Fun and Games | Merlin ERD

Take The New TDH Software Quiz!

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?

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?

3. The chart above shows a slack-off weight for a floated casing run. At what depth has the floatation collar been installed?

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?

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?