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Spiral Drill collar

1. The major function of spiral drill collar: It is to prevent drilling tools from pressure differential block during drilling, the spiral groove allows the mud flow freely around the drill collar to balance pressure preventing pressure block, so effectively avoid bit sticking from differential pressure. Spiral collar can also reduce the contact area between the wall and tubular body, so as to avoid from sticking phenomenon of drill string.

2、Regular spiral drill collar materials: 4145H or 4145H MOD

3、Regular spiral drill collar is B type

4、Optional Structure : Spiral groove, elevator groove, slips groove, stress groove, and hard-banding

5、spiral drill collar Production standard: API 7-1, API7-2 and NS-1

Why Choose our spiral drill collar?

1. With the sufficient mill spiral machines, hole-drilling machines, and digital control machines, greatly meet the production requirements.
2. All raw materials are inspected well to ensure production performance qualification by the various laboratory machines. 
3. Our company, with strong development ability, can improve and design special structure as per user special need on the production standard basis. 
4. With special cold-rolling machines and break-up and break-out machines, our company can independently achieve thread, stress relief groove, and thread running operations.

spiral drill collar Specification

1. Provide the spiral drill collar’s specification: O.D (specification)
2. Provide the overall length (if non-standard)
3. Provide the inner bore size (if non-standard)
4. Provide connection type and model: thread type and whether have stress groove or not, bench mark or choosing low torque structure. 
5. Whether have the elevator groove, slips groove, hard-banding or undercoat (Optional)
6. Whether have thread, and have the shackle requirements of stress relief groove cold rolled stress or thread；