The vertical, horizontal, and intra-formation sweeping efficiencies of line drive water flooding are studied by using the methods of testing individual horizons in both production and injection wells, logging for residual oil saturation, pressured coring in check wells and reservoir numerical simulation. The understanding of water encroachment and distribution of residual oil have become the important bases for making adjustment of the oilfield. Both the methods used and our understanding are preliminary, and have to be deepened and verified in production practice.

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