Galling resistant drill pipe tool joint and corresponding drill pipe
First Claim
Patent Images
1. A dope-free drill pipe tool joint comprising:
- a pin including a male threaded portion at an outer surface; and
a box including a female threaded portion at an inner surface, the female threaded portion to be screwed and fastened to the male threaded portion in a contacting zone consisting of a male threaded contacting surface and a female threaded contacting surface;
wherein at least a portion of the male threaded contacting surface or a portion of the female threaded contacting surface is a surface layer consisting of a hard metal and respectively at least a portion of the female threaded contacting surface or a portion of the male threaded contacting surface is a surface layer consisting of a soft material and where said both surface portions are contacting surfaces after screwing;
wherein the drill pipe tool joint is dope free;
wherein a hardness ratio of the hard metal to the soft material is equal or greater than 2.8; and
wherein the hardness ratio allows the pin and the box to be made up and broken out at least 25 times without any occurrence of galling.
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Accused Products
Abstract
Disclosed herein are embodiments of a drill pipe tool joint and a drill pipe which are optimized for repeated make-up/break-out operations without the use of screw grease. Embodiments of the disclosure are environment friendly as well as having improved operating efficiency. In particular, the box and pin can be formed from different materials having different hardness.
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Citations
30 Claims
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1. A dope-free drill pipe tool joint comprising:
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a pin including a male threaded portion at an outer surface; and a box including a female threaded portion at an inner surface, the female threaded portion to be screwed and fastened to the male threaded portion in a contacting zone consisting of a male threaded contacting surface and a female threaded contacting surface; wherein at least a portion of the male threaded contacting surface or a portion of the female threaded contacting surface is a surface layer consisting of a hard metal and respectively at least a portion of the female threaded contacting surface or a portion of the male threaded contacting surface is a surface layer consisting of a soft material and where said both surface portions are contacting surfaces after screwing; wherein the drill pipe tool joint is dope free; wherein a hardness ratio of the hard metal to the soft material is equal or greater than 2.8; and wherein the hardness ratio allows the pin and the box to be made up and broken out at least 25 times without any occurrence of galling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A dope-free drill pipe comprising:
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a pipe body; and a pin including a male threaded portion at an outer surface; and a box including a female threaded portion at an inner surface, the female threaded portion to be screwed and fastened to a male threaded portion of another drill pipe of the same kind, in a contacting zone consisting of a male threaded contacting surface and a female threaded contacting surface; wherein at least a portion of the male threaded contacting surface or a portion of the female threaded contacting surface is a surface layer consisting of a hard metal and respectively at least a portion of the female threaded contacting surface or a portion of the male threaded contacting surface is a surface layer consisting of a soft material and where said both surface portions are contacting surfaces after screwing; wherein the drill pipe is dope free; wherein a hardness ratio of the hard metal to the soft material is equal or greater than 2.8; and wherein the hardness ratio allows the pin and the box to be made up and broken out at least 25 times without any occurrence of galling. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A dope-free drill pipe tool joint comprising:
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a pin including a male threaded portion at an outer surface; and a box including a female threaded portion at an inner surface, the female threaded portion configured to be screwed and fastened to the male threaded portion in a contacting zone consisting of a male threaded contacting surface and a female threaded contacting surface; wherein at least a portion of the male threaded contacting surface or a portion of the female threaded contacting surface is a surface layer consisting of a hard metal and respectively at least a portion of the female threaded contacting surface or a portion of the male threaded contacting surface is a surface layer consisting of a soft material and where said both surface portions are contacting surfaces after screwing; wherein the drill pipe tool joint is dope free; and wherein a hardness ratio of the hard metal to the soft material is between 2.8 and 10.
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30. A dope-free drill pipe comprising:
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a pipe body; and a pin including a male threaded portion at an outer surface; and a box including a female threaded portion at an inner surface, the female threaded portion to be screwed and fastened to a male threaded portion of another drill pipe of the same kind, in a contacting zone consisting of a male threaded contacting surface and a female threaded contacting surface; wherein at least a portion of the male threaded contacting surface or a portion of the female threaded contacting surface is a surface layer consisting of a hard metal and respectively at least a portion of the female threaded contacting surface or a portion of the male threaded contacting surface is a surface layer consisting of a soft material and where said both surface portions are contacting surfaces after screwing; wherein the drill pipe is dope free; and wherein a hardness ratio of the hard metal to the soft material is between 2.8 and 10.
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Specification