Line shaft pump for extracting a fluid from a geothermal well

The line shaft pump design with a lubricant retention tube and centralizers addresses the challenge of oil return and installation damage, ensuring reliable and cost-effective operation with minimal environmental contamination.

US20260201896A1Pending Publication Date: 2026-07-16SULZER MANAGEMENT AG
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Patent Information

Application Number
US19/442763
Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Priority Date
2025-01-16
Filing Date
2026-01-07
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

The installation of line shaft pumps in geothermal wells is hindered by the lack of a functional oil return system due to the narrow gap between the pump and the well casing, leading to oil leakage and environmental contamination, and the risk of damage during installation.

Method used

A line shaft pump design with an impermeable lubricant retention tube surrounding the shaft, stabilized by centralizers that create a stable space for additional piping, allowing for a lubricant return line and minimizing friction and vibrations, along with a collector section for efficient lubricant recovery.

Benefits of technology

Enables reliable and continuous operation of the line shaft pump with reduced maintenance and environmental impact, optimizing operational costs and compliance with environmental standards.

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Abstract

A line shaft pump includes a drive unit and a hydraulic unit. A riser tube of the hydraulic unit includes an outer surface and an inner surface, and is arranged vertically between an impeller section and a discharge head. An essentially impermeable lubricant retention tube is arranged within the riser tube and surrounds a line shaft, providing an essentially vertical channel delimited in a radial direction by the line shaft and the lubricant retention tube. A hydraulic section includes a centralizer to receive the riser tube, the centralizer is in intimate contact to the outer surface. Radial dimensions of the centralizer are smaller than radial dimensions of an inner well surface, and the radial distance between the outer surface and the inner well surface is essentially constant in all radial directions at an axial position of the centralizer, and the centralizer includes an additional axial through hole.
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