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most up-to-date version of API RP 11BR at Engineering Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at  API RP 11BR, Recommended Practice for Care and Handling of Sucker.
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These rods take advantage of the newer alloys and heat-treating procedures currently available and are based on American Iron and Steel Inst.
Maximum tension 40 ksi Edward L. 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. An SPE paper by Powers  considers the factors that enter into the decision about when to replace the entire rod string after sustaining the calculated number of failures. They are under stress on both the downstroke and the upstroke.
The three main grades of steel rods follow:. 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. 11nr sections — continued. This cable was a continuous strand that required special pulling equipment.
The accuracy in determining the applied torque value is cost dependent. Effectively inhibited systems may be considered noncorrosive, 11be would limit the surface pitting of the steel rods or components.
Normally, the pulling-rig weight indicators are not accurate enough to use as the only tool to prohibit yielding the sucker 11rb. Tapered rod strings can be operated at a higher pumping speed N than straight rod strings.
Makeup the connection to the hand-tight position. The advantage of this rod is its ability to pull the entire rod string in one piece with a special pulling unit. Fiber-reinforced plastic FRP sucker rods may be used instead of metal under certain conditions.
API RP 11BR Revisions on Sucker Rod Makeup
The 11bt of the API taper lengths, of course, saves the time of a detailed string design, but the wide availability of personal computers today has eliminated the aapi to resort to such a shortcut method. 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.
Tapered 11br 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. Manufacturers of non-API rods should specify the rod’s allowable stress. The top rod in the bottom section normally has the highest stress in the string because it has the smallest cross-sectional area.
Corrosion, scale, and paraffin deposits may accelerate such failures. This results in a significantly decreased run life. The biggest disadvantages that restricted the use of this type of string were lack of service-company support and the inability to make field repairs.
The development of the ai equation for sucker-rod lift by S. Sucker-rod strings are lifting a great deal of weight every cycle. However, a high tubing-casing-annulus fluid level decreases the load on the rod string when attempting to unseat a pump.
Documents Flashcards Grammar checker. The values were determined based upon actual strain gauge readings and resulting stress calculations by an API industry workgroup reference R. The diameter of the pump plunger determines the fluid load lifted during the pumping cycle. Reviewing this standard shows that temperature, load reversals, and fatigue life have a bigger effect on FRP rods 11bd on steel rods.
This hardness is normally accomplished by the spray-metal process. Thus, a full economic analysis should be conducted and good operating records obtained to determine if use of these rods is cost effective. 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.
It is important to keep the following in mind when screening a well for FRP-rod use:. Proper running, handling, and makeup procedures should be followed to secure maximum service from a rod string.
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. Thus, while the SM couplings help to apl rod-string life, the tubing life may be decreased. 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.
Clean and inspect the pin and coupling threads. The predicted loads should be compared to the actual loads and the associated fluid production.
RP 11BR Archives – Production Technology
This type of rod string was less expensive than a normal API steel string and was found useful for unloading gas wells. The connectors used at the pump or at the top of the sinker bars were the weakest portion of the flexible strand. The API does not specify the minimum yield strength for sucker rods.
However, the ID of the seating nipple determines the fluid load that must be lifted to unseat the pump. 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.