JETTING ROPE SCRAPER Russian patent published in 2015 - IPC E21B37/02 

FIELD: oil and gas industry.

SUBSTANCE: device is comprised of a tubular body with connecting threads at ends and scrapers mounted outside in openings placed along the body generatrix. At even distance from scrapers in the body there are channels slanted towards its axis, which interconnect the body cavity with outer space, they are also equipped with heads oriented towards each other at angle and their axes are crossed at the point at the borehole wall. Outlet diameter of the lower jetting head is selected so that it is 1.1-1.3 times more than outlet diameter of the upper jetting head. Openings are made as longitudinal grooves with recesses equipped with mating dismountable bodies of scrapers having ledges rectangular in their cross-section and protruded outside limits of the tubular body and openings made at different height levels. Centrifugal separator is mounted under the upper connecting thread of the body.

EFFECT: maintained permeability and porosity of producing formations, reduced costs for development of the well, accident-free run-in of the string to the well is ensured, potential remedial cementing is reduced.

2 cl, 3 dwg