API 11BR PDF

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most up-to-date version of API RP 11BR at Engineering Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at [1] API RP 11BR, Recommended Practice for Care and Handling of Sucker.

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AISI or type steels, which have high tensile strengths. Rod strings should zpi designed to enable the operator to unseat the pump without yielding any rod in the rod string.

This page discusses rod types, design of the rod string, couplings, maintenance and replacement. However, they both show the same trends of cost versus torque accuracy. The values were determined based upon actual strain gauge readings and resulting stress calculations by an API industry workgroup reference R. Proper running, handling, and makeup procedures should be followed to secure maximum service from a rod string.

API RP 11BR Revisions on Sucker Rod Makeup

Effectively inhibited systems may be considered noncorrosive, which would limit the surface pitting of the steel rods or components. Sucker-rod strings are lifting a great deal of weight every cycle. This allows pumps to be run deeper than would be possible if just one size of rod was run.

Additionally, RP 11L, [3] discusses the need to reduce the allowable load or stress on used rods. The following is a summary of the normal rod-string equipment and typical reasons for failure:.

Sucker rods

Corrosion pits are one type of stress raiser. Currently, most operators and rod manufacturers have proprietary rod-string design programs that include these data. 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 11bbr.

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The diameter of the pump plunger determines the fluid load lifted during the pumping cycle.

Fatigue zpi rods also was considered in This is especially problematic if field welds are made and the rods are used in an inadequately protected corrosive environment. This method correlates strain guage readings in the laboratory versus the applied torsional load during makeup and the resulting movement of the apu to provide the required connection preload stress.

Worksheet 36 – Thermal Processes Review. 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. Additionally, Hermanson [11] provides discussion and photographs of different rod failures.

API RP 11BR Revisions on Sucker Rod Makeup

The first column of Table I in this reference contains the rod-string size designation. 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.

A continuous strand of composite materials, called “ribbon rods,” was developed and field tested. The primary factor determining the proportion of each size of rod in the rod string is the size of the pump. This coupling aapi, however, decreases the coupling area available for supporting the pumping loads.

The most common rods in use will meet API specifications and will probably be in ft lengths. However, typically only 1br grade of rod is used in the string to avoid mixing during running and pulling operations. Corrosion, scale, and paraffin ap may accelerate such failures. However, the ID of the seating nipple determines the fluid load that must be lifted to unseat the pump. These rods have a special heat treatment that should put the surface in a compressive set.

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Tapered rod strings can be operated at a higher pumping speed N than straight rod strings. Buoyancy of the rod string is not taken into account.

RP 11BR Archives – Production Technology

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.

In such cases, corrosion-fatigue failures occur frequently in the rod string. Combining this with the normally corrosive environmental conditions of water, H 2 S, CO 2etc.

Preload no axial load 3 2. Society of Petroleum Engineers. For good operating practices, the minimum yield strength should 11bbr be exceeded. If the manufacturer and rod type zpi known, the actual yield-strength values should be used. Pony rods are sucker rods shorter than 25 ft, and they vary in length. Those rods that have a special heat treatment or are made of special alloys are normally premium-priced items. 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.

Zaba [22] detailed the next refinement of sucker-rod loading, which was the organization of the Sucker Rod Pumping Research Inc. This is calculated as a static load. The downhole production strings may fail for a variety of reasons, some of which have been discussed previously. Inspect the pin and coupling threads for visual damage without removing thread lubricant.

Thus, while the SM couplings help to increase rod-string life, the tubing life may be decreased.