SPE Drilling & Well Completion 3

Question 1

During a pressure test of a casing string, what does a 'pressure bleed-off' observed after shutting in the pump typically indicate?

Accepted Answer

A leak in the casing, connection, or shoe

Answer

The casing passed the test

Answer

Normal pressure equalization with formation

Answer

Thermal expansion of mud

Question 2

What drilling fluid property is most critical for preventing differential sticking?

Accepted Answer

Filter cake quality and thickness

Answer

Plastic viscosity

Answer

Yield point

Answer

pH level

Question 3

In hydraulic fracturing, what is the 'closure stress'?

Accepted Answer

Minimum horizontal stress that acts to close an induced fracture

Answer

Pressure required to initiate a fracture

Answer

Friction pressure loss in the fracture

Answer

Net pressure inside the fracture

Question 4

What is the function of a float collar installed above the float shoe during primary cementing?

Accepted Answer

Provide a secondary check valve to prevent cement backflow and act as a landing seat for wiper plugs

Answer

Prevent cement from contaminating pay zones

Answer

Increase cement slurry density

Answer

Guide the casing to bottom

Question 5

Which log is most commonly used to evaluate cement bond quality behind casing?

Accepted Answer

Cement bond log (CBL)

Answer

Gamma ray log

Answer

Resistivity log

Answer

Caliper log

Question 6

A kick is detected while drilling. Which surface indicator is typically the FIRST to be observed?

Accepted Answer

Increase in mud pit volume

Answer

Decrease in pump pressure

Answer

Increase in rate of penetration

Answer

Change in mud weight

Question 7

What is the purpose of 'wash over' operations in fishing?

Accepted Answer

Mill or wash over stuck fish to free it by removing surrounding formation or debris

Answer

Clean the borehole of cuttings

Answer

Pump cement around the fish

Answer

Circulate kill-weight mud around fish