Patent ID: 7409989

Claim:
A well jet device comprising: a packer; a jet pump, in the body of which an active nozzle and a mixing chamber with a diffuser are arranged as well as a stepped through channel is made; said packer and jet pump being arranged on a tubing string; and a sealing unit with an axial channel is arranged in the stepped through channel; a flexible tube with a logging device for measuring physical quantities, e.g., a specific resistance of rocks, being arranged on the lower end thereof; and the jet pump being arranged over producing formations in a well at a distance h, being equal to: h ≥ P f - Δ ⁢ ⁢ P g ⁢ ⁢ σ , and being made with the following dimensional relations: the relation of the diameter D cc of the mixing chamber cross-section to the diameter D c of the nozzle output cross-section is from 1.1 to 2.4; the relation of the mixing chamber length L c to the diameter D cc of the mixing chamber cross-section is from 3 to 7; the relation of the nozzle length L n to the diameter D c of its output cross-section is from 1 to 8; the distance L from the nozzle output cross-section to the mixing chamber input cross-section is from 0.3 to 2 diameters D c of the nozzle output cross-section; and the angle α between the diffuser generatrix and the diffuser longitudinal axis is from 4° to 14°, where: h is the vertical component of the distance between the jet pump and the bottom of the production formations, in meters; P f is the formation pressure, in N/m 2 ; ΔP is the maximum allowable value of depression on a production formation, in N/m 2 ; g is the acceleration of gravity, in m/s 2 ; σ is the fluid density in a well, in kg/m 3 .