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most up-to-date version of API RP 11BR at Engineering Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at  API RP 11BR, Recommended Practice for Care and Handling of Sucker.
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Regardless of what method or program is used to predict loads, once the equipment is installed and the well has 11bbr production and fluid levels, it is recommended that a dynamometer ap be run with a load-capable dynamometer attached to the polished rod. Recent discussions have promoted a hyperbolic relationship for allowable load using the Gerber parabola, rather than a straightline relationship.
The accuracy in determining the applied torque value is cost dependent. Sucker-rod strings may be composed apii a single size or may be tapered, typically to include rods of two and three sizes. The author is solely responsible for the content of the materials. The downhole production strings may fail for a variety of reasons, some of which have been discussed previously. A detailed discussion and development of these formulas is provided by Zaba.
Reviewing this standard shows that temperature, load reversals, and fatigue life have a bigger effect on FRP rods than on steel rods.
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. Companies used this graphical chart and calculation method for many years, with some refinements and changes to the practice, to account for tapered-rod strings and rod percentages, that provide equal loading in each section of a string.
Chemical inhibition may not prevent embrittlement. This is calculated as a static load. Without applying new or additional thread lubricant, repeat steps 2, 3, 4, and 5 for 10 complete cycles. 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. However, they both show the same trends of cost versus torque accuracy.
This hardness is normally accomplished by the spray-metal process.
API RP 11BR Revisions on Sucker Rod Makeup
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. 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. The rod string’s stretch in Table 4.
API RP 11BR Revisions on Sucker Rod Makeup
Additionally, Hermanson  provides discussion and photographs of different rod failures. This page discusses rod types, design of the rod string, couplings, maintenance and replacement.
This may reduce the required pumping-unit gearbox size and increase rod stretch because stretch is proportional to rod-string weight. In such cases, corrosion-fatigue failures occur frequently in the rod string.
The fine-grain heat treatment done on these alloys theoretically should provide increased fatigue life. Columns 6 through 11 in Table D.
They are under stress on both the downstroke and the upstroke. Makeup the connection to the 111br position. One of the earliest means used for designing tapered sucker-rod strings is in the Sucker Rod Handbook.
Thus, more production may be possible from the well with 11hr tapered string than a straight string using the same-diameter pump. The proper design qpi decrease the stress on the rods above the bottom section. A continuous strand of composite materials, called “ribbon rods,” was developed and field tested.
Worksheet 36 – Thermal Processes Review. 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.
The manufacturer of specialty or non-API rods should be consulted for their recommended CD values and makeup procedures. Using four or more sizes of rods in a taper is not normally recommended. However, a high tubing-casing-annulus fluid level decreases the load on the rod string when attempting to unseat a 111br. Care should be taken when recommending the SM couplings, even though they have longer wear life than T couplings.
Class T through hardened coupling has a Rockwell C hardness range of minimum 16 and maximum 23, and Class Apl surface hardened has a minimum Rockwell C surface hardness of Fiber-reinforced plastic FRP sucker 11vr may be used instead of metal under certain conditions.
The top rod in the bottom section normally has the highest stress in the string because it has the smallest cross-sectional area. Thus, when placing the rod string with new suckers, new pony rods should be used.
The tensile strength is generally greater thanpsi, while the yield strength is generally greater thanpsi; therefore, these rods could not be classified as API Grade D. However, the reasons for failures need to be investigated and the root cause for this failure must be determined 11br extend the rod life in the future.
RP 11BR Archives – Production Technology
The most common rods in use will meet API specifications and will probably be in ft lengths. 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 tables gained wide acceptance, and thousands of rod strings have been installed since then that used these recommended taper lengths.
If the environment is corrosive and not properly treated, the sucker rods and their associated downhole equipment life is minimal. The first column of Table I in this reference contains the rod-string size designation. This work used the dynamic effects on the rod’s upstroke and downstroke, along with assumed pumping speeds for varying stroke lengths. Non-API sucker rods generally fall into two groups: