FIELD: oil production, particularly sucker-rod pumps operated in wells with watered product to pump associated water in another reservoir.
SUBSTANCE: sucker-rod pump assembly comprises sucker-rod pump, production tubing, packer to isolate reservoirs in well provided with production string, additional packer to be installed over upper reservoir, pump inlet to establish communication with one reservoir and piston head-end cavity communicated with hole annuity. Lower part of hole annuity may be connected with another reservoir through channel in area over additional packer. Production tubing has decreased length to provide oil lifting via production string and is connected only with pump cylinder. Inlet of channel, which provides communication with another reservoir, has valve with positive buoyancy in water and negative buoyancy in oil to prevent oil ingress in another reservoir.
EFFECT: simplified structure and increased reliability.
3 dwg
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