CDS® Double-Shoulder Connection
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The CDS® connection adds a secondary shoulder that provides 11% to 49% more torque than API single-shoulder connections of the same dimensions. The secondary shoulder acts as a mechanical stop, reducing internal stresses in the pin and box and allowing better performance in deep or highly deviated wells.
Advantages
- Reach total depth faster
- Fully interchangeable with API numbered and API double-shoulder connections
- NS-1 approved double-shoulder connection
- Smooth, larger ID for improved hydraulic efficiency; prevents cement and debris lodging in the tool joint
- Smaller OD / larger ID than API connections of equivalent torque capacity
Performance data
| Connection | Tool joint OD (in) | Tool joint ID (in) | Recommended make-up torque (ft-lbs) | Tensile strength (lbs) | Torsional strength (ft-lbs) |
|---|---|---|---|---|---|
| CDS 238PAC | 2 7/8 | 1 1/2 | 4,100 | 215,000 | 6,300 |
| CDS 238SLH90 | 3 1/8 | 1 1/2 | 7,700 | 238,000 | 11,800 |
| CDS 278PAC | 3 1/8 | 1 1/2 | 5,900 | 288,600 | 9,100 |
| CDS 26 | 3 3/8 | 1 3/4 | 5,600 | 319,100 | 9,300 |
| CDS 278AOH | 3 7/8 | 2 1/8 | 8,700 | 378,800 | 13,400 |
| CDS 278SLH90 | 3 7/8 | 2 1/8 | 10,500 | 417,300 | 16,100 |
| CDS 31 | 4 1/8 | 2 | 11,800 | 524,100 | 18,600 |
| CDS 38 | 4 7/8 | 2 9/16 | 17,600 | 687,400 | 27,700 |
| CDS 40 | 5 1/4 | 2 11/16 | 22,500 | 824,100 | 35,400 |
| CDS 46 | 6 1/4 | 3 1/4 | 30,100 | 957,200 | 46,300 |
| CDS 50 | 6 5/8 | 3 1/2 | 42,100 | 1,181,600 | 64,800 |
| CDS 55 | 7 | 4 | 50,500 | 1,348,300 | 79,000 |
| CDS 65 | 8 | 4 7/8 | 80,700 | 1,791,000 | 126,400 |
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