Q 1. Which of the following possible warning signs indicate that well may go under balance? (Select two answers)
a. Increase in pump pressure.
b. Reduction in rate of penetration.
c. Change in cuttings size & shape.
d. Increase in weight on bit.
e. Increase in drilled gas percentage.
Q 2. Which one of the following is the first reliable indication that well is flowing?
a. Increase in torque.
b. Gas cut mud.
c. Decrease in pump pressure.
d. Increase in return flow.
Q 3. After recognizing a drilling break, what is the first action to be taken?
a. Make a flow Check
b. Circulate bottoms up
c. Continue drilling
d. Reduce pump speed
Q 4. What is meant by Primary Well Control?
a. The use of Blow out Preventers to close in a flowing well.
b. The slow circulating rate pressure used in the kill process.
c. The use of mud hydrostatic to balance fluid pressures in the formation.
d. The use of pit volume and flow rate measuring devices to recognize a kick.
Q 5. Will a kick always occur in the event of a loss of return?
a. No, it depends on the mud level in the annulus and the formation pressure.
b. No, it depends on the drill string weight reduction noted on the weight indicator.
c. Yes, losses will always occur above any potential kick zone.
Q 6. A well was flowing when in static condition (i.e. when not circulating) but was not flowing during the circulation. What could be the possible reason?
a. Pressure loss in drill string caused over balance while circulating at the bottom
b. Pressure loss across the bit caused over balance while circulating at the bottom
c. Pressure loss in the annulus caused over balance while circulating at the bottom
Q 7. Why the stand pipe pressure gauge shows little less pressure than pump pressure gauge?
a. Because of the gauge error.
b. Because of the hydrostatic head of the mud in stand pipe.
c. Because position of stand pipe pressure gauge is lower than pump pressure gauge.
d. Because of the dynamic pressure losses from pump to the stand pipe.
Q 8. Which of the following contributes to Equivalent Circulating Density?
a. Drill sting pressure losses
b. Annulus pressure losses
c. Drill bit pressure losses
d. Pressure loss from pump to the string
Q 9. Which of the following factors will increase the circulating pressure? (Select two answers)
a. Use of bigger size of bit nozzle
b. Increase in the length of BHA
c. Increase in the drilled depth
d. Decrease in the mud density during drilling
Q 10. Which one of the following causes of well kick is totally avoidable and is due to lack of alertness of driller?
a. Lost circulation
b. Gas cut mud
c. Abnormal pressure
d. Not keeping hole full
Q 11. Calculate the new slow circulating pressure at 30 spm if mud weight has been increased from 10 ppg to 13 ppg:
SCR @ 30 spm : 400 psi
Drilled depth : 9587 ft
Mud density : 10 ppg
a. 333 psi
b. 520 psi
c. 480 psi
d. 525 psi
Q 12. While drilling, pump pressure was 3000 psi at 80 SPM with 11 ppg mud. What will be the approximate pump pressure, if the pump speed is reduced to 60 SPM & mud weight increased to 13 ppg?
a. 2,250 psi
b. 1,828 psi
c. 2,400 psi
d. 1,888 psi
e. 1,995 psi
Q 13. Which of following practices are likely to increase the chances of swabbing?
(Select three answers)
a. Pulling pipe slowly.
b. Maintaining high mud viscosity.
c. Pulling through tight spots with pumps off.
d. Pulling pipe fast.
e. Pulling through tight spots with pump on.
Q 14. A vertical well is drilled to a depth of 9,500 ft with 11.8 ppg mud, following are the recorded data:
Pump speed 70 spm.
Pressure losses in surface equipment 140 psi
Pressure losses in drill string 800 psi
Pressure losses in annulus 100 psi
Pressure losses at bit nozzles 1400 psi
a. Calculate Bottom Hole Pressure when well is static ______ psi
b. Calculate B H P when mud is circulated at 70 spm _____ psi
c. Calculate pump pressure when mud is circulated at 70 spm ______ psi
d. Calculate the equivalent circulating density ______ ppg
Q 15. In a well, during trip out swabbing was suspected. The flow check was negative and it was decided to run back to bottom (30 stands) checking for flow after lowering every 5 stands. The flow checks after 5, 10, 15 &s 20 stands showed no flow. But with stand number 25 back in the hole, the well was found to be flowing.
A What could be the most likely cause of the well flow?
a. Abnormal formation fluid pressure.
b. Derrick man mixed too light a slug prior to pulling out of the hole.
c. Running into the swabbed fluids caused hydrostatic pressure in annulus to drop.
d. ln the hurry, it was forgotten to slug the pipe while preparing for running back.
Q 16. While tripping out of the hole it is noticed that mud required to fill the hole is less than calculated. What action must be taken?
a. Shut the well in and circulate to clean the hole.
b. Flow check, if negative continue to pull out of the hole.
c. Flow check, if negative run back to bottom and monitor returns.
d. Flow check, if negative displace a heavy slug into annulus and continue pull out.
Q 17. Calculate with following data:
Drill Pipe Capacity = 0.0176 bbls/ft
Drill Pipe Metal Displacement = 0.0082 bbls/ft
Average Stand Length = 90 ft
a. Mud required to fill the hole per stand when pulled `dry‘ ____ bbls.
b. Mud required to fill the hole per stand when pulled `wet‘ ____ bbls.
Q 18. With following well data, calculate the reduction in bottom hole pressure if a driller has pulled out 15 stands of 5″ drill pipe dry, without filling the hole.
Drill pipe capacity – 0.0178 bbl/ft
Drill pipe steel displacement – 0.0080 bbl/ft .
Casing capacity – 0.0744 bbl/ft
Length of one stand – 88 ft
Mud weight – 13 ppg
Reduction In BHP – _____ psi
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