关停湿气压缩机对外输天然气组成的影响及改造方案

莺歌海盆地东方1-1气田是我国海上最大的自营气田，日产天然气800×10⁴ m³，共32口气井，每口气井CO₂含量差异较大，当湿气压缩机关停后由于压差的变化会造成外输天然气组成的波动而影响下游用户的生产稳定性。为此，对设备及工艺流程进行了优化改造，增加了压缩机意外关停触发中心平台高碳井自动关井逻辑，增设了自动油嘴，并在生产分离器增设了PV阀遥控放空。优化改造后，气田经历过多次压缩机意外关停，都顺利将天然气组分CO₂的含量波动幅度控制在8%以内，使得工艺系统更加稳定，对下游用户的冲击也降到了最低，每年创造近600万元的经济效益。

Impact of wet compressor shutdown on the component of pipeline natural gas and modification schemes

The Dongfang 1-1 Gas Field in the Yinggehai Basin is China’s largest independently operated offshore gas field with 32 gas wells and daily gas output of 8000 thousand m3.The CO2 contents of different gas wells vary greatly.When the wet compressor is shut down,the pipeline gas components will fluctuate due to the changes in pressure difference,accordingly the industrial production of downstream gas users will be badly affected.Therefore,the facilities and process are first optimized and modified.The high-carbon well automatic shut-in logic for the unexpected shutdown of compressor is then added at the trigger center platform,and the automatic nozzle is equipped as well.Besides,the remote control venting of a PV valve for the production separator is also established.After the above measures are taken,this gas field has experienced several times of compressor shutdown but the content fluctuation degree of CO2 has been successfully controlled to be less than 8%,which not only makes the process system more stable,but minimizes the impact on downstream users and creates nearly RMB 6 million Yuan in economic benefits each year.