Offshore Pipeline Cleaning | Pigging Best Practices | HPHT Flow Assurance
Pipeline cleaning and remediation are essential practices in maintaining the integrity, efficiency, and safety of offshore pipelines, particularly in challenging environments like high-pressure high-temperature (HPHT) fields, deepwater tie-backs, and long subsea lines. Deposits such as wax (paraffin), asphaltenes, scale, hydrates, sand, and corrosion products can reduce flow capacity, accelerate under-deposit corrosion, and lead to blockages […]
Wax Deposition Mitigation in Long HPHT Flow lines: Inhibitor Selection & Thermal Modeling – 2026 Update
By Oko Immanuel, MSc in Subsea Engineering.Published: February 25, 2026 Wax deposition remains one of the most persistent flow assurance threats in long HPHT subsea flowlines (>50 km tie-backs, pressures >10,000 psi, temperatures >150 °C). As fluids cool below the Wax Appearance Temperature (WAT) and Pour Point, paraffin molecules crystallize, adhere to the pipe wall, and build layers […]