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  Kellys

  The main function of Kelly is to make the rotation of the rotary table into the drill string and bit rotation, with broken formation, namely the transmission torque and carry the full weight of the drill string. Lake Petros Kellys are made from 4145H modified alloy steel in accordance with API Spec.7-1 latest edition, which are quenched and tempered along full length. A hardness range of 285 to 341 BHN and a minimum impact value of 54 Joules as per ASTM A 370 Charpy-V. These values are guaranteed one inch below the surface. Lake Petro can supply Square Kelly and Hexagonal Kelly.
  Lake Petros kelly bars are inspected by an ultrasonic unit over their full length and full section. The wall thickness of each flat of the drive section is verified ultrasonically. All kellys connections are fitted with pressed steel thread protectors on both ends and each Kellys would be shipped with steel scabbard for marine transportation.

Kelly Size

Length (mm)

Upper Box Connection

Lower Pin Connection

I.D

(mm)

Driving Section

mm

in

Type(LH)

O.D. (mm)

Cross Flat (mm)

For Square (mm)

Cross Corner for Hex (mm)

Std

Optional

Std

Optional

Thread

O.D(mm)

63.5

2-1/2

12.19

6-5/8

REG

4-1/2

REG

196.8

146

85.7

31.8

63.5

83.3

76.2

3

12.19

6-5/8

REG

4-1/2

REG

196.8

146

NC26

104.8

44.4

76.2

100

85.7

88.9

3-1/2

12.19

6-5/8

REG

4-1/2

REG

196.8

146

NC31

120.6

57.2

88.9

115.1

100.8

108

4-1/4

12.9

6-5/8

REG

4-1/2

REG

196.8

146

NC38

158.8

71.4

108

141.3

122.2

NC38

161.9

71.4

108

141.3

122.2

133.4

5-1/4

12.9

6-5/8

REG

4-1/2

REG

196.8

146

NC46

177.8

82.6

133.3

175.4

151.6

NC50

177.8

82.6

133.3

175.4

151.6

152.4

6

12.9

6-5/8

REG

196.8

146

5-1/2FH

152.4

173

NC56

152.4

173

 

 
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