Petroleum Technology Digest: Progressing cavity pumps: Insights from 14 years in a Southern Oklahoma waterflood ///

Oak Resources, Inc. (Oak) began employing progressing cavity pumps (PCPs) in the West Hewitt Penn Sand Unit, a waterflood in Southern Oklahoma, in September 1988. Unit wells produce 200 bfpd to 1,400 bfpd from about 2,100 ft. Initial PCP installation costs were found to be 25% below those of beam-pump units and electrical submersible pumps (ESPs). Electrical power savings are 5% below beam-pumped units and 35% below ESPs, for comparable production rates. Through an evolution of PCP configurations and designs, up to a seven-year stator life is now expected, with only minor repairs. Adjustable rates at the surface, low capital costs, low repair costs and high electrical efficiency make PCPs attractive in this type application.

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