1. Formation strengths are generally weak when drilling top hole and total losses may occur. How can the risk of total losses be reduced when drilling top hole?
a. By pumping slowly to reduce the drill string pressure loss.
b. Keeping a high overbalance.
c. By controlling penetration rate to prevent loading the annulus with cuttings.
d. Reduce the Mud weight as possible to reduce the risk of formation fracture
2. What is one good operating practice to help to minimize well control problems while drilling top-hole section?
a- Maintain a high drilling rate
b- Maintain a high over-balance in the drilling fluid to avoid going under-balance
c- Maintain the drilling fluid density as low as possible to prevent formation fracture
d- Maintain very high tripping speeds when running in or out of the hole
3. Which of the following statements are good operating practices when drilling TOPHOLE formations where there is a risk of shallow gas? (TWO ANSWERS)
a. Maintain high rate of penetration and keep mud viscosity as high as possible.
b. Use a heavy weight mud to create maximum overbalance.
c. Pump out of the hole on trips.
d. Use oil-based mud.
e. Drill a pilot hole at a controlled rate.
4. During top hole drilling from a jack-up rig, the well starts to flow due to shallow gas. What will be the safest action to take to secure the safety of the rig and personnel? (TWO ANSWERS)
a- Start pumping mud into the well at the highest possible rate.
b- Activate the diverter system and remove non-essential personnel from the rig floor.
c- Shut in the well and prepare for kill operation.
d- Activate the blind/share ram to shut in the well.
e- First, line up to the mud/gas separator, close the diverter and send personnel from the rig floor.
5. When drilling top hole with a risk of shallow gas, which actions are considered good practice? (TWO ANSWERS)
a- Drill a pilot hole at a slow controlled rate.
b- Maintain high Rate of Penetration (ROP) so that fluid viscosity is as high as possible.
c- Pump out of the hole while tripping
d- Regularly pump a fresh water pill to clean cuttings from the hole.
e- Use heavy density fluid to create maximum overbalance
6. When top hole drilling, a well starts to flow due to shallow gas. What is the safest action to take to secure the safety of rig and personnel?
a- Activate the blind/shear rams to shut in the well
b- Activate the diverter system, and remove non-essential personnel form the rig floor and hazardous areas.
c- Line up the Mud Gas Separator, (MGS), activate the diverter system and remove personnel from the rig floor
d- Shut in the well and prepare for kill operations immediately
7. If a shallow gas flow is detected, which action is required as the flow is diverted?
a- Decrease the pump rate
b- Increase the pump rate
c- Maintain the pump rate
d- Stop pumping
8. Is it true that shallow gas kicks are easier to handle than those taken when drilling deeper?
a. Yes.
b. No.
ANSWERS
1. C 4. A-B 7. B
2. C 5. A-C 8. B
3. C-E 6. B
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