Injected water always advances along the bottom of channel sandstone reservoir with high heterogeneity during development by water injection in vertical well. Even if the time of water-drive is very longer, there is still some non-producing thickness at the top of the oil reservoir, which make an unsatisfactory result of recovery. This paper give an example that horizontal well was drilled in the reservoir of only 4m thick remaining oil by using of existing casing pipe of low efficiency vertical wells to make the top remaining oil reservoir produce. The research shows that drilling horizontal well laterally can improve development result of this kind of reservoirs.

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