富气的相态特性及其工程意义

分析了富气组成对富气的相态特征参量的影响 ,指出C3、C4 含量低的富气经过严格的脱油处理可以在传统压力下单相输送 ;适度控制凝析油含量 ,一般富气可以实现密相输送。两相输送对富气的烃露点没有具体的要求 ,但是通过脱油处理可以降低两相输送管道的积液量

Phase Behavior Characteristics of Rich Gases and Their Engineering Significances

For the rich gas transmission schemes, extraction of NGL from the natural gas is not required in the oilfield or gas condensate field, so the gas treatment processes in the field is simplified and the expense from the storage and transportation of NGL is saved. Rich gas can be transported in single phase under conven- tional pressure, dense phase, or two-phase. The phase envelopes of typical rich gases are calculated to investigate the effect of the composition of rich gases on the characteristics of phase behavior. Only the rich gas with low contents of C 3 and C 4, and with the strict condensate removal, could go a long distance in single phase under conventional pressure. The dense phase alternative may have a requirement for moderate removal of condensate from the gas for the sake of cricondenbar. In most cases,the hydrocarbon dew point is not specified for the two-phase transmission of rich gas, but condensate removal could lower the volume content of liquid accumulated in the pipeline. Dense phase or two-phase alternative is a common selection for the rich gas.