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中国大庆喇萨杏油田伴生气甲烷含量为 73.4 %～ 88.1% ,采用氨制冷和丙烷制冷的 10套浅冷装置回收C3 + 轻烃组分 ,制冷深度为 - 2 0～ - 35℃ ,丙烷收率为 18.2 %～ 4 7.1% ,C2 + 组分的回收率只有 5 2 .72 % ,轻烃资源回收率低。在对大庆油田伴生气冷凝规律研究的基础上 ,提出了浅冷—油吸收复合轻烃回收工艺 ,并在萨中30× 10 4m3 /d浅冷装置上进行了现场试验研究。结果表明 ,浅冷—油吸收复合轻烃回收工艺丙烷收率可达到 6 1%～ 85 % ,比氨制冷、丙烷制冷回收工艺提高 30～ 5 5个百分点 ,轻烃收率可提高 30 %～ 5 0 %。浅冷—油吸收复合轻烃回收工艺装置的试验成功 ,为我国油田伴生气轻烃回收提供了新的工艺路线 ,特别适合于丙烷收率低于 6 0 %的轻烃回收装置改造和新建装置的工艺设计。

Combined Technology of Light Hydrocarbon Recovery by Gas Shallow Cooling-Oil Absorption

??The methane content of accompanying gas of Lasaxing oil field is 73.4%??88.1% in Daquing,China.Using 10 sets of shallow cooling facilities with ammonia refrigeration and propane refrigeration to recover C₃⁺ light hydrocarbon components,the refrigeration depth is -20??-35??,the propane recovering rate is 18.2%??47.1%,and the recovering rate of the C₂⁺ components is only 52.72%.So,the recovering rate of light hydrocarbon resource is low.Based on the investigation if the condensation law of the companying gas in Daqing oil field,the combined technology of light hydrocarbon recovery by shallow cooling??oil absorption is developed,and tested at Sazhong shallow cooling facility of 30×10⁴m³/d in the field.The testing results indicate the propane recovering rate can reach to 61%??85% with the combined technology of light hydrocarbon recovery by shallow cooling??oil absorption,30%??55% higher than that with the recovering technology of ammonia refrigeration and propane refrigeration,and 30%??50% higher for light hydrocarbon recovering rate.Since the combined technology of light hydrocarbon recovery by shallow cooling??oil absorption is tested successfully,it provides a new way for light hydrocarbon recovery of companying gas in China.It is particularly suitable for the rehabilitation of light hydrocarbon recovering facilities with propane recovering rate less than 60%,and for process design of new facilities.