Abstract: A numerical model of pressurized gathering and transportation model for wet gas field with high sulfur content are established in this paper. The influence of terminal station pressure on slug flow risk, pipe flow velocity and pipe transportation capacity is simulated and analyzed in terms of the thermos-mechanical coupling method. All simulated results show: that the error for reliability of the pressurized gas gathering and transportation mode maintains within 9%. When the gas well distribution keeps unchanged, the lower the total station pressure is, the smaller the liquid holding rate of the pipe is. The decrease of the pipe network operating pressure is conducive to avoid the formation of slug flow in the later stage of exploitation. When the total station pressure is 5.0 MPa, some pipe sections, namely 1^#, 3^# and 4^#, have flow rate of too high, which exceeds predetermined design requirements. Therefore, the corresponding pipe sections need to be pressurized for gathering and transportation to reach the safety value. When the gathering and transportation pipe network meets the transportation capacity of 9 billion square / year, the operation pressure of the main station shall not be lower than 6.9 MPa. It is determined that the critical condition for pressurized operation of high sulfur wet gas gathering and transportation system is not to be lower than 7.0 MPa.

Key words: pressurized gathering and transportation, high sulfur moisture, critical condition