Skip to main content Drill Quiz

How much do you know about drilling?

Drilling Test originally published in World Oil May 1985 used here with the permission of World Oil.





Check the answer to each multiple-choice question, and click on the "Send Form" button to submit the information. There will be an automated response that will send the answers and an explanation immediately via email. By taking the test you agree to have your email address added to the Drill Science mailing list. At this time there is no plan to send emails nor will your email address be sold or otherwise abused at any time for any reason. There are no regularly schedules emails to be sent at this time. If there is in the future there will be a link to opt out included. Thanks and enjoy the test to assess how much you really know about drilling!

1. How much does 10,000 ft of 5-in., 19.5-ppf, Class E, XH drill pipe weigh in air?:
209,000 lb.
195,000 lb.
221,000 lb.

2. If you are circulating water and using hydraulic radius (D = D Hole - D pipe) to calculate Reynolds Number, are you more likely to have turbulent flow alongside the drill collars or drill pipe?:
drill collars
drill pipe

3. As you drill deeper with a given hole, pipe and pump size; to provide maximum bit hydraulic horsepower do you need more, the same, or less pump horsepower?:
more pump horsepower
the same pump horsepower
less pump horsepower

4. If you lose circulation with mud, and then fill the annulus with water, do you lose hydrostatic pressure?:

5. If casing is suspended off-bottom in mud, the bottom of the string is?:
In tension
In compression

Is the casing string:

6. After running the first few joints of casing, at what point does mud flow from the hole?:
When lowering a joint
When pipe is set in slips

7. If tubing was slacked off on a packer and a subsequently run wireline tool stops near the packer, what simple operation may allow the tool to drop to bottom?:

8. When pulling pipe and using an accurate trip tank for hole filling, the amount of mud you would normally expect to add is?:
Equal to the volume of steel removed
More than the volume of steel removed
Less than the volume of steel removed

9. When circulation is established, the weight of the drill collars is?:
Equal to the buoyed weight
More than the buoyed weight
Less than the buoyed weight

10. When attempting a back-off operation where the buoyed weight of drill pipe is being held to the backoff depth, the tool joint being shot is?:
In neutral axial load
In compression
In tension

11. Drilling jars are run in a 900-ft drill collar string below the top collar and bit weight is 80% of buoyed weight of the drill collars. Total depth is 10,000 ft. Mud weight is 10 ppg. Under these conditions, the jars are?:
In axial tension
In axial compression
Neutral axial load

12. The capacity of 19.5-ppg Grade E X-Hole drill pipe (NC-50) is?:
The same as Grade S
Less than Grade S
More than Grade S

13. You are circulating kill weight mud following a kick. The pipe sticks before kill weight mud reaches the surface because the annulus is packed off. Drill pipe pressure is zero, and casing pressure bleeds off. You back off at the top of the collars. The well probably will?:
Remain static
Start flowing
Lose circulation

14. You set a balanced cement plug at 10,000 ft using 19.5-ppf Grade X drill pipe. You use the table value of 5-in IEU DP capacity (0.01776 bbl/ft) plus line capacity from the cement pump to the drill pipe to displace cement and water spacer to equalization in a gauge hole. You have actually?:
Accurately balanced the plug
Underdisplaced plug
Overdisplaced about 5 bbl of water spacer and/or mud in to the plug

15. Which of the following can be true for pipe in mud, either suspended, fastened at bottom or slacked off?:
In axial compression and straight
In axial tension and buckled
In axial compression and buckled
In axial tension and straight

16. To run casing you string up 10 lines instead of eight. Neglecting line weight, the load on the derrick is?:

17. When drilling on the Gulf Coast or other predominantly sand and shale areas, lost circulation usually occurs?:
At the latest casing seat
Within 100 ft of the latest casing seat
Within 500 ft of the latest casing seat
At bottom

18. When you run a stand of drill pipe in the hole rapidly or spud the kelly rapidly with the pump on, you?:
Produce a greater pressure surge with the stand
Produce a greater pressure surge with the kelly

And, as a result?:
The surge is all positive
There is a negative surge in bottom hole pressure following the increase

19. You are circulating out a kick while holding the drill pipe pressure constant. You circulate faster and hold the same drill pipe pressure by adjusting the choke. In doing so, you?:
Increase bottomhole pressure
Decrease bottomhole pressure
Do not change bottomhole pressure

20. You drill a straight hole, set intermediate casing, cement the bottom 20% of the casing and hang the casing with full weight as cemented. You then drill deeper and increase the mud weight. As a result, you may?:
Create a significant dog leg and wear point in the casing
Make no change in casing straightness

21. Equations commonly used to calculate fracturing pressure and fracturing mud weight are?:
Fundamental expressions of breakdown pressure physics
Fundamental expressions of fracture extension pressure physics
Fracture extension pressure equations using empirically derived matrix stress coefficients

22. You cement squeeze a permeable sand with neat cement and obtain a final bottomhole squeeze pressure equal to overburden gradient. Cement in the casing opposite the perforations and for a few feet above them is probably?:
Cement slurry of same properties as cement still in the work string
Solid cement filter cake
A slurry of slightly increased density

23. Under which of the following conditions is the burst pressure on the casing in a well being drilled the greatest?:
When the well blows out and is closed in on dry gas
When a large gas kick occurs and the well is closed in

24. A 5,000-psi working pressure, 10,000-psi test pressure blowout preventer is designed to hold what amount of pressure when closed?:
5,000 psi
10,000 psi
7,500 psi

25. The fluid capacity of a 3,000-psi, 11-gal accumulator botle is approximately?:
5 gal
11 gal
10 gal

26. You drill a thick gas sand, and when gas-cut mud reaches the surface, mud weight is cut from 18 to 9 ppg. The reduction in bottomhole pressure is approximately equivalent to?:
1 ppg
2 ppg
Less than 0.2 ppg

27. You are circulating out a kick using the driller's method. When the principal part of the gas passes the surface casing seat, and choke pressure continues to increase, the pressure at the casing seat?:
Also increases
Remains constant

28. You calculate the annular surface pressure while circulating out a kick assuming a single bubble. The graph for casing pressure vs. volume pumped looks like this?:

In this situation, will maximum casing pressure occur well ahead of the calculated peak time, after the calculated peak time, at the time calculated, and will it be about 2/3 to 3/4 of, the same, or more than the value calculated?
Occur well ahead of the calculated peak
Occur after the calculated peak time
Occur at the time calculated
Be about 2/3 to 3/4 of the value calculated
Be the same as calculated
Be more than calculated

29. You drill through two sands of nearly equal pore pressure. In which will filtrate invasion of the formation be greater?:
100 md, 20% porosity
5 md, 5% porosity

30. Hydraulic hammer in a pump is the result of?:
Insufficient pulsation damping
Insufficient suction charging
Piston ramming mud in insufficiently filled cylinder
Mud ramming piston as it slows