METHOD OF INTERVAL PRODUCTIVE FORMATION TREATMENT IN OPEN HORIZONTAL BORE OF WELL Russian patent published in 2017 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: in method of interval productive formation treatment in open horizontal bore of well diameters of open horizontal well bore at the borders of each detected interval with low permeability are determined, a pipe composition is collected consisting of a blind joint, the first hydraulic packer, the first nozzle with perforated holes, a pulsed fluid pulsator, a breakable valve, the second nozzle with perforated holes and an inner ring excerpting, the second hydraulic packer, wherein the perforated holes of the second nozzle are overlapped from within by the hollow sleeve fixed by shear element. Then the pipe compositon is descended at the bottom end of the pipe into the first from the bottom hole interval with reduced permeability so that the hydraulic packers of the pipe composition overlapped the first interval with reduced permeability from both sides of the open horizontal well bore, process fluid is pumped through the pipe string, at first two hydraulic packers are simultaneously landed and then the breakable valve is cut off, pulsed injection of 15% concentrated hydrochloric acid is carried out through the perforated holes of the first nozle into the first interval with reduced permeability. Then a displacement plug is mounted at the well mouth and its squeezing is carried out under process fluid pressure in the pipe string, wherein the displacement plug is moved along the pipe string, lands at the hollow sleeve, destroys the shear element and moves the hollow sleeve up to the stop into the inner ring excerpting, wherein the hollow sleeve is fixed in the second perforated nozzle, well withstanding to the reaction is carried out, after completion of which reaction products are removed by swabbing along the pipe string. Afterwards injection of inverted acid-oil emulsion is carried out in an accelerated mode along the pipe string through the perforated holes of the second nozzle into the first interval with reduced permeability, then well withstanding to the reaction is carried out, after which the pipe string tension is carried out upwards and both hydraulic packers of the pipe composition are released, direct flushing is carried out and reaction products are removed from the first interval with reduced permeability, afterwards the pipe string with pipe composition is extracted from the well. The abovementioned technological operations are repeated each time for the interval treatment of remaining intervals with reduced permeability, starting with the installation of the pipe composition and extraction of pipe string with pipe composition from the well.

EFFECT: increased productivity of bottomhole zone, improved reliability of the treatment method, exception of acid destructive effect on the sealing elements of the packers.

4 dwg