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 made of AISI 4145 H
|
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
|
|
|