| Due to the characteristics of the low and extra low permeability reservior,,there exsits many problems using the conventional water flooding,for example,the response is bad,the production is low,the recovery ratio is low,the cost is high.Therefore,the development of low permeability has become the major problems at home and abroad.In recent years,the CO2-EOR technology has gained great development,this technology is not only fit for conventional reservoir,but also fit for the low and extra low permeability reservoir,which can enhance oil recovery obviously,in this paper,the following works were achieved1.Summed up in detail the character of CO2 and then analysis the mechanism of oil displacement.the concept geological model of Jilin Hei 79 block was established,the influcing factors including reservoir parameters,fluid parameters and flooding parameters were researched by using the numerical modeling and confirm the influence trend of different kinds of influcing factors.2.The geologic model of Daqing Putaohua oil layer,Daqing Fuyu oil layer and Changqing Chang 1 oil layer were established by using the Petrel software,the typical well groups were selected for the CO2 flooding experiment;The MMP of this three blocks were established by moding the slime tube test and then optimize the injecting method,the flood pattern,the WAG time and production BHP and find the technical limits.3.Summed up in detail a set of research methods of calculating economical limits,the economic evaluation of this three blocks were calculated based on the technical limits,the net cash flow of this three blocks were calculated and then compared with the water flooding so as to determine feasibility of the CO2 flooding.4.A set of complete index system which is suitable for the low pereability of our country is estabilished by investigating the reservoir quality and technical limits of other CO2 flooding blocks and this three blocks. |
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