FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil production, namely to methods of simultaneous separate production of oil from multilayer well by production string, which excludes oil flows between inhomogeneous formations in well, which ensures elimination of effect on downhole and reservoir characteristics of each productive formation, and can be used both in low-yield and high-yield wells. Method includes assembly of deep-pumping unit comprising a sucker-rod pump consisting of a cylinder, a receiving valve, plunger with a pressure valve, connected to the rod string with centralizers, packer made in the form of self-sealing cups, bypass device, hollow shank and stop, lowering assembly into well, landing of packer and testing of packer for tightness, installation of wellhead equipment, selection of well products. Prior to assemble assembly, formation productive beds are determined, reservoir characteristics of productive formations, formation and bottomhole pressure, flow rate of each formation, mark of position of artificial bottomhole along vertical line and borehole, mean zenith angle of well shaft. Performing perforation of production string in interval of productive formations, upper end of pump cylinder is connected to additional branch pipe, on upper part of additional branch pipe additional collar packer is arranged. If the bottomhole pressure of the upper productive formation is higher than that of the bottom one, the cylinder is made with a side suction valve installed in the pump cylinder in the interval dividing the pump cylinder along the length in proportion to the productive beds productive rates. Shank is assembled consisting of branch pipes and slotted filter, as a stop a plug is used. Prior to descending of subsurface pump unit, well borehole is filled with process fluid with definite density. Top second additional branch pipe upper end is connected with setting hydraulic tool and deep-pump plant is lowered into the well to well bottom with immersion of packers for static well liquid level. Packer with self-sealing cuffs is arranged between productive formations, and additional packer is arranged above upper reservoir, distance between packers is not less than 150 m. Slit-type filter is placed in the interval of the lower payout bed. Pump is arranged in roof interval of upper reservoir. Hydraulic setting tool is withdrawn from the well. Plunger of simultaneous separate extraction pump is lowered on rod string to pump cylinder. Product extraction from two formations is performed by production string at wellhead.
EFFECT: increased efficiency of production of heterogeneous productive formations of multilayer deposits at simultaneous separate operation of two and more formations with production lifting by production string, reduction of forces required for descent and lifting of deep pump unit, exclusion of emergency situations, increased reliability of method at production in low-yield and high-yield wells, expansion of technological capabilities, simplification of method.
1 cl, 1 dwg
