Enhanced cooling for downhole motors

Inactive Publication Date: 2009-02-26
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is especially a problem when the fluid has a high viscosity, a low specific heat, and a low thermal conductivity.
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Method used

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  • Enhanced cooling for downhole motors
  • Enhanced cooling for downhole motors
  • Enhanced cooling for downhole motors

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033]In one example, electrical submersible pumps with finned and unfinned motors were analyzed in a flowing fluid, wherein the fluid had the following properties, a density of 62.0 lb / ft3, a viscosity of 0.00458 lbm / ft sec, and a flow rate of 969.7 lbm / min. The flow velocity in the finned annulus was 1.04 ft / sec and 0.928 ft / sec in the un-finned annulus. Each motor outside diameter was 7.25 inch outside diameter with a 10.2 inch casing inner diameter. The analysis assumed 45 fins on the finned motor, each fin being 82 inches long, 0.525 inches in height, and 0.187 inches thick. The calculated temperature rise for the finned motor was 27.67° F. and 91.78° F. for the unfinned motor.

example 2

[0034]In another example, two electrical submersible pumps having finned and an unfinned motors were analyzed in a flowing fluid having a temperature of 40° F., density of 61.2 lb / ft3, a viscosity of 1.344 lbm / ft sec, a specific heat of 0.48 btu / lbm ° F., thermal conductivity of 0.075 but / hr ft ° F., with a flow rate of 2386.2 lbm / min. The fluid used in this example was oil. The flow velocity in the finned annulus was 2.89 ft / sec and 2.46 ft / sec in the un-finned annulus. Each motor outside diameter was 7.25 inch outside diameter with a 10.2 inch casing inner diameter. The motor horsepower was 1500 hp. The analysis assumed 57 fins on the finned motor, each fin being 816 inches long, 0.5 inches in height, and 0.2 inches thick. The calculated internal temperature for the finned motor was 193.56° F. with an external temperature of 94.82° F., the calculated internal temperature was 577.77° F. for the unfinned motor with an external temperature of 479.04° F.

example 3

[0035]In another example, two electrical submersible pumps having finned and unfinned motors were analyzed in a flowing fluid having a temperature of 174° F., density of 61.2 lb / ft3, a viscosity of 0.15456 lbm / ft sec, a specific heat of 0.48 btu / lbm ° F., thermal conductivity of 0.075 but / hr ft ° F., with a flow rate of 2386.2 lbm / min. The fluid used in this example was oil. The flow velocity in the finned annulus was 2.89 ft / sec and 2.46 ft / sec in the un-finned annulus. Each motor outside diameter was 7.25 inch outside diameter with a 10.2 inch casing inner diameter. The motor horsepower was 1500 hp. The analysis assumed 57 fins on the finned motor, each fin being 816 inches long, 0.5 inches in height, and 0.2 inches thick. The calculated internal temperature for the finned motor was 327.56° F. with an external temperature of 228.82° F., the calculated internal temperature was 711.77° F. for the unfinned motor with an external temperature of 613.04° F.

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Abstract

A submersible pumping system for use downhole, wherein the system includes a pump, an inlet section for receiving fluid, a pump motor, and heat transfer fins on the motor housing. The fins increase the heat transfer area of the motor thereby providing enhanced cooling of the motor.

Description

BACKGROUND[0001]1. Field of Invention[0002]The present disclosure relates to downhole pumping systems submersible in well bore fluids. More specifically, the present disclosure concerns an improved method of cooling pump motors used to drive the submersible pumping systems. Yet more specifically, the present disclosure involves enhancing the surface area of the pump motor for increasing the heat transfer between the pump motor and the well bore fluid flowing across the surface of the pump motor.[0003]2. Description of Prior Art[0004]Submersible pumping systems are often used in hydrocarbon producing wells for pumping fluids from within the well bore to the surface. These fluids are generally liquids and include produced liquid hydrocarbon as well as water. One type of system used in this application employs an electrical submersible pump (ESP). ESP's are typically disposed at the end of a length of production tubing and have an electrically powered motor. Often, electrical power may...

Claims

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Application Information

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IPC IPC(8): F04B17/03
CPCE21B4/003F04D29/588F04D13/10E21B43/128
InventorCOX, DON C.
OwnerBAKER HUGHES INC