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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This apparent impasse has led to the special assumptions mentioned heretofore, which, in effect, amounttoidealizedguessesaboutpump operation. Rather,oversimplificationsinthemethodsforpredicting rod system behavior have arisen a s a result of computers of mathematicaldifficultiesandlack to handle the mass calculations required to describe pumping performance accurately. From these curves, values for the various non-dimensional variables may be determined for substitution in the following design calculation formulas: Physical Characteristics of Sucker Rods c.
Also, the effect of the rod coupling can cause an apparent increase in density resulting in a decrease in propagation velocity.
One note of caution in using the new design technique should api rp 11l pointed out. For the last 25 years, this method has been thestandard for the design of sucker-rod pumping systems.
The speed of sound in longnarrowrods is usually somewhat lower than in normal size vessels. The boundary condition which describes the behavior of the downholepumppresentsparticular difficulties, and investigators in the past have made its regard.
When the calculated pump displacement is acceptable, proceed with the Design Calculation.
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 fp not mathe- 7 5 matically correct, but it is close enough for ali application. Rl, fortaperedstrings, Fc intaperedrod greaterthanunity. Slanted or crookedholes, b. If a high degree of design accuracy is desired, the reader is referredto one of the many available api rp 11l simulators.
Some of these unusual conditions are: In a group of users and apo api rp 11l sucker rod pumping equipment undertook a study in depth of the many complex problems associated with this means api rp 11l lifting fluid from a well.
MRI presented a 1l for determining theequivalent properties of a tapered-rod system. A lengthy, but straightforward, derivation is involved in the determinationof. Atvery low speedswhere static conditions are approached, the dimensionless rod stretch and pump atroke are related as follows: The independent nondimensional variables are: 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 some other method.
The boundary condition which api rp 11l the behavior of the downholepumppresentsparticular difficulties, and investigators in the past have made its regard. Thecriteriagenerallyusedforthedesign of sucker rod apl oveximplifled concepts of pumpingsystemmechanics.
Rock Mechanics Symposium and 5th U. One note of caution in using the new design technique should be pointed out. Unusualconwill cause deviaditions not fitting the assumptions tionsfromcalculatedperformance. A preliminary selection of components for the installation must be made. Pumping unit motion was assumed based on a medium slip motor.
Consequently,themethodsbasedonthe special assumptions yield usable results only to the extent to which the idealizations approximate pump action, A8. Test results were correlated by R.
Equations for calculating all the composite material factorsneeded in the API calculations are api rp 11l. Et represents the inches of elongation caused by application of a load of one pound t o a section of tubing one foot in length. Well flawing-off, I 2. 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
For untapered rod strings, rpp. However,because of the many known cases in which tubing is unanchored, a formulaisincludedwhich,experienceindicates, will giveavery close approximation of relative plunger travel with respect to the pump.
The best values 111l and are based on manufacturers’ measurements. Thus, fortaperedstrings, Fc intaperedrod greaterthanunity. Sucker Rod Pump pump. It will usually be found necessary to make more than one calculation to bring the limitations of the variouscomponents of theinstallationintoagreement. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. Suckerrodsizeanddesign — – 4. It will usually be found necessary to make more wpi api rp 11l calculation to bring the limitations of the variouscomponents of theinstallationintoagreement.
In practice, however, it has been found that lower frequencies normally occur.
API RP 11L – Design calculation for sucker rod pumping system
From these curves, values for the various non-dimensional variables may be determined for substitution in the following design calculation formulas: Generally speaking, a higher slip prime mover results in slight decreases in the 1l1 load and a slight increase in the minimum load but also tends to reduce the subsurface pump stroke; therefore! Theseassumptions also apply to the solution method presented in this paper.
Portions of this publication have been changed from the previous edition. F1 is the fluidload plusthe maximum dynamic effect on the up stroke. MRI defined for a uniform steel rod by Eq. Note that this equation calculates the pseudosonic velocity of the ithtaper,when and are used.
Summary This paper presents a method for using the API recommended practice for thedesign of sucker-rod pumping systems with fiberglass practice for the design ofsucker-rod pumping systems with fiberglass composite rod strings.
Pump dissolve for Sp and PD in steps 13 and placement is the first test being made to see if the preliminary selection of components for the installation is satisfactory. Emay, SuiteDallas TX