Method for pumping fluids

Wells – Processes – Heating – cooling or insulating

Reexamination Certificate

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Details

C166S062000, C166S105000, C417S369000, C417S371000

Reexamination Certificate

active

10471462

ABSTRACT:
The production rate, useful life and operating efficiency of electric submergible pumping systems (ESP) is improved by operating the system so that the motor (220, 320) is cooled by two passes of production. Production fluids remove waste heat from the motor (220, 320) by passing the fluid in contact with the exterior of the motor (220, 320). The improved cooling permits the motor to be operated at a lower temperature improving life and efficiency, and/or to be operated at higher power at a similar temperature. Additionally, oversized and excess equipment is not required, further improving performance and economics for the user. In another aspect, the invention is a method of pumping fluids using a motor having vortex generators (366) on its exterior surfaces or on the interior surfaces of a surrounding shroud.

REFERENCES:
patent: 2697986 (1954-12-01), Meagher
patent: 3555319 (1971-01-01), Schaefer
patent: 4170436 (1979-10-01), Candler
patent: 4500254 (1985-02-01), Rozniecki
patent: 5017087 (1991-05-01), Sneddon
patent: 5068554 (1991-11-01), Mohn
patent: 5336070 (1994-08-01), Fujiwara et al.
patent: 5620048 (1997-04-01), Beauquin
patent: 5951262 (1999-09-01), Hartman
patent: 6000915 (1999-12-01), Hartman
patent: 6155345 (2000-12-01), Lee et al.
patent: 1541532 (1979-03-01), None
patent: 2070992 (1996-12-01), None
Inverted Pump Systems . . . , E. B. Brookbank, ESP Workshop Adam's Mark, Houston Apr. 26-28, 2000 (12 pp.).
Use of a Motor Cooling By-Pass System in an Electrical Submersible . . . , E. Sison, Feb. 28, 2000 (11 pp.).
A New Generation Electric Motor for Downhole Pumping Applications, Head et al., 2000 ESP Rountable (9 pp.).

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