DEVICE FOR CLEANING WELL FROM SAND OBSTRUCTION Russian patent published in 2004 - IPC

FIELD: well maintenance technologies.

SUBSTANCE: device has branch pipe, lower end surface of which is made in form of saddle. Branch pipe in lower portion is connected to casing containing detachable hollow body and cover connected by sleeve. In upper portion of detachable hollow body circulation apertures are made, overlapped by elastic membrane. Lower portion of body contains end teeth. On inner surface of cover ring recess is made with cut spring ring mounted in it. In casing, destruction mechanism is coaxially mounted, containing detachable hollow rod in upper portion, made in form of ring piston. Detachable hollow rod forms an expanding chamber together with detachable hollow body. Branch pipe and destruction mechanism have common axial hydraulic channel. Detachable hollow rod is spring-loaded with reciprocal spring. Upper end surface of detachable hollow rod is made in form of truncated cone and forms an end valve with saddle, while lower one is connected to lower sleeve with crown. Onto crown a hydromonitoring head piece is freely mounted with possible axial rotation. Crown has end teeth, radial channels and axial throttling aperture. Hydromonitoring head piece has tangential channels. On inner surface of lower sleeve ring-shaped groove is made at level of ring recess. Parts of detachable hollow rod are connected to upper sleeve with forming of ring chamber between its outer surface, inner surface of detachable hollow body and lower end surface of upper sleeve. Ring chamber is connected to common axial hydraulic channel by radial apertures. Area of cross-section of ring channel equals area of cross-section of common axial hydraulic channel in portion of detachable hollow rod.

EFFECT: higher efficiency.

1 dwg