Q55) There is pressure build up in annulus between two casing strings after the cement job of last casing.
What would be the effect of this pressure build up? SELECT THREE ANSWERS
a) The shoe of the inner casing may fracture.
b) The shoe of the outer casing may fracture.
c) The inner casing may collapse.
d) The outer casing may collapse.
e) The ECD while drilling will increase.
f) The inner casing may burst.
g) The outer casing may burst.
Q56) A kick can only occur when primary well control is lost and the formation has sufficient porosity.
a) True
b) False.
Q57) What is the main function of the trip margin.
a) The trip margin gives extra hydrostatic head and increases drilling rate
b) The trip margin provides an extra safety margin to prevent going underbalanced when swabbing takes place.
c) The trip margin ensures swabbing can never take Place.
Q58) While tripping into the hole the driller notices that the displaced volume from the well is less than calculated . What is the likely cause?
a) Gas has been swabbed into the well bore.
b) The well has kicked and gas is migrating up the wellbore.
c) Total losses have occurred ..
d) Partial lost circulation has occurred.
Q59) A well needs to be closed in immediately when a kick warning sign is observed.
a) True
b) False.
Q60) Swabbing causes an increase in hydrostatic pressure when putting out of hole.
a) True
b) False.
Q61) Which of the following increases the chances on swabbing? SELECT THREE ANSWERS
a) Pulling out of hole fast.
b) A large open hole/ drill collar capacity
c) A tong BHA.
d) A drilling fluid with a low viscosity
e) A drilling fluid with a low gel strength
f) Pulling through an obstruction with the pumps on
g) Pulling through an obstruction with the pumps off
Q62) When formation fluids are swabbed into the wellbore, the well kicks immediately.
a) True
b) False.
Q63) When the differential pressure between the hydrostatic drilling fluid pressure and the formation pressure reduces, the drilling rate decreases.
a) True
b) False.
Q64) You’re drilling a sandstone that contains some gas. The well is overbalanced. What should you do?
a) Remove the gas using the vacuum degasser.
b) Close the BOP and route the return flow via the mud/ gas separator
Q65) Which of the following is a kick indicator
a) Increase in chloride content
b) Increase in flow rate.
c) Increase in temperature gradient
d) Increase in gas levels.
Q66) When flow is observed the following should be done
a) Flow check the well immediately
b) Increase the drilling fluid density
c) Shut-in the well immediately.
d) Close the diverter.
Q67) Which of the following drilling practices would be considered when connection gas is noticed?
SELECT TWO ANSWERS
a) Pulling out of the hole to change the bit.
b) Raising the drilling fluid yield point.
c) Minimizing the time during a connection when the pumps are switched off.
d) Controlling drilling rate so that only one slug of connection gas is in the hole at a time.
e) Pumping a low viscosity pit around bit to reduce balling up of bit or stabilizers.
Q68) White tripping out of the hole it is noticed that the drilling fluid 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.
Q69) 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 drilling fluid.
C) Abnormal pressure.
d) Not keeping hole full
Q70) Which of following practices are likely to increase the chances of swabbing? SELECT THREE ANSWERS
a) Putting pipe slowly.
b) Maintaining high drilling fluid viscosity.
c) Pulling through tight spots with pumps off.
d) Pulling pipe fast
e) Pulling through tight spots with pump on.
Q71) Which of the following possible warning signs indicate that welt may go underbalanced? 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
Q72) Which of the following is the first reliable indication that the welt is flowing?
a) Increase in torque.
b) Gas cut drilling fluid.
c) Decrease in pump pressure.
d) Increase in return flow.
Q73) While POOH, swabbing is suspected. The flow check is 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 & 20 stands showed no flow. With stand number 25 back in the hole, the well was found to be flowing. What could be the most likely cause of the welt flow?
a) Running into the swabbed fluids caused hydrostatic pressure in annulus to drop.
b) In the hurry, it was forgotten to slug the pipe white preparing for running back.
e) Derrick man mixed too light a slug prior to pulling out of the hole.
d) Abnormal formation fluid pressure.
Q74) A well kill is about to be started_ What can be done to keep BHP constant during the startup.
SELECT TWO ANSWERS
a) Keep the static kill line pressure constant during start-up
b) Keep the casing pressure constant during start-up
c) Reduce the kill line pressure with the CLPL during start-up
d) Increase the kill line pressure with the CLPL during start-up
Q75) During a subsea BOP well kill, gas is starting to displace the drilling fluid in the choke line. What must be done to keep BHP constant?
a) Open the choke some more.
b) Close the choke some more.
c) Keep the choke position constant.
Q76) What action should be taken if the choke line parts between the HCR valve and the remote choke while circulating out a kick?
a) Stop the pump and close the choke.
b) Stop the pump and close the HCR.
e) Stop the pump and close the shear rams.
Q77) You’re in the 1st circulation of the Driller’s Method and are holding the casing pressure constant. What happens to the bottom hole pressure?
a) Increases
b) Decreases
c) Stays the same
Q78) You’re in the 1st circulation of the Driller’s Method. The mud pump starts leaking but you’re keeping the drill pipe pressure constant. What happens to the bottom hole pressure?
a) Increases
b) Decreases
C) Stays the same
Q79) You’re in the 1st circulation of the Driller’s Method. There is a string washout but you’re keeping the drill pipe pressure constant. What happens to the bottom hole pressure?
a) Increases
b) Decreases
c) Stays the same