NMDC Non-Magnetic Drill Collar

Product Description

Non-Magnetic Drill Collar
Non-magnetic drill collars are made from non-magnetic materials with  low-magnetic permeability.
API monogram, serial number, OD, ID, type and size of connections are stamped on recessed mill flats.
 
OD ID Length
mm Bevel Diameter
mm Connection Bending Strength Ratio
in mm in mm    
**1/8 *9.4 **1/4 *1.8 ***0 *6.2 NC****1 2.*7: 1
**1/2 *8.9 **1/2 *8.1 ***0 *2.9 NC****5
( *1/8IF) 2.*2 :1
**1/8 **4.8 2 *0.8 ***0 **0.4 NC****1
( *7/8IF ) 2.*3 :1
**3/4 **0.7 2 *0.8 ***0 **4.7 NC****7 2.*8 :1
5 **7 **1/4 *7.2 ***0 **1.0 NC****0
( *1/2IF ) 2.*8:1
6 **2.4 **1/4 *7.2 ***0 or ***0 **4.5 NC****0 2.*9:1
              
6 **2.4 ***3/*6 *1.4 ***0 or***0 **4.5 NC****0 2.*4:1
**1/4 **8.8 **1/4 *7.2 ***0 or ***0 **9.2 NC****2 2.*1:1
**1/4 **8.8 ***3/*6 *1.4 ***0 or ***0 **0.0 NC****2 ( 4IF ) 2.*3:1
**1/2 **5.1 **1/4 *7.2 ***0 or ***0 **4.8 NC****5 ( 4IF) 2.*6:1
**1/2 **5.1 ***3/*6 *1.4 ***0 or ***0 **4.8 NC****5 ( 4IF ) 3.*5:1
**3/4 **1.4 **1/4 *7.2 ***0 or ***0 **9.5 NC****7 ( 4IF ) 3.*8:1
**3/4 **1.4 ***3/*6 *1.4 ***0 or ***0 **9.5 NC****7( *1/2IF ) 2.*7:1
7 **7.8 **1/4 *7.2 ***0 or ***0 **4.7 NC****0 ( *1/2IF ) 2.*4 :1
7 **7.8 ***3/*6 *1.4 ***0 or ***0 **4.7 NC****0( *1/2IF ) 2.*3 :1
**1/4 **4.2 ***3/*6 *1.4 ***0 or ***0 **9.5 NC****2 ( *1/2IF ) 3.*2 :1
**3/4 **6.8 ***3/*6 *1.4 ***0 or ***0 **5.3 NC****7 2.*0 :1
8 **3.2 ***3/*6 *1.4 ***0 or ***0 **0.1 NC****0 3.*2 :1
              
**1/4 **9.6 ***3/*6 *1.4 ***0 or ***0 **5.7 *5/8REG 2.*3: 1
9 **8.6 ***3/*6 *1.4 ***0 or ***0 **2.7 NC****0 3.*7 :1
**1/2 **1.3 3 *6.2 ***0 or ***0 **3.8 *5/8REG 2.*1 :1
**3/4 **7.6 3 *6.2 ***0 or ***0 **2.6 NC****7 2.*7 :1
              
*0 **4 3 *6.2 ***0 or ***0 **7.3 NC*****0 2.*1: 1
*1 **9.4 3 *6.2 ***0 or ***0 **6.7 *5/8REG 2.*4 :1
 
 

Mechanical Properties of Non-magnetic Drill Collar
 
Drill Collar O.D. Range Yield Strength
Mpa Tensile Strength
Mpa Elongation(min) with Gage Length 4 times Diameter Brinnel
Hardness (Min) Min. Charpy Impact Value Ft. lb.
mm in     
            
*9.4~**1.4 3 1/8"
~6 3/4" ≥**8 ≥**7 ≥*8 **5 *0
**7.4~**9.4 7"~ *1" ≥**9 ≥**8 ≥*0 **7 *0

Magnetic Properties of Non-magnetic Drill Collar:
When MPS=1 ×**5/4πA/m:
Relative magnetic permeability μ r ≤ 1.***0
Magnetic Field Gradient △ B ≤ 0.*5 μT