IWCF Well Control for Combined Surface/Subsea BOP Level 3,4
IWCF Well Control for Combined Surface/Subsea BOP Level 3,4
Course Outline
Day 1
The impact of a well control incident
The need for well control training and assessment
Factors that affect hydrostatic pressure
Hydrostatic pressure calculations
Formation pore pressure
Formation pore pressure as the lower limit of the mud weight window
The effects of water depth on formation fracture pressure
Fracture pressure
Fracture pressure as the upper limit of the mud weight window
Factors that can influence primary well control
Pore and fracture pressure estimation and the potential impact on primary well control
Secondary well control
Appropriate secondary well control equipment selection
The well barrier elements in well operations
The principles of different well barrier element types
Barrier terminology
Verification of well barrier elements
The criteria to test barrier elements
Documentation for well barrier tests
The correct action to take when a well barrier element test fails
How to verify the continued integrity of the well barrier envelop
Risk management
The Management of Change (MOC) process
The importance of checklists for operations with well control implication
The need for well control drills
The management of nonshearable and nonsealable tubulars through the BOP
The effect of fluid properties in the riser, booster, choke, and kill lines
The effect of riser margin on bottom hole pressure
The causes of kicks
The consequences of failing to keep the hole full
Factors that affect fluid density
Operations which can reduce hydrostatic head
Gas cutting of drilling fluid
The causes of gas cutting
The potential causes of lost circulation
The actions to take in the event of losses during normal operations
The possible consequences of losses on riser integrity
The causes of swabbing and surging
The consequences of swabbing and surging
Downhole swabbing and surging from the vessel motion on
The tripping process The risks associated with tripping
Actions to take when there are deviations from predicted trip tank volume
The actions to take after trip sheet evaluation shows an influx
Common tripping practices influx in the tubular
Homework
Day 2
Homework revision
Kick warning signs while drilling and/or circulating
Kick warning signs when tripping
Actions to take after recognising a kick warning sign
Kick indicators and the importance of early kick detection
The interpretation of well flow-back (for example finger-printing’ and trend analysis(
The effect of rig motion on detecting kick indicators
Shallow Gas
The consequences of shallow gas kicks
Prevention of shallow gas kicks
The requirements for operations in a shallow gas zone
Managing shallow gas flow
implications of drilling top hole with or without a riser
The methods to identify and minimize the impact of a shallow gas kick
The use of barite
Bottom hole circulating pressure and Equivalent Circulating Density (ECD)
The relationship between pump pressure and pump speed
The relationship between pump pressure and mud density
The process of taking Slow Circulation Rates(SCR)
The factors that influence selection of slow circulating rates
How to establish choke line friction when using a subsea BOP
The purpose of a Leak Off Test (LOT), and the difference between a LOT and a Formation Integrity Test (FIT)
How to perform a LOT or a FIT
The pressure versus volume graph from the LOT or FIT data
How to select MAASP from LOT/FIT results
When and why MAASP must be recalculated
The principles of kick margin/tolerance/intensity and how it is applied to well operations
The different types of influx and the hazard they present
How an influx can change as it is circulated up a well
The importance and use of the gas laws
Influx migration
The effects of influx fluids on the primary fluid barrier
The solubility of hydrocarbon, carbon dioxide and hydrogen sulphide gases when mixed under downhole conditions with water based or (pseudo) oil based drilling fluid
The behaviour of dissolved gas in different drilling fluid
types when circulating the influx to surface including the effects of temperature and pressure
The impact of downhole conditions on the hydrocarbon gas state (gas or liquid influx)
The actions required to mitigate the effects of gas break out
The behaviour of a gas influx as it circulates a horizontal well
The effects of gas expansion in the riser
The actions to take with gas expansion in the riser
Homework
Day 3
Homework revision
A suitable shut-in procedure if a primary barrier fails
Monitoring the well after it is shut-in
The actions to take with gas in the riser above the BOPs
The hard shut-in method
How to confirm if well closure is successful and the actions to take if not
When and how to hang off the string in a well control situation
Wire line movement effect on BHP
Shut-in procedures while wire line logging operation
The limitation of BOP during wire line operations
5 recording parameters when shut-in well
Obtaining and interpreting shut-in pressures
Trapped pressure
The SIDPP with a float valve in the drill string
limitations of pressure gauges and different readings on rig
using of dedicated gauges for SIDPP and SICP
gas migration and causes of pressures increase and actions taken
Controlling BHP when an influx is migrating
Standard well control methods
The difference between controlling and killing a well
Selection of kill pump rate
The appropriate kill methods with the bit on bottom
The appropriate course of action to take when not on bottom
Maintaining constant BHP
The effect of Choke Line Friction (CLF) on BHP when starting and stopping circulation
The effect of CLF on BHP when changing pump speed
The measures to mitigate the impact of CLF
when starting and stopping circulation
How to reduce well annular pressure if MAASP (at the well weak point) is approached
Maintaining constant BHP when changing pump speed the driller's method
the wait and weight method
The actions required to establish kill mud weight in the riser and associated lines
The actions required to safely remove gas trapped in the BOP
Complete a kill sheet based on given vertical well data.
The principles of the volumetric process
The procedure required for controlling a well with the Volumetric Method
When the Volumetric Method is the appropriate well control method
The principles of the Lubricate and Bleed Method
The procedure required for controlling a well with the Lubricate and Bleed Method
When the Lubricate and Bleed Method is the appropriate well control technique
The principles of stripping
The procedure required to safely strip into a well
The factors which limit or complicate the ability to strip in the Hole
Factors that increase the risk of kicks while casing operation
how to reduce surge and swabbing pressures
The limitations of selffilling float systems
Monitoring returns when running and pulling casing
The calculation of displacements when tripping casing line
actions if losses happen when running casing
The changes to BHP during a cementing operation
cement job result
events result from entering formation fluids to casing or open hole after a cementing operation
The actions to take if a well starts to flow during a cementing operation
The steps to shut-in a well when running casing
The concept and implementation of well control drills as specified by API standards
Indications that MAASP is exceeded during a well control operation
Indications of downhole or surface problems that can arise during well control operations
How to detect when gauges are malfunctioning
The actions to take when operating limits are being reached or have been reached in a MGS
Leak identification and responses to well
control equipment failure
What hydrates are and the conditions likely to lead to their formation
Hydrate prevention and removal
Monitoring and managing losses during a well control event
PRACTICAL TRAINING ON SIMULATOR
Homework
Day 4
Homework Revision
BOP Stack and configuration.
BOP function, configuration and the well control operations that can be carried out
The overall pressure rating requirements of a BOP stack
The configuration of the Marine Riser, Lower Marine Riser Package (LMRP) and subsea BOP
The operational limits associated with particular BOP ram equipment
changing ram equipment
The function and operating principles of ram locks
The operating principles of BOP blind/shear equipment