Stainless Steel Coil Tube for Large-Diameter Casing Sand Removal Cleaning
Product Overview
The Stainless Steel Coil Tube (Product No. 1564), manufactured by Wenzhou Jixing Metal Materials Co., Ltd., is a specialized continuous-length tubing product engineered for demanding industrial applications, particularly in the sand removal and cleaning of large-diameter casings in oil and gas well operations. Unlike conventional cut-to-length pipes, coil tubes are produced in continuous, coiled form, eliminating weld seams along the longitudinal axis and thereby providing superior structural integrity, hydraulic performance, and resistance to erosion under high-flow conditions.
This product has been extensively validated in field operations where large-diameter well casings (typically 9-5/8" and above) require periodic sand removal to maintain optimal production rates and flow efficiency. The coil tube configuration enables rapid deployment of cleaning tools and jetting assemblies, reducing operational downtime and maximizing cost-effectiveness in well maintenance workflows.
Material & Properties
The coil tube is fabricated from high-grade austenitic stainless steel, selected for its outstanding combination of corrosion resistance, mechanical strength, and formability under continuous coiling conditions.
- Base Material: Austenitic Stainless Steel (commonly AISI 304, AISI 316, or 316L grades)
- Corrosion Resistance: Excellent resistance to chlorides, sulfides, and brine solutions encountered in downhole environments; the presence of Molybdenum (Mo) in 316/316L grades provides additional pitting and crevice corrosion protection
- Mechanical Properties: High tensile strength (≥ 515 MPa for 304 grade), adequate ductility (elongation ≥ 40%), and fatigue resistance suitable for repeated pressure cycling
- Chemical Composition: Low Carbon (C ≤ 0.08%) formulation minimizes intergranular sensitization during forming; Nickel (Ni) and Chromium (Cr) content ensure stable austenitic microstructure
- Surface Condition: Polished or pickled-and-passivated interior surface to minimize sand adhesion and facilitate debris removal
- Temperature Range: Suitable for service from cryogenic temperatures up to 870°C (1600°F)
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Category | Stainless Steel Coil Tube (盘管 / Coiltube) |
| Product No. | 1564 |
| Outer Diameter (OD) | Customizable; typical range 3/8" – 4" (10 mm – 100 mm) |
| Wall Thickness | 0.5 mm – 6.0 mm (customizable per application) |
| Coil Length | Continuous coil, typically 100 m – 500 m per coil |
| Coil Weight | Up to 2,000 kg per coil (standard); heavy coils available upon request |
| Material Grades | AISI 304, 304L, 316, 316L, 321, 347, Duplex 2205 (upon request) |
| Manufacturing Method | Seamless (Piercing / Mannesmann) or Welded (ERW / LSAW) coil forming |
| Surface Finish | Pickled & Passivated (2B), Polished (4K / 8K), or Matte |
| Pressure Rating | Up to 15,000 PSI (subject to OD and wall thickness combination) |
| Tolerance | OD: ±0.05 mm; Wall: ±10% (or per ASTM / ASME standards) |
| Applicable Standards | ASTM A213, ASTM A269, ASME B36.19M, ISO 13679, EN 10216-5 |
| Packaging | Wooden coil stand with moisture-proof wrapping; export-grade packaging available |
Manufacturing Process
The production of stainless steel coil tubes follows a rigorously controlled multi-stage process to ensure dimensional accuracy, metallurgical quality, and surface integrity:
- Raw Material Selection: High-purity stainless steel slabs or billets are procured from certified suppliers, with each lot undergoing spectroscopic analysis (OES) to verify chemical composition compliance.
- Heating & Homogenization: Slabs are heated to 1,150°C – 1,250°C in a controlled-atmosphere furnace, ensuring uniform temperature distribution and proper austenitization.
- Piercing / Hot Rolling: For seamless coil tubes, the heated billet is pierced using the Mannesmann process to form a hollow tube. The tube is then hot-rolled to approximate dimensions.
- Cold Drawing / Cold Rolling: The hot-rolled tube undergoes cold reduction to achieve precise final dimensions, improved surface finish, and enhanced mechanical properties. This step is critical for achieving the tight tolerances required in sand removal applications.
- Pickling & Passivation: The tube is subjected to acid pickling (typically nitric-hydrofluoric acid mixture) to remove oxide scale, followed by passivation to form a protective chromium oxide layer on the surface.
- Coiling: The finished tube is wound onto a coil stand under controlled tension to maintain dimensional stability. Coiling parameters (tension, speed, layer alignment) are precisely monitored to prevent kinking or deformation.
- Quality Inspection: Each coil undergoes comprehensive non-destructive testing (NDT), including eddy current testing (ECT), ultrasonic testing (UT), and hydrostatic pressure testing, to detect internal and external defects.
- Packaging & Dispatch: Qualified coils are wrapped, crated on wooden stands, and prepared for shipment with full documentation including mill test certificates (MTC).
Applications
The primary application of this coil tube product is in the sand removal and cleaning of large-diameter oil and gas well casings, where the following operational scenarios are addressed:
- Well Casing Sand Removal: The coil tube serves as the conduit for delivering high-pressure cleaning fluids (water, chemical slurries, or abrasive mixtures) into large-diameter casings. Its seamless construction prevents fluid leakage and ensures maximum jetting pressure at the tool face, effectively dislodging accumulated sand and debris from casing walls.
- Downhole Jetting Tools: Coil tubes are fabricated into jetting sub-assemblies and cleaning nozzles that are deployed via coiled tubing units (CTU) into production wells. The continuous nature of the coil allows for rapid deployment without the need for make-up connections, reducing the risk of leaks under high-pressure conditions.
- Drainage & Fluid Transfer: During and after sand removal operations, the coil tube is used to drain residual fluids and sand-laden mixtures from the wellbore, facilitating efficient cleanup.
- Chemical Injection: The coil tube can be used to deliver chemical cleaning agents (acid solutions, scale inhibitors) to specific intervals within the casing, enabling targeted treatment of scale and corrosion products.
- General Industrial Applications: Beyond oil and gas, this coil tube finds applications in chemical processing, food and beverage piping, pharmaceutical equipment, heat exchanger tubes, and structural tubing in marine and automotive industries.
Unique Selling Points
- Seamless Construction: The absence of longitudinal weld seams provides superior pressure containment and eliminates potential failure points during high-pressure sand removal operations.
- Continuous Coil Format: Enables rapid deployment and retrieval without connection make-ups, significantly reducing operation time and improving HSE (Health, Safety, and Environment) performance in the field.
- Customizable Specifications: Wenzhou Jixing Metal Materials Co., Ltd. offers full customization of OD, wall thickness, material grade, and coil length to match specific well conditions and cleaning requirements.
- Proven Field Performance: The product has been validated through practical field operations in large-diameter casing sand removal, with documented success in restoring well productivity and extending casing service life.
- Cost-Effective Solution: Compared to conventional pipe-and-coupling systems, the coil tube format reduces material waste, eliminates threading costs, and minimizes handling time, delivering superior total cost of ownership (TCO).
- Corrosion Resistant: The austenitic stainless steel composition ensures long service life in harsh downhole environments characterized by high salinity, sulfide presence, and elevated temperatures.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system and adheres to internationally recognized standards:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and continuous improvement
- ISO 14001:2015 — Environmental Management System certification demonstrating commitment to sustainable manufacturing practices
- API 5CT / API 5L — Compliance with American Petroleum Institute standards for casing and tubular products
- ASTM / ASME — Full compliance with applicable ASTM (American Society for Testing and Materials) and ASME (American Society of Mechanical Engineers) specifications
- NACE MR0175 / ISO 15156 — Compliance for resistance to sulfide stress cracking (SSC) in sour service environments
- Mill Test Certificate (MTC / EN 10204 3.1): Every shipment is accompanied by a full material traceability document including chemical analysis, mechanical test results, and NDT reports
- Third-Party Inspection (TPI): Available upon request — SGS, BV, or TUV inspection services can be arranged for additional quality assurance
Technical Note: Coil Tube Application in Large-Diameter Casing Sand Removal
In large-diameter casing sand removal operations, the coil tube plays a critical role in delivering cleaning fluids at controlled pressure and flow rates. The recommended approach involves selecting a coil tube OD and wall thickness combination that balances pressure containment capacity with flow area requirements. For typical 9-5/8" and 13-3/8" casing sizes, coil tubes in the range of 1-1/4" to 2" OD with wall thicknesses of 2.0 mm to 4.0 mm are commonly deployed. The continuous coil configuration allows for the creation of specialized jetting tools with multiple lateral orifice arrangements, enabling 360° coverage of the casing interior. Field experience confirms that the use of seamless stainless steel coil tubes significantly reduces the frequency of tool failures, enhances cleaning efficiency, and ultimately improves the economic performance of well maintenance operations.
Supplier Information
Wenzhou Jixing Metal Materials Co., Ltd. is a leading manufacturer and supplier of stainless steel tubular products based in Wenzhou, Zhejiang Province, China. With extensive industry experience and advanced manufacturing capabilities, the company provides a comprehensive range of stainless steel pipes, tubes, and coil tubes for global markets. The company is committed to delivering high-quality products with reliable technical support and competitive pricing.
- Product Category: Literature & Learning (文献学习)
- Product No.: 1564
- Product Name: Coil Tube (盘管 / Coiltube)
- Application Focus: Sand removal cleaning of large-diameter casings