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most up-to-date version of API RP 11BR at Engineering Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at  API RP 11BR, Recommended Practice for Care and Handling of Sucker.
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The rod string’s stretch in Table 4. A detailed discussion and development of these formulas is spi by Zaba. The tables gained wide acceptance, and thousands of rod strings have been installed since then that used these recommended taper lengths. The advantage of this rod is its ability to pull the 11rb rod string in one piece with a special pulling unit. They should be selected for wells in which operating stresses do not exceed 50, psi.
It is important to keep the following in mind when screening a well for FRP-rod use:. The author is solely responsible for the content of the materials.
The first column of Table I in this reference contains the rod-string size designation. The tensile strength 11br generally greater thanpsi, while the yield strength is generally greater thanpsi; therefore, these rods could not be classified as API Grade D.
The manufacturer of specialty or non-API rods should be consulted for their recommended CD values and makeup procedures.
Rod strings should be designed to enable the operator to unseat the pump without yielding any rod in the rod string. The advent of the personal computer and its continued developments of power and speed allowed more developments of rod-string simulators, including: Effectively inhibited systems may be considered noncorrosive, which would limit the surface pitting of the steel rods or components.
There has been a long history of work trying to model or design sucker-rod strings.
Preload no axial load 3 2. Care should be taken when recommending the SM couplings, even though they have longer wear life than T couplings.
However, they both show the same trends of cost versus torque accuracy. For good operating practices, the minimum yield strength should not be exceeded.
Zaba  detailed the next refinement of sucker-rod loading, which was the organization of the Sucker Rod Pumping Aip Inc.
Stress raisers cause areas of concentrated stresses and may be caused by a number of things.
Thus, while the SM apj help to increase rod-string life, the 11rb life may be decreased. This cable was a continuous strand that required special pulling equipment. Pony rods are sucker rods shorter than 25 ft, and they ap in length. 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.
These rods have a special heat treatment that should put the surface in a compressive set. Currently, there is no recognized formula for calculating overtravel when a mixed FRP and steel rod string is used.
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.
Steward  and Moore  discuss reasons for common sucker-rod string failures and provide discussion and pictures of the failures.
RP 11BR Archives – Production Technology
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. Thus, when placing the rod string with new suckers, new pony rods should be used. 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.
They are under stress on both the downstroke and the upstroke. 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. 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. 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.
They also are standardized in size and performance by API Spec.
API RP 11BR Revisions on Sucker Rod Makeup
Friction in the pump holddown plus sediments in the pump-tubing annulus increases the required pump-unseating force. In such cases, corrosion-fatigue failures occur frequently in the rod string.
The top rod in the bottom section normally has the highest stress in the string because it has zpi smallest cross-sectional area. A number of manufacturers have developed higher-strength steel rods to compete with other specialty rods.
The current edition provides for two classes of couplings: The primary factors affecting the selection and sizing of rods and the rod system are as follows:. Maximum tension 40 ksi Edward L.
If the apo and rod type are known, the actual yield-strength values should be used. Recommendations are presented for derating based on the class of the inspected rod, according to the inspection-criteria classes in API RP 11BR. 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.
This enables operators to run 1-in.