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Merlin Quiz - Test Your Knowledge

10 Questions… How many can you answer correctly?

Take The New ERD Quiz!

Step 1 of 11

9%

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Which factors listed below are relevant for hole cleaning in a high angle well?
- Flow rate
- String rotation
- Sweeps
- Drilling fluid rheology
- Drilling fluid gel strength

The shakers are close to capacity with large quantities of the material shown in the picture above. What does this indicate?
- Hole cleaning appears to be effective
- The mud system is not inhibitive
- The mud weight should be increased
- Downhole shocks and vibrations are high
- The wellbore is unstable

While drilling a 12-1/4” hole section the stand pipe pressure limit (maximum pressure that the rig can deliver) is approached. A decision is made to pull out of hole due to an MWD tool failure, but there is still 3,300 ft to drill. For the next run to TD which of the options below would be feasible options for reducing the stand pipe pressure, without adding significant risk for the rest of the section?
- Reduce flow rate to 640 gpm
- Change mud pumps pop-off settings
- Increase bit nozzle size / TFA
- Reduce high shear mud rheology
- Remove some heavy-weight drill pipe and/or drill collars

An 8-1/2" hole section is drilled in an ERD well (33,000 ft MD; 82° inclination) with 5-1/2” drill pipe and a short, light BHA (~200ft) and oil based mud. What would you expect to contribute the most to surge and swab pressures?
- Mud weight
- Drill pipe
- Oil / Water ratio
- Inclination
- Bottom hole assembly

Which of the following are benefits of taking pre-connection torque and drag readings with pumps off?
- Avalanching risk reduction
- Less risk of swabbing the formation
- The collected data will be more useful for comparison with tripping data
- Fewer variable / parameters to control for consistency
- Actual data will more closely match modelled data

The driller is back-reaming out of hole with the torque fluctuating between 30 to 40 kNm with a hookload of approximately 300 MT. Is there cause for concern?
- Yes
- No
- Possibly, although more information is required

Downhole tool measurements indicate possible stick-slip vibration while drilling. Select the best course of action.
- Reduce WOB, reduce RPM
- Leave parameters as they are
- Increase WOB, reduce RPM
- Reduce WOB, increase RPM
- Circulate the hole clean

Which of the following are indicators of borehole instability?
- Fill on bottom after trips
- Cavings on the shakers
- Seepage losses
- Divergence of LWD logs from the drilling pass
- ECD lower than predicted (model)

On a re-entry (side-track) well that is planned with 10 ppg WBM in the section that has a high casing wear risk, what would be the most effective method of quantifying wear in the donor well casing?
- Accurately weighing metal collected from the flow line magnet array while drilling
- None of the above
- Simulating wear conditions planned vs historical records
- Running an ultra-sonic wireline logging tool before and after drilling the section
- Running a multi-finger mechanical caliper before and after drilling the section

Floating casing and liner strings is an important enabling technique for ERD wells, however which of the following are considered disadvantages of the technique?
- Inability to circulate when running in hole
- Inability to rotate when cementing
- Handling a large quantity of displaced fluid at surface
- Inability to rotate when running in hole
- Casing collapse risk

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Flow Rate

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Flow Rate Unit

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Hole Size

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Hole Size Unit

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Drill Pipe Size

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Drill Pipe Size Unit

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AV ft per min

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AV m per min

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Differential %

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Wellbore %

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Packoff %

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q1

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q2

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q3

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q4

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q5

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q6

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