Modeling the skin factor of horizontal well completed with precision screen

Precision screen completion has good sand control capacity, and is suited for horizontal wells with severe sand production. The flow near the wellbore with precision screen is different from that of ideal well in which it includes the radial flow in the distal formation, the convergent flow in slotted liner of the protective layer, the radial flow in intermediate filter layer, and the convergent flow in the hole of the base-pipe. In this paper, the skin factor model of horizontal well completed with precision screen was built up in consideration of formation damage, and an actual computation was performed with this model. The result shows a little difference between the calculated result and actual data, proving the fitness of the model. Through analyzing the sensitivity of the factors, it was found out that the skin factor was largely affected by parameters of damaged formation, the permeability of the intermediate filter layer, the penetration ratio of slits in the protective layer, the slits around the protective layer, the hole density of the base pipe, and phase angle and borehole radius.