Patent ID: 7409989
Filing Date: 2008-08-12
Classification: F04F

Abstract:
1. 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: and being made with the following dimensional relations: the relation of the diameter D the relation of the mixing chamber length L the relation of the nozzle length L the distance L from the nozzle output cross-section to the mixing chamber input cross-section is from 0.3 to 2 diameters D 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 ΔP is the maximum allowable value of depression on a production formation, in N/m g is the acceleration of gravity, in m/s σ is the fluid density in a well, in kg/m