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== Aspects in Sucker Rod Pump Design Based on API TR 11L ==


Due to the elasticity of the rod, the rod string might strength or contract through the pumping cycle. This results in a downhole stroke length at the plunger "''S''<sub>p</sub>" that slightly differs from the design stroke length ''S''. This difference results in an actual flow "''q<sub>a</sub>''" that is different from the design flow rate ''"q"''. Based on API TR 11L, the rod stretch is predicted. "''q<sub>a</sub>''" is then calculated and is compared to the desired ''"q"''. The optimum ''"q"'' can then be reached with an iterative procedure. In the following, the procedure for this calculation is clarified:
1 - Determine the theoretical flow rate ''"q"'' from the pump speed "''N''", surface stroke length "''S''" , and plunger size "''d''<sub>p</sub>" as follows,
''q'' = (π/4''d''<sub>p</sub><sup>2</sup>''S'')''NF''.
where the term between brackets represents the volume displaced by the pump during a single cycle, while ''F'' is downhole pump efficiency.
2 - A primary selection of rod string design is required. Firstly, the total length of rod string approximately equals the pump setting depth ''L'' in non-literal wells. Moreover, the configuration of rod string diameters is determined from a standard set of configurations provided in API RP 11L. The standard provides a table of the characteristics of the tapered rod string. Figure 1 shows a portion of table 4.1 provided for rod string configuration and properties. The figure is a snapshot of the digitized table provided by the Petroleum Extension (PETEX®) of The University of Texas at Austin, which can be found [https://petex.utexas.edu/publications/600-beamlift-toolbox here] under the title “Beam Lift System Design Calculators.” In Figure 1, the last six columns are API sizes of rod diameters. The table numbers represent the percentage of each size in the making of the rod string. the first column is a list of configuration identifiers. Based on ''d''<sub>p</sub> determined in the previous step, a rod configuration is selected. The other information provided by the table for each rod configuration is
a. Rod weight  (lb/ft)
b. Elastic Constant  (in/lb.ft)
c. Frequency Factor  (-)
<gallery>
Example.jpg|Caption1
Example.jpg|Caption2
</gallery>

Latest revision as of 15:36, 24 August 2021

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