Aiming at the unclear reorganization of the water cone shape and its flooding scope for a horizontal well in a heavy oil reservoir with bottom water, a new method was proposed in this paper to establish a numerical model with the starting pressure gradient (SPG) by commercial software to study water cone behavior. The results show that there exists SPG in heavy oil reservoirs ranging from 10~(–4) to 10~(–3) magnitude with mobility under 30 μm~(2)/mPa·s. With a mobility of 33 μm~(2)/mPa·s, the water cone and flooding scope from the model with SPG is 120 m shorter than that without SPG. Upon increasing the mobility from 11 to 90 μm~(2)/mPa·s, the flooding scope of the model with SPG changes from 125 to 315 m, showing a power exponential form. The new method proposed in this paper was significant for the water cone behavior study and has broad applications in heavy oil reservoir development in the future.
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