Dull Bit Condition

1. A bit was pulled out after drilling 1000 m in 80 hrs. The driller reported the bit dull bit condition of Bit as T5.It means 5/8 of total height of bit teeth is

a. Remainingb. Gone or exhaustedc. 50 % height is goned. None of the above

2. A bit was pulled out. Driller jumbled up the reporteddull condition of bit as follows:Dull condition-BT, Outer rows cutter wear-6, Location-A, Inner rows cutter wear-4, Other dull condition-PN, Reason for POOH-ROP, Bearing wear-E, Gauge wear-1/16”Please help the driller in reporting dull condition correctly in each column the table given below:

1 2 3 4 5 6 7 8Cutter structure condition

3. The driller measured the gauge wear in a 8-1/2” roller bit

Pulled out after drilling abrasive sand for 300 m depth. When he measured bit, he found measured distance on the third roller 3/16”. What is the actual undergauge of bit:

a. 3/16”b. 2/16”c. 9/32”d. 1/16”

4. A bit was pulled out and the condition of teeth/ inserts is as shown in picture. Please specify the condition of

inserts that are pointed by arrow:a. Broken teeth (BT)b. Chipped teeth (CT)c. Lost teeth (LT)d. Worn teeth (WT)

5. A driller pulled out 1-3-5 IADC code bit after drilling only 150 metres in 50 hours and the condition of the pulled out bit is as shown in the picture. What new bit would you run:

a. Run the new bit of 1-3-5 IADC code b. Run the new bit of 1-1-5 IADC code

3/16”

c. Run the new bit of 2-1-5 IADC code