DEVICE FOR TREATMENT AND COMPLETION OF WELL Russian patent published in 1996 - IPC

FIELD: gas and oil producing industry. SUBSTANCE: device for treatment and completion of well includes body 2 connected with pipe string 1. Installed on body 2 is jet pump 3 with nozzle 4, diffuser 5 and mixing chamber 6, hydrodynamic radiator 7, pipelines 8 and 9 for communication of pipe string 1 with radiator 7, and mixing chamber 6 with space under packer. Nozzle 4 and diffuser 5 are communicated, respectively, with pipe string 1 and string-borehole annulus. Pipeline 9 is made in body 2. Radiator 7 is installed in lower part of body 2. Length of pipelines 8 and 9 satisfies condition 2πC:ω(1/6+2n)</L₂-L₁/<2πC:ω(5/6+2n) where C is C is sound velocity in liquid, m/s; ω is angular velocity of radiator 7, c^-1; n=0,1,2...natural series of numbers; L₁ is length of pipeline 8, m; L₂ is length of pipeline 9,m. When bottom-hole formation zone is treated, drill string-to-casing annulus is closed at wellhead. Reagent is squeezed through pipe string 1, pipeline 8 and radiator 7 into formation. In this case, pump 3 does not operate, and reagent does not get to mixing chamber 6. Reagent passing radiator 7 undergoes pulsations of velocity which are transmitted to bottom-hole zone to clean it. Multiple treatment of well is possible without lifting the device. EFFECT: higher efficiency due to possibility of increasing value of depression exerted on bottom-hole formation zone. 1 dwg