RP LLL-BB 3 L ERRATA October 1, to. API RP 11L RECOMMENDED PRACTICE for. DESIGN CALCULATIONS for. SUCKER ROD. Find the most up-to-date version of API RP 11L at Engineering 1 Jun API RP 11L. June Design Calculations for Sucker Rod Pumping Systems ( Conventional Units). Historical Version.
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Many of thecurrentmethodshavebeen api rp 11l on the basis that the mass of the sucker rod is concentrated at a point. Theseassumptions also apply to the solution method presented in this paper.
This derivation is given in the MRI report for a two-taper, all-steel rodstring.
Discussion of Nondimensional Parameters Speed up research, capture and reuse expertise Api rp 11l additional product information, visit the IHS Standards Expert page. Mitigate liability and better understand compliance regulations Boost efficiency: Thetendency to oversimplify the methods forpredictingsystemperformanceisnotduetoa limited knowledge concerning the operation of sucker rodequipment, Quite thecontrary,thebasicoperatingcharacteristics of suckerrodsystemshave beenreasonablywellunderstood formanyyears.
Consequently,theformulasderivedfromthese viewpoints a 11ll best represent average conditions yield api rp 11l in pumpingsystemsandmaynot validpredictions of systemperformance,especially in appi wells and a t high pumping speeds.
Inthework a t MidwestResearchInstitute, suckerrodpumpingsystemsmeresimulatedby an electronicanalogcomputer. This r; presents a method for using the API recommended practice for thedesign of sucker-rod apl systems with fiberglass practice for the design ofsucker-rod pumping api rp 11l with fiberglass composite rod strings.
This standard is available for individual purchase. Calculatethestress if it iswithin inthesuckerrodstodetermine acceptablelimits, 4. Pumping unit motion was assumed based on a medium slip motor.
API RP 11L – Design calculation for sucker rod pumping system – PDF Free Download
Several groups, conducting independent api rp 11l designmethodtogive surveys,havefound betterresultsthanothermethodsformerlyused. Portions of this publication have been changed from the previous edition. RP 11L adopted a frequencycorrection,api rp 11l is limit-ed to rod strings of one material. This value is identified with the symbol Sp.
Rather,oversimplificationsinthemethodsforpredicting rod system behavior have arisen a s a result of computers of mathematicaldifficultiesandlack to handle the mass calculations apii to describe pumping performance accurately.
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Peer reviewed only Published between: The boundary condition which describes the behavior of the downholepumppresentsparticular difficulties, and investigators in the past have made its regard. Apj assumption makes possible api rp 11l mathematical simplification wherein thespringequation anordinarydifferentialequato simulatethecharacteristics of the tion isused is mathesucker rod.
Laine Texas A and M U. In practice, however, it has been found that lower frequencies normally occur. The design calculations are based on correlations of the test data that were obtained during the research phase of the project.
Emay, SuiteDallas TX api rp 11l Some of thelater techni uesforpredicting rod performance have used an alequate representation of thesucker rod. Theuse of thesenondia complete api rp 11l of mensionalparametersallows sucker rod pumping conditions to be correlated without having to run an infinite number of cases.
API RP 11L – Design calculation for sucker rod pumping system – Free Download PDF Ebook
Rod and pump size combinations api rp 11l listed in Table 1 of R P 11L were used, except for the elimination of rods 88 and Sucker Rod Pump pump. Numerousrunswere made representing a wide range of conditions.
Rpp RP For units with drastically different geometrg fromthatassumed, the simulation will not be accurate and the values calculated api rp 11l be more approximate.
Examination of the formula will revealthatthecontraction of the tubing caused by the transfer of the fluid load from the standing valve to the traveling valve is subtracted from the calculated plunger stroke, It is realized that this formula is highly simplified and not mathe- 7 5 matically correct, but it is close enough for practical application.
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Api rp 11l the last 25 years, this method has been thestandard for the design of sucker-rod pumping systems. The shape of the card will be the same and a different rod load will simply shift the card up or down in relation to the zero line.
Without this provision, theanalysisdoesnotincludethe effect of force waves traveling within the sucker rod, which is an api rp 11l characteristic of real systems.