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Knuckle Joints

Knuckle Joints

Easy positioning, maneuverability, and weight distribution

In production logging, the Knuckle Joint (PKJ) is used for tool positioning, and provides rigid length reduction for easier maneuverability and better weight distribution in highly deviated or horizontal wells.

Production Knuckle Joints for every position within the tool string

  • Knuckle joints are available in various diameters. The Production Knuckle Joint has a universal ball joint with a limited degree of movement, which allows a maximum of 10 degrees deflection in any direction. The joint has an electrical connection through a pressure proof stainless steel coil with metal-to-metal seals. This allows the tool to be used at any position within the tool string.

    Used individually, the knuckle joint reduces the rigid length of a tool string to facilitate deployment through twisted or buckled pipe, or to negotiate severe dog legs. Used as a pair, the knuckle joints decentralise the CCL for improved collar logs, particularly in larger pipe. In deviated or horizontal wells, knuckle joints provide de-coupling from the section of tool string that is centralized.

    Knuckle Joints from BHGE offer many features, including:

    • Used in situations where flexible tool strings are required
    • Offsets the CCL for improved collar logs
    • Minimizes the centralized weight in highly deviated or horizontal wells
    • Normally used in conjunction with Production Roller Centralisers
    • Simultaneous use with other PL tools

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