现代地质
現代地質
현대지질
Geoscience
2015年
4期
950-957
,共8页
CO2 驱%先期注入%段塞尺寸%注气部位%低渗油藏
CO2 驅%先期註入%段塞呎吋%註氣部位%低滲油藏
CO2 구%선기주입%단새척촌%주기부위%저삼유장
CO2 flooding%early injection%slug size%gas injection part%low permeability reservoir
CO2驱是一种能大幅度提高原油采收率的三次采油技术，国内该项技术的研究和应用起步较晚，多以先导试验为主。苏北盆地溱潼凹陷经过10余年的探索，已经在5个低渗油田开展了CO2驱先导试验和推广应用，针对这5个油藏利用一维细管模拟和油藏数值模拟方法开展了注气时机、段塞尺寸和注气部位的研究，并应用典型实例进行了分析，认为先期注入提高混相压力，可更有效地缩短两相区过渡带，增加油相中溶解的CO2含量，降低油相粘度和油气界面张力，进而提高混相程度，更有利于驱油；采用大尺寸段塞可加大CO2波及区域，较好地保持地层能量，从而提高油井见效率，增强驱替效果；高部位注气可有效地抑制重力超覆，减少CO2气体过早地产出和突破的机会。就苏北盆地低渗油藏而言，采用先期注入、大尺寸段塞和高部位注气不失为一种成熟有效的提高采收率方法。
CO2驅是一種能大幅度提高原油採收率的三次採油技術，國內該項技術的研究和應用起步較晚，多以先導試驗為主。囌北盆地溱潼凹陷經過10餘年的探索，已經在5箇低滲油田開展瞭CO2驅先導試驗和推廣應用，針對這5箇油藏利用一維細管模擬和油藏數值模擬方法開展瞭註氣時機、段塞呎吋和註氣部位的研究，併應用典型實例進行瞭分析，認為先期註入提高混相壓力，可更有效地縮短兩相區過渡帶，增加油相中溶解的CO2含量，降低油相粘度和油氣界麵張力，進而提高混相程度，更有利于驅油；採用大呎吋段塞可加大CO2波及區域，較好地保持地層能量，從而提高油井見效率，增彊驅替效果；高部位註氣可有效地抑製重力超覆，減少CO2氣體過早地產齣和突破的機會。就囌北盆地低滲油藏而言，採用先期註入、大呎吋段塞和高部位註氣不失為一種成熟有效的提高採收率方法。
CO2구시일충능대폭도제고원유채수솔적삼차채유기술，국내해항기술적연구화응용기보교만，다이선도시험위주。소북분지진동요함경과10여년적탐색，이경재5개저삼유전개전료CO2구선도시험화추엄응용，침대저5개유장이용일유세관모의화유장수치모의방법개전료주기시궤、단새척촌화주기부위적연구，병응용전형실례진행료분석，인위선기주입제고혼상압력，가경유효지축단량상구과도대，증가유상중용해적CO2함량，강저유상점도화유기계면장력，진이제고혼상정도，경유리우구유；채용대척촌단새가가대CO2파급구역，교호지보지지층능량，종이제고유정견효솔，증강구체효과；고부위주기가유효지억제중력초복，감소CO2기체과조지산출화돌파적궤회。취소북분지저삼유장이언，채용선기주입、대척촌단새화고부위주기불실위일충성숙유효적제고채수솔방법。
As a kind of tertiary oil recovery technology,CO2 flooding can substantially improve the oil recovery ratio which in China started late on its researching and applying,and now is more likely to be sporadic pilot tests.After more than ten years of exploration in Qintong sag,Subei basin,CO2 flooding pilot tests has been conducted and applied in 5 low permeability oil fields.This paper studied the 5 low permeability oil fields with one-dimensional tubule simulation and reservoir numerical simulation,and on this basis,carried out researches of gas injection timing,the slug size,and the gas injection parts.This text stated that improving the miscible pressure in the early injection can more effectively shorten the two phase transition zone,increase the CO2 disso-lution rate,reduce the viscosity of oil phase and interfacial tension of oil and gas,thus,can increase the degree of miscible.In terms of the low permeability reservoir in Subei basin,early injection as well as large size slug can be considered as a mature and effective method to improve oil recovery.
