• Grant Prideco Double Shoulder™ (GPDS™) Connection

    Description

    The Grant Prideco Double Shoulder connection is a high performance, rotary shouldered tool joint connection available for drill pipe ranging in size from 2 ⅜ to 6 ⅝ inches. GPDS offers a versatile alternative to standard API connection designs when higher operational torque and tool joint wear allowance is desired, and 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.

    Features/Benefits

    Improved torque capacity

    Streamlined GPDS connections provide 20% to 50% greater torque when compared to API connections of the same dimensions. This additional strength provides the required torque for drilling to extended depths or in more performance-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

    The GPDS connection is similar to other API connections, except that 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 illustration in above rotating window. The GPDS pin secondary torque shoulder runs out without shouldering in the back of the API box connection. “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. The table below identifies the GPDS connections with their interchangeable API connection types.

    Connection Interchangeability
    GPDS26NC26
    GPDS31NC31
    GPDS38NC38
    GPDS40NC40
    GPDS46NC46
    GPDS50NC50
    GPDS555 ½ FH
    GPDS656 ⅝ FH

     

    Slim profile and improved hydraulics

    The GPDS connection’s increased torsional strength allows for 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 to improve hydraulic performance. The GPDS double shoulder design also provides a true flush ID through the mated tool joint assembly. There is no gap or change in the inside diameter from the box to the pin, creating a smoother fluid flow with less turbulence, in addition to eliminating the opportunity for trapped cement and cuttings.

    uGPDS™

    This enhanced version of the GPDS connection allows either higher torque capacity or further enhanced hydraulics. uGPDS connections are interchangeable with GPDS and API connections of similar size. Ask your NOV Grant Prideco sales representative about our Grant Prideco uLtimate™ Series connections for more detailed information.

    Specifications

    OD (in)Nominal Weight (lb/ft)GradeConnectionTool Joint OD (in)Tool Joint ID (in)Minimum MUT (ft-lb)Maximum MUT (ft-lb)
    3.50013.30S135GPDS385.0002.43814,50017,400
    3.50015.50S135GPDS385.0002.43814,50017,400
    4.00014.00S135GPDS405.2502.56318,20021,800
    4.00015.70S135GPDS405.3752.50019,10022,900
    4.50016.60S135GPDS425.3752.81319,20023,000
    4.50016.60S135GPDS466.0003.00026,40031,700
    4.50020.00S135GPDS466.1252.68832,10038,600
    5.00019.50S135GPDS506.6253.25035,90043,000
    5.00025.60S135GPDS506.6253.18837,30044,700
    5.50021.90S135GPDS557.0004.00036,40043,700
    5.50024.70S135GPDS557.2503.50051,00061,200
    5.87523.40S135GPDS557.1253.75044,00052,700
    5.87526.30S135GPDS557.2503.50051,00061,200
    6.62527.70S135GPDS658.1254.87552,90063,400
    Configurations in the above table are torque-optimized.
    Contact your Grant Prideco sales representative for hydraulic-optimized configurations and for further OD and ID combinations.

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