Drill Collar
- Hardness range of 285 to 341 BHN and a charpy impact value of 40ft/lbs are guaranteed for evenly distributed 16 points in any cross sections at room temperature.
- Pressed steel thread protectors are supplied to all drill collar that are equipped with standard connections.
- Manufactured strictly according to standard.
- Widely used in oil, gas, HDD and geothermal field.
- Technical Specification
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Drill Collar
Drill Collars are integral heavy-wall joints that are manufactured from a solid bar of modified alloy steel. The solid bars are quenched and tempered to obtain the required mechanical properties, then trepanned, drifted and threaded. All drill collars are heat-treated with hardness within 285 to 341 BHN, which are guaranteed one inch below the surface of the pipe.
Lake Petro could supply slick type drill collar, spiral drill collar and Non-magnetic drill collar (NMDC).
| Number and connection table | Outside Diameter | Inside Diameter | Length | Bevel Diameter | Bending Strength Ratio | ||
| mm | in | mm | in | mm | mm | ||
| NC23-31 | 79.4 | 3-1/8 | 31.8 | 1-1/2 | 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 or 9450 | 144.5 | 2.49:1 |
| NC44-60 | 152.4 | 6 | 71.4 | 2-13/16 | 9150 or 9450 | 144.5 | 2.84:1 |
| NC44-62 | 158.8 | 6-1/4 | 57.2 | 2-1/4 | 9150 or 9450 | 149.2 | 2.91:1 |
| NC44-62 (4 IF) | 158.8 | 6-1/2 | 71.4 | 2-13/16 | 9150 or 9450 | 150 | 2.63:1 |
| NC44-65 (4 IF) | 165.1 | 6-1/2 | 57.2 | 2-1/4 | 9150 or 9450 | 154.8 | 2.76:1 |
| NC44-65 (4 IF) | 165.1 | 6-1/2 | 71.4 | 2-13/16 | 9150 or 9450 | 154.8 | 3.05:1 |
| NC44-67 (4 IF) | 171.4 | 6-3/4 | 57.2 | 2-1/4 | 9150 or 9450 | 159.5 | 3.18:1 |
| NC50-67 (4-1/2IF) | 171.4 | 6-3/4 | 71.4 | 2-13/16 | 9150 or 9450 | 159.5 | 2.37:1 |
| NC50-70 (4-1/2IF) | 177.8 | 7 | 57.2 | 2-1/4 | 9150 or 9450 | 164.7 | 2.54:1 |
| NC50-70 (4-1/2IF) | 177.8 | 7 | 71.4 | 2-13/16 | 9150 or 9450 | 164.7 | 2.73:1 |
| NC50-72 (4-1/2IF) | 184.2 | 7-1/4 | 71.4 | 2-13/16 | 9150 or 9450 | 169.5 | 3.12:1 |
| NC56-77 | 196.8 | 7-3/4 | 71.4 | 2-13/16 | 9150 or 9450 | 185.3 | 2.70:1 |
| NC56-80 | 203.2 | 8 | 71.4 | 2-13/16 | 9150 or 9450 | 190.1 | 3.02:1 |
| 6-5/8 REG | 209.6 | 8-1/4 | 71.4 | 2-13/16 | 9150 or 9450 | 195.7 | 2.93:1 |
| NC61-90 | 228.6 | 9 | 71.4 | 2-13/16 | 9150 or 9450 | 212.7 | 3.17:1 |
| 7-5/8 REG | 241.3 | 9-1/2 | 76.2 | 3 | 9150 or 9450 | 223.8 | 2.81:1 |
| NC70-97 | 247.6 | 9-3/4 | 76.2 | 3 | 9150 or 9450 | 232.6 | 2.57:1 |
| NC70-100 | 254 | 10 | 76.2 | 3 | 9150 or 9450 | 237.3 | 2.81:1 |
| 8-5/8 REG | 279.4 | 11 | 76.2 | 3 | 9150 or 9450 | 266.7 | 2.84:1 |
| Slips and elevator grooves can be produced upon the customers’ requirements. | |||||||
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Buyer’s Guide
Please send us your inquiry with detail item description or with Model number. If there is no packing demand we take it as our regular exported standard packing. We will offer you an order form for filling. We will recommend you the most suitable model according to information you offered.
We can give you really high quality products with competitive price. We have a better understanding in Chinese market, with us your money will be safe.
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Lake Petro is located in Dongying City, which is famous for Shengli Oilfield and the largest manufacturing hub of petroleum equipment in China. Following the principle of “quality first, science and technology innovated, people oriented”, every Lake Petro person is sparing no effort to provide the customers with best products and services. Our products are based on advanced production line and testing equipment, our products are designed and manufactured according to certification of ISO, GOST, etc.