KELLY ( SQUARE AND HEXAGONAL)
- PRODUCT DETAIL
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. The kelly 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.
The kelly 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 tolerance and high quality drive sections. Each kelly is furnished with a pressed steel thread protector.
Features and Benefits:
● Manufactured from AISI 4145H modified, fully heat treated alloy steel with a brinell hardness range of 285-341BHN and a minimum average Charpy impact value of 40ft-lbs;
● Ends and drive sections, IDs and connections machined and inspected to API and NS-1 specifications;
● Ultrasonic inspection is performed on all sections;
● Shipped in a protective steel-cased scabbard.
Main Technical Parameters
|
Kelly Size (In) |
Length (In) |
Upper Box Connection |
Lower Pin Connection |
I.D. (mm) |
Driving Section |
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|
Type(LH) |
O.D. |
Cross Flat (mm) |
For Square (mm) |
Cross Corner for Hex |
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|
Standard |
Optional |
Standard (mm) |
Optional (mm) |
Thread |
O.D. (mm) |
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|
2/1/2 |
12.19 |
6-5/8REG |
4-1/2REG |
196.8 |
146 |
85.7 |
31.8 |
63.5 |
83.3 |
||
|
3 |
12.19 |
6-5/8REG |
4-1/2REG |
196.8 |
146 |
NC26 |
104.8 |
44.4 |
76.2 |
100 |
85.7 |
|
3/1/2 |
12.19 |
6-5/8REG |
4-1/2REG |
196.8 |
146 |
NC31 |
120.6 |
57.2 |
88.9 |
115.1 |
100.8 |
|
4/1/4 |
12.9 |
6-5/8REG |
4-1/2REG |
196.8 |
146 |
NC38 |
158.8 |
71.4 |
108 |
141.3 |
122.2 |
|
NC38 |
161.9 |
71.4 |
108 |
141.3 |
122.2 |
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|
5/1/4 |
12.9 |
6-5/8REG |
4-1/2REG |
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 |
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|
6 |
12.9 |
6-5/8REG |
196.8 |
146 |
5-1/2FH |
152.4 |
173 |
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|
NC56 |
152.4 |
173 |
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