Questions on Bit Selection & Classification : SKS / 110310

Question 1 : Second digit in Roller Bit Classification is :

(a) Cutting Structure Type(b) Cutting Structure Series(c) Bearing type (d) Alphabetic : Special Features

Question 2 : While drilling 12¼” phase, formation having compressive strength less than 4000 psi, which roller bit combination would you prefer most :

(a) 1 - 1 & 4 - 2 Series (b) 1 - 2 & 4 - 3 Series (c) 1 - 3 & 5 - 1 Series (d) 3 - 4 & 7 - 3 Series

Question 3 : Which statement is correct reg. Roller Bit Classification :

(a) 1-4-1 is softer than 1-3-1 (b) 1-2-1 is harder than 2-1-1 (c) 2-2-1 is softer than 2-1-1 (d) 3-1-1 is harder than 2-4-1

Question 4 : Rate Contract for procurement of Bits on consignment basis has been finalized recently for all work centers of ONGC for next 3 years with following company :

(a) RBI - Gearhart (b) Reed - Hycalog (c) Smith International Inc. (d) Drillbit International

Question 5 : Name the propriety software for “log based bit selection” being used by leading bit manufacturer M/s Smith International Inc. :

a) RSA b) OASIS c) DBOS d) ROCKY

Question 6 : 5-3-7-Y Roller Bit has special following feature :

(a) Chisel Tooth Insert (b) Enhanced C/S

(c) Conical Tooth Insert(d) Other Shape Inserts

Question 7 : While drilling 8½” phase, formation encountered is mainly Sand / Sandstone, having compressive strength around 7000psi, which PDC bit would you prefer most :

(a) S 221(b) M 221(c) M 323(d) S 323

Question 8 : In 8-digit dull-bit grading system, if a driller writes 8th digit as TW, then what exactly he means :

(a) TD reached(b) Twist-off(c) Torque(d) Washout in drill string

Answers :

S. No. Answer S. No. Answer

1. a 5. c

2. a 6. c

3. d 7. b

4. c 8. b