1. API 5D API SPEC 7 API RP 7G 2. Size from 3-1/8" to 11" 3. Drill collars are manufactured from AISI 4145H modified steel,

Features

1.Minimize the potential for differential sticking with Parveen's Spiral Drill Collars. They reduce the amount of contact between the drill collar and the wall of hole.2. Low permeability, high mechanical properties and superior resistances to corrosion cracking.3. Display high strength and low permeability throughout the product.

4.Resistance to corrosion can be demonstrated by subjecting materials from each Drill Collar to the corrosion test as specified in ASTM A262 practice.5. Drill collar bodies are inspected ultrasonically full length over the circumference of the body before boring. Examination Techniques are specified in ASTM E114(direct contact method) and ASTM E214 and / or ASTM E1001 (immersion method).

9 1/2" Spiral Drill Collar( Apispec7) Aisi4145h Alloy Steel