Well Control: Activity 2

1) The Volumetric Method is being employed to bring a gas influx to surface because circulation was impossible – no pipe in the hole. During a bleed step the choke operator should adjust the choke to accomplish what? 

a. Allow SICP to rise by the calculated amount. 
b. Allow SICP to fall by the calculated amount. 
c. Hold SICP constant at the proper Pchoke value. 
d. Bleed the calculated volume in a timely manner. 

2) A driller observes a warning sign for a kick. Why is it better to continue pumping while raising the pipe to the shut-in position? 

a. To minimize downtime. 
b.To minimize the amount of influx by keeping the annular pressure loss as long as possible. 
c. The driller should shut-off the pump before picking up to identify the influx as soon as possible. 
d. To prevent sticking the pipe.

3) The well is shut-in on a gas kick and while preparing to begin the Wait and Weight Method, both SIDPP and SICP have risen by 300 psi due to gas migration. Before beginning to circulate, what must be done if constant bottom hole pressure is required?

a. Bleed SICP back to the original shut-in value.
b. Bleed small amounts of mud through the choke until the SIDPP is back to the original shut-in value.
c. Bleed a “few barrels” of mud out of the annulus and see what happens.
d. Do nothing – carry the 300 psi as a safety factor.

4) 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 drill pipe pressure is 450 psi.

What will the most likely shut-in casing pressure be?

a. The same as the shut-in drill pipe pressure.
b. Higher than the shut-in drill pipe pressure. 
c. Lower than the shut-in drill pipe pressure.
d. Impossible to say if the exact location is not known.

5) The principle involved in the CONSTANT BOTTOM HOLE PRESSURE method of well control is to maintain a pressure that is:

a. Equal to the slow rate circulating pressure.
b. At least equal to the formation pressure.
c. Equal to the shut-in drill pipe pressure.
d. At least equal to the shut-in casing pressure.

6) A vertical well with a surface BOP stack is shut-in after a kick. The pressure readings are as follows:

Shut-in Drill Pipe Pressure = 680 psi
Shut-in Casing Pressure = 890 psi

What is the reason for the difference in these two pressures?

a. The influx is in the drill pipe.
b. The influx has a lower density than the drilling fluid.
c. The influx has a higher density than the drilling fluid.
d. The BOP was closed too fast which caused trapped pressure

7) Formation fluids can flow into the well if:

a. Formation pressure is greater than hydrostatic pressure.
b. Hydrostatic pressure is greater than formation pressure.
c. Answer “a” and the formation must have permeability.
d. Answer “b” and the formation must have porosity.

8) A well is brought on choke correctly and afterward it is realized that the initial circulating pressure is higher than anticipated. This is diagnosed as a plugged jet. It is decided to proceed with this higher ICP and correct the FCP calculation. (Wait and Weight Method). Use the data below, calculate the corrected FCP.

Observed ICP = 1500 psi Kill weight mud = 13.5 ppg
Calculated ICP = 1150 psi Original weight mud = 12.0 ppg
SIDPP = 600 psi

      a. 619 psi         b. 1092 psi         c. 1013 psi        d. 782 psi

9) At what point during a well kill operation would you expect the highest pressure at the casing shoe?

a. At initial shut-in.
b. When the top of the gas reaches the shoe.
c. When the kill weight mud reaches the bit.
d. Any of the above could be correct depending on wellbore geometry

10) From the following list, which “two” are considered advantages that the Wait and Weight Method of Well Control has over the Drillers Method of Well Control? (Choose two answers)

a.The Wait and Weight Method provides less "on choke" circulating time.
b. The Wait and Weight Method always provides lower equivalent pressures at the casing shoe.
c. Since the Wait and Weight Method is a "one circulation kill", less barite is utilized making it the cheaper method of killing a well. 
d. When the drill string volume is "less" than the annular open hole volume, the Wait and Weight Method will provide lower pressures at the casing shoe.

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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