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Drill String Kelly

Country/Region china
Company Beijing Olymtech Developmemt Co. ,Ltd
Categories Drilling String
Telephone 6221 21282145
ICP License Issued by the Chinese Ministry
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Drill String 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. 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.

Kelly has been approved by API Spec 7 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 specifications. All milling processes are performed on specially designed rigid Kelly mills to ensure tight tolerances and high quality drive sections. Each Kelly is furnished with a pressed steel thread protectors.

Square Kelly and Hexagonal Kelly

Features and Benefits

  • 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 specifications;
  • Inspected ultrasonically over the full length and section;
  • Shipped in a protective steel-cased scabbard;

When ordering Please specify:

  • Kelly type (square or hexagonal);
  • Nominal size and overall length;
  • Upper and lower Connections.
  • Connection size and type
  • Thread protector type
Quality Drill String Kelly for sale
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