CAJ | 학술논문

针对延长油田乔家洼区块由于基质致密和非均质性严重造成注水开发效果差的问题，通过开展CO2室内驱油实验，在水驱基础上分别对连续气驱和气水交替驱驱油潜力进行评价，并对气水交替驱流体注入速度、段塞尺寸及气水比等注入参数进行优化。同时，对区块采用水驱、优化井网后水驱、利用优化的CO2驱注入参数开展气驱和注气5年后转气水交替驱4种开发方案，进行数值模拟产量预测。实验结果表明，CO2驱在目标区块高含水后有着较大驱油潜力，连续气驱和气水交替驱分别在水驱基础上可提高采收率8．43％和20．95％；气水交替注入方式下采收率随各注入参数的增大均呈先增加后降低的趋势，最佳注入速度、最佳注入段塞尺寸和最佳气水比分别为0．73 mL／min、0．1 PV和1∶1。数值模拟结果表明：优化井网后水驱、连续气驱和注气5年后转气水交替驱3种方案在开发15年后，分别可以在原水驱方案基础上提高采收率0．77％、13．81％和12．98％，建议采用注气5年后转气水交替驱方案进行生产。
침대연장유전교가와구괴유우기질치밀화비균질성엄중조성주수개발효과차적문제，통과개전CO2실내구유실험，재수구기출상분별대련속기구화기수교체구구유잠력진행평개，병대기수교체구류체주입속도、단새척촌급기수비등주입삼수진행우화。동시，대구괴채용수구、우화정망후수구、이용우화적CO2구주입삼수개전기구화주기5년후전기수교체구4충개발방안，진행수치모의산량예측。실험결과표명，CO2구재목표구괴고함수후유착교대구유잠력，련속기구화기수교체구분별재수구기출상가제고채수솔8．43％화20．95％；기수교체주입방식하채수솔수각주입삼수적증대균정선증가후강저적추세，최가주입속도、최가주입단새척촌화최가기수비분별위0．73 mL／min、0．1 PV화1∶1。수치모의결과표명：우화정망후수구、련속기구화주기5년후전기수교체구3충방안재개발15년후，분별가이재원수구방안기출상제고채수솔0．77％、13．81％화12．98％，건의채용주기5년후전기수교체구방안진행생산。
Due to dense matrix and serious heterogeneity ,the water flooding development effect is poor in Qiaojiaowa block ,Yanchang Oilfield .Therefore ,CO2 indoor flooding experiment is carried out to potentially evaluate CO2 flooding and water alternating gas (WAG) on the basis of water flood‐ing ,and optimize the injection parameters such as injecting velocity ,slug size and the ratio of gas and water .Besides ,yield predictions of water flooding ,water flooding based on well optimized ,CO2 flooding and WAG after injection CO 2 for 5 years are conducted using numerical simulation .Experi‐mental results show that it is a large potential in target block for CO 2 flooding after water flooding . The enhanced oil recovery (EOR) improvement of CO2 flooding and WAG are 8 .43% and 20 .95% re‐spectively compared with water flooding .Oil recovery with WAG increases first and then decreases with three injection parameters increase .The best injected velocity ,slug size and gas‐water ratio are 0 .73 mL/min ,0 .1 PV and 1∶1 .Simulation results show that the EOR improvement of water flood‐ing based on well optimized ,CO2 flooding and WAG after injecting CO2 for five years after developing 15 years are 0 .77% ,13 .81% and 12 .98% respectively compared with water flooding .The suggested production plan is WAG after injecting CO 2 for five years .