Double Hollow Sucker Rod
價格：元
The Coaxial Double Hollow Sucker Rod features an independent hollow channel within the standard hollow rod. Special terminal fittings connect the two channels with bidirectional sealing. The outer pipe is made from high-quality alloy steel processed using specialized techniques, while the inner pipe consists of a dual-layer stainless steel body filled with aerospace-grade inorganic hollow particles and coated with a micrometer-level polyurethane composite. This design forms a fully insulated closed-loop circulation system, with a thermal conductivity of less than 0.02, ensuring that the circulating heat transfer medium remains isolated from the wellbore, providing excellent thermal insulation.