Product details of API Spec 7-1 standards Drilling Rig Square Kelly and Hexagonal Kelly for Sale
Kelly is the drive part of whole drill string, it transmit the torsional energy from the rotary table to the
in the bottom of the hole. The precision-machined kelly is a heavy square or hexagonal steel bar supported by the swivel through the rotary table and connected to the first joint of drill pipe in the drill string.
Our kelly has been approved by the NS-1 certification. Straightness is the key manufacturing process.
Straightness is checked before, during and after each machning operation. Flats are precision-milled to API and NS-1 specifications. All milling is performed on specially designed rigid kelly mills.Each kelly is furnished with a pressed steel thread protectors.
Features of Kelly
They are made of AISI 4142H-4145H forged or rolled alloy structural steel. Quenching plus tempering thermal treatment will be conducted over the whole length. Its Brinell hardness can reach 285-341 on
the basis of such thermal treatment. Charpy impact energy: 54J. The formulated process can ensure that the misalignment of the hole reaches the standard wall thickness.
When ordering the Kelly please specify:
1. kelly type(square or hexagonal)
2. nominal size and overall length
3. upper and lower connection
Drill Kelly: Kelly is on the top of the drill stem.Kelly is main driver of the whole drill string. It transmits drill stem weight and torsional energy from the rotary table through the drill string to the bit at the bottom of the hole. When assembled with down hole motor and Turbodrill tools, Kelly should bare the stem weight and Reverse torque,it will Measure the depth of a well and provide a circulation channel. Kelly consists of a driving part (square or hexagonal), upper joint (LH connection) and lower joint (RH connection).
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Drill Bits
Drill Machine
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Product Name: Drilling Machine Detailed product parameter description: Product model: ZOJET Z3050*16/1 Workbench size (mm): 500*630 Maximum drilling diameter (mm): 50 Distance from spindle centerline to column generatrix (mm): Maximum 1600 Minimum 350 Distance from spindle end to base working surface (mm): Maximum 1220 Minimum 315 Spindle travel (mm): 315 Horizontal moving distance of the spindle box (mm): 1250
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