Well Control: Activity 6

1) When tripping out of the hole, with 30 stands remaining, it is noticed that the well is flowing. Which one of the following actions should be taken to close the well in using the soft shut-in ? 

a. Close the BOP                                           
    Stab full opening safety valve 
    Close the safety valve
    Open choke
    Record the pressure. 

b. Stab a full opening safety valve  
    Close the safety valve 
    Open BOP HCR 
    Close the BOP 
    Close choke
    Record pressure 

c. Stab full opening safety valve 
    Open BOP HCR
    Close BOP 
    Close choke 
    Record pressure

d. Open BOP HCR 
    Close BOP 
    Stab full opening safety valve 
    Close safety valve 
    Close choke 

2) Which list below (a,b,c or d) describes how the choke manifold will most likely be set up for Soft Shut-in while drilling?

BOP Side Outlet
Hydraulic Valve (HCR)
Auto Choke
(Remote Adj. Choke)


3) Listed below are two procedures for shutting in a kicking well: 

1. With the choke already open, pick up off bottom, shut down pumps, open BOP Side Hydraulic Valve, close the BOP, close the choke, record pressures. 
2. With the choke already closed, pick up off bottom, shut down pumps, close the BOP, open BOP Side Hydraulic Valve, record pressures. 

Match the procedures to the title below, put the number in the space: 

Titles Procedure                     No. 

a. Soft Shut-in                     __________ 
b. Hard Shut-in                   __________

4) The difference between a hard shut-in and soft shut-in is that in the hard shut in:

a. the blind rams are used.
b. the blowout preventer is closed with the choke open.
c. the blowout preventer is closed with the choke closed.
d. the kick is diverted.

5) The main advantage of the soft shut-in procedure over the hard shut-in procedure is:

a. to stop a “hydraulic shock” which might break down the formation.
b. to prevent further influx of formation fluids.
c. to allow pressures to be determined.
d. all of the above.

6) When a kick occurs, why is it important to get the well shut-in as soon as possible?

a. A larger pit gain will result in a higher SIDPP resulting in a heavier kill mud weight.
                                                TRUE                            FALSE
b. A larger pit gain will result in higher SIDPP and SICP.
                                                TRUE                            FALSE
c. A larger pit gain will result in higher SICP but SIDPP will stay the same.
                                                TRUE                            FALSE

7) Fast drilling in large diameter hole may cause an error in shut-in pressures. If a well is shut-in on a kick just after a period of fast drilling, would you expect the shut-in casing pressure to be: 

a . Higher than if drilling had been slow.
b.  Lower than if drilling has been slow.
c.  The same, whether the annulus is clean or loaded.

8) Which of the following parameters primarily affect the value of the shut-in casing pressure when a well is shut in during a kick? (Choose three answers)

a. The pore pressure.
b. The bottom hole temperature.
c. The hole or annulus capacity.
d. The drill string capacity.
e. The kick volume.
f. The length of the choke line.

9) A hydraulic delay exists between the time the choke is adjusted to the time the drill pipe pressure reacts. This hydraulic delay is:

a. Equal to the speed of sound.
b. About 1 second per 300 meters of travel time.
c. Always equal to 20 seconds.
d. This is a myth, no hydraulic delay actually exists.

10) A vertical well with a surface BOP stack is shut-in after a gas kick has been taken. The bit is 950 ft off bottom and the influx is calculated to be from bottom to 300 ft above (bottom). Shut-in Casing Pressure is 450 psi.

What will the most likely Shut-in Drill Pipe Pressure be?

a. The same as the shut-in casing pressure.
b. Higher than the shut-in casing pressure.
c. Lower than the shut-in casing pressure, because of the effect of the ECD.
d. Impossible to say if the exact location is not known.

NB: We are very thankful to the well control community. We will be very happy to receive your comments or objections for sharing this content. Facebook page Drilling Course , E-mail: drilling.course@gmail.com

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