Double Shoulder Drill Pipe Connection
Double Shoulder Connections
Double Shoulder Connections are particularly suited for difficult operations, such as extended and deep drilling, horizontal and slim hole wells. TPS-DS (Double Shoulder) offers many advantages compared to Standard API Drill Pipe connections.
Key facts and advantages:
- Fully interchangeable with API NC or FH connections
- Increased torque capacity and hydraulic efficiency
- Extended product life time
Improved safety & performance
Due to higher torque capacity
Increased torque capacity
Thanks to a second, internal shoulder, the torque distribution throughout the connection is improved.This enables the connection to cope with higher torsional loads.
Compatible with API connections
TPS-DS connections are fully interchangeable with API NC or FH connections. Please see below table for more info. During make-up with standard connections, the internal shoulder of TPS-DS will not get in contact with the back of the API connection. This means that you can still use existing BHA equipment (Please consider that the performance is limited to the properties of the weaker connection in such cases).
|TPS-DS connection||Compatible API connection|
|TPS-DS SLH||2 3/8 SLH90|
|TPS-DS 55||5 ½ FH|
The same equipment as for standard API connections can be used for make-up and running. Shorter make-up times can be realized.
Increased hydraulic efficiency
The Flush ID of TPS-DS connections results in a better hydraulic Efficiency. Additionally, it can be produced with smaller OD/larger ID while still offering the same torsional capacities than standard API connections.
Extended product lifetime by allowing more OD wear
The TPS-DS connection can provide the same torque capacity at a smaller OD compared to standard API Drill Pipe connections. As a result, it can be used longer before being declared as Premium Class or Class II.
TPS-DS Performance characteristics
|Connection||OD (in)||ID (in)||Tensile Capacity (lbs)||Torsional Capacity (ft-lbs)||Recommended Make-up Torque (ft-lbs)*|
* calculated for Tool Joints with 130 ksi yield strength. More data available on request.