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Merlin Quiz - Test Your Knowledge
Test your knowledge on the new ERD or TDH quiz from Merlin, how many can you get correct?
Take 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?
Downhole shocks and vibrations are high
The mud weight should be increased
The mud system is not inhibitive
The wellbore is unstable
Hole cleaning appears to be effective
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
Reduce high shear mud rheology
Change mud pumps pop-off settings
Increase bit nozzle size / TFA
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
Bottom hole assembly
Oil / Water ratio
Inclination
Which of the following are benefits of taking pre-connection torque and drag readings with pumps off?
The collected data will be more useful for comparison with tripping data
Actual data will more closely match modelled data
Avalanching risk reduction
Less risk of swabbing the formation
Fewer variable / parameters to control for consistency
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
Possibly, although more information is required
No
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
ECD lower than predicted (model)
Seepage losses
Divergence of LWD logs from the drilling pass
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?
None of the above
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
Accurately weighing metal collected from the flow line magnet array while drilling
Simulating wear conditions planned vs historical records
Floating casing and liner strings is an important enabling technique for ERD wells, however which of the following are considered disadvantages of the technique?
Casing collapse risk
Inability to circulate when running in hole
Handling a large quantity of displaced fluid at surface
Inability to rotate when cementing
Inability to rotate when running in hole
Take The New TDH Software Quiz!
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1. When taking the rotating off bottom weight close to TD in the S-shape well shown, which point shown above is experiencing the highest side force?
Select one
A
B
C
D
E
2. On the drillers torque view above, the torque at 0.40 friction factor is below the torque limit of the drill pipe. Is it safe to assume that drilling with that torque close to TD is within the drill string limit?
Select one
Yes
No
3. The chart above shows a slack-off weight for a floated casing run. At what depth has the floatation collar been installed?
Select one
At 4,600 ft where rapid increase in weight can be observed.
At 6,900 ft where loss in weight can be observed.
None. Driller started filling casing without flotation collar hence increase in weight.
4. You are required to lower standpipe pressure in a 6” hole section as the pop-off valve limit (4,000PSI) is exceeded for the required flow rate of 250 GPM. Reduction in flow rate is not possible. Rheology has been optimised for effective hole cleaning and will likely not change. The BHA configuration is fixed and defined by the LWD requirements, and the mud weight cannot be lowered because of wellbore stability requirements. What actions should you take based on the chart above? Tick the correct answer(s).
Optimise the tool joint OD and ID
Optimise the bit pressure drop.
Optimise ID of the 4” drill pipe.
5. A 6” hole is planned to be drilled with a 250 GPM flow rate in a well that reaches horizontal at 5,000 ft MD. The rule of thumb for effective and efficient hole cleaning says that an annular velocity of 150 ft/min is required. This requirement is satisfied for the 6” hole section. Is it safe to assume that hole cleaning is not an issue considering that sufficient string RPM and good rheology and good wellbore stability are observed throughout this section?
Select one
Yes
No
6. While tripping out of the 8 ½” open hole you plan to lubricate out of the hole to the previous casing shoe, mitigating formation collapse risk. The swab/surge driller’s view without pumps on is presented on the image above. Inside the casing shoe, you decided to pull the string on elevators. Has the risk of collapsing 8 ½” open hole been mitigated?
Select one
Yes, we are above the sensitive zone, we can pull on elevators.
Yes, the swab EMW inside the casing is above the collapse pressure gradient.
No, we can still swab the EMW in the open hole below the collapse pressure gradient. Even tripping close to the surface.
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Hidden
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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q4
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q5
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q6
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