Patent ID: 7516797

Claim:
A method for operating a well jet device comprising: lowering a jet pump on a flow string into a well, wherein the jet pump has a stepped through passage in the body thereof and a packer with a through passage and a stem with an inlet funnel, are arranged below the jet pump; releasing the packer after arranging it above a productive formation; arranging a blocking insert with a central through passage into the stepped through passage, and pumping a hydraulic fracturing fluid or a mixture of a hydraulic fracturing fluid with chemical agents into the productive formation; extracting the blocking insert to the surface, and lowering a flexible tube passed through a sealing unit into the well through the flow string, said flexible tube adapted to being moved relative to the sealing unit; arranging a lower end of the flexible tube below or at the same level with a lower perforation interval of the productive formation, arranging said sealing unit in the through passage of the jet pump during the process of lowering the sealing unit; delivering a liquid working medium to the jet pump nozzle over the well annulus; and draining the productive formation by creating differential pressure drawdown in the under-packer area of the well, delivering a fluid for washing the well bottom to the well by the flexible tube at the same time with or after creating stable differential pressure drawdown on the productive formation, maintaining the relation between a pressure P f in the flexible tube and a pressure P w of the said liquid working medium being maintained within the range (P f :P. w )≦0.98; stopping the supply of the fluid for washing the well bottom after pumping out a fluid of the productive formation or a mixture of the hydraulic fracturing fluid and chemical agents in a quantity equal to at least twice the quantity of the hydraulic fracturing fluid pumped into the productive formation, and thereafter, but not earlier than in 5 minutes, stopping the supply of the liquid working medium into the jet pump nozzle; afterwards, extracting the flexible tube together with the sealing unit from the well, and carrying out hydrodynamic and geophysical studies of the productive formation with the use of a jet pump in order to evaluate the productivity of the formation; and then carrying out works on putting the well into operation.