| 摘要 |
FIELD: oil and gas extractive industry. ^ SUBSTANCE: device has body with inner recess and inner compacting elements, rigidly connected to sub at upper portion, and to end piece in shape of repeated inlet boot at lower portion, shell, mounted on body with possible axial displacement, connected to holder, barrel placed in lower portion of body with inner mounting surface and outer recess for holding element. Holding element is made in form of collet with outer stopping thread and ring groove for shear screws on its upper portion. Shell is made with threaded apertures with shear screws and lower flexible fixing assembly in form of collet or slip, or cut spring ring, with inner stopping thread, interconnected to upper portion of clamping element, collet of which is made with possible opening in barrel recess for its detaching from body. At starting upper position of shell holding element in inner recess of body has free drive no less then space between its lower end and lower face of body inner recess. In the body lower than shell a support ring is rigidly mounted with inner faces for limiting free drive of inner flexible fixing assembly of shell. ^ EFFECT: higher reliability and efficiency. ^ 8 cl, 5 dwg |
