DEVICE FOR WELL CLEANING OF SAND PLUG Russian patent published in 2007 - IPC E21B37/00 E21B21/00 

FIELD: oil production, particularly for maintenance and complete overhaul of wells with flushing.

SUBSTANCE: device comprises nipple concentrically installed in hollow body, hollow cylindrical nozzle connected to lower body end, branches communicating interior of nipple plugged from below with sand plug formation area. Self-sealing collar is installed on outer surface of hollow body and is retained by lock nut from collar top. The lock nut is screwed on hollow body. Limiter made as hollow cylinder with toothed crown at lower cylinder end is fixedly connected to lower body end. Installation bush may perform limited axial displacement with respect to the body. Radial and through orifices are made in body over self-sealing collar with lock nut and in central part of installation bush. Vertical slots are created between the collar and radial orifices. As finger is arranged in upper part of vertical slot radial orifices are sealed with installation bush. As finger is arranged in lower part of vertical slot radial orifices and through orifices are brought into alignment with each other.

EFFECT: simplified structure and increased reliability and efficiency.

1 dwg