GPDS and EIS Connections

The Grant Prideco Double Shoulder™ (GPDS™) and EIS™ connections are high-performance rotary-shouldered tool joint connections available for drill pipe ranging in size from 2⅜ to 6⅝ in. Both connections offer a versatile alternative to standard API connection designs when higher operational torque and tool joint wear allowance are desired, and they are fully interchangeable with corresponding API NC or FH counterparts. GPDS and EIS are proven connections that provide increased torsional capacity, promote more streamlined configurations, and tolerate more tool joint wear than standard API rotary-shouldered connections.

Improved torque capacity

Streamlined GPDS and EIS connections provide 20 to 50% more torque than API rotary-shouldered connections of the same dimensions. This additional strength provides the required torque for drilling to extended depths or in more demanding environments.

Extended wear allowance

The GPDS and EIS connections greatly extend the life of the joint by tolerating more OD wear because of increased torsional capacity.

Interchangeability

Although similar to other API connections, these connections incorporate an internal secondary torque shoulder. Both use the same thread form and are interchangeable with their API counterpart connection, as shown in the chart in the specifications tab. The double shouldered pin secondary torque shoulder runs out without shouldering in the back of the API box connection. Similarly, the API pin will make up to the double shouldered box. “Interchangeability” means that the connections will mate together, make up, and function; however, the performance properties will be limited to those of an API connection. GPDS and EIS are not interchangeable with each other.

Slim profile and improved hydraulics

The GPDS and EIS connection’s increased torsional strength enables tool joint dimensional optimization more suitable for the pipe body torsional strength. Both connections can be configured with a smaller OD and larger ID compared to standard API connections, contributing to improved hydraulic performance. The GPDS and EIS design also provides a true flush ID through the mated tool joint assembly. There is no gap or change in the ID from the box to the pin, creating a smoother fluid flow with less turbulence and eliminating the opportunity for trapped cement and cuttings.

uGPDS

uGPDS™ is an enhanced version of the GPDS connection that enables either higher torque capacity or further enhanced hydraulics. uGPDS connections are interchangeable with GPDS and API connections of similar size. Contact your Grant Prideco representative about our uLtimate™ Series connections for more detailed information.