling
              • Module Quiz
            • Module 3 - Low Density Fluids

              Contents:
                • Definitions
                • Advantages of Air
                • Disadvantages
                • Air Drilling
                • Video: Air Drilling Rig
                • Aerated drilling fluids
                • Advantages of Aerated Drilling Fluids
                • Use of Aerated Fluids
                • Stable Foam
                • States of Aggregation of Phases
                • Stiff Foam
                • Preformed Stable Foam
                • Mist
                • Rheological Properties of Foams
                • Module Quiz
              • Module 4 - Stiff FOAM DRLG

                Contents:
                  • Stiff Foam Drilling
                  • When to use Stiff Foam Drilling
                  • Advantages
                  • Mixing Procedures
                  • Suggestions
                  • Procedures
                  • Recommended Equipment
                  • Video: What Are Common Mistakes to Avoid in Foam Drilling?
                  • Module Quiz
                • Module 5 - Underbalanced Directional Drilling

                  Contents:
                    • Downhole Fire
                    • Air Drilling Equipment
                    • Equipment Layout
                    • Blooie Line
                    • Flaring From Choke Manifold
                    • Dusting
                    • Blowout Preventer
                    • Drilling with a Flare
                    • Downhole Equipment
                    • Volume Requirements
                    • Foam Drilling
                    • Foam
                    • Gasified Liquids
                    • Flowdrilling
                    • Closed System
                    • Video: Underbalanced Directional Drilling
                    • Module Quiz
                  • Module 6 - Underbalance DRLG Advantages & Benefits

                    Contents:
                      • Benefits of Underbalanced Drilling
                      • Increased Penetration Rate
                      • Chip Hold Down Effect
                      • Effect of Pressure Differential
                      • Gas Drilling vs. Mud Drilling
                      • Penetration Rate as a Function of the Differential Pressure
                      • Field Example Switching From Air To Mud
                      • Increased Bit Life or Use Less No of bits?
                      • Effect of UBD on Cutting Structure of Roller Cone Bits
                      • Reduced Differential Sticking
                      • Minimized Lost Circulation
                      • Improved Formation Evaluation
                      • Reduces Formation Damage
                      • Formation Damage Mechanisms During Drilling (Overbalanced)
                      • Temporary Overbalance
                      • Spontaneous Imbibition
                      • Gravity-induced invasion
                      • Wellbore glazing
                      • Post-Drilling Damage
                      • Mechanical Degradation
                      • Earlier Production
                      • Environmental Benefits
                      • Less Need for Stimulation
                    • Module 7 - Underbalance DRLG Examples

                      Contents:
                        • Volume Requirements
                        • Example Problems
                        • Gas Volume Correlations
                        • Deviated Hole
                      • Post-Test

                        Kindly complete the post-test to assess your knowledge about the topic after the course.