Non-metallic lined tubing is a corrosion-resistant and wear-resistant composite pipe with a layer of non-metallic materials (e.g., plastic, ceramic, or glass) applied to the inner wall of standard API steel tubing, specifically designed to address three major challenges in oil fields: corrosion, scaling, and rod-tube wear.
Product Specifications: 2-7/8″ to 3-1/2″
Steel grade: N80, L80
Based on the liner substrate and operating conditions, they are classified into three categories: room temperature, high temperature, and ultra-high temperature.
Base material: High-density polyethylene with a molecular weight of 200,000–800,000
Operating conditions: Underground temperature ≤70°C, well depth ≤1500 meters
Advantages: Wear-resistant/age-resistant/resistant to weak acids and alkalis; features a proven anti-aberrant wear solution.
Base material: Ultra-high molecular weight polyethylene (UHMWPE) with a molecular weight of 1.5–2.5 million, exhibiting excellent comprehensive performance.
Operating conditions: Long-term use at temperatures below 100°C, suitable for well depths below 2200 meters.
Advantages: Friction coefficient of 0.07–0.11, comparable to PTFE, with self-lubricating properties; resistant to weak acids/alkalis and corrosive environments containing H₂S and CO₂; wear resistance is six times that of HDPE, effectively addressing wear issues.
Base material: Composed of a blend of various specialized nylon copolymers, it represents a novel high-performance nylon polymer material with exceptionally stringent processing requirements.
Operating conditions: Softening temperature> 200°C; long-term underground use at 130°C (at a depth of 3,200 meters).
Advantages: Tensile strength>45 MPa, elongation>300%, hardness>70 – demonstrating excellent performance; wear resistance is twice that of HDPE (high-density polyethylene), with longer service life; odorless and non-toxic, causing no environmental pollution, making it more suitable for construction applications.
The friction coefficient of ultra-high molecular weight polyethylene casing pipes for oil wells ranges from 0.07 to 0.11, exhibiting low friction, anti-scaling properties, and self-lubricating characteristics.
It exhibits excellent chemical resistance, thereby reducing corrosion of the tubing caused by various chemical agents present in the wellbore and extending the service life of the tubing.
The ultra-high molecular weight polyethylene casing tubing exhibits seven times greater wear resistance than carbon steel, significantly reducing the friction coefficient between the sucker rod and tubing, making it a highly effective solution for preventing eccentric wear.
Conventional polyethylene pipes exhibit poor heat resistance and are suitable for transporting cold water; in contrast, the copolymerized nylon-lined ultra-high-temperature pipe demonstrates wear and corrosion resistance up to 200°C, ensuring that the composite pipe maintains its original shape even under high-temperature well cleaning conditions.
Prevent wall thinning, perforation, leakage, and production shutdowns caused by corrosion, significantly reducing safety risks and environmental hazards.
Reduce the frequency of pipe cleaning, hot washing, and chemical dosing to lower operational costs and ensure long-term stable transportation efficiency.
Extending the pump inspection interval, reducing the number of operations, lowering maintenance and material costs, and enhancing overall economic efficiency.
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