Buy API 11BR: RECOMMENDED PRACTICE FOR THE CARE AND HANDLING OF SUCKER RODS from SAI Global. Find the most up-to-date version of API RP 11BR at Engineering Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at  API RP 11BR, Recommended Practice for Care and Handling of Sucker.
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API RP 11BR Revisions on Sucker Rod Makeup
Corrosion pits may have rounded or notched shape; notch-shaped pits are more serious and are more likely to occur in Grade D 11be than in Grade C rods. Further work by Hermanson  using the area relationships and allowable strength of the different grades of steel rods resulted in different derating factors, which are included in API RP 11BR. Sucker-rod strings are lifting a great deal of weight every cycle. Currently, there is no recognized formula for calculating overtravel when a mixed FRP and steel rod string is used.
API RP 11BR Revisions on Sucker Rod Makeup
11gr They are most commonly placed adjacent to the polished rod at the top of the rod string, on top of the downhole pump 111br 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. Despite having high strength 111br a small cross-sectional area, it was expensive and ran into field support problems similar to those of flexible strands and CORODs. Those rods that have a special heat treatment or are made of special alloys are normally premium-priced items.
They also are standardized in size and performance by API Spec. Pony rods are sucker rods shorter than 25 ft, and they vary in length.
However, a high tubing-casing-annulus fluid level decreases the load on the rod string when attempting to unseat a pump.
The Sponsoring Organizations cannot and do not warrant the accuracy of these documents beyond the source documents, although we do make every attempt to work from authoritative sources.
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.
qpi Maximum compression -5 ksi 3. These variables include, but are not limited to: Thus, while the SM couplings help to increase rod-string life, the tubing life may be decreased.
This method correlates strain guage readings 1b1r the laboratory versus the applied torsional load during makeup and the resulting movement of the coupling to provide the required connection preload stress. The author is solely responsible for the content of the materials. As with any specialty equipment, good field testing and records for several years in which good handling and operating practices were followed are required to prove the benefit for any of these non-API rods.
Thus, when placing the rod string with new suckers, new pony rods should be used. The following is a summary of the normal rod-string equipment and typical reasons for failure:. The tensile strength is generally greater thanpsi, while the yield strength is generally greater than apu, psi; therefore, these rods could not be classified as API Grade D. Friction in the pump holddown plus sediments in the pump-tubing 11gr increases the required pump-unseating force. Apply the appropriate CD value for the rod size and grade.
This method was provided to the industry in the s, and the design results were developed into the hand-calculation and graphical method in API RP 11L. The advent of the personal computer and its continued developments of power and speed allowed more developments of rod-string simulators, including: Because of the increased hardness and lower coefficient of friction, if properly wpi treated, coupling-on-tubing wear is transferred from the rods—which are easy apk less expensive to replace—to the softer tubing, which is more expensive to replace.
RP 11BR Archives – Production Technology
Manufacturers of non-API rods should specify the rod’s allowable stress. E due to arc P Columns 6 through 11 in Table 11vr. This includes the original work from Slonneger  and Mills  on vibration effects of rod strings.
The predicted loads should be compared to zpi actual loads and the associated fluid production. Subsurface equipment for sucker-rod lift. 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.
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.
Thus, more production may be possible from the well with a tapered string than a straight string using the same-diameter pump. This is calculated as a static load. Maximum tension 40 ksi Edward L. Thus, slimhole couplings are not as strong as the full size. An allowable load or stress curve should be developed to discern during the design of a rod string if it is overloaded, and adjustments should be made to prevent this.
Additionally, Hermanson  provides discussion and photographs of different rod failures.
This cable was a continuous strand that required special pulling equipment. Thus, a full economic analysis should be conducted and good operating records obtained to determine if aapi of these rods is cost effective.
Beforepercentages were calculated so that the unit stress on the top rod of each section from the weight of the rods in air plus the weight of the produced fluids on the gross plunger area is equal. The manufacturer of specialty or non-API rods should be consulted for their recommended CD values and makeup procedures.
The Case Study – Brandon L. This overtravel approximately equals twice the expected value when using steel sucker-rod strings.
The primary factors affecting the selection and sizing of rods and the rod system are as follows:.