Find the most up-to-date version of API RP 11L at Engineering A 6-page educational info-graphic summarizing the most important principles underlying successful Rod Pumping Operation. Topics include: Downhole Pump . API RP 11L Recommended Practice for Design Calculations for Sucker Rod Pumping Systems (conventional Units). Front Cover. American Petroleum Institute.
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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.
If the pump displacement 11ll or anticiculated in step 14 fails to satisfy patedrequirements,appropriateadjustmentsmust be made in the assumed data and steps 1 through 14 repeated. Several groups, conducting independent this designmethodtogive surveys,havefound betterresultsthanothermethodsformerlyused. The simplifications in the mathematical model of suckerrodpumpingcan be groupedinto two broadcategories: It will usually be found necessary to make more wpi api rp 11l calculation to bring the 11k of the variouscomponents of theinstallationintoagreement.
RP 11L adopted a frequencycorrection,which is limit-ed to rod strings of one material. Advanced search Show search help. 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 of the motion of the system and the fluid-flow conditions in the pump.
This, of course, is an unreal assumption although the values for friction in this case should be minor and of negligible importance in the design. A mathematical evaluation of sucker-rod pumping, forpracticalpurposes,revolvesaround the development of equations to express the motion and the state of stress of sucker rods. Three forces of particular importance are determined from thecharts.
Tapered rod strings aretreated as uniform rods with the equivalent elasticity,and weight,of thetapered rod system. Pumping unit motion was assumed based on a medium slip motor.
When the calculated pump displacement is acceptable, proceed with the Design Calculation. Well flawing-off, I 2. Many of thecurrentmethodshavebeen developed on the basis that the mass of the sucker 11o is concentrated at a point. It will usually be found necessary to make more than one calculation to bring the limitations of the variouscomponents of theinstallationintoagreement.
Generally speaking, a higher slip prime mover results in slight decreases in the maximum load and a slight aoi in the minimum load but also tends to reduce the subsurface pump stroke; therefore! RP 11L adopted a frequencycorrection,which is limit-ed to rod strings of one material.
API RP 11L – Design calculation for sucker rod pumping system
Physical Characteristics of Sucker Rods c. Ai, was defined by Eq. This equationallows for apj stiffness of the couplings: The boundary condition which describes the behavior of the downholepumppresentsparticular difficulties, and investigators in the past have made its regard. Users of this publication should become completely familiar zpi its scope and content. For aquick comparison of design alternatives and for a general pr designalgorithm, RP 11L does an adequate job for both steel and composite rodstrings.
F1 is the fluidload plusthe maximum dynamic effect on the up stroke. Proceedings of an International Conference Submersible Technology: If a high degree of design accuracy is desired, the reader is referredto one of the many available api rp 11l simulators.
An average conventional atlon. Theundamped to naturalfrequency is showninvibrationtheory be inverselyproportional to thetimerequiredfor a force wave to make four traversals along the sucker rod. Theotherprogram developed a series of curves for selectingbeampumpingunits fordepths of f t to f t andvariousrates of production and and api rp 11l of rod sizes, pump sizes, speeds.
In some cases the changes are significant,whileinothercasesthechangesreflectminor editorial adjustments. This derivation is given in the MRI report for a two-taper, all-steel rodstring. The calculated value for torque w i l l not be even approximately right and a torque c a l d a tion must be made by 1l other method. At Pumping Speed, N c;?: Sucker Rod the research phase its dissoluPumpingResearch,Incorporated,before to Amertion, released these correlated test results ican Petroleum Institute for publication, This R e c m m d e d Practice for the Design Calculations of Sucker Rod PumpingSystems usingconventional pumpingunits is basedonthesecorrelations.
API RP 11L – Design calculation for sucker rod pumping system – PDF Free Download
Without this provision, theanalysisdoesnotincludethe effect of force waves traveling within the sucker rod, which is an important characteristic of real systems. This paper extends the MRI work toinclude rods constructed of more than one material. Solve for S, and PD: However,sincethismethod is basedonthebest coninterpretations of averagevalues,theactual ditionsfoundinindividualcasesmaynotalways yield valid predictions of pumping system performance.
Thecriteriagenerallyusedforthedesign of sucker rod installationsarebasedongreatly oveximplifled concepts of pumpingsystemmechanics.
The operating characteristics of the preliminary selection are calculated by use of the formulas, tables, and figures presented herein.