DEVICE FOR WELL CLEANING FROM SAND PLUG Russian patent published in 2012 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: device contains transient module, hollow casing rigidly fixed in lower part with external striking bit, working chamber located in hollow housing and damage mechanism installed in hollow housing. External striking bit is provided with end teeth and has inclined upward radial holes. Hollow housing is sprung against transient module through reducer in the form of coupling nut and has a collar on inner surface. Damage mechanism includes hollow connecting rod, internal striking bit with end teeth and inclined downward radial holes connected to connecting rod, and a valve. Transient module consists of hollow rod with annular collar on inner surface in lower part and sleeve-reducer. Working chamber consists of three embedded parts with common axial channel welded into elastic elements. The middle embedded part has radial threaded holes. Lower embedded part is designed with projection in lower part connected by threaded joint to hollow connecting rod of damage mechanism. Internal striking bit has channels and is designed integrated with connecting rod. Damage mechanism valve is designed as a hanging stem with projection in upper part and two rows of through longitudinal slots in the middle part.

EFFECT: improving efficiency and quality of cleaning, simplifying the design.

5 dwg