Abstract: Viscoelastic surfactants(VES)technology has been widely utilized in fracturing and acid treatment of carbonate reservoir and acid treatment of sandstone.A new viscoelastic surfactant(sinapic amido propyl betaine,SAP-BET)was synthesized.The SAP-BET belongs to amphoteric viscoelastic surfactant with a long water-repellent carbon chain,so the formulation fluid of SAP-BET has favorable viscoelastic behavior.The SAP-BET could be used to develop self-diverting VES acid and non-polymer fracturing fluid.The sandstone diversion acidization technology of VES micelle fluid was developed according to the viscous skin coefficient.This technology is suitable for diversion acidization of high temperature heterogeneous multiple-layer sandstone reservoir.