摘要
注N_(2)提高采收率是目前世界范围内较为先进的提高采收率的方法。该文针对某油田区块进行注N_(2)提高采收率研究,通过数值模拟方法来优选最佳的注采方案。运用CMG数值模拟软件中的组分模型GEM来评价注N_(2)的最佳注入压力、最佳注入量、最佳注入速度、最佳注采比和最佳气水交替周期,基于此,得到最佳的注N_(2)驱方案。研究结果表明:1)S低渗油藏最佳的注N_(2)方案为注入压力为50 MPa,注入量为0.8 HCPV,注采比为1.3,注入方式为N_(2)-水交替注入,交替周期为2个月;2)注入压力越高,注入速度越大,注N_(2)气窜越严重,原油采收率提高效果差;3)注入压力为50 MPa,注入速度为10×104 m3/d,注采比为1.3,气水交替周期为2个月,注入量达到0.8 HCPV时转为衰竭开发。当地层压力下降到15 MPa时,N_(2)将会发生严重气窜,表明N_(2)-水交替注入并未达到有效控水的目的。以上优选最佳注入方案可提高油藏采收率,相对于衰竭提高采收率9.6%。
At present, enhanced N_(2) recovery is a more advanced method to improve recovery. In this paper, the improved recovery rate of N_(2) injection in a block of oil field is predicted by numerical simulation analysis. Using the numerical simulation technology in this paper. Using CMG software to calculate the best injection pressure, injection rate of N_(2) injection, best injection rate, best injection-production ratio and the best gas water exchange period to get the best note N_(2) flooding plan. The results show that: 1) The optimal N_(2) injection scheme for S low permeability reservoir is as follows: injection pressure is 50 MPa, injection volume is 0.8 HCPV, injection/production ratio is 1.3, and the injection method is N_(2)-water alternate injection, alternating cycle is two months. 2) The higher the injection pressure, the higher the injection speed, the more serious the N_(2) gas channeling, and the poor oil recovery effect. 3) The injection pressure was 50 MPa, the injection rate was 10×104 m3/d, the injection/production ratio was 1.3, the gas-water alternating period was two months, and the development was turned into exhaustion when the injection volume reached 0.8 HCPV.When the local layer pressure drops to 15 MPa, serious N_(2) gas channeling will occur, indicating that alternate N_(2)-water injection has not achieved the purpose of effective water control.The above optimal injection scheme resulted in a 9.6% increase in reservoir recovery compared to depletion.
作者
韩鑫
黄思婧
余洋阳
顾康福
赵锐
侯大力
HAN Xin;HUANG Sijing;YU Yangyang;GU Kangfu;ZHAO Rui;HOU Dali(College of Energy,Chengdu University of Technology,Chengdu 610059,China)
出处
《非常规油气》
2021年第5期63-69,共7页
Unconventional Oil & Gas
基金
四川省科技计划项目“储层条件超临界CO_(2)压裂液-页岩气-页岩多相相互作用复杂机理研究”(2021YJ0352)。
关键词
N_(2)驱
提高采收率
油藏数值模拟
N_(2)flooding
enhanced recovery
numerical reservoir simulation
