Please i need all the answers for these questions. ( petroleum engineering) (5pt

Question

Please i need all the answers for these questions. ( petroleum engineering) (5pts) (T/F) It is more important to have a clean wellbore prior to tripping out for a bit, than it would be if you were tripping out to run casing. 8. 9. (5pts) What is the purpose of the "junk slot" in a drill bit?. 10. (10pts) Calculate the Pipe-Hole Area Ratio (PHAR) of the following ERD wells and specify the recommended minimum drill string rotation speed. a. 8-1/2" hole with 5" drill pipe b. 12-3/8" hole with 5" drill pipe 11. (10pts) For the two scenarios, calculate the minimum mud flow rate in GPM so an annular velocity of 150fpm can be achieved and efficiently clean the wellbore. a. 8-1/2" hole with 5" drill pipe b. 12-3/8" hole with 5" drill pipe

Explanation / Answer

Answer- It is true that it is very important to clean wellbore prior to tripping out for bit. if you were tripping out to run casing. it removes the debris during various drilling operation like displacment, completion and intervention operation.

Answer- Junk slot is used in various Polycrystalline Diamond coring (PDC) drilling bit. Junk slot promote

- cuttings migration from bit face and also

- improve cutting evacuation into annulus

- it provide area for hole cleaning and

- provide the least obstruction during tripping out

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