Presenters
Fred D. Griffin, Lufkin Foundry & Machine Company
The recently published API-RP-11L, Recommended Practice For Design Calculations for Sucker Rod Pumping Systems", takes into account many more well variables than were previously considered in sizing pumping equipment. This paper compares the new API method with the more conventional, simplified method which has been used for so many years. Direct comparisons are made between maximum polished rod load, minimum polished rod load and peak torque on the gear reducer. Both the API method and the older method are then compared with measured results taken from 77 wells covering a wide range of conditions.