A closeup of a Grant Prideco Double-Shoulder Connection

GPDS Connections

Grant Prideco Double Shoulder connections offer enhanced performance and interchangeability with API rotary-shouldered connections.

  • Description Description
  • Ruler Specifications
Description

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

Improved torque capacity

Streamlined GPDS 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 connection greatly extends the life of the joint by tolerating more OD wear because of its increased torsional capacity.

Interchangeability

Although similar to other API connections, GPDS incorporates an internal secondary torque shoulder. GPDS has the same thread form and is interchangeable with its API counterpart connection, as shown in the chart in the specifications tab. The GPDS 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 GPDS 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.

Slim profile and improved hydraulics

The GPDS connection’s increased torsional strength enables tool joint dimensional optimization more suitable for the pipe body torsional strength. GPDS connections can be configured with a smaller OD and larger ID compared to standard API connections, contributing to improved hydraulic performance. The GPDS 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.

Specifications

Standard GPDS Configurations for S135-Grade Drill Pipe

Connection

Pipe OD (in.)

Nominal weight (lb/ft)

Tool joint OD × ID (in.)

Maximum MUT (ft-lb)

GPDS 38

3.500

13.30

5.000 × 2.438

17,400

GPDS 38

3.500

15.50

5.000 × 2.438

17,400

GPDS 40

4.000

14.00

5.250 × 2.563

21,800

GPDS 40

4.000

15.70

5.375 × 2.500

22,900

GPDS 42

4.500

16.60

5.375 × 2.813

23,000

GPDS 46

4.500

16.60

6.000 × 3.000

31,700

GPDS 46

4.500

20.00

6.125 × 2.688

38,600

GPDS 50

5.000

19.50

6.625 × 3.250

43,000

GPDS 50

5.000

25.60

6.625 × 3.188

44,700

GPDS 55

5.500

21.90

7.000 × 4.000

43,700

GPDS 55

5.500

24.70

7.250 × 3.500

61,200

GPDS 55

5.875

23.40

7.125 × 3.750

52,700

GPDS 55

5.875

26.30

7.250 × 3.500

61,200

GPDS 65

6.625

27.70

8.125 × 4.875

63,400

Configurations in the above table are torque optimized. Contact your Grant Prideco representative for hydraulic-optimized configurations and for further OD and ID combinations.


Connection Interchangeability for GPDS with API

GPDS Connection

API Connection

GPDS 26

NC 26

GPDS 31

NC 31

GPDS 38

NC 38

GPDS 40

NC 40

GPDS 42

Not interchangeable

GPDS 46

NC 46

GPDS 50

NC 50

GPDS 55

5½ FH

GPDS 65

6⅝ FH

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