DEVICE FOR PUMPING GAS-LIQUID MIXTURE TO FORMATION Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention pertains to oil industry and can be used in system of out-contour and contour waterflooding during development of oil deposit with maintenance of formation pressure. The concept of the invention is as follows: device contains inner pipe string equipped with chamber for fluid and gas receipt and outer pipe string, encapsulated assembly. At that chamber for fluid and gas receipt communicates with tubing-casing annulus above the encapsulated assembly; it is made as low-pressure chamber of jet pump with ejector installed at the jet pump input, while it output is communicated with inner tubing string. At that delivery of gas is envisaged to tubing-casing annulus with possibility of its suction to low-pressure chamber of the jet pump. Encapsulated assembly is made as packer and installed in the well being a part of inner tubing string above the formation. Beyond the packer and opposite low-pressure chamber of the jet pump inside the inner tubing string there are through radial grooves for gas delivery. Outer piping string is equipped from below with ejector telescoped into the inner piping string at the input of low-pressure chamber of the jet pump with potential axial displacement in regard to inner piping string and regulation of flow passage of through radial grooves with possibility of their sealed cut-off. At that input of the jet pump is communicated with the outer piping string. Below the jet pump output the inner piping string is equipped with diaphragms with the central slotted openings. Each slotted opening of the following diaphragm is shifted per angle of 15-20° towards clockwise or anticlockwise direction. Below diaphragm inside the inner piping string there's tubular smoothing sleeve for liquid-gas mixture.

EFFECT: reducing metal consumption for the device structure, improving quality of gas dispergation in liquid, and intensified mixing of gas-liquid mixture with potential regulation of gas-cutting value for the fluid pumped into the formation.

4 dwg