Technologies and practice of CO2 flooding and sequestration in China

HU Yongle,HAO Mingqiang,CHEN Guoli,SUN Ruiyan,LI Shi

Table 3 Evaluation criteria for CO2 flooding development effect.

Evaluation indicator Evaluation criteria Remark Increase amplitude of production/% >100 50-100 30-50 <30 Excellent Good Moderate Poor Comparison with water flooding Increase amplitude of recovery/% >15 10-15 5-10 <5 Excellent Good Moderate Poor Comparison with water flooding Increase of oil production by injecting one ton of gas/(t·t-1) >0.50 0.25-0.50 <0.25 High Moderate Low Generally also known as oil displacement rate Gas sequestration rate/% >65 35-65 <35 High Moderate Low Generally also known as sequestration rate Internal rate of return/% >24 18-24 12-18 <12 Excellent Good Moderate Poor Compared to company's benchmark benefit rate