Multi-effect additive for natural gas exploitation as well as preparation method and application of multi-effect additive

The invention provides a multi-effect additive for natural gas exploitation as well as a preparation method and application of the multi-effect additive. The multi-effect additive comprises the following components in parts by weight: 1-3 parts of a plant chelating agent, 1-5 parts of an ethylene-vinyl acetate copolymer, 15-40 parts of alkyl glycoside, 5-15 parts of formate, 5-25 parts of solvent oil and 12-73 parts of water. The multi-effect additive provided by the invention can significantly reduce the dosage of hydrate thermodynamic inhibitors such as methanol, and can effectively inhibit the formation of natural gas hydrates and relieve the problems of paraffin deposition, pipeline corrosion, scaling and the like. 本发明提供一种天然气开采用多效添加剂及其制备方法和应用，所述多效添加剂含有如下组分：1-3重量份的植物性螯合剂、1-5重量份的乙烯-醋酸乙烯酯共聚物、15-40重量份的烷基糖苷、5-15重量份的蚁酸盐、5-25重量份的溶剂油和12-73重量份的水。本发明的多效添加剂可以显著降低甲醇等水合物热力学抑制剂的用量，并且能够有效抑制天然气水合物的形成以及缓解石蜡沉积、管道腐蚀和结垢等问题。