METHOD OF OPERATION OF EJECTOR PUMPING UNIT AND DESIGN OF EJECTOR PUMPING UNIT Russian patent published in 2003 - IPC

FIELD: producing industry. SUBSTANCE: invention relates to well pumping units designed for producing and stimulation of oil in flow. According to proposed method ejector plant is lowered into well on pipes, packer is set on pipes below ejector set, shutoff element with pressure pickup is lowered on remote communication cable, shutoff element is placed on seat of ejector plant, and working medium is periodically pumped through ejector set. First extracted medium is continuously pumped out of formation during 0.5-2.0 h by pumping working medium through ejector set and after stopping of pumping out operation, owing to automatic closing of back-pressure valve, overpacker and underpacker spaces of well are separated, then process of pressure restoration in underpacker space is held, pressure restoration curve in underpacker space of well is plotted in "pressure - time logarithm" coordinates, time of pumping working medium through ejector set at its periodical operation is determined by abscissa of point of intersection of interpolated straight lines of initial and final sections of pressure restoration curve. In process of pumping through, time of stopping of ejector set is limited by time of its operation, and during stop of ejector set repressive stimulation of formation is carried out by placing underpacker space of well with overpacker space for a short time. Proposed ejector pumping unit comprises ejector set installed on pipes and including housing with active nozzle and mixing chamber arranged along pipes and pumped out medium supply channel and set for mounting shutoff element made inn housing coaxially with pipes. Shutoff element is installed for separating well spaces over and under ejector set. Packer is fitted on pipes below ejector set. Channel with back-pressure valve is made in shutoff element. Said channel is connected at inlet with pumped out medium supply channel and at outlet, above back-pressure valve, with mixing chamber of ejector set. Bypass channel is provided which is connected at inlet with mixing chamber and at outlet, with pumped out medium supply channel. Shutoff element comprises spring-loaded valve with hollow rod overlapping bypass channel and closed in normal state. Distant-reading pressure gauge is installed in upper part of hollow rod. Pressure pickup of distant-reading pressure gauge is installed in rod space, and space of rod is placed in communication with pumped out medium supply channel through valve and further on, with underpacker space of well. EFFECT: increased capacity of ejector pumping unit owing to optimization of sequence of operations at stimulation of inflow. 3 cl, 1 dwg