DEVICE FOR PRESSURE-TESTING OF TUBING IN WELL Russian patent published in 1994 - IPC

FIELD: gas and oil producing industry. SUBSTANCE: device consists of body with through recesses over which connecting member slides and connects bushing installed in body and cover. Body has flushing ports in lower part and bottom. Body has seat for thrown locking member. Body has annular recesses separated by annular collars. Provided above upper recess is annular groove to receive spring retainer installed on outer surface of bushing. For pressure testing, thrown member is dropped inside tubing and test pressure is built-up. For opening the flushing ports and performance of well jobs, the device is lowered on string down to hole bottom and, by weight of string, the cover and bushing are moved upward. Bushing in upper position is locked by retainer. EFFECT: higher efficiency. 2 cl, 2 dwg