METHOD FOR PIPELINE PULLING THROUGH HORIZONTAL HOLE UNDER WATER AND OTHER NATURAL AND ARTIFICIAL OBSTACLES Russian patent published in 2007 - IPC E02F5/18 

FIELD: machines for digging horizontal holes in the soil.

SUBSTANCE: method involves drilling horizontal hole by well-known method and pulling pipeline filled with liquid through the hole. Hole reaming assembly is preliminarily formed. Well drilling with expansible assembly is accompanied by recording of data received from reamer puling force sensor in dependence of sensor depth to determine hole areas having complicated cross-sections. Then pipeline pulling assembly is created. Pipeline pulling assembly comprises drill pipe string connected to pipeline head having antifriction composition supply nozzles protected against ground ingress and antifriction composition metering device provided with piston arranged therein. The piston is controlled by liquid pressure inside pipeline. Device also has pipeline liquid pressure control and discharge. As pipeline head enters in said hole areas having complicated cross-sections during pipeline pulling liquid pressure is increased with the use of compressor or pump station and metering device located in head and said hole section is treated with antifriction composition.

EFFECT: increased reliability of pipeline laying due to prevention of pipeline insulation damage during pipeline pulling through horizontal hole.

2 dwg