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《Journal of Oil and Gas Technology》 2007-02
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A Model for Calculating the Borehole Pressure Drop for Variable Perforation Density and Segmental Perforation in Horizontal Wells

WANG Shu-ping,LI Zhi-ping,HUANG Zhi-wen,ZOU Cun-you(China University of Geosciences,Beijing 100083)SHI Wei(Petroleum Industry Press,Beijing 100011)  
Perforation is one of the major means of horizontal well perforation.Because the fluid flowing in the wellbore is variable mass flow,pressure loss would be caused by borehole flowing,which includes friction pressure loss,acceleration pressure loss and mixed pressure loss.Based on the knowledge related with the filtration theory and fluid mechanics,the concept of variable perforation density and segmental perforation is proposed in consideration of the coupling of formation fluid with borehole fluid and field demands.A model is established for calculating borehole pressure drop for variable perforation density and segmental perforation in horizontal wells and the influence of perforation density variation on pressure drop in horizontal wells is analyzed.A theoretical basis is provided for calculating the pressure drop in the new horizontal well completion.
【CateGory Index】: TE257
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