CPA Well Control & Blowout Prevention 2

Question 1

Which type of BOP ram can close and seal the wellbore around any size of drill pipe or even on an open hole?

Accepted Answer

Annular preventer (Spherical BOP)

Answer

The annular preventer (also called a spherical BOP) uses a donut-shaped rubber packing element that can seal around any size of drill pipe, kelly, or open hole by compressing inward.

Question 2

What is the 'kill line' on a BOP stack used for?

Accepted Answer

To circulate heavy mud into the wellbore from the surface to kill the well

Answer

The kill line connects the mud pumps to the BOP stack below the pipe rams, allowing heavy kill-weight mud to be pumped into the wellbore to overcome formation pressure and kill the well.

Question 3

What does Shut-In Drill Pipe Pressure (SIDPP) indicate?

Accepted Answer

The formation pore pressure minus the hydrostatic pressure of the mud in the drill string

Answer

SIDPP represents the difference between formation pore pressure and the hydrostatic pressure of the mud inside the drill string, and is used to calculate the kill mud weight needed.

Question 4

What is the primary function of the choke manifold in well control operations?

Accepted Answer

To control annular back pressure while circulating a kick out of the well

Answer

The choke manifold allows the driller to maintain back pressure on the annulus while circulating a kick out, preventing additional formation fluid influx while keeping the bottom hole pressure constant.

Question 5

What does 'gas-cut mud' returning at surface indicate?

Accepted Answer

Formation gas has contaminated the drilling fluid, reducing its density

Answer

Gas-cut mud occurs when formation gas enters the drilling fluid and becomes entrained in it, significantly reducing the mud density and potentially leading to reduced bottom hole pressure and a kick.

(CPA) Certified Petroleum Apprentice Practice Test

(CPA) Certified Petroleum Apprentice Practice Test

CPA Well Control & Blowout Prevention 2