Overview
Follow-up casing is a tubular structure inserted into drilled boreholes to maintain stability and prevent collapse. Commonly used in oil/gas extraction and geothermal wells, it serves as a permanent or temporary barrier against formation pressure and fluid migration. Designed to withstand harsh downhole conditions, its specifications (e.g., diameter, wall thickness) align with API 5CT/ISO 11960 standards. Threaded couplings ensure secure connections between segments during installation.
Structure and Working Principle
The casing comprises cylindrical steel pipes with threaded ends for sequential joining. Internal coatings (e.g., epoxy, zinc) may enhance corrosion resistance in acidic or saline environments. During installation, segments are lowered into the borehole and cemented into place. The system isolates unstable formations while allowing drilling tools to pass through, enabling deeper excavation without compromising well integrity.
Key Features
High tensile strength (yield strength ≥ 55,000 psi for Grade J-55) accommodates subsurface stresses. Thick-walled variants resist deformation in high-pressure zones. Corrosion-resistant alloys (e.g., 13Cr, duplex steel) extend lifespan in sour gas wells. Precision threading (e.g., BTC, LTC) ensures leak-proof connections under dynamic loads.
Application Areas
Oil/gas wells: Primary use for zonal isolation and blowout prevention. Geothermal projects: Withstands thermal cycling and mineral-rich fluids. Water wells: Prevents aquifer contamination. Mining: Supports unstable shafts during excavation. Construction: Stabilizes foundation pilings in loose soils.
Maintenance and Precautions
Pre-installation: Inspect for thread damage; store horizontally to prevent warping. During use: Monitor for buckling or cement sheath failures via downhole cameras. Post-installation: Conduct pressure tests to verify seal integrity. Avoid abrasive cleaning methods that compromise protective coatings.
B2B Procurement Guide
Supplier vetting: Prioritize manufacturers with API Monogram certification. Request mill test reports for material traceability. Cost factors: Alloy content, non-destructive testing (NDT) requirements, and logistics (e.g., pre-cut lengths reduce field welding). Bulk orders (20+ tons) typically attract 5–15% discounts.
Related Manufacturers
- 主营：[]
- 主营：直缝钢管、防腐钢管、直缝焊接钢管、直埋保温钢管、发泡保温钢管、蒸汽保温钢管、大口径直缝焊管
- 主营：小导管、无缝管、注浆管、棚套管、地质套管、注浆套管、地质钻探套管、钢花管、管棚管、声测管、注浆跟管、管棚根管、跟管管靴、锚杆钢管、地质跟管、无缝钢管、钢花钢管、倒刺钢锚管、公母丝钢管、车内丝跟管、隧道地质管、桥式滤水管、边坡支护管、注浆用钢管、地铁降水井管
- 主营：岩心管、管棚管、桥梁管、地质套管、钢花管、小导管、土钉管、尖丝管、注浆管、根管管、108跟管、780钢管、缩尖管、127跟管、168跟管、地质管、跟管r780、r780地质、R780跟管、地质钻探钻具、地质钻杆、R780管靴、隧道管棚跟管
- 主营：管棚管、滤水管、注浆管、跟进套管、钻探套管、套管、地质套管、隧道钢花管、无缝管棚管、超前小导管、注浆钢管、地质管、管靴、根管、跟管、岩心管、锚索跟管、无缝钢花管、注浆管棚管
- 主营：注浆管、钢花管、超前小导管、跟管
- 主营：146跟管、127跟管、岩芯管、108套管、止水套管、地质套管、套管接头、102钻杆、112钻杆、泥浆泵、螺旋钻杆、自由落锤、水井钻机、xy-100钻机、岩心钻机、水井钻杆、探水钻杆、无缝钢管、42打捞钻杆、50地质钻杆、60地质钻杆、50防英钻杆、73刻槽钻杆、73肋骨钻杆、89潜孔钻杆
- 主营：吹氧管、注浆管、岩心管、注浆钢花管、抗拉耐酸洗定尺
- 主营：R780跟进套管管靴、消磁钢管、非磁性钢管
- 主营：矿山机械设备
- 主营：全套管、套管接头、全护筒接头
- 主营：超前小导管、钢花管、地质跟管、桥式滤水管、降水井管
- 主营：旋挖钻具、捞沙斗、两半斗、跟进护筒、全套管、护筒、旋挖配件、筒钻、筒钻截齿、螺旋钻斗、螺旋锥
- 主营：30mn20al3、合金管、无缝管、DZ40跟进套管、船用iii、360钢管、精密管、方矩管、耐压管、工字钢、q235槽钢、ccsa钢板、65mn钢板、q355槽钢、20cr冷拔、号绗磨管、热轧无缝、精密钢管、直缝钢管、高锰圆钢、哈氏合金、低温圆钢、焊接钢管、熔喷模具、无缝钢管、不锈钢管
- 主营：桥式滤水管、滤水管、井壁管、跟进套管、降水井管、扬水管、岩心管、钢花管、管棚管、隧道无缝钢管、钢管加工、超前小导管、钢花管土钉、方矩管、无缝方管、超前大管棚
- 主营：声测管、注浆管、沉降板、观测标