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Drill Collar
Drill Collar
A drill collar, a kind of oil drilling equipment, is widely used in the oil industry. As an experienced drill collar manufacturer in China, we provide two types of drill collar, which are common drill collar and spiral drilling collar.
Common Drill Collar
Our common drill collar is designed to provide bit weight to drill bit so that drill pipe is in tension. It can keep drill bit centralized and hole track by high rigidity. Our drill collars are strictly manufactured in accordance with API Spec.7 and SY5144 standard.
Technical Specification of Common Drill Collar
| Drill Collar Number | O.D. | I.D. | Length (mm) | Bevel Diameter | Ref bend g Strength ratio | ||
| mm | in | mm | in | ||||
| 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) | 127.0 | 5 | 57.2 | 2 1/4 | 9150 | 121.0 | 2.38:1 |
| NC44-60 | 152.4 | 6 | 57.2 | 2 1/4 | 9150, 9450 | 144.5 | 2.49:1 |
| NC44-62 | 158.8 | 6 1/4 | 57.2 | 2 1/4 | 9150, 9450 | 149.2 | 2.91:1 |
| NC46-62(4IF) | 158.8 | 6 1/4 | 71.4 | 2 13/16 | 9150, 9450 | 150.0 | 2.63:1 |
| NC46-65(4IF) | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150, 9450 | 154.8 | 3.05:1 |
| NC46-67(4IF) | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150, 9450 | 159.5 | 3.18:1 |
| N50-67(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 |
Spiral Drill Collar
Our spiral drill collar is for reducing contact area with hole to efficiently avoid bit sticking from differential pressure. Our spiral drill collars are made according to API Spec.7 and Standard SY5144. All mechanical properties of our spiral drill collar meet the above standards.
Specifications of Spiral Drill Collar
| O.D. | Cutting depth | Lead±25.4 | ||
| Mm | in | A(mm) | B(mm) | mm |
| 86 | 3 3/8 | 3.5±0.79 | 679 | |
| 98.4 | 3 7/8 | 4.0±0.79 | 914 | |
| 101.6~111.1 | 4~4 1/8 | 4.8±0.79 | 914 | |
| 114.3~130.2 | 4 1/2~5 1/8 | 5.6±0.79 | 965 | |
| 133.4~146.1 | 5 1/4~5 3/4 | 6.4±0.79 | 1067 | |
| 149.2~161.9 | 5 7/8~6 3/8 | 7.1±1.59 | 1067 | |
| 165.1~177.8 | 6 1/2~7 | 7.9±1.59 | 1168 | |
| 181.0~200.0 | 7 1/8~7 7/8 | 8.7±1.59 | 5.6±0.79 | 1626 |
| 203.2~225.4 | 8~8 7/8 | 9.5±1.59 | 6.4±0.79 | 1727 |
| 228.6~250.8 | 9~9 7/8 | 10.3±2.37 | 7.1±1.59 | 1829 |
| 254.0~276.2 | 10~10 7/8 | 11.1±2.37 | 7.9±1.59 | 1930 |
| 279.4 | 11 | 11.9±2.37 | 8.7±1.59 | 2032 |
Rugao Yaou Company is an experienced drill collar manufacturer and supplier in China. Our oil drilling equipment has been proven for reliability and durability on many large oil fields around the world. In addition to oil drill, drill rig parts, well cement tools, we also offer shearing machines, rolling machines and hydraulic presses to suit your different needs.
If you are interested in our oil drilling equipment, please feel free to contact us.
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- Drill Pipe
We are a drill pipe manufacturer and supplier in China. Our drill pipe is a piece of oil drilling equipment that is made in accordance with API 5D, API SPEC 7 Standards. The material of drill pipe body is chosen by the 1 and 3 group of API 5D. (Group 1-Grade E75; Group 3-Grade X95, G105, S135).
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- Drill Stabilizer
A drill stabilizer is a piece of oil drilling equipment. As a renowned drill stabilizer manufacturer in China, we produce our integral blade stabilizers in accordance with API Spec.7. Integral 3-spiral blade stabilizer and integral 4-spiral blade stabilizer (string type, near bit type) are available.