Zumi The MRI method is limited to rodstrings constructed entirely of steel. Theotherprogram developed a series of curves for selectingbeampumpingunits fordepths of f ep to f t andvariousrates of production and and combinations of rod sizes, pump sizes, speeds. This value is identified with the symbol Sp. Fz is the dynamic effects during the down stroke taken away from the api rp 11l on the polished rod. The developis mathematically ment of representativeformulas complicatedbecause of thedifficulty of expressing boundary conditions which suitably reflect the openingandclosing of thevalves of thepumpwhen these are themselves a function aip the motion of the system and the fluid-flow conditions in the pump.
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More info In a group of users and manufacturers of sucker rod pumping equipment undertook a study in depth of the many complex problems associated with this means of lifting fluid from a well. To control and direct the effort, Sucker Rod Pumping Research, Incorporated, a non-profit organization was created. The services of Midwest Research Institute at Kansas City were retained to perform the work necessary to achieve the objectives of the organization. The design calculations are based on correlations of the test data that were obtained during the research phase of the project.
Sucker Rod Pumping Research, Incorporated, before its dissolution, released these correlated test results to American Petroleum Institute for publication.
Three discussions included in the final reports of test results by Midwest Research Institute have been published for permanent reference in API Drilling and Production Practice , p. Vibration Characteristics of Sucker-rod Strings b. Physical Characteristics of Sucker Rods c. One program developed tabular material calculated for depths of ft to 12, ft in increments of ft and for production rates of barrels per day to over barrels per day in varying increments.
Rod and pump size combinations as listed in Table 1 of RP 11L were used, except for the elimination of rods 88 and All API stroke lengths are covered. The other program developed a series of curves for selecting beam pumping units for depths of ft to ft and various rates of production and combinations of rod sizes, pump sizes, and speeds.
Generally, the limiting factor on the curve is the peak torque rating of the unit. American Petroleum Institute API Recommended Practices are published to facilitate the broad availability of proven, sound engineering and operating practices. These Recommended Practices are not intended to obviate the need for applying sound judgment as to when and where these Recommended Practices should be utilized.
The formulation and publication of API Recommended Practices is not intended to, in any way, inhibit anyone from using any other practices. Any Recommended Practice may be used by anyone desiring to do so, and a diligent effort has been made by API to assure the accuracy and reliability of the data contained herein. However, the Institute makes no representation, warranty, or guarantee in connection with the publication of any Recommended Practice and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use, for any violation of any federal, state or municipal regulation with which an API recommendation may conflict, or for the infringement of any patent resulting from the use of this publication.
API RP 11L
API RP 11L PDF