The "insulation pipe" for heavy oil thermal extraction, used in heavy oil thermal extraction (injecting steam) and geothermal wells, is a double-layer concentric special oil pipe consisting of an inner tube, an outer tube, and an intermediate insulation layer. Through double-layer vacuum insulation, it reduces heat loss from high-temperature steam and serves as a critical well column for high-temperature underground extraction.
Product specifications: 2-7/8″～4-1/2″
Grade: N80-1/Q, L80, P110
The inner pipe carries high-temperature steam (≤350–400°C). The intermediate insulation layer blocks the three modes of heat transfer: conduction, convection, and radiation, resulting in a lower thermal conductivity compared to ordinary steel pipes.
The inner tube is pre-stretched to apply tensile stress, compensating for thermal expansion at high temperatures to prevent pipe column bending and fracture, making it suitable for long-term operation in 300–400°C conditions.
The inner and outer tubes are made of N80/P110/super duplex steel, offering resistance to internal pressure, external compression, and corrosion from H₂S/CO₂.
Buttress threads + metal sealing ring ensure no leakage under high temperature and pressure conditions, with thermal insulation at the coupling area to reduce heat loss at joints.
By utilizing vacuum and multi-layer reflective shields, it suppresses conductive, convective, and radiative heat dissipation, reducing heat loss by 85% to 90% compared to single-layer ordinary oil pipes.
Reduce thermal shock to cement rings, minimize cracking of cement rings, extend the service life of casing tubes, and decrease the frequency of well intervention operations.
The pipe columns are not prone to bending, bulging, or instability. They can withstand multiple hot-cold cycles and are suitable for multi-cycle steam injection and shutdown alternating operating conditions.
With long-term expertise in the manufacturing of OCTG, we possess advanced equipment and large-scale production capabilities, enabling us to consistently deliver high-quality products.
With long-term expertise in the manufacturing of OCTG, we possess a reliable quality control system, ensuring stable and dependable product quality.
A professional technical service team, providing 24-hour response and on-site technical support for pipe construction operations, ensuring long-term efficient equipment operation.
