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Typically, the rod-string section will be replaced after two or three failures, while the entire rod string may be replaced after three or four failures.
These factors should be considered when manual according to API RP 11L  or computer design calculations are performed to size the rod string and the related production equipment for a specific well. Despite having high strength and a small cross-sectional area, it was expensive and ran into field support problems similar to those of flexible strands and CORODs.
Thus, they could be 11brr in a hydrogen sulfide H 2 S environment in which the strength of Grade C rods is exceeded. The first number in the column refers to the largest rod size in the string, while the second number refers to the smallest rod size in the string, both representing the size in eighths of an inch. 11be 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.
Pony rods are sucker rods shorter than 25 ft, and they vary in length. Sufficient calculations need to be done to assess the economic impact for all wells in a field.
RP 11BR Archives – Production Technology
Columns 6 through 11 in Table D. 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. Completely disassemble the connection. Using four or more sizes of rods in a taper is not normally recommended.
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.
An SPE paper by Powers  considers the factors that enter into the decision about when to replace the entire rod string after sustaining the calculated number of failures. Worksheet 36 – Thermal Processes Review. Adjustments to the 11br should be made for future troubleshooting and any further design changes.
API RP 11BR Revisions on Sucker Rod Makeup
Apply the appropriate CD value for the rod size and grade. Stress raisers may be notches caused by improper handling, tool cuts, bending, and subsequent cold straightening, for example, and may also result from the manner in which the threads are formed on the rod pin i.
An allowable load or stress curve should be developed to discern during the design of a aip string if it is overloaded, and adjustments should be made to prevent this. There has been a long history of work trying to model or design sucker-rod strings.
This may reduce the required pumping-unit gearbox size and increase rod stretch because stretch is proportional to rod-string weight. Approximately 40 years ago, a top steel manufacturer experimented with the use of plastic-coated wire cable instead of sucker rods.
This overtravel approximately equals twice the expected value when using steel sucker-rod strings. One of the earliest means used for designing tapered sucker-rod strings is in the Sucker Rod Handbook. Fatigue of rods also was considered in The current edition provides for two classes of couplings: However, the reasons for failures need to be investigated and the root cause for this failure must be determined to extend the rod life in the future.
Other use of this presentation is prohibited without the expressed written permission of the author s.
Buoyancy of the rod string is not taken into account. In a noncorrosive environment, the endurance limit of steel is primarily determined by the maximum stress, the range of stresses, and the number of stress reversals. Those rods that have a special heat treatment or are made of special alloys are normally premium-priced items.
Corrosion, scale, and paraffin deposits may accelerate such failures. The connectors used at the pump or at the top of the sinker bars were the weakest portion apo the flexible strand.
These rods are normally made from protruded fiberglass. Steward  and Moore  discuss reasons for common sucker-rod string failures and provide discussion and pictures of the failures. Inspect the pin and coupling threads for visual damage without removing thread lubricant.
The rod string’s stretch in Table 4. 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. Care should be taken when recommending the SM couplings, even though they have longer wear life than T couplings.
The weak point in the string is this rod. These variables include, but are not limited to: