SPE Drilling & Well Completion 2

Question 1

What is the primary purpose of a diverter system installed at the wellhead during top-hole drilling?

Accepted Answer

Divert shallow gas flows away from the rig floor to protect personnel

Answer

Prevent blowouts by closing the BOP stack

Answer

Control mud weight during drilling

Answer

Seal the annulus against formation fluids

Question 2

In a horizontal well, what is the primary function of a rotary steerable system (RSS)?

Accepted Answer

Provide continuous rotation while steering the bit to the target trajectory

Answer

Increase weight on bit

Answer

Reduce equivalent circulating density

Answer

Circulate cuttings out of the wellbore

Question 3

Which cement slurry additive is used to prevent gas migration through unset cement?

Accepted Answer

Expanding agent or anti-gas migration additive

Answer

Retarder

Answer

Dispersant

Answer

Weighting material

Question 4

What does the term 'equivalent circulating density' (ECD) represent in drilling operations?

Accepted Answer

The effective mud weight at a given depth accounting for annular friction pressure losses

Answer

The density of the drilling fluid at surface conditions

Answer

The weight of cuttings suspended in the mud

Answer

The density required to prevent wellbore collapse

Question 5

A perforating gun is fired with an underbalanced condition. What is the main benefit of underbalanced perforating?

Accepted Answer

Creates immediate inflow that cleans perforation tunnels of crushed zone debris

Answer

Increases perforation penetration depth

Answer

Reduces casing damage during perforation

Answer

Allows higher shot density

Question 6

Which well control method involves pumping a heavier kill fluid down the drillpipe while holding constant casing pressure?

Accepted Answer

Wait-and-weight (engineer's) method

Answer

Driller's method

Answer

Volumetric method

Answer

Bullheading

Question 7

What is the purpose of a packer in a production completion?

Accepted Answer

Isolate the tubing-casing annulus to direct production through the tubing

Answer

Prevent sand production

Answer

Stimulate the formation

Answer

Control water-oil contact