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Abstract This paper presents a field-proven methodology that eliminates routine flaring during well testing operations. The objective is to challenge the long-standing industry practice of flaring hydrocarbons during flowback and cleanup phases, and to demonstrate that full test objectives production logging, sampling, cleanup, and data acquisition can be achieved without combustion. The case study is based on a high-H₂S gas condensate well in a remote region of Kazakhstan. To enable flare-free well testing, a novel configuration was deployed combining conventional well test equipment with a portable multiphase boosting system (BoostFlow™), capable of handling variable gas volume fractions (GVF) from 0 to 100%. Produced fluids were routed to a test separator where free water was efficiently removed, while the oil and gas phases were simultaneously pressurized and transported to a remote processing facility. This setup eliminated the need for conventional flare systems and on-site hydrocarbon handling. The operation was performed in a high-H₂S gas condensate reservoir with minimal surface infrastructure, where seamless integration of the booster into the test flowline was essential to ensure stable, controlled flowback and safe pressure management. The operation successfully achieved all standard well testing objectives, including flowback, fluid sampling, and production evaluation, while significantly reducing routine flaring. The integrated multiphase boosting system demonstrated robust performance, maintaining stable operation across a wide range of flow conditions. Notably, the unit sustained continuous operation at 100% gas volume fraction for more than 24 hours, while also delivering consistent performance under low-GVF, liquid-rich conditions. This operational flexibility enabled seamless management of transient flow regimes commonly encountered during well cleanup and test sequences. Successful execution validates the technical feasibility of eliminating flaring from well testing without compromising data integrity or operational objectives. This case provides a proven, scalable model for future applications in sour gas, gas condensate, and remote-field settings, particularly where infrastructure is limited or ESG-driven performance targets are in effect. This paper presents a well testing approach that eliminates routine flaring, challenging long-standing operational norms. Through a first-of-its-kind field application in Kazakhstan, it demonstrates that comprehensive well testing can be performed without combustion. The methodology offers practical value for operators seeking to align with ESG goals and evolving emissions regulations, while maintaining full test integrity in technically demanding, sour gas environments.