Double shoulder oilfield tubular connection
AssigneeGrant Prideco, L.P.
InventorThomas Edward Winship
Life of this patent
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Abstract
The oilfield tubular pin and box connection includes double shoulders 16, 22. An inner sleeve 18 engages the box at shoulder 20, and provides one of the two shoulders 16, 22 for engaging the pin. The pin bore optionally may be provided with a similar sleeve 24, thereby providing one of the shoulders for engaging the box. The sleeve 18 may be secured to the box shortly after its manufacture, or may be added as a retrofit to an existing box with a single shoulder.
Claims20
An oilfield tubular connection including a threaded pin end on one tubular and a box end with mating threads on another tubular, the pin end having a nominal inside diameter smaller than the box end nominal inside diameter, the connection further comprising:
- the box end having a first torque shoulder formed at the axial end of the box end lying substantially in a plane perpendicular to a central axis of the oilfield tubular connection for engaging a mating surface integrally formed on the pin end, the first torque shoulder being spaced radially outward from the mating threads on the pin end and the box end;
- the pin end having a pin end surface lying substantially in a plane perpendicular to the central axis of the connection;
- and
- a box sleeve selectively securable to the box end, the box sleeve having a sleeve end surface for matingly engaging the pin end surface to form a second torque shoulder, said box sleeve being wholly received within said connection when said pin and said box end are mated.
An oilfield tubular connection including a threaded pin end on one tubular and a box end with mating threads on another tubular, the pin end having a nominal inside diameter smaller than the box end nominal inside diameter, the connection further comprising:
- the box end having a first torque shoulder formed at the axial end of the box end lying substantially in a plane perpendicular to a central axis of the oilfield tubular connection for engaging a mating surface integrally formed on the pin end, the first torque shoulder being spaced radially outward from the mating threads on the pin end and the box end;
- the pin end having a pin end surface lying substantially in a plane perpendicular to the central axis of the connection;
- a box sleeve selectively securable to the box end, the box sleeve having a sleeve end surface for matingly engaging the pin end surface to form a second torque shoulder, said box sleeve being wholly received within said connection when said pin end and said box end are mated, and
- each of the first shoulder and the second shoulder has a radial thickness of at least 25% of the radial thickness of the oilfield connection.
A method of forming an oilfield tubular connection including a threaded pin end on one tubular and a box end with mating threads on another tubular, the pin end having a nominal inside diameter smaller than the box end nominal inside diameter, the method comprising:
- forming the box end with a first torque shoulder formed at the axial end of the box end lying substantially in a plane perpendicular to a central axis of the oilfield tubular connection for engaging a mating surface integrally formed on the pin end, the first torque shoulder being spaced radially outward from the mating threads on the pin end and the box end;
- forming the pin end with a pin end surface lying substantially in a plane perpendicular to the central axis of the connection;
- securing a box sleeve to the box end, the box sleeve having a sleeve end surface for matingly engaging the pin end surface to form a second torque shoulder, said box sleeve being wholly received within said connection when said pin end and said box end are mated;
- and
- each of the first shoulder and the second shoulder has a radial thickness of at least 25% of the radial thickness of the oilfield connection.
Dependencies are inferred from the claim text.