A Multifunctional Foam Drainage Agent With Liquid Lock Release and Anti‐Corrosion in Natural Gas Production

The concurrent challenges of liquid lock damage and wellbore corrosion in natural gas extraction severely impair productivity and well integrity, yet conventional sequential treatments with single‐function chemicals suffer from limited reservoir penetration and poor synergy. This study develops an integrated multifunctional agent (YTLN) that unifies foam drainage, deep liquid lock release, and corrosion inhibition within a single formulation. The optimized design, consisting of perfluoropolyether‐based YM‐313, alkylphenol polyoxyethylene ether (TX‐10), laurylamidopropyl betaine (LAB), and hydrazine hydrate at a mass ratio of 3:5:8:1 and a total concentration of 0.85%, achieves an ultralow surface tension of 17.6 mN/m at 70°C with a critical micelle concentration of only 0.006%. The agent delivers a foam volume of 495 mL and a half‐life of 9.3 min, maintains robust performance up to 50°C and 12.5% NaCl salinity, and exhibits excellent resistance to methanol and condensate oil. Electrochemical analysis reveals a corrosion inhibition efficiency exceeding 90% via an anodic protection mechanism, while core flooding experiments demonstrate a 56% restoration of gas permeability and a reduction of water saturation to 40%, confirming effective liquid lock mitigation. Collectively, the YTLN agent offers a cost‐effective, operationally streamlined, and sustainable solution for gas field development under medium‐temperature and medium‐salinity conditions, with strong industrial applicability. The co‐occurrence of liquid lock damage and wellbore corrosion represents a critical challenge compromising productivity and integrity in natural gas extraction. Traditional sequential treatments employing single‐function chemicals demonstrate limited efficacy and compatibility risks. This study proposes an innovative integrated chemical agent (YTLN) that synergistically combines foam drainage, corrosion inhibition, and liquid lock release functionalities. The formulation employs perfluoropolyether‐based YM‐313 as the primary surfactant, optimized with alkylphenol polyoxyethylene ether (TX‐10) and laurylamidopropyl betaine (LAB) as co‐foaming agents, supplemented with hydrazine hydrate as a corrosion inhibitor. Experimental characterization reveals exceptional performance metrics: the agent achieves ultralow surface tension of 17.6 mN/m at 70°C with a critical micelle concentration of 0.006%, while maintaining stable interfacial tension over 10 d. The optimized formulation (YM‐313:TX‐10:LAB at 3:5:8 ratio, plus 400 mg/L hydrazine hydrate) delivers a foam volume of 495 mL with 9.3 min half‐life, demonstrating robust temperature resistance up to 50°C and salt tolerance against 12.5% NaCl. Electrochemical analysis confirms effective corrosion inhibition exceeding 90% at 0.85% concentration through anodic protection mechanisms. Core flooding experiments validate significant liquid lock mitigation, reducing water saturation to 40% and restoring permeability by 56%. This multifunctional paradigm streamlines field operations, reduces chemical consumption, and provides a cost‐effective technical solution for sustainable gas field development under medium‐temperature and medium‐salinity conditions, offering substantial industrial application prospects.