Abstract
Interlayer has obvious effect on restraining the bottom water coning, but it's still a blank for the study of interlayer models. Aimed at this question, a study was conducted on the effect of interlayer that could be classified into four models: barren interlayer, permeable interlayer, small-scope impermeable interlayer, and large-scope impermeable interlayer. A mass of remaining oil accumulated far from the wellbore due to the rapid water coning could be recovered by means of improvement of well pattern under the condition of no interlayer developed in the formation. If permeable interlayer were developed in the reservoir, there would be just a small amount of remaining oil underground, because bottom water could be transformed into secondary edge water and secondary bottom water caused by interlayer, which led to better development result of interlayer. Small-scope impermeable interlayer could transform bottom water to secondary edge water, which would lead to the formation of eave oil and roof oil accumulated under and above the interlayer, respectively. Large-scope impermeable interlayer could restrain utterly the bottom water coning, which would lead to the accumulation of substantial remaining oil in the adjacent layers. Those remaining oil would be the key target for the late-stage potential tapping.
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