Foam drainage agent

The invention discloses a foam drainage agent. The foam drainage agent is prepared from the following components by weight: 25%-50% of cocoamidopropyl betaine, 10%-25% of sulfonated fatty alcohol polyoxyethylene ether, 3%-7% of cocamido hydroxysulfobetaine, 1%-5% of methyl cellulose and the balance of water. The foam drainage agent has high self-foaming capacity, good foam stability and high liquid carrying capacity, has anti-mineralization capacity of 250 g/L or higher and gas condensate resistance capacity of 30% or higher, has good compatibility, is not subjected to reaction with gas-liquidcomponents in a wellbore, has low toxicity, is easy to degrade and does not corrode equipment or pipes. 本发明公开了一种泡沫排水剂。泡沫排水剂由以下组分组成：25％-50％重量份的椰油基酰胺丙基甜菜碱、10％-25％重量份的磺化的脂肪醇聚氧乙烯醚、3％-7％重量份的椰油酰胺羟磺基甜菜碱、1％-5％重量份的甲基纤维素以及余量的水。本发明的泡沫排水剂的自发泡能力强，泡沫稳定性好，携液能力强，抗矿化度能力在250g/L以上，抗凝析油能力在30％以上，并且配伍性好，与井筒内的气液组分不发生反应，毒性低易降解，不腐蚀设备和管道。