A comprehensive technology for simultaneous water and gas (SWAG) injection with associated gas utilization from the annulus of production pumping wells was proposed. The developed pump-ejector system with a booster pump for SWAG injection was installed in one of the well pads at the Romashkinskoye field. The implementation of a dual-operation unit with an electric submersible pump (ESP) and a sucker rod pump (SRP) in one of the pad's wells for water recovery using ESP of saline water with a density of 1180 kg/m3 from Devonian formations located below the existing perforated interval where oil is produced by the SRP unit enabled a continuous supply of highly mineralized saline formation water to the SWAG system. There is no hydrate formation with the SWAG technology. The pump-ejector system operates reliably when pumping a water-gas mixture into an injection well in 24-hour operation. In addition to increasing the injection pressure to 14 MPa, it also heats the flow to 27-32 °C. In addition to the delayed increase in oil recovery due to SWAG, the implementation of a pump-ejector system with annular gas pumping achieves an immediate increase in fluid production by reducing the annular pressure in the production pumping wells. Another advantage of the SWAG technology is that, along with water and annular associated petroleum gas, hydrocarbon gas contained in the highly mineralized formation water produced by the ESP unit is also injected into the injection well, which shall further enhance oil recovery.
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