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Help CenterDrill Collar API SPEC7-1/7-2
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Specifications
1) Certificate: API 7-1, API Q1, ISO9001
2) OD: 104.8-228.6mm
3) Length: 9150/9140
4) Material: AISI4145H mod or Non-magnetic
1) Certificate: API SPEC 7-1, API SPEC 7-2, API Q1, ISO9001
2) OD: 104.8-228.6mm
3) Length: 9150/9140
4) Material: AISI4145H mod or Non-magnetic
Usage:
It’s one of the most important elements of drill stem. It can provide drilling pressure to the bit and improve drill stem rigid.
Effectively control the trace element of the material which was selected with high quality and unique method. Adopt special intermediate frequency heat treatment method and advanced ultrasonic and magnetic particle inspection method and holding higher mechanical property. According to the shape and material dill collar was divided into three forms:
1. Type A (cylindrical): To be made of ordinary alloy steel, with circular cross section inside and outside the drill collar.
2. Type B (Spiral): To be made of ordinary alloy steel, with spiral grooves on the outer surface of drill collar.
3. Type C (Nonmagnetic): To be made of low magnetic permeability alloy steel, with circular cross section inside and outside the drill colla
Nominal size | OD | ID | L
mm | bevel diameter | Bending strength ratio | ||
mm | in | mm | in | ||||
NC23-31 | 79.4 | 3 1/8 | 31.8 | 1 1/4 | 9150 | 76.2 | 2.57:1 |
NC26-35(2 3/8 IF) | 88.9 | 3 1/2 | 38.1 | 1 1/2 | 9150 | 82.9 | 2.42:1 |
NC31-41(2 7/8 IF) | 104.8 | 4 1/8 | 50.8 | 2 | 9150 | 100.4 | 2.43:1 |
NC35-47 | 120.6 | 4 3/4 | 50.8 | 2 | 9150 | 114.7 | 2.58:1 |
NC38-50(3 1/2 IF) | 127 | 5 | 57.2 | 2 1/4 | 9150 | 121 | 2.38:1 |
NC44-60 | 152.4 | 6 | 57.2 | 2 1/4 | 9150&9450 | 144.5 | 2.49:1 |
NC44-60 | 152.4 | 6 | 71.4 | 2 13/16 | 9150&9450 | 144.5 | 2.84:1 |
NC44-62 | 158.8 | 6 1/4 | 57.2 | 2 1/4 | 9150&9450 | 149.2 | 2.91:1 |
NC46-62(4 IF) | 158.8 | 6 1/4 | 71.4 | 2 13/16 | 9150&9450 | 150 | 2.63:1 |
NC46-65(4 IF) | 165.1 | 6 1/2 | 57.2 | 2 1/4 | 9150&9450 | 154.8 | 2.76:1 |
NC46-65(4 IF) | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150&9450 | 154.8 | 3.05:1 |
NC46-67(4 IF) | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150&9450 | 159.5 | 3.18:1 |
NC50-67(4 1/2 IF) | 171.4 | 6 3/4 | 71.4 | 2 13/16 | 9150&9450 | 159.5 | 2.37:1 |
NC50-70(4 1/2 IF) | 177.8 | 7 | 57.2 | 2 1/4 | 9150&9450 | 164.7 | 2.54:1 |
NC50-70(4 1/2 IF) | 177.8 | 7 | 71.4 | 2 13/16 | 9150&9450 | 164.7 | 2.73:1 |
NC50-72(4 1/2 IF) | 184.2 | 7 1/4 | 71.4 | 2 13/16 | 9150&9450 | 169.5 | 3.12:1 |
NC56-77 | 196.8 | 7 3/4 | 71.4 | 2 13/16 | 9150&9450 | 185.3 | 2.70:1 |
NC56-80 | 203.2 | 8 | 71.4 | 2 13/16 | 9150&9450 | 190.1 | 3.02:1 |
6 5/8 REG | 209.6 | 8 1/4 | 71.4 | 2 13/16 | 9150&9450 | 195.7 | 2.93:1 |
NC61-90 | 228.6 | 9 | 71.4 | 2 13/16 | 9150&9450 | 212.6 | 3.17:1 |
7 5/8 REG | 241.3 | 9 1/2 | 76.2 | 3 | 9150&9450 | 223.8 | 2.81:1 |
NC70-97 | 247.6 | 9 3/4 | 76.2 | 3 | 9150&9450 | 232.8 | 2.57:1 |
NC70-100 | 254 | 10 | 76.2 | 3 | 9150&9450 | 237.3 | 2.81:1 |
8 5/8 REG | 279.4 | 11 | 76.2 | 3 | 9150&9450 | 266.7 | 2.84:1 |
Shandong Mingzhu petroleum Equipment Co.,Ltd. Is a preofessional petroleum equipment manufacture enterprise,which integrates R & D with production,sales and service. It is located in the beautiful Yellow River estuary where is called “Oil City”----Dongying,Shandong.
We set special R&D center in our company and have strong teams with dozens of senior engineer, general engineer, senior technician and many skilled workers.
Our experts focus their efforts on R&D of product performance and new material to make products be more resistant to torsion and sulfur. we are always insisting that survive by quality, develop by credibility. We have received the following certificate: API Q1, API SPEC 5DP, API SPEC 55CT, API SPEC7-1, ISO/TS 29001,ISO9001,ISO 14001,OHSAS 18001,GOST,RTN AND HSE standard certificates awarded by CNPC and Sinopec. Snandong mingzhu would work with our clients all over the world to create a better prospect of business.
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