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《Petroleum Geology & Oilfield Development in Daqing》 2005-04
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Calculation and Measurement of Pressure Drop of Horizontal of Horizontal Interval Wells in Zhaozhou Oilfield

DONG Chang-yin, et al. (China Petroleum University, Dongying 257061,China)  
The flow in horizontal interval of horizontal wells is characterized by variable mass flow with variable inflow through perforations. In this work, the basic equations of flow pressure gradient in horizontal interval are evolved from the momentum conservation equation. Considering the flow coupling between well bore flow and reservoir filtering flow by variable located fluid productivity index along the horizontal interval, an integrated model for pressure drop in horizontal well bore is established, which concerns the friction factor of perforated pipe with inflow. The pressure loss in horizontal well bore includes frictional loss, acceleration loss, fluid mixing loss and potential energy loss. The model has been used to predict the pressure drop in horizontal well bore of Well Zhou66-61 in Zhaozhou oilfield, and the result of which has a relative discrepancy of 6% comparing to the real tested value. The total pressure loss of these 9 horizontal wells in Zhaozhou field varies from 0.048MPa to 0.26MPa.
【CateGory Index】: TE271
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