台兴油田 CO2驱细分开发提高采收率技术研究

台兴油田 QK －111断块阜三段油藏为中－低渗复杂断块油藏，经过15 a 水驱开发整体进入高含水递减开发阶段，注气前油藏综合含水74％，采出程度仅14.7％，处于低效开发状态。为恢复断块产量、提高油藏原油采收率，实施 CO2驱现场试验，研究形成了高含水油藏剩余油微差异刻画技术、CO2驱油机理认识、注采参数优化方法以及 CO2驱细分开发技术，已应用于4个注气井组，累计注入 CO2气4.17×104 t，油藏日产油水平由9 t 提高到28 t，综合含水由78％下降到44％，累积增油11183 t，预计方案全面实施后，原油采收率将提高9.6％，年增油量超过1.3×104 t。

EOR research of CO2 flooding and layering technology in Taixing Oilfield

Fault block of QK -111 reservoir with medium -low permeability is located in Taixing Oilfield,whose oil -bearing formations are the third formation of Funing.It has been in the inefficient decreasing development state after 15 years of water flooding,with composite water cut 74% and recovery degree of only 14.7%.CO2 flooding field tests were implemented in order to enhance reservoir oil recovery.Many technologies were applied to this project,which include the study the distribution of remaining oil in high water -cut reservoir,optimization methods of injection and production param-eters,CO2 flooding mechanism study and layering Technology of CO2 flooding technology.The amount of CO2 injection is 4.17 ×104 tons in four gas injector group,oil production per day increased from 9 tons per day to 28 tons per day,com-posite water cut from 78% to 44%,cumulative oil production have increased by 11 183 tons.When the plan is carried out completely,oil recovery will increase by 9.6%,and the amount of oil production will increase more than 1.3 × 104 tons every year.