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    API 7-1
    OCTG Pipe Types

    Drill Collars

    Heavy-walled tubulars providing weight-on-bit and maintaining directional control in the bottom hole assembly.

    Overview

    Drill collars are thick-walled tubulars that provide the weight required to advance the bit. Their mass and rigidity help maintain hole direction while transmitting the necessary force for efficient drilling.

    Technical Specifications

    MaterialAISI 4145H Modified
    ConnectionsNC/REG
    Inner Diameter1-1/4" to 4"
    Outer Diameter3-1/8" to 11"

    Applications

    Weight-on-bit
    Directional control
    BHA stabilization
    Vertical drilling

    Frequently Asked Questions

    What is Drill Collars?

    Drill collars are thick-walled tubulars that provide the weight required to advance the bit. Their mass and rigidity help maintain hole direction while transmitting the necessary force for efficient drilling.

    What are the applications of Drill Collars?

    Drill Collars is commonly used for: Weight-on-bit, Directional control, BHA stabilization, Vertical drilling.

    What API standard applies to Drill Collars?

    Drill Collars is manufactured according to API 7-1 specifications.

    Manufacturers

    No manufacturers linked yet.

    Related Products

    CasingTubingDrill PipeHeavy-Weight Drill Pipe (HWDP)
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