Api liner hanger

When sourcing liner hangers, you must prioritize API Spec 19LH compliance, which governs the design, functional evaluation, and manufacturing of these tools. Key specs include the burst and collapse pressure ratings, which must exceed the maximum anticipated wellbore pressures. Additionally, verify the hanging capacity (load rating) to ensure it can support the total weight of the liner string with a sufficient safety factor, and check the metallurgy (e.g., 13Cr, L80, or P110) for compatibility with H2S or CO2 environments to prevent stress corrosion cracking.

The choice depends on the well profile. Mechanical liner hangers are typically set by pipe manipulation (rotation or reciprocation) and are cost-effective for vertical or low-deviation wells. However, for highly deviated or horizontal wells where pipe movement is restricted by friction, hydraulic liner hangers are preferred as they are actuated by internal pressure, offering higher reliability in complex geometries.

The integrated packer provides the annular seal between the liner and the previous casing string. For high-pressure/high-temperature (HPHT) wells, you should specify V0-rated gas-tight seals. Ensure the elastomer material (such as HNBR or Viton) is rated for the specific bottom-hole temperature (BHT) and chemical composition of the drilling fluids to prevent seal degradation.

Always request the supplier's API 19LH or API Q1 license number and verify it directly on the API Composite List. Professional buyers should also demand Material Test Reports (MTRs) for all load-bearing components and Non-Destructive Examination (NDE) reports, such as ultrasonic or magnetic particle inspections, to ensure there are no structural flaws in the mandrel or slips.

The biggest risks are non-compliance with local petroleum standards and logistical delays. Ensure the supplier provides a Certificate of Conformity (CoC). To mitigate risk, use Made-in-China.com's inspection services to verify the goods before they leave the factory, ensuring the thread types (e.g., BTC, LTC, or Premium) match your drill pipe exactly.

Liner hangers are critical-path items; a delay can cost thousands in rig time. Negotiate penalties for late delivery in the contract. For shipping, use Sea Freight with specialized wooden crating to prevent thread damage. Ensure the Incoterms are clearly defined—CIF (Cost, Insurance, and Freight) is often preferred for buyers to ensure the supplier handles the complexities of export customs and insurance.

Given the high unit cost of API equipment, utilize Secured Payment services offered by platforms like Made-in-China.com. Avoid direct wire transfers to unverified accounts. Consider a payment structure of 30% deposit and 70% against the Bill of Lading (B/L) after a successful third-party pre-shipment inspection.