The thermal insulation tubing is a specialized double-layer concentric pipe designed for heavy oil thermal recovery (steam injection) and geothermal wells. It consists of an inner tube, an outer tube, and an intermediate insulating layer, with the interlayer filled with vacuum, inert gases, or aerogels. Its primary function is to minimize heat loss from high-temperature steam, making it a dedicated pipe for high-temperature, high-pressure downhole applications.
Product Specifications: 2-7/8″ to 4-1/2″
Steel grade: N80 1/Q, L80, P110
The thermal insulation pipe serves as the "insulation tube" for heavy oil thermal recovery. With its double-layer vacuum insulation design, it reduces heat loss, protects the casing, enhances production efficiency, and lowers energy consumption, making it a critical component of high-temperature downhole production systems.
The inner tube carries high-temperature steam (≤350–400°C), while the intermediate insulation layer prevents all three modes of heat transfer—conduction, convection, and radiation—with a thermal conductivity 90% lower than that of conventional steel pipes.
The inner pipe is pre-stressed to compensate for thermal expansion at high temperatures, preventing column bending or fracture and enabling long-term operation under 300–400°C conditions.
Both inner and outer tubes are made of N80/P110 super duplex steel, with an internal pressure resistance of ≥32 MPa, external extrusion resistance of ≥20 MPa, and resistance to H₂S/CO₂ corrosion.
Trapezoidal thread with a metal sealing ring ensures no steam leakage under high temperature and pressure, provides thermal insulation at the joint interface, and minimizes heat loss.
Reduces steam heat loss from 25–30% to 10–15%, enhances wellbore steam dryness (≥70%), and increases production by 15–25%.
Reduces thermal stress on the casing, prevents deformation and rupture, and extends wellbore service life by 2 times.
Reduced boiler steam consumption by 20% per ton of oil, minimized well maintenance operations, and lowered overall costs by 15%.
Strictly adheres to the API 5CT standard, ensuring stable and reliable quality.
With years of expertise in oil casing processing and manufacturing, the company boasts advanced equipment, precision testing instruments, and large-scale production capabilities, delivering products of exceptional quality.
Our professional technical team provides rapid after-sales support to ensure the safe and efficient operation of products.
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