Various types of these rods are available, each designed to meet specific operational requirements and conditions in the oil and gas industry. Here are some common types:
Standard Sucker Rods
Standard sucker rods are the most commonly used type. They are made of high-strength carbon or alloy steel and come in different sizes and lengths. Standard rods are typically solid, meaning they have a continuous body without hollow sections.
The sucker rods are suitable for most well conditions and provide reliable performance in typical oil and gas production operations.
Hollow Sucker Rods
Hollow sucker rods have a hollow interior, offering advantages in specific well situations. They are lighter than standard sucker rods, which can reduce the load on the pumping unit and improve pumping efficiency.
Hollow sucker rods are often used in wells with high fluid volumes, viscous fluids or when there is a need to reduce the weight of the rod string.
Continuous Sucker Rods
Continuous sucker rods are specially designed for wells with deviated or crooked boreholes. These sucker rods have flexible joints or couplings that allow them to bend and accommodate the wellbore's shape without the risk of breakage.
Continuous sucker rods help minimize the stress and fatigue in deviated wells, ensuring reliable and continuous operation.
Spray Metal or Fiberglass Sucker Rods
Fiberglass or spray metal sucker rods are used in corrosive or high-temperature environments where traditional steel sucker rods may not be suitable. Spray metal rods are coated with a layer of corrosion-resistant material, such as aluminum, to protect against chemical reactions.
Fiberglass sucker rods are composite materials that offer excellent corrosion resistance and strength. These alternative materials provide durability and performance in harsh well conditions.
Polished Rods
Polished rods are not technically rods but are an integral part of the rod string. They connect the downhole pump to the rod string and transmit the reciprocating motion from the surface unit.
Polished rods are usually steel and have a smooth, polished surface to minimize wear and friction between the rod string and the pumping unit.
