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AssigneeIvan Solomonovich PYATOV
InventorsIvan Solomonovich Pyatov, Viktor Mihailovich Lysenko, Aleksey Vladimirovich Trulev
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The invention relates to crude oil production, and can be suitably used for hydroprotection of submersible electric centrifugal motors. A hydroprotection protector of a borehole pump electric motor comprises at least one stage, which stage includes a cylindrical body (7), a tube (8) coaxially positioned inside said body and surrounding a shaft (5), nipples (9, 10), a damping bushing (11), an end-face seal (12) and an annular piston (13), which piston is adapted to reciprocate in an annular chamber (14), which chamber is defined within the space between the cylindrical body (7) and the tube (8). The piston (13) separates the chamber (14) into two areas (15, 16) filled, respectively, with the dielectric fluid and the formation fluid arriving from the annulus. Two protective annular elements (17, 18) are attached to the piston (13) end-face, contacting the formation fluid, the protective annular elements (17, 18) protrude beyond outline of the piston and are contiguous, respectively, to the body (7) interior surface and to the tube (8) exterior surface. The space between the elements (17, 18) and the surfaces of body (7) and tube (8), contiguous to said elements, is filled with a protective lubricant. Embodiment of the invention prevents the formation fluid from seeping into the chamber containing the dielectric fluid, and allows to avoid contamination and wear of chamber's surfaces subjected to friction.
A hydroprotection protector of a borehole pump electric motor, which protector comprises:
A hydroprotection compensator of a borehole pump electric motor, comprising a cylindrical body and a base secured on said cylindrical body, which base has a passageway for establishing the fluid communication of the cylindrical body interior cavity with the annulus, characterized in that it comprises a piston positioned inside the cylindrical body and adapted to reciprocate and separating the space within the cylindrical body into two cavities, which cavities are respectively filled with the dielectric fluid and the formation fluid arriving from the annulus, and a protective annular element which is attached to the piston end-face contacting the formation fluid, protrudes beyond outline of the piston and contiguous to the cylindrical body interior surface, wherein the space between the protective annular element and the cylindrical body interior surface being filled with a protective lubricant.
A moveable mechanical module that separates, in a hydroprotection protector of borehole pump electric motor, the dielectric fluid and the formation fluid arriving from the annulus, and comprises an annular piston, characterized in that it comprises two protective annular elements attached to one of the annular piston's end-faces and protruding beyond outline of the piston, wherein first of said annular elements has the inner diameter approximately equal to the inner diameter of the annular piston, and the second of said annular elements has the outer diameter approximately equal to the outer diameter of the annular piston.
A moveable mechanical module that separates, in a hydroprotection compensator of a borehole pump electric motor, the dielectric fluid and the formation fluid arriving from the annulus, and comprises a piston, characterized in that it comprises a protective annular element which is attached to one of the end-faces of the piston, protrudes beyond outline of the piston and has the outer diameter being approximately equal to the piston's outer diameter.
Dependencies are inferred from the claim text.