Metal protector for threaded extremities of well drilling tubes
OwnerAngel Gabriel Amadeo Carrano Castroinventor
Life of this patent
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Abstract
The invention relates to metal protectors for threaded extremities of pipe joints for the drilling of oil, gas and geothermal wells. The protectors are intended to protect the threads and seals of the assembly joint against shocks during transportation and handling in the wells and also eliminate the need to use a cardboard washer, which is only used to deliver the product, exposing the seal to shocks during handling in the wells after deterioration of the cardboard washer, considering that cardboard does not provide the same protection against impacts and shocks as steel.
Claims9
A screw-on seal protector cap (3) to protect the critical frontal hydraulic seal surface (11) of the side pinion joint (1) on a drill pipe assembly, by sizing the bell formed protector diameter (3a) so that it has a diameter equal, but not greater, to the outside diameter of the drill pipe adapter's joint diameter (1a), with the lower edge (14) of the bell (3a) having an inside bevel (13) of approximately 45 degrees (g) relative to the axial center line (a) of the protector cap (3) and being parallel to, the angle (f) of the bevel (12) of the adapter joint (1) that the bell bevel seats on, this bell shaped protector cap (3) having internal contoured threads (7) in a form and pitch equal to the external threads (5) at the end of the pipe adapter having sufficient end play (b) when assembled together to prevent seizure, and with an upper closed end (3c) having provision (5) for accepting a torque tool device used to lighten and prestressing the axial length of the bell shaped protector cap (3) between the threaded engagement (5, 7) of the cap (3) and the drill pipe adapter (1) and the inner bevel (13) on the bell (3a) being in contact with the outer bevel (12) adjacent to the critical planar circumferential hydraulic seal surface (11) on the drill pipe adapter (1) which is perpendicular to the center line axis (a) of the drill pipe adapter (1).
A screw-on seal protector plug (18) to protect the critical frontal hydraulic seal surface (26) of the box side joint (16) on a drill pipe assembly, by sizing the edge (27) or the rolled over collar (18e) in such a manner that the collar edge (27) exceeds the minor diameter (25) of the adapter joint bevel (24), the rolled over plug collar edge (18c) having an inside bevel (28) of approximately 45 degree (p) relative to the axial center line (a) of the protector plug (18) or profile equal to and parallel with the angle (o) of the adapter (16) joint bevel (24) that the plug (18) collar (18e) bevel (24) seats on, this plug and collar shaped protector (18) having external contoured threads (20) in a form and pitch equal to the internal threads (22) on the pipe adapter box joint (16) and having sufficient end play (m) when assembled together to prevent seizure, and with a lower closed end (18f) having provision (19) for accepting a torque tool device used to tighten and prestressing the axial length of the plug (18) and collar (18e) between the threaded engagement (20, 22) of the plug (18) and the drill pipe adapter (16) and the inner bevel (28) of the collar (18e) being in contact with the outer bevel (24) adjacent to the critical planar circumferential hydraulic seal surface (26) on the drill pipe adapter (16), which is perpendicular to the center line axis (a) of the drill pipe adapter (16).
Dependencies are inferred from the claim text.