Well jet device

Abstract

The invention relates to pumping equipment. The inventive jet device comprises a packer, a pipe column and a cradle in which drain ports are embodied and on which a jet pump is mounted in a body. Said body is provided with a channel for supplying an active medium to the nozzle, a channel for supplying a pumped-out medium, and a channel for evacuating the mixture of said mediums. The body also comprises a through channel embodied therein above the channel for supplying a pumped-out medium, connected thereto and used for arranging a sealing unit. Said sealing unit comprises a channel for passing the pumped out medium of a cable and a channel for supplying the pumped out medium of the cable used for arranging instruments and equipment. The channel for supplying a pumped-out the active medium is connected to the drain ports and to the space around the pipe column by means of said ports. The channel for evacuating the mixture the mediums from the jet pump is connected to the internal space of tubes above the jet pump. The sealing unit is embodied in such a way that it makes it possible to arrange thereinside a mechanism for bringing in the well and extracting therefrom the body containing the jet pump. A threaded hole for connecting autonomous measuring instruments to the body is embodied in the lower part thereof.

What is claimed is:  
     
         1 . A well jet unit which comprises a packer, a piping string having a support wherein drain ports are made and onto which a jet pump in its housing is installed, the said housing of the said pump comprising: a passage for supplying an active medium to the nozzle of the jet pump, a passage for supplying the medium pumped out of the well to the jet pump, and a passage for removing a media mixture from the jet pump, and in the housing, above the passage for supplying a pumped out medium, a through passage in communication with the latter being made with a mounting face for installing a sealing assembly, and the sealing assembly comprises a through passage with the possibility of leading through it and the said passage for supplying the pumped out medium a cable for the purpose of installing, in the well below the jet pump, instruments and equipment with the possibility of moving them along the well bore when the jet pump is or is not operated, characterized in that, according to this invention, the passage for supplying the active medium to the nozzle of the jet pump communicates with the drain ports and, through the latter, with the space surrounding the piping string, the passage for removing a media mixture from the jet pump communicates with the inner cavity of the piping string above the jet pump, the through passage is made with the possibility of installing in it, with the closure of the through passage, a device for delivering into and removing from the well the housing with the jet pump, and in the bottom part of the housing of the jet pump a threaded hole is made for attaching autonomous measuring equipment to the housing, wherein the outer diameter (D) of the jet pump housing is at least 1.0 mm less that the least inner diameter (D 1 ) of the piping string, the diameter (D 2 ) of the axial passage in the sealing assembly is at least 0.01 mm greater than the diameter (D 3 ) of the cable, and the diameter (D 4 ) of the passage for supplying the pumped out medium is at least 2 mm greater than the diameter D 3  of the cable, and sealing rings and a retaining mechanism being installed on the housing of the jet pump.