Well Control Quiz 3

Tutorial prepared by Eltun Talibov, Drilling Engineer at State Oil Company of AZERBAIJAN REPUBLIC (SOCAR), Email:Eltun-talibov98@mail.ru

Problem 1 

Drilling ahead at constant rate of penetration (ROP). Shale shakers can’t handle amount of cuttings returning in drilling mud. What would be the safest action ? 

A) Slow down mud pumps until the shakers can handle cuttings 
B) Check for flow- if none, circulate bottoms up at a reduced rate so that the shakers can handle amount of cuttings, flow check periodically during drilling 
C) Check for flow- if none, continue to drilling at the same ROP, allowing half of the mud bypassing the shakers 
D) Check for flow- if none, continue to drilling at the same ROP 

Problem 2 

If gas is migrating and you are unable to start killing operation, which pressure should be held constant to maintain constant bottom hole pressure (BHP)? 

A) Shut in casing pressure 
B) Shut in drill pipe pressure 
C) Casing shoe pressure 
D) Influx pressure 

Problem 3 

Two stands of drill collars are pulled from the well (dry). How many barrels of drilling mud should be added to the well to keep it full? 

Drill collar capacity = 0.0073 bbls/ft 
Drill collar metal displacement = 0.0370 bbls/ft 
Assume one stand 90 feet length 

A) 4.2 bbls 
B) 3.5 bbls 
C) 6.6 bbls 
D) 7.9 bbls 

Problem 4 

Which of the variants below is NOT an indicator of a kick while drilling? 

A) Pit gain 
B) Decrease in pump pressure 
C) Decrease in pump strokes 
D) Return flow rate increase 

Problem 5 

Calculate the initial fracture pressure at the casing shoe using the leak-off plot

A) 6348 psi
B) 6346 psi 
C) 6347 psi 

Problem 6 

Which of the three answers affect the value of SICP after a well is shut in during a kick

A) Annulus capacity 
B) Choke line length 
C) The kick volume 
D) Pressure of formation 
E) Bottom hole temperature 
F) Capacity of drill string 

Problem 7 (open question) 

Explain the reason why drilling a pilot hole is good practice for top-hole drilling? 

Problem 8 

Which of the following would give the highest MAASP

A) When formation breakdown pressure is much higher than mud hydrostatic pressure 
B) When formation pressure is close to mud hydrostatic pressure 
C) The casing shoe is set deep 
D) The casing shoe is set close to surface 

Problem 9 

At 60 spm with 10 ppg mud the pump pressure is 1500 psi. What would be the pump pressure if the rate decreased to 20 spm and mud weight increased to 11 ppg? 

A) 167 psi 
B) 205 psi 
C) 183 psi 
D) 90 psi 

Problem 10 

What happens to MAASP if mud weight is increased? 

A) MAASP will increase 
B) MAASP will not change 
C) MAASP will decrease

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