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Numerical simulation analysis shows that the optimum

time of water injection is 6 months. With 6 months of

advanced water injection, the reservoir pressure is 7.81

MPa, and 0.51 MPa higher than the initial reservoir pres-

sure. When advanced injection time is more than 6

months, the variation of reservoir pressure is negligible.

6. Conclusions

1) Through advanced water injection, the formation

pressure can be maintained at a high level, high pressure

gradient can be established; the oil flow channel can be

kept open to the maximum extent; the formation damage

can be prevented to some extent and the development

effectiveness of water flooding can be improved.

2) Based on the low-permeability unstable seepage

model, the best advanced water injection time is obtained,

which is consistent with the numerical simulation results,

verifying the correctness of the theoretical model.

3) Advanced water injection can improve the conduc-

tivity capacity of low permeability reservoirs, so as to

increase the production and enhance oil recovery. The

results obtained in this paper should have an important

and guiding significance to the development of low per-

meability reservoirs, and provide a basis to develop other

similar oilfields.

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