WATER JET DRILLING HEAD Russian patent published in 2008 - IPC E21B7/04 E21B7/18 

FIELD: construction.

SUBSTANCE: invention pertains to construction, in particular to special methods and devices for horizontal drilling using a jet of liquid or gas, used in trenchless construction of pipelines in the soil. The water jet drilling hole consists of an inverted-V frontal surface with any drilling projection coupled with the inclinations, a calibrating part with an oblong contour of the cross-section, guiding part with an asymmetric slant, apparatus for joining with the column of the drilling pipe and a discharge duct with inputs into jet nozzles. The inverted-V frontal surface with any drilling projection coupled with inclinations is located on the slope of the guiding part. Any drilling projection is oriented in the longitudinal direction of the slope of the guiding part. At least two jet nozzles are arranged on the opposite parts of the calibrating part adjacent to the slopes. At least one jet nozzle is arranged on the calibrating part oriented in the longitudinal direction of the slope of the guiding part in the direction of the frontal surface.

EFFECT: provision for the condition of controlled deflecting action on the drilling head in the ground with gravel-stone-pebble layers and increased reliability of guided water jet action.

2 cl, 5 dwg