DETACHABLE PROTECTOR FOR DRILLING PIPE Russian patent published in 2005 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: body of device is made in form of bushing of elastic material. Device additionally has transverse bars spaced along circle in amount no less than three, mounted in such a way relatively to bushing, that outward displacement thereof causes increase of inner passing diametric protector size, and having clamps providing for possible connection of external detachers to it, forming said displacement. Bushing and bars are provided with mutual fixing elements, preventing possibility of their relative displacement after assembling. Clamps are placed on bars within range of portions of their mutual axial overlapping with bushing, and in the latter channels are made, providing for possible connection of detachers thereto. Clamps are made on portions of bars, extending beyond bushing limits, bars are fixed in longitudinal grooves made on inner surface of bushing. Each bar has at least one boss, which is deepened into radial aperture of bushing, connecting to outer surface thereof. Clamp is made in form of threaded aperture in the boss. Bars ends extend beyond bushing ends and have shape providing for possible mounting thereof during mounting of device on drilling pipe in appropriate longitudinal grooves of hollow, made on the latter. Bars are pressed into body with possible connection of clamps to detachers.

EFFECT: higher reliability, broader functional capabilities.

9 cl, 5 dwg