However, when sucker rod is double stage rod, the resonant phenomenon of fiberglass rod is more likely to happen than other rods. In this paper, considering the static and dynamic and friction forces of the rod, the tube, and the liquid column, we established a mathematical calculation model named 3D dynamic wave model which was made up of a
stressed sucker rods, unanchored or improperly anchored tubing or some combination of the preceding. Abrasive wear causes rod string failures by reducing the cross-section of the metal, exposing new metal surfaces to corrosion and causes sucker rod connection failures from impact and shoulder damage. In Figure 2, the Class T coupling API RP 11BR Revisions on Sucker Rod MakeupAPI RP 11BR Revisions on Sucker Rod Makeup The successful application of threaded and coupled rods to provide power to lift downhole fluids is critically dependent on proper makeup procedures. This is applicable whether the pump is a reciprocating, positive displacement sucker rod lift system or a
Apr 17, 2018 · The richest diagnosis tool for the sucker rod pumping system, the most common way for oil artificial lift, is the downhole dynamometer card . It is a closed curve formed by displacement values of the sucker rod and the load values in the junction of the sucker rod and pumping unit generated in each pumping cycle . Advanced Materials Research Vols. 295-297 p. 14 Abstract:Multiple types of analysis and examinations are applied to analyze the causes of rupture for a sucker rod made of 20CrMo alloy. Based on the results from macro- and micro-fracture analysis, chemical composition analysis, mechanics test and metallographic examination, the generation of cracks can be attributed to the irregularity and impurity in the coating of sucker rod; the stress
sucker rod, which was vertical to axis. The combination of radial force, inertial force and resistance makes sucker rod bent. Thus, the phenomenon of eccentric wear will be heavier and rupture of sucker rod will always happen, which has become the major problem in Polymer flooding Wells production. So, it has practical signi- Failure analysis of a sucker rod fracture in an oilfield Jan 01, 2020 · In the oilfield, after 729 days of service, the sucker rod failed to break and failure. The fracture position is located at the welding seam which connecting the upsetting end of the sucker rod with the polished rod, and its macroscopic morphology was shown in Fig. 1.Polished rod model is 38 mm × 11 mm, the grade is HL, material made of 35CrMo and welding methods was friction welding.
Jan 01, 2020 · The fracture process and causes of the sucker rod were analyzed. Under cyclic loading and stress concentration, the outside weld of the rod brittle cracking at first and then fatigue cracking at last. The causes of sucker rod breaking for it did not meet the requirements of the HL grade rod material and the friction welding defects. Fracture analysis of a connecting rod for oil pumping unit Nov 01, 2019 · A large number of literatures have studied the modeling of pumping unit system, especially modeling of the rod pumping system [, , , , , ], but very few articles study on the sucker rod failure. Failure of sucker rod coupling or tubing is a major problem in sucker rod pumping systems, which occurs constantly in oil fields around the world [ 7 ].
sucker-rod pumps. These are :a) drive motor, b) pumpjack with gear reducer, c) polished rod, d) the sucker rod string and e) the subsurface pump shown in figure 1. Fig 1. Sucker-rod pumping system  The sucker rods are made of a full-profile round section of high-quality steel and serve to transfer power from the surface to the Managing Downhole Failures in a Rod Pumped WellJan 26, 2016 · b. The installing of rod guides created much more friction, which increased the loads and stresses in the sucker rod string and the possibility of rod failure. Due to high loads, there was no way to increase pumping parameters in order to increase production. - Valve rod guide worn-out Due to buckling - Metal to Metal contact - High friction 26.
In the past, fiberglass wasnt considered a good material for sucker rods. However, the manufacture and quality of rods made from that material has greatly improved. A rod string using fiberglass does require a few steel rods. These are at the bottom of the string, connecting it to the pump. SPE SPE-134975-PP Sucker-Rod Pumping Failures developed based on Failure Root Cause Analysis. A Sucker-rod pumping ontology that describes the domain, including:equipments, failures modes and causes was developed to support the failures diagnostic system. It collects, organizes and integrates data about pulling service, failures, diagnosis, and technical observations and uses a
Abrasive wear causes rod string failures by reducing the cross-section of the metal, exposing new metal surfaces to corrosion and causes sucker rod connection failures from impact and shoulder damage. In Figure 2, the Class T coupling on the left and the Class SM couplings (2A and 2B) are examples of Sucker Rod Chemical, Grade and Strength ChartThe sucker rod is utilized in the oil and gas industry to connect the surface and downhole compositions of an interchanging piston pump mounted in an oil well.. It is usually made of steel with threaded ends and measures from 25 to 30 feet long. A series of interconnected sucker rods connect the downhole pump deep down the well to the visible pumpjack above the ground that serves as drive for
Sucker Rods. Engineered to last, our rods are the best performing sucker rods on the market today, allowing wells to produce at optimum levels longer. Our steel sucker rods, and pony rods are manufactured to the highest quality standards to ensure reliable, Sucker-rod lift - PetroWikiJan 19, 2016 · The more-generic name of sucker-rod lift, or sucker-rod pumping, should be used to refer to all types of reciprocating rod-lift methods. Linked rods attached to an underground pump are connected to the surface unit. The linked rods are normally called sucker rods and are usually long steel rods, from 5/8 to more than 1 or 1 1/4 in. in diameter.
Stress corrosion makes pits from cracks; the expansion of such corrosion pits reduces the size of effective loading area; and the failure to endure service load due to the reduction of loading area finally causes sudden rupture of the rod.