Down-hole jet equipment for logging and development of horizontal wells

Abstract

Jet-pumping techniques for wells comprises mounting a logging tool, sealing member and jet pump on a flexible smooth tube. The pump contains nozzle and mixing chamber with diffuser with outlet connected to a tube cavity, nozzle inlet connected to space outside the tube. The tube is movable within a packer tubing string. Packer through channel diameter D 1 is at least 12 mm smaller than the inside tubes diameter D 2 . A tube closing ball crane is provided between the pump and the member. The cylindrical body member is filled with elastic liners with bearing washers and top bearing pusher member. An insert with flange and mobile ring attaches below the body, a sleeve is provided between mobile ring and body . The flange diameter<diameter D 1 of the packer through channel. The ring diameter D 3 >diameter D 1 . The ring lower surface is coated with elastic material.

1 . A well jet unit, comprising, all being arranged on a flexible smooth pipe upwards: a multiple-measurement instrument embracing the flexible pipe, a sealing element arranged movably and a jet pump which body is provided with a nozzle and a mixing chamber with a diffuser; the outlet of the diffuser is connected to the inner cavity of the flexible smooth pipe, and the nozzle of the jet pump is connected, on the side of its inlet, to the annular space around the flexible smooth pipe, and check valves are arranged in the channel for supplying a pumped-out medium, as made in the jet pump body, on the side of its inlet and on the nozzle input, the flexible pipe being arranged with the possibility of moving axially in a flow string provided with a packer for the purpose of sealing the space between the flow string and a casing string, the packer being provided with a through channel which diameter D 1  is at least 12 millimeters lesser than the inner diameter D 2  of the flow string; openings are made in the wall of the flexible smooth pipe above the multiple-measurement instrument that connect the inner cavity of the flexible smooth pipe to the under-packer well space, a ball cock, which is intended for closing the inner cavity of the flexible smooth pipe when the well jet unit is removed to the surface, is arranged on the flexible smooth pipe in its section between the jet pump and the sealing element; the sealing element is made in the form of a cylindrical body filled in its upper part with a set of elastic gaskets embracing the flexible smooth pipe, the said gaskets being provided with thrust washers arranged therebetween, and with a thrust pressure element, a supporting sleeve is fixed in the lower portion of the cylindrical body and is provided in its lower end with a thrust flange above which and on the sleeve a movable thrust ring is arranged; a sealing collar is arranged between the movable thrust ring and the lower portion of the cylindrical body; the diameter of the thrust flange is lesser than the diameter D 1  of the through channel of the packer, the thrust ring has the diameter D 3  that is greater than the diameter D 1  of the through channel of the packer; and the lower face of the thrust ring is coated with an elastic material.