Drill Collar
 

 

Product Outline

   Drill collar is an important tool that used in well drilling process for oil/gas both onshore and offshore
   Drill collar conform to latest version of API Specification 7 and other related standards. Products are authorized to use API monogram.

    Drill collars are available in standard API configurations and connections are cut in accordance with API Spec. 7 & API RP 7G requirement. Special drill collar such as for high pressure well are also available.
Technical Characteristics

1、Drill collar are made of modified alloy steel fully heat treated in order to obtain high hardness
2、Cold rolling processing the thread ends to achieve good pressure-bearing ability, anti wearing out and longer life-span.
3、Thread phosphor or copper coated to achieve good resistant-wearing ability and anti-thread gluing ability.
Screw Thread Numerical Controlled Processing
Turning External Diameter and Deep Hole Processing
Mechanical Properties
OD
in(mm)
Y.S
σ0.2
MPa
TS
σb
MPa
Elongation percent
δ4 %
Hardness
HB
Impact Ductility
AKV
J
3 1/8~6 3/4(79.4~171.5)
≥758
≥965
≥13
285~341
≥54
7~11(177.8~279.4)
≥689
≥930
Main Specification
Thread Type
OD
in(mm)
ID
in(mm)
Circular Bead Dia in(mm)
Bending Strength Ratio
Length
ft(mm)
NC44-60
6(152.4)
213/16(71.4)
5.689(144.5)
2.84∶1
30.5/31.5(9150/9450)
NC44-60
6(152.4)
21/4(57.2)
5.689(144.5)
2.49∶1
NC44-62
61/4(158.8)
5.874(149.2)
2.91∶1
NC46-62(4IF)
6 1/4(158.8)
213/16(71.4)
5.906(150.0)
2.63∶1
NC46-65(4IF)
6 1/2(165.1)
2 1/4(57.2)
6.094(154.8)
2.76∶1
NC46-65(4IF)
6 1/2(165.1)
2 13/16(71.4)
6.094(154.8)
3.05∶1
NC50-70(41/2IF)
7(177.8)
6.484(164.7)
2.73∶1
NC56-77
7 3/4(196.8)
7.295(185.3)
2.70∶1
NC56-80
8(203.8)
7.484(190.1)
3.02∶1
NC61-90
9(228.6)
8.374(212.7)
3.17∶1
NC70-97
9 3/4(247.66)
3(76.2)
9.157(232.6)
2.57∶1
NC70-100
10(254.0)
9.343(237.3)
2.81∶1
Drill Collar Heat Treatment Production Line
 

ZYZJ Petroleum Equipment Co., Ltd
Address:No.465, Daqing Road, Puyang City Henan Province, China
Post code:457001

电话:++86-0393-5380137
++86-0393-5380089
++86-0393-5380028
++86-0393-5380092
++86-0393-5380920
Fax:++86-0393-4892525
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