CHINA SCOTON OILFIELD EQUIPMENT CO., LTD.
Kelly is main driver of the whole drill string, it transmits torsional energy from the rotary table through the drill string to the bit at the bottom of the hole. SCOTON Kelly drilling system is a long square or hexagonal, precision machined heavy steel bar that is supported by the swivel through the rotary table and is connected to the first joint of drill pipe in the drill string.

SCOTON's Kelly drive drilling has been approved by NS-1 certification. Straightness of the Kelly is very crucial in the manufacturing process, thus straightness inspections are carried out before.during and after each machining operation. The flats are precision-milled to API and NS-1 specifications. All milling processes are performed on specially designed rigid Kelly mills to ensure tight tolerances and high quality drive sections. Each SCOTON Key is furnished with a pressed steel thread protectors.

Features and Benefits of Kelly

  • Manufactured from AISI 4145H-modified,fully heat-treated alloy steel with a Brinell Hardness range of 285-341 and a minimum average Charpy impact value of 40 ft-lbs;
  • Ends and drive sections, IDs and connections machined and inspected to API and NS-1 specifications;
  • Inspected ultrasonically over the full length and section;
  • Shipped in a protective steel-cased scabbard

Specifications of Square Kelly  S04 & Hexagonal Kelly  S06

Nom

Size

(in)

Square Kelly
Product Code

HexagonalKelly
Product Code

Top Connection (LH)

Bottom
Connection

ID(in)

Drive
section
(in)

Standard O.D(in)

Optional O.D(in)

Square

O.D(in)

HEX.

O.D(in)

Square

HEX.


A

B

2 1/2

S04-130000


6 5/8REGHL 7 3/4

4 1/2REGLH 53/4

NC26 85.7


1 1/4


3 1/4


3

S04-130100

S06-130000

6 5/8REGHL 7 3/4

4 1/2REGLH 53/4

NC31 4 1/8

NC26

1 3/4

1 1/4

3 3/8

3 3/8

3 1/2

S04-130200

S06-130100

6 5/8REGHL 7 3/4

4 1/2REGLH 53/4

NC38 4 3/4

NC31

2 1/4

1 3/4

4 7/16

4

4 1/4

S04-130300

S06-130200

6 5/8REGHL 7 3/4

4 1/2REGLH 53/4

NC46 6 1/4

NC38

2 13/16

2 1/4

5 1/2

4 4/5

S04-130400

S06-130300

6 5/8REGHL 7 3/4

4 1/2REGLH 53/4

NC50 6 3/8

NC46

2 13/16

2 1/4

5 1/2

4 4/5

5 1/5

S04-130500

S06-130400

6 5/8REGHL 7 3/4


5 1/2 FH 7

NC46

3 1/4

3

6 3/4

5 29/32

S04-130600

S06-130500

6 5/8REGHL 7 3/4


NC56 7

NC50

3 1/4

3 1/4

6 3/4

5 29/32

6


S06-130600

6 5/8REGHL 7 3/4



5 1/2 FH 7


3 1/2


6 13/16


S06-130700

6 5/8REGHL 7 3/4



NC56 7


3 1/2


6 13/16

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