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When the horizontal well was acidized, in order to predict the productivity, through coordinate transformation method, based on the formation seepage model of horizontal well after acidification, wededuced the formula of horizontal well local skin factor, established the coupling model of reservoir and horizontal wellbore flow, and deduced the semi-analytical productivity model of horizontal well considering the change of local skin factor. Based on the example, the effect of horizontal well length, reservoir anisotropy coefficient, mud damage depth and damage degree on the production-increasing ratio after acidification were studied. The results showed reservoir with greater anisotropy, serious wellbore pollution and deeper mud invasion near wellbore, and that the stimulation effect of horizontal well after acidification was better.

The Productivity Model of Horizontal Well Considering Acidification Effect in Anisotropic Reservoirs