The sucker rod is the slender rod of the pumping well, which is connected to the polished rod and the lower part of the sucker pump to transmit power.

The sucker rod is a slender component used in pumping wells, connecting the polished rod at the surface to the downhole pump. It serves as a critical link for transmitting mechanical power from the pumping unit to the oil pump located deep underground. Typically, each individual sucker rod has a length of 7.62 meters, 8 meters, or 9.14 meters, and is made from low-carbon alloy steel that undergoes quenching and tempering treatment to enhance its strength and durability. These rods are connected using internal thread couplings, extending through the well casing down to the piston of the subterranean pump. As the pump operates, the sucker rod moves up and down, enabling the extraction of oil from deep reservoirs. In many oil fields, the total length of the sucker rod string can reach around two kilometers, with some wells, like those in the Shengli Oilfield, extending over three thousand meters. As an essential part of the rod-pumping system, the sucker rod transmits the mechanical force required to operate the downhole pump. The entire sucker rod string is composed of dozens or even hundreds of individual rods joined by couplings. During operation, the rod string experiences asymmetric cyclic loading due to the reciprocating motion, while also being exposed to well fluids such as crude oil and produced water—some of which may contain corrosive elements. This combination of mechanical stress and chemical exposure often leads to fatigue fractures or corrosion fatigue failures. A broken sucker rod can significantly disrupt production, increase workover costs, and raise overall oil production expenses. Sucker rods have been in use for nearly a century. The earliest versions were made from natural materials like rattan, but the first metal sucker rod patent (U.S. 528168) was granted to Samuel M. Jones of Ohio on October 30, 1894. Over the past two decades, significant advancements have been made in the design and manufacturing of sucker rods worldwide. New materials such as multi-element alloy steels and fiberglass have been introduced, alongside advanced technologies like intermediate frequency induction heating, quenching systems, and infrared temperature monitoring. Automated production lines for non-rotating rod heads and coupling manufacturing have improved efficiency, while innovations in forging die design, external thread rolling, variable diameter elbows, and friction welding have enhanced product quality and performance. To meet the demands of modern oil production—such as large-scale pumping, deep well operations, heavy oil extraction, wax buildup prevention, and corrosion resistance—specialized sucker rods have been developed. These include ultra-high-strength rods, FRP (fiber-reinforced polymer) rods, hollow rods, KD-grade rods, continuous rods, electrically heated rods, wire rope rods, and aluminum alloy rods. Alongside these, various accessories have been designed to improve the reliability and lifespan of the rod strings, including high-strength polished rods, toothless clamps, rotating devices, shock absorbers, graphite-sealed boxes, roller couplings, centralizers, wax scrapers, weighted rods, anti-fall devices, and magnetic wax inhibitors. **Technical Principle** The core component of this system is the high-strength sucker rod coupling, which offers excellent tensile properties. The coupling size is typically 5/8", matching or exceeding the performance of the rod itself. To prevent electrochemical corrosion caused by wear, a sacrificial anode is used. This anode provides cathodic protection by supplying a continuous current to the protected structure through an electrolyte. The anode material gradually depletes as it sacrifices itself, effectively preventing corrosion damage to the rod. To protect the anode from being washed away or damaged by fluid flow, stainless steel sheaths are installed around the inner and outer joints of the rod and the anode body. Additionally, the coupling is made from high-nickel alloy, ensuring a smooth surface that enhances the longevity of the coupling. **Technical Parameters** - Size: 1", 7/8", 3/4", 5/8" - Supporting rod diameter: 25mm, 22mm, 19mm, 16mm - Centralizer outer diameter: Up to φ56mm - Sacrificial anode protection range: 50m - Effective power generation: ≥1.1 A.h/g - Anode consumption rate: ≤12.36 kg/A.a - Current efficiency: ≥65% **On-site Installation** When installing the sucker rod during operation, it should be connected using a threaded coupling. The installation section should be determined based on the degree of corrosion and eccentric wear in the well, with a protective device installed every 80–100 meters. For optimal performance, the anti-corrosion and anti-wear device works best when used in conjunction with the KXY-2 tubing cathodic protector and a standard nylon centralizer.

Metal Storage Rack

Storage Rack,cnc metal

Dongguan Shangen Precision Metal Plate Co., Ltd. , https://www.shangenmetal.com