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 |
|
|
|
