Kelly

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)
Nom Size (in)	Square Kelly Product Code	HexagonalKelly Product Code	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
4 1/4	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
5 1/5	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
6		S06-130700	6 5/8REGHL 7 3/4			NC56 7		3 1/2		6 13/16

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Kelly

Under Reamer

Drill Collar

Features and Benefits of Kelly

Specifications of Square Kelly S04 & Hexagonal Kelly S06