INTENSIFICATION METHOD OF HYDROCARBON FLOW FROM PRODUCTIVE FORMATIONS OF WELLS AND CAVITATING DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2012 - IPC E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: bottom of pipe string is equipped with cavitating device; pipe string is lowered to well shaft and cavitating device is installed in perforated part of the shaft. Working fluid is delivered under depression conditions through pipe string to cavitating device with ejection of high-speed jets of working fluid from outlet holes of its channels, which are uniformly distributed in circumferential direction, perpendicular to well shaft axis in order to perform cavitation wave action on perforated formation thickness. At that, translational movement of pipe string is performed. According to the invention, cavitating device is equipped at least with one multi-channel jet device providing formation of curved flows of working fluid with ejection of jets in radial directions to walls of well shaft with the pitch of outlet holes of their channels, which at least does not exceed the diameter of perforation channels. Device includes at least one cavitation generator comprising hollow housing with inlet housing for supply to it of working fluid, mechanism bringing the working fluid to rotational movement, confuser, annular vortex chamber and annular diffuser located on external surface, as well as jet device located between annular vortex chamber and annular diffuser and made in the form of connecting ring of rectangular section, which forms external side wall of annular vortex chamber and is provided in the plane perpendicular to longitudinal axis of the housing the uniformly located through outlet channels in circumferential direction with critical cross section of outlet holes for connection of annular vortex chamber with annular diffuser. According to the invention, jet device is multi-channel and is made in the form of annular block with possibility of arranging on its outer side surface of outlet holes and consisting of two coaxially connected annular elements. At that, outlet channels are located between contact end surfaces of the latter and made in the form of arc elements adjacent on one side to inner side surface of annular block, and on the other side at cross point of their longitudinal arc axes, on outer side surface of annular block to the straight line drawn from the centre located on its axis.

EFFECT: increasing oil and gas recovery of productive formations owing to more effective cleaning of filtration paths of container rocks from colmatant.

6 cl, 3 dwg