FIELD: mining industry.
SUBSTANCE: group of inventions relates to mining, namely to the development of wells using jet pumps. The method includes the descent into the well of a device including a jet pump and a packer, the isolation of the annular space above the roof of the formation and the treatment of the bottomhole zone in the mode of pumping the treatment fluid into the productive formation and in the mode of taking it out of the formation. The jet pump is switched to the injection mode and the axial movement of the housing is carried out with the overlap of the hydraulic connection of the pump with the above-packer annular space. Then the treatment fluid is fed into the casing string and then into the reservoir. After the process time, by axial movement of the housing, it is transferred to the reservoir fluid extraction mode, in which the hydraulic connection of the housing with the above-packer annular space is provided and the inner cavity of the casing string is separated from the sub-packer space. Next, the working fluid is supplied to the casing string, an area of reduced pressure is created, ensuring the suction of the reservoir fluid and moving it to the surface through the above-packer annular space. Upon completion of the first stage of processing, subsequent stages are carried out in the same sequence of actions. The jet pump contains a housing with a through hole, channels for supplying working fluid and removing reservoir fluid, a nozzle, a mixing chamber with a diffuser and a system for switching operating modes, including a sealing sleeve, a sleeve rigidly connected to it with a shaped groove interacting with a hollow rod.
EFFECT: processing productivity of the bottom-hole zone is increased by reducing time costs and eliminating the use of additional equipment, reliability is increased and zero accident rate is ensured.
11 cl, 14 dwg
