COMBINED PLUG Russian patent published in 2009 - IPC F42D1/08 

FIELD: oil and gas production.

SUBSTANCE: combined plug, including thrust part, for instance in the form of cylinder with expanding top-down cavity into which from below by cable traction it is draw in thrust cone. Cylinder is implemented in the form of sleeve from elastic material, for instance from rubber. Walls of sleeve allow variable elasticity maximal in bottom. Thrust cone, implemented of organic material, for instance from plastic mass, rest into bottom of sleeve. In cavity of sleeve and from above up to wellhead it is located particulate part, for instance from drilling sludge.

EFFECT: reliability growth of detonation products locking in charging cavity up to moment of total destruction of surrounding rock.

2 dwg