CAJ | 학술논문

通过对 X 区块原始地层流体的相态分析，确定了该区块为近临界凝析气藏。该区块一直采用衰竭式开采方式，气藏原始地层压力为27 MPa，自开采以来至2012年8月地层压力下降为10 MPa，已低于露点压力，反凝析加剧，地层污染加重，并造成大量的凝析油损失。利用该凝析气田附近所具有的高纯 CO2气藏气，探索注 CO2气开发方式改善和提高凝析油气的采收率具有技术进步意义。通过对 CO2和 N2两种注入气与地层流体膨胀实验数据的对比研究，得到 CO2与地层流体的增溶膨胀能力、混相能力等相态配伍性较好且优于 N2。在 CO2与目前地层凝析油混相能力研究中发现在19.3 MPa 下 CO2能与目前凝析油达到混相，CO2与目前地层凝析油容易达到混相，故开采时只要通过先期注 CO2把目前地层压力提高至19.3 MPa 以上，就可实现混相驱提高凝析油的采收率。
통과대 X 구괴원시지층류체적상태분석，학정료해구괴위근림계응석기장。해구괴일직채용쇠갈식개채방식，기장원시지층압력위27 MPa，자개채이래지2012년8월지층압력하강위10 MPa，이저우로점압력，반응석가극，지층오염가중，병조성대량적응석유손실。이용해응석기전부근소구유적고순 CO2기장기，탐색주 CO2기개발방식개선화제고응석유기적채수솔구유기술진보의의。통과대 CO2화 N2량충주입기여지층류체팽창실험수거적대비연구，득도 CO2여지층류체적증용팽창능력、혼상능력등상태배오성교호차우우 N2。재 CO2여목전지층응석유혼상능력연구중발현재19.3 MPa 하 CO2능여목전응석유체도혼상，CO2여목전지층응석유용역체도혼상，고개채시지요통과선기주 CO2파목전지층압력제고지19.3 MPa 이상，취가실현혼상구제고응석유적채수솔。
According to phase analysis of initial reservoir fluid collected from block X,it is confirmed that reservoirs in the block are near -critical condensate gas reservoirs.Depletion development is always used in the block.By the end of August 2012,the formation pressure decreased from initial reservoir pressure of 27 MPa to 10 MPa which is lower than dew point pressure.This condition results in increasing retrograde condensation and formation pollution,and loss of condensate oil.Therefore,it is necessary to enhance condensate oil recovery by using high -purity CO2 from gas reservoir in the vicini-ty of the block.By compared with CO2 and N2 swelling experiments,the capability of solubilization and swelling of CO2 is better than that of N2 ,and CO2 is easier to mix with formation fluid.For the target condensate oil,CO2 minimum miscible pressure is 19.3 MPa.Therefore,as long as the present formation pressure is increased to more than 19.3MPa by CO2 in-jection,CO2 miscible flooding can be reached to enhance condensate oil recovery.