ELECTROMAGNETIC DOWNHOLE PUMP

摘要

The invention relates to electromagnetic downhole pumps. In the bottom end of a housing there are provided a valve assembly with check balls and a shock absorber. The housing has disposed therein a system of pistons for the pump stages. A first-stage piston, situated above the shock absorber, is in the form of a valve with a spherical check member. Inductance coils are disposed in the bodies of a second-stage piston and a third-stage piston. The pistons have axial openings and are separated from one another by chambers. The pump is provided with an additional inductance coil. An additional outlet piston is situated in an outlet chamber. The rod of the additional outlet piston is hollow and is embedded in an axial opening in the additional inductance coil. The side walls of the outlet chamber are provided with radial openings, which are situated below the additional outlet piston. The pistons of the pump stages are provided with connecting pipes. The connecting pipe of the third-stage piston is embedded in the axial opening of the additional coil. Restrictors are provided in the axial openings of the pistons and in the axial opening of the additional coil.