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Dual Flow Path Cooling System

IP.com Disclosure Number: IPCOM000237688D
Publication Date: 2014-Jul-02
Document File: 2 page(s) / 91K

Publishing Venue

The IP.com Prior Art Database

Abstract

High downhole temperatures have long been a determent to the life expectancy of the motor for an electrical submersible pump system. By design the motor has limited space for the internal lubricating oil and depends on forced convection flow of well fluid in the annulus of the casing for cooling. This invention helps solve both the cooling and circulation issues. It is a system that can be bolted on a standard motor to dramatically increase circulation of the lubrication oil while creating an amplified oil cooling system. This combination is estimated to increase the longevity of an electric submersible motor expected run life. It develops a dual system providing high velocity flow for the fluid in the heat exchanger and an elevated pressure for the fluid that is circulation through the motor.

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Dual Flow Path Cooling System

High downhole temperatures have long been a determent to the life expectancy of the motor for an electrical submersible pump system. By design the motor has limited space for the internal lubricating oil and depends on forced convection flow of well fluid in the annulus of the casing for cooling. This invention helps solve both the cooling and circulation issues. It is a system that can be bolted on a standard motor to dramatically increase circulation of the lubrication oil while creating an amplified oil cooling system. This combination is estimated to increase the longevity of an electric submersible motor expected run life. It develops a dual system providing high velocity flow for the fluid in the heat exchanger and an elevated pressure for the fluid that is circulation through the motor.

Thermal expansion and contraction of the lubrication oil within the motor has been handled by means of an expansion chamber referred to as Seal or Equalizer. By design the motor has limited space for the internal liberating oil and depends on forced convection, flow of well fluid in the annulus of the casing past the motor housing, as the primary source of cooling. The circulation of the motor oil within the system, across bearing surfaces etc., has also been considered inadequate; given the motor is expected to operate continuously in this environment for a number of years. The invention is a device that helps solve both the cooling and circulation issues of the internal motor oil by means of a motor cooler. The design concept is a bolt on system that communicates internally with the current motor design (with some minor modifications) which dramatically increases circulation of the lubrication oil while creating an amplified oil cooling system. The motor cooler (heat exchanger) is attached to the bottom of the motor and incorporates a small i...