General Questions With Answers - 4 -

1. On a tripping out of the hole a pill has been pumped so that the pipe pulls dry. The hole fill up has been correct for the first 9 stands. Stands # 10 and 11 take 1/3 as much mud as they should. Stands no.12 and 13 take the correct amount of mud again.

- Describe what has happened and what the driller should be concerned about.
- What should the driller's next action be .
- What are your instructions on how to proceed from here.

2. While circulating out a kick, the pumps break down. During repairing the mud pumps, the pressures on both gauges drill pipe (Pdp) and annular (Pann) have risen by 300 psi. Everything is ready to go now. How will you proceed to kill the well?

3. If shallow gas is encountered, do we :

a. Increase pump speed and activate diverter.
b. Stop pumps and activate diverter.
c. Reduce pump speed, change to sea water and activate diverter.

4. What is the difference between a square and hexagonal kelly? Which one is better and why?

5. What is the purpose of having a relief valve (safety pop off valve) on the mud pumps?

6. What are the purposes of installing a float valve when drilling top hole?

7. What type of cement would you use for setting a balance cement plug for a side track operation and explain why you would use this cement?

8. What gas is used for precharging the pulsation dampeners and to what pressure are they charged to?

9. What is the purpose of a weep hole?


1. Over stand 10 and 11 you have swabbed in some formation fluid/gas. You will be worried that it is gas and will expand on its way to surface. You will have to do a flow check and if the well is static you will have to run back to bottom. On bottom you will have to circulate bottoms up. 
Instructions : 
       1. Flowcheck 
       2. Rih carefully, be carefull, you might run the BHA assemblie in the gas and the well might kick
       3. Circulate Bottoms up, flowcheck halfway and 2/3 of the way. After Bottoms up Pooh (pull out of the hole)  
           carefully.Pump pill when at shoe.

2. Bleed annulus down till gettig the initial Pdp (Pressure on gauge after closing the well for mud pumps repair). Then continue pumping keeping Pann as Pchoke till correct pump strokes (kill rate) are achieved, than keep Pdp constant.

3. We do A. Increase the pump speed to give a higher annular pressure and to keep the hole as full as possible.

4. A square Kelly has four sides, hexagonal Kelly has eight sides. The loading on a square kelly is at four points, while on a hexagonal kelly the loading is on eight points and therefor less prone to distortion.

5. To protect the pressurised system of over pressurising, and to protect the pump of pressure failure.

6. To prevent back flow whilst drilling top hole. This is likely in top hole due to the many cuttings in the annulus.

7. Neat class "G" because this has the highest compressive strength.

8. Nitrogen is used. They are charged to 75% of the working pressure of the pump, but the maximum is 750 psi.

9. The weep hole in the BOP Rams, is there to show either a leak with the primary seals (leaks mud), or to show a leak of the piston seal (leaks accumulator fluid)

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