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Merlin Quiz - Test Your ERD Knowledge

10 Questions… How Many Can You Answer Correctly?

Start The New ERD Quiz!

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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?
- The wellbore is unstable
- Hole cleaning appears to be effective
- Downhole shocks and vibrations are high
- The mud system is not inhibitive
- The mud weight should be increased

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
- Remove some heavy-weight drill pipe and/or drill collars
- Increase bit nozzle size / TFA
- Change mud pumps pop-off settings
- Reduce high shear mud rheology

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?
- Inclination
- Mud weight
- Drill pipe
- Oil / Water ratio
- Bottom hole assembly

Which of the following are benefits of taking pre-connection torque and drag readings with pumps off?
- Less risk of swabbing the formation
- Avalanching risk reduction
- Fewer variable / parameters to control for consistency
- Actual data will more closely match modelled data
- The collected data will be more useful for comparison with tripping 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?
- No
- Yes
- 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?
- Seepage losses
- Divergence of LWD logs from the drilling pass
- ECD lower than predicted (model)
- Cavings on the shakers
- Fill on bottom after trips

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?
- 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
- None of the above
- Accurately weighing metal collected from the flow line magnet array while drilling

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 rotate when running in hole
- Handling a large quantity of displaced fluid at surface
- Inability to rotate when cementing
- Casing collapse risk
- Inability to circulate when running in hole

Tool Kit

Try these handy tools from Merlin

AV Calculator

Annular Velocity (AV) is one of the “Three Pillars” of effective hole cleaning in high-angle wellbores, with the other two being pipe rotation and the low-end rheology of the drilling fluid.

Stuck Pipe Mechanism Diagnostic Tool

Diagnose Your Stuck Pipe Mechanism

Head office in Perth, UK. Local support available in Houston and Perth, Australia.

Tel. +44 1738 627 922

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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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