The onsitu sulfur removal effect is quite different from the indoor
static evaluation of sulfur removal agent. For the indoor static evaluation of sulfur removal agent, the sampling is inaccurate, the static
evaluation sulfur removal efficiency of the sulfur removal agent is lower than the actual situation, and the sulfide concentration is easily
interfered as the result of the experimental measurement index. Based on the circulation process of drilling and completion fluids, controlling
fluids and other working fluids in the actual wellbore, a physical simulation model with a liquid volume of 65 L is designed. The working fluid is
simulated in the wellbore device with a flow rate of 0～1 m3/h. The flow form of the agent can simulate a mixed gas with a production pressure
of 005～050 MPa in a vertical well, an inclined well or a horizontal well. A preferred method for measuring the H2S concentration of the
simulated wellhead is selected as a measurement index to calculate measurement result. The sulfur removal efficiency of the sulfur removal agent
was calculated by recording the simulated wellhead H2S gas concentration curve. The indoor evaluation results show that the monitoring results
of the dynamic evaluation device are intuitive, and the accuracy and repeatability of the sulfur removal effect evaluation of the sulfur removal
agent are improved. The evaluation results are authentic and can provide guidance for the addition of sulfur removal agents for onsite
operations.