Well Control

This page contains well control contents in this site.


Basic Calculation Related to Well Control

Adjusted maximum allowable shut-in casing pressure
Brine weight with temperature correction
Calculate Annular Capacity
Calculate Annular Pressure Loss
Calculate Equivalent Circulation Density (ECD) with complex engineering equations
Calculate Influx Height
Calculate inner capacity of open hole/inside cylindrical objects
Calculate Pressure Gradient and Convert Pressure Gradient
Calculate Specific Gravity (SG) in oilfield unit
Convert Pressure into Equivalent Mud Weight
Convert specific gravity to mud weight (ppg and lb/ft3) and pressure gradient (psi/ft)
Corrected D Exponent Calculation
D Exponent Calculation
Determine height of light weight spot pill to balance formation pressure
Determine the actual gas migration rate
Drill pipe pulled to lose hydrostatic pressure
Equivalent Circulating Density (ECD) in ppg
Equivalent Circulating Density (ECD) Using Yield Point for MW less than 13 ppg
Equivalent Circulating Density (ECD) Using Yield Point for MW More than 13 ppg
Estimate gas migration rate in a shut in well
Estimate Type of Influx (kick)
Formation Integrity Test (FIT) Procedure and Calculation
Formation Pressure from Kick Analysis
How does the 0.052 constant come from?
Hydraulic Horse Power (HPP) Calculation
Hydrostatic Pressure (HP) Decrease When POOH
Hydrostatic Pressure Calculation
Hydrostatic Pressure Loss Due to Gas Cut Mud
Kick Tolerance Calculation
Kill Weight Mud
Leak Off Test (Procedures and Calcuation)
Loss of Hydrostatic Pressure due to Lost Return
Maximum pit gain from gas kick in water based mud
Maximum Surface Pressure from Gas Influx in Water Based Mud
Pipe Displacement Calculation
Pump Output Calculation for Duplex Pump and Triplex Pump
Pump pressure and pump stroke relationship
Temperature Conversion Formulas

Drilling Mud Calculation (Related to Well Control)

Determine the density of oil and water mixture
Increase mud weight by adding barite
Increase Mud Weight by Adding Calcium Carbonate
Increase Mud Weight by Adding Hematite
Mixing Fluids of Different Densities with Pit Space Limitation
Mixing Fluids of Different Densities with Pit Space Limitation
Reduce mud weight by dilution
Starting volume of original mud (weight up with Barite)
Starting volume of original mud (weight up with Calcium Carbonate)
Starting volume of original mud (weight up with Hematite)
Volume of mud in bbl increase due to adding barite
Volume of Mud Increases due to Adding Calcium Carbonate
Volume of Mud Increases due to Adding Hematite

Slug Calculations

Barrels of slug required for desired length of dry pipe
Weight of slug required for desired length of dry pipe with set volume of slug

Basic Knowledge Relating To Well Control

Abnormal Pressure Caused By Faulting
Abnormal Pressure from Anticline Gas Cap
Accumulator Capacity – Usable Volume per Bottle Calculation (Surface Stack)
Accumulator Capacity – Usable Volume per Bottle Calculation for Subsea BOP
Blowout – Oilfield Disaster That You Need to See
Bottom Hole Pressure Relationship
Bottom Hole Pressure with Constant Surface Pressure
Boyle’s Gas Law and Its Application in Drilling
Casing Shoe Pressure While Circulating Influx in Well Control Situation
Causes of Kick (Wellbore Influx)
Cement Transition Period in The Oil Well Can Cause Well Control Situation
Difference between True Vertical Depth (TVD) and Measured Depth (MD)
Effect of Frictional Pressure on ECD while forward circulation
Effect of Frictional Pressure on ECD while reverse circulation
Estimated mud weight required to safely drill the well
Factors Affecting Kick Tolerance
Gas Behavior and Bottom Hole Pressure in a Shut in well
Gas Behavior with Constant Bottom Hole Pressure
How Does 1029.4 Come From?
How to Predict Formation Pressure Prior to Drilling
Kick Tolerance
Kick Tolerance Concept and Calculation for Well Design
Kill Rate Selection
Kill The Blow Out Well Using Nuclear Bomb
Know about Swabbing and Well Control
Lag Time for Drilling Business and How to Calculate Theoretical Lag Time
Learn About Drill Pipe Float Valve
Learn about Maximum Surface Pressure in Well Control (MASP, MISICP and MAASP)
Let’s apply U-Tube concept
Lost circulation and well control
Maximum formation pressure that can be controlled when we shut the well in
Maximum influx height to equal the maximum allowable shut-in casing pressure
Maximum Initial Shut-In Casing Pressure (MISICP)
Pore Pressure Evaluation While Drilling Is Important For Well Control
Positive Kick (Wellbore Influx) Indications
Possible Kick (wellbore influx) Indications Part1
Possible Kick (wellbore influx) Indications Part2
Practice to drill the well at near balance condition in conjunction with well control precaution
Pressure Loss and Equivalent Circulating Density Review
Pressure Loss and Equivalent Circulating Density Review – Reverse Circulation
Review Hydrostatic Pressure and U-Tube Concept
Shut in Procedures and Their Importance
Surge Pressure, Swab Pressure and Trip Margin
Trip Margin Calculation
Understand about Friction Pressure Acting in Wellbore
Understand Hydrostatic Pressure
Understand the Formation Pressure
Understand U-Tube and Importance of U-Tube
Water Kick and Oil Kick Indications
Well Control or Blow out
What are differences between Full Opening Safety Valve (TIW valve) and Inside BOP valve (Gray Valve)?
What are differences between possible and positive well control indicators
What are the differences between FIT and LOT?
What is “Background Gas”?
What is “Connection Gas”?
What is “Drilled Gas”?
What is “Trip gas”?
What is a trip tank?
What is Flow Check?
What is Primary Well Control?
What is Secondary Well Control?
What is space out in drilling (especially in well control)?
What is Tertiary Well Control?
Why Do We Need To Minimize Influx (Kick)?
Why Was This Well Control Situation Happened?

Shut in Procedures

2 Types of Shut-In (Hard Shut In and Soft Shut In)
Determining Correction Initial Circulating Pressure
Post Shut-In Procedures while Drilling
Post Shut-In Procedures While Tripping -What data should be recorded?
Shut-In Procedure while Drilling
Shut-In Procedure while Tripping
Shut-In while Wireline Logging Operation

Surge and Swab Calculation

Determine surge and swab pressure for close-ended pipe
Determine surge and swab pressure for open-ended pipe
Determine surge and swab pressure method 2
Determine surge and swab pressure method 2 Calculation Example
Surge and Swab Calculation Method 1

Shoe Pressure While Circulating Kick

Shoe pressure when the gas kick is above a casing shoe
Understand shoe pressure – Shoe pressure when the gas kick Passing Shoe
Understand shoe pressure – Top of Gas Kick Below the Shoe

Well Control Equipment

Blow Through Situation in Mud Gas Separator (Well Control Equipment)
Design Factors Relating To Properly Design The Right Size of Mud Gas Separator for Drilling Rig
Drill string valves and IBOPs VDO Training
Mud Gas Separator (Poor Boy Degasser) Plays A Vital Role in Well Control Situation
Trip Tank and Its Importance on Well Control

Blow Out Preventer

4-Way Valve Operation in Blow Out Preventer Accumulator (Koomey) Unit
Accumulator (Koomey)
Annular Preventers
API Ring Gaskets Used in BOP Connections
Basic Understanding of Sub Sea BOP VDO Training
Blow Out Preventer (BOP) Equipment VDO Training
Blowout Preventers (BOP) VDO Training
BOP testing procedures
Calculate Bottles Required for Koomey Unit (Accumulator Unit)
Diverter Systems In Well Control
Mechanism of Accumulator (Koomey Unit)
Ram Preventers as Well Control Equipment
Reserve Fluid System and Pumping System in Koomey Unit
Understand More about Pipe Rams, Variable Bore Rams and Shear Rams
What is Closing Ratio in Blow Out Preventor (BOP)?

Driller’s Method

Advantages and Disadvantages of Driller’s Method
Bottom hole pressure change while performing well control operation with driller’s method
Circulate Kill Mud – 2nd Circulation of Driller’s Method
Circulate Out The Influx Holding Drill Pipe Pressure Constant
Driller’s Method in Well Control
Driller’s Method or Wait and Weight Method – What is The Practical Well Control Method for You?
Driller’s Method Quiz No. 1
Driller’s Method Quiz No. 2
Driller’s Method Quiz No. 3
Driller’s Method Quiz No. 4
Establish Circulation in Driller’s Method Step – 1
Float Bumping Procedures To Get Shut In Drill Pipe Pressure
How are pressure and pit volume doing during the first circulation of the driller’s method?
How is pressure doing for the second circulation of driller’s method
Lag Time and Its Importance for Well Control Operation
Shut Down And Perform Flow Check – Last Step of Drille’s Method
Shut Down Pumps and Weight Up Mud in Driller’s Method
Shut in the well and get pressure data (driller’s method)
Summary of Driller’s Method

Wait and Weight Methond (Engineering’s Method)

Advantages and Disadvantages of Wait and Weight Method
Drill Pipe Pressure Schedule Calculation for Wait and Weight Well Control Method
Formulas for Wait and Weight Well Control Method
How wait and weight method controls bottom hole pressure
Pressure Profile of Drillpipe and Casing Pressure while killing a well with wait and weight method
Slow Circulation Rate (SCR)
Wait and Weight Well Control Method (Engineer’s Method)

Volumetric Well Control

How To Perform Volumetric Well Control Method
Volumetric Well Control – When It Will Be Used
Volumetric Well Control Example Calculation

Lubricate and Bleed Well Control

Lubricate and Bleed in Well Control
Example of Lubricate and Bleed Well Control Calculation

Bullheading Well Control

Bullheading Well Control
Bullheading Calculation Example

Horizontal Wells Well Control

Introduction To Well Control for Horizontal Wells
Kick Scenarios in Horizontal Wells For Well Control
Kick Prevention for Horizontal Wells
Behavior of Gas in a Horizontal Well Kick

Deepwater Well Control

Choke Line Friction – How Does It Affect Deepwater Well Control?
Choke Line Friction Pressure as Kill Weight Mud Approaches the Surface
Fracture Gradient Reduction Due to Water Depth
Hard Shut-In Procedure while Drilling with a Subsea BOP Stack
How To Compensate Choke Line Friction For Deep Water Well Control
How To Measure Choke Line Friction (CLF) for Deepwater Well Control
Riser Margin – One of Important Concepts For Deep Water Drilling
Shut-In Procedure while Tripping with a Subsea BOP Stack

Stripping Well Control

Basic Understand of Stripping Operation Well Control with Gas Influx
Basic Understanding About Well Control With Pipe Off Bottom
Kick Penetration For Stripping Operation
Practical Considerations for Stripping Well Control Operation
Stripping Methods for Non Migration Kicks When There is an Off Bottom Well Control
Stripping Procedure with Volumetric Control For Migrating Kick
Stripping Procedure without Volumetric Control for Non-Migrating Influx
Stripping with Volumetric Control Steps and Example Calculation

Hole Monitoring Procedure

Hole Monitoring Procedures While Drilling or Milling Operation
Hole Monitoring Procedures While Running Casing
Hole Monitoring Procedures While Tripping

Ballooning in Well Control

How to Identify Well Ballooning
How to Prevent Well Ballooning
Well ballooning (wellbore breathing or micro fracture)

Useful Excel Files and Ebook

Download Wild Well Control Technical Book
Free BOP Drawing Template
Free Useful Well Control Spread Sheet – All Important Well Control Formulas For Oilfield Personnel
Trip Sheet Excel File
Well Control Kill Sheet Free Download
Well Control Tracking Sheet


Blow Out on The Rig Floor VDO
Oil Field Conversion Part 1 – Area, Circulation Rate, Impact Force
Well Control Acronyms
Well Control Formulas Part 1
Well Control Formulas Part 2
Well Control Formulas Part 3
Well Control Formulas Part 4
Well Control Formulas Part 5
Well Control Formulas Part 6
Well Control Procedure for Non-Shearable String
Well Flowing After Disconnecting The Wireline Lubricator – Well Control Situation (VDO)

Well Control Quiz Online

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9 Responses to Well Control

  1. Henk Kiekebelt says:

    Thanks very usefull.

  2. AHMAD says:

    Excellent & useful page

  3. Ba Kyi says:

    its very important tips for every petroleum professional in drilling operation in the world.

  4. Osvaldo Fernandes says:

    Good material. Could you please add my e-mail adress in your distribuition list so that i can receive alô this information by e-mail?

    Thanks in advance

  5. Buen trabajo. Sera posible mandarme todo lo Referente.al sistema de izaje. Corona .polea viajer. Swivel. Y Rotaria. Armado y desarmado . Gracias

  6. Its a very educational tips in a drilling operation.

  7. Mohammad says:

    thanks for all the people who are working on this great web site

  8. Fellman Velarde says:

    The page on Well Control is excellent

  9. badih says:

    very good formula, it is too benefit

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