Gasified Liquids
Assessment Gasified Liquids
1. The particle settling velocity is NOT a function of:
A .cuttings density
B .hole diameter ✔
C .particle diameter
D .average drilling fluid density
2. What type of MWD equipment should in wells filled with a compressible fluid?
A .Mud pulse MWD
B .Sonic MWD
C .Electromagnetic MWD ✔
3. Generally, it is recommended to design a circulating program that would fall into the _____ region of the pressure behavior envelope.
A .hydrostatic-dominated
B .friction-dominated ✔
4. High annular velocities are more effective in hole cleaning than fluid rheology.
A .True ✔
B .False
5. Aerated drilling liquids are NOT corrosive.
A .True
B .False ✔
6. Standpipe pressure is the summation of the bottomhole pressure, the pressure drop at the bit, and
A .the wellhead pressure.
B .the atmospheric pressure.
C .the frictional pressure drops. ✔
7. Which of these is NOT one of the advantages of injecting gas into the liquid at the surface before it enters the drillpipe?
A .Easy to setup
B .Achieves lower bottomhole pressures
C .Lower corrosion rates ✔
D .Better bit hydraulics
8. Liquid inflow always ________ the bottomhole pressure and ________ the efficiency of cuttings transport.
A .reduces / increases
B .increases / increases
C .reduces / reduces
D .increases / reduces ✔
9. As a rule of thumb, how much of kill fluids must be stored at the wellsite.
A .Equal to the well volume
B .1.5 times the well volume ✔
C .2.5 times the well volume
D .5 times the well volume
10. Which of these is NOT a good choice for the liquid phase in gasified drilling fluids?
A .Water
B .Brine
C .Diesel
D .Conventional drilling mud ✔
E .Condensate
11. Most of the time, the limiting factor of gasified liquid drilling is the pressure capacity of surface equipment.
A .True ✔
B .False
12. The condition of a drill string being pushed out of the wellbore due to the pressure differential is known as:
A .Snubbing
B .Hydraulic assist
C .Pipe light ✔
D .Stroking
13. Two-phase flow down the drillpipe typically leads to higher frictional pressure losses.
A .True ✔
B .False
14. What is the range of annular velocities that is needed to keep the hole clean with un-viscosified drilling liquids?
A .10 to 50 feet per minute
B .50 to 100 feet per minute
C .100 to 200 feet per minute ✔
D .200 to 350 feet per minute
15. Use of hydrocarbon-based liquids increases the risk of having chemically induced wellbore instability problems.
A .True
B .False ✔
16. Gasified liquids provide a better hydraulic damping of the drillstring vibrations than dry gas.
A .True ✔
B .False
17. Which of these can eliminate the potential corrosion problems associated with gasified liquid drilling?
A .Use of natural gas as gas phase
B .Use of nitrogen as gas phase
C .Use of a hydrocarbon based liquid phase
D .A, B and C ✔
18. Normally, parasite strings are clamped __________ the casing.
A .inside
B .outside ✔
C .neither
19. What is the range of effective densities of gasified liquids used in underbalanced drilling?
A .1 to 3 ppg
B .3 to 5 ppg
C .4 to 7 ppg ✔
D .8 to 11 ppg
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