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most up-to-date version of API RP 11BR at Engineering Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at  API RP 11BR, Recommended Practice for Care and Handling of Sucker.
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Other a;i of this presentation is prohibited without the expressed written permission of the author s. The most common rods in use will meet API specifications and will probably be in ft lengths.
The connectors used at the pump or at the top of the sinker bars were the weakest portion of the flexible strand.
If any of the strands furnished the weight that was required to help open the traveling valve, the strands immediately above the sinker bars failed in 11bf order because of the compressive forces.
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.
Old pony rods normally should a;i be used in the load-carrying part of a new rod strings. Currently, most operators and rod manufacturers have proprietary rod-string design programs that include these data. The proper design will decrease the stress on the rods above the bottom section. Pony rods are sucker rods shorter than 25 ft, and they vary in length.
The sucker-rod string is often highly stressed and usually fails because of the repeated load reversals. Sucker rods are a key component of a sucker-rod lift type of artificial lift system. The aip is solely responsible for the content of the materials. The advent of the personal computer and its continued developments of power and speed allowed more developments of rod-string simulators, including: Stress raisers may be notches caused by improper handling, tool apo, 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.
The biggest disadvantages that restricted the use of this type 1br string were lack of service-company support and the inability to make field repairs.
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. Without applying new or additional thread lubricant, repeat steps 2, 3, 4, and 5 for 10 complete cycles. The primary factors affecting the ai and sizing of rods and the rod system are as follows:.
Gibbs  in was a major step forward because its use permitted design or analysis for all types of units and rod strings.
Normally, the pulling-rig weight indicators are not accurate enough to use as the only tool to prohibit yielding the sucker rods. This coupling type, however, decreases the coupling area available for supporting the pumping loads.
API RP 11BR Revisions on Sucker Rod Makeup
The disadvantages include the need for a special wheeled pulling rig, and the two different pulling units are required to service the well if the tubing has to be pulled. Sufficient calculations need to be done to assess the economic impact for all xpi in a field. Care should be taken when recommending the SM couplings, even though they have longer wear life than T couplings. The following is a summary of the normal rod-string equipment and typical reasons for failure:.
E due to arc P This results in a significantly decreased run life. Maximum tension 40 ksi Edward L.
RP 11BR Archives – Production Technology
Subsurface equipment for sucker-rod lift. Using four or more sizes of rods in a taper is not normally recommended. Class T through hardened coupling has a Rockwell C hardness range of minimum 16 and maximum 11vr, and Class SM surface hardened has a minimum Rockwell C apk hardness of Replacing a rod string one rod at a time is not normally a good operating practice; thus, the economic life of a rod string needs to be considered if rods start to fail.
The current edition provides for two classes of couplings: Buoyancy of the rod string is not taken into account.
API RP 11BR Revisions on Sucker Rod Makeup
Tapered rod strings can be operated at a higher pumping speed N than straight rod strings. Clean and inspect the pin and coupling threads. These rods are normally made from protruded fiberglass. They also are standardized in size and performance by API Spec. The Case Study – Brandon L.
Preload no axial load 3 2.
Combining this with the normally corrosive environmental conditions of water, H 2 S, CO 2etc. Torque measurement has been discredited as a xpi makeup method. 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, a full economic analysis should be conducted and good operating records obtained to determine if use of these rods is cost effective.
The use of the API taper lengths, of course, saves the time of a detailed string design, but the wide availability apk personal computers today has eliminated the need to resort to such a shortcut method. Well equipment, including 11brr rods, must be in good working condition. The manufacturer of specialty or non-API rods should be consulted for their recommended CD values and makeup procedures.
This page discusses rod types, design of the rod string, couplings, maintenance and replacement. 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.