Drilling Collar

ZT series Drilling Collar are used for push the drilling bits during drilling operation. Suitable for onshore or offshore drilling operations.

Details

The ZT series drilling collars were developed to provide the market with more reliable technology and more hoisting performance. Manufactured strictly according to API Spec7-1 standard with material of AISI 4145 Mod. Multiple choices, such as slick drill collars, spiral drill collars, non-magnetic drill collars and other types. Included but not limited by the advantages mentioned, ZT series drilling collars might be your best choice.

 

General Features

•  Manufactured according to API 7-1
•  Suitable for onshore or offshore rigs
•  Suitable for cold area and desert environment

 

Main aramaters

Size: 3-1/8” – 11” (79.4 mm – 279.4 mm)

   

Parameters:

Model D d L(mm) DF(mm) Bending Strength ratio Drill Collar
mm in mm in Nominal size
ZT 3-1/8 79.4 3-1/8 31.8 1-1/2 9,150 76.2 2.57:1 NC23-31
ZT 3-1/2 88.9 3-1/2 38.1 1-1/2 9,150 82.9 2.42:1 NC26-35(2-3/8IF)
ZT 4-1/8 104.8 4-1/8 50.8 2 9,150 100.4 2.43:1 NC31-41(2-7/8IF)
ZT 4-3/4 120.7 4-3/4 50.8 2 9,150 114.7 2.58:1 NC35-47
ZT 5 127 5 57.2 2-1/4 9,150 121 2.38:1 NC38-50(3-1/2IF)
ZT 6A 152.4 6 57.2 2-1/4 9,150/9,450 144.5 2.49:1 NC44-60
ZT 6B 152.4 6 71.4 2-13/16 9,150/9450 144.5 2.84:1 NC44-60
ZT 6-1/4A 158.8 6-1/4 57.2 2-1/4 9,150/9,450 149.2 2.91:1 NC44-62
ZT 6-1/4B 158.8 6-1/4 71.4 2-13/16 9,150/9,450 150 2.63:1 NC46-62(4IF)
ZT 6-1/2A 165.1 6-1/2 57.2 2-1/4 9,150/9,450 154.8 2.76:1 NC46-65(4IF)
ZT 6-1/2B 165.1 6-1/2 71.4 2-13/16 9,150/9,450 154.8 3.05:1 NC46-65(4IF)
ZT 6-3/4A 171.4 6-3/4 57.2 2-1/4 9,150/9,450 159.5 3.18:1 NC46-67(4IF)
ZT 6-3/4B 171.4 6-3/4 71.4 2-13/16 9,150/9,450 159.5 2.37:1 NC50-67(4-1/2IF)
ZT 7A 177.8 7 57.2 2-1/4 9,150/9,450 164.7 2.54:1 NC50-70(4-1/2IF)
ZT 7B 177.8 7 71.4 2-13/16 9,150/9,450 164.7 2.73:1 NC50-70(4-1/2IF)
ZT 7-1/4 184.2 7-1/4 71.4 2-13/16 9,150/9,450 169.5 3.12:1 NC50-72(4-1/2IF)
ZT 7-3/4 196.8 7-3/4 71.4 2-13/16 9,150/9,450 185.3 2.70:1 NC56-77
ZT 8 203.2 8 71.4 2-13/16 9,150/9,450 190.1 3.02:1 NC56-80
ZT 8-1/4 209.6 8-1/4 71.4 2-13/16 9,150/9,450 195.7 2.93:1 6-5/8REG
ZT 9 228.6 9 71.4 2-13/16 9,150/9,450 212.7 3.17:1 NC61-90
ZT 9-1/2 241.3 9-1/2 76.2 3 9,150/9,450 223.8 2.81:1 7-5/8REG
ZT 9-3/4 247.6 9-3/4 76.2 3 9,150/9,450 232.6 2.57:1 NC70-97
ZT 10 254 10 76.2 3 9,150/9,450 237.3 2.81:1 NC70-100
ZT 11 279.4 11 76.2 3 9,150/9,450 266.7 2.84:1 8-5/8 REG

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