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Questions and Answers
Which pressure must be greater than the least principal stress in the formation to initiate a fracture in the borehole wall?
Which pressure must be greater than the least principal stress in the formation to initiate a fracture in the borehole wall?
- The minimum horizontal stress
- The formation fluid pressure
- The hydrostatic pressure of the drilling fluid (correct)
- The formation breakdown pressure
What is the direction in which fractures will propagate when the pressure in the borehole exceeds the least of the stresses within the rock structure?
What is the direction in which fractures will propagate when the pressure in the borehole exceeds the least of the stresses within the rock structure?
- Parallel to the maximum horizontal stress
- Parallel to the vertical stress
- Perpendicular to the least principal stress (correct)
- Perpendicular to the maximum horizontal stress
What is the primary well control barrier that cannot be achieved if the formation breaks down and mud losses occur?
What is the primary well control barrier that cannot be achieved if the formation breaks down and mud losses occur?
- Borehole stability (correct)
- Hydrostatic pressure
- Formation fracture pressure
- Drilling fluid density
What is the condition that can lead to formation fluid influx?
What is the condition that can lead to formation fluid influx?
What is the term used to describe the pressure of the drilling fluid column?
What is the term used to describe the pressure of the drilling fluid column?
What is the consequence of the formation breaking down when the borehole pressure exceeds the least principal stress?
What is the consequence of the formation breaking down when the borehole pressure exceeds the least principal stress?
What is the main purpose of conducting LOT and FBT tests?
What is the main purpose of conducting LOT and FBT tests?
When is LOT and FBT testing carried out?
When is LOT and FBT testing carried out?
What is done to avoid the drillbit getting stuck in the openhole during the LOT and FBT tests?
What is done to avoid the drillbit getting stuck in the openhole during the LOT and FBT tests?
What is generally used to close the BOPs during LOT and FBT testing?
What is generally used to close the BOPs during LOT and FBT testing?
Why is pressure applied by pumping a small amount of mud into the well at surface during LOT and FBT testing?
Why is pressure applied by pumping a small amount of mud into the well at surface during LOT and FBT testing?
What is assumed about the weakest part of the wellbore in LOT and FBT tests?
What is assumed about the weakest part of the wellbore in LOT and FBT tests?
What is the purpose of calculating the equivalent circulating density (ECD)?
What is the purpose of calculating the equivalent circulating density (ECD)?
What contributes to the additional pressure at the bottom of the borehole when the drilling fluid is circulating?
What contributes to the additional pressure at the bottom of the borehole when the drilling fluid is circulating?
In the given example, what was the true vertical depth of the casing shoe?
In the given example, what was the true vertical depth of the casing shoe?
What was the surface pressure at leak off in the given example?
What was the surface pressure at leak off in the given example?
What is the calculated maximum mud weight for the next section to be drilled in the given example?
What is the calculated maximum mud weight for the next section to be drilled in the given example?
What was the mud weight used to conduct the leak off test in the given example?
What was the mud weight used to conduct the leak off test in the given example?
What is the primary purpose of a leak off test (LOT)?
What is the primary purpose of a leak off test (LOT)?
When is a leak off test typically conducted?
When is a leak off test typically conducted?
How is the leak off pressure determined during a LOT?
How is the leak off pressure determined during a LOT?
What is the primary use of the leak off pressure determined from a LOT?
What is the primary use of the leak off pressure determined from a LOT?
During a LOT, when is the operation typically terminated?
During a LOT, when is the operation typically terminated?
Which of the following is NOT mentioned as a method to calculate fracture pressure?
Which of the following is NOT mentioned as a method to calculate fracture pressure?
What is the primary purpose of the Formation Integrity Test (FIT)?
What is the primary purpose of the Formation Integrity Test (FIT)?
If fluid begins to leak off into the formation during a FIT, what does it indicate?
If fluid begins to leak off into the formation during a FIT, what does it indicate?
What is the Leak Off Pressure (LOP) used for?
What is the Leak Off Pressure (LOP) used for?
What is the Maximum Allowable Annular Surface Pressure (MAASP) calculated from?
What is the Maximum Allowable Annular Surface Pressure (MAASP) calculated from?
How is the maximum allowable mud weight for the next hole section determined?
How is the maximum allowable mud weight for the next hole section determined?
What safety factor is typically subtracted from the allowable mud weight?
What safety factor is typically subtracted from the allowable mud weight?
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