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The vertical, horizontal, and intra-formation sweeping efficiencies of line drive water flooding are studied by using the methods of testing individualhorizons in both production and injection wells, logging for residual oilsaturation, 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 oil field. Both the methods used and our understanding are preliminary, and have to be deepened and verified in production practice. Introduction It is shown by the practice in Daqing and Karamai oilfields that line drive water flooding with small spacing has achieve good development results in oil fields, with well-communicated reservoirs, large oil-bearing areas, relatively unbroken structures, medium to high permeabilities and less active edge water.

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