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, DS1, NS-1   

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'

Connection:

API Regular, H90, PAC

1.Mechanical property of slick and spiral drill collars:

 

OD Range(in):3 1/8~6 3/4  7~11

Yield Strength(MPa):>758  >689

Tensile Strength(MPa):>965 >930

Elongation(%):>13  >13

Hardness(HB):285~341  285~341

Impact Test(J):>54  >54

OD Range		Yield Strength(MPa)	Tensile Strength(MPa)	Elongation (%)	Hardness (HB)	Impact Test(J)
mm	in
79.4171.4	31/863/4	≥758	≥965	≥13	285341	≥54
177.8279.4	711	≥689	≥930	≥13	285341	≥54

2.Mechanical property of Non-mag drill collars:

 

OD Range(in):3 1/8~6 3/4  7~11

Yield Strength(MPa):>758  >689

Tensile Strength(MPa):>827  >758

Elongation(%):>18  >20

OD Range		Yield  Strength(MPa)	Tensile Strength(MPa)	Elongation (%)	Hardness (HB)	Impact Test(J)
mm	in
79.4171.4	31/863/4	≥758	≥827	≥18
177.8279.4	711	≥689	≥758	≥20