高酸高压油气FPSO处理工艺及关键设备设计

High Acid High Pressure Oil and Gas FPSO Processing Technology and Key Equipment Design

以巴西某油田大型超深水石油开发FPSO为研究对象,以该油田实际产能,日生产原油18万桶、伴生气1200万m 3为设计目标。针对采出液高酸高压且含盐等特点,并结合外输油气标准等,设计研究该油田开采方式、FPSO处理工艺、设备计算,以满足该油田工艺设计理念。基于减碳思想,提出水气交替注入开采方式,设计海底高压分离模块及上层膜分离模块,将CO_(2)分离、回注、封存地层,并减轻上部模块处理负荷。采出液经上部模块分离、稳定、蒸气回收、压缩、脱液、脱酸、净化处理,达到相应含水量、含油率、压力等标准后,稳定原油被计量、外输;水排海或回注地层;伴生气则用作燃料气、回注气及气举气。经研究,该工艺设计结合安全性、模块化、碳封存、余热利用等于一体,可为未来国内高酸油气田的开采、处理提供借鉴。

The paper takes a large ultra-deepwater oil development FPSO in a Brazilian oil field as the research object.Based on the actual production capacity of the oil field,the daily production of 180,000 barrels of oil and 12 million cubic meters of gas is designed.According to the characteristics of high acid,high pressure and salt content of the produced fluid,combined with the standards of oil and gas export,the exploitation mode,FPSO processing technology and equipment calculation of the oilfield were designed and studied,to meet the process design concept of the oilfield.Based on the idea of carbon reduction,an alternate injection mining method of water and gas is proposed,and a subsea high-pressure separation module and an upper membrane separation module are designed to separate,re-inject and store CO_(2) into the strata,and reduce the processing load of the topside module.The produced liquid is separated,stabilized,vapor recovery,compressed,dehydrated,deacidified and purified by the topside module.After reaching the corresponding water content,oil content and pressure standards,the stable crude oil is measured and exported.Water discharge into the sea or re-injection into the strata;Associated gas is used as fuel gas,reinjection gas and gas lift gas.Through research,the process design is integrated with safety,modularity,carbon storage and waste heat utilization,which can provide reference for the exploitation and treatment of high acid oil and gas fields in China in the future.