Abstract: A fluid end having a longitudinal bore less than about 36 inches in diameter has an internal surface that is cold-worked to have compressive stresses of at least 15 ksi (103.42 MPa) beneath the metal surface up to about 40 mils (1.016 mm).

Abstract: A downhole tool includes a circumferential band having a plurality of axially adjacent weld beads forming a wear resistant surface along a particular axial length of the tool and at least one circumferential multi-layer coating applied axially adjacent the band on either end. The multi-layer coating includes a first layer, exhibiting a first color, applied directly onto the tool surface, and a second wear-resistant layer, exhibiting a second color different from the first color, applied directly onto the first layer. The second layer wears or is removed by a certain amount, such that the first color of the first layer is revealed to indicate the extent of wear and/or that the tool should be removed from service and refurbished by applying a new wear-resistant coating.

Abstract: A fluid end having a longitudinal bore less than about 36 inches in diameter has an internal surface that is cold-worked to have compressive stresses of at least 15 ksi (103.42 MPa) beneath the metal surface up to about 40 mils (1.016 mm).

Abstract: A downhole tool includes a circumferential band having a plurality of axially adjacent weld beads forming a wear resistant surface along a particular axial length of the tool and at least one circumferential multi-layer coating applied axially adjacent the band on either end. The multi-layer coating includes a first layer, exhibiting a first color, applied directly onto the tool surface, and a second wear-resistant layer, exhibiting a second color different from the first color, applied directly onto the first layer. The second layer wears or is removed by a certain amount, such that the first color of the first layer is revealed to indicate the extent of wear and/or that the tool should be removed from service and refurbished by applying a new wear-resistant coating.

Abstract: A downhole tool includes a circumferential band having a plurality of axially adjacent weld beads forming a wear resistant surface along a particular axial length of the tool and at least one circumferential multi-layer coating applied axially adjacent the band on either end. The multi-layer coating includes a first layer, exhibiting a first color, applied directly onto the tool surface, and a second wear-resistant layer, exhibiting a second color different from the first color, applied directly onto the first layer. The second layer wears or is removed by a certain amount, such that the first color of the first layer is revealed to indicate the extent of wear and/or that the tool should be removed from service and refurbished by applying a new wear-resistant coating.

Abstract: A tool for cold-working a metal substrate of a longitudinal bore having a diameter less than about eight inches includes a deflector tip configured to direct accelerated shot having diameters on average not larger than 100 mils (2.54 mm) toward a surface of the metal substrate at an angle between about 70 degrees and about 85 degrees relative to the surface, thereby providing increased compressive stresses in the metal substrate.

Abstract: A tool for cold-working a metal substrate of a longitudinal bore having a diameter less than about eight inches includes a deflector tip configured to direct accelerated shot having diameters on average not larger than 100 mils (2.54 mm) toward a surface of the metal substrate at an angle between about 70 degrees and about 85 degrees relative to the surface, thereby providing increased compressive stresses in the metal substrate.

Abstract: A fluid end having a longitudinal bore less than about 36 inches in diameter has an internal surface that is cold-worked to have compressive stresses of at least 15 ksi (103.42 MPa) beneath the metal surface up to about 40 mils (1.016 mm).

Abstract: A tool for cold-working a metal substrate of a longitudinal bore having a diameter less than about eight inches includes a deflector tip configured to direct accelerated shot having diameters on average not larger than 100 mils (2.54 mm) toward a surface of the metal substrate at an angle between about 70 degrees and about 85 degrees relative to the surface, thereby providing increased compressive stresses in the metal substrate.

Abstract: A downhole tool includes a circumferential band having a plurality of axially adjacent weld beads forming a wear resistant surface along a particular axial length of the tool and at least one circumferential multi-layer coating applied axially adjacent the band on either end. The multi-layer coating includes a first layer, exhibiting a first color, applied directly onto the tool surface, and a second wear-resistant layer, exhibiting a second color different from the first color, applied directly onto the first layer. The second layer wears or is removed by a certain amount, such that the first color of the first layer is revealed to indicate the extent of wear and/or that the tool should be removed from service and refurbished by applying a new wear-resistant coating.