Hypersalinity-resistant and condensate-oil-resistant foam scrubbing agent and preparation method thereof

The invention belongs to the field of oil and gas field development, and particularly relates to a hypersalinity-resistant and condensate-oil-resistant foam scrubbing agent adopted in natural gas extraction and a preparation method of the hypersalinity-resistant and condensate-oil-resistant foam scrubbing agent. The hypersalinity-resistant and condensate-oil-resistant foam scrubbing agent is prepared from the following ingredients in percentage by mass: 0.3 to 1.2% of alkyl sulfonate betaine, 0.1 to 0.8% of organic nanometer particles, 1 to 35% of an inorganic salt and the balance of water. Afoam scrubbing agent system disclosed by the invention has relatively high foaming volume and liquid carrying capacity under the conditions of 35% ultra-high salinity and in the presence of condensateoil, and can be used for foam drainage gas recovery of gas wells with ultra-high salinity and condensate oil; the preparation process of the foam scrubbing agent is simple, low in cost and beneficialto large-area popularizati