DEVICE FOR DIRECTION DRILLING WITH CIRCULATION AND SOIL PROTECTION IN WELL CONSTRUCTION Russian patent published in 2011 - IPC E21B3/00 E21B7/00 

FIELD: construction.

SUBSTANCE: device for direction drilling with circulation and soil protection in well construction comprises a development area for soil working, a casing tube with a cutting tool at the lower end and a throughput device for liquid medium throughput, a collector to receive developed drill fines. The collector is made as a hollow pipe equipped with a drain nozzle placed as capable of longitudinal displacement onto the casing tube and deepened into the development area by depth of 0.5-1.5 metre. The throughput device is a swivel connected via a master pipe to the upper part of the casing pipe, besides, on top the collector is narrowed, which does not prevent casing pipe throughput with couplings. The drain nozzle is made at the distance from the upper end and the diameter, which prevents liquid outflow via the collector's top. The cutting tool is made with the possibility to break the development area by thickness that exceeds the thickness of the casing pipe with the coupling.

EFFECT: provides for reliable operation, circulation of washing fluid and protection of soil against spillage of washing fluid in well construction.

1 dwg