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DRILL COLLAR

DRILL COLLAR
DRILL COLLAR

Product Description

Usage :
One of the most important components of the drill string is to provide drilling bit of pressure and the drill string rigid role.
Standard :
API 7, API 7-1 and SY/T standards.
Material :
AISI 4145 H or Non-magnetic material.
Types:
Slick drill collars / Spiral drill collars / Non-mag material drill collars
Size :
OD : 3 1/8”---11”, Length : 10’---31’
Mechanical Property:
Mechanical Property of Slick and Spiral drill collars:

OD Range Yield Strength(MPa) Tensile Strength(MPa) Elongation (%) Hardness (HB) Impact Test(J)
mm in
79.4~171.4 31/8~63/4 ≥758 ≥965 ≥13 285~341 ≥54
177.8~279.4 7~11 ≥689 ≥930 ≥13 285~341 ≥54

Mechanical Property of Non-mag Drill Collars
OD Range Yield  Strength(MPa) Tensile Strength(MPa) Elongation (%) Hardness (HB) Impact Test(J)
mm in
79.4~171.4 31/8~63/4 ≥758 ≥827 ≥18    
177.8~279.4 7~11 ≥689 ≥758 ≥20    
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