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The API does not specify the minimum yield strength for sucker rods. The proper design will decrease the stress on the 11bbr above the bottom section. Makeup the connection to the hand-tight position. One of the earliest means used for designing tapered sucker-rod strings is in the Sucker Rod Handbook.
API RP 11BR Revisions on Sucker Rod Makeup
They are under stress on both the downstroke and the upstroke. However, typically only one grade of rod is used in the string to avoid mixing during running and pulling operations. 11be the pin and coupling threads for visual damage without removing thread lubricant. This coupling type, however, decreases the coupling area available for supporting the pumping loads. This is calculated as a static load.
They are most commonly placed adjacent to the polished rod at the top of the rod string, on top of the downhole pump for handling purposes, and on top of the polished rod with appropriate couplings to prevent the string from falling downhole if the polished-rod clamp slips. The development of the wave equation for sucker-rod lift by S.
These new methods utilize computerized rod tongs to measure applied torque and either the number of turns or the final displacement of the coupling to the pin shoulder.
The author is solely responsible for the content of the materials. Adjustments to the predictions should be made for future troubleshooting and any further design changes.
Apply the appropriate CD value for the rod size and grade. This is impractical, not only because of the manufacturing difficulties involved, but also because the lower rods must have sufficient stiffness to support the entire string in the tubing if failures occur high up in the string.
Usually, wells of the same type in a field can be grouped together and the necessary calculations do not have to be performed for each well. Any variation in lubricants or in the surface finish of the threads or mating surfaces drastically changes these percentages, indicating that torque could never be a precision makeup method for sucker rods.
Tapered rod strings that use different segments of different-sized rods are commonly used to save unnecessary weight and to distribute the loading on long strings of rods used in deep wells. This is especially problematic if field welds are made and the rods are used in an 11brr protected corrosive environment. Completely 1br the connection.
RP 11BR Archives – Production Technology
The values were determined based upon actual strain gauge readings and resulting stress calculations by an API industry workgroup reference R. The advent of the personal computer and its continued developments of power and speed allowed more developments of rod-string simulators, including: Fiber-reinforced plastic FRP sucker rods may be used instead of metal under certain conditions.
The taper percentages published in RP 11L were calculated from the Neely,  procedure by assuming several parameters like pumping speed, polished rod stroke length, etc. However, the ID of the seating nipple determines the fluid load that must be lifted to unseat the pump.
Recent discussions have promoted a hyperbolic relationship for allowable load using the Gerber parabola, rather than a straightline relationship. This results in a significantly decreased run life. These rods have a special heat treatment that should put the surface in a compressive set.
The fine-grain heat treatment done on these alloys theoretically should provide increased fatigue life. Thus, a full economic analysis should be conducted and good operating records obtained to determine if use of these rods is cost effective.
Steward  and Moore  discuss reasons for common sucker-rod string failures and provide discussion and pictures of the failures. Corrosion, scale, and paraffin deposits may accelerate such failures.
This method correlates strain guage readings in the laboratory versus the applied torsional load during makeup and the resulting movement of the coupling to provide the required connection preload stress.
The current edition provides for two classes of couplings: Where the yield strength of a rod string is necessary in calculations, it is recommended that if the manufacturer is not known, a minimum yield of 60, psi for Grade C and K and ofpsi for Grade D should be used.
The differences lead to the conclusion that an accurate rod string design should be based on calculations using actual pumping conditions. They also are standardized in size and performance by API Spec. The primary factor determining the proportion of each size of rod in the rod string is the size of the pump.
The need for carrying out actual rod designs is further augmented by limitations of the published taper percentages; note that taper lengths are the sole function of plunger size which is oversimplification of the design.
Rod strings should be designed to enable the operator to unseat the pump without yielding any rod in the rod string. A continuous strand of composite materials, called “ribbon rods,” was developed and field tested. Well equipment, including sucker rods, must be in good working condition.
Torque measurement has been discredited as a sucker-rod-connection 11bd method. Without applying new or additional thread lubricant, repeat steps 2, 3, 4, and 5 for 10 complete cycles. Because of the increased hardness and lower coefficient of friction, if properly surface treated, coupling-on-tubing wear is transferred from the rods—which are easy and less expensive to replace—to the softer tubing, which is more expensive to replace.
This is because it has to support the weight of the rest of the small-diameter rod load, the pump and the very large fluid load on the gross seating nipple area.