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CHEMICAL COMPOSITION OF WIRE FOR HARDFACING APPLIED ON DRILLING PIPE TOOL JOINTS

20230119353 · 2023-04-20

    Inventors

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    Abstract

    The present invention refers to the chemical composition of a wire for hardfacing tool joints of oil drilling pipes, known in the industry as hardbanding. This wire has in its microstructure the formation of graphite to reduce the coefficient of friction and maintain hardness, aiming to protect the drilling pipe and the well casing pipe.

    Claims

    1. CHEMICAL COMPOSITION OF WIRE FOR HARDFACING APPLIED ON DRILLING PIPE TOOL JOINTS, characterized by having the following chemical composition: a. C: 1.0% to 4.5% by weight; b. Cr 3.0% to 12.0% by weight; c. Nb: 0.0% to 5.0% by weight; d. Ti: 0.0% to 5.0% by weight; e. Ce: 0.0% to 1.0% by weight; f. Mg: 0.0% to 1.0% by weight; g. Mn: 0.5% to 1.5% by weight; h. Ni: 0.0% to 20% by weight; i. Mo: 0.0 to 3.0% by weight; j. Si: 0.5% to 3.5% by weight; k. W: 0.5% to 1.0% by weight; l. P: < 0.010% by weight; m. S: < 0.0710% by weight.

    2. CHEMICAL COMPOSITION OF WIRE FOR HARDFACING APPLIED ON DRILLING PIPE TOOL JOINTS, according to claim 1, characterized by having a martensitic matrix with retained austenite.

    3. CHEMICAL COMPOSITION OF WIRE FOR HARDFACING APPLIED ON DRILLING PIPE TOOL JOINTS, according to claim 1, characterized by having titanium carbides.

    4. CHEMICAL COMPOSITION OF WIRE FOR HARDFACING APPLIED ON DRILLING PIPE TOOL JOINTS, according to claim 1, characterized by having niobium carbides.

    5. CHEMICAL COMPOSITION OF WIRE FOR HARDFACING APPLIED ON DRILLING PIPE TOOL JOINTS, according to claim 1, characterized by having graphite.

    Description

    BRIEF DESCRIPTION OF THE FIGURES

    [0013] FIG. 1: Micrograph of typical hardbanding wire microstructure with the new chemical composition after application on the tool joint.

    DETAILED DESCRIPTION OF THE INVENTION

    [0014] The chemical composition of the hardbanding wire according to the present invention is comprised between: [0015] C: 1.0% to 4.5% by weight; [0016] Cr: 3.0% to 12.0% by weight; [0017] Nb: 0.0% to 5.0% by weight; [0018] Ti: 0.0% to 5.0% by weight; [0019] Ce: 0.0% to 1.0% by weight; [0020] Mg: 0.0% to 1.0% by weight; [0021] Mn: 0.5% to 1.5% by weight; [0022] Ni: 0.0% to 20% by weight; [0023] Mo: 0.0 to 3.0% by weight; [0024] Si: 0.5% to 3.5% by weight; [0025] W: 0.5% to 1.0% by weight. [0026] P: < 0.010% by weight; [0027] S: < 0.0710% by weight;

    [0028] This chemical composition allows the formation of niobium and/or titanium carbides, a martensitic matrix with retained austenite and graphite.

    [0029] The carbides contribute to the wear resistance of the tool joint and the graphite plays the role of reducing the coefficient of friction in the interaction between the drill pipe and the well casing pipe.