SPE Drilling Engineering Principles 2

Question 1

What is the primary purpose of a drill stem test (DST) in petroleum engineering?

Accepted Answer

To evaluate reservoir pressure, permeability, and fluid type before completing the well

Answer

To measure the weight of the drill string

Answer

To test the tensile strength of drill pipe

Answer

To measure the rate of penetration

Question 2

In directional drilling, what does the term 'dogleg severity' (DLS) measure?

Accepted Answer

The rate of change in wellbore inclination and azimuth per 100 feet

Answer

The total depth of the wellbore

Answer

The weight applied to the drill bit

Answer

The torque on the drill string

Question 3

Which drilling fluid property describes its ability to suspend cuttings when circulation is stopped?

Accepted Answer

Gel strength

Answer

Viscosity

Answer

Fluid loss

Answer

Density

Question 4

What is the function of a float valve (check valve) installed in the drill string?

Accepted Answer

To prevent backflow of formation fluids up through the drill pipe

Answer

To regulate pump pressure

Answer

To measure formation temperature

Answer

To increase drilling fluid density

Question 5

The equivalent circulating density (ECD) is higher than the static mud weight because:

Accepted Answer

Annular friction pressure losses add to the hydrostatic pressure

Answer

Cuttings are removed from the mud

Answer

The pump pressure decreases downhole

Answer

Temperature reduces mud density

Question 6

What is the purpose of 'reaming' during drilling operations?

Accepted Answer

To enlarge or clean an undergauge section of the wellbore

Answer

To increase the mud weight

Answer

To set casing in the wellbore

Answer

To measure formation resistivity

Question 7

In well control, what is a 'hard shut-in' procedure?

Accepted Answer

Immediately closing the BOP with the choke closed after detecting a kick

Answer

Closing the annular preventer slowly while maintaining pump pressure

Answer

Pumping heavy mud before closing the BOP

Answer

Allowing the well to flow until pressure equalizes