Centrifugal Pump Connection Device for Electrical Submersible Pump Unit

Abstract

The invention relates to a centrifugal pump connection device for electrical submersible pump unit; two or more centrifugal pumps are fixedly connected successively from top to bottom, the lower end of a centrifugal pump body being a connecting flange and a rabbet at the lower end of the connecting flange inserting in the upper inner bore of an adjacent centrifugal pump body, the contact surface between the connecting flange and the centrifugal pump body is a spherical surface, and the used washer of a bolt is a disc washer; the spherical surface of the connecting flange is a convex spherical surface, and the spherical surface of the upper end of the centrifugal pump body is a concave spherical surface. The device has the following benefits: it has reasonable structure, being able to improve the overall flexibility of the electrical submersible pump unit, and to increase success rate of the electrical submersible pump unit descending into horizontal well and highly-deviated well and durability of the electrical submersible pump, and to largely decrease production cost. The present invention overcomes deficiencies of plastic deformation and breakage of the unit housing and breakage of connection bolts during the process of the electrical submersible pump unit descending into the horizontal well and highly-deviated well, in which flat flange, common spring cushion and bolt are used between conventional centrifugal pumps.

Dependencies are inferred from the claim text.