Enhanced Oil Recovery ratio of Low Permeability Reservoirs by Pressure-operated Water Injection:A Case Study of Tuoxie 726 Unit in Shengtuo Oilfield
The study on the effective displacement dynamics of pure upper sub-member of Sha 4 in Block 71 of Shengtuo Oilfield can provide theoretical support for the development of turbidite reservoir in Dongying sag.Through the detailed analysis of the formation and actual injection conditions in Tuo 71 area of Shengtuo Oilfield,it is coucluded that the difference between STT726X1 and STT726X2 is mainly affected by the distribution of deep-water gravity flow sandstone.According to the pressure changes and production conditions at the injection end and the production end,we established the effective displacement pressure gradient in this block,and which considered to be 0.037 MPa·m-1.On this basis,the displacement relationship in the formation pores is simulated,and it is found that there are great differences in oil displacement efficiency under different displacement dynamics,and too high displacement dynamics may not have better displacement efficiency.While improving the amount of water injection and liquid production,the best displacement dynamics should also be considered to achieve long-term stable production of the well group.
Shengtuo Oilfieldpure upper sub-member of Sha 4pressure-operated water injectionmicrofractureseffective displacement dynamics
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