Ultra-low friction coatings for drill stem assemblies
First Claim
1. A coated drill stem assembly for subterraneous rotary drilling operations comprising:
- a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly or a coiled tubing coupled to a bottom hole assembly andan ultra-low friction coating on at least a portion of the exposed outer surface of the body assembly, wherein the coefficient of friction of the ultra-low friction coating is less than or equal to 0.15,wherein the ultra-low friction coating is diamond-like-carbon (DLC) and provides resistance to casing wear at least 3 times greater than an uncoated drill stem assembly.
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Accused Products
Abstract
Provided are drill stem assemblies with ultra-low friction coatings for subterraneous drilling operations. In one form, the coated drill stem assemblies for subterraneous rotary drilling operations include a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly or a coiled tubing coupled to a bottom hole assembly and an ultra-low friction coating on at least a portion of the exposed outer surface of the body assembly, wherein the coefficient of friction of the ultra-low friction coating is less than or equal to 0.15. The coated drill stem assemblies disclosed herein provide for reduced friction, vibration (stick-slip and torsional), abrasion and wear during straight hole or directional drilling to allow for improved rates of penetration and enable ultra-extended reach drilling with existing top drives.
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Citations
89 Claims
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1. A coated drill stem assembly for subterraneous rotary drilling operations comprising:
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a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly or a coiled tubing coupled to a bottom hole assembly and an ultra-low friction coating on at least a portion of the exposed outer surface of the body assembly, wherein the coefficient of friction of the ultra-low friction coating is less than or equal to 0.15, wherein the ultra-low friction coating is diamond-like-carbon (DLC) and provides resistance to casing wear at least 3 times greater than an uncoated drill stem assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for reducing friction in a coated drill stem assembly during subterraneous rotary drilling operations comprising:
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providing a coated drill stem assembly comprising a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly or a coiled tubing coupled to a bottom hole assembly, and an ultra-low friction coating on at least a portion of the exposed outer surface of the body assembly, wherein the coefficient of friction of the ultra-low friction coating is less than or equal to 0.15, and utilizing the coated drill stem assembly in subterraneous rotary drilling operations, wherein the ultra-low friction coating is diamond-like-carbon (DLC) and provides resistance to casing wear at least 3 times greater than an uncoated drill stem assembly. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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66. A coated drill stem assembly for subterraneous rotary drilling operations comprising:
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a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly or a coiled tubing coupled to a bottom hole assembly, hardbanding on at least a portion of the exposed outer surface of the body assembly, and an ultra-low friction coating on at least a portion of the hardbanding, wherein the coefficient of friction of the ultra-low friction coating is less than or equal to 0.15, wherein the ultra-low friction coating is diamond-like-carbon (DLC) and provides resistance to casing wear at least 3 times greater than an uncoated drill stem assembly. - View Dependent Claims (67, 68, 69, 70, 71, 72, 73, 74, 75)
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76. A method for reducing friction in a coated drill stem assembly during subterraneous rotary drilling operations comprising:
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providing a drill stem assembly comprising a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly or a coiled tubing coupled to a bottom hole assembly, hardbanding on at least a portion of the exposed outer surface of the body assembly, and an ultra-low friction coating on at least a portion of the hardbanding, wherein the coefficient of friction of the ultra-low friction coating is less than or equal to 0.15, and utilizing the coated drill stem assembly in subterraneous rotary drilling operations, wherein the ultra-low friction coating is diamond-like-carbon (DLC) and provides resistance to casing wear at least 3 times greater than an uncoated drill stem assembly. - View Dependent Claims (77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89)
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Specification